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Linux/net/ipv6/ip6_vti.c

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  1 /*
  2  *      IPv6 virtual tunneling interface
  3  *
  4  *      Copyright (C) 2013 secunet Security Networks AG
  5  *
  6  *      Author:
  7  *      Steffen Klassert <steffen.klassert@secunet.com>
  8  *
  9  *      Based on:
 10  *      net/ipv6/ip6_tunnel.c
 11  *
 12  *      This program is free software; you can redistribute it and/or
 13  *      modify it under the terms of the GNU General Public License
 14  *      as published by the Free Software Foundation; either version
 15  *      2 of the License, or (at your option) any later version.
 16  */
 17 
 18 #include <linux/module.h>
 19 #include <linux/capability.h>
 20 #include <linux/errno.h>
 21 #include <linux/types.h>
 22 #include <linux/sockios.h>
 23 #include <linux/icmp.h>
 24 #include <linux/if.h>
 25 #include <linux/in.h>
 26 #include <linux/ip.h>
 27 #include <linux/net.h>
 28 #include <linux/in6.h>
 29 #include <linux/netdevice.h>
 30 #include <linux/if_arp.h>
 31 #include <linux/icmpv6.h>
 32 #include <linux/init.h>
 33 #include <linux/route.h>
 34 #include <linux/rtnetlink.h>
 35 #include <linux/netfilter_ipv6.h>
 36 #include <linux/slab.h>
 37 #include <linux/hash.h>
 38 
 39 #include <linux/uaccess.h>
 40 #include <linux/atomic.h>
 41 
 42 #include <net/icmp.h>
 43 #include <net/ip.h>
 44 #include <net/ip_tunnels.h>
 45 #include <net/ipv6.h>
 46 #include <net/ip6_route.h>
 47 #include <net/addrconf.h>
 48 #include <net/ip6_tunnel.h>
 49 #include <net/xfrm.h>
 50 #include <net/net_namespace.h>
 51 #include <net/netns/generic.h>
 52 #include <linux/etherdevice.h>
 53 
 54 #define IP6_VTI_HASH_SIZE_SHIFT  5
 55 #define IP6_VTI_HASH_SIZE (1 << IP6_VTI_HASH_SIZE_SHIFT)
 56 
 57 static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
 58 {
 59         u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
 60 
 61         return hash_32(hash, IP6_VTI_HASH_SIZE_SHIFT);
 62 }
 63 
 64 static int vti6_dev_init(struct net_device *dev);
 65 static void vti6_dev_setup(struct net_device *dev);
 66 static struct rtnl_link_ops vti6_link_ops __read_mostly;
 67 
 68 static unsigned int vti6_net_id __read_mostly;
 69 struct vti6_net {
 70         /* the vti6 tunnel fallback device */
 71         struct net_device *fb_tnl_dev;
 72         /* lists for storing tunnels in use */
 73         struct ip6_tnl __rcu *tnls_r_l[IP6_VTI_HASH_SIZE];
 74         struct ip6_tnl __rcu *tnls_wc[1];
 75         struct ip6_tnl __rcu **tnls[2];
 76 };
 77 
 78 #define for_each_vti6_tunnel_rcu(start) \
 79         for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
 80 
 81 /**
 82  * vti6_tnl_lookup - fetch tunnel matching the end-point addresses
 83  *   @net: network namespace
 84  *   @remote: the address of the tunnel exit-point
 85  *   @local: the address of the tunnel entry-point
 86  *
 87  * Return:
 88  *   tunnel matching given end-points if found,
 89  *   else fallback tunnel if its device is up,
 90  *   else %NULL
 91  **/
 92 static struct ip6_tnl *
 93 vti6_tnl_lookup(struct net *net, const struct in6_addr *remote,
 94                 const struct in6_addr *local)
 95 {
 96         unsigned int hash = HASH(remote, local);
 97         struct ip6_tnl *t;
 98         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
 99         struct in6_addr any;
100 
101         for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
102                 if (ipv6_addr_equal(local, &t->parms.laddr) &&
103                     ipv6_addr_equal(remote, &t->parms.raddr) &&
104                     (t->dev->flags & IFF_UP))
105                         return t;
106         }
107 
108         memset(&any, 0, sizeof(any));
109         hash = HASH(&any, local);
110         for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
111                 if (ipv6_addr_equal(local, &t->parms.laddr) &&
112                     (t->dev->flags & IFF_UP))
113                         return t;
114         }
115 
116         hash = HASH(remote, &any);
117         for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
118                 if (ipv6_addr_equal(remote, &t->parms.raddr) &&
119                     (t->dev->flags & IFF_UP))
120                         return t;
121         }
122 
123         t = rcu_dereference(ip6n->tnls_wc[0]);
124         if (t && (t->dev->flags & IFF_UP))
125                 return t;
126 
127         return NULL;
128 }
129 
130 /**
131  * vti6_tnl_bucket - get head of list matching given tunnel parameters
132  *   @p: parameters containing tunnel end-points
133  *
134  * Description:
135  *   vti6_tnl_bucket() returns the head of the list matching the
136  *   &struct in6_addr entries laddr and raddr in @p.
137  *
138  * Return: head of IPv6 tunnel list
139  **/
140 static struct ip6_tnl __rcu **
141 vti6_tnl_bucket(struct vti6_net *ip6n, const struct __ip6_tnl_parm *p)
142 {
143         const struct in6_addr *remote = &p->raddr;
144         const struct in6_addr *local = &p->laddr;
145         unsigned int h = 0;
146         int prio = 0;
147 
148         if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
149                 prio = 1;
150                 h = HASH(remote, local);
151         }
152         return &ip6n->tnls[prio][h];
153 }
154 
155 static void
156 vti6_tnl_link(struct vti6_net *ip6n, struct ip6_tnl *t)
157 {
158         struct ip6_tnl __rcu **tp = vti6_tnl_bucket(ip6n, &t->parms);
159 
160         rcu_assign_pointer(t->next , rtnl_dereference(*tp));
161         rcu_assign_pointer(*tp, t);
162 }
163 
164 static void
165 vti6_tnl_unlink(struct vti6_net *ip6n, struct ip6_tnl *t)
166 {
167         struct ip6_tnl __rcu **tp;
168         struct ip6_tnl *iter;
169 
170         for (tp = vti6_tnl_bucket(ip6n, &t->parms);
171              (iter = rtnl_dereference(*tp)) != NULL;
172              tp = &iter->next) {
173                 if (t == iter) {
174                         rcu_assign_pointer(*tp, t->next);
175                         break;
176                 }
177         }
178 }
179 
180 static void vti6_dev_free(struct net_device *dev)
181 {
182         free_percpu(dev->tstats);
183 }
184 
185 static int vti6_tnl_create2(struct net_device *dev)
186 {
187         struct ip6_tnl *t = netdev_priv(dev);
188         struct net *net = dev_net(dev);
189         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
190         int err;
191 
192         dev->rtnl_link_ops = &vti6_link_ops;
193         err = register_netdevice(dev);
194         if (err < 0)
195                 goto out;
196 
197         strcpy(t->parms.name, dev->name);
198 
199         dev_hold(dev);
200         vti6_tnl_link(ip6n, t);
201 
202         return 0;
203 
204 out:
205         return err;
206 }
207 
208 static struct ip6_tnl *vti6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
209 {
210         struct net_device *dev;
211         struct ip6_tnl *t;
212         char name[IFNAMSIZ];
213         int err;
214 
215         if (p->name[0]) {
216                 if (!dev_valid_name(p->name))
217                         goto failed;
218                 strlcpy(name, p->name, IFNAMSIZ);
219         } else {
220                 sprintf(name, "ip6_vti%%d");
221         }
222 
223         dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, vti6_dev_setup);
224         if (!dev)
225                 goto failed;
226 
227         dev_net_set(dev, net);
228 
229         t = netdev_priv(dev);
230         t->parms = *p;
231         t->net = dev_net(dev);
232 
233         err = vti6_tnl_create2(dev);
234         if (err < 0)
235                 goto failed_free;
236 
237         return t;
238 
239 failed_free:
240         free_netdev(dev);
241 failed:
242         return NULL;
243 }
244 
245 /**
246  * vti6_locate - find or create tunnel matching given parameters
247  *   @net: network namespace
248  *   @p: tunnel parameters
249  *   @create: != 0 if allowed to create new tunnel if no match found
250  *
251  * Description:
252  *   vti6_locate() first tries to locate an existing tunnel
253  *   based on @parms. If this is unsuccessful, but @create is set a new
254  *   tunnel device is created and registered for use.
255  *
256  * Return:
257  *   matching tunnel or NULL
258  **/
259 static struct ip6_tnl *vti6_locate(struct net *net, struct __ip6_tnl_parm *p,
260                                    int create)
261 {
262         const struct in6_addr *remote = &p->raddr;
263         const struct in6_addr *local = &p->laddr;
264         struct ip6_tnl __rcu **tp;
265         struct ip6_tnl *t;
266         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
267 
268         for (tp = vti6_tnl_bucket(ip6n, p);
269              (t = rtnl_dereference(*tp)) != NULL;
270              tp = &t->next) {
271                 if (ipv6_addr_equal(local, &t->parms.laddr) &&
272                     ipv6_addr_equal(remote, &t->parms.raddr)) {
273                         if (create)
274                                 return NULL;
275 
276                         return t;
277                 }
278         }
279         if (!create)
280                 return NULL;
281         return vti6_tnl_create(net, p);
282 }
283 
284 /**
285  * vti6_dev_uninit - tunnel device uninitializer
286  *   @dev: the device to be destroyed
287  *
288  * Description:
289  *   vti6_dev_uninit() removes tunnel from its list
290  **/
291 static void vti6_dev_uninit(struct net_device *dev)
292 {
293         struct ip6_tnl *t = netdev_priv(dev);
294         struct vti6_net *ip6n = net_generic(t->net, vti6_net_id);
295 
296         if (dev == ip6n->fb_tnl_dev)
297                 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
298         else
299                 vti6_tnl_unlink(ip6n, t);
300         dev_put(dev);
301 }
302 
303 static int vti6_rcv(struct sk_buff *skb)
304 {
305         struct ip6_tnl *t;
306         const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
307 
308         rcu_read_lock();
309         t = vti6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
310         if (t) {
311                 if (t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) {
312                         rcu_read_unlock();
313                         goto discard;
314                 }
315 
316                 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
317                         rcu_read_unlock();
318                         return 0;
319                 }
320 
321                 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
322                         t->dev->stats.rx_dropped++;
323                         rcu_read_unlock();
324                         goto discard;
325                 }
326 
327                 rcu_read_unlock();
328 
329                 return xfrm6_rcv_tnl(skb, t);
330         }
331         rcu_read_unlock();
332         return -EINVAL;
333 discard:
334         kfree_skb(skb);
335         return 0;
336 }
337 
338 static int vti6_rcv_cb(struct sk_buff *skb, int err)
339 {
340         unsigned short family;
341         struct net_device *dev;
342         struct pcpu_sw_netstats *tstats;
343         struct xfrm_state *x;
344         struct xfrm_mode *inner_mode;
345         struct ip6_tnl *t = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6;
346         u32 orig_mark = skb->mark;
347         int ret;
348 
349         if (!t)
350                 return 1;
351 
352         dev = t->dev;
353 
354         if (err) {
355                 dev->stats.rx_errors++;
356                 dev->stats.rx_dropped++;
357 
358                 return 0;
359         }
360 
361         x = xfrm_input_state(skb);
362 
363         inner_mode = x->inner_mode;
364 
365         if (x->sel.family == AF_UNSPEC) {
366                 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
367                 if (inner_mode == NULL) {
368                         XFRM_INC_STATS(dev_net(skb->dev),
369                                        LINUX_MIB_XFRMINSTATEMODEERROR);
370                         return -EINVAL;
371                 }
372         }
373 
374         family = inner_mode->afinfo->family;
375 
376         skb->mark = be32_to_cpu(t->parms.i_key);
377         ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);
378         skb->mark = orig_mark;
379 
380         if (!ret)
381                 return -EPERM;
382 
383         skb_scrub_packet(skb, !net_eq(t->net, dev_net(skb->dev)));
384         skb->dev = dev;
385 
386         tstats = this_cpu_ptr(dev->tstats);
387         u64_stats_update_begin(&tstats->syncp);
388         tstats->rx_packets++;
389         tstats->rx_bytes += skb->len;
390         u64_stats_update_end(&tstats->syncp);
391 
392         return 0;
393 }
394 
395 /**
396  * vti6_addr_conflict - compare packet addresses to tunnel's own
397  *   @t: the outgoing tunnel device
398  *   @hdr: IPv6 header from the incoming packet
399  *
400  * Description:
401  *   Avoid trivial tunneling loop by checking that tunnel exit-point
402  *   doesn't match source of incoming packet.
403  *
404  * Return:
405  *   1 if conflict,
406  *   0 else
407  **/
408 static inline bool
409 vti6_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
410 {
411         return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
412 }
413 
414 static bool vti6_state_check(const struct xfrm_state *x,
415                              const struct in6_addr *dst,
416                              const struct in6_addr *src)
417 {
418         xfrm_address_t *daddr = (xfrm_address_t *)dst;
419         xfrm_address_t *saddr = (xfrm_address_t *)src;
420 
421         /* if there is no transform then this tunnel is not functional.
422          * Or if the xfrm is not mode tunnel.
423          */
424         if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
425             x->props.family != AF_INET6)
426                 return false;
427 
428         if (ipv6_addr_any(dst))
429                 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET6);
430 
431         if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET6))
432                 return false;
433 
434         return true;
435 }
436 
437 /**
438  * vti6_xmit - send a packet
439  *   @skb: the outgoing socket buffer
440  *   @dev: the outgoing tunnel device
441  *   @fl: the flow informations for the xfrm_lookup
442  **/
443 static int
444 vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
445 {
446         struct ip6_tnl *t = netdev_priv(dev);
447         struct net_device_stats *stats = &t->dev->stats;
448         struct dst_entry *dst = skb_dst(skb);
449         struct net_device *tdev;
450         struct xfrm_state *x;
451         int pkt_len = skb->len;
452         int err = -1;
453         int mtu;
454 
455         if (!dst)
456                 goto tx_err_link_failure;
457 
458         dst_hold(dst);
459         dst = xfrm_lookup(t->net, dst, fl, NULL, 0);
460         if (IS_ERR(dst)) {
461                 err = PTR_ERR(dst);
462                 dst = NULL;
463                 goto tx_err_link_failure;
464         }
465 
466         x = dst->xfrm;
467         if (!vti6_state_check(x, &t->parms.raddr, &t->parms.laddr))
468                 goto tx_err_link_failure;
469 
470         if (!ip6_tnl_xmit_ctl(t, (const struct in6_addr *)&x->props.saddr,
471                               (const struct in6_addr *)&x->id.daddr))
472                 goto tx_err_link_failure;
473 
474         tdev = dst->dev;
475 
476         if (tdev == dev) {
477                 stats->collisions++;
478                 net_warn_ratelimited("%s: Local routing loop detected!\n",
479                                      t->parms.name);
480                 goto tx_err_dst_release;
481         }
482 
483         mtu = dst_mtu(dst);
484         if (skb->len > mtu) {
485                 skb_dst_update_pmtu(skb, mtu);
486 
487                 if (skb->protocol == htons(ETH_P_IPV6)) {
488                         if (mtu < IPV6_MIN_MTU)
489                                 mtu = IPV6_MIN_MTU;
490 
491                         icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
492                 } else {
493                         icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
494                                   htonl(mtu));
495                 }
496 
497                 err = -EMSGSIZE;
498                 goto tx_err_dst_release;
499         }
500 
501         skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
502         skb_dst_set(skb, dst);
503         skb->dev = skb_dst(skb)->dev;
504 
505         err = dst_output(t->net, skb->sk, skb);
506         if (net_xmit_eval(err) == 0) {
507                 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
508 
509                 u64_stats_update_begin(&tstats->syncp);
510                 tstats->tx_bytes += pkt_len;
511                 tstats->tx_packets++;
512                 u64_stats_update_end(&tstats->syncp);
513         } else {
514                 stats->tx_errors++;
515                 stats->tx_aborted_errors++;
516         }
517 
518         return 0;
519 tx_err_link_failure:
520         stats->tx_carrier_errors++;
521         dst_link_failure(skb);
522 tx_err_dst_release:
523         dst_release(dst);
524         return err;
525 }
526 
527 static netdev_tx_t
528 vti6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
529 {
530         struct ip6_tnl *t = netdev_priv(dev);
531         struct net_device_stats *stats = &t->dev->stats;
532         struct ipv6hdr *ipv6h;
533         struct flowi fl;
534         int ret;
535 
536         memset(&fl, 0, sizeof(fl));
537 
538         switch (skb->protocol) {
539         case htons(ETH_P_IPV6):
540                 ipv6h = ipv6_hdr(skb);
541 
542                 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
543                     vti6_addr_conflict(t, ipv6h))
544                         goto tx_err;
545 
546                 xfrm_decode_session(skb, &fl, AF_INET6);
547                 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
548                 break;
549         case htons(ETH_P_IP):
550                 xfrm_decode_session(skb, &fl, AF_INET);
551                 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
552                 break;
553         default:
554                 goto tx_err;
555         }
556 
557         /* override mark with tunnel output key */
558         fl.flowi_mark = be32_to_cpu(t->parms.o_key);
559 
560         ret = vti6_xmit(skb, dev, &fl);
561         if (ret < 0)
562                 goto tx_err;
563 
564         return NETDEV_TX_OK;
565 
566 tx_err:
567         stats->tx_errors++;
568         stats->tx_dropped++;
569         kfree_skb(skb);
570         return NETDEV_TX_OK;
571 }
572 
573 static int vti6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
574                     u8 type, u8 code, int offset, __be32 info)
575 {
576         __be32 spi;
577         __u32 mark;
578         struct xfrm_state *x;
579         struct ip6_tnl *t;
580         struct ip_esp_hdr *esph;
581         struct ip_auth_hdr *ah;
582         struct ip_comp_hdr *ipch;
583         struct net *net = dev_net(skb->dev);
584         const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
585         int protocol = iph->nexthdr;
586 
587         t = vti6_tnl_lookup(dev_net(skb->dev), &iph->daddr, &iph->saddr);
588         if (!t)
589                 return -1;
590 
591         mark = be32_to_cpu(t->parms.o_key);
592 
593         switch (protocol) {
594         case IPPROTO_ESP:
595                 esph = (struct ip_esp_hdr *)(skb->data + offset);
596                 spi = esph->spi;
597                 break;
598         case IPPROTO_AH:
599                 ah = (struct ip_auth_hdr *)(skb->data + offset);
600                 spi = ah->spi;
601                 break;
602         case IPPROTO_COMP:
603                 ipch = (struct ip_comp_hdr *)(skb->data + offset);
604                 spi = htonl(ntohs(ipch->cpi));
605                 break;
606         default:
607                 return 0;
608         }
609 
610         if (type != ICMPV6_PKT_TOOBIG &&
611             type != NDISC_REDIRECT)
612                 return 0;
613 
614         x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
615                               spi, protocol, AF_INET6);
616         if (!x)
617                 return 0;
618 
619         if (type == NDISC_REDIRECT)
620                 ip6_redirect(skb, net, skb->dev->ifindex, 0,
621                              sock_net_uid(net, NULL));
622         else
623                 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
624         xfrm_state_put(x);
625 
626         return 0;
627 }
628 
629 static void vti6_link_config(struct ip6_tnl *t, bool keep_mtu)
630 {
631         struct net_device *dev = t->dev;
632         struct __ip6_tnl_parm *p = &t->parms;
633         struct net_device *tdev = NULL;
634         int mtu;
635 
636         memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
637         memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
638 
639         p->flags &= ~(IP6_TNL_F_CAP_XMIT | IP6_TNL_F_CAP_RCV |
640                       IP6_TNL_F_CAP_PER_PACKET);
641         p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
642 
643         if (p->flags & IP6_TNL_F_CAP_XMIT && p->flags & IP6_TNL_F_CAP_RCV)
644                 dev->flags |= IFF_POINTOPOINT;
645         else
646                 dev->flags &= ~IFF_POINTOPOINT;
647 
648         if (keep_mtu && dev->mtu) {
649                 dev->mtu = clamp(dev->mtu, dev->min_mtu, dev->max_mtu);
650                 return;
651         }
652 
653         if (p->flags & IP6_TNL_F_CAP_XMIT) {
654                 int strict = (ipv6_addr_type(&p->raddr) &
655                               (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL));
656                 struct rt6_info *rt = rt6_lookup(t->net,
657                                                  &p->raddr, &p->laddr,
658                                                  p->link, NULL, strict);
659 
660                 if (rt)
661                         tdev = rt->dst.dev;
662                 ip6_rt_put(rt);
663         }
664 
665         if (!tdev && p->link)
666                 tdev = __dev_get_by_index(t->net, p->link);
667 
668         if (tdev)
669                 mtu = tdev->mtu - sizeof(struct ipv6hdr);
670         else
671                 mtu = ETH_DATA_LEN - LL_MAX_HEADER - sizeof(struct ipv6hdr);
672 
673         dev->mtu = max_t(int, mtu, IPV4_MIN_MTU);
674 }
675 
676 /**
677  * vti6_tnl_change - update the tunnel parameters
678  *   @t: tunnel to be changed
679  *   @p: tunnel configuration parameters
680  *   @keep_mtu: MTU was set from userspace, don't re-compute it
681  *
682  * Description:
683  *   vti6_tnl_change() updates the tunnel parameters
684  **/
685 static int
686 vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
687                 bool keep_mtu)
688 {
689         t->parms.laddr = p->laddr;
690         t->parms.raddr = p->raddr;
691         t->parms.link = p->link;
692         t->parms.i_key = p->i_key;
693         t->parms.o_key = p->o_key;
694         t->parms.proto = p->proto;
695         t->parms.fwmark = p->fwmark;
696         dst_cache_reset(&t->dst_cache);
697         vti6_link_config(t, keep_mtu);
698         return 0;
699 }
700 
701 static int vti6_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p,
702                        bool keep_mtu)
703 {
704         struct net *net = dev_net(t->dev);
705         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
706         int err;
707 
708         vti6_tnl_unlink(ip6n, t);
709         synchronize_net();
710         err = vti6_tnl_change(t, p, keep_mtu);
711         vti6_tnl_link(ip6n, t);
712         netdev_state_change(t->dev);
713         return err;
714 }
715 
716 static void
717 vti6_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u)
718 {
719         p->laddr = u->laddr;
720         p->raddr = u->raddr;
721         p->link = u->link;
722         p->i_key = u->i_key;
723         p->o_key = u->o_key;
724         p->proto = u->proto;
725 
726         memcpy(p->name, u->name, sizeof(u->name));
727 }
728 
729 static void
730 vti6_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p)
731 {
732         u->laddr = p->laddr;
733         u->raddr = p->raddr;
734         u->link = p->link;
735         u->i_key = p->i_key;
736         u->o_key = p->o_key;
737         if (u->i_key)
738                 u->i_flags |= GRE_KEY;
739         if (u->o_key)
740                 u->o_flags |= GRE_KEY;
741         u->proto = p->proto;
742 
743         memcpy(u->name, p->name, sizeof(u->name));
744 }
745 
746 /**
747  * vti6_ioctl - configure vti6 tunnels from userspace
748  *   @dev: virtual device associated with tunnel
749  *   @ifr: parameters passed from userspace
750  *   @cmd: command to be performed
751  *
752  * Description:
753  *   vti6_ioctl() is used for managing vti6 tunnels
754  *   from userspace.
755  *
756  *   The possible commands are the following:
757  *     %SIOCGETTUNNEL: get tunnel parameters for device
758  *     %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
759  *     %SIOCCHGTUNNEL: change tunnel parameters to those given
760  *     %SIOCDELTUNNEL: delete tunnel
761  *
762  *   The fallback device "ip6_vti0", created during module
763  *   initialization, can be used for creating other tunnel devices.
764  *
765  * Return:
766  *   0 on success,
767  *   %-EFAULT if unable to copy data to or from userspace,
768  *   %-EPERM if current process hasn't %CAP_NET_ADMIN set
769  *   %-EINVAL if passed tunnel parameters are invalid,
770  *   %-EEXIST if changing a tunnel's parameters would cause a conflict
771  *   %-ENODEV if attempting to change or delete a nonexisting device
772  **/
773 static int
774 vti6_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
775 {
776         int err = 0;
777         struct ip6_tnl_parm2 p;
778         struct __ip6_tnl_parm p1;
779         struct ip6_tnl *t = NULL;
780         struct net *net = dev_net(dev);
781         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
782 
783         switch (cmd) {
784         case SIOCGETTUNNEL:
785                 if (dev == ip6n->fb_tnl_dev) {
786                         if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
787                                 err = -EFAULT;
788                                 break;
789                         }
790                         vti6_parm_from_user(&p1, &p);
791                         t = vti6_locate(net, &p1, 0);
792                 } else {
793                         memset(&p, 0, sizeof(p));
794                 }
795                 if (!t)
796                         t = netdev_priv(dev);
797                 vti6_parm_to_user(&p, &t->parms);
798                 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
799                         err = -EFAULT;
800                 break;
801         case SIOCADDTUNNEL:
802         case SIOCCHGTUNNEL:
803                 err = -EPERM;
804                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
805                         break;
806                 err = -EFAULT;
807                 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
808                         break;
809                 err = -EINVAL;
810                 if (p.proto != IPPROTO_IPV6  && p.proto != 0)
811                         break;
812                 vti6_parm_from_user(&p1, &p);
813                 t = vti6_locate(net, &p1, cmd == SIOCADDTUNNEL);
814                 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
815                         if (t) {
816                                 if (t->dev != dev) {
817                                         err = -EEXIST;
818                                         break;
819                                 }
820                         } else
821                                 t = netdev_priv(dev);
822 
823                         err = vti6_update(t, &p1, false);
824                 }
825                 if (t) {
826                         err = 0;
827                         vti6_parm_to_user(&p, &t->parms);
828                         if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
829                                 err = -EFAULT;
830 
831                 } else
832                         err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
833                 break;
834         case SIOCDELTUNNEL:
835                 err = -EPERM;
836                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
837                         break;
838 
839                 if (dev == ip6n->fb_tnl_dev) {
840                         err = -EFAULT;
841                         if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
842                                 break;
843                         err = -ENOENT;
844                         vti6_parm_from_user(&p1, &p);
845                         t = vti6_locate(net, &p1, 0);
846                         if (!t)
847                                 break;
848                         err = -EPERM;
849                         if (t->dev == ip6n->fb_tnl_dev)
850                                 break;
851                         dev = t->dev;
852                 }
853                 err = 0;
854                 unregister_netdevice(dev);
855                 break;
856         default:
857                 err = -EINVAL;
858         }
859         return err;
860 }
861 
862 static const struct net_device_ops vti6_netdev_ops = {
863         .ndo_init       = vti6_dev_init,
864         .ndo_uninit     = vti6_dev_uninit,
865         .ndo_start_xmit = vti6_tnl_xmit,
866         .ndo_do_ioctl   = vti6_ioctl,
867         .ndo_get_stats64 = ip_tunnel_get_stats64,
868         .ndo_get_iflink = ip6_tnl_get_iflink,
869 };
870 
871 /**
872  * vti6_dev_setup - setup virtual tunnel device
873  *   @dev: virtual device associated with tunnel
874  *
875  * Description:
876  *   Initialize function pointers and device parameters
877  **/
878 static void vti6_dev_setup(struct net_device *dev)
879 {
880         dev->netdev_ops = &vti6_netdev_ops;
881         dev->needs_free_netdev = true;
882         dev->priv_destructor = vti6_dev_free;
883 
884         dev->type = ARPHRD_TUNNEL6;
885         dev->min_mtu = IPV4_MIN_MTU;
886         dev->max_mtu = IP_MAX_MTU - sizeof(struct ipv6hdr);
887         dev->flags |= IFF_NOARP;
888         dev->addr_len = sizeof(struct in6_addr);
889         netif_keep_dst(dev);
890         /* This perm addr will be used as interface identifier by IPv6 */
891         dev->addr_assign_type = NET_ADDR_RANDOM;
892         eth_random_addr(dev->perm_addr);
893 }
894 
895 /**
896  * vti6_dev_init_gen - general initializer for all tunnel devices
897  *   @dev: virtual device associated with tunnel
898  **/
899 static inline int vti6_dev_init_gen(struct net_device *dev)
900 {
901         struct ip6_tnl *t = netdev_priv(dev);
902 
903         t->dev = dev;
904         t->net = dev_net(dev);
905         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
906         if (!dev->tstats)
907                 return -ENOMEM;
908         return 0;
909 }
910 
911 /**
912  * vti6_dev_init - initializer for all non fallback tunnel devices
913  *   @dev: virtual device associated with tunnel
914  **/
915 static int vti6_dev_init(struct net_device *dev)
916 {
917         struct ip6_tnl *t = netdev_priv(dev);
918         int err = vti6_dev_init_gen(dev);
919 
920         if (err)
921                 return err;
922         vti6_link_config(t, true);
923         return 0;
924 }
925 
926 /**
927  * vti6_fb_tnl_dev_init - initializer for fallback tunnel device
928  *   @dev: fallback device
929  *
930  * Return: 0
931  **/
932 static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev)
933 {
934         struct ip6_tnl *t = netdev_priv(dev);
935         struct net *net = dev_net(dev);
936         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
937 
938         t->parms.proto = IPPROTO_IPV6;
939         dev_hold(dev);
940 
941         rcu_assign_pointer(ip6n->tnls_wc[0], t);
942         return 0;
943 }
944 
945 static int vti6_validate(struct nlattr *tb[], struct nlattr *data[],
946                          struct netlink_ext_ack *extack)
947 {
948         return 0;
949 }
950 
951 static void vti6_netlink_parms(struct nlattr *data[],
952                                struct __ip6_tnl_parm *parms)
953 {
954         memset(parms, 0, sizeof(*parms));
955 
956         if (!data)
957                 return;
958 
959         if (data[IFLA_VTI_LINK])
960                 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
961 
962         if (data[IFLA_VTI_LOCAL])
963                 parms->laddr = nla_get_in6_addr(data[IFLA_VTI_LOCAL]);
964 
965         if (data[IFLA_VTI_REMOTE])
966                 parms->raddr = nla_get_in6_addr(data[IFLA_VTI_REMOTE]);
967 
968         if (data[IFLA_VTI_IKEY])
969                 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
970 
971         if (data[IFLA_VTI_OKEY])
972                 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
973 
974         if (data[IFLA_VTI_FWMARK])
975                 parms->fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]);
976 }
977 
978 static int vti6_newlink(struct net *src_net, struct net_device *dev,
979                         struct nlattr *tb[], struct nlattr *data[],
980                         struct netlink_ext_ack *extack)
981 {
982         struct net *net = dev_net(dev);
983         struct ip6_tnl *nt;
984 
985         nt = netdev_priv(dev);
986         vti6_netlink_parms(data, &nt->parms);
987 
988         nt->parms.proto = IPPROTO_IPV6;
989 
990         if (vti6_locate(net, &nt->parms, 0))
991                 return -EEXIST;
992 
993         return vti6_tnl_create2(dev);
994 }
995 
996 static void vti6_dellink(struct net_device *dev, struct list_head *head)
997 {
998         struct net *net = dev_net(dev);
999         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1000 
1001         if (dev != ip6n->fb_tnl_dev)
1002                 unregister_netdevice_queue(dev, head);
1003 }
1004 
1005 static int vti6_changelink(struct net_device *dev, struct nlattr *tb[],
1006                            struct nlattr *data[],
1007                            struct netlink_ext_ack *extack)
1008 {
1009         struct ip6_tnl *t;
1010         struct __ip6_tnl_parm p;
1011         struct net *net = dev_net(dev);
1012         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1013 
1014         if (dev == ip6n->fb_tnl_dev)
1015                 return -EINVAL;
1016 
1017         vti6_netlink_parms(data, &p);
1018 
1019         t = vti6_locate(net, &p, 0);
1020 
1021         if (t) {
1022                 if (t->dev != dev)
1023                         return -EEXIST;
1024         } else
1025                 t = netdev_priv(dev);
1026 
1027         return vti6_update(t, &p, tb && tb[IFLA_MTU]);
1028 }
1029 
1030 static size_t vti6_get_size(const struct net_device *dev)
1031 {
1032         return
1033                 /* IFLA_VTI_LINK */
1034                 nla_total_size(4) +
1035                 /* IFLA_VTI_LOCAL */
1036                 nla_total_size(sizeof(struct in6_addr)) +
1037                 /* IFLA_VTI_REMOTE */
1038                 nla_total_size(sizeof(struct in6_addr)) +
1039                 /* IFLA_VTI_IKEY */
1040                 nla_total_size(4) +
1041                 /* IFLA_VTI_OKEY */
1042                 nla_total_size(4) +
1043                 /* IFLA_VTI_FWMARK */
1044                 nla_total_size(4) +
1045                 0;
1046 }
1047 
1048 static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1049 {
1050         struct ip6_tnl *tunnel = netdev_priv(dev);
1051         struct __ip6_tnl_parm *parm = &tunnel->parms;
1052 
1053         if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) ||
1054             nla_put_in6_addr(skb, IFLA_VTI_LOCAL, &parm->laddr) ||
1055             nla_put_in6_addr(skb, IFLA_VTI_REMOTE, &parm->raddr) ||
1056             nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) ||
1057             nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key) ||
1058             nla_put_u32(skb, IFLA_VTI_FWMARK, parm->fwmark))
1059                 goto nla_put_failure;
1060         return 0;
1061 
1062 nla_put_failure:
1063         return -EMSGSIZE;
1064 }
1065 
1066 static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = {
1067         [IFLA_VTI_LINK]         = { .type = NLA_U32 },
1068         [IFLA_VTI_LOCAL]        = { .len = sizeof(struct in6_addr) },
1069         [IFLA_VTI_REMOTE]       = { .len = sizeof(struct in6_addr) },
1070         [IFLA_VTI_IKEY]         = { .type = NLA_U32 },
1071         [IFLA_VTI_OKEY]         = { .type = NLA_U32 },
1072         [IFLA_VTI_FWMARK]       = { .type = NLA_U32 },
1073 };
1074 
1075 static struct rtnl_link_ops vti6_link_ops __read_mostly = {
1076         .kind           = "vti6",
1077         .maxtype        = IFLA_VTI_MAX,
1078         .policy         = vti6_policy,
1079         .priv_size      = sizeof(struct ip6_tnl),
1080         .setup          = vti6_dev_setup,
1081         .validate       = vti6_validate,
1082         .newlink        = vti6_newlink,
1083         .dellink        = vti6_dellink,
1084         .changelink     = vti6_changelink,
1085         .get_size       = vti6_get_size,
1086         .fill_info      = vti6_fill_info,
1087         .get_link_net   = ip6_tnl_get_link_net,
1088 };
1089 
1090 static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n,
1091                                             struct list_head *list)
1092 {
1093         int h;
1094         struct ip6_tnl *t;
1095 
1096         for (h = 0; h < IP6_VTI_HASH_SIZE; h++) {
1097                 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1098                 while (t) {
1099                         unregister_netdevice_queue(t->dev, list);
1100                         t = rtnl_dereference(t->next);
1101                 }
1102         }
1103 
1104         t = rtnl_dereference(ip6n->tnls_wc[0]);
1105         if (t)
1106                 unregister_netdevice_queue(t->dev, list);
1107 }
1108 
1109 static int __net_init vti6_init_net(struct net *net)
1110 {
1111         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1112         struct ip6_tnl *t = NULL;
1113         int err;
1114 
1115         ip6n->tnls[0] = ip6n->tnls_wc;
1116         ip6n->tnls[1] = ip6n->tnls_r_l;
1117 
1118         if (!net_has_fallback_tunnels(net))
1119                 return 0;
1120         err = -ENOMEM;
1121         ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0",
1122                                         NET_NAME_UNKNOWN, vti6_dev_setup);
1123 
1124         if (!ip6n->fb_tnl_dev)
1125                 goto err_alloc_dev;
1126         dev_net_set(ip6n->fb_tnl_dev, net);
1127         ip6n->fb_tnl_dev->rtnl_link_ops = &vti6_link_ops;
1128 
1129         err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1130         if (err < 0)
1131                 goto err_register;
1132 
1133         err = register_netdev(ip6n->fb_tnl_dev);
1134         if (err < 0)
1135                 goto err_register;
1136 
1137         t = netdev_priv(ip6n->fb_tnl_dev);
1138 
1139         strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1140         return 0;
1141 
1142 err_register:
1143         free_netdev(ip6n->fb_tnl_dev);
1144 err_alloc_dev:
1145         return err;
1146 }
1147 
1148 static void __net_exit vti6_exit_batch_net(struct list_head *net_list)
1149 {
1150         struct vti6_net *ip6n;
1151         struct net *net;
1152         LIST_HEAD(list);
1153 
1154         rtnl_lock();
1155         list_for_each_entry(net, net_list, exit_list) {
1156                 ip6n = net_generic(net, vti6_net_id);
1157                 vti6_destroy_tunnels(ip6n, &list);
1158         }
1159         unregister_netdevice_many(&list);
1160         rtnl_unlock();
1161 }
1162 
1163 static struct pernet_operations vti6_net_ops = {
1164         .init = vti6_init_net,
1165         .exit_batch = vti6_exit_batch_net,
1166         .id   = &vti6_net_id,
1167         .size = sizeof(struct vti6_net),
1168 };
1169 
1170 static struct xfrm6_protocol vti_esp6_protocol __read_mostly = {
1171         .handler        =       vti6_rcv,
1172         .cb_handler     =       vti6_rcv_cb,
1173         .err_handler    =       vti6_err,
1174         .priority       =       100,
1175 };
1176 
1177 static struct xfrm6_protocol vti_ah6_protocol __read_mostly = {
1178         .handler        =       vti6_rcv,
1179         .cb_handler     =       vti6_rcv_cb,
1180         .err_handler    =       vti6_err,
1181         .priority       =       100,
1182 };
1183 
1184 static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = {
1185         .handler        =       vti6_rcv,
1186         .cb_handler     =       vti6_rcv_cb,
1187         .err_handler    =       vti6_err,
1188         .priority       =       100,
1189 };
1190 
1191 /**
1192  * vti6_tunnel_init - register protocol and reserve needed resources
1193  *
1194  * Return: 0 on success
1195  **/
1196 static int __init vti6_tunnel_init(void)
1197 {
1198         const char *msg;
1199         int err;
1200 
1201         msg = "tunnel device";
1202         err = register_pernet_device(&vti6_net_ops);
1203         if (err < 0)
1204                 goto pernet_dev_failed;
1205 
1206         msg = "tunnel protocols";
1207         err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP);
1208         if (err < 0)
1209                 goto xfrm_proto_esp_failed;
1210         err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH);
1211         if (err < 0)
1212                 goto xfrm_proto_ah_failed;
1213         err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP);
1214         if (err < 0)
1215                 goto xfrm_proto_comp_failed;
1216 
1217         msg = "netlink interface";
1218         err = rtnl_link_register(&vti6_link_ops);
1219         if (err < 0)
1220                 goto rtnl_link_failed;
1221 
1222         return 0;
1223 
1224 rtnl_link_failed:
1225         xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1226 xfrm_proto_comp_failed:
1227         xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1228 xfrm_proto_ah_failed:
1229         xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1230 xfrm_proto_esp_failed:
1231         unregister_pernet_device(&vti6_net_ops);
1232 pernet_dev_failed:
1233         pr_err("vti6 init: failed to register %s\n", msg);
1234         return err;
1235 }
1236 
1237 /**
1238  * vti6_tunnel_cleanup - free resources and unregister protocol
1239  **/
1240 static void __exit vti6_tunnel_cleanup(void)
1241 {
1242         rtnl_link_unregister(&vti6_link_ops);
1243         xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1244         xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1245         xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1246         unregister_pernet_device(&vti6_net_ops);
1247 }
1248 
1249 module_init(vti6_tunnel_init);
1250 module_exit(vti6_tunnel_cleanup);
1251 MODULE_LICENSE("GPL");
1252 MODULE_ALIAS_RTNL_LINK("vti6");
1253 MODULE_ALIAS_NETDEV("ip6_vti0");
1254 MODULE_AUTHOR("Steffen Klassert");
1255 MODULE_DESCRIPTION("IPv6 virtual tunnel interface");
1256 

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