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driver core: Partially revert "driver core: correct device's shutdown order"
[linux-2.6/btrfs-unstable.git] / net / ipv6 / ip6_gre.c
blobc8cf2fdbb13b88cc1bf6b494a75407cdc16977eb
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 ipv6hdr *ipv6h = ipv6_hdr(skb);
931 struct ip6_tnl *t = netdev_priv(dev);
932 struct dst_entry *dst = skb_dst(skb);
933 struct net_device_stats *stats;
934 bool truncate = false;
935 int encap_limit = -1;
936 __u8 dsfield = false;
937 struct flowi6 fl6;
938 int err = -EINVAL;
939 __u32 mtu;
940 int nhoff;
941 int thoff;
942
943 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
944 goto tx_err;
945
946 if (gre_handle_offloads(skb, false))
947 goto tx_err;
948
949 if (skb->len > dev->mtu + dev->hard_header_len) {
950 pskb_trim(skb, dev->mtu + dev->hard_header_len);
951 truncate = true;
952 }
953
954 nhoff = skb_network_header(skb) - skb_mac_header(skb);
955 if (skb->protocol == htons(ETH_P_IP) &&
956 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
957 truncate = true;
958
959 thoff = skb_transport_header(skb) - skb_mac_header(skb);
960 if (skb->protocol == htons(ETH_P_IPV6) &&
961 (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff))
962 truncate = true;
963
964 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
965 goto tx_err;
966
967 t->parms.o_flags &= ~TUNNEL_KEY;
968 IPCB(skb)->flags = 0;
969
970 /* For collect_md mode, derive fl6 from the tunnel key,
971 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
972 */
973 if (t->parms.collect_md) {
974 struct ip_tunnel_info *tun_info;
975 const struct ip_tunnel_key *key;
976 struct erspan_metadata *md;
977 __be32 tun_id;
978
979 tun_info = skb_tunnel_info(skb);
980 if (unlikely(!tun_info ||
981 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
982 ip_tunnel_info_af(tun_info) != AF_INET6))
983 return -EINVAL;
984
985 key = &tun_info->key;
986 memset(&fl6, 0, sizeof(fl6));
987 fl6.flowi6_proto = IPPROTO_GRE;
988 fl6.daddr = key->u.ipv6.dst;
989 fl6.flowlabel = key->label;
990 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
991
992 dsfield = key->tos;
993 md = ip_tunnel_info_opts(tun_info);
994 if (!md)
995 goto tx_err;
996
997 tun_id = tunnel_id_to_key32(key->tun_id);
998 if (md->version == 1) {
999 erspan_build_header(skb,
1000 ntohl(tun_id),
1001 ntohl(md->u.index), truncate,
1002 false);
1003 } else if (md->version == 2) {
1004 erspan_build_header_v2(skb,
1005 ntohl(tun_id),
1006 md->u.md2.dir,
1007 get_hwid(&md->u.md2),
1008 truncate, false);
1009 } else {
1010 goto tx_err;
1011 }
1012 } else {
1013 switch (skb->protocol) {
1014 case htons(ETH_P_IP):
1015 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1016 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1017 &dsfield, &encap_limit);
1018 break;
1019 case htons(ETH_P_IPV6):
1020 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
1021 goto tx_err;
1022 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1023 &dsfield, &encap_limit))
1024 goto tx_err;
1025 break;
1026 default:
1027 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1028 break;
1029 }
1030
1031 if (t->parms.erspan_ver == 1)
1032 erspan_build_header(skb, ntohl(t->parms.o_key),
1033 t->parms.index,
1034 truncate, false);
1035 else if (t->parms.erspan_ver == 2)
1036 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1037 t->parms.dir,
1038 t->parms.hwid,
1039 truncate, false);
1040 else
1041 goto tx_err;
1042
1043 fl6.daddr = t->parms.raddr;
1044 }
1045
1046 /* Push GRE header. */
1047 gre_build_header(skb, 8, TUNNEL_SEQ,
1048 htons(ETH_P_ERSPAN), 0, htonl(t->o_seqno++));
1049
1050 /* TooBig packet may have updated dst->dev's mtu */
1051 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1052 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu);
1053
1054 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1055 NEXTHDR_GRE);
1056 if (err != 0) {
1057 /* XXX: send ICMP error even if DF is not set. */
1058 if (err == -EMSGSIZE) {
1059 if (skb->protocol == htons(ETH_P_IP))
1060 icmp_send(skb, ICMP_DEST_UNREACH,
1061 ICMP_FRAG_NEEDED, htonl(mtu));
1062 else
1063 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1064 }
1065
1066 goto tx_err;
1067 }
1068 return NETDEV_TX_OK;
1069
1070 tx_err:
1071 stats = &t->dev->stats;
1072 stats->tx_errors++;
1073 stats->tx_dropped++;
1074 kfree_skb(skb);
1075 return NETDEV_TX_OK;
1076 }
1077
1078 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1079 {
1080 struct net_device *dev = t->dev;
1081 struct __ip6_tnl_parm *p = &t->parms;
1082 struct flowi6 *fl6 = &t->fl.u.ip6;
1083
1084 if (dev->type != ARPHRD_ETHER) {
1085 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1086 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1087 }
1088
1089 /* Set up flowi template */
1090 fl6->saddr = p->laddr;
1091 fl6->daddr = p->raddr;
1092 fl6->flowi6_oif = p->link;
1093 fl6->flowlabel = 0;
1094 fl6->flowi6_proto = IPPROTO_GRE;
1095
1096 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1097 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1098 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1099 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1100
1101 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1102 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1103
1104 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1105 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1106 dev->flags |= IFF_POINTOPOINT;
1107 else
1108 dev->flags &= ~IFF_POINTOPOINT;
1109 }
1110
1111 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1112 int t_hlen)
1113 {
1114 const struct __ip6_tnl_parm *p = &t->parms;
1115 struct net_device *dev = t->dev;
1116
1117 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1118 int strict = (ipv6_addr_type(&p->raddr) &
1119 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1120
1121 struct rt6_info *rt = rt6_lookup(t->net,
1122 &p->raddr, &p->laddr,
1123 p->link, NULL, strict);
1124
1125 if (!rt)
1126 return;
1127
1128 if (rt->dst.dev) {
1129 dev->hard_header_len = rt->dst.dev->hard_header_len +
1130 t_hlen;
1131
1132 if (set_mtu) {
1133 dev->mtu = rt->dst.dev->mtu - t_hlen;
1134 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1135 dev->mtu -= 8;
1136 if (dev->type == ARPHRD_ETHER)
1137 dev->mtu -= ETH_HLEN;
1138
1139 if (dev->mtu < IPV6_MIN_MTU)
1140 dev->mtu = IPV6_MIN_MTU;
1141 }
1142 }
1143 ip6_rt_put(rt);
1144 }
1145 }
1146
1147 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1148 {
1149 int t_hlen;
1150
1151 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1152 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1153
1154 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1155 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1156 return t_hlen;
1157 }
1158
1159 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1160 {
1161 ip6gre_tnl_link_config_common(t);
1162 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1163 }
1164
1165 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1166 const struct __ip6_tnl_parm *p)
1167 {
1168 t->parms.laddr = p->laddr;
1169 t->parms.raddr = p->raddr;
1170 t->parms.flags = p->flags;
1171 t->parms.hop_limit = p->hop_limit;
1172 t->parms.encap_limit = p->encap_limit;
1173 t->parms.flowinfo = p->flowinfo;
1174 t->parms.link = p->link;
1175 t->parms.proto = p->proto;
1176 t->parms.i_key = p->i_key;
1177 t->parms.o_key = p->o_key;
1178 t->parms.i_flags = p->i_flags;
1179 t->parms.o_flags = p->o_flags;
1180 t->parms.fwmark = p->fwmark;
1181 dst_cache_reset(&t->dst_cache);
1182 }
1183
1184 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1185 int set_mtu)
1186 {
1187 ip6gre_tnl_copy_tnl_parm(t, p);
1188 ip6gre_tnl_link_config(t, set_mtu);
1189 return 0;
1190 }
1191
1192 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1193 const struct ip6_tnl_parm2 *u)
1194 {
1195 p->laddr = u->laddr;
1196 p->raddr = u->raddr;
1197 p->flags = u->flags;
1198 p->hop_limit = u->hop_limit;
1199 p->encap_limit = u->encap_limit;
1200 p->flowinfo = u->flowinfo;
1201 p->link = u->link;
1202 p->i_key = u->i_key;
1203 p->o_key = u->o_key;
1204 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1205 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1206 memcpy(p->name, u->name, sizeof(u->name));
1207 }
1208
1209 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1210 const struct __ip6_tnl_parm *p)
1211 {
1212 u->proto = IPPROTO_GRE;
1213 u->laddr = p->laddr;
1214 u->raddr = p->raddr;
1215 u->flags = p->flags;
1216 u->hop_limit = p->hop_limit;
1217 u->encap_limit = p->encap_limit;
1218 u->flowinfo = p->flowinfo;
1219 u->link = p->link;
1220 u->i_key = p->i_key;
1221 u->o_key = p->o_key;
1222 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1223 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1224 memcpy(u->name, p->name, sizeof(u->name));
1225 }
1226
1227 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1228 struct ifreq *ifr, int cmd)
1229 {
1230 int err = 0;
1231 struct ip6_tnl_parm2 p;
1232 struct __ip6_tnl_parm p1;
1233 struct ip6_tnl *t = netdev_priv(dev);
1234 struct net *net = t->net;
1235 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1236
1237 memset(&p1, 0, sizeof(p1));
1238
1239 switch (cmd) {
1240 case SIOCGETTUNNEL:
1241 if (dev == ign->fb_tunnel_dev) {
1242 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1243 err = -EFAULT;
1244 break;
1245 }
1246 ip6gre_tnl_parm_from_user(&p1, &p);
1247 t = ip6gre_tunnel_locate(net, &p1, 0);
1248 if (!t)
1249 t = netdev_priv(dev);
1250 }
1251 memset(&p, 0, sizeof(p));
1252 ip6gre_tnl_parm_to_user(&p, &t->parms);
1253 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1254 err = -EFAULT;
1255 break;
1256
1257 case SIOCADDTUNNEL:
1258 case SIOCCHGTUNNEL:
1259 err = -EPERM;
1260 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1261 goto done;
1262
1263 err = -EFAULT;
1264 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1265 goto done;
1266
1267 err = -EINVAL;
1268 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1269 goto done;
1270
1271 if (!(p.i_flags&GRE_KEY))
1272 p.i_key = 0;
1273 if (!(p.o_flags&GRE_KEY))
1274 p.o_key = 0;
1275
1276 ip6gre_tnl_parm_from_user(&p1, &p);
1277 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1278
1279 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1280 if (t) {
1281 if (t->dev != dev) {
1282 err = -EEXIST;
1283 break;
1284 }
1285 } else {
1286 t = netdev_priv(dev);
1287
1288 ip6gre_tunnel_unlink(ign, t);
1289 synchronize_net();
1290 ip6gre_tnl_change(t, &p1, 1);
1291 ip6gre_tunnel_link(ign, t);
1292 netdev_state_change(dev);
1293 }
1294 }
1295
1296 if (t) {
1297 err = 0;
1298
1299 memset(&p, 0, sizeof(p));
1300 ip6gre_tnl_parm_to_user(&p, &t->parms);
1301 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1302 err = -EFAULT;
1303 } else
1304 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1305 break;
1306
1307 case SIOCDELTUNNEL:
1308 err = -EPERM;
1309 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1310 goto done;
1311
1312 if (dev == ign->fb_tunnel_dev) {
1313 err = -EFAULT;
1314 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1315 goto done;
1316 err = -ENOENT;
1317 ip6gre_tnl_parm_from_user(&p1, &p);
1318 t = ip6gre_tunnel_locate(net, &p1, 0);
1319 if (!t)
1320 goto done;
1321 err = -EPERM;
1322 if (t == netdev_priv(ign->fb_tunnel_dev))
1323 goto done;
1324 dev = t->dev;
1325 }
1326 unregister_netdevice(dev);
1327 err = 0;
1328 break;
1329
1330 default:
1331 err = -EINVAL;
1332 }
1333
1334 done:
1335 return err;
1336 }
1337
1338 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1339 unsigned short type, const void *daddr,
1340 const void *saddr, unsigned int len)
1341 {
1342 struct ip6_tnl *t = netdev_priv(dev);
1343 struct ipv6hdr *ipv6h;
1344 __be16 *p;
1345
1346 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1347 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1348 t->fl.u.ip6.flowlabel,
1349 true, &t->fl.u.ip6));
1350 ipv6h->hop_limit = t->parms.hop_limit;
1351 ipv6h->nexthdr = NEXTHDR_GRE;
1352 ipv6h->saddr = t->parms.laddr;
1353 ipv6h->daddr = t->parms.raddr;
1354
1355 p = (__be16 *)(ipv6h + 1);
1356 p[0] = t->parms.o_flags;
1357 p[1] = htons(type);
1358
1359 /*
1360 * Set the source hardware address.
1361 */
1362
1363 if (saddr)
1364 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1365 if (daddr)
1366 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1367 if (!ipv6_addr_any(&ipv6h->daddr))
1368 return t->hlen;
1369
1370 return -t->hlen;
1371 }
1372
1373 static const struct header_ops ip6gre_header_ops = {
1374 .create = ip6gre_header,
1375 };
1376
1377 static const struct net_device_ops ip6gre_netdev_ops = {
1378 .ndo_init = ip6gre_tunnel_init,
1379 .ndo_uninit = ip6gre_tunnel_uninit,
1380 .ndo_start_xmit = ip6gre_tunnel_xmit,
1381 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1382 .ndo_change_mtu = ip6_tnl_change_mtu,
1383 .ndo_get_stats64 = ip_tunnel_get_stats64,
1384 .ndo_get_iflink = ip6_tnl_get_iflink,
1385 };
1386
1387 static void ip6gre_dev_free(struct net_device *dev)
1388 {
1389 struct ip6_tnl *t = netdev_priv(dev);
1390
1391 gro_cells_destroy(&t->gro_cells);
1392 dst_cache_destroy(&t->dst_cache);
1393 free_percpu(dev->tstats);
1394 }
1395
1396 static void ip6gre_tunnel_setup(struct net_device *dev)
1397 {
1398 dev->netdev_ops = &ip6gre_netdev_ops;
1399 dev->needs_free_netdev = true;
1400 dev->priv_destructor = ip6gre_dev_free;
1401
1402 dev->type = ARPHRD_IP6GRE;
1403
1404 dev->flags |= IFF_NOARP;
1405 dev->addr_len = sizeof(struct in6_addr);
1406 netif_keep_dst(dev);
1407 /* This perm addr will be used as interface identifier by IPv6 */
1408 dev->addr_assign_type = NET_ADDR_RANDOM;
1409 eth_random_addr(dev->perm_addr);
1410 }
1411
1412 #define GRE6_FEATURES (NETIF_F_SG | \
1413 NETIF_F_FRAGLIST | \
1414 NETIF_F_HIGHDMA | \
1415 NETIF_F_HW_CSUM)
1416
1417 static void ip6gre_tnl_init_features(struct net_device *dev)
1418 {
1419 struct ip6_tnl *nt = netdev_priv(dev);
1420
1421 dev->features |= GRE6_FEATURES;
1422 dev->hw_features |= GRE6_FEATURES;
1423
1424 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1425 /* TCP offload with GRE SEQ is not supported, nor
1426 * can we support 2 levels of outer headers requiring
1427 * an update.
1428 */
1429 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1430 nt->encap.type == TUNNEL_ENCAP_NONE) {
1431 dev->features |= NETIF_F_GSO_SOFTWARE;
1432 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1433 }
1434
1435 /* Can use a lockless transmit, unless we generate
1436 * output sequences
1437 */
1438 dev->features |= NETIF_F_LLTX;
1439 }
1440 }
1441
1442 static int ip6gre_tunnel_init_common(struct net_device *dev)
1443 {
1444 struct ip6_tnl *tunnel;
1445 int ret;
1446 int t_hlen;
1447
1448 tunnel = netdev_priv(dev);
1449
1450 tunnel->dev = dev;
1451 tunnel->net = dev_net(dev);
1452 strcpy(tunnel->parms.name, dev->name);
1453
1454 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1455 if (!dev->tstats)
1456 return -ENOMEM;
1457
1458 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1459 if (ret)
1460 goto cleanup_alloc_pcpu_stats;
1461
1462 ret = gro_cells_init(&tunnel->gro_cells, dev);
1463 if (ret)
1464 goto cleanup_dst_cache_init;
1465
1466 t_hlen = ip6gre_calc_hlen(tunnel);
1467 dev->mtu = ETH_DATA_LEN - t_hlen;
1468 if (dev->type == ARPHRD_ETHER)
1469 dev->mtu -= ETH_HLEN;
1470 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1471 dev->mtu -= 8;
1472
1473 if (tunnel->parms.collect_md) {
1474 dev->features |= NETIF_F_NETNS_LOCAL;
1475 netif_keep_dst(dev);
1476 }
1477 ip6gre_tnl_init_features(dev);
1478
1479 return 0;
1480
1481 cleanup_dst_cache_init:
1482 dst_cache_destroy(&tunnel->dst_cache);
1483 cleanup_alloc_pcpu_stats:
1484 free_percpu(dev->tstats);
1485 dev->tstats = NULL;
1486 return ret;
1487 }
1488
1489 static int ip6gre_tunnel_init(struct net_device *dev)
1490 {
1491 struct ip6_tnl *tunnel;
1492 int ret;
1493
1494 ret = ip6gre_tunnel_init_common(dev);
1495 if (ret)
1496 return ret;
1497
1498 tunnel = netdev_priv(dev);
1499
1500 if (tunnel->parms.collect_md)
1501 return 0;
1502
1503 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1504 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1505
1506 if (ipv6_addr_any(&tunnel->parms.raddr))
1507 dev->header_ops = &ip6gre_header_ops;
1508
1509 return 0;
1510 }
1511
1512 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1513 {
1514 struct ip6_tnl *tunnel = netdev_priv(dev);
1515
1516 tunnel->dev = dev;
1517 tunnel->net = dev_net(dev);
1518 strcpy(tunnel->parms.name, dev->name);
1519
1520 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1521
1522 dev_hold(dev);
1523 }
1524
1525 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1526 .handler = gre_rcv,
1527 .err_handler = ip6gre_err,
1528 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1529 };
1530
1531 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1532 {
1533 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1534 struct net_device *dev, *aux;
1535 int prio;
1536
1537 for_each_netdev_safe(net, dev, aux)
1538 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1539 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1540 dev->rtnl_link_ops == &ip6erspan_tap_ops)
1541 unregister_netdevice_queue(dev, head);
1542
1543 for (prio = 0; prio < 4; prio++) {
1544 int h;
1545 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1546 struct ip6_tnl *t;
1547
1548 t = rtnl_dereference(ign->tunnels[prio][h]);
1549
1550 while (t) {
1551 /* If dev is in the same netns, it has already
1552 * been added to the list by the previous loop.
1553 */
1554 if (!net_eq(dev_net(t->dev), net))
1555 unregister_netdevice_queue(t->dev,
1556 head);
1557 t = rtnl_dereference(t->next);
1558 }
1559 }
1560 }
1561 }
1562
1563 static int __net_init ip6gre_init_net(struct net *net)
1564 {
1565 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1566 int err;
1567
1568 if (!net_has_fallback_tunnels(net))
1569 return 0;
1570 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1571 NET_NAME_UNKNOWN,
1572 ip6gre_tunnel_setup);
1573 if (!ign->fb_tunnel_dev) {
1574 err = -ENOMEM;
1575 goto err_alloc_dev;
1576 }
1577 dev_net_set(ign->fb_tunnel_dev, net);
1578 /* FB netdevice is special: we have one, and only one per netns.
1579 * Allowing to move it to another netns is clearly unsafe.
1580 */
1581 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1582
1583
1584 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1585 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1586
1587 err = register_netdev(ign->fb_tunnel_dev);
1588 if (err)
1589 goto err_reg_dev;
1590
1591 rcu_assign_pointer(ign->tunnels_wc[0],
1592 netdev_priv(ign->fb_tunnel_dev));
1593 return 0;
1594
1595 err_reg_dev:
1596 free_netdev(ign->fb_tunnel_dev);
1597 err_alloc_dev:
1598 return err;
1599 }
1600
1601 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1602 {
1603 struct net *net;
1604 LIST_HEAD(list);
1605
1606 rtnl_lock();
1607 list_for_each_entry(net, net_list, exit_list)
1608 ip6gre_destroy_tunnels(net, &list);
1609 unregister_netdevice_many(&list);
1610 rtnl_unlock();
1611 }
1612
1613 static struct pernet_operations ip6gre_net_ops = {
1614 .init = ip6gre_init_net,
1615 .exit_batch = ip6gre_exit_batch_net,
1616 .id = &ip6gre_net_id,
1617 .size = sizeof(struct ip6gre_net),
1618 };
1619
1620 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1621 struct netlink_ext_ack *extack)
1622 {
1623 __be16 flags;
1624
1625 if (!data)
1626 return 0;
1627
1628 flags = 0;
1629 if (data[IFLA_GRE_IFLAGS])
1630 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1631 if (data[IFLA_GRE_OFLAGS])
1632 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1633 if (flags & (GRE_VERSION|GRE_ROUTING))
1634 return -EINVAL;
1635
1636 return 0;
1637 }
1638
1639 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1640 struct netlink_ext_ack *extack)
1641 {
1642 struct in6_addr daddr;
1643
1644 if (tb[IFLA_ADDRESS]) {
1645 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1646 return -EINVAL;
1647 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1648 return -EADDRNOTAVAIL;
1649 }
1650
1651 if (!data)
1652 goto out;
1653
1654 if (data[IFLA_GRE_REMOTE]) {
1655 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1656 if (ipv6_addr_any(&daddr))
1657 return -EINVAL;
1658 }
1659
1660 out:
1661 return ip6gre_tunnel_validate(tb, data, extack);
1662 }
1663
1664 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1665 struct netlink_ext_ack *extack)
1666 {
1667 __be16 flags = 0;
1668 int ret, ver = 0;
1669
1670 if (!data)
1671 return 0;
1672
1673 ret = ip6gre_tap_validate(tb, data, extack);
1674 if (ret)
1675 return ret;
1676
1677 /* ERSPAN should only have GRE sequence and key flag */
1678 if (data[IFLA_GRE_OFLAGS])
1679 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1680 if (data[IFLA_GRE_IFLAGS])
1681 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1682 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1683 flags != (GRE_SEQ | GRE_KEY))
1684 return -EINVAL;
1685
1686 /* ERSPAN Session ID only has 10-bit. Since we reuse
1687 * 32-bit key field as ID, check it's range.
1688 */
1689 if (data[IFLA_GRE_IKEY] &&
1690 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1691 return -EINVAL;
1692
1693 if (data[IFLA_GRE_OKEY] &&
1694 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1695 return -EINVAL;
1696
1697 if (data[IFLA_GRE_ERSPAN_VER]) {
1698 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1699 if (ver != 1 && ver != 2)
1700 return -EINVAL;
1701 }
1702
1703 if (ver == 1) {
1704 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1705 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1706
1707 if (index & ~INDEX_MASK)
1708 return -EINVAL;
1709 }
1710 } else if (ver == 2) {
1711 if (data[IFLA_GRE_ERSPAN_DIR]) {
1712 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1713
1714 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1715 return -EINVAL;
1716 }
1717
1718 if (data[IFLA_GRE_ERSPAN_HWID]) {
1719 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1720
1721 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1722 return -EINVAL;
1723 }
1724 }
1725
1726 return 0;
1727 }
1728
1729 static void ip6gre_netlink_parms(struct nlattr *data[],
1730 struct __ip6_tnl_parm *parms)
1731 {
1732 memset(parms, 0, sizeof(*parms));
1733
1734 if (!data)
1735 return;
1736
1737 if (data[IFLA_GRE_LINK])
1738 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1739
1740 if (data[IFLA_GRE_IFLAGS])
1741 parms->i_flags = gre_flags_to_tnl_flags(
1742 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1743
1744 if (data[IFLA_GRE_OFLAGS])
1745 parms->o_flags = gre_flags_to_tnl_flags(
1746 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1747
1748 if (data[IFLA_GRE_IKEY])
1749 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1750
1751 if (data[IFLA_GRE_OKEY])
1752 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1753
1754 if (data[IFLA_GRE_LOCAL])
1755 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1756
1757 if (data[IFLA_GRE_REMOTE])
1758 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1759
1760 if (data[IFLA_GRE_TTL])
1761 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1762
1763 if (data[IFLA_GRE_ENCAP_LIMIT])
1764 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1765
1766 if (data[IFLA_GRE_FLOWINFO])
1767 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1768
1769 if (data[IFLA_GRE_FLAGS])
1770 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1771
1772 if (data[IFLA_GRE_FWMARK])
1773 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1774
1775 if (data[IFLA_GRE_COLLECT_METADATA])
1776 parms->collect_md = true;
1777
1778 if (data[IFLA_GRE_ERSPAN_VER])
1779 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1780
1781 if (parms->erspan_ver == 1) {
1782 if (data[IFLA_GRE_ERSPAN_INDEX])
1783 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1784 } else if (parms->erspan_ver == 2) {
1785 if (data[IFLA_GRE_ERSPAN_DIR])
1786 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1787 if (data[IFLA_GRE_ERSPAN_HWID])
1788 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1789 }
1790 }
1791
1792 static int ip6gre_tap_init(struct net_device *dev)
1793 {
1794 int ret;
1795
1796 ret = ip6gre_tunnel_init_common(dev);
1797 if (ret)
1798 return ret;
1799
1800 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1801
1802 return 0;
1803 }
1804
1805 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1806 .ndo_init = ip6gre_tap_init,
1807 .ndo_uninit = ip6gre_tunnel_uninit,
1808 .ndo_start_xmit = ip6gre_tunnel_xmit,
1809 .ndo_set_mac_address = eth_mac_addr,
1810 .ndo_validate_addr = eth_validate_addr,
1811 .ndo_change_mtu = ip6_tnl_change_mtu,
1812 .ndo_get_stats64 = ip_tunnel_get_stats64,
1813 .ndo_get_iflink = ip6_tnl_get_iflink,
1814 };
1815
1816 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1817 {
1818 int t_hlen;
1819
1820 tunnel->tun_hlen = 8;
1821 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1822 erspan_hdr_len(tunnel->parms.erspan_ver);
1823
1824 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1825 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1826 return t_hlen;
1827 }
1828
1829 static int ip6erspan_tap_init(struct net_device *dev)
1830 {
1831 struct ip6_tnl *tunnel;
1832 int t_hlen;
1833 int ret;
1834
1835 tunnel = netdev_priv(dev);
1836
1837 tunnel->dev = dev;
1838 tunnel->net = dev_net(dev);
1839 strcpy(tunnel->parms.name, dev->name);
1840
1841 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1842 if (!dev->tstats)
1843 return -ENOMEM;
1844
1845 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1846 if (ret)
1847 goto cleanup_alloc_pcpu_stats;
1848
1849 ret = gro_cells_init(&tunnel->gro_cells, dev);
1850 if (ret)
1851 goto cleanup_dst_cache_init;
1852
1853 t_hlen = ip6erspan_calc_hlen(tunnel);
1854 dev->mtu = ETH_DATA_LEN - t_hlen;
1855 if (dev->type == ARPHRD_ETHER)
1856 dev->mtu -= ETH_HLEN;
1857 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1858 dev->mtu -= 8;
1859
1860 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1861 ip6erspan_tnl_link_config(tunnel, 1);
1862
1863 return 0;
1864
1865 cleanup_dst_cache_init:
1866 dst_cache_destroy(&tunnel->dst_cache);
1867 cleanup_alloc_pcpu_stats:
1868 free_percpu(dev->tstats);
1869 dev->tstats = NULL;
1870 return ret;
1871 }
1872
1873 static const struct net_device_ops ip6erspan_netdev_ops = {
1874 .ndo_init = ip6erspan_tap_init,
1875 .ndo_uninit = ip6erspan_tunnel_uninit,
1876 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1877 .ndo_set_mac_address = eth_mac_addr,
1878 .ndo_validate_addr = eth_validate_addr,
1879 .ndo_change_mtu = ip6_tnl_change_mtu,
1880 .ndo_get_stats64 = ip_tunnel_get_stats64,
1881 .ndo_get_iflink = ip6_tnl_get_iflink,
1882 };
1883
1884 static void ip6gre_tap_setup(struct net_device *dev)
1885 {
1886
1887 ether_setup(dev);
1888
1889 dev->max_mtu = 0;
1890 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1891 dev->needs_free_netdev = true;
1892 dev->priv_destructor = ip6gre_dev_free;
1893
1894 dev->features |= NETIF_F_NETNS_LOCAL;
1895 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1896 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1897 netif_keep_dst(dev);
1898 }
1899
1900 bool is_ip6gretap_dev(const struct net_device *dev)
1901 {
1902 return dev->netdev_ops == &ip6gre_tap_netdev_ops;
1903 }
1904 EXPORT_SYMBOL_GPL(is_ip6gretap_dev);
1905
1906 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1907 struct ip_tunnel_encap *ipencap)
1908 {
1909 bool ret = false;
1910
1911 memset(ipencap, 0, sizeof(*ipencap));
1912
1913 if (!data)
1914 return ret;
1915
1916 if (data[IFLA_GRE_ENCAP_TYPE]) {
1917 ret = true;
1918 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1919 }
1920
1921 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1922 ret = true;
1923 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1924 }
1925
1926 if (data[IFLA_GRE_ENCAP_SPORT]) {
1927 ret = true;
1928 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1929 }
1930
1931 if (data[IFLA_GRE_ENCAP_DPORT]) {
1932 ret = true;
1933 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1934 }
1935
1936 return ret;
1937 }
1938
1939 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1940 struct nlattr *tb[], struct nlattr *data[],
1941 struct netlink_ext_ack *extack)
1942 {
1943 struct ip6_tnl *nt;
1944 struct ip_tunnel_encap ipencap;
1945 int err;
1946
1947 nt = netdev_priv(dev);
1948
1949 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1950 int err = ip6_tnl_encap_setup(nt, &ipencap);
1951
1952 if (err < 0)
1953 return err;
1954 }
1955
1956 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1957 eth_hw_addr_random(dev);
1958
1959 nt->dev = dev;
1960 nt->net = dev_net(dev);
1961
1962 err = register_netdevice(dev);
1963 if (err)
1964 goto out;
1965
1966 if (tb[IFLA_MTU])
1967 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1968
1969 dev_hold(dev);
1970
1971 out:
1972 return err;
1973 }
1974
1975 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1976 struct nlattr *tb[], struct nlattr *data[],
1977 struct netlink_ext_ack *extack)
1978 {
1979 struct ip6_tnl *nt = netdev_priv(dev);
1980 struct net *net = dev_net(dev);
1981 struct ip6gre_net *ign;
1982 int err;
1983
1984 ip6gre_netlink_parms(data, &nt->parms);
1985 ign = net_generic(net, ip6gre_net_id);
1986
1987 if (nt->parms.collect_md) {
1988 if (rtnl_dereference(ign->collect_md_tun))
1989 return -EEXIST;
1990 } else {
1991 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1992 return -EEXIST;
1993 }
1994
1995 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
1996 if (!err) {
1997 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1998 ip6gre_tunnel_link_md(ign, nt);
1999 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2000 }
2001 return err;
2002 }
2003
2004 static struct ip6_tnl *
2005 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2006 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2007 struct netlink_ext_ack *extack)
2008 {
2009 struct ip6_tnl *t, *nt = netdev_priv(dev);
2010 struct net *net = nt->net;
2011 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2012 struct ip_tunnel_encap ipencap;
2013
2014 if (dev == ign->fb_tunnel_dev)
2015 return ERR_PTR(-EINVAL);
2016
2017 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2018 int err = ip6_tnl_encap_setup(nt, &ipencap);
2019
2020 if (err < 0)
2021 return ERR_PTR(err);
2022 }
2023
2024 ip6gre_netlink_parms(data, p_p);
2025
2026 t = ip6gre_tunnel_locate(net, p_p, 0);
2027
2028 if (t) {
2029 if (t->dev != dev)
2030 return ERR_PTR(-EEXIST);
2031 } else {
2032 t = nt;
2033 }
2034
2035 return t;
2036 }
2037
2038 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2039 struct nlattr *data[],
2040 struct netlink_ext_ack *extack)
2041 {
2042 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2043 struct __ip6_tnl_parm p;
2044 struct ip6_tnl *t;
2045
2046 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2047 if (IS_ERR(t))
2048 return PTR_ERR(t);
2049
2050 ip6gre_tunnel_unlink_md(ign, t);
2051 ip6gre_tunnel_unlink(ign, t);
2052 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2053 ip6gre_tunnel_link_md(ign, t);
2054 ip6gre_tunnel_link(ign, t);
2055 return 0;
2056 }
2057
2058 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2059 {
2060 struct net *net = dev_net(dev);
2061 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2062
2063 if (dev != ign->fb_tunnel_dev)
2064 unregister_netdevice_queue(dev, head);
2065 }
2066
2067 static size_t ip6gre_get_size(const struct net_device *dev)
2068 {
2069 return
2070 /* IFLA_GRE_LINK */
2071 nla_total_size(4) +
2072 /* IFLA_GRE_IFLAGS */
2073 nla_total_size(2) +
2074 /* IFLA_GRE_OFLAGS */
2075 nla_total_size(2) +
2076 /* IFLA_GRE_IKEY */
2077 nla_total_size(4) +
2078 /* IFLA_GRE_OKEY */
2079 nla_total_size(4) +
2080 /* IFLA_GRE_LOCAL */
2081 nla_total_size(sizeof(struct in6_addr)) +
2082 /* IFLA_GRE_REMOTE */
2083 nla_total_size(sizeof(struct in6_addr)) +
2084 /* IFLA_GRE_TTL */
2085 nla_total_size(1) +
2086 /* IFLA_GRE_ENCAP_LIMIT */
2087 nla_total_size(1) +
2088 /* IFLA_GRE_FLOWINFO */
2089 nla_total_size(4) +
2090 /* IFLA_GRE_FLAGS */
2091 nla_total_size(4) +
2092 /* IFLA_GRE_ENCAP_TYPE */
2093 nla_total_size(2) +
2094 /* IFLA_GRE_ENCAP_FLAGS */
2095 nla_total_size(2) +
2096 /* IFLA_GRE_ENCAP_SPORT */
2097 nla_total_size(2) +
2098 /* IFLA_GRE_ENCAP_DPORT */
2099 nla_total_size(2) +
2100 /* IFLA_GRE_COLLECT_METADATA */
2101 nla_total_size(0) +
2102 /* IFLA_GRE_FWMARK */
2103 nla_total_size(4) +
2104 /* IFLA_GRE_ERSPAN_INDEX */
2105 nla_total_size(4) +
2106 0;
2107 }
2108
2109 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2110 {
2111 struct ip6_tnl *t = netdev_priv(dev);
2112 struct __ip6_tnl_parm *p = &t->parms;
2113
2114 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2115 nla_put_be16(skb, IFLA_GRE_IFLAGS,
2116 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2117 nla_put_be16(skb, IFLA_GRE_OFLAGS,
2118 gre_tnl_flags_to_gre_flags(p->o_flags)) ||
2119 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2120 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2121 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2122 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2123 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2124 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2125 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2126 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2127 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark) ||
2128 nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2129 goto nla_put_failure;
2130
2131 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2132 t->encap.type) ||
2133 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2134 t->encap.sport) ||
2135 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2136 t->encap.dport) ||
2137 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2138 t->encap.flags))
2139 goto nla_put_failure;
2140
2141 if (p->collect_md) {
2142 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2143 goto nla_put_failure;
2144 }
2145
2146 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2147 goto nla_put_failure;
2148
2149 if (p->erspan_ver == 1) {
2150 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2151 goto nla_put_failure;
2152 } else if (p->erspan_ver == 2) {
2153 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2154 goto nla_put_failure;
2155 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2156 goto nla_put_failure;
2157 }
2158
2159 return 0;
2160
2161 nla_put_failure:
2162 return -EMSGSIZE;
2163 }
2164
2165 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2166 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2167 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2168 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2169 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2170 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2171 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
2172 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
2173 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2174 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2175 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2176 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
2177 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2178 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2179 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2180 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
2181 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2182 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
2183 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2184 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2185 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2186 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
2187 };
2188
2189 static void ip6erspan_tap_setup(struct net_device *dev)
2190 {
2191 ether_setup(dev);
2192
2193 dev->netdev_ops = &ip6erspan_netdev_ops;
2194 dev->needs_free_netdev = true;
2195 dev->priv_destructor = ip6gre_dev_free;
2196
2197 dev->features |= NETIF_F_NETNS_LOCAL;
2198 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2199 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2200 netif_keep_dst(dev);
2201 }
2202
2203 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2204 struct nlattr *tb[], struct nlattr *data[],
2205 struct netlink_ext_ack *extack)
2206 {
2207 struct ip6_tnl *nt = netdev_priv(dev);
2208 struct net *net = dev_net(dev);
2209 struct ip6gre_net *ign;
2210 int err;
2211
2212 ip6gre_netlink_parms(data, &nt->parms);
2213 ign = net_generic(net, ip6gre_net_id);
2214
2215 if (nt->parms.collect_md) {
2216 if (rtnl_dereference(ign->collect_md_tun_erspan))
2217 return -EEXIST;
2218 } else {
2219 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2220 return -EEXIST;
2221 }
2222
2223 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2224 if (!err) {
2225 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2226 ip6erspan_tunnel_link_md(ign, nt);
2227 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2228 }
2229 return err;
2230 }
2231
2232 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2233 {
2234 ip6gre_tnl_link_config_common(t);
2235 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2236 }
2237
2238 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2239 const struct __ip6_tnl_parm *p, int set_mtu)
2240 {
2241 ip6gre_tnl_copy_tnl_parm(t, p);
2242 ip6erspan_tnl_link_config(t, set_mtu);
2243 return 0;
2244 }
2245
2246 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2247 struct nlattr *data[],
2248 struct netlink_ext_ack *extack)
2249 {
2250 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2251 struct __ip6_tnl_parm p;
2252 struct ip6_tnl *t;
2253
2254 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2255 if (IS_ERR(t))
2256 return PTR_ERR(t);
2257
2258 ip6gre_tunnel_unlink_md(ign, t);
2259 ip6gre_tunnel_unlink(ign, t);
2260 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2261 ip6erspan_tunnel_link_md(ign, t);
2262 ip6gre_tunnel_link(ign, t);
2263 return 0;
2264 }
2265
2266 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2267 .kind = "ip6gre",
2268 .maxtype = IFLA_GRE_MAX,
2269 .policy = ip6gre_policy,
2270 .priv_size = sizeof(struct ip6_tnl),
2271 .setup = ip6gre_tunnel_setup,
2272 .validate = ip6gre_tunnel_validate,
2273 .newlink = ip6gre_newlink,
2274 .changelink = ip6gre_changelink,
2275 .dellink = ip6gre_dellink,
2276 .get_size = ip6gre_get_size,
2277 .fill_info = ip6gre_fill_info,
2278 .get_link_net = ip6_tnl_get_link_net,
2279 };
2280
2281 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2282 .kind = "ip6gretap",
2283 .maxtype = IFLA_GRE_MAX,
2284 .policy = ip6gre_policy,
2285 .priv_size = sizeof(struct ip6_tnl),
2286 .setup = ip6gre_tap_setup,
2287 .validate = ip6gre_tap_validate,
2288 .newlink = ip6gre_newlink,
2289 .changelink = ip6gre_changelink,
2290 .get_size = ip6gre_get_size,
2291 .fill_info = ip6gre_fill_info,
2292 .get_link_net = ip6_tnl_get_link_net,
2293 };
2294
2295 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2296 .kind = "ip6erspan",
2297 .maxtype = IFLA_GRE_MAX,
2298 .policy = ip6gre_policy,
2299 .priv_size = sizeof(struct ip6_tnl),
2300 .setup = ip6erspan_tap_setup,
2301 .validate = ip6erspan_tap_validate,
2302 .newlink = ip6erspan_newlink,
2303 .changelink = ip6erspan_changelink,
2304 .get_size = ip6gre_get_size,
2305 .fill_info = ip6gre_fill_info,
2306 .get_link_net = ip6_tnl_get_link_net,
2307 };
2308
2309 /*
2310 * And now the modules code and kernel interface.
2311 */
2312
2313 static int __init ip6gre_init(void)
2314 {
2315 int err;
2316
2317 pr_info("GRE over IPv6 tunneling driver\n");
2318
2319 err = register_pernet_device(&ip6gre_net_ops);
2320 if (err < 0)
2321 return err;
2322
2323 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2324 if (err < 0) {
2325 pr_info("%s: can't add protocol\n", __func__);
2326 goto add_proto_failed;
2327 }
2328
2329 err = rtnl_link_register(&ip6gre_link_ops);
2330 if (err < 0)
2331 goto rtnl_link_failed;
2332
2333 err = rtnl_link_register(&ip6gre_tap_ops);
2334 if (err < 0)
2335 goto tap_ops_failed;
2336
2337 err = rtnl_link_register(&ip6erspan_tap_ops);
2338 if (err < 0)
2339 goto erspan_link_failed;
2340
2341 out:
2342 return err;
2343
2344 erspan_link_failed:
2345 rtnl_link_unregister(&ip6gre_tap_ops);
2346 tap_ops_failed:
2347 rtnl_link_unregister(&ip6gre_link_ops);
2348 rtnl_link_failed:
2349 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2350 add_proto_failed:
2351 unregister_pernet_device(&ip6gre_net_ops);
2352 goto out;
2353 }
2354
2355 static void __exit ip6gre_fini(void)
2356 {
2357 rtnl_link_unregister(&ip6gre_tap_ops);
2358 rtnl_link_unregister(&ip6gre_link_ops);
2359 rtnl_link_unregister(&ip6erspan_tap_ops);
2360 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2361 unregister_pernet_device(&ip6gre_net_ops);
2362 }
2363
2364 module_init(ip6gre_init);
2365 module_exit(ip6gre_fini);
2366 MODULE_LICENSE("GPL");
2367 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2368 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2369 MODULE_ALIAS_RTNL_LINK("ip6gre");
2370 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2371 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2372 MODULE_ALIAS_NETDEV("ip6gre0");
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