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TOMOYO Linux Cross Reference
Linux/net/ipv6/ip6_gre.c

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  1 /*
  2  *      GRE over IPv6 protocol decoder.
  3  *
  4  *      Authors: Dmitry Kozlov (xeb@mail.ru)
  5  *
  6  *      This program is free software; you can redistribute it and/or
  7  *      modify it under the terms of the GNU General Public License
  8  *      as published by the Free Software Foundation; either version
  9  *      2 of the License, or (at your option) any later version.
 10  *
 11  */
 12 
 13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 14 
 15 #include <linux/capability.h>
 16 #include <linux/module.h>
 17 #include <linux/types.h>
 18 #include <linux/kernel.h>
 19 #include <linux/slab.h>
 20 #include <linux/uaccess.h>
 21 #include <linux/skbuff.h>
 22 #include <linux/netdevice.h>
 23 #include <linux/in.h>
 24 #include <linux/tcp.h>
 25 #include <linux/udp.h>
 26 #include <linux/if_arp.h>
 27 #include <linux/init.h>
 28 #include <linux/in6.h>
 29 #include <linux/inetdevice.h>
 30 #include <linux/igmp.h>
 31 #include <linux/netfilter_ipv4.h>
 32 #include <linux/etherdevice.h>
 33 #include <linux/if_ether.h>
 34 #include <linux/hash.h>
 35 #include <linux/if_tunnel.h>
 36 #include <linux/ip6_tunnel.h>
 37 
 38 #include <net/sock.h>
 39 #include <net/ip.h>
 40 #include <net/ip_tunnels.h>
 41 #include <net/icmp.h>
 42 #include <net/protocol.h>
 43 #include <net/addrconf.h>
 44 #include <net/arp.h>
 45 #include <net/checksum.h>
 46 #include <net/dsfield.h>
 47 #include <net/inet_ecn.h>
 48 #include <net/xfrm.h>
 49 #include <net/net_namespace.h>
 50 #include <net/netns/generic.h>
 51 #include <net/rtnetlink.h>
 52 
 53 #include <net/ipv6.h>
 54 #include <net/ip6_fib.h>
 55 #include <net/ip6_route.h>
 56 #include <net/ip6_tunnel.h>
 57 #include <net/gre.h>
 58 #include <net/erspan.h>
 59 #include <net/dst_metadata.h>
 60 
 61 
 62 static bool log_ecn_error = true;
 63 module_param(log_ecn_error, bool, 0644);
 64 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
 65 
 66 #define IP6_GRE_HASH_SIZE_SHIFT  5
 67 #define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
 68 
 69 static unsigned int ip6gre_net_id __read_mostly;
 70 struct ip6gre_net {
 71         struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
 72 
 73         struct ip6_tnl __rcu *collect_md_tun;
 74         struct ip6_tnl __rcu *collect_md_tun_erspan;
 75         struct net_device *fb_tunnel_dev;
 76 };
 77 
 78 static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
 79 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
 80 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly;
 81 static int ip6gre_tunnel_init(struct net_device *dev);
 82 static void ip6gre_tunnel_setup(struct net_device *dev);
 83 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
 84 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
 85 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu);
 86 
 87 /* Tunnel hash table */
 88 
 89 /*
 90    4 hash tables:
 91 
 92    3: (remote,local)
 93    2: (remote,*)
 94    1: (*,local)
 95    0: (*,*)
 96 
 97    We require exact key match i.e. if a key is present in packet
 98    it will match only tunnel with the same key; if it is not present,
 99    it will match only keyless tunnel.
100 
101    All keysless packets, if not matched configured keyless tunnels
102    will match fallback tunnel.
103  */
104 
105 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
106 static u32 HASH_ADDR(const struct in6_addr *addr)
107 {
108         u32 hash = ipv6_addr_hash(addr);
109 
110         return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
111 }
112 
113 #define tunnels_r_l     tunnels[3]
114 #define tunnels_r       tunnels[2]
115 #define tunnels_l       tunnels[1]
116 #define tunnels_wc      tunnels[0]
117 
118 /* Given src, dst and key, find appropriate for input tunnel. */
119 
120 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
121                 const struct in6_addr *remote, const struct in6_addr *local,
122                 __be32 key, __be16 gre_proto)
123 {
124         struct net *net = dev_net(dev);
125         int link = dev->ifindex;
126         unsigned int h0 = HASH_ADDR(remote);
127         unsigned int h1 = HASH_KEY(key);
128         struct ip6_tnl *t, *cand = NULL;
129         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
130         int dev_type = (gre_proto == htons(ETH_P_TEB) ||
131                         gre_proto == htons(ETH_P_ERSPAN) ||
132                         gre_proto == htons(ETH_P_ERSPAN2)) ?
133                        ARPHRD_ETHER : ARPHRD_IP6GRE;
134         int score, cand_score = 4;
135 
136         for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
137                 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
138                     !ipv6_addr_equal(remote, &t->parms.raddr) ||
139                     key != t->parms.i_key ||
140                     !(t->dev->flags & IFF_UP))
141                         continue;
142 
143                 if (t->dev->type != ARPHRD_IP6GRE &&
144                     t->dev->type != dev_type)
145                         continue;
146 
147                 score = 0;
148                 if (t->parms.link != link)
149                         score |= 1;
150                 if (t->dev->type != dev_type)
151                         score |= 2;
152                 if (score == 0)
153                         return t;
154 
155                 if (score < cand_score) {
156                         cand = t;
157                         cand_score = score;
158                 }
159         }
160 
161         for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
162                 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
163                     key != t->parms.i_key ||
164                     !(t->dev->flags & IFF_UP))
165                         continue;
166 
167                 if (t->dev->type != ARPHRD_IP6GRE &&
168                     t->dev->type != dev_type)
169                         continue;
170 
171                 score = 0;
172                 if (t->parms.link != link)
173                         score |= 1;
174                 if (t->dev->type != dev_type)
175                         score |= 2;
176                 if (score == 0)
177                         return t;
178 
179                 if (score < cand_score) {
180                         cand = t;
181                         cand_score = score;
182                 }
183         }
184 
185         for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
186                 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
187                           (!ipv6_addr_equal(local, &t->parms.raddr) ||
188                                  !ipv6_addr_is_multicast(local))) ||
189                     key != t->parms.i_key ||
190                     !(t->dev->flags & IFF_UP))
191                         continue;
192 
193                 if (t->dev->type != ARPHRD_IP6GRE &&
194                     t->dev->type != dev_type)
195                         continue;
196 
197                 score = 0;
198                 if (t->parms.link != link)
199                         score |= 1;
200                 if (t->dev->type != dev_type)
201                         score |= 2;
202                 if (score == 0)
203                         return t;
204 
205                 if (score < cand_score) {
206                         cand = t;
207                         cand_score = score;
208                 }
209         }
210 
211         for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
212                 if (t->parms.i_key != key ||
213                     !(t->dev->flags & IFF_UP))
214                         continue;
215 
216                 if (t->dev->type != ARPHRD_IP6GRE &&
217                     t->dev->type != dev_type)
218                         continue;
219 
220                 score = 0;
221                 if (t->parms.link != link)
222                         score |= 1;
223                 if (t->dev->type != dev_type)
224                         score |= 2;
225                 if (score == 0)
226                         return t;
227 
228                 if (score < cand_score) {
229                         cand = t;
230                         cand_score = score;
231                 }
232         }
233 
234         if (cand)
235                 return cand;
236 
237         if (gre_proto == htons(ETH_P_ERSPAN) ||
238             gre_proto == htons(ETH_P_ERSPAN2))
239                 t = rcu_dereference(ign->collect_md_tun_erspan);
240         else
241                 t = rcu_dereference(ign->collect_md_tun);
242 
243         if (t && t->dev->flags & IFF_UP)
244                 return t;
245 
246         dev = ign->fb_tunnel_dev;
247         if (dev && dev->flags & IFF_UP)
248                 return netdev_priv(dev);
249 
250         return NULL;
251 }
252 
253 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
254                 const struct __ip6_tnl_parm *p)
255 {
256         const struct in6_addr *remote = &p->raddr;
257         const struct in6_addr *local = &p->laddr;
258         unsigned int h = HASH_KEY(p->i_key);
259         int prio = 0;
260 
261         if (!ipv6_addr_any(local))
262                 prio |= 1;
263         if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
264                 prio |= 2;
265                 h ^= HASH_ADDR(remote);
266         }
267 
268         return &ign->tunnels[prio][h];
269 }
270 
271 static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
272 {
273         if (t->parms.collect_md)
274                 rcu_assign_pointer(ign->collect_md_tun, t);
275 }
276 
277 static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
278 {
279         if (t->parms.collect_md)
280                 rcu_assign_pointer(ign->collect_md_tun_erspan, t);
281 }
282 
283 static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t)
284 {
285         if (t->parms.collect_md)
286                 rcu_assign_pointer(ign->collect_md_tun, NULL);
287 }
288 
289 static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign,
290                                        struct ip6_tnl *t)
291 {
292         if (t->parms.collect_md)
293                 rcu_assign_pointer(ign->collect_md_tun_erspan, NULL);
294 }
295 
296 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
297                 const struct ip6_tnl *t)
298 {
299         return __ip6gre_bucket(ign, &t->parms);
300 }
301 
302 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
303 {
304         struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
305 
306         rcu_assign_pointer(t->next, rtnl_dereference(*tp));
307         rcu_assign_pointer(*tp, t);
308 }
309 
310 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
311 {
312         struct ip6_tnl __rcu **tp;
313         struct ip6_tnl *iter;
314 
315         for (tp = ip6gre_bucket(ign, t);
316              (iter = rtnl_dereference(*tp)) != NULL;
317              tp = &iter->next) {
318                 if (t == iter) {
319                         rcu_assign_pointer(*tp, t->next);
320                         break;
321                 }
322         }
323 }
324 
325 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
326                                            const struct __ip6_tnl_parm *parms,
327                                            int type)
328 {
329         const struct in6_addr *remote = &parms->raddr;
330         const struct in6_addr *local = &parms->laddr;
331         __be32 key = parms->i_key;
332         int link = parms->link;
333         struct ip6_tnl *t;
334         struct ip6_tnl __rcu **tp;
335         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
336 
337         for (tp = __ip6gre_bucket(ign, parms);
338              (t = rtnl_dereference(*tp)) != NULL;
339              tp = &t->next)
340                 if (ipv6_addr_equal(local, &t->parms.laddr) &&
341                     ipv6_addr_equal(remote, &t->parms.raddr) &&
342                     key == t->parms.i_key &&
343                     link == t->parms.link &&
344                     type == t->dev->type)
345                         break;
346 
347         return t;
348 }
349 
350 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
351                 const struct __ip6_tnl_parm *parms, int create)
352 {
353         struct ip6_tnl *t, *nt;
354         struct net_device *dev;
355         char name[IFNAMSIZ];
356         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
357 
358         t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
359         if (t && create)
360                 return NULL;
361         if (t || !create)
362                 return t;
363 
364         if (parms->name[0]) {
365                 if (!dev_valid_name(parms->name))
366                         return NULL;
367                 strlcpy(name, parms->name, IFNAMSIZ);
368         } else {
369                 strcpy(name, "ip6gre%d");
370         }
371         dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
372                            ip6gre_tunnel_setup);
373         if (!dev)
374                 return NULL;
375 
376         dev_net_set(dev, net);
377 
378         nt = netdev_priv(dev);
379         nt->parms = *parms;
380         dev->rtnl_link_ops = &ip6gre_link_ops;
381 
382         nt->dev = dev;
383         nt->net = dev_net(dev);
384 
385         if (register_netdevice(dev) < 0)
386                 goto failed_free;
387 
388         ip6gre_tnl_link_config(nt, 1);
389 
390         /* Can use a lockless transmit, unless we generate output sequences */
391         if (!(nt->parms.o_flags & TUNNEL_SEQ))
392                 dev->features |= NETIF_F_LLTX;
393 
394         dev_hold(dev);
395         ip6gre_tunnel_link(ign, nt);
396         return nt;
397 
398 failed_free:
399         free_netdev(dev);
400         return NULL;
401 }
402 
403 static void ip6erspan_tunnel_uninit(struct net_device *dev)
404 {
405         struct ip6_tnl *t = netdev_priv(dev);
406         struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
407 
408         ip6erspan_tunnel_unlink_md(ign, t);
409         ip6gre_tunnel_unlink(ign, t);
410         dst_cache_reset(&t->dst_cache);
411         dev_put(dev);
412 }
413 
414 static void ip6gre_tunnel_uninit(struct net_device *dev)
415 {
416         struct ip6_tnl *t = netdev_priv(dev);
417         struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
418 
419         ip6gre_tunnel_unlink_md(ign, t);
420         ip6gre_tunnel_unlink(ign, t);
421         dst_cache_reset(&t->dst_cache);
422         dev_put(dev);
423 }
424 
425 
426 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
427                        u8 type, u8 code, int offset, __be32 info)
428 {
429         struct net *net = dev_net(skb->dev);
430         const struct gre_base_hdr *greh;
431         const struct ipv6hdr *ipv6h;
432         int grehlen = sizeof(*greh);
433         struct ip6_tnl *t;
434         int key_off = 0;
435         __be16 flags;
436         __be32 key;
437 
438         if (!pskb_may_pull(skb, offset + grehlen))
439                 return;
440         greh = (const struct gre_base_hdr *)(skb->data + offset);
441         flags = greh->flags;
442         if (flags & (GRE_VERSION | GRE_ROUTING))
443                 return;
444         if (flags & GRE_CSUM)
445                 grehlen += 4;
446         if (flags & GRE_KEY) {
447                 key_off = grehlen + offset;
448                 grehlen += 4;
449         }
450 
451         if (!pskb_may_pull(skb, offset + grehlen))
452                 return;
453         ipv6h = (const struct ipv6hdr *)skb->data;
454         greh = (const struct gre_base_hdr *)(skb->data + offset);
455         key = key_off ? *(__be32 *)(skb->data + key_off) : 0;
456 
457         t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
458                                  key, greh->protocol);
459         if (!t)
460                 return;
461 
462         switch (type) {
463                 struct ipv6_tlv_tnl_enc_lim *tel;
464                 __u32 teli;
465         case ICMPV6_DEST_UNREACH:
466                 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
467                                     t->parms.name);
468                 if (code != ICMPV6_PORT_UNREACH)
469                         break;
470                 return;
471         case ICMPV6_TIME_EXCEED:
472                 if (code == ICMPV6_EXC_HOPLIMIT) {
473                         net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
474                                             t->parms.name);
475                         break;
476                 }
477                 return;
478         case ICMPV6_PARAMPROB:
479                 teli = 0;
480                 if (code == ICMPV6_HDR_FIELD)
481                         teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
482 
483                 if (teli && teli == be32_to_cpu(info) - 2) {
484                         tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
485                         if (tel->encap_limit == 0) {
486                                 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
487                                                     t->parms.name);
488                         }
489                 } else {
490                         net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
491                                             t->parms.name);
492                 }
493                 return;
494         case ICMPV6_PKT_TOOBIG:
495                 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
496                 return;
497         case NDISC_REDIRECT:
498                 ip6_redirect(skb, net, skb->dev->ifindex, 0,
499                              sock_net_uid(net, NULL));
500                 return;
501         }
502 
503         if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
504                 t->err_count++;
505         else
506                 t->err_count = 1;
507         t->err_time = jiffies;
508 }
509 
510 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
511 {
512         const struct ipv6hdr *ipv6h;
513         struct ip6_tnl *tunnel;
514 
515         ipv6h = ipv6_hdr(skb);
516         tunnel = ip6gre_tunnel_lookup(skb->dev,
517                                       &ipv6h->saddr, &ipv6h->daddr, tpi->key,
518                                       tpi->proto);
519         if (tunnel) {
520                 if (tunnel->parms.collect_md) {
521                         struct metadata_dst *tun_dst;
522                         __be64 tun_id;
523                         __be16 flags;
524 
525                         flags = tpi->flags;
526                         tun_id = key32_to_tunnel_id(tpi->key);
527 
528                         tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
529                         if (!tun_dst)
530                                 return PACKET_REJECT;
531 
532                         ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
533                 } else {
534                         ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
535                 }
536 
537                 return PACKET_RCVD;
538         }
539 
540         return PACKET_REJECT;
541 }
542 
543 static int ip6erspan_rcv(struct sk_buff *skb, int gre_hdr_len,
544                          struct tnl_ptk_info *tpi)
545 {
546         struct erspan_base_hdr *ershdr;
547         struct erspan_metadata *pkt_md;
548         const struct ipv6hdr *ipv6h;
549         struct erspan_md2 *md2;
550         struct ip6_tnl *tunnel;
551         u8 ver;
552 
553         if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr))))
554                 return PACKET_REJECT;
555 
556         ipv6h = ipv6_hdr(skb);
557         ershdr = (struct erspan_base_hdr *)skb->data;
558         ver = ershdr->ver;
559         tpi->key = cpu_to_be32(get_session_id(ershdr));
560 
561         tunnel = ip6gre_tunnel_lookup(skb->dev,
562                                       &ipv6h->saddr, &ipv6h->daddr, tpi->key,
563                                       tpi->proto);
564         if (tunnel) {
565                 int len = erspan_hdr_len(ver);
566 
567                 if (unlikely(!pskb_may_pull(skb, len)))
568                         return PACKET_REJECT;
569 
570                 ershdr = (struct erspan_base_hdr *)skb->data;
571                 pkt_md = (struct erspan_metadata *)(ershdr + 1);
572 
573                 if (__iptunnel_pull_header(skb, len,
574                                            htons(ETH_P_TEB),
575                                            false, false) < 0)
576                         return PACKET_REJECT;
577 
578                 if (tunnel->parms.collect_md) {
579                         struct metadata_dst *tun_dst;
580                         struct ip_tunnel_info *info;
581                         struct erspan_metadata *md;
582                         __be64 tun_id;
583                         __be16 flags;
584 
585                         tpi->flags |= TUNNEL_KEY;
586                         flags = tpi->flags;
587                         tun_id = key32_to_tunnel_id(tpi->key);
588 
589                         tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
590                                                   sizeof(*md));
591                         if (!tun_dst)
592                                 return PACKET_REJECT;
593 
594                         info = &tun_dst->u.tun_info;
595                         md = ip_tunnel_info_opts(info);
596                         md->version = ver;
597                         md2 = &md->u.md2;
598                         memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
599                                                        ERSPAN_V2_MDSIZE);
600                         info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
601                         info->options_len = sizeof(*md);
602 
603                         ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
604 
605                 } else {
606                         ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
607                 }
608 
609                 return PACKET_RCVD;
610         }
611 
612         return PACKET_REJECT;
613 }
614 
615 static int gre_rcv(struct sk_buff *skb)
616 {
617         struct tnl_ptk_info tpi;
618         bool csum_err = false;
619         int hdr_len;
620 
621         hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
622         if (hdr_len < 0)
623                 goto drop;
624 
625         if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
626                 goto drop;
627 
628         if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
629                      tpi.proto == htons(ETH_P_ERSPAN2))) {
630                 if (ip6erspan_rcv(skb, hdr_len, &tpi) == PACKET_RCVD)
631                         return 0;
632                 goto out;
633         }
634 
635         if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
636                 return 0;
637 
638 out:
639         icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
640 drop:
641         kfree_skb(skb);
642         return 0;
643 }
644 
645 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
646 {
647         return iptunnel_handle_offloads(skb,
648                                         csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
649 }
650 
651 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
652                                      struct net_device *dev,
653                                      struct flowi6 *fl6, __u8 *dsfield,
654                                      int *encap_limit)
655 {
656         const struct iphdr *iph = ip_hdr(skb);
657         struct ip6_tnl *t = netdev_priv(dev);
658 
659         if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
660                 *encap_limit = t->parms.encap_limit;
661 
662         memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
663 
664         if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
665                 *dsfield = ipv4_get_dsfield(iph);
666         else
667                 *dsfield = ip6_tclass(t->parms.flowinfo);
668 
669         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
670                 fl6->flowi6_mark = skb->mark;
671         else
672                 fl6->flowi6_mark = t->parms.fwmark;
673 
674         fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
675 }
676 
677 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
678                                     struct net_device *dev,
679                                     struct flowi6 *fl6, __u8 *dsfield,
680                                     int *encap_limit)
681 {
682         struct ipv6hdr *ipv6h = ipv6_hdr(skb);
683         struct ip6_tnl *t = netdev_priv(dev);
684         __u16 offset;
685 
686         offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
687         /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
688 
689         if (offset > 0) {
690                 struct ipv6_tlv_tnl_enc_lim *tel;
691 
692                 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
693                 if (tel->encap_limit == 0) {
694                         icmpv6_send(skb, ICMPV6_PARAMPROB,
695                                     ICMPV6_HDR_FIELD, offset + 2);
696                         return -1;
697                 }
698                 *encap_limit = tel->encap_limit - 1;
699         } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
700                 *encap_limit = t->parms.encap_limit;
701         }
702 
703         memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
704 
705         if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
706                 *dsfield = ipv6_get_dsfield(ipv6h);
707         else
708                 *dsfield = ip6_tclass(t->parms.flowinfo);
709 
710         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
711                 fl6->flowlabel |= ip6_flowlabel(ipv6h);
712 
713         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
714                 fl6->flowi6_mark = skb->mark;
715         else
716                 fl6->flowi6_mark = t->parms.fwmark;
717 
718         fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
719 
720         return 0;
721 }
722 
723 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
724                                struct net_device *dev, __u8 dsfield,
725                                struct flowi6 *fl6, int encap_limit,
726                                __u32 *pmtu, __be16 proto)
727 {
728         struct ip6_tnl *tunnel = netdev_priv(dev);
729         __be16 protocol;
730 
731         if (dev->type == ARPHRD_ETHER)
732                 IPCB(skb)->flags = 0;
733 
734         if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
735                 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
736         else
737                 fl6->daddr = tunnel->parms.raddr;
738 
739         if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
740                 return -ENOMEM;
741 
742         /* Push GRE header. */
743         protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
744 
745         if (tunnel->parms.collect_md) {
746                 struct ip_tunnel_info *tun_info;
747                 const struct ip_tunnel_key *key;
748                 __be16 flags;
749 
750                 tun_info = skb_tunnel_info(skb);
751                 if (unlikely(!tun_info ||
752                              !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
753                              ip_tunnel_info_af(tun_info) != AF_INET6))
754                         return -EINVAL;
755 
756                 key = &tun_info->key;
757                 memset(fl6, 0, sizeof(*fl6));
758                 fl6->flowi6_proto = IPPROTO_GRE;
759                 fl6->daddr = key->u.ipv6.dst;
760                 fl6->flowlabel = key->label;
761                 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
762 
763                 dsfield = key->tos;
764                 flags = key->tun_flags &
765                         (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
766                 tunnel->tun_hlen = gre_calc_hlen(flags);
767 
768                 gre_build_header(skb, tunnel->tun_hlen,
769                                  flags, protocol,
770                                  tunnel_id_to_key32(tun_info->key.tun_id),
771                                  (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++)
772                                                       : 0);
773 
774         } else {
775                 if (tunnel->parms.o_flags & TUNNEL_SEQ)
776                         tunnel->o_seqno++;
777 
778                 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
779                                  protocol, tunnel->parms.o_key,
780                                  htonl(tunnel->o_seqno));
781         }
782 
783         return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
784                             NEXTHDR_GRE);
785 }
786 
787 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
788 {
789         struct ip6_tnl *t = netdev_priv(dev);
790         int encap_limit = -1;
791         struct flowi6 fl6;
792         __u8 dsfield = 0;
793         __u32 mtu;
794         int err;
795 
796         memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
797 
798         if (!t->parms.collect_md)
799                 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
800                                          &dsfield, &encap_limit);
801 
802         err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
803         if (err)
804                 return -1;
805 
806         err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
807                           skb->protocol);
808         if (err != 0) {
809                 /* XXX: send ICMP error even if DF is not set. */
810                 if (err == -EMSGSIZE)
811                         icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
812                                   htonl(mtu));
813                 return -1;
814         }
815 
816         return 0;
817 }
818 
819 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
820 {
821         struct ip6_tnl *t = netdev_priv(dev);
822         struct ipv6hdr *ipv6h = ipv6_hdr(skb);
823         int encap_limit = -1;
824         struct flowi6 fl6;
825         __u8 dsfield = 0;
826         __u32 mtu;
827         int err;
828 
829         if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
830                 return -1;
831 
832         if (!t->parms.collect_md &&
833             prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
834                 return -1;
835 
836         if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
837                 return -1;
838 
839         err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
840                           &mtu, skb->protocol);
841         if (err != 0) {
842                 if (err == -EMSGSIZE)
843                         icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
844                 return -1;
845         }
846 
847         return 0;
848 }
849 
850 /**
851  * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own
852  *   @t: the outgoing tunnel device
853  *   @hdr: IPv6 header from the incoming packet
854  *
855  * Description:
856  *   Avoid trivial tunneling loop by checking that tunnel exit-point
857  *   doesn't match source of incoming packet.
858  *
859  * Return:
860  *   1 if conflict,
861  *   0 else
862  **/
863 
864 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
865         const struct ipv6hdr *hdr)
866 {
867         return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
868 }
869 
870 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
871 {
872         struct ip6_tnl *t = netdev_priv(dev);
873         int encap_limit = -1;
874         struct flowi6 fl6;
875         __u32 mtu;
876         int err;
877 
878         if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
879                 encap_limit = t->parms.encap_limit;
880 
881         if (!t->parms.collect_md)
882                 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
883 
884         err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
885         if (err)
886                 return err;
887 
888         err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
889 
890         return err;
891 }
892 
893 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
894         struct net_device *dev)
895 {
896         struct ip6_tnl *t = netdev_priv(dev);
897         struct net_device_stats *stats = &t->dev->stats;
898         int ret;
899 
900         if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
901                 goto tx_err;
902 
903         switch (skb->protocol) {
904         case htons(ETH_P_IP):
905                 ret = ip6gre_xmit_ipv4(skb, dev);
906                 break;
907         case htons(ETH_P_IPV6):
908                 ret = ip6gre_xmit_ipv6(skb, dev);
909                 break;
910         default:
911                 ret = ip6gre_xmit_other(skb, dev);
912                 break;
913         }
914 
915         if (ret < 0)
916                 goto tx_err;
917 
918         return NETDEV_TX_OK;
919 
920 tx_err:
921         stats->tx_errors++;
922         stats->tx_dropped++;
923         kfree_skb(skb);
924         return NETDEV_TX_OK;
925 }
926 
927 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
928                                          struct net_device *dev)
929 {
930         struct ip6_tnl *t = netdev_priv(dev);
931         struct dst_entry *dst = skb_dst(skb);
932         struct net_device_stats *stats;
933         bool truncate = false;
934         int encap_limit = -1;
935         __u8 dsfield = false;
936         struct flowi6 fl6;
937         int err = -EINVAL;
938         __u32 mtu;
939         int nhoff;
940         int thoff;
941 
942         if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
943                 goto tx_err;
944 
945         if (gre_handle_offloads(skb, false))
946                 goto tx_err;
947 
948         if (skb->len > dev->mtu + dev->hard_header_len) {
949                 pskb_trim(skb, dev->mtu + dev->hard_header_len);
950                 truncate = true;
951         }
952 
953         nhoff = skb_network_header(skb) - skb_mac_header(skb);
954         if (skb->protocol == htons(ETH_P_IP) &&
955             (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
956                 truncate = true;
957 
958         thoff = skb_transport_header(skb) - skb_mac_header(skb);
959         if (skb->protocol == htons(ETH_P_IPV6) &&
960             (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff))
961                 truncate = true;
962 
963         if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
964                 goto tx_err;
965 
966         t->parms.o_flags &= ~TUNNEL_KEY;
967         IPCB(skb)->flags = 0;
968 
969         /* For collect_md mode, derive fl6 from the tunnel key,
970          * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
971          */
972         if (t->parms.collect_md) {
973                 struct ip_tunnel_info *tun_info;
974                 const struct ip_tunnel_key *key;
975                 struct erspan_metadata *md;
976                 __be32 tun_id;
977 
978                 tun_info = skb_tunnel_info(skb);
979                 if (unlikely(!tun_info ||
980                              !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
981                              ip_tunnel_info_af(tun_info) != AF_INET6))
982                         return -EINVAL;
983 
984                 key = &tun_info->key;
985                 memset(&fl6, 0, sizeof(fl6));
986                 fl6.flowi6_proto = IPPROTO_GRE;
987                 fl6.daddr = key->u.ipv6.dst;
988                 fl6.flowlabel = key->label;
989                 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
990 
991                 dsfield = key->tos;
992                 md = ip_tunnel_info_opts(tun_info);
993                 if (!md)
994                         goto tx_err;
995 
996                 tun_id = tunnel_id_to_key32(key->tun_id);
997                 if (md->version == 1) {
998                         erspan_build_header(skb,
999                                             ntohl(tun_id),
1000                                             ntohl(md->u.index), truncate,
1001                                             false);
1002                 } else if (md->version == 2) {
1003                         erspan_build_header_v2(skb,
1004                                                ntohl(tun_id),
1005                                                md->u.md2.dir,
1006                                                get_hwid(&md->u.md2),
1007                                                truncate, false);
1008                 } else {
1009                         goto tx_err;
1010                 }
1011         } else {
1012                 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
1013 
1014                 switch (skb->protocol) {
1015                 case htons(ETH_P_IP):
1016                         memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1017                         prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1018                                                  &dsfield, &encap_limit);
1019                         break;
1020                 case htons(ETH_P_IPV6):
1021                         if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
1022                                 goto tx_err;
1023                         if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1024                                                      &dsfield, &encap_limit))
1025                                 goto tx_err;
1026                         break;
1027                 default:
1028                         memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1029                         break;
1030                 }
1031 
1032                 if (t->parms.erspan_ver == 1)
1033                         erspan_build_header(skb, ntohl(t->parms.o_key),
1034                                             t->parms.index,
1035                                             truncate, false);
1036                 else if (t->parms.erspan_ver == 2)
1037                         erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1038                                                t->parms.dir,
1039                                                t->parms.hwid,
1040                                                truncate, false);
1041                 else
1042                         goto tx_err;
1043 
1044                 fl6.daddr = t->parms.raddr;
1045         }
1046 
1047         /* Push GRE header. */
1048         gre_build_header(skb, 8, TUNNEL_SEQ,
1049                          htons(ETH_P_ERSPAN), 0, htonl(t->o_seqno++));
1050 
1051         /* TooBig packet may have updated dst->dev's mtu */
1052         if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1053                 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu);
1054 
1055         err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1056                            NEXTHDR_GRE);
1057         if (err != 0) {
1058                 /* XXX: send ICMP error even if DF is not set. */
1059                 if (err == -EMSGSIZE) {
1060                         if (skb->protocol == htons(ETH_P_IP))
1061                                 icmp_send(skb, ICMP_DEST_UNREACH,
1062                                           ICMP_FRAG_NEEDED, htonl(mtu));
1063                         else
1064                                 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1065                 }
1066 
1067                 goto tx_err;
1068         }
1069         return NETDEV_TX_OK;
1070 
1071 tx_err:
1072         stats = &t->dev->stats;
1073         stats->tx_errors++;
1074         stats->tx_dropped++;
1075         kfree_skb(skb);
1076         return NETDEV_TX_OK;
1077 }
1078 
1079 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1080 {
1081         struct net_device *dev = t->dev;
1082         struct __ip6_tnl_parm *p = &t->parms;
1083         struct flowi6 *fl6 = &t->fl.u.ip6;
1084 
1085         if (dev->type != ARPHRD_ETHER) {
1086                 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1087                 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1088         }
1089 
1090         /* Set up flowi template */
1091         fl6->saddr = p->laddr;
1092         fl6->daddr = p->raddr;
1093         fl6->flowi6_oif = p->link;
1094         fl6->flowlabel = 0;
1095         fl6->flowi6_proto = IPPROTO_GRE;
1096 
1097         if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1098                 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1099         if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1100                 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1101 
1102         p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1103         p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1104 
1105         if (p->flags&IP6_TNL_F_CAP_XMIT &&
1106                         p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1107                 dev->flags |= IFF_POINTOPOINT;
1108         else
1109                 dev->flags &= ~IFF_POINTOPOINT;
1110 }
1111 
1112 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1113                                          int t_hlen)
1114 {
1115         const struct __ip6_tnl_parm *p = &t->parms;
1116         struct net_device *dev = t->dev;
1117 
1118         if (p->flags & IP6_TNL_F_CAP_XMIT) {
1119                 int strict = (ipv6_addr_type(&p->raddr) &
1120                               (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1121 
1122                 struct rt6_info *rt = rt6_lookup(t->net,
1123                                                  &p->raddr, &p->laddr,
1124                                                  p->link, NULL, strict);
1125 
1126                 if (!rt)
1127                         return;
1128 
1129                 if (rt->dst.dev) {
1130                         dev->hard_header_len = rt->dst.dev->hard_header_len +
1131                                                t_hlen;
1132 
1133                         if (set_mtu) {
1134                                 dev->mtu = rt->dst.dev->mtu - t_hlen;
1135                                 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1136                                         dev->mtu -= 8;
1137                                 if (dev->type == ARPHRD_ETHER)
1138                                         dev->mtu -= ETH_HLEN;
1139 
1140                                 if (dev->mtu < IPV6_MIN_MTU)
1141                                         dev->mtu = IPV6_MIN_MTU;
1142                         }
1143                 }
1144                 ip6_rt_put(rt);
1145         }
1146 }
1147 
1148 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1149 {
1150         int t_hlen;
1151 
1152         tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1153         tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1154 
1155         t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1156         tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1157         return t_hlen;
1158 }
1159 
1160 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1161 {
1162         ip6gre_tnl_link_config_common(t);
1163         ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1164 }
1165 
1166 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1167                                      const struct __ip6_tnl_parm *p)
1168 {
1169         t->parms.laddr = p->laddr;
1170         t->parms.raddr = p->raddr;
1171         t->parms.flags = p->flags;
1172         t->parms.hop_limit = p->hop_limit;
1173         t->parms.encap_limit = p->encap_limit;
1174         t->parms.flowinfo = p->flowinfo;
1175         t->parms.link = p->link;
1176         t->parms.proto = p->proto;
1177         t->parms.i_key = p->i_key;
1178         t->parms.o_key = p->o_key;
1179         t->parms.i_flags = p->i_flags;
1180         t->parms.o_flags = p->o_flags;
1181         t->parms.fwmark = p->fwmark;
1182         dst_cache_reset(&t->dst_cache);
1183 }
1184 
1185 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1186                              int set_mtu)
1187 {
1188         ip6gre_tnl_copy_tnl_parm(t, p);
1189         ip6gre_tnl_link_config(t, set_mtu);
1190         return 0;
1191 }
1192 
1193 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1194         const struct ip6_tnl_parm2 *u)
1195 {
1196         p->laddr = u->laddr;
1197         p->raddr = u->raddr;
1198         p->flags = u->flags;
1199         p->hop_limit = u->hop_limit;
1200         p->encap_limit = u->encap_limit;
1201         p->flowinfo = u->flowinfo;
1202         p->link = u->link;
1203         p->i_key = u->i_key;
1204         p->o_key = u->o_key;
1205         p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1206         p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1207         memcpy(p->name, u->name, sizeof(u->name));
1208 }
1209 
1210 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1211         const struct __ip6_tnl_parm *p)
1212 {
1213         u->proto = IPPROTO_GRE;
1214         u->laddr = p->laddr;
1215         u->raddr = p->raddr;
1216         u->flags = p->flags;
1217         u->hop_limit = p->hop_limit;
1218         u->encap_limit = p->encap_limit;
1219         u->flowinfo = p->flowinfo;
1220         u->link = p->link;
1221         u->i_key = p->i_key;
1222         u->o_key = p->o_key;
1223         u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1224         u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1225         memcpy(u->name, p->name, sizeof(u->name));
1226 }
1227 
1228 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1229         struct ifreq *ifr, int cmd)
1230 {
1231         int err = 0;
1232         struct ip6_tnl_parm2 p;
1233         struct __ip6_tnl_parm p1;
1234         struct ip6_tnl *t = netdev_priv(dev);
1235         struct net *net = t->net;
1236         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1237 
1238         memset(&p1, 0, sizeof(p1));
1239 
1240         switch (cmd) {
1241         case SIOCGETTUNNEL:
1242                 if (dev == ign->fb_tunnel_dev) {
1243                         if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1244                                 err = -EFAULT;
1245                                 break;
1246                         }
1247                         ip6gre_tnl_parm_from_user(&p1, &p);
1248                         t = ip6gre_tunnel_locate(net, &p1, 0);
1249                         if (!t)
1250                                 t = netdev_priv(dev);
1251                 }
1252                 memset(&p, 0, sizeof(p));
1253                 ip6gre_tnl_parm_to_user(&p, &t->parms);
1254                 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1255                         err = -EFAULT;
1256                 break;
1257 
1258         case SIOCADDTUNNEL:
1259         case SIOCCHGTUNNEL:
1260                 err = -EPERM;
1261                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1262                         goto done;
1263 
1264                 err = -EFAULT;
1265                 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1266                         goto done;
1267 
1268                 err = -EINVAL;
1269                 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1270                         goto done;
1271 
1272                 if (!(p.i_flags&GRE_KEY))
1273                         p.i_key = 0;
1274                 if (!(p.o_flags&GRE_KEY))
1275                         p.o_key = 0;
1276 
1277                 ip6gre_tnl_parm_from_user(&p1, &p);
1278                 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1279 
1280                 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1281                         if (t) {
1282                                 if (t->dev != dev) {
1283                                         err = -EEXIST;
1284                                         break;
1285                                 }
1286                         } else {
1287                                 t = netdev_priv(dev);
1288 
1289                                 ip6gre_tunnel_unlink(ign, t);
1290                                 synchronize_net();
1291                                 ip6gre_tnl_change(t, &p1, 1);
1292                                 ip6gre_tunnel_link(ign, t);
1293                                 netdev_state_change(dev);
1294                         }
1295                 }
1296 
1297                 if (t) {
1298                         err = 0;
1299 
1300                         memset(&p, 0, sizeof(p));
1301                         ip6gre_tnl_parm_to_user(&p, &t->parms);
1302                         if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1303                                 err = -EFAULT;
1304                 } else
1305                         err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1306                 break;
1307 
1308         case SIOCDELTUNNEL:
1309                 err = -EPERM;
1310                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1311                         goto done;
1312 
1313                 if (dev == ign->fb_tunnel_dev) {
1314                         err = -EFAULT;
1315                         if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1316                                 goto done;
1317                         err = -ENOENT;
1318                         ip6gre_tnl_parm_from_user(&p1, &p);
1319                         t = ip6gre_tunnel_locate(net, &p1, 0);
1320                         if (!t)
1321                                 goto done;
1322                         err = -EPERM;
1323                         if (t == netdev_priv(ign->fb_tunnel_dev))
1324                                 goto done;
1325                         dev = t->dev;
1326                 }
1327                 unregister_netdevice(dev);
1328                 err = 0;
1329                 break;
1330 
1331         default:
1332                 err = -EINVAL;
1333         }
1334 
1335 done:
1336         return err;
1337 }
1338 
1339 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1340                          unsigned short type, const void *daddr,
1341                          const void *saddr, unsigned int len)
1342 {
1343         struct ip6_tnl *t = netdev_priv(dev);
1344         struct ipv6hdr *ipv6h;
1345         __be16 *p;
1346 
1347         ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1348         ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1349                                                   t->fl.u.ip6.flowlabel,
1350                                                   true, &t->fl.u.ip6));
1351         ipv6h->hop_limit = t->parms.hop_limit;
1352         ipv6h->nexthdr = NEXTHDR_GRE;
1353         ipv6h->saddr = t->parms.laddr;
1354         ipv6h->daddr = t->parms.raddr;
1355 
1356         p = (__be16 *)(ipv6h + 1);
1357         p[0] = t->parms.o_flags;
1358         p[1] = htons(type);
1359 
1360         /*
1361          *      Set the source hardware address.
1362          */
1363 
1364         if (saddr)
1365                 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1366         if (daddr)
1367                 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1368         if (!ipv6_addr_any(&ipv6h->daddr))
1369                 return t->hlen;
1370 
1371         return -t->hlen;
1372 }
1373 
1374 static const struct header_ops ip6gre_header_ops = {
1375         .create = ip6gre_header,
1376 };
1377 
1378 static const struct net_device_ops ip6gre_netdev_ops = {
1379         .ndo_init               = ip6gre_tunnel_init,
1380         .ndo_uninit             = ip6gre_tunnel_uninit,
1381         .ndo_start_xmit         = ip6gre_tunnel_xmit,
1382         .ndo_do_ioctl           = ip6gre_tunnel_ioctl,
1383         .ndo_change_mtu         = ip6_tnl_change_mtu,
1384         .ndo_get_stats64        = ip_tunnel_get_stats64,
1385         .ndo_get_iflink         = ip6_tnl_get_iflink,
1386 };
1387 
1388 static void ip6gre_dev_free(struct net_device *dev)
1389 {
1390         struct ip6_tnl *t = netdev_priv(dev);
1391 
1392         gro_cells_destroy(&t->gro_cells);
1393         dst_cache_destroy(&t->dst_cache);
1394         free_percpu(dev->tstats);
1395 }
1396 
1397 static void ip6gre_tunnel_setup(struct net_device *dev)
1398 {
1399         dev->netdev_ops = &ip6gre_netdev_ops;
1400         dev->needs_free_netdev = true;
1401         dev->priv_destructor = ip6gre_dev_free;
1402 
1403         dev->type = ARPHRD_IP6GRE;
1404 
1405         dev->flags |= IFF_NOARP;
1406         dev->addr_len = sizeof(struct in6_addr);
1407         netif_keep_dst(dev);
1408         /* This perm addr will be used as interface identifier by IPv6 */
1409         dev->addr_assign_type = NET_ADDR_RANDOM;
1410         eth_random_addr(dev->perm_addr);
1411 }
1412 
1413 #define GRE6_FEATURES (NETIF_F_SG |             \
1414                        NETIF_F_FRAGLIST |       \
1415                        NETIF_F_HIGHDMA |        \
1416                        NETIF_F_HW_CSUM)
1417 
1418 static void ip6gre_tnl_init_features(struct net_device *dev)
1419 {
1420         struct ip6_tnl *nt = netdev_priv(dev);
1421 
1422         dev->features           |= GRE6_FEATURES;
1423         dev->hw_features        |= GRE6_FEATURES;
1424 
1425         if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1426                 /* TCP offload with GRE SEQ is not supported, nor
1427                  * can we support 2 levels of outer headers requiring
1428                  * an update.
1429                  */
1430                 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1431                     nt->encap.type == TUNNEL_ENCAP_NONE) {
1432                         dev->features    |= NETIF_F_GSO_SOFTWARE;
1433                         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1434                 }
1435 
1436                 /* Can use a lockless transmit, unless we generate
1437                  * output sequences
1438                  */
1439                 dev->features |= NETIF_F_LLTX;
1440         }
1441 }
1442 
1443 static int ip6gre_tunnel_init_common(struct net_device *dev)
1444 {
1445         struct ip6_tnl *tunnel;
1446         int ret;
1447         int t_hlen;
1448 
1449         tunnel = netdev_priv(dev);
1450 
1451         tunnel->dev = dev;
1452         tunnel->net = dev_net(dev);
1453         strcpy(tunnel->parms.name, dev->name);
1454 
1455         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1456         if (!dev->tstats)
1457                 return -ENOMEM;
1458 
1459         ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1460         if (ret)
1461                 goto cleanup_alloc_pcpu_stats;
1462 
1463         ret = gro_cells_init(&tunnel->gro_cells, dev);
1464         if (ret)
1465                 goto cleanup_dst_cache_init;
1466 
1467         t_hlen = ip6gre_calc_hlen(tunnel);
1468         dev->mtu = ETH_DATA_LEN - t_hlen;
1469         if (dev->type == ARPHRD_ETHER)
1470                 dev->mtu -= ETH_HLEN;
1471         if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1472                 dev->mtu -= 8;
1473 
1474         if (tunnel->parms.collect_md) {
1475                 dev->features |= NETIF_F_NETNS_LOCAL;
1476                 netif_keep_dst(dev);
1477         }
1478         ip6gre_tnl_init_features(dev);
1479 
1480         return 0;
1481 
1482 cleanup_dst_cache_init:
1483         dst_cache_destroy(&tunnel->dst_cache);
1484 cleanup_alloc_pcpu_stats:
1485         free_percpu(dev->tstats);
1486         dev->tstats = NULL;
1487         return ret;
1488 }
1489 
1490 static int ip6gre_tunnel_init(struct net_device *dev)
1491 {
1492         struct ip6_tnl *tunnel;
1493         int ret;
1494 
1495         ret = ip6gre_tunnel_init_common(dev);
1496         if (ret)
1497                 return ret;
1498 
1499         tunnel = netdev_priv(dev);
1500 
1501         if (tunnel->parms.collect_md)
1502                 return 0;
1503 
1504         memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1505         memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1506 
1507         if (ipv6_addr_any(&tunnel->parms.raddr))
1508                 dev->header_ops = &ip6gre_header_ops;
1509 
1510         return 0;
1511 }
1512 
1513 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1514 {
1515         struct ip6_tnl *tunnel = netdev_priv(dev);
1516 
1517         tunnel->dev = dev;
1518         tunnel->net = dev_net(dev);
1519         strcpy(tunnel->parms.name, dev->name);
1520 
1521         tunnel->hlen            = sizeof(struct ipv6hdr) + 4;
1522 
1523         dev_hold(dev);
1524 }
1525 
1526 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1527         .handler     = gre_rcv,
1528         .err_handler = ip6gre_err,
1529         .flags       = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1530 };
1531 
1532 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1533 {
1534         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1535         struct net_device *dev, *aux;
1536         int prio;
1537 
1538         for_each_netdev_safe(net, dev, aux)
1539                 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1540                     dev->rtnl_link_ops == &ip6gre_tap_ops ||
1541                     dev->rtnl_link_ops == &ip6erspan_tap_ops)
1542                         unregister_netdevice_queue(dev, head);
1543 
1544         for (prio = 0; prio < 4; prio++) {
1545                 int h;
1546                 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1547                         struct ip6_tnl *t;
1548 
1549                         t = rtnl_dereference(ign->tunnels[prio][h]);
1550 
1551                         while (t) {
1552                                 /* If dev is in the same netns, it has already
1553                                  * been added to the list by the previous loop.
1554                                  */
1555                                 if (!net_eq(dev_net(t->dev), net))
1556                                         unregister_netdevice_queue(t->dev,
1557                                                                    head);
1558                                 t = rtnl_dereference(t->next);
1559                         }
1560                 }
1561         }
1562 }
1563 
1564 static int __net_init ip6gre_init_net(struct net *net)
1565 {
1566         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1567         int err;
1568 
1569         if (!net_has_fallback_tunnels(net))
1570                 return 0;
1571         ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1572                                           NET_NAME_UNKNOWN,
1573                                           ip6gre_tunnel_setup);
1574         if (!ign->fb_tunnel_dev) {
1575                 err = -ENOMEM;
1576                 goto err_alloc_dev;
1577         }
1578         dev_net_set(ign->fb_tunnel_dev, net);
1579         /* FB netdevice is special: we have one, and only one per netns.
1580          * Allowing to move it to another netns is clearly unsafe.
1581          */
1582         ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1583 
1584 
1585         ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1586         ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1587 
1588         err = register_netdev(ign->fb_tunnel_dev);
1589         if (err)
1590                 goto err_reg_dev;
1591 
1592         rcu_assign_pointer(ign->tunnels_wc[0],
1593                            netdev_priv(ign->fb_tunnel_dev));
1594         return 0;
1595 
1596 err_reg_dev:
1597         free_netdev(ign->fb_tunnel_dev);
1598 err_alloc_dev:
1599         return err;
1600 }
1601 
1602 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1603 {
1604         struct net *net;
1605         LIST_HEAD(list);
1606 
1607         rtnl_lock();
1608         list_for_each_entry(net, net_list, exit_list)
1609                 ip6gre_destroy_tunnels(net, &list);
1610         unregister_netdevice_many(&list);
1611         rtnl_unlock();
1612 }
1613 
1614 static struct pernet_operations ip6gre_net_ops = {
1615         .init = ip6gre_init_net,
1616         .exit_batch = ip6gre_exit_batch_net,
1617         .id   = &ip6gre_net_id,
1618         .size = sizeof(struct ip6gre_net),
1619 };
1620 
1621 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1622                                   struct netlink_ext_ack *extack)
1623 {
1624         __be16 flags;
1625 
1626         if (!data)
1627                 return 0;
1628 
1629         flags = 0;
1630         if (data[IFLA_GRE_IFLAGS])
1631                 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1632         if (data[IFLA_GRE_OFLAGS])
1633                 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1634         if (flags & (GRE_VERSION|GRE_ROUTING))
1635                 return -EINVAL;
1636 
1637         return 0;
1638 }
1639 
1640 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1641                                struct netlink_ext_ack *extack)
1642 {
1643         struct in6_addr daddr;
1644 
1645         if (tb[IFLA_ADDRESS]) {
1646                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1647                         return -EINVAL;
1648                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1649                         return -EADDRNOTAVAIL;
1650         }
1651 
1652         if (!data)
1653                 goto out;
1654 
1655         if (data[IFLA_GRE_REMOTE]) {
1656                 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1657                 if (ipv6_addr_any(&daddr))
1658                         return -EINVAL;
1659         }
1660 
1661 out:
1662         return ip6gre_tunnel_validate(tb, data, extack);
1663 }
1664 
1665 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1666                                   struct netlink_ext_ack *extack)
1667 {
1668         __be16 flags = 0;
1669         int ret, ver = 0;
1670 
1671         if (!data)
1672                 return 0;
1673 
1674         ret = ip6gre_tap_validate(tb, data, extack);
1675         if (ret)
1676                 return ret;
1677 
1678         /* ERSPAN should only have GRE sequence and key flag */
1679         if (data[IFLA_GRE_OFLAGS])
1680                 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1681         if (data[IFLA_GRE_IFLAGS])
1682                 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1683         if (!data[IFLA_GRE_COLLECT_METADATA] &&
1684             flags != (GRE_SEQ | GRE_KEY))
1685                 return -EINVAL;
1686 
1687         /* ERSPAN Session ID only has 10-bit. Since we reuse
1688          * 32-bit key field as ID, check it's range.
1689          */
1690         if (data[IFLA_GRE_IKEY] &&
1691             (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1692                 return -EINVAL;
1693 
1694         if (data[IFLA_GRE_OKEY] &&
1695             (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1696                 return -EINVAL;
1697 
1698         if (data[IFLA_GRE_ERSPAN_VER]) {
1699                 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1700                 if (ver != 1 && ver != 2)
1701                         return -EINVAL;
1702         }
1703 
1704         if (ver == 1) {
1705                 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1706                         u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1707 
1708                         if (index & ~INDEX_MASK)
1709                                 return -EINVAL;
1710                 }
1711         } else if (ver == 2) {
1712                 if (data[IFLA_GRE_ERSPAN_DIR]) {
1713                         u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1714 
1715                         if (dir & ~(DIR_MASK >> DIR_OFFSET))
1716                                 return -EINVAL;
1717                 }
1718 
1719                 if (data[IFLA_GRE_ERSPAN_HWID]) {
1720                         u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1721 
1722                         if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1723                                 return -EINVAL;
1724                 }
1725         }
1726 
1727         return 0;
1728 }
1729 
1730 static void ip6gre_netlink_parms(struct nlattr *data[],
1731                                 struct __ip6_tnl_parm *parms)
1732 {
1733         memset(parms, 0, sizeof(*parms));
1734 
1735         if (!data)
1736                 return;
1737 
1738         if (data[IFLA_GRE_LINK])
1739                 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1740 
1741         if (data[IFLA_GRE_IFLAGS])
1742                 parms->i_flags = gre_flags_to_tnl_flags(
1743                                 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1744 
1745         if (data[IFLA_GRE_OFLAGS])
1746                 parms->o_flags = gre_flags_to_tnl_flags(
1747                                 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1748 
1749         if (data[IFLA_GRE_IKEY])
1750                 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1751 
1752         if (data[IFLA_GRE_OKEY])
1753                 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1754 
1755         if (data[IFLA_GRE_LOCAL])
1756                 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1757 
1758         if (data[IFLA_GRE_REMOTE])
1759                 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1760 
1761         if (data[IFLA_GRE_TTL])
1762                 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1763 
1764         if (data[IFLA_GRE_ENCAP_LIMIT])
1765                 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1766 
1767         if (data[IFLA_GRE_FLOWINFO])
1768                 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1769 
1770         if (data[IFLA_GRE_FLAGS])
1771                 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1772 
1773         if (data[IFLA_GRE_FWMARK])
1774                 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1775 
1776         if (data[IFLA_GRE_COLLECT_METADATA])
1777                 parms->collect_md = true;
1778 
1779         parms->erspan_ver = 1;
1780         if (data[IFLA_GRE_ERSPAN_VER])
1781                 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1782 
1783         if (parms->erspan_ver == 1) {
1784                 if (data[IFLA_GRE_ERSPAN_INDEX])
1785                         parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1786         } else if (parms->erspan_ver == 2) {
1787                 if (data[IFLA_GRE_ERSPAN_DIR])
1788                         parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1789                 if (data[IFLA_GRE_ERSPAN_HWID])
1790                         parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1791         }
1792 }
1793 
1794 static int ip6gre_tap_init(struct net_device *dev)
1795 {
1796         int ret;
1797 
1798         ret = ip6gre_tunnel_init_common(dev);
1799         if (ret)
1800                 return ret;
1801 
1802         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1803 
1804         return 0;
1805 }
1806 
1807 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1808         .ndo_init = ip6gre_tap_init,
1809         .ndo_uninit = ip6gre_tunnel_uninit,
1810         .ndo_start_xmit = ip6gre_tunnel_xmit,
1811         .ndo_set_mac_address = eth_mac_addr,
1812         .ndo_validate_addr = eth_validate_addr,
1813         .ndo_change_mtu = ip6_tnl_change_mtu,
1814         .ndo_get_stats64 = ip_tunnel_get_stats64,
1815         .ndo_get_iflink = ip6_tnl_get_iflink,
1816 };
1817 
1818 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1819 {
1820         int t_hlen;
1821 
1822         tunnel->tun_hlen = 8;
1823         tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1824                        erspan_hdr_len(tunnel->parms.erspan_ver);
1825 
1826         t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1827         tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1828         return t_hlen;
1829 }
1830 
1831 static int ip6erspan_tap_init(struct net_device *dev)
1832 {
1833         struct ip6_tnl *tunnel;
1834         int t_hlen;
1835         int ret;
1836 
1837         tunnel = netdev_priv(dev);
1838 
1839         tunnel->dev = dev;
1840         tunnel->net = dev_net(dev);
1841         strcpy(tunnel->parms.name, dev->name);
1842 
1843         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1844         if (!dev->tstats)
1845                 return -ENOMEM;
1846 
1847         ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1848         if (ret)
1849                 goto cleanup_alloc_pcpu_stats;
1850 
1851         ret = gro_cells_init(&tunnel->gro_cells, dev);
1852         if (ret)
1853                 goto cleanup_dst_cache_init;
1854 
1855         t_hlen = ip6erspan_calc_hlen(tunnel);
1856         dev->mtu = ETH_DATA_LEN - t_hlen;
1857         if (dev->type == ARPHRD_ETHER)
1858                 dev->mtu -= ETH_HLEN;
1859         if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1860                 dev->mtu -= 8;
1861 
1862         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1863         ip6erspan_tnl_link_config(tunnel, 1);
1864 
1865         return 0;
1866 
1867 cleanup_dst_cache_init:
1868         dst_cache_destroy(&tunnel->dst_cache);
1869 cleanup_alloc_pcpu_stats:
1870         free_percpu(dev->tstats);
1871         dev->tstats = NULL;
1872         return ret;
1873 }
1874 
1875 static const struct net_device_ops ip6erspan_netdev_ops = {
1876         .ndo_init =             ip6erspan_tap_init,
1877         .ndo_uninit =           ip6erspan_tunnel_uninit,
1878         .ndo_start_xmit =       ip6erspan_tunnel_xmit,
1879         .ndo_set_mac_address =  eth_mac_addr,
1880         .ndo_validate_addr =    eth_validate_addr,
1881         .ndo_change_mtu =       ip6_tnl_change_mtu,
1882         .ndo_get_stats64 =      ip_tunnel_get_stats64,
1883         .ndo_get_iflink =       ip6_tnl_get_iflink,
1884 };
1885 
1886 static void ip6gre_tap_setup(struct net_device *dev)
1887 {
1888 
1889         ether_setup(dev);
1890 
1891         dev->max_mtu = 0;
1892         dev->netdev_ops = &ip6gre_tap_netdev_ops;
1893         dev->needs_free_netdev = true;
1894         dev->priv_destructor = ip6gre_dev_free;
1895 
1896         dev->features |= NETIF_F_NETNS_LOCAL;
1897         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1898         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1899         netif_keep_dst(dev);
1900 }
1901 
1902 bool is_ip6gretap_dev(const struct net_device *dev)
1903 {
1904         return dev->netdev_ops == &ip6gre_tap_netdev_ops;
1905 }
1906 EXPORT_SYMBOL_GPL(is_ip6gretap_dev);
1907 
1908 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1909                                        struct ip_tunnel_encap *ipencap)
1910 {
1911         bool ret = false;
1912 
1913         memset(ipencap, 0, sizeof(*ipencap));
1914 
1915         if (!data)
1916                 return ret;
1917 
1918         if (data[IFLA_GRE_ENCAP_TYPE]) {
1919                 ret = true;
1920                 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1921         }
1922 
1923         if (data[IFLA_GRE_ENCAP_FLAGS]) {
1924                 ret = true;
1925                 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1926         }
1927 
1928         if (data[IFLA_GRE_ENCAP_SPORT]) {
1929                 ret = true;
1930                 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1931         }
1932 
1933         if (data[IFLA_GRE_ENCAP_DPORT]) {
1934                 ret = true;
1935                 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1936         }
1937 
1938         return ret;
1939 }
1940 
1941 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1942                                  struct nlattr *tb[], struct nlattr *data[],
1943                                  struct netlink_ext_ack *extack)
1944 {
1945         struct ip6_tnl *nt;
1946         struct ip_tunnel_encap ipencap;
1947         int err;
1948 
1949         nt = netdev_priv(dev);
1950 
1951         if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1952                 int err = ip6_tnl_encap_setup(nt, &ipencap);
1953 
1954                 if (err < 0)
1955                         return err;
1956         }
1957 
1958         if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1959                 eth_hw_addr_random(dev);
1960 
1961         nt->dev = dev;
1962         nt->net = dev_net(dev);
1963 
1964         err = register_netdevice(dev);
1965         if (err)
1966                 goto out;
1967 
1968         if (tb[IFLA_MTU])
1969                 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1970 
1971         dev_hold(dev);
1972 
1973 out:
1974         return err;
1975 }
1976 
1977 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1978                           struct nlattr *tb[], struct nlattr *data[],
1979                           struct netlink_ext_ack *extack)
1980 {
1981         struct ip6_tnl *nt = netdev_priv(dev);
1982         struct net *net = dev_net(dev);
1983         struct ip6gre_net *ign;
1984         int err;
1985 
1986         ip6gre_netlink_parms(data, &nt->parms);
1987         ign = net_generic(net, ip6gre_net_id);
1988 
1989         if (nt->parms.collect_md) {
1990                 if (rtnl_dereference(ign->collect_md_tun))
1991                         return -EEXIST;
1992         } else {
1993                 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1994                         return -EEXIST;
1995         }
1996 
1997         err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
1998         if (!err) {
1999                 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
2000                 ip6gre_tunnel_link_md(ign, nt);
2001                 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2002         }
2003         return err;
2004 }
2005 
2006 static struct ip6_tnl *
2007 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2008                          struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2009                          struct netlink_ext_ack *extack)
2010 {
2011         struct ip6_tnl *t, *nt = netdev_priv(dev);
2012         struct net *net = nt->net;
2013         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2014         struct ip_tunnel_encap ipencap;
2015 
2016         if (dev == ign->fb_tunnel_dev)
2017                 return ERR_PTR(-EINVAL);
2018 
2019         if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2020                 int err = ip6_tnl_encap_setup(nt, &ipencap);
2021 
2022                 if (err < 0)
2023                         return ERR_PTR(err);
2024         }
2025 
2026         ip6gre_netlink_parms(data, p_p);
2027 
2028         t = ip6gre_tunnel_locate(net, p_p, 0);
2029 
2030         if (t) {
2031                 if (t->dev != dev)
2032                         return ERR_PTR(-EEXIST);
2033         } else {
2034                 t = nt;
2035         }
2036 
2037         return t;
2038 }
2039 
2040 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2041                              struct nlattr *data[],
2042                              struct netlink_ext_ack *extack)
2043 {
2044         struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2045         struct __ip6_tnl_parm p;
2046         struct ip6_tnl *t;
2047 
2048         t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2049         if (IS_ERR(t))
2050                 return PTR_ERR(t);
2051 
2052         ip6gre_tunnel_unlink_md(ign, t);
2053         ip6gre_tunnel_unlink(ign, t);
2054         ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2055         ip6gre_tunnel_link_md(ign, t);
2056         ip6gre_tunnel_link(ign, t);
2057         return 0;
2058 }
2059 
2060 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2061 {
2062         struct net *net = dev_net(dev);
2063         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2064 
2065         if (dev != ign->fb_tunnel_dev)
2066                 unregister_netdevice_queue(dev, head);
2067 }
2068 
2069 static size_t ip6gre_get_size(const struct net_device *dev)
2070 {
2071         return
2072                 /* IFLA_GRE_LINK */
2073                 nla_total_size(4) +
2074                 /* IFLA_GRE_IFLAGS */
2075                 nla_total_size(2) +
2076                 /* IFLA_GRE_OFLAGS */
2077                 nla_total_size(2) +
2078                 /* IFLA_GRE_IKEY */
2079                 nla_total_size(4) +
2080                 /* IFLA_GRE_OKEY */
2081                 nla_total_size(4) +
2082                 /* IFLA_GRE_LOCAL */
2083                 nla_total_size(sizeof(struct in6_addr)) +
2084                 /* IFLA_GRE_REMOTE */
2085                 nla_total_size(sizeof(struct in6_addr)) +
2086                 /* IFLA_GRE_TTL */
2087                 nla_total_size(1) +
2088                 /* IFLA_GRE_ENCAP_LIMIT */
2089                 nla_total_size(1) +
2090                 /* IFLA_GRE_FLOWINFO */
2091                 nla_total_size(4) +
2092                 /* IFLA_GRE_FLAGS */
2093                 nla_total_size(4) +
2094                 /* IFLA_GRE_ENCAP_TYPE */
2095                 nla_total_size(2) +
2096                 /* IFLA_GRE_ENCAP_FLAGS */
2097                 nla_total_size(2) +
2098                 /* IFLA_GRE_ENCAP_SPORT */
2099                 nla_total_size(2) +
2100                 /* IFLA_GRE_ENCAP_DPORT */
2101                 nla_total_size(2) +
2102                 /* IFLA_GRE_COLLECT_METADATA */
2103                 nla_total_size(0) +
2104                 /* IFLA_GRE_FWMARK */
2105                 nla_total_size(4) +
2106                 /* IFLA_GRE_ERSPAN_INDEX */
2107                 nla_total_size(4) +
2108                 0;
2109 }
2110 
2111 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2112 {
2113         struct ip6_tnl *t = netdev_priv(dev);
2114         struct __ip6_tnl_parm *p = &t->parms;
2115 
2116         if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2117             nla_put_be16(skb, IFLA_GRE_IFLAGS,
2118                          gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2119             nla_put_be16(skb, IFLA_GRE_OFLAGS,
2120                          gre_tnl_flags_to_gre_flags(p->o_flags)) ||
2121             nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2122             nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2123             nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2124             nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2125             nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2126             nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2127             nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2128             nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2129             nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark) ||
2130             nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2131                 goto nla_put_failure;
2132 
2133         if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2134                         t->encap.type) ||
2135             nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2136                          t->encap.sport) ||
2137             nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2138                          t->encap.dport) ||
2139             nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2140                         t->encap.flags))
2141                 goto nla_put_failure;
2142 
2143         if (p->collect_md) {
2144                 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2145                         goto nla_put_failure;
2146         }
2147 
2148         if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2149                 goto nla_put_failure;
2150 
2151         if (p->erspan_ver == 1) {
2152                 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2153                         goto nla_put_failure;
2154         } else if (p->erspan_ver == 2) {
2155                 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2156                         goto nla_put_failure;
2157                 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2158                         goto nla_put_failure;
2159         }
2160 
2161         return 0;
2162 
2163 nla_put_failure:
2164         return -EMSGSIZE;
2165 }
2166 
2167 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2168         [IFLA_GRE_LINK]        = { .type = NLA_U32 },
2169         [IFLA_GRE_IFLAGS]      = { .type = NLA_U16 },
2170         [IFLA_GRE_OFLAGS]      = { .type = NLA_U16 },
2171         [IFLA_GRE_IKEY]        = { .type = NLA_U32 },
2172         [IFLA_GRE_OKEY]        = { .type = NLA_U32 },
2173         [IFLA_GRE_LOCAL]       = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
2174         [IFLA_GRE_REMOTE]      = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
2175         [IFLA_GRE_TTL]         = { .type = NLA_U8 },
2176         [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2177         [IFLA_GRE_FLOWINFO]    = { .type = NLA_U32 },
2178         [IFLA_GRE_FLAGS]       = { .type = NLA_U32 },
2179         [IFLA_GRE_ENCAP_TYPE]   = { .type = NLA_U16 },
2180         [IFLA_GRE_ENCAP_FLAGS]  = { .type = NLA_U16 },
2181         [IFLA_GRE_ENCAP_SPORT]  = { .type = NLA_U16 },
2182         [IFLA_GRE_ENCAP_DPORT]  = { .type = NLA_U16 },
2183         [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2184         [IFLA_GRE_FWMARK]       = { .type = NLA_U32 },
2185         [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2186         [IFLA_GRE_ERSPAN_VER]   = { .type = NLA_U8 },
2187         [IFLA_GRE_ERSPAN_DIR]   = { .type = NLA_U8 },
2188         [IFLA_GRE_ERSPAN_HWID]  = { .type = NLA_U16 },
2189 };
2190 
2191 static void ip6erspan_tap_setup(struct net_device *dev)
2192 {
2193         ether_setup(dev);
2194 
2195         dev->netdev_ops = &ip6erspan_netdev_ops;
2196         dev->needs_free_netdev = true;
2197         dev->priv_destructor = ip6gre_dev_free;
2198 
2199         dev->features |= NETIF_F_NETNS_LOCAL;
2200         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2201         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2202         netif_keep_dst(dev);
2203 }
2204 
2205 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2206                              struct nlattr *tb[], struct nlattr *data[],
2207                              struct netlink_ext_ack *extack)
2208 {
2209         struct ip6_tnl *nt = netdev_priv(dev);
2210         struct net *net = dev_net(dev);
2211         struct ip6gre_net *ign;
2212         int err;
2213 
2214         ip6gre_netlink_parms(data, &nt->parms);
2215         ign = net_generic(net, ip6gre_net_id);
2216 
2217         if (nt->parms.collect_md) {
2218                 if (rtnl_dereference(ign->collect_md_tun_erspan))
2219                         return -EEXIST;
2220         } else {
2221                 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2222                         return -EEXIST;
2223         }
2224 
2225         err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2226         if (!err) {
2227                 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2228                 ip6erspan_tunnel_link_md(ign, nt);
2229                 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2230         }
2231         return err;
2232 }
2233 
2234 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2235 {
2236         ip6gre_tnl_link_config_common(t);
2237         ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2238 }
2239 
2240 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2241                                 const struct __ip6_tnl_parm *p, int set_mtu)
2242 {
2243         ip6gre_tnl_copy_tnl_parm(t, p);
2244         ip6erspan_tnl_link_config(t, set_mtu);
2245         return 0;
2246 }
2247 
2248 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2249                                 struct nlattr *data[],
2250                                 struct netlink_ext_ack *extack)
2251 {
2252         struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2253         struct __ip6_tnl_parm p;
2254         struct ip6_tnl *t;
2255 
2256         t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2257         if (IS_ERR(t))
2258                 return PTR_ERR(t);
2259 
2260         ip6gre_tunnel_unlink_md(ign, t);
2261         ip6gre_tunnel_unlink(ign, t);
2262         ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2263         ip6erspan_tunnel_link_md(ign, t);
2264         ip6gre_tunnel_link(ign, t);
2265         return 0;
2266 }
2267 
2268 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2269         .kind           = "ip6gre",
2270         .maxtype        = IFLA_GRE_MAX,
2271         .policy         = ip6gre_policy,
2272         .priv_size      = sizeof(struct ip6_tnl),
2273         .setup          = ip6gre_tunnel_setup,
2274         .validate       = ip6gre_tunnel_validate,
2275         .newlink        = ip6gre_newlink,
2276         .changelink     = ip6gre_changelink,
2277         .dellink        = ip6gre_dellink,
2278         .get_size       = ip6gre_get_size,
2279         .fill_info      = ip6gre_fill_info,
2280         .get_link_net   = ip6_tnl_get_link_net,
2281 };
2282 
2283 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2284         .kind           = "ip6gretap",
2285         .maxtype        = IFLA_GRE_MAX,
2286         .policy         = ip6gre_policy,
2287         .priv_size      = sizeof(struct ip6_tnl),
2288         .setup          = ip6gre_tap_setup,
2289         .validate       = ip6gre_tap_validate,
2290         .newlink        = ip6gre_newlink,
2291         .changelink     = ip6gre_changelink,
2292         .get_size       = ip6gre_get_size,
2293         .fill_info      = ip6gre_fill_info,
2294         .get_link_net   = ip6_tnl_get_link_net,
2295 };
2296 
2297 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2298         .kind           = "ip6erspan",
2299         .maxtype        = IFLA_GRE_MAX,
2300         .policy         = ip6gre_policy,
2301         .priv_size      = sizeof(struct ip6_tnl),
2302         .setup          = ip6erspan_tap_setup,
2303         .validate       = ip6erspan_tap_validate,
2304         .newlink        = ip6erspan_newlink,
2305         .changelink     = ip6erspan_changelink,
2306         .get_size       = ip6gre_get_size,
2307         .fill_info      = ip6gre_fill_info,
2308         .get_link_net   = ip6_tnl_get_link_net,
2309 };
2310 
2311 /*
2312  *      And now the modules code and kernel interface.
2313  */
2314 
2315 static int __init ip6gre_init(void)
2316 {
2317         int err;
2318 
2319         pr_info("GRE over IPv6 tunneling driver\n");
2320 
2321         err = register_pernet_device(&ip6gre_net_ops);
2322         if (err < 0)
2323                 return err;
2324 
2325         err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2326         if (err < 0) {
2327                 pr_info("%s: can't add protocol\n", __func__);
2328                 goto add_proto_failed;
2329         }
2330 
2331         err = rtnl_link_register(&ip6gre_link_ops);
2332         if (err < 0)
2333                 goto rtnl_link_failed;
2334 
2335         err = rtnl_link_register(&ip6gre_tap_ops);
2336         if (err < 0)
2337                 goto tap_ops_failed;
2338 
2339         err = rtnl_link_register(&ip6erspan_tap_ops);
2340         if (err < 0)
2341                 goto erspan_link_failed;
2342 
2343 out:
2344         return err;
2345 
2346 erspan_link_failed:
2347         rtnl_link_unregister(&ip6gre_tap_ops);
2348 tap_ops_failed:
2349         rtnl_link_unregister(&ip6gre_link_ops);
2350 rtnl_link_failed:
2351         inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2352 add_proto_failed:
2353         unregister_pernet_device(&ip6gre_net_ops);
2354         goto out;
2355 }
2356 
2357 static void __exit ip6gre_fini(void)
2358 {
2359         rtnl_link_unregister(&ip6gre_tap_ops);
2360         rtnl_link_unregister(&ip6gre_link_ops);
2361         rtnl_link_unregister(&ip6erspan_tap_ops);
2362         inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2363         unregister_pernet_device(&ip6gre_net_ops);
2364 }
2365 
2366 module_init(ip6gre_init);
2367 module_exit(ip6gre_fini);
2368 MODULE_LICENSE("GPL");
2369 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2370 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2371 MODULE_ALIAS_RTNL_LINK("ip6gre");
2372 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2373 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2374 MODULE_ALIAS_NETDEV("ip6gre0");
2375 

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