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Linux/net/ipv6/ip6_vti.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  *      IPv6 virtual tunneling interface
  4  *
  5  *      Copyright (C) 2013 secunet Security Networks AG
  6  *
  7  *      Author:
  8  *      Steffen Klassert <steffen.klassert@secunet.com>
  9  *
 10  *      Based on:
 11  *      net/ipv6/ip6_tunnel.c
 12  */
 13 
 14 #include <linux/module.h>
 15 #include <linux/capability.h>
 16 #include <linux/errno.h>
 17 #include <linux/types.h>
 18 #include <linux/sockios.h>
 19 #include <linux/icmp.h>
 20 #include <linux/if.h>
 21 #include <linux/in.h>
 22 #include <linux/ip.h>
 23 #include <linux/net.h>
 24 #include <linux/in6.h>
 25 #include <linux/netdevice.h>
 26 #include <linux/if_arp.h>
 27 #include <linux/icmpv6.h>
 28 #include <linux/init.h>
 29 #include <linux/route.h>
 30 #include <linux/rtnetlink.h>
 31 #include <linux/netfilter_ipv6.h>
 32 #include <linux/slab.h>
 33 #include <linux/hash.h>
 34 
 35 #include <linux/uaccess.h>
 36 #include <linux/atomic.h>
 37 
 38 #include <net/icmp.h>
 39 #include <net/ip.h>
 40 #include <net/ip_tunnels.h>
 41 #include <net/ipv6.h>
 42 #include <net/ip6_route.h>
 43 #include <net/addrconf.h>
 44 #include <net/ip6_tunnel.h>
 45 #include <net/xfrm.h>
 46 #include <net/net_namespace.h>
 47 #include <net/netns/generic.h>
 48 #include <linux/etherdevice.h>
 49 
 50 #define IP6_VTI_HASH_SIZE_SHIFT  5
 51 #define IP6_VTI_HASH_SIZE (1 << IP6_VTI_HASH_SIZE_SHIFT)
 52 
 53 static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
 54 {
 55         u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
 56 
 57         return hash_32(hash, IP6_VTI_HASH_SIZE_SHIFT);
 58 }
 59 
 60 static int vti6_dev_init(struct net_device *dev);
 61 static void vti6_dev_setup(struct net_device *dev);
 62 static struct rtnl_link_ops vti6_link_ops __read_mostly;
 63 
 64 static unsigned int vti6_net_id __read_mostly;
 65 struct vti6_net {
 66         /* the vti6 tunnel fallback device */
 67         struct net_device *fb_tnl_dev;
 68         /* lists for storing tunnels in use */
 69         struct ip6_tnl __rcu *tnls_r_l[IP6_VTI_HASH_SIZE];
 70         struct ip6_tnl __rcu *tnls_wc[1];
 71         struct ip6_tnl __rcu **tnls[2];
 72 };
 73 
 74 #define for_each_vti6_tunnel_rcu(start) \
 75         for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
 76 
 77 /**
 78  * vti6_tnl_lookup - fetch tunnel matching the end-point addresses
 79  *   @net: network namespace
 80  *   @remote: the address of the tunnel exit-point
 81  *   @local: the address of the tunnel entry-point
 82  *
 83  * Return:
 84  *   tunnel matching given end-points if found,
 85  *   else fallback tunnel if its device is up,
 86  *   else %NULL
 87  **/
 88 static struct ip6_tnl *
 89 vti6_tnl_lookup(struct net *net, const struct in6_addr *remote,
 90                 const struct in6_addr *local)
 91 {
 92         unsigned int hash = HASH(remote, local);
 93         struct ip6_tnl *t;
 94         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
 95         struct in6_addr any;
 96 
 97         for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
 98                 if (ipv6_addr_equal(local, &t->parms.laddr) &&
 99                     ipv6_addr_equal(remote, &t->parms.raddr) &&
100                     (t->dev->flags & IFF_UP))
101                         return t;
102         }
103 
104         memset(&any, 0, sizeof(any));
105         hash = HASH(&any, local);
106         for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
107                 if (ipv6_addr_equal(local, &t->parms.laddr) &&
108                     (t->dev->flags & IFF_UP))
109                         return t;
110         }
111 
112         hash = HASH(remote, &any);
113         for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
114                 if (ipv6_addr_equal(remote, &t->parms.raddr) &&
115                     (t->dev->flags & IFF_UP))
116                         return t;
117         }
118 
119         t = rcu_dereference(ip6n->tnls_wc[0]);
120         if (t && (t->dev->flags & IFF_UP))
121                 return t;
122 
123         return NULL;
124 }
125 
126 /**
127  * vti6_tnl_bucket - get head of list matching given tunnel parameters
128  *   @p: parameters containing tunnel end-points
129  *
130  * Description:
131  *   vti6_tnl_bucket() returns the head of the list matching the
132  *   &struct in6_addr entries laddr and raddr in @p.
133  *
134  * Return: head of IPv6 tunnel list
135  **/
136 static struct ip6_tnl __rcu **
137 vti6_tnl_bucket(struct vti6_net *ip6n, const struct __ip6_tnl_parm *p)
138 {
139         const struct in6_addr *remote = &p->raddr;
140         const struct in6_addr *local = &p->laddr;
141         unsigned int h = 0;
142         int prio = 0;
143 
144         if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
145                 prio = 1;
146                 h = HASH(remote, local);
147         }
148         return &ip6n->tnls[prio][h];
149 }
150 
151 static void
152 vti6_tnl_link(struct vti6_net *ip6n, struct ip6_tnl *t)
153 {
154         struct ip6_tnl __rcu **tp = vti6_tnl_bucket(ip6n, &t->parms);
155 
156         rcu_assign_pointer(t->next , rtnl_dereference(*tp));
157         rcu_assign_pointer(*tp, t);
158 }
159 
160 static void
161 vti6_tnl_unlink(struct vti6_net *ip6n, struct ip6_tnl *t)
162 {
163         struct ip6_tnl __rcu **tp;
164         struct ip6_tnl *iter;
165 
166         for (tp = vti6_tnl_bucket(ip6n, &t->parms);
167              (iter = rtnl_dereference(*tp)) != NULL;
168              tp = &iter->next) {
169                 if (t == iter) {
170                         rcu_assign_pointer(*tp, t->next);
171                         break;
172                 }
173         }
174 }
175 
176 static void vti6_dev_free(struct net_device *dev)
177 {
178         free_percpu(dev->tstats);
179 }
180 
181 static int vti6_tnl_create2(struct net_device *dev)
182 {
183         struct ip6_tnl *t = netdev_priv(dev);
184         struct net *net = dev_net(dev);
185         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
186         int err;
187 
188         dev->rtnl_link_ops = &vti6_link_ops;
189         err = register_netdevice(dev);
190         if (err < 0)
191                 goto out;
192 
193         strcpy(t->parms.name, dev->name);
194 
195         dev_hold(dev);
196         vti6_tnl_link(ip6n, t);
197 
198         return 0;
199 
200 out:
201         return err;
202 }
203 
204 static struct ip6_tnl *vti6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
205 {
206         struct net_device *dev;
207         struct ip6_tnl *t;
208         char name[IFNAMSIZ];
209         int err;
210 
211         if (p->name[0]) {
212                 if (!dev_valid_name(p->name))
213                         goto failed;
214                 strlcpy(name, p->name, IFNAMSIZ);
215         } else {
216                 sprintf(name, "ip6_vti%%d");
217         }
218 
219         dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, vti6_dev_setup);
220         if (!dev)
221                 goto failed;
222 
223         dev_net_set(dev, net);
224 
225         t = netdev_priv(dev);
226         t->parms = *p;
227         t->net = dev_net(dev);
228 
229         err = vti6_tnl_create2(dev);
230         if (err < 0)
231                 goto failed_free;
232 
233         return t;
234 
235 failed_free:
236         free_netdev(dev);
237 failed:
238         return NULL;
239 }
240 
241 /**
242  * vti6_locate - find or create tunnel matching given parameters
243  *   @net: network namespace
244  *   @p: tunnel parameters
245  *   @create: != 0 if allowed to create new tunnel if no match found
246  *
247  * Description:
248  *   vti6_locate() first tries to locate an existing tunnel
249  *   based on @parms. If this is unsuccessful, but @create is set a new
250  *   tunnel device is created and registered for use.
251  *
252  * Return:
253  *   matching tunnel or NULL
254  **/
255 static struct ip6_tnl *vti6_locate(struct net *net, struct __ip6_tnl_parm *p,
256                                    int create)
257 {
258         const struct in6_addr *remote = &p->raddr;
259         const struct in6_addr *local = &p->laddr;
260         struct ip6_tnl __rcu **tp;
261         struct ip6_tnl *t;
262         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
263 
264         for (tp = vti6_tnl_bucket(ip6n, p);
265              (t = rtnl_dereference(*tp)) != NULL;
266              tp = &t->next) {
267                 if (ipv6_addr_equal(local, &t->parms.laddr) &&
268                     ipv6_addr_equal(remote, &t->parms.raddr)) {
269                         if (create)
270                                 return NULL;
271 
272                         return t;
273                 }
274         }
275         if (!create)
276                 return NULL;
277         return vti6_tnl_create(net, p);
278 }
279 
280 /**
281  * vti6_dev_uninit - tunnel device uninitializer
282  *   @dev: the device to be destroyed
283  *
284  * Description:
285  *   vti6_dev_uninit() removes tunnel from its list
286  **/
287 static void vti6_dev_uninit(struct net_device *dev)
288 {
289         struct ip6_tnl *t = netdev_priv(dev);
290         struct vti6_net *ip6n = net_generic(t->net, vti6_net_id);
291 
292         if (dev == ip6n->fb_tnl_dev)
293                 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
294         else
295                 vti6_tnl_unlink(ip6n, t);
296         dev_put(dev);
297 }
298 
299 static int vti6_input_proto(struct sk_buff *skb, int nexthdr, __be32 spi,
300                             int encap_type)
301 {
302         struct ip6_tnl *t;
303         const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
304 
305         rcu_read_lock();
306         t = vti6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
307         if (t) {
308                 if (t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) {
309                         rcu_read_unlock();
310                         goto discard;
311                 }
312 
313                 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
314                         rcu_read_unlock();
315                         goto discard;
316                 }
317 
318                 ipv6h = ipv6_hdr(skb);
319                 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
320                         t->dev->stats.rx_dropped++;
321                         rcu_read_unlock();
322                         goto discard;
323                 }
324 
325                 rcu_read_unlock();
326 
327                 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = t;
328                 XFRM_SPI_SKB_CB(skb)->family = AF_INET6;
329                 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr);
330                 return xfrm_input(skb, nexthdr, spi, encap_type);
331         }
332         rcu_read_unlock();
333         return -EINVAL;
334 discard:
335         kfree_skb(skb);
336         return 0;
337 }
338 
339 static int vti6_rcv(struct sk_buff *skb)
340 {
341         int nexthdr = skb_network_header(skb)[IP6CB(skb)->nhoff];
342 
343         return vti6_input_proto(skb, nexthdr, 0, 0);
344 }
345 
346 static int vti6_rcv_cb(struct sk_buff *skb, int err)
347 {
348         unsigned short family;
349         struct net_device *dev;
350         struct pcpu_sw_netstats *tstats;
351         struct xfrm_state *x;
352         const struct xfrm_mode *inner_mode;
353         struct ip6_tnl *t = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6;
354         u32 orig_mark = skb->mark;
355         int ret;
356 
357         if (!t)
358                 return 1;
359 
360         dev = t->dev;
361 
362         if (err) {
363                 dev->stats.rx_errors++;
364                 dev->stats.rx_dropped++;
365 
366                 return 0;
367         }
368 
369         x = xfrm_input_state(skb);
370 
371         inner_mode = &x->inner_mode;
372 
373         if (x->sel.family == AF_UNSPEC) {
374                 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
375                 if (inner_mode == NULL) {
376                         XFRM_INC_STATS(dev_net(skb->dev),
377                                        LINUX_MIB_XFRMINSTATEMODEERROR);
378                         return -EINVAL;
379                 }
380         }
381 
382         family = inner_mode->family;
383 
384         skb->mark = be32_to_cpu(t->parms.i_key);
385         ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);
386         skb->mark = orig_mark;
387 
388         if (!ret)
389                 return -EPERM;
390 
391         skb_scrub_packet(skb, !net_eq(t->net, dev_net(skb->dev)));
392         skb->dev = dev;
393 
394         tstats = this_cpu_ptr(dev->tstats);
395         u64_stats_update_begin(&tstats->syncp);
396         tstats->rx_packets++;
397         tstats->rx_bytes += skb->len;
398         u64_stats_update_end(&tstats->syncp);
399 
400         return 0;
401 }
402 
403 /**
404  * vti6_addr_conflict - compare packet addresses to tunnel's own
405  *   @t: the outgoing tunnel device
406  *   @hdr: IPv6 header from the incoming packet
407  *
408  * Description:
409  *   Avoid trivial tunneling loop by checking that tunnel exit-point
410  *   doesn't match source of incoming packet.
411  *
412  * Return:
413  *   1 if conflict,
414  *   0 else
415  **/
416 static inline bool
417 vti6_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
418 {
419         return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
420 }
421 
422 static bool vti6_state_check(const struct xfrm_state *x,
423                              const struct in6_addr *dst,
424                              const struct in6_addr *src)
425 {
426         xfrm_address_t *daddr = (xfrm_address_t *)dst;
427         xfrm_address_t *saddr = (xfrm_address_t *)src;
428 
429         /* if there is no transform then this tunnel is not functional.
430          * Or if the xfrm is not mode tunnel.
431          */
432         if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
433             x->props.family != AF_INET6)
434                 return false;
435 
436         if (ipv6_addr_any(dst))
437                 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET6);
438 
439         if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET6))
440                 return false;
441 
442         return true;
443 }
444 
445 /**
446  * vti6_xmit - send a packet
447  *   @skb: the outgoing socket buffer
448  *   @dev: the outgoing tunnel device
449  *   @fl: the flow informations for the xfrm_lookup
450  **/
451 static int
452 vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
453 {
454         struct ip6_tnl *t = netdev_priv(dev);
455         struct net_device_stats *stats = &t->dev->stats;
456         struct dst_entry *dst = skb_dst(skb);
457         struct net_device *tdev;
458         struct xfrm_state *x;
459         int pkt_len = skb->len;
460         int err = -1;
461         int mtu;
462 
463         if (!dst) {
464                 switch (skb->protocol) {
465                 case htons(ETH_P_IP): {
466                         struct rtable *rt;
467 
468                         fl->u.ip4.flowi4_oif = dev->ifindex;
469                         fl->u.ip4.flowi4_flags |= FLOWI_FLAG_ANYSRC;
470                         rt = __ip_route_output_key(dev_net(dev), &fl->u.ip4);
471                         if (IS_ERR(rt))
472                                 goto tx_err_link_failure;
473                         dst = &rt->dst;
474                         skb_dst_set(skb, dst);
475                         break;
476                 }
477                 case htons(ETH_P_IPV6):
478                         fl->u.ip6.flowi6_oif = dev->ifindex;
479                         fl->u.ip6.flowi6_flags |= FLOWI_FLAG_ANYSRC;
480                         dst = ip6_route_output(dev_net(dev), NULL, &fl->u.ip6);
481                         if (dst->error) {
482                                 dst_release(dst);
483                                 dst = NULL;
484                                 goto tx_err_link_failure;
485                         }
486                         skb_dst_set(skb, dst);
487                         break;
488                 default:
489                         goto tx_err_link_failure;
490                 }
491         }
492 
493         dst_hold(dst);
494         dst = xfrm_lookup(t->net, dst, fl, NULL, 0);
495         if (IS_ERR(dst)) {
496                 err = PTR_ERR(dst);
497                 dst = NULL;
498                 goto tx_err_link_failure;
499         }
500 
501         x = dst->xfrm;
502         if (!vti6_state_check(x, &t->parms.raddr, &t->parms.laddr))
503                 goto tx_err_link_failure;
504 
505         if (!ip6_tnl_xmit_ctl(t, (const struct in6_addr *)&x->props.saddr,
506                               (const struct in6_addr *)&x->id.daddr))
507                 goto tx_err_link_failure;
508 
509         tdev = dst->dev;
510 
511         if (tdev == dev) {
512                 stats->collisions++;
513                 net_warn_ratelimited("%s: Local routing loop detected!\n",
514                                      t->parms.name);
515                 goto tx_err_dst_release;
516         }
517 
518         mtu = dst_mtu(dst);
519         if (skb->len > mtu) {
520                 skb_dst_update_pmtu_no_confirm(skb, mtu);
521 
522                 if (skb->protocol == htons(ETH_P_IPV6)) {
523                         if (mtu < IPV6_MIN_MTU)
524                                 mtu = IPV6_MIN_MTU;
525 
526                         icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
527                 } else {
528                         icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
529                                   htonl(mtu));
530                 }
531 
532                 err = -EMSGSIZE;
533                 goto tx_err_dst_release;
534         }
535 
536         skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
537         skb_dst_set(skb, dst);
538         skb->dev = skb_dst(skb)->dev;
539 
540         err = dst_output(t->net, skb->sk, skb);
541         if (net_xmit_eval(err) == 0)
542                 err = pkt_len;
543         iptunnel_xmit_stats(dev, err);
544 
545         return 0;
546 tx_err_link_failure:
547         stats->tx_carrier_errors++;
548         dst_link_failure(skb);
549 tx_err_dst_release:
550         dst_release(dst);
551         return err;
552 }
553 
554 static netdev_tx_t
555 vti6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
556 {
557         struct ip6_tnl *t = netdev_priv(dev);
558         struct net_device_stats *stats = &t->dev->stats;
559         struct flowi fl;
560         int ret;
561 
562         if (!pskb_inet_may_pull(skb))
563                 goto tx_err;
564 
565         memset(&fl, 0, sizeof(fl));
566 
567         switch (skb->protocol) {
568         case htons(ETH_P_IPV6):
569                 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
570                     vti6_addr_conflict(t, ipv6_hdr(skb)))
571                         goto tx_err;
572 
573                 xfrm_decode_session(skb, &fl, AF_INET6);
574                 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
575                 break;
576         case htons(ETH_P_IP):
577                 xfrm_decode_session(skb, &fl, AF_INET);
578                 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
579                 break;
580         default:
581                 goto tx_err;
582         }
583 
584         /* override mark with tunnel output key */
585         fl.flowi_mark = be32_to_cpu(t->parms.o_key);
586 
587         ret = vti6_xmit(skb, dev, &fl);
588         if (ret < 0)
589                 goto tx_err;
590 
591         return NETDEV_TX_OK;
592 
593 tx_err:
594         stats->tx_errors++;
595         stats->tx_dropped++;
596         kfree_skb(skb);
597         return NETDEV_TX_OK;
598 }
599 
600 static int vti6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
601                     u8 type, u8 code, int offset, __be32 info)
602 {
603         __be32 spi;
604         __u32 mark;
605         struct xfrm_state *x;
606         struct ip6_tnl *t;
607         struct ip_esp_hdr *esph;
608         struct ip_auth_hdr *ah;
609         struct ip_comp_hdr *ipch;
610         struct net *net = dev_net(skb->dev);
611         const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
612         int protocol = iph->nexthdr;
613 
614         t = vti6_tnl_lookup(dev_net(skb->dev), &iph->daddr, &iph->saddr);
615         if (!t)
616                 return -1;
617 
618         mark = be32_to_cpu(t->parms.o_key);
619 
620         switch (protocol) {
621         case IPPROTO_ESP:
622                 esph = (struct ip_esp_hdr *)(skb->data + offset);
623                 spi = esph->spi;
624                 break;
625         case IPPROTO_AH:
626                 ah = (struct ip_auth_hdr *)(skb->data + offset);
627                 spi = ah->spi;
628                 break;
629         case IPPROTO_COMP:
630                 ipch = (struct ip_comp_hdr *)(skb->data + offset);
631                 spi = htonl(ntohs(ipch->cpi));
632                 break;
633         default:
634                 return 0;
635         }
636 
637         if (type != ICMPV6_PKT_TOOBIG &&
638             type != NDISC_REDIRECT)
639                 return 0;
640 
641         x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
642                               spi, protocol, AF_INET6);
643         if (!x)
644                 return 0;
645 
646         if (type == NDISC_REDIRECT)
647                 ip6_redirect(skb, net, skb->dev->ifindex, 0,
648                              sock_net_uid(net, NULL));
649         else
650                 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
651         xfrm_state_put(x);
652 
653         return 0;
654 }
655 
656 static void vti6_link_config(struct ip6_tnl *t, bool keep_mtu)
657 {
658         struct net_device *dev = t->dev;
659         struct __ip6_tnl_parm *p = &t->parms;
660         struct net_device *tdev = NULL;
661         int mtu;
662 
663         memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
664         memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
665 
666         p->flags &= ~(IP6_TNL_F_CAP_XMIT | IP6_TNL_F_CAP_RCV |
667                       IP6_TNL_F_CAP_PER_PACKET);
668         p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
669 
670         if (p->flags & IP6_TNL_F_CAP_XMIT && p->flags & IP6_TNL_F_CAP_RCV)
671                 dev->flags |= IFF_POINTOPOINT;
672         else
673                 dev->flags &= ~IFF_POINTOPOINT;
674 
675         if (keep_mtu && dev->mtu) {
676                 dev->mtu = clamp(dev->mtu, dev->min_mtu, dev->max_mtu);
677                 return;
678         }
679 
680         if (p->flags & IP6_TNL_F_CAP_XMIT) {
681                 int strict = (ipv6_addr_type(&p->raddr) &
682                               (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL));
683                 struct rt6_info *rt = rt6_lookup(t->net,
684                                                  &p->raddr, &p->laddr,
685                                                  p->link, NULL, strict);
686 
687                 if (rt)
688                         tdev = rt->dst.dev;
689                 ip6_rt_put(rt);
690         }
691 
692         if (!tdev && p->link)
693                 tdev = __dev_get_by_index(t->net, p->link);
694 
695         if (tdev)
696                 mtu = tdev->mtu - sizeof(struct ipv6hdr);
697         else
698                 mtu = ETH_DATA_LEN - LL_MAX_HEADER - sizeof(struct ipv6hdr);
699 
700         dev->mtu = max_t(int, mtu, IPV4_MIN_MTU);
701 }
702 
703 /**
704  * vti6_tnl_change - update the tunnel parameters
705  *   @t: tunnel to be changed
706  *   @p: tunnel configuration parameters
707  *   @keep_mtu: MTU was set from userspace, don't re-compute it
708  *
709  * Description:
710  *   vti6_tnl_change() updates the tunnel parameters
711  **/
712 static int
713 vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
714                 bool keep_mtu)
715 {
716         t->parms.laddr = p->laddr;
717         t->parms.raddr = p->raddr;
718         t->parms.link = p->link;
719         t->parms.i_key = p->i_key;
720         t->parms.o_key = p->o_key;
721         t->parms.proto = p->proto;
722         t->parms.fwmark = p->fwmark;
723         dst_cache_reset(&t->dst_cache);
724         vti6_link_config(t, keep_mtu);
725         return 0;
726 }
727 
728 static int vti6_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p,
729                        bool keep_mtu)
730 {
731         struct net *net = dev_net(t->dev);
732         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
733         int err;
734 
735         vti6_tnl_unlink(ip6n, t);
736         synchronize_net();
737         err = vti6_tnl_change(t, p, keep_mtu);
738         vti6_tnl_link(ip6n, t);
739         netdev_state_change(t->dev);
740         return err;
741 }
742 
743 static void
744 vti6_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u)
745 {
746         p->laddr = u->laddr;
747         p->raddr = u->raddr;
748         p->link = u->link;
749         p->i_key = u->i_key;
750         p->o_key = u->o_key;
751         p->proto = u->proto;
752 
753         memcpy(p->name, u->name, sizeof(u->name));
754 }
755 
756 static void
757 vti6_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p)
758 {
759         u->laddr = p->laddr;
760         u->raddr = p->raddr;
761         u->link = p->link;
762         u->i_key = p->i_key;
763         u->o_key = p->o_key;
764         if (u->i_key)
765                 u->i_flags |= GRE_KEY;
766         if (u->o_key)
767                 u->o_flags |= GRE_KEY;
768         u->proto = p->proto;
769 
770         memcpy(u->name, p->name, sizeof(u->name));
771 }
772 
773 /**
774  * vti6_ioctl - configure vti6 tunnels from userspace
775  *   @dev: virtual device associated with tunnel
776  *   @ifr: parameters passed from userspace
777  *   @cmd: command to be performed
778  *
779  * Description:
780  *   vti6_ioctl() is used for managing vti6 tunnels
781  *   from userspace.
782  *
783  *   The possible commands are the following:
784  *     %SIOCGETTUNNEL: get tunnel parameters for device
785  *     %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
786  *     %SIOCCHGTUNNEL: change tunnel parameters to those given
787  *     %SIOCDELTUNNEL: delete tunnel
788  *
789  *   The fallback device "ip6_vti0", created during module
790  *   initialization, can be used for creating other tunnel devices.
791  *
792  * Return:
793  *   0 on success,
794  *   %-EFAULT if unable to copy data to or from userspace,
795  *   %-EPERM if current process hasn't %CAP_NET_ADMIN set
796  *   %-EINVAL if passed tunnel parameters are invalid,
797  *   %-EEXIST if changing a tunnel's parameters would cause a conflict
798  *   %-ENODEV if attempting to change or delete a nonexisting device
799  **/
800 static int
801 vti6_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
802 {
803         int err = 0;
804         struct ip6_tnl_parm2 p;
805         struct __ip6_tnl_parm p1;
806         struct ip6_tnl *t = NULL;
807         struct net *net = dev_net(dev);
808         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
809 
810         switch (cmd) {
811         case SIOCGETTUNNEL:
812                 if (dev == ip6n->fb_tnl_dev) {
813                         if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
814                                 err = -EFAULT;
815                                 break;
816                         }
817                         vti6_parm_from_user(&p1, &p);
818                         t = vti6_locate(net, &p1, 0);
819                 } else {
820                         memset(&p, 0, sizeof(p));
821                 }
822                 if (!t)
823                         t = netdev_priv(dev);
824                 vti6_parm_to_user(&p, &t->parms);
825                 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
826                         err = -EFAULT;
827                 break;
828         case SIOCADDTUNNEL:
829         case SIOCCHGTUNNEL:
830                 err = -EPERM;
831                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
832                         break;
833                 err = -EFAULT;
834                 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
835                         break;
836                 err = -EINVAL;
837                 if (p.proto != IPPROTO_IPV6  && p.proto != 0)
838                         break;
839                 vti6_parm_from_user(&p1, &p);
840                 t = vti6_locate(net, &p1, cmd == SIOCADDTUNNEL);
841                 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
842                         if (t) {
843                                 if (t->dev != dev) {
844                                         err = -EEXIST;
845                                         break;
846                                 }
847                         } else
848                                 t = netdev_priv(dev);
849 
850                         err = vti6_update(t, &p1, false);
851                 }
852                 if (t) {
853                         err = 0;
854                         vti6_parm_to_user(&p, &t->parms);
855                         if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
856                                 err = -EFAULT;
857 
858                 } else
859                         err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
860                 break;
861         case SIOCDELTUNNEL:
862                 err = -EPERM;
863                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
864                         break;
865 
866                 if (dev == ip6n->fb_tnl_dev) {
867                         err = -EFAULT;
868                         if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
869                                 break;
870                         err = -ENOENT;
871                         vti6_parm_from_user(&p1, &p);
872                         t = vti6_locate(net, &p1, 0);
873                         if (!t)
874                                 break;
875                         err = -EPERM;
876                         if (t->dev == ip6n->fb_tnl_dev)
877                                 break;
878                         dev = t->dev;
879                 }
880                 err = 0;
881                 unregister_netdevice(dev);
882                 break;
883         default:
884                 err = -EINVAL;
885         }
886         return err;
887 }
888 
889 static const struct net_device_ops vti6_netdev_ops = {
890         .ndo_init       = vti6_dev_init,
891         .ndo_uninit     = vti6_dev_uninit,
892         .ndo_start_xmit = vti6_tnl_xmit,
893         .ndo_do_ioctl   = vti6_ioctl,
894         .ndo_get_stats64 = ip_tunnel_get_stats64,
895         .ndo_get_iflink = ip6_tnl_get_iflink,
896 };
897 
898 /**
899  * vti6_dev_setup - setup virtual tunnel device
900  *   @dev: virtual device associated with tunnel
901  *
902  * Description:
903  *   Initialize function pointers and device parameters
904  **/
905 static void vti6_dev_setup(struct net_device *dev)
906 {
907         dev->netdev_ops = &vti6_netdev_ops;
908         dev->header_ops = &ip_tunnel_header_ops;
909         dev->needs_free_netdev = true;
910         dev->priv_destructor = vti6_dev_free;
911 
912         dev->type = ARPHRD_TUNNEL6;
913         dev->min_mtu = IPV4_MIN_MTU;
914         dev->max_mtu = IP_MAX_MTU - sizeof(struct ipv6hdr);
915         dev->flags |= IFF_NOARP;
916         dev->addr_len = sizeof(struct in6_addr);
917         netif_keep_dst(dev);
918         /* This perm addr will be used as interface identifier by IPv6 */
919         dev->addr_assign_type = NET_ADDR_RANDOM;
920         eth_random_addr(dev->perm_addr);
921 }
922 
923 /**
924  * vti6_dev_init_gen - general initializer for all tunnel devices
925  *   @dev: virtual device associated with tunnel
926  **/
927 static inline int vti6_dev_init_gen(struct net_device *dev)
928 {
929         struct ip6_tnl *t = netdev_priv(dev);
930 
931         t->dev = dev;
932         t->net = dev_net(dev);
933         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
934         if (!dev->tstats)
935                 return -ENOMEM;
936         return 0;
937 }
938 
939 /**
940  * vti6_dev_init - initializer for all non fallback tunnel devices
941  *   @dev: virtual device associated with tunnel
942  **/
943 static int vti6_dev_init(struct net_device *dev)
944 {
945         struct ip6_tnl *t = netdev_priv(dev);
946         int err = vti6_dev_init_gen(dev);
947 
948         if (err)
949                 return err;
950         vti6_link_config(t, true);
951         return 0;
952 }
953 
954 /**
955  * vti6_fb_tnl_dev_init - initializer for fallback tunnel device
956  *   @dev: fallback device
957  *
958  * Return: 0
959  **/
960 static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev)
961 {
962         struct ip6_tnl *t = netdev_priv(dev);
963         struct net *net = dev_net(dev);
964         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
965 
966         t->parms.proto = IPPROTO_IPV6;
967         dev_hold(dev);
968 
969         rcu_assign_pointer(ip6n->tnls_wc[0], t);
970         return 0;
971 }
972 
973 static int vti6_validate(struct nlattr *tb[], struct nlattr *data[],
974                          struct netlink_ext_ack *extack)
975 {
976         return 0;
977 }
978 
979 static void vti6_netlink_parms(struct nlattr *data[],
980                                struct __ip6_tnl_parm *parms)
981 {
982         memset(parms, 0, sizeof(*parms));
983 
984         if (!data)
985                 return;
986 
987         if (data[IFLA_VTI_LINK])
988                 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
989 
990         if (data[IFLA_VTI_LOCAL])
991                 parms->laddr = nla_get_in6_addr(data[IFLA_VTI_LOCAL]);
992 
993         if (data[IFLA_VTI_REMOTE])
994                 parms->raddr = nla_get_in6_addr(data[IFLA_VTI_REMOTE]);
995 
996         if (data[IFLA_VTI_IKEY])
997                 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
998 
999         if (data[IFLA_VTI_OKEY])
1000                 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
1001 
1002         if (data[IFLA_VTI_FWMARK])
1003                 parms->fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]);
1004 }
1005 
1006 static int vti6_newlink(struct net *src_net, struct net_device *dev,
1007                         struct nlattr *tb[], struct nlattr *data[],
1008                         struct netlink_ext_ack *extack)
1009 {
1010         struct net *net = dev_net(dev);
1011         struct ip6_tnl *nt;
1012 
1013         nt = netdev_priv(dev);
1014         vti6_netlink_parms(data, &nt->parms);
1015 
1016         nt->parms.proto = IPPROTO_IPV6;
1017 
1018         if (vti6_locate(net, &nt->parms, 0))
1019                 return -EEXIST;
1020 
1021         return vti6_tnl_create2(dev);
1022 }
1023 
1024 static void vti6_dellink(struct net_device *dev, struct list_head *head)
1025 {
1026         struct net *net = dev_net(dev);
1027         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1028 
1029         if (dev != ip6n->fb_tnl_dev)
1030                 unregister_netdevice_queue(dev, head);
1031 }
1032 
1033 static int vti6_changelink(struct net_device *dev, struct nlattr *tb[],
1034                            struct nlattr *data[],
1035                            struct netlink_ext_ack *extack)
1036 {
1037         struct ip6_tnl *t;
1038         struct __ip6_tnl_parm p;
1039         struct net *net = dev_net(dev);
1040         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1041 
1042         if (dev == ip6n->fb_tnl_dev)
1043                 return -EINVAL;
1044 
1045         vti6_netlink_parms(data, &p);
1046 
1047         t = vti6_locate(net, &p, 0);
1048 
1049         if (t) {
1050                 if (t->dev != dev)
1051                         return -EEXIST;
1052         } else
1053                 t = netdev_priv(dev);
1054 
1055         return vti6_update(t, &p, tb && tb[IFLA_MTU]);
1056 }
1057 
1058 static size_t vti6_get_size(const struct net_device *dev)
1059 {
1060         return
1061                 /* IFLA_VTI_LINK */
1062                 nla_total_size(4) +
1063                 /* IFLA_VTI_LOCAL */
1064                 nla_total_size(sizeof(struct in6_addr)) +
1065                 /* IFLA_VTI_REMOTE */
1066                 nla_total_size(sizeof(struct in6_addr)) +
1067                 /* IFLA_VTI_IKEY */
1068                 nla_total_size(4) +
1069                 /* IFLA_VTI_OKEY */
1070                 nla_total_size(4) +
1071                 /* IFLA_VTI_FWMARK */
1072                 nla_total_size(4) +
1073                 0;
1074 }
1075 
1076 static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1077 {
1078         struct ip6_tnl *tunnel = netdev_priv(dev);
1079         struct __ip6_tnl_parm *parm = &tunnel->parms;
1080 
1081         if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) ||
1082             nla_put_in6_addr(skb, IFLA_VTI_LOCAL, &parm->laddr) ||
1083             nla_put_in6_addr(skb, IFLA_VTI_REMOTE, &parm->raddr) ||
1084             nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) ||
1085             nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key) ||
1086             nla_put_u32(skb, IFLA_VTI_FWMARK, parm->fwmark))
1087                 goto nla_put_failure;
1088         return 0;
1089 
1090 nla_put_failure:
1091         return -EMSGSIZE;
1092 }
1093 
1094 static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = {
1095         [IFLA_VTI_LINK]         = { .type = NLA_U32 },
1096         [IFLA_VTI_LOCAL]        = { .len = sizeof(struct in6_addr) },
1097         [IFLA_VTI_REMOTE]       = { .len = sizeof(struct in6_addr) },
1098         [IFLA_VTI_IKEY]         = { .type = NLA_U32 },
1099         [IFLA_VTI_OKEY]         = { .type = NLA_U32 },
1100         [IFLA_VTI_FWMARK]       = { .type = NLA_U32 },
1101 };
1102 
1103 static struct rtnl_link_ops vti6_link_ops __read_mostly = {
1104         .kind           = "vti6",
1105         .maxtype        = IFLA_VTI_MAX,
1106         .policy         = vti6_policy,
1107         .priv_size      = sizeof(struct ip6_tnl),
1108         .setup          = vti6_dev_setup,
1109         .validate       = vti6_validate,
1110         .newlink        = vti6_newlink,
1111         .dellink        = vti6_dellink,
1112         .changelink     = vti6_changelink,
1113         .get_size       = vti6_get_size,
1114         .fill_info      = vti6_fill_info,
1115         .get_link_net   = ip6_tnl_get_link_net,
1116 };
1117 
1118 static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n,
1119                                             struct list_head *list)
1120 {
1121         int h;
1122         struct ip6_tnl *t;
1123 
1124         for (h = 0; h < IP6_VTI_HASH_SIZE; h++) {
1125                 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1126                 while (t) {
1127                         unregister_netdevice_queue(t->dev, list);
1128                         t = rtnl_dereference(t->next);
1129                 }
1130         }
1131 
1132         t = rtnl_dereference(ip6n->tnls_wc[0]);
1133         if (t)
1134                 unregister_netdevice_queue(t->dev, list);
1135 }
1136 
1137 static int __net_init vti6_init_net(struct net *net)
1138 {
1139         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1140         struct ip6_tnl *t = NULL;
1141         int err;
1142 
1143         ip6n->tnls[0] = ip6n->tnls_wc;
1144         ip6n->tnls[1] = ip6n->tnls_r_l;
1145 
1146         if (!net_has_fallback_tunnels(net))
1147                 return 0;
1148         err = -ENOMEM;
1149         ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0",
1150                                         NET_NAME_UNKNOWN, vti6_dev_setup);
1151 
1152         if (!ip6n->fb_tnl_dev)
1153                 goto err_alloc_dev;
1154         dev_net_set(ip6n->fb_tnl_dev, net);
1155         ip6n->fb_tnl_dev->rtnl_link_ops = &vti6_link_ops;
1156 
1157         err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1158         if (err < 0)
1159                 goto err_register;
1160 
1161         err = register_netdev(ip6n->fb_tnl_dev);
1162         if (err < 0)
1163                 goto err_register;
1164 
1165         t = netdev_priv(ip6n->fb_tnl_dev);
1166 
1167         strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1168         return 0;
1169 
1170 err_register:
1171         free_netdev(ip6n->fb_tnl_dev);
1172 err_alloc_dev:
1173         return err;
1174 }
1175 
1176 static void __net_exit vti6_exit_batch_net(struct list_head *net_list)
1177 {
1178         struct vti6_net *ip6n;
1179         struct net *net;
1180         LIST_HEAD(list);
1181 
1182         rtnl_lock();
1183         list_for_each_entry(net, net_list, exit_list) {
1184                 ip6n = net_generic(net, vti6_net_id);
1185                 vti6_destroy_tunnels(ip6n, &list);
1186         }
1187         unregister_netdevice_many(&list);
1188         rtnl_unlock();
1189 }
1190 
1191 static struct pernet_operations vti6_net_ops = {
1192         .init = vti6_init_net,
1193         .exit_batch = vti6_exit_batch_net,
1194         .id   = &vti6_net_id,
1195         .size = sizeof(struct vti6_net),
1196 };
1197 
1198 static struct xfrm6_protocol vti_esp6_protocol __read_mostly = {
1199         .handler        =       vti6_rcv,
1200         .input_handler  =       vti6_input_proto,
1201         .cb_handler     =       vti6_rcv_cb,
1202         .err_handler    =       vti6_err,
1203         .priority       =       100,
1204 };
1205 
1206 static struct xfrm6_protocol vti_ah6_protocol __read_mostly = {
1207         .handler        =       vti6_rcv,
1208         .input_handler  =       vti6_input_proto,
1209         .cb_handler     =       vti6_rcv_cb,
1210         .err_handler    =       vti6_err,
1211         .priority       =       100,
1212 };
1213 
1214 static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = {
1215         .handler        =       vti6_rcv,
1216         .input_handler  =       vti6_input_proto,
1217         .cb_handler     =       vti6_rcv_cb,
1218         .err_handler    =       vti6_err,
1219         .priority       =       100,
1220 };
1221 
1222 /**
1223  * vti6_tunnel_init - register protocol and reserve needed resources
1224  *
1225  * Return: 0 on success
1226  **/
1227 static int __init vti6_tunnel_init(void)
1228 {
1229         const char *msg;
1230         int err;
1231 
1232         msg = "tunnel device";
1233         err = register_pernet_device(&vti6_net_ops);
1234         if (err < 0)
1235                 goto pernet_dev_failed;
1236 
1237         msg = "tunnel protocols";
1238         err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP);
1239         if (err < 0)
1240                 goto xfrm_proto_esp_failed;
1241         err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH);
1242         if (err < 0)
1243                 goto xfrm_proto_ah_failed;
1244         err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP);
1245         if (err < 0)
1246                 goto xfrm_proto_comp_failed;
1247 
1248         msg = "netlink interface";
1249         err = rtnl_link_register(&vti6_link_ops);
1250         if (err < 0)
1251                 goto rtnl_link_failed;
1252 
1253         return 0;
1254 
1255 rtnl_link_failed:
1256         xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1257 xfrm_proto_comp_failed:
1258         xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1259 xfrm_proto_ah_failed:
1260         xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1261 xfrm_proto_esp_failed:
1262         unregister_pernet_device(&vti6_net_ops);
1263 pernet_dev_failed:
1264         pr_err("vti6 init: failed to register %s\n", msg);
1265         return err;
1266 }
1267 
1268 /**
1269  * vti6_tunnel_cleanup - free resources and unregister protocol
1270  **/
1271 static void __exit vti6_tunnel_cleanup(void)
1272 {
1273         rtnl_link_unregister(&vti6_link_ops);
1274         xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1275         xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1276         xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1277         unregister_pernet_device(&vti6_net_ops);
1278 }
1279 
1280 module_init(vti6_tunnel_init);
1281 module_exit(vti6_tunnel_cleanup);
1282 MODULE_LICENSE("GPL");
1283 MODULE_ALIAS_RTNL_LINK("vti6");
1284 MODULE_ALIAS_NETDEV("ip6_vti0");
1285 MODULE_AUTHOR("Steffen Klassert");
1286 MODULE_DESCRIPTION("IPv6 virtual tunnel interface");
1287 

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