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

Version: ~ [ linux-5.6-rc3 ] ~ [ linux-5.5.6 ] ~ [ linux-5.4.22 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.106 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.171 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.214 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.214 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.82 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  *      IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT)
  3  *      Linux INET6 implementation
  4  *
  5  *      Authors:
  6  *      Pedro Roque             <roque@di.fc.ul.pt>
  7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
  8  *
  9  *      This program is free software; you can redistribute it and/or
 10  *      modify it under the terms of the GNU General Public License
 11  *      as published by the Free Software Foundation; either version
 12  *      2 of the License, or (at your option) any later version.
 13  *
 14  *      Changes:
 15  * Roger Venning <r.venning@telstra.com>:       6to4 support
 16  * Nate Thompson <nate@thebog.net>:             6to4 support
 17  * Fred Templin <fred.l.templin@boeing.com>:    isatap support
 18  */
 19 
 20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 21 
 22 #include <linux/module.h>
 23 #include <linux/capability.h>
 24 #include <linux/errno.h>
 25 #include <linux/types.h>
 26 #include <linux/socket.h>
 27 #include <linux/sockios.h>
 28 #include <linux/net.h>
 29 #include <linux/in6.h>
 30 #include <linux/netdevice.h>
 31 #include <linux/if_arp.h>
 32 #include <linux/icmp.h>
 33 #include <linux/slab.h>
 34 #include <asm/uaccess.h>
 35 #include <linux/init.h>
 36 #include <linux/netfilter_ipv4.h>
 37 #include <linux/if_ether.h>
 38 
 39 #include <net/sock.h>
 40 #include <net/snmp.h>
 41 
 42 #include <net/ipv6.h>
 43 #include <net/protocol.h>
 44 #include <net/transp_v6.h>
 45 #include <net/ip6_fib.h>
 46 #include <net/ip6_route.h>
 47 #include <net/ndisc.h>
 48 #include <net/addrconf.h>
 49 #include <net/ip.h>
 50 #include <net/udp.h>
 51 #include <net/icmp.h>
 52 #include <net/ip_tunnels.h>
 53 #include <net/inet_ecn.h>
 54 #include <net/xfrm.h>
 55 #include <net/dsfield.h>
 56 #include <net/net_namespace.h>
 57 #include <net/netns/generic.h>
 58 
 59 /*
 60    This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c
 61 
 62    For comments look at net/ipv4/ip_gre.c --ANK
 63  */
 64 
 65 #define HASH_SIZE  16
 66 #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
 67 
 68 static bool log_ecn_error = true;
 69 module_param(log_ecn_error, bool, 0644);
 70 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
 71 
 72 static int ipip6_tunnel_init(struct net_device *dev);
 73 static void ipip6_tunnel_setup(struct net_device *dev);
 74 static void ipip6_dev_free(struct net_device *dev);
 75 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
 76                       __be32 *v4dst);
 77 static struct rtnl_link_ops sit_link_ops __read_mostly;
 78 
 79 static int sit_net_id __read_mostly;
 80 struct sit_net {
 81         struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE];
 82         struct ip_tunnel __rcu *tunnels_r[HASH_SIZE];
 83         struct ip_tunnel __rcu *tunnels_l[HASH_SIZE];
 84         struct ip_tunnel __rcu *tunnels_wc[1];
 85         struct ip_tunnel __rcu **tunnels[4];
 86 
 87         struct net_device *fb_tunnel_dev;
 88 };
 89 
 90 /*
 91  * Must be invoked with rcu_read_lock
 92  */
 93 static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net,
 94                 struct net_device *dev, __be32 remote, __be32 local)
 95 {
 96         unsigned int h0 = HASH(remote);
 97         unsigned int h1 = HASH(local);
 98         struct ip_tunnel *t;
 99         struct sit_net *sitn = net_generic(net, sit_net_id);
100 
101         for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) {
102                 if (local == t->parms.iph.saddr &&
103                     remote == t->parms.iph.daddr &&
104                     (!dev || !t->parms.link || dev->ifindex == t->parms.link) &&
105                     (t->dev->flags & IFF_UP))
106                         return t;
107         }
108         for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) {
109                 if (remote == t->parms.iph.daddr &&
110                     (!dev || !t->parms.link || dev->ifindex == t->parms.link) &&
111                     (t->dev->flags & IFF_UP))
112                         return t;
113         }
114         for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) {
115                 if (local == t->parms.iph.saddr &&
116                     (!dev || !t->parms.link || dev->ifindex == t->parms.link) &&
117                     (t->dev->flags & IFF_UP))
118                         return t;
119         }
120         t = rcu_dereference(sitn->tunnels_wc[0]);
121         if ((t != NULL) && (t->dev->flags & IFF_UP))
122                 return t;
123         return NULL;
124 }
125 
126 static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn,
127                 struct ip_tunnel_parm *parms)
128 {
129         __be32 remote = parms->iph.daddr;
130         __be32 local = parms->iph.saddr;
131         unsigned int h = 0;
132         int prio = 0;
133 
134         if (remote) {
135                 prio |= 2;
136                 h ^= HASH(remote);
137         }
138         if (local) {
139                 prio |= 1;
140                 h ^= HASH(local);
141         }
142         return &sitn->tunnels[prio][h];
143 }
144 
145 static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn,
146                 struct ip_tunnel *t)
147 {
148         return __ipip6_bucket(sitn, &t->parms);
149 }
150 
151 static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t)
152 {
153         struct ip_tunnel __rcu **tp;
154         struct ip_tunnel *iter;
155 
156         for (tp = ipip6_bucket(sitn, t);
157              (iter = rtnl_dereference(*tp)) != NULL;
158              tp = &iter->next) {
159                 if (t == iter) {
160                         rcu_assign_pointer(*tp, t->next);
161                         break;
162                 }
163         }
164 }
165 
166 static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t)
167 {
168         struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t);
169 
170         rcu_assign_pointer(t->next, rtnl_dereference(*tp));
171         rcu_assign_pointer(*tp, t);
172 }
173 
174 static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn)
175 {
176 #ifdef CONFIG_IPV6_SIT_6RD
177         struct ip_tunnel *t = netdev_priv(dev);
178 
179         if (t->dev == sitn->fb_tunnel_dev) {
180                 ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0);
181                 t->ip6rd.relay_prefix = 0;
182                 t->ip6rd.prefixlen = 16;
183                 t->ip6rd.relay_prefixlen = 0;
184         } else {
185                 struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev);
186                 memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd));
187         }
188 #endif
189 }
190 
191 static int ipip6_tunnel_create(struct net_device *dev)
192 {
193         struct ip_tunnel *t = netdev_priv(dev);
194         struct net *net = dev_net(dev);
195         struct sit_net *sitn = net_generic(net, sit_net_id);
196         int err;
197 
198         memcpy(dev->dev_addr, &t->parms.iph.saddr, 4);
199         memcpy(dev->broadcast, &t->parms.iph.daddr, 4);
200 
201         if ((__force u16)t->parms.i_flags & SIT_ISATAP)
202                 dev->priv_flags |= IFF_ISATAP;
203 
204         err = register_netdevice(dev);
205         if (err < 0)
206                 goto out;
207 
208         ipip6_tunnel_clone_6rd(dev, sitn);
209 
210         dev->rtnl_link_ops = &sit_link_ops;
211 
212         dev_hold(dev);
213 
214         ipip6_tunnel_link(sitn, t);
215         return 0;
216 
217 out:
218         return err;
219 }
220 
221 static struct ip_tunnel *ipip6_tunnel_locate(struct net *net,
222                 struct ip_tunnel_parm *parms, int create)
223 {
224         __be32 remote = parms->iph.daddr;
225         __be32 local = parms->iph.saddr;
226         struct ip_tunnel *t, *nt;
227         struct ip_tunnel __rcu **tp;
228         struct net_device *dev;
229         char name[IFNAMSIZ];
230         struct sit_net *sitn = net_generic(net, sit_net_id);
231 
232         for (tp = __ipip6_bucket(sitn, parms);
233             (t = rtnl_dereference(*tp)) != NULL;
234              tp = &t->next) {
235                 if (local == t->parms.iph.saddr &&
236                     remote == t->parms.iph.daddr &&
237                     parms->link == t->parms.link) {
238                         if (create)
239                                 return NULL;
240                         else
241                                 return t;
242                 }
243         }
244         if (!create)
245                 goto failed;
246 
247         if (parms->name[0])
248                 strlcpy(name, parms->name, IFNAMSIZ);
249         else
250                 strcpy(name, "sit%d");
251 
252         dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
253                            ipip6_tunnel_setup);
254         if (dev == NULL)
255                 return NULL;
256 
257         dev_net_set(dev, net);
258 
259         nt = netdev_priv(dev);
260 
261         nt->parms = *parms;
262         if (ipip6_tunnel_create(dev) < 0)
263                 goto failed_free;
264 
265         return nt;
266 
267 failed_free:
268         ipip6_dev_free(dev);
269 failed:
270         return NULL;
271 }
272 
273 #define for_each_prl_rcu(start)                 \
274         for (prl = rcu_dereference(start);      \
275              prl;                               \
276              prl = rcu_dereference(prl->next))
277 
278 static struct ip_tunnel_prl_entry *
279 __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
280 {
281         struct ip_tunnel_prl_entry *prl;
282 
283         for_each_prl_rcu(t->prl)
284                 if (prl->addr == addr)
285                         break;
286         return prl;
287 
288 }
289 
290 static int ipip6_tunnel_get_prl(struct ip_tunnel *t,
291                                 struct ip_tunnel_prl __user *a)
292 {
293         struct ip_tunnel_prl kprl, *kp;
294         struct ip_tunnel_prl_entry *prl;
295         unsigned int cmax, c = 0, ca, len;
296         int ret = 0;
297 
298         if (copy_from_user(&kprl, a, sizeof(kprl)))
299                 return -EFAULT;
300         cmax = kprl.datalen / sizeof(kprl);
301         if (cmax > 1 && kprl.addr != htonl(INADDR_ANY))
302                 cmax = 1;
303 
304         /* For simple GET or for root users,
305          * we try harder to allocate.
306          */
307         kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
308                 kcalloc(cmax, sizeof(*kp), GFP_KERNEL) :
309                 NULL;
310 
311         rcu_read_lock();
312 
313         ca = t->prl_count < cmax ? t->prl_count : cmax;
314 
315         if (!kp) {
316                 /* We don't try hard to allocate much memory for
317                  * non-root users.
318                  * For root users, retry allocating enough memory for
319                  * the answer.
320                  */
321                 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC);
322                 if (!kp) {
323                         ret = -ENOMEM;
324                         goto out;
325                 }
326         }
327 
328         c = 0;
329         for_each_prl_rcu(t->prl) {
330                 if (c >= cmax)
331                         break;
332                 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr)
333                         continue;
334                 kp[c].addr = prl->addr;
335                 kp[c].flags = prl->flags;
336                 c++;
337                 if (kprl.addr != htonl(INADDR_ANY))
338                         break;
339         }
340 out:
341         rcu_read_unlock();
342 
343         len = sizeof(*kp) * c;
344         ret = 0;
345         if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen))
346                 ret = -EFAULT;
347 
348         kfree(kp);
349 
350         return ret;
351 }
352 
353 static int
354 ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
355 {
356         struct ip_tunnel_prl_entry *p;
357         int err = 0;
358 
359         if (a->addr == htonl(INADDR_ANY))
360                 return -EINVAL;
361 
362         ASSERT_RTNL();
363 
364         for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) {
365                 if (p->addr == a->addr) {
366                         if (chg) {
367                                 p->flags = a->flags;
368                                 goto out;
369                         }
370                         err = -EEXIST;
371                         goto out;
372                 }
373         }
374 
375         if (chg) {
376                 err = -ENXIO;
377                 goto out;
378         }
379 
380         p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
381         if (!p) {
382                 err = -ENOBUFS;
383                 goto out;
384         }
385 
386         p->next = t->prl;
387         p->addr = a->addr;
388         p->flags = a->flags;
389         t->prl_count++;
390         rcu_assign_pointer(t->prl, p);
391 out:
392         return err;
393 }
394 
395 static void prl_list_destroy_rcu(struct rcu_head *head)
396 {
397         struct ip_tunnel_prl_entry *p, *n;
398 
399         p = container_of(head, struct ip_tunnel_prl_entry, rcu_head);
400         do {
401                 n = rcu_dereference_protected(p->next, 1);
402                 kfree(p);
403                 p = n;
404         } while (p);
405 }
406 
407 static int
408 ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
409 {
410         struct ip_tunnel_prl_entry *x;
411         struct ip_tunnel_prl_entry __rcu **p;
412         int err = 0;
413 
414         ASSERT_RTNL();
415 
416         if (a && a->addr != htonl(INADDR_ANY)) {
417                 for (p = &t->prl;
418                      (x = rtnl_dereference(*p)) != NULL;
419                      p = &x->next) {
420                         if (x->addr == a->addr) {
421                                 *p = x->next;
422                                 kfree_rcu(x, rcu_head);
423                                 t->prl_count--;
424                                 goto out;
425                         }
426                 }
427                 err = -ENXIO;
428         } else {
429                 x = rtnl_dereference(t->prl);
430                 if (x) {
431                         t->prl_count = 0;
432                         call_rcu(&x->rcu_head, prl_list_destroy_rcu);
433                         t->prl = NULL;
434                 }
435         }
436 out:
437         return err;
438 }
439 
440 static int
441 isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t)
442 {
443         struct ip_tunnel_prl_entry *p;
444         int ok = 1;
445 
446         rcu_read_lock();
447         p = __ipip6_tunnel_locate_prl(t, iph->saddr);
448         if (p) {
449                 if (p->flags & PRL_DEFAULT)
450                         skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
451                 else
452                         skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
453         } else {
454                 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
455 
456                 if (ipv6_addr_is_isatap(addr6) &&
457                     (addr6->s6_addr32[3] == iph->saddr) &&
458                     ipv6_chk_prefix(addr6, t->dev))
459                         skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
460                 else
461                         ok = 0;
462         }
463         rcu_read_unlock();
464         return ok;
465 }
466 
467 static void ipip6_tunnel_uninit(struct net_device *dev)
468 {
469         struct ip_tunnel *tunnel = netdev_priv(dev);
470         struct sit_net *sitn = net_generic(tunnel->net, sit_net_id);
471 
472         if (dev == sitn->fb_tunnel_dev) {
473                 RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL);
474         } else {
475                 ipip6_tunnel_unlink(sitn, tunnel);
476                 ipip6_tunnel_del_prl(tunnel, NULL);
477         }
478         ip_tunnel_dst_reset_all(tunnel);
479         dev_put(dev);
480 }
481 
482 /* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH
483  * if sufficient data bytes are available
484  */
485 static int ipip6_err_gen_icmpv6_unreach(struct sk_buff *skb)
486 {
487         int ihl = ((const struct iphdr *)skb->data)->ihl*4;
488         struct rt6_info *rt;
489         struct sk_buff *skb2;
490 
491         if (!pskb_may_pull(skb, ihl + sizeof(struct ipv6hdr) + 8))
492                 return 1;
493 
494         skb2 = skb_clone(skb, GFP_ATOMIC);
495 
496         if (!skb2)
497                 return 1;
498 
499         skb_dst_drop(skb2);
500         skb_pull(skb2, ihl);
501         skb_reset_network_header(skb2);
502 
503         rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0, 0);
504 
505         if (rt && rt->dst.dev)
506                 skb2->dev = rt->dst.dev;
507 
508         icmpv6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
509 
510         if (rt)
511                 ip6_rt_put(rt);
512 
513         kfree_skb(skb2);
514 
515         return 0;
516 }
517 
518 static int ipip6_err(struct sk_buff *skb, u32 info)
519 {
520         const struct iphdr *iph = (const struct iphdr *)skb->data;
521         const int type = icmp_hdr(skb)->type;
522         const int code = icmp_hdr(skb)->code;
523         struct ip_tunnel *t;
524         int err;
525 
526         switch (type) {
527         default:
528         case ICMP_PARAMETERPROB:
529                 return 0;
530 
531         case ICMP_DEST_UNREACH:
532                 switch (code) {
533                 case ICMP_SR_FAILED:
534                         /* Impossible event. */
535                         return 0;
536                 default:
537                         /* All others are translated to HOST_UNREACH.
538                            rfc2003 contains "deep thoughts" about NET_UNREACH,
539                            I believe they are just ether pollution. --ANK
540                          */
541                         break;
542                 }
543                 break;
544         case ICMP_TIME_EXCEEDED:
545                 if (code != ICMP_EXC_TTL)
546                         return 0;
547                 break;
548         case ICMP_REDIRECT:
549                 break;
550         }
551 
552         err = -ENOENT;
553 
554         t = ipip6_tunnel_lookup(dev_net(skb->dev),
555                                 skb->dev,
556                                 iph->daddr,
557                                 iph->saddr);
558         if (t == NULL)
559                 goto out;
560 
561         if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
562                 ipv4_update_pmtu(skb, dev_net(skb->dev), info,
563                                  t->parms.link, 0, IPPROTO_IPV6, 0);
564                 err = 0;
565                 goto out;
566         }
567         if (type == ICMP_REDIRECT) {
568                 ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 0,
569                               IPPROTO_IPV6, 0);
570                 err = 0;
571                 goto out;
572         }
573 
574         if (t->parms.iph.daddr == 0)
575                 goto out;
576 
577         err = 0;
578         if (!ipip6_err_gen_icmpv6_unreach(skb))
579                 goto out;
580 
581         if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
582                 goto out;
583 
584         if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
585                 t->err_count++;
586         else
587                 t->err_count = 1;
588         t->err_time = jiffies;
589 out:
590         return err;
591 }
592 
593 static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr,
594                                   const struct in6_addr *v6addr)
595 {
596         __be32 v4embed = 0;
597         if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed)
598                 return true;
599         return false;
600 }
601 
602 /* Checks if an address matches an address on the tunnel interface.
603  * Used to detect the NAT of proto 41 packets and let them pass spoofing test.
604  * Long story:
605  * This function is called after we considered the packet as spoofed
606  * in is_spoofed_6rd.
607  * We may have a router that is doing NAT for proto 41 packets
608  * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb
609  * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd
610  * function will return true, dropping the packet.
611  * But, we can still check if is spoofed against the IP
612  * addresses associated with the interface.
613  */
614 static bool only_dnatted(const struct ip_tunnel *tunnel,
615         const struct in6_addr *v6dst)
616 {
617         int prefix_len;
618 
619 #ifdef CONFIG_IPV6_SIT_6RD
620         prefix_len = tunnel->ip6rd.prefixlen + 32
621                 - tunnel->ip6rd.relay_prefixlen;
622 #else
623         prefix_len = 48;
624 #endif
625         return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev);
626 }
627 
628 /* Returns true if a packet is spoofed */
629 static bool packet_is_spoofed(struct sk_buff *skb,
630                               const struct iphdr *iph,
631                               struct ip_tunnel *tunnel)
632 {
633         const struct ipv6hdr *ipv6h;
634 
635         if (tunnel->dev->priv_flags & IFF_ISATAP) {
636                 if (!isatap_chksrc(skb, iph, tunnel))
637                         return true;
638 
639                 return false;
640         }
641 
642         if (tunnel->dev->flags & IFF_POINTOPOINT)
643                 return false;
644 
645         ipv6h = ipv6_hdr(skb);
646 
647         if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) {
648                 net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
649                                      &iph->saddr, &ipv6h->saddr,
650                                      &iph->daddr, &ipv6h->daddr);
651                 return true;
652         }
653 
654         if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr)))
655                 return false;
656 
657         if (only_dnatted(tunnel, &ipv6h->daddr))
658                 return false;
659 
660         net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
661                              &iph->saddr, &ipv6h->saddr,
662                              &iph->daddr, &ipv6h->daddr);
663         return true;
664 }
665 
666 static int ipip6_rcv(struct sk_buff *skb)
667 {
668         const struct iphdr *iph = ip_hdr(skb);
669         struct ip_tunnel *tunnel;
670         int err;
671 
672         tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
673                                      iph->saddr, iph->daddr);
674         if (tunnel != NULL) {
675                 struct pcpu_sw_netstats *tstats;
676 
677                 if (tunnel->parms.iph.protocol != IPPROTO_IPV6 &&
678                     tunnel->parms.iph.protocol != 0)
679                         goto out;
680 
681                 skb->mac_header = skb->network_header;
682                 skb_reset_network_header(skb);
683                 IPCB(skb)->flags = 0;
684                 skb->protocol = htons(ETH_P_IPV6);
685 
686                 if (packet_is_spoofed(skb, iph, tunnel)) {
687                         tunnel->dev->stats.rx_errors++;
688                         goto out;
689                 }
690 
691                 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
692 
693                 err = IP_ECN_decapsulate(iph, skb);
694                 if (unlikely(err)) {
695                         if (log_ecn_error)
696                                 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
697                                                      &iph->saddr, iph->tos);
698                         if (err > 1) {
699                                 ++tunnel->dev->stats.rx_frame_errors;
700                                 ++tunnel->dev->stats.rx_errors;
701                                 goto out;
702                         }
703                 }
704 
705                 tstats = this_cpu_ptr(tunnel->dev->tstats);
706                 u64_stats_update_begin(&tstats->syncp);
707                 tstats->rx_packets++;
708                 tstats->rx_bytes += skb->len;
709                 u64_stats_update_end(&tstats->syncp);
710 
711                 netif_rx(skb);
712 
713                 return 0;
714         }
715 
716         /* no tunnel matched,  let upstream know, ipsec may handle it */
717         return 1;
718 out:
719         kfree_skb(skb);
720         return 0;
721 }
722 
723 static const struct tnl_ptk_info tpi = {
724         /* no tunnel info required for ipip. */
725         .proto = htons(ETH_P_IP),
726 };
727 
728 static int ipip_rcv(struct sk_buff *skb)
729 {
730         const struct iphdr *iph;
731         struct ip_tunnel *tunnel;
732 
733         iph = ip_hdr(skb);
734         tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
735                                      iph->saddr, iph->daddr);
736         if (tunnel != NULL) {
737                 if (tunnel->parms.iph.protocol != IPPROTO_IPIP &&
738                     tunnel->parms.iph.protocol != 0)
739                         goto drop;
740 
741                 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
742                         goto drop;
743                 if (iptunnel_pull_header(skb, 0, tpi.proto))
744                         goto drop;
745                 return ip_tunnel_rcv(tunnel, skb, &tpi, log_ecn_error);
746         }
747 
748         return 1;
749 
750 drop:
751         kfree_skb(skb);
752         return 0;
753 }
754 
755 /*
756  * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function
757  * stores the embedded IPv4 address in v4dst and returns true.
758  */
759 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
760                       __be32 *v4dst)
761 {
762 #ifdef CONFIG_IPV6_SIT_6RD
763         if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix,
764                               tunnel->ip6rd.prefixlen)) {
765                 unsigned int pbw0, pbi0;
766                 int pbi1;
767                 u32 d;
768 
769                 pbw0 = tunnel->ip6rd.prefixlen >> 5;
770                 pbi0 = tunnel->ip6rd.prefixlen & 0x1f;
771 
772                 d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
773                     tunnel->ip6rd.relay_prefixlen;
774 
775                 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;
776                 if (pbi1 > 0)
777                         d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >>
778                              (32 - pbi1);
779 
780                 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d);
781                 return true;
782         }
783 #else
784         if (v6dst->s6_addr16[0] == htons(0x2002)) {
785                 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
786                 memcpy(v4dst, &v6dst->s6_addr16[1], 4);
787                 return true;
788         }
789 #endif
790         return false;
791 }
792 
793 static inline __be32 try_6rd(struct ip_tunnel *tunnel,
794                              const struct in6_addr *v6dst)
795 {
796         __be32 dst = 0;
797         check_6rd(tunnel, v6dst, &dst);
798         return dst;
799 }
800 
801 /*
802  *      This function assumes it is being called from dev_queue_xmit()
803  *      and that skb is filled properly by that function.
804  */
805 
806 static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
807                                      struct net_device *dev)
808 {
809         struct ip_tunnel *tunnel = netdev_priv(dev);
810         const struct iphdr  *tiph = &tunnel->parms.iph;
811         const struct ipv6hdr *iph6 = ipv6_hdr(skb);
812         u8     tos = tunnel->parms.iph.tos;
813         __be16 df = tiph->frag_off;
814         struct rtable *rt;              /* Route to the other host */
815         struct net_device *tdev;        /* Device to other host */
816         unsigned int max_headroom;      /* The extra header space needed */
817         __be32 dst = tiph->daddr;
818         struct flowi4 fl4;
819         int    mtu;
820         const struct in6_addr *addr6;
821         int addr_type;
822         u8 ttl;
823         int err;
824         u8 protocol = IPPROTO_IPV6;
825         int t_hlen = tunnel->hlen + sizeof(struct iphdr);
826 
827         if (skb->protocol != htons(ETH_P_IPV6))
828                 goto tx_error;
829 
830         if (tos == 1)
831                 tos = ipv6_get_dsfield(iph6);
832 
833         /* ISATAP (RFC4214) - must come before 6to4 */
834         if (dev->priv_flags & IFF_ISATAP) {
835                 struct neighbour *neigh = NULL;
836                 bool do_tx_error = false;
837 
838                 if (skb_dst(skb))
839                         neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
840 
841                 if (neigh == NULL) {
842                         net_dbg_ratelimited("nexthop == NULL\n");
843                         goto tx_error;
844                 }
845 
846                 addr6 = (const struct in6_addr *)&neigh->primary_key;
847                 addr_type = ipv6_addr_type(addr6);
848 
849                 if ((addr_type & IPV6_ADDR_UNICAST) &&
850                      ipv6_addr_is_isatap(addr6))
851                         dst = addr6->s6_addr32[3];
852                 else
853                         do_tx_error = true;
854 
855                 neigh_release(neigh);
856                 if (do_tx_error)
857                         goto tx_error;
858         }
859 
860         if (!dst)
861                 dst = try_6rd(tunnel, &iph6->daddr);
862 
863         if (!dst) {
864                 struct neighbour *neigh = NULL;
865                 bool do_tx_error = false;
866 
867                 if (skb_dst(skb))
868                         neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
869 
870                 if (neigh == NULL) {
871                         net_dbg_ratelimited("nexthop == NULL\n");
872                         goto tx_error;
873                 }
874 
875                 addr6 = (const struct in6_addr *)&neigh->primary_key;
876                 addr_type = ipv6_addr_type(addr6);
877 
878                 if (addr_type == IPV6_ADDR_ANY) {
879                         addr6 = &ipv6_hdr(skb)->daddr;
880                         addr_type = ipv6_addr_type(addr6);
881                 }
882 
883                 if ((addr_type & IPV6_ADDR_COMPATv4) != 0)
884                         dst = addr6->s6_addr32[3];
885                 else
886                         do_tx_error = true;
887 
888                 neigh_release(neigh);
889                 if (do_tx_error)
890                         goto tx_error;
891         }
892 
893         rt = ip_route_output_ports(tunnel->net, &fl4, NULL,
894                                    dst, tiph->saddr,
895                                    0, 0,
896                                    IPPROTO_IPV6, RT_TOS(tos),
897                                    tunnel->parms.link);
898         if (IS_ERR(rt)) {
899                 dev->stats.tx_carrier_errors++;
900                 goto tx_error_icmp;
901         }
902         if (rt->rt_type != RTN_UNICAST) {
903                 ip_rt_put(rt);
904                 dev->stats.tx_carrier_errors++;
905                 goto tx_error_icmp;
906         }
907         tdev = rt->dst.dev;
908 
909         if (tdev == dev) {
910                 ip_rt_put(rt);
911                 dev->stats.collisions++;
912                 goto tx_error;
913         }
914 
915         skb = iptunnel_handle_offloads(skb, false, SKB_GSO_SIT);
916         if (IS_ERR(skb)) {
917                 ip_rt_put(rt);
918                 goto out;
919         }
920 
921         if (df) {
922                 mtu = dst_mtu(&rt->dst) - t_hlen;
923 
924                 if (mtu < 68) {
925                         dev->stats.collisions++;
926                         ip_rt_put(rt);
927                         goto tx_error;
928                 }
929 
930                 if (mtu < IPV6_MIN_MTU) {
931                         mtu = IPV6_MIN_MTU;
932                         df = 0;
933                 }
934 
935                 if (tunnel->parms.iph.daddr && skb_dst(skb))
936                         skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
937 
938                 if (skb->len > mtu && !skb_is_gso(skb)) {
939                         icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
940                         ip_rt_put(rt);
941                         goto tx_error;
942                 }
943         }
944 
945         if (tunnel->err_count > 0) {
946                 if (time_before(jiffies,
947                                 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
948                         tunnel->err_count--;
949                         dst_link_failure(skb);
950                 } else
951                         tunnel->err_count = 0;
952         }
953 
954         /*
955          * Okay, now see if we can stuff it in the buffer as-is.
956          */
957         max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen;
958 
959         if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
960             (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
961                 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
962                 if (!new_skb) {
963                         ip_rt_put(rt);
964                         dev->stats.tx_dropped++;
965                         kfree_skb(skb);
966                         return NETDEV_TX_OK;
967                 }
968                 if (skb->sk)
969                         skb_set_owner_w(new_skb, skb->sk);
970                 dev_kfree_skb(skb);
971                 skb = new_skb;
972                 iph6 = ipv6_hdr(skb);
973         }
974         ttl = tiph->ttl;
975         if (ttl == 0)
976                 ttl = iph6->hop_limit;
977         tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
978 
979         if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) {
980                 ip_rt_put(rt);
981                 goto tx_error;
982         }
983 
984         skb_set_inner_ipproto(skb, IPPROTO_IPV6);
985 
986         err = iptunnel_xmit(skb->sk, rt, skb, fl4.saddr, fl4.daddr,
987                             protocol, tos, ttl, df,
988                             !net_eq(tunnel->net, dev_net(dev)));
989         iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
990         return NETDEV_TX_OK;
991 
992 tx_error_icmp:
993         dst_link_failure(skb);
994 tx_error:
995         kfree_skb(skb);
996 out:
997         dev->stats.tx_errors++;
998         return NETDEV_TX_OK;
999 }
1000 
1001 static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
1002 {
1003         struct ip_tunnel *tunnel = netdev_priv(dev);
1004         const struct iphdr  *tiph = &tunnel->parms.iph;
1005 
1006         skb = iptunnel_handle_offloads(skb, false, SKB_GSO_IPIP);
1007         if (IS_ERR(skb))
1008                 goto out;
1009 
1010         skb_set_inner_ipproto(skb, IPPROTO_IPIP);
1011 
1012         ip_tunnel_xmit(skb, dev, tiph, IPPROTO_IPIP);
1013         return NETDEV_TX_OK;
1014 out:
1015         dev->stats.tx_errors++;
1016         return NETDEV_TX_OK;
1017 }
1018 
1019 static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb,
1020                                    struct net_device *dev)
1021 {
1022         switch (skb->protocol) {
1023         case htons(ETH_P_IP):
1024                 ipip_tunnel_xmit(skb, dev);
1025                 break;
1026         case htons(ETH_P_IPV6):
1027                 ipip6_tunnel_xmit(skb, dev);
1028                 break;
1029         default:
1030                 goto tx_err;
1031         }
1032 
1033         return NETDEV_TX_OK;
1034 
1035 tx_err:
1036         dev->stats.tx_errors++;
1037         kfree_skb(skb);
1038         return NETDEV_TX_OK;
1039 
1040 }
1041 
1042 static void ipip6_tunnel_bind_dev(struct net_device *dev)
1043 {
1044         struct net_device *tdev = NULL;
1045         struct ip_tunnel *tunnel;
1046         const struct iphdr *iph;
1047         struct flowi4 fl4;
1048 
1049         tunnel = netdev_priv(dev);
1050         iph = &tunnel->parms.iph;
1051 
1052         if (iph->daddr) {
1053                 struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4,
1054                                                           NULL,
1055                                                           iph->daddr, iph->saddr,
1056                                                           0, 0,
1057                                                           IPPROTO_IPV6,
1058                                                           RT_TOS(iph->tos),
1059                                                           tunnel->parms.link);
1060 
1061                 if (!IS_ERR(rt)) {
1062                         tdev = rt->dst.dev;
1063                         ip_rt_put(rt);
1064                 }
1065                 dev->flags |= IFF_POINTOPOINT;
1066         }
1067 
1068         if (!tdev && tunnel->parms.link)
1069                 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link);
1070 
1071         if (tdev) {
1072                 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
1073 
1074                 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
1075                 dev->mtu = tdev->mtu - t_hlen;
1076                 if (dev->mtu < IPV6_MIN_MTU)
1077                         dev->mtu = IPV6_MIN_MTU;
1078         }
1079         dev->iflink = tunnel->parms.link;
1080 }
1081 
1082 static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p)
1083 {
1084         struct net *net = t->net;
1085         struct sit_net *sitn = net_generic(net, sit_net_id);
1086 
1087         ipip6_tunnel_unlink(sitn, t);
1088         synchronize_net();
1089         t->parms.iph.saddr = p->iph.saddr;
1090         t->parms.iph.daddr = p->iph.daddr;
1091         memcpy(t->dev->dev_addr, &p->iph.saddr, 4);
1092         memcpy(t->dev->broadcast, &p->iph.daddr, 4);
1093         ipip6_tunnel_link(sitn, t);
1094         t->parms.iph.ttl = p->iph.ttl;
1095         t->parms.iph.tos = p->iph.tos;
1096         if (t->parms.link != p->link) {
1097                 t->parms.link = p->link;
1098                 ipip6_tunnel_bind_dev(t->dev);
1099         }
1100         ip_tunnel_dst_reset_all(t);
1101         netdev_state_change(t->dev);
1102 }
1103 
1104 #ifdef CONFIG_IPV6_SIT_6RD
1105 static int ipip6_tunnel_update_6rd(struct ip_tunnel *t,
1106                                    struct ip_tunnel_6rd *ip6rd)
1107 {
1108         struct in6_addr prefix;
1109         __be32 relay_prefix;
1110 
1111         if (ip6rd->relay_prefixlen > 32 ||
1112             ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64)
1113                 return -EINVAL;
1114 
1115         ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen);
1116         if (!ipv6_addr_equal(&prefix, &ip6rd->prefix))
1117                 return -EINVAL;
1118         if (ip6rd->relay_prefixlen)
1119                 relay_prefix = ip6rd->relay_prefix &
1120                                htonl(0xffffffffUL <<
1121                                      (32 - ip6rd->relay_prefixlen));
1122         else
1123                 relay_prefix = 0;
1124         if (relay_prefix != ip6rd->relay_prefix)
1125                 return -EINVAL;
1126 
1127         t->ip6rd.prefix = prefix;
1128         t->ip6rd.relay_prefix = relay_prefix;
1129         t->ip6rd.prefixlen = ip6rd->prefixlen;
1130         t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen;
1131         ip_tunnel_dst_reset_all(t);
1132         netdev_state_change(t->dev);
1133         return 0;
1134 }
1135 #endif
1136 
1137 static int
1138 ipip6_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1139 {
1140         int err = 0;
1141         struct ip_tunnel_parm p;
1142         struct ip_tunnel_prl prl;
1143         struct ip_tunnel *t = netdev_priv(dev);
1144         struct net *net = t->net;
1145         struct sit_net *sitn = net_generic(net, sit_net_id);
1146 #ifdef CONFIG_IPV6_SIT_6RD
1147         struct ip_tunnel_6rd ip6rd;
1148 #endif
1149 
1150         switch (cmd) {
1151         case SIOCGETTUNNEL:
1152 #ifdef CONFIG_IPV6_SIT_6RD
1153         case SIOCGET6RD:
1154 #endif
1155                 if (dev == sitn->fb_tunnel_dev) {
1156                         if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1157                                 err = -EFAULT;
1158                                 break;
1159                         }
1160                         t = ipip6_tunnel_locate(net, &p, 0);
1161                         if (t == NULL)
1162                                 t = netdev_priv(dev);
1163                 }
1164 
1165                 err = -EFAULT;
1166                 if (cmd == SIOCGETTUNNEL) {
1167                         memcpy(&p, &t->parms, sizeof(p));
1168                         if (copy_to_user(ifr->ifr_ifru.ifru_data, &p,
1169                                          sizeof(p)))
1170                                 goto done;
1171 #ifdef CONFIG_IPV6_SIT_6RD
1172                 } else {
1173                         ip6rd.prefix = t->ip6rd.prefix;
1174                         ip6rd.relay_prefix = t->ip6rd.relay_prefix;
1175                         ip6rd.prefixlen = t->ip6rd.prefixlen;
1176                         ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;
1177                         if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd,
1178                                          sizeof(ip6rd)))
1179                                 goto done;
1180 #endif
1181                 }
1182                 err = 0;
1183                 break;
1184 
1185         case SIOCADDTUNNEL:
1186         case SIOCCHGTUNNEL:
1187                 err = -EPERM;
1188                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1189                         goto done;
1190 
1191                 err = -EFAULT;
1192                 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1193                         goto done;
1194 
1195                 err = -EINVAL;
1196                 if (p.iph.protocol != IPPROTO_IPV6 &&
1197                     p.iph.protocol != IPPROTO_IPIP &&
1198                     p.iph.protocol != 0)
1199                         goto done;
1200                 if (p.iph.version != 4 ||
1201                     p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
1202                         goto done;
1203                 if (p.iph.ttl)
1204                         p.iph.frag_off |= htons(IP_DF);
1205 
1206                 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
1207 
1208                 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1209                         if (t != NULL) {
1210                                 if (t->dev != dev) {
1211                                         err = -EEXIST;
1212                                         break;
1213                                 }
1214                         } else {
1215                                 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
1216                                     (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
1217                                         err = -EINVAL;
1218                                         break;
1219                                 }
1220                                 t = netdev_priv(dev);
1221                         }
1222 
1223                         ipip6_tunnel_update(t, &p);
1224                 }
1225 
1226                 if (t) {
1227                         err = 0;
1228                         if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
1229                                 err = -EFAULT;
1230                 } else
1231                         err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1232                 break;
1233 
1234         case SIOCDELTUNNEL:
1235                 err = -EPERM;
1236                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1237                         goto done;
1238 
1239                 if (dev == sitn->fb_tunnel_dev) {
1240                         err = -EFAULT;
1241                         if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1242                                 goto done;
1243                         err = -ENOENT;
1244                         t = ipip6_tunnel_locate(net, &p, 0);
1245                         if (t == NULL)
1246                                 goto done;
1247                         err = -EPERM;
1248                         if (t == netdev_priv(sitn->fb_tunnel_dev))
1249                                 goto done;
1250                         dev = t->dev;
1251                 }
1252                 unregister_netdevice(dev);
1253                 err = 0;
1254                 break;
1255 
1256         case SIOCGETPRL:
1257                 err = -EINVAL;
1258                 if (dev == sitn->fb_tunnel_dev)
1259                         goto done;
1260                 err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data);
1261                 break;
1262 
1263         case SIOCADDPRL:
1264         case SIOCDELPRL:
1265         case SIOCCHGPRL:
1266                 err = -EPERM;
1267                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1268                         goto done;
1269                 err = -EINVAL;
1270                 if (dev == sitn->fb_tunnel_dev)
1271                         goto done;
1272                 err = -EFAULT;
1273                 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
1274                         goto done;
1275 
1276                 switch (cmd) {
1277                 case SIOCDELPRL:
1278                         err = ipip6_tunnel_del_prl(t, &prl);
1279                         break;
1280                 case SIOCADDPRL:
1281                 case SIOCCHGPRL:
1282                         err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
1283                         break;
1284                 }
1285                 ip_tunnel_dst_reset_all(t);
1286                 netdev_state_change(dev);
1287                 break;
1288 
1289 #ifdef CONFIG_IPV6_SIT_6RD
1290         case SIOCADD6RD:
1291         case SIOCCHG6RD:
1292         case SIOCDEL6RD:
1293                 err = -EPERM;
1294                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1295                         goto done;
1296 
1297                 err = -EFAULT;
1298                 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data,
1299                                    sizeof(ip6rd)))
1300                         goto done;
1301 
1302                 if (cmd != SIOCDEL6RD) {
1303                         err = ipip6_tunnel_update_6rd(t, &ip6rd);
1304                         if (err < 0)
1305                                 goto done;
1306                 } else
1307                         ipip6_tunnel_clone_6rd(dev, sitn);
1308 
1309                 err = 0;
1310                 break;
1311 #endif
1312 
1313         default:
1314                 err = -EINVAL;
1315         }
1316 
1317 done:
1318         return err;
1319 }
1320 
1321 static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1322 {
1323         struct ip_tunnel *tunnel = netdev_priv(dev);
1324         int t_hlen = tunnel->hlen + sizeof(struct iphdr);
1325 
1326         if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - t_hlen)
1327                 return -EINVAL;
1328         dev->mtu = new_mtu;
1329         return 0;
1330 }
1331 
1332 static const struct net_device_ops ipip6_netdev_ops = {
1333         .ndo_init       = ipip6_tunnel_init,
1334         .ndo_uninit     = ipip6_tunnel_uninit,
1335         .ndo_start_xmit = sit_tunnel_xmit,
1336         .ndo_do_ioctl   = ipip6_tunnel_ioctl,
1337         .ndo_change_mtu = ipip6_tunnel_change_mtu,
1338         .ndo_get_stats64 = ip_tunnel_get_stats64,
1339 };
1340 
1341 static void ipip6_dev_free(struct net_device *dev)
1342 {
1343         struct ip_tunnel *tunnel = netdev_priv(dev);
1344 
1345         free_percpu(tunnel->dst_cache);
1346         free_percpu(dev->tstats);
1347         free_netdev(dev);
1348 }
1349 
1350 #define SIT_FEATURES (NETIF_F_SG           | \
1351                       NETIF_F_FRAGLIST     | \
1352                       NETIF_F_HIGHDMA      | \
1353                       NETIF_F_GSO_SOFTWARE | \
1354                       NETIF_F_HW_CSUM)
1355 
1356 static void ipip6_tunnel_setup(struct net_device *dev)
1357 {
1358         struct ip_tunnel *tunnel = netdev_priv(dev);
1359         int t_hlen = tunnel->hlen + sizeof(struct iphdr);
1360 
1361         dev->netdev_ops         = &ipip6_netdev_ops;
1362         dev->destructor         = ipip6_dev_free;
1363 
1364         dev->type               = ARPHRD_SIT;
1365         dev->hard_header_len    = LL_MAX_HEADER + t_hlen;
1366         dev->mtu                = ETH_DATA_LEN - t_hlen;
1367         dev->flags              = IFF_NOARP;
1368         netif_keep_dst(dev);
1369         dev->iflink             = 0;
1370         dev->addr_len           = 4;
1371         dev->features           |= NETIF_F_LLTX;
1372         dev->features           |= SIT_FEATURES;
1373         dev->hw_features        |= SIT_FEATURES;
1374 }
1375 
1376 static int ipip6_tunnel_init(struct net_device *dev)
1377 {
1378         struct ip_tunnel *tunnel = netdev_priv(dev);
1379 
1380         tunnel->dev = dev;
1381         tunnel->net = dev_net(dev);
1382         strcpy(tunnel->parms.name, dev->name);
1383 
1384         ipip6_tunnel_bind_dev(dev);
1385         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1386         if (!dev->tstats)
1387                 return -ENOMEM;
1388 
1389         tunnel->dst_cache = alloc_percpu(struct ip_tunnel_dst);
1390         if (!tunnel->dst_cache) {
1391                 free_percpu(dev->tstats);
1392                 return -ENOMEM;
1393         }
1394 
1395         return 0;
1396 }
1397 
1398 static int __net_init ipip6_fb_tunnel_init(struct net_device *dev)
1399 {
1400         struct ip_tunnel *tunnel = netdev_priv(dev);
1401         struct iphdr *iph = &tunnel->parms.iph;
1402         struct net *net = dev_net(dev);
1403         struct sit_net *sitn = net_generic(net, sit_net_id);
1404 
1405         tunnel->dev = dev;
1406         tunnel->net = dev_net(dev);
1407 
1408         iph->version            = 4;
1409         iph->protocol           = IPPROTO_IPV6;
1410         iph->ihl                = 5;
1411         iph->ttl                = 64;
1412 
1413         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1414         if (!dev->tstats)
1415                 return -ENOMEM;
1416 
1417         tunnel->dst_cache = alloc_percpu(struct ip_tunnel_dst);
1418         if (!tunnel->dst_cache) {
1419                 free_percpu(dev->tstats);
1420                 return -ENOMEM;
1421         }
1422 
1423         dev_hold(dev);
1424         rcu_assign_pointer(sitn->tunnels_wc[0], tunnel);
1425         return 0;
1426 }
1427 
1428 static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[])
1429 {
1430         u8 proto;
1431 
1432         if (!data || !data[IFLA_IPTUN_PROTO])
1433                 return 0;
1434 
1435         proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1436         if (proto != IPPROTO_IPV6 &&
1437             proto != IPPROTO_IPIP &&
1438             proto != 0)
1439                 return -EINVAL;
1440 
1441         return 0;
1442 }
1443 
1444 static void ipip6_netlink_parms(struct nlattr *data[],
1445                                 struct ip_tunnel_parm *parms)
1446 {
1447         memset(parms, 0, sizeof(*parms));
1448 
1449         parms->iph.version = 4;
1450         parms->iph.protocol = IPPROTO_IPV6;
1451         parms->iph.ihl = 5;
1452         parms->iph.ttl = 64;
1453 
1454         if (!data)
1455                 return;
1456 
1457         if (data[IFLA_IPTUN_LINK])
1458                 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1459 
1460         if (data[IFLA_IPTUN_LOCAL])
1461                 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]);
1462 
1463         if (data[IFLA_IPTUN_REMOTE])
1464                 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]);
1465 
1466         if (data[IFLA_IPTUN_TTL]) {
1467                 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
1468                 if (parms->iph.ttl)
1469                         parms->iph.frag_off = htons(IP_DF);
1470         }
1471 
1472         if (data[IFLA_IPTUN_TOS])
1473                 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
1474 
1475         if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
1476                 parms->iph.frag_off = htons(IP_DF);
1477 
1478         if (data[IFLA_IPTUN_FLAGS])
1479                 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]);
1480 
1481         if (data[IFLA_IPTUN_PROTO])
1482                 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1483 
1484 }
1485 
1486 /* This function returns true when ENCAP attributes are present in the nl msg */
1487 static bool ipip6_netlink_encap_parms(struct nlattr *data[],
1488                                       struct ip_tunnel_encap *ipencap)
1489 {
1490         bool ret = false;
1491 
1492         memset(ipencap, 0, sizeof(*ipencap));
1493 
1494         if (!data)
1495                 return ret;
1496 
1497         if (data[IFLA_IPTUN_ENCAP_TYPE]) {
1498                 ret = true;
1499                 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
1500         }
1501 
1502         if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
1503                 ret = true;
1504                 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
1505         }
1506 
1507         if (data[IFLA_IPTUN_ENCAP_SPORT]) {
1508                 ret = true;
1509                 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
1510         }
1511 
1512         if (data[IFLA_IPTUN_ENCAP_DPORT]) {
1513                 ret = true;
1514                 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
1515         }
1516 
1517         return ret;
1518 }
1519 
1520 #ifdef CONFIG_IPV6_SIT_6RD
1521 /* This function returns true when 6RD attributes are present in the nl msg */
1522 static bool ipip6_netlink_6rd_parms(struct nlattr *data[],
1523                                     struct ip_tunnel_6rd *ip6rd)
1524 {
1525         bool ret = false;
1526         memset(ip6rd, 0, sizeof(*ip6rd));
1527 
1528         if (!data)
1529                 return ret;
1530 
1531         if (data[IFLA_IPTUN_6RD_PREFIX]) {
1532                 ret = true;
1533                 nla_memcpy(&ip6rd->prefix, data[IFLA_IPTUN_6RD_PREFIX],
1534                            sizeof(struct in6_addr));
1535         }
1536 
1537         if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) {
1538                 ret = true;
1539                 ip6rd->relay_prefix =
1540                         nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]);
1541         }
1542 
1543         if (data[IFLA_IPTUN_6RD_PREFIXLEN]) {
1544                 ret = true;
1545                 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]);
1546         }
1547 
1548         if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) {
1549                 ret = true;
1550                 ip6rd->relay_prefixlen =
1551                         nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
1552         }
1553 
1554         return ret;
1555 }
1556 #endif
1557 
1558 static int ipip6_newlink(struct net *src_net, struct net_device *dev,
1559                          struct nlattr *tb[], struct nlattr *data[])
1560 {
1561         struct net *net = dev_net(dev);
1562         struct ip_tunnel *nt;
1563         struct ip_tunnel_encap ipencap;
1564 #ifdef CONFIG_IPV6_SIT_6RD
1565         struct ip_tunnel_6rd ip6rd;
1566 #endif
1567         int err;
1568 
1569         nt = netdev_priv(dev);
1570 
1571         if (ipip6_netlink_encap_parms(data, &ipencap)) {
1572                 err = ip_tunnel_encap_setup(nt, &ipencap);
1573                 if (err < 0)
1574                         return err;
1575         }
1576 
1577         ipip6_netlink_parms(data, &nt->parms);
1578 
1579         if (ipip6_tunnel_locate(net, &nt->parms, 0))
1580                 return -EEXIST;
1581 
1582         err = ipip6_tunnel_create(dev);
1583         if (err < 0)
1584                 return err;
1585 
1586 #ifdef CONFIG_IPV6_SIT_6RD
1587         if (ipip6_netlink_6rd_parms(data, &ip6rd))
1588                 err = ipip6_tunnel_update_6rd(nt, &ip6rd);
1589 #endif
1590 
1591         return err;
1592 }
1593 
1594 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[],
1595                           struct nlattr *data[])
1596 {
1597         struct ip_tunnel *t = netdev_priv(dev);
1598         struct ip_tunnel_parm p;
1599         struct ip_tunnel_encap ipencap;
1600         struct net *net = t->net;
1601         struct sit_net *sitn = net_generic(net, sit_net_id);
1602 #ifdef CONFIG_IPV6_SIT_6RD
1603         struct ip_tunnel_6rd ip6rd;
1604 #endif
1605         int err;
1606 
1607         if (dev == sitn->fb_tunnel_dev)
1608                 return -EINVAL;
1609 
1610         if (ipip6_netlink_encap_parms(data, &ipencap)) {
1611                 err = ip_tunnel_encap_setup(t, &ipencap);
1612                 if (err < 0)
1613                         return err;
1614         }
1615 
1616         ipip6_netlink_parms(data, &p);
1617 
1618         if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
1619             (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
1620                 return -EINVAL;
1621 
1622         t = ipip6_tunnel_locate(net, &p, 0);
1623 
1624         if (t) {
1625                 if (t->dev != dev)
1626                         return -EEXIST;
1627         } else
1628                 t = netdev_priv(dev);
1629 
1630         ipip6_tunnel_update(t, &p);
1631 
1632 #ifdef CONFIG_IPV6_SIT_6RD
1633         if (ipip6_netlink_6rd_parms(data, &ip6rd))
1634                 return ipip6_tunnel_update_6rd(t, &ip6rd);
1635 #endif
1636 
1637         return 0;
1638 }
1639 
1640 static size_t ipip6_get_size(const struct net_device *dev)
1641 {
1642         return
1643                 /* IFLA_IPTUN_LINK */
1644                 nla_total_size(4) +
1645                 /* IFLA_IPTUN_LOCAL */
1646                 nla_total_size(4) +
1647                 /* IFLA_IPTUN_REMOTE */
1648                 nla_total_size(4) +
1649                 /* IFLA_IPTUN_TTL */
1650                 nla_total_size(1) +
1651                 /* IFLA_IPTUN_TOS */
1652                 nla_total_size(1) +
1653                 /* IFLA_IPTUN_PMTUDISC */
1654                 nla_total_size(1) +
1655                 /* IFLA_IPTUN_FLAGS */
1656                 nla_total_size(2) +
1657                 /* IFLA_IPTUN_PROTO */
1658                 nla_total_size(1) +
1659 #ifdef CONFIG_IPV6_SIT_6RD
1660                 /* IFLA_IPTUN_6RD_PREFIX */
1661                 nla_total_size(sizeof(struct in6_addr)) +
1662                 /* IFLA_IPTUN_6RD_RELAY_PREFIX */
1663                 nla_total_size(4) +
1664                 /* IFLA_IPTUN_6RD_PREFIXLEN */
1665                 nla_total_size(2) +
1666                 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */
1667                 nla_total_size(2) +
1668 #endif
1669                 /* IFLA_IPTUN_ENCAP_TYPE */
1670                 nla_total_size(2) +
1671                 /* IFLA_IPTUN_ENCAP_FLAGS */
1672                 nla_total_size(2) +
1673                 /* IFLA_IPTUN_ENCAP_SPORT */
1674                 nla_total_size(2) +
1675                 /* IFLA_IPTUN_ENCAP_DPORT */
1676                 nla_total_size(2) +
1677                 0;
1678 }
1679 
1680 static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1681 {
1682         struct ip_tunnel *tunnel = netdev_priv(dev);
1683         struct ip_tunnel_parm *parm = &tunnel->parms;
1684 
1685         if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
1686             nla_put_be32(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
1687             nla_put_be32(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
1688             nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
1689             nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
1690             nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
1691                        !!(parm->iph.frag_off & htons(IP_DF))) ||
1692             nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
1693             nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags))
1694                 goto nla_put_failure;
1695 
1696 #ifdef CONFIG_IPV6_SIT_6RD
1697         if (nla_put(skb, IFLA_IPTUN_6RD_PREFIX, sizeof(struct in6_addr),
1698                     &tunnel->ip6rd.prefix) ||
1699             nla_put_be32(skb, IFLA_IPTUN_6RD_RELAY_PREFIX,
1700                          tunnel->ip6rd.relay_prefix) ||
1701             nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN,
1702                         tunnel->ip6rd.prefixlen) ||
1703             nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
1704                         tunnel->ip6rd.relay_prefixlen))
1705                 goto nla_put_failure;
1706 #endif
1707 
1708         if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE,
1709                         tunnel->encap.type) ||
1710             nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT,
1711                         tunnel->encap.sport) ||
1712             nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT,
1713                         tunnel->encap.dport) ||
1714             nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS,
1715                         tunnel->encap.flags))
1716                 goto nla_put_failure;
1717 
1718         return 0;
1719 
1720 nla_put_failure:
1721         return -EMSGSIZE;
1722 }
1723 
1724 static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = {
1725         [IFLA_IPTUN_LINK]               = { .type = NLA_U32 },
1726         [IFLA_IPTUN_LOCAL]              = { .type = NLA_U32 },
1727         [IFLA_IPTUN_REMOTE]             = { .type = NLA_U32 },
1728         [IFLA_IPTUN_TTL]                = { .type = NLA_U8 },
1729         [IFLA_IPTUN_TOS]                = { .type = NLA_U8 },
1730         [IFLA_IPTUN_PMTUDISC]           = { .type = NLA_U8 },
1731         [IFLA_IPTUN_FLAGS]              = { .type = NLA_U16 },
1732         [IFLA_IPTUN_PROTO]              = { .type = NLA_U8 },
1733 #ifdef CONFIG_IPV6_SIT_6RD
1734         [IFLA_IPTUN_6RD_PREFIX]         = { .len = sizeof(struct in6_addr) },
1735         [IFLA_IPTUN_6RD_RELAY_PREFIX]   = { .type = NLA_U32 },
1736         [IFLA_IPTUN_6RD_PREFIXLEN]      = { .type = NLA_U16 },
1737         [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 },
1738 #endif
1739         [IFLA_IPTUN_ENCAP_TYPE]         = { .type = NLA_U16 },
1740         [IFLA_IPTUN_ENCAP_FLAGS]        = { .type = NLA_U16 },
1741         [IFLA_IPTUN_ENCAP_SPORT]        = { .type = NLA_U16 },
1742         [IFLA_IPTUN_ENCAP_DPORT]        = { .type = NLA_U16 },
1743 };
1744 
1745 static void ipip6_dellink(struct net_device *dev, struct list_head *head)
1746 {
1747         struct net *net = dev_net(dev);
1748         struct sit_net *sitn = net_generic(net, sit_net_id);
1749 
1750         if (dev != sitn->fb_tunnel_dev)
1751                 unregister_netdevice_queue(dev, head);
1752 }
1753 
1754 static struct rtnl_link_ops sit_link_ops __read_mostly = {
1755         .kind           = "sit",
1756         .maxtype        = IFLA_IPTUN_MAX,
1757         .policy         = ipip6_policy,
1758         .priv_size      = sizeof(struct ip_tunnel),
1759         .setup          = ipip6_tunnel_setup,
1760         .validate       = ipip6_validate,
1761         .newlink        = ipip6_newlink,
1762         .changelink     = ipip6_changelink,
1763         .get_size       = ipip6_get_size,
1764         .fill_info      = ipip6_fill_info,
1765         .dellink        = ipip6_dellink,
1766         .get_link_net   = ip_tunnel_get_link_net,
1767 };
1768 
1769 static struct xfrm_tunnel sit_handler __read_mostly = {
1770         .handler        =       ipip6_rcv,
1771         .err_handler    =       ipip6_err,
1772         .priority       =       1,
1773 };
1774 
1775 static struct xfrm_tunnel ipip_handler __read_mostly = {
1776         .handler        =       ipip_rcv,
1777         .err_handler    =       ipip6_err,
1778         .priority       =       2,
1779 };
1780 
1781 static void __net_exit sit_destroy_tunnels(struct net *net,
1782                                            struct list_head *head)
1783 {
1784         struct sit_net *sitn = net_generic(net, sit_net_id);
1785         struct net_device *dev, *aux;
1786         int prio;
1787 
1788         for_each_netdev_safe(net, dev, aux)
1789                 if (dev->rtnl_link_ops == &sit_link_ops)
1790                         unregister_netdevice_queue(dev, head);
1791 
1792         for (prio = 1; prio < 4; prio++) {
1793                 int h;
1794                 for (h = 0; h < HASH_SIZE; h++) {
1795                         struct ip_tunnel *t;
1796 
1797                         t = rtnl_dereference(sitn->tunnels[prio][h]);
1798                         while (t != NULL) {
1799                                 /* If dev is in the same netns, it has already
1800                                  * been added to the list by the previous loop.
1801                                  */
1802                                 if (!net_eq(dev_net(t->dev), net))
1803                                         unregister_netdevice_queue(t->dev,
1804                                                                    head);
1805                                 t = rtnl_dereference(t->next);
1806                         }
1807                 }
1808         }
1809 }
1810 
1811 static int __net_init sit_init_net(struct net *net)
1812 {
1813         struct sit_net *sitn = net_generic(net, sit_net_id);
1814         struct ip_tunnel *t;
1815         int err;
1816 
1817         sitn->tunnels[0] = sitn->tunnels_wc;
1818         sitn->tunnels[1] = sitn->tunnels_l;
1819         sitn->tunnels[2] = sitn->tunnels_r;
1820         sitn->tunnels[3] = sitn->tunnels_r_l;
1821 
1822         sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
1823                                            NET_NAME_UNKNOWN,
1824                                            ipip6_tunnel_setup);
1825         if (!sitn->fb_tunnel_dev) {
1826                 err = -ENOMEM;
1827                 goto err_alloc_dev;
1828         }
1829         dev_net_set(sitn->fb_tunnel_dev, net);
1830         sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops;
1831         /* FB netdevice is special: we have one, and only one per netns.
1832          * Allowing to move it to another netns is clearly unsafe.
1833          */
1834         sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1835 
1836         err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
1837         if (err)
1838                 goto err_dev_free;
1839 
1840         ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
1841         err = register_netdev(sitn->fb_tunnel_dev);
1842         if (err)
1843                 goto err_reg_dev;
1844 
1845         t = netdev_priv(sitn->fb_tunnel_dev);
1846 
1847         strcpy(t->parms.name, sitn->fb_tunnel_dev->name);
1848         return 0;
1849 
1850 err_reg_dev:
1851         dev_put(sitn->fb_tunnel_dev);
1852 err_dev_free:
1853         ipip6_dev_free(sitn->fb_tunnel_dev);
1854 err_alloc_dev:
1855         return err;
1856 }
1857 
1858 static void __net_exit sit_exit_net(struct net *net)
1859 {
1860         LIST_HEAD(list);
1861 
1862         rtnl_lock();
1863         sit_destroy_tunnels(net, &list);
1864         unregister_netdevice_many(&list);
1865         rtnl_unlock();
1866 }
1867 
1868 static struct pernet_operations sit_net_ops = {
1869         .init = sit_init_net,
1870         .exit = sit_exit_net,
1871         .id   = &sit_net_id,
1872         .size = sizeof(struct sit_net),
1873 };
1874 
1875 static void __exit sit_cleanup(void)
1876 {
1877         rtnl_link_unregister(&sit_link_ops);
1878         xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1879         xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
1880 
1881         unregister_pernet_device(&sit_net_ops);
1882         rcu_barrier(); /* Wait for completion of call_rcu()'s */
1883 }
1884 
1885 static int __init sit_init(void)
1886 {
1887         int err;
1888 
1889         pr_info("IPv6 over IPv4 tunneling driver\n");
1890 
1891         err = register_pernet_device(&sit_net_ops);
1892         if (err < 0)
1893                 return err;
1894         err = xfrm4_tunnel_register(&sit_handler, AF_INET6);
1895         if (err < 0) {
1896                 pr_info("%s: can't register ip6ip4\n", __func__);
1897                 goto xfrm_tunnel_failed;
1898         }
1899         err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
1900         if (err < 0) {
1901                 pr_info("%s: can't register ip4ip4\n", __func__);
1902                 goto xfrm_tunnel4_failed;
1903         }
1904         err = rtnl_link_register(&sit_link_ops);
1905         if (err < 0)
1906                 goto rtnl_link_failed;
1907 
1908 out:
1909         return err;
1910 
1911 rtnl_link_failed:
1912         xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
1913 xfrm_tunnel4_failed:
1914         xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1915 xfrm_tunnel_failed:
1916         unregister_pernet_device(&sit_net_ops);
1917         goto out;
1918 }
1919 
1920 module_init(sit_init);
1921 module_exit(sit_cleanup);
1922 MODULE_LICENSE("GPL");
1923 MODULE_ALIAS_RTNL_LINK("sit");
1924 MODULE_ALIAS_NETDEV("sit0");
1925 

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