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mm: introduce vmf_insert_pfn_prot()
[linux/fpc-iii.git] / net / ipv6 / ip6_gre.c
blob515adbdba1d278bf7773b78d42957679418ec0d7
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 ipv6hdr *ipv6h;
431 struct tnl_ptk_info tpi;
432 struct ip6_tnl *t;
433
434 if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6),
435 offset) < 0)
436 return;
437
438 ipv6h = (const struct ipv6hdr *)skb->data;
439 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
440 tpi.key, tpi.proto);
441 if (!t)
442 return;
443
444 switch (type) {
445 struct ipv6_tlv_tnl_enc_lim *tel;
446 __u32 teli;
447 case ICMPV6_DEST_UNREACH:
448 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
449 t->parms.name);
450 if (code != ICMPV6_PORT_UNREACH)
451 break;
452 return;
453 case ICMPV6_TIME_EXCEED:
454 if (code == ICMPV6_EXC_HOPLIMIT) {
455 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
456 t->parms.name);
457 break;
458 }
459 return;
460 case ICMPV6_PARAMPROB:
461 teli = 0;
462 if (code == ICMPV6_HDR_FIELD)
463 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
464
465 if (teli && teli == be32_to_cpu(info) - 2) {
466 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
467 if (tel->encap_limit == 0) {
468 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
469 t->parms.name);
470 }
471 } else {
472 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
473 t->parms.name);
474 }
475 return;
476 case ICMPV6_PKT_TOOBIG:
477 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
478 return;
479 case NDISC_REDIRECT:
480 ip6_redirect(skb, net, skb->dev->ifindex, 0,
481 sock_net_uid(net, NULL));
482 return;
483 }
484
485 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
486 t->err_count++;
487 else
488 t->err_count = 1;
489 t->err_time = jiffies;
490 }
491
492 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
493 {
494 const struct ipv6hdr *ipv6h;
495 struct ip6_tnl *tunnel;
496
497 ipv6h = ipv6_hdr(skb);
498 tunnel = ip6gre_tunnel_lookup(skb->dev,
499 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
500 tpi->proto);
501 if (tunnel) {
502 if (tunnel->parms.collect_md) {
503 struct metadata_dst *tun_dst;
504 __be64 tun_id;
505 __be16 flags;
506
507 flags = tpi->flags;
508 tun_id = key32_to_tunnel_id(tpi->key);
509
510 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
511 if (!tun_dst)
512 return PACKET_REJECT;
513
514 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
515 } else {
516 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
517 }
518
519 return PACKET_RCVD;
520 }
521
522 return PACKET_REJECT;
523 }
524
525 static int ip6erspan_rcv(struct sk_buff *skb, int gre_hdr_len,
526 struct tnl_ptk_info *tpi)
527 {
528 struct erspan_base_hdr *ershdr;
529 struct erspan_metadata *pkt_md;
530 const struct ipv6hdr *ipv6h;
531 struct erspan_md2 *md2;
532 struct ip6_tnl *tunnel;
533 u8 ver;
534
535 if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr))))
536 return PACKET_REJECT;
537
538 ipv6h = ipv6_hdr(skb);
539 ershdr = (struct erspan_base_hdr *)skb->data;
540 ver = ershdr->ver;
541 tpi->key = cpu_to_be32(get_session_id(ershdr));
542
543 tunnel = ip6gre_tunnel_lookup(skb->dev,
544 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
545 tpi->proto);
546 if (tunnel) {
547 int len = erspan_hdr_len(ver);
548
549 if (unlikely(!pskb_may_pull(skb, len)))
550 return PACKET_REJECT;
551
552 ershdr = (struct erspan_base_hdr *)skb->data;
553 pkt_md = (struct erspan_metadata *)(ershdr + 1);
554
555 if (__iptunnel_pull_header(skb, len,
556 htons(ETH_P_TEB),
557 false, false) < 0)
558 return PACKET_REJECT;
559
560 if (tunnel->parms.collect_md) {
561 struct metadata_dst *tun_dst;
562 struct ip_tunnel_info *info;
563 struct erspan_metadata *md;
564 __be64 tun_id;
565 __be16 flags;
566
567 tpi->flags |= TUNNEL_KEY;
568 flags = tpi->flags;
569 tun_id = key32_to_tunnel_id(tpi->key);
570
571 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
572 sizeof(*md));
573 if (!tun_dst)
574 return PACKET_REJECT;
575
576 info = &tun_dst->u.tun_info;
577 md = ip_tunnel_info_opts(info);
578 md->version = ver;
579 md2 = &md->u.md2;
580 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
581 ERSPAN_V2_MDSIZE);
582 info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
583 info->options_len = sizeof(*md);
584
585 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
586
587 } else {
588 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
589 }
590
591 return PACKET_RCVD;
592 }
593
594 return PACKET_REJECT;
595 }
596
597 static int gre_rcv(struct sk_buff *skb)
598 {
599 struct tnl_ptk_info tpi;
600 bool csum_err = false;
601 int hdr_len;
602
603 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
604 if (hdr_len < 0)
605 goto drop;
606
607 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
608 goto drop;
609
610 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
611 tpi.proto == htons(ETH_P_ERSPAN2))) {
612 if (ip6erspan_rcv(skb, hdr_len, &tpi) == PACKET_RCVD)
613 return 0;
614 goto out;
615 }
616
617 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
618 return 0;
619
620 out:
621 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
622 drop:
623 kfree_skb(skb);
624 return 0;
625 }
626
627 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
628 {
629 return iptunnel_handle_offloads(skb,
630 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
631 }
632
633 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
634 struct net_device *dev,
635 struct flowi6 *fl6, __u8 *dsfield,
636 int *encap_limit)
637 {
638 const struct iphdr *iph = ip_hdr(skb);
639 struct ip6_tnl *t = netdev_priv(dev);
640
641 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
642 *encap_limit = t->parms.encap_limit;
643
644 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
645
646 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
647 *dsfield = ipv4_get_dsfield(iph);
648 else
649 *dsfield = ip6_tclass(t->parms.flowinfo);
650
651 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
652 fl6->flowi6_mark = skb->mark;
653 else
654 fl6->flowi6_mark = t->parms.fwmark;
655
656 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
657 }
658
659 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
660 struct net_device *dev,
661 struct flowi6 *fl6, __u8 *dsfield,
662 int *encap_limit)
663 {
664 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
665 struct ip6_tnl *t = netdev_priv(dev);
666 __u16 offset;
667
668 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
669 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
670
671 if (offset > 0) {
672 struct ipv6_tlv_tnl_enc_lim *tel;
673
674 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
675 if (tel->encap_limit == 0) {
676 icmpv6_send(skb, ICMPV6_PARAMPROB,
677 ICMPV6_HDR_FIELD, offset + 2);
678 return -1;
679 }
680 *encap_limit = tel->encap_limit - 1;
681 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
682 *encap_limit = t->parms.encap_limit;
683 }
684
685 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
686
687 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
688 *dsfield = ipv6_get_dsfield(ipv6h);
689 else
690 *dsfield = ip6_tclass(t->parms.flowinfo);
691
692 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
693 fl6->flowlabel |= ip6_flowlabel(ipv6h);
694
695 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
696 fl6->flowi6_mark = skb->mark;
697 else
698 fl6->flowi6_mark = t->parms.fwmark;
699
700 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
701
702 return 0;
703 }
704
705 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
706 struct net_device *dev, __u8 dsfield,
707 struct flowi6 *fl6, int encap_limit,
708 __u32 *pmtu, __be16 proto)
709 {
710 struct ip6_tnl *tunnel = netdev_priv(dev);
711 __be16 protocol;
712
713 if (dev->type == ARPHRD_ETHER)
714 IPCB(skb)->flags = 0;
715
716 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
717 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
718 else
719 fl6->daddr = tunnel->parms.raddr;
720
721 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
722 return -ENOMEM;
723
724 /* Push GRE header. */
725 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
726
727 if (tunnel->parms.collect_md) {
728 struct ip_tunnel_info *tun_info;
729 const struct ip_tunnel_key *key;
730 __be16 flags;
731
732 tun_info = skb_tunnel_info(skb);
733 if (unlikely(!tun_info ||
734 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
735 ip_tunnel_info_af(tun_info) != AF_INET6))
736 return -EINVAL;
737
738 key = &tun_info->key;
739 memset(fl6, 0, sizeof(*fl6));
740 fl6->flowi6_proto = IPPROTO_GRE;
741 fl6->daddr = key->u.ipv6.dst;
742 fl6->flowlabel = key->label;
743 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
744
745 dsfield = key->tos;
746 flags = key->tun_flags &
747 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
748 tunnel->tun_hlen = gre_calc_hlen(flags);
749
750 gre_build_header(skb, tunnel->tun_hlen,
751 flags, protocol,
752 tunnel_id_to_key32(tun_info->key.tun_id),
753 (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++)
754 : 0);
755
756 } else {
757 if (tunnel->parms.o_flags & TUNNEL_SEQ)
758 tunnel->o_seqno++;
759
760 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
761 protocol, tunnel->parms.o_key,
762 htonl(tunnel->o_seqno));
763 }
764
765 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
766 NEXTHDR_GRE);
767 }
768
769 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
770 {
771 struct ip6_tnl *t = netdev_priv(dev);
772 int encap_limit = -1;
773 struct flowi6 fl6;
774 __u8 dsfield = 0;
775 __u32 mtu;
776 int err;
777
778 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
779
780 if (!t->parms.collect_md)
781 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
782 &dsfield, &encap_limit);
783
784 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
785 if (err)
786 return -1;
787
788 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
789 skb->protocol);
790 if (err != 0) {
791 /* XXX: send ICMP error even if DF is not set. */
792 if (err == -EMSGSIZE)
793 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
794 htonl(mtu));
795 return -1;
796 }
797
798 return 0;
799 }
800
801 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
802 {
803 struct ip6_tnl *t = netdev_priv(dev);
804 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
805 int encap_limit = -1;
806 struct flowi6 fl6;
807 __u8 dsfield = 0;
808 __u32 mtu;
809 int err;
810
811 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
812 return -1;
813
814 if (!t->parms.collect_md &&
815 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
816 return -1;
817
818 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
819 return -1;
820
821 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
822 &mtu, skb->protocol);
823 if (err != 0) {
824 if (err == -EMSGSIZE)
825 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
826 return -1;
827 }
828
829 return 0;
830 }
831
832 /**
833 * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own
834 * @t: the outgoing tunnel device
835 * @hdr: IPv6 header from the incoming packet
836 *
837 * Description:
838 * Avoid trivial tunneling loop by checking that tunnel exit-point
839 * doesn't match source of incoming packet.
840 *
841 * Return:
842 * 1 if conflict,
843 * 0 else
844 **/
845
846 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
847 const struct ipv6hdr *hdr)
848 {
849 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
850 }
851
852 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
853 {
854 struct ip6_tnl *t = netdev_priv(dev);
855 int encap_limit = -1;
856 struct flowi6 fl6;
857 __u32 mtu;
858 int err;
859
860 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
861 encap_limit = t->parms.encap_limit;
862
863 if (!t->parms.collect_md)
864 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
865
866 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
867 if (err)
868 return err;
869
870 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
871
872 return err;
873 }
874
875 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
876 struct net_device *dev)
877 {
878 struct ip6_tnl *t = netdev_priv(dev);
879 struct net_device_stats *stats = &t->dev->stats;
880 int ret;
881
882 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
883 goto tx_err;
884
885 switch (skb->protocol) {
886 case htons(ETH_P_IP):
887 ret = ip6gre_xmit_ipv4(skb, dev);
888 break;
889 case htons(ETH_P_IPV6):
890 ret = ip6gre_xmit_ipv6(skb, dev);
891 break;
892 default:
893 ret = ip6gre_xmit_other(skb, dev);
894 break;
895 }
896
897 if (ret < 0)
898 goto tx_err;
899
900 return NETDEV_TX_OK;
901
902 tx_err:
903 stats->tx_errors++;
904 stats->tx_dropped++;
905 kfree_skb(skb);
906 return NETDEV_TX_OK;
907 }
908
909 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
910 struct net_device *dev)
911 {
912 struct ip6_tnl *t = netdev_priv(dev);
913 struct dst_entry *dst = skb_dst(skb);
914 struct net_device_stats *stats;
915 bool truncate = false;
916 int encap_limit = -1;
917 __u8 dsfield = false;
918 struct flowi6 fl6;
919 int err = -EINVAL;
920 __u32 mtu;
921 int nhoff;
922 int thoff;
923
924 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
925 goto tx_err;
926
927 if (gre_handle_offloads(skb, false))
928 goto tx_err;
929
930 if (skb->len > dev->mtu + dev->hard_header_len) {
931 pskb_trim(skb, dev->mtu + dev->hard_header_len);
932 truncate = true;
933 }
934
935 nhoff = skb_network_header(skb) - skb_mac_header(skb);
936 if (skb->protocol == htons(ETH_P_IP) &&
937 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
938 truncate = true;
939
940 thoff = skb_transport_header(skb) - skb_mac_header(skb);
941 if (skb->protocol == htons(ETH_P_IPV6) &&
942 (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff))
943 truncate = true;
944
945 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
946 goto tx_err;
947
948 t->parms.o_flags &= ~TUNNEL_KEY;
949 IPCB(skb)->flags = 0;
950
951 /* For collect_md mode, derive fl6 from the tunnel key,
952 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
953 */
954 if (t->parms.collect_md) {
955 struct ip_tunnel_info *tun_info;
956 const struct ip_tunnel_key *key;
957 struct erspan_metadata *md;
958 __be32 tun_id;
959
960 tun_info = skb_tunnel_info(skb);
961 if (unlikely(!tun_info ||
962 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
963 ip_tunnel_info_af(tun_info) != AF_INET6))
964 return -EINVAL;
965
966 key = &tun_info->key;
967 memset(&fl6, 0, sizeof(fl6));
968 fl6.flowi6_proto = IPPROTO_GRE;
969 fl6.daddr = key->u.ipv6.dst;
970 fl6.flowlabel = key->label;
971 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
972
973 dsfield = key->tos;
974 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
975 goto tx_err;
976 md = ip_tunnel_info_opts(tun_info);
977 if (!md)
978 goto tx_err;
979
980 tun_id = tunnel_id_to_key32(key->tun_id);
981 if (md->version == 1) {
982 erspan_build_header(skb,
983 ntohl(tun_id),
984 ntohl(md->u.index), truncate,
985 false);
986 } else if (md->version == 2) {
987 erspan_build_header_v2(skb,
988 ntohl(tun_id),
989 md->u.md2.dir,
990 get_hwid(&md->u.md2),
991 truncate, false);
992 } else {
993 goto tx_err;
994 }
995 } else {
996 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
997
998 switch (skb->protocol) {
999 case htons(ETH_P_IP):
1000 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1001 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1002 &dsfield, &encap_limit);
1003 break;
1004 case htons(ETH_P_IPV6):
1005 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
1006 goto tx_err;
1007 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1008 &dsfield, &encap_limit))
1009 goto tx_err;
1010 break;
1011 default:
1012 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1013 break;
1014 }
1015
1016 if (t->parms.erspan_ver == 1)
1017 erspan_build_header(skb, ntohl(t->parms.o_key),
1018 t->parms.index,
1019 truncate, false);
1020 else if (t->parms.erspan_ver == 2)
1021 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1022 t->parms.dir,
1023 t->parms.hwid,
1024 truncate, false);
1025 else
1026 goto tx_err;
1027
1028 fl6.daddr = t->parms.raddr;
1029 }
1030
1031 /* Push GRE header. */
1032 gre_build_header(skb, 8, TUNNEL_SEQ,
1033 htons(ETH_P_ERSPAN), 0, htonl(t->o_seqno++));
1034
1035 /* TooBig packet may have updated dst->dev's mtu */
1036 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1037 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu);
1038
1039 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1040 NEXTHDR_GRE);
1041 if (err != 0) {
1042 /* XXX: send ICMP error even if DF is not set. */
1043 if (err == -EMSGSIZE) {
1044 if (skb->protocol == htons(ETH_P_IP))
1045 icmp_send(skb, ICMP_DEST_UNREACH,
1046 ICMP_FRAG_NEEDED, htonl(mtu));
1047 else
1048 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1049 }
1050
1051 goto tx_err;
1052 }
1053 return NETDEV_TX_OK;
1054
1055 tx_err:
1056 stats = &t->dev->stats;
1057 stats->tx_errors++;
1058 stats->tx_dropped++;
1059 kfree_skb(skb);
1060 return NETDEV_TX_OK;
1061 }
1062
1063 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1064 {
1065 struct net_device *dev = t->dev;
1066 struct __ip6_tnl_parm *p = &t->parms;
1067 struct flowi6 *fl6 = &t->fl.u.ip6;
1068
1069 if (dev->type != ARPHRD_ETHER) {
1070 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1071 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1072 }
1073
1074 /* Set up flowi template */
1075 fl6->saddr = p->laddr;
1076 fl6->daddr = p->raddr;
1077 fl6->flowi6_oif = p->link;
1078 fl6->flowlabel = 0;
1079 fl6->flowi6_proto = IPPROTO_GRE;
1080
1081 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1082 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1083 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1084 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1085
1086 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1087 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1088
1089 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1090 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1091 dev->flags |= IFF_POINTOPOINT;
1092 else
1093 dev->flags &= ~IFF_POINTOPOINT;
1094 }
1095
1096 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1097 int t_hlen)
1098 {
1099 const struct __ip6_tnl_parm *p = &t->parms;
1100 struct net_device *dev = t->dev;
1101
1102 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1103 int strict = (ipv6_addr_type(&p->raddr) &
1104 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1105
1106 struct rt6_info *rt = rt6_lookup(t->net,
1107 &p->raddr, &p->laddr,
1108 p->link, NULL, strict);
1109
1110 if (!rt)
1111 return;
1112
1113 if (rt->dst.dev) {
1114 dev->needed_headroom = rt->dst.dev->hard_header_len +
1115 t_hlen;
1116
1117 if (set_mtu) {
1118 dev->mtu = rt->dst.dev->mtu - t_hlen;
1119 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1120 dev->mtu -= 8;
1121 if (dev->type == ARPHRD_ETHER)
1122 dev->mtu -= ETH_HLEN;
1123
1124 if (dev->mtu < IPV6_MIN_MTU)
1125 dev->mtu = IPV6_MIN_MTU;
1126 }
1127 }
1128 ip6_rt_put(rt);
1129 }
1130 }
1131
1132 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1133 {
1134 int t_hlen;
1135
1136 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1137 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1138
1139 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1140 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1141 return t_hlen;
1142 }
1143
1144 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1145 {
1146 ip6gre_tnl_link_config_common(t);
1147 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1148 }
1149
1150 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1151 const struct __ip6_tnl_parm *p)
1152 {
1153 t->parms.laddr = p->laddr;
1154 t->parms.raddr = p->raddr;
1155 t->parms.flags = p->flags;
1156 t->parms.hop_limit = p->hop_limit;
1157 t->parms.encap_limit = p->encap_limit;
1158 t->parms.flowinfo = p->flowinfo;
1159 t->parms.link = p->link;
1160 t->parms.proto = p->proto;
1161 t->parms.i_key = p->i_key;
1162 t->parms.o_key = p->o_key;
1163 t->parms.i_flags = p->i_flags;
1164 t->parms.o_flags = p->o_flags;
1165 t->parms.fwmark = p->fwmark;
1166 dst_cache_reset(&t->dst_cache);
1167 }
1168
1169 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1170 int set_mtu)
1171 {
1172 ip6gre_tnl_copy_tnl_parm(t, p);
1173 ip6gre_tnl_link_config(t, set_mtu);
1174 return 0;
1175 }
1176
1177 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1178 const struct ip6_tnl_parm2 *u)
1179 {
1180 p->laddr = u->laddr;
1181 p->raddr = u->raddr;
1182 p->flags = u->flags;
1183 p->hop_limit = u->hop_limit;
1184 p->encap_limit = u->encap_limit;
1185 p->flowinfo = u->flowinfo;
1186 p->link = u->link;
1187 p->i_key = u->i_key;
1188 p->o_key = u->o_key;
1189 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1190 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1191 memcpy(p->name, u->name, sizeof(u->name));
1192 }
1193
1194 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1195 const struct __ip6_tnl_parm *p)
1196 {
1197 u->proto = IPPROTO_GRE;
1198 u->laddr = p->laddr;
1199 u->raddr = p->raddr;
1200 u->flags = p->flags;
1201 u->hop_limit = p->hop_limit;
1202 u->encap_limit = p->encap_limit;
1203 u->flowinfo = p->flowinfo;
1204 u->link = p->link;
1205 u->i_key = p->i_key;
1206 u->o_key = p->o_key;
1207 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1208 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1209 memcpy(u->name, p->name, sizeof(u->name));
1210 }
1211
1212 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1213 struct ifreq *ifr, int cmd)
1214 {
1215 int err = 0;
1216 struct ip6_tnl_parm2 p;
1217 struct __ip6_tnl_parm p1;
1218 struct ip6_tnl *t = netdev_priv(dev);
1219 struct net *net = t->net;
1220 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1221
1222 memset(&p1, 0, sizeof(p1));
1223
1224 switch (cmd) {
1225 case SIOCGETTUNNEL:
1226 if (dev == ign->fb_tunnel_dev) {
1227 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1228 err = -EFAULT;
1229 break;
1230 }
1231 ip6gre_tnl_parm_from_user(&p1, &p);
1232 t = ip6gre_tunnel_locate(net, &p1, 0);
1233 if (!t)
1234 t = netdev_priv(dev);
1235 }
1236 memset(&p, 0, sizeof(p));
1237 ip6gre_tnl_parm_to_user(&p, &t->parms);
1238 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1239 err = -EFAULT;
1240 break;
1241
1242 case SIOCADDTUNNEL:
1243 case SIOCCHGTUNNEL:
1244 err = -EPERM;
1245 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1246 goto done;
1247
1248 err = -EFAULT;
1249 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1250 goto done;
1251
1252 err = -EINVAL;
1253 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1254 goto done;
1255
1256 if (!(p.i_flags&GRE_KEY))
1257 p.i_key = 0;
1258 if (!(p.o_flags&GRE_KEY))
1259 p.o_key = 0;
1260
1261 ip6gre_tnl_parm_from_user(&p1, &p);
1262 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1263
1264 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1265 if (t) {
1266 if (t->dev != dev) {
1267 err = -EEXIST;
1268 break;
1269 }
1270 } else {
1271 t = netdev_priv(dev);
1272
1273 ip6gre_tunnel_unlink(ign, t);
1274 synchronize_net();
1275 ip6gre_tnl_change(t, &p1, 1);
1276 ip6gre_tunnel_link(ign, t);
1277 netdev_state_change(dev);
1278 }
1279 }
1280
1281 if (t) {
1282 err = 0;
1283
1284 memset(&p, 0, sizeof(p));
1285 ip6gre_tnl_parm_to_user(&p, &t->parms);
1286 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1287 err = -EFAULT;
1288 } else
1289 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1290 break;
1291
1292 case SIOCDELTUNNEL:
1293 err = -EPERM;
1294 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1295 goto done;
1296
1297 if (dev == ign->fb_tunnel_dev) {
1298 err = -EFAULT;
1299 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1300 goto done;
1301 err = -ENOENT;
1302 ip6gre_tnl_parm_from_user(&p1, &p);
1303 t = ip6gre_tunnel_locate(net, &p1, 0);
1304 if (!t)
1305 goto done;
1306 err = -EPERM;
1307 if (t == netdev_priv(ign->fb_tunnel_dev))
1308 goto done;
1309 dev = t->dev;
1310 }
1311 unregister_netdevice(dev);
1312 err = 0;
1313 break;
1314
1315 default:
1316 err = -EINVAL;
1317 }
1318
1319 done:
1320 return err;
1321 }
1322
1323 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1324 unsigned short type, const void *daddr,
1325 const void *saddr, unsigned int len)
1326 {
1327 struct ip6_tnl *t = netdev_priv(dev);
1328 struct ipv6hdr *ipv6h;
1329 __be16 *p;
1330
1331 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1332 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1333 t->fl.u.ip6.flowlabel,
1334 true, &t->fl.u.ip6));
1335 ipv6h->hop_limit = t->parms.hop_limit;
1336 ipv6h->nexthdr = NEXTHDR_GRE;
1337 ipv6h->saddr = t->parms.laddr;
1338 ipv6h->daddr = t->parms.raddr;
1339
1340 p = (__be16 *)(ipv6h + 1);
1341 p[0] = t->parms.o_flags;
1342 p[1] = htons(type);
1343
1344 /*
1345 * Set the source hardware address.
1346 */
1347
1348 if (saddr)
1349 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1350 if (daddr)
1351 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1352 if (!ipv6_addr_any(&ipv6h->daddr))
1353 return t->hlen;
1354
1355 return -t->hlen;
1356 }
1357
1358 static const struct header_ops ip6gre_header_ops = {
1359 .create = ip6gre_header,
1360 };
1361
1362 static const struct net_device_ops ip6gre_netdev_ops = {
1363 .ndo_init = ip6gre_tunnel_init,
1364 .ndo_uninit = ip6gre_tunnel_uninit,
1365 .ndo_start_xmit = ip6gre_tunnel_xmit,
1366 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1367 .ndo_change_mtu = ip6_tnl_change_mtu,
1368 .ndo_get_stats64 = ip_tunnel_get_stats64,
1369 .ndo_get_iflink = ip6_tnl_get_iflink,
1370 };
1371
1372 static void ip6gre_dev_free(struct net_device *dev)
1373 {
1374 struct ip6_tnl *t = netdev_priv(dev);
1375
1376 gro_cells_destroy(&t->gro_cells);
1377 dst_cache_destroy(&t->dst_cache);
1378 free_percpu(dev->tstats);
1379 }
1380
1381 static void ip6gre_tunnel_setup(struct net_device *dev)
1382 {
1383 dev->netdev_ops = &ip6gre_netdev_ops;
1384 dev->needs_free_netdev = true;
1385 dev->priv_destructor = ip6gre_dev_free;
1386
1387 dev->type = ARPHRD_IP6GRE;
1388
1389 dev->flags |= IFF_NOARP;
1390 dev->addr_len = sizeof(struct in6_addr);
1391 netif_keep_dst(dev);
1392 /* This perm addr will be used as interface identifier by IPv6 */
1393 dev->addr_assign_type = NET_ADDR_RANDOM;
1394 eth_random_addr(dev->perm_addr);
1395 }
1396
1397 #define GRE6_FEATURES (NETIF_F_SG | \
1398 NETIF_F_FRAGLIST | \
1399 NETIF_F_HIGHDMA | \
1400 NETIF_F_HW_CSUM)
1401
1402 static void ip6gre_tnl_init_features(struct net_device *dev)
1403 {
1404 struct ip6_tnl *nt = netdev_priv(dev);
1405
1406 dev->features |= GRE6_FEATURES;
1407 dev->hw_features |= GRE6_FEATURES;
1408
1409 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1410 /* TCP offload with GRE SEQ is not supported, nor
1411 * can we support 2 levels of outer headers requiring
1412 * an update.
1413 */
1414 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1415 nt->encap.type == TUNNEL_ENCAP_NONE) {
1416 dev->features |= NETIF_F_GSO_SOFTWARE;
1417 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1418 }
1419
1420 /* Can use a lockless transmit, unless we generate
1421 * output sequences
1422 */
1423 dev->features |= NETIF_F_LLTX;
1424 }
1425 }
1426
1427 static int ip6gre_tunnel_init_common(struct net_device *dev)
1428 {
1429 struct ip6_tnl *tunnel;
1430 int ret;
1431 int t_hlen;
1432
1433 tunnel = netdev_priv(dev);
1434
1435 tunnel->dev = dev;
1436 tunnel->net = dev_net(dev);
1437 strcpy(tunnel->parms.name, dev->name);
1438
1439 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1440 if (!dev->tstats)
1441 return -ENOMEM;
1442
1443 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1444 if (ret)
1445 goto cleanup_alloc_pcpu_stats;
1446
1447 ret = gro_cells_init(&tunnel->gro_cells, dev);
1448 if (ret)
1449 goto cleanup_dst_cache_init;
1450
1451 t_hlen = ip6gre_calc_hlen(tunnel);
1452 dev->mtu = ETH_DATA_LEN - t_hlen;
1453 if (dev->type == ARPHRD_ETHER)
1454 dev->mtu -= ETH_HLEN;
1455 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1456 dev->mtu -= 8;
1457
1458 if (tunnel->parms.collect_md) {
1459 dev->features |= NETIF_F_NETNS_LOCAL;
1460 netif_keep_dst(dev);
1461 }
1462 ip6gre_tnl_init_features(dev);
1463
1464 return 0;
1465
1466 cleanup_dst_cache_init:
1467 dst_cache_destroy(&tunnel->dst_cache);
1468 cleanup_alloc_pcpu_stats:
1469 free_percpu(dev->tstats);
1470 dev->tstats = NULL;
1471 return ret;
1472 }
1473
1474 static int ip6gre_tunnel_init(struct net_device *dev)
1475 {
1476 struct ip6_tnl *tunnel;
1477 int ret;
1478
1479 ret = ip6gre_tunnel_init_common(dev);
1480 if (ret)
1481 return ret;
1482
1483 tunnel = netdev_priv(dev);
1484
1485 if (tunnel->parms.collect_md)
1486 return 0;
1487
1488 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1489 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1490
1491 if (ipv6_addr_any(&tunnel->parms.raddr))
1492 dev->header_ops = &ip6gre_header_ops;
1493
1494 return 0;
1495 }
1496
1497 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1498 {
1499 struct ip6_tnl *tunnel = netdev_priv(dev);
1500
1501 tunnel->dev = dev;
1502 tunnel->net = dev_net(dev);
1503 strcpy(tunnel->parms.name, dev->name);
1504
1505 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1506
1507 dev_hold(dev);
1508 }
1509
1510 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1511 .handler = gre_rcv,
1512 .err_handler = ip6gre_err,
1513 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1514 };
1515
1516 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1517 {
1518 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1519 struct net_device *dev, *aux;
1520 int prio;
1521
1522 for_each_netdev_safe(net, dev, aux)
1523 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1524 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1525 dev->rtnl_link_ops == &ip6erspan_tap_ops)
1526 unregister_netdevice_queue(dev, head);
1527
1528 for (prio = 0; prio < 4; prio++) {
1529 int h;
1530 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1531 struct ip6_tnl *t;
1532
1533 t = rtnl_dereference(ign->tunnels[prio][h]);
1534
1535 while (t) {
1536 /* If dev is in the same netns, it has already
1537 * been added to the list by the previous loop.
1538 */
1539 if (!net_eq(dev_net(t->dev), net))
1540 unregister_netdevice_queue(t->dev,
1541 head);
1542 t = rtnl_dereference(t->next);
1543 }
1544 }
1545 }
1546 }
1547
1548 static int __net_init ip6gre_init_net(struct net *net)
1549 {
1550 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1551 int err;
1552
1553 if (!net_has_fallback_tunnels(net))
1554 return 0;
1555 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1556 NET_NAME_UNKNOWN,
1557 ip6gre_tunnel_setup);
1558 if (!ign->fb_tunnel_dev) {
1559 err = -ENOMEM;
1560 goto err_alloc_dev;
1561 }
1562 dev_net_set(ign->fb_tunnel_dev, net);
1563 /* FB netdevice is special: we have one, and only one per netns.
1564 * Allowing to move it to another netns is clearly unsafe.
1565 */
1566 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1567
1568
1569 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1570 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1571
1572 err = register_netdev(ign->fb_tunnel_dev);
1573 if (err)
1574 goto err_reg_dev;
1575
1576 rcu_assign_pointer(ign->tunnels_wc[0],
1577 netdev_priv(ign->fb_tunnel_dev));
1578 return 0;
1579
1580 err_reg_dev:
1581 free_netdev(ign->fb_tunnel_dev);
1582 err_alloc_dev:
1583 return err;
1584 }
1585
1586 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1587 {
1588 struct net *net;
1589 LIST_HEAD(list);
1590
1591 rtnl_lock();
1592 list_for_each_entry(net, net_list, exit_list)
1593 ip6gre_destroy_tunnels(net, &list);
1594 unregister_netdevice_many(&list);
1595 rtnl_unlock();
1596 }
1597
1598 static struct pernet_operations ip6gre_net_ops = {
1599 .init = ip6gre_init_net,
1600 .exit_batch = ip6gre_exit_batch_net,
1601 .id = &ip6gre_net_id,
1602 .size = sizeof(struct ip6gre_net),
1603 };
1604
1605 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1606 struct netlink_ext_ack *extack)
1607 {
1608 __be16 flags;
1609
1610 if (!data)
1611 return 0;
1612
1613 flags = 0;
1614 if (data[IFLA_GRE_IFLAGS])
1615 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1616 if (data[IFLA_GRE_OFLAGS])
1617 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1618 if (flags & (GRE_VERSION|GRE_ROUTING))
1619 return -EINVAL;
1620
1621 return 0;
1622 }
1623
1624 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1625 struct netlink_ext_ack *extack)
1626 {
1627 struct in6_addr daddr;
1628
1629 if (tb[IFLA_ADDRESS]) {
1630 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1631 return -EINVAL;
1632 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1633 return -EADDRNOTAVAIL;
1634 }
1635
1636 if (!data)
1637 goto out;
1638
1639 if (data[IFLA_GRE_REMOTE]) {
1640 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1641 if (ipv6_addr_any(&daddr))
1642 return -EINVAL;
1643 }
1644
1645 out:
1646 return ip6gre_tunnel_validate(tb, data, extack);
1647 }
1648
1649 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1650 struct netlink_ext_ack *extack)
1651 {
1652 __be16 flags = 0;
1653 int ret, ver = 0;
1654
1655 if (!data)
1656 return 0;
1657
1658 ret = ip6gre_tap_validate(tb, data, extack);
1659 if (ret)
1660 return ret;
1661
1662 /* ERSPAN should only have GRE sequence and key flag */
1663 if (data[IFLA_GRE_OFLAGS])
1664 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1665 if (data[IFLA_GRE_IFLAGS])
1666 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1667 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1668 flags != (GRE_SEQ | GRE_KEY))
1669 return -EINVAL;
1670
1671 /* ERSPAN Session ID only has 10-bit. Since we reuse
1672 * 32-bit key field as ID, check it's range.
1673 */
1674 if (data[IFLA_GRE_IKEY] &&
1675 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1676 return -EINVAL;
1677
1678 if (data[IFLA_GRE_OKEY] &&
1679 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1680 return -EINVAL;
1681
1682 if (data[IFLA_GRE_ERSPAN_VER]) {
1683 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1684 if (ver != 1 && ver != 2)
1685 return -EINVAL;
1686 }
1687
1688 if (ver == 1) {
1689 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1690 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1691
1692 if (index & ~INDEX_MASK)
1693 return -EINVAL;
1694 }
1695 } else if (ver == 2) {
1696 if (data[IFLA_GRE_ERSPAN_DIR]) {
1697 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1698
1699 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1700 return -EINVAL;
1701 }
1702
1703 if (data[IFLA_GRE_ERSPAN_HWID]) {
1704 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1705
1706 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1707 return -EINVAL;
1708 }
1709 }
1710
1711 return 0;
1712 }
1713
1714 static void ip6gre_netlink_parms(struct nlattr *data[],
1715 struct __ip6_tnl_parm *parms)
1716 {
1717 memset(parms, 0, sizeof(*parms));
1718
1719 if (!data)
1720 return;
1721
1722 if (data[IFLA_GRE_LINK])
1723 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1724
1725 if (data[IFLA_GRE_IFLAGS])
1726 parms->i_flags = gre_flags_to_tnl_flags(
1727 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1728
1729 if (data[IFLA_GRE_OFLAGS])
1730 parms->o_flags = gre_flags_to_tnl_flags(
1731 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1732
1733 if (data[IFLA_GRE_IKEY])
1734 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1735
1736 if (data[IFLA_GRE_OKEY])
1737 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1738
1739 if (data[IFLA_GRE_LOCAL])
1740 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1741
1742 if (data[IFLA_GRE_REMOTE])
1743 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1744
1745 if (data[IFLA_GRE_TTL])
1746 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1747
1748 if (data[IFLA_GRE_ENCAP_LIMIT])
1749 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1750
1751 if (data[IFLA_GRE_FLOWINFO])
1752 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1753
1754 if (data[IFLA_GRE_FLAGS])
1755 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1756
1757 if (data[IFLA_GRE_FWMARK])
1758 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1759
1760 if (data[IFLA_GRE_COLLECT_METADATA])
1761 parms->collect_md = true;
1762
1763 parms->erspan_ver = 1;
1764 if (data[IFLA_GRE_ERSPAN_VER])
1765 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1766
1767 if (parms->erspan_ver == 1) {
1768 if (data[IFLA_GRE_ERSPAN_INDEX])
1769 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1770 } else if (parms->erspan_ver == 2) {
1771 if (data[IFLA_GRE_ERSPAN_DIR])
1772 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1773 if (data[IFLA_GRE_ERSPAN_HWID])
1774 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1775 }
1776 }
1777
1778 static int ip6gre_tap_init(struct net_device *dev)
1779 {
1780 int ret;
1781
1782 ret = ip6gre_tunnel_init_common(dev);
1783 if (ret)
1784 return ret;
1785
1786 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1787
1788 return 0;
1789 }
1790
1791 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1792 .ndo_init = ip6gre_tap_init,
1793 .ndo_uninit = ip6gre_tunnel_uninit,
1794 .ndo_start_xmit = ip6gre_tunnel_xmit,
1795 .ndo_set_mac_address = eth_mac_addr,
1796 .ndo_validate_addr = eth_validate_addr,
1797 .ndo_change_mtu = ip6_tnl_change_mtu,
1798 .ndo_get_stats64 = ip_tunnel_get_stats64,
1799 .ndo_get_iflink = ip6_tnl_get_iflink,
1800 };
1801
1802 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1803 {
1804 int t_hlen;
1805
1806 tunnel->tun_hlen = 8;
1807 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1808 erspan_hdr_len(tunnel->parms.erspan_ver);
1809
1810 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1811 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1812 return t_hlen;
1813 }
1814
1815 static int ip6erspan_tap_init(struct net_device *dev)
1816 {
1817 struct ip6_tnl *tunnel;
1818 int t_hlen;
1819 int ret;
1820
1821 tunnel = netdev_priv(dev);
1822
1823 tunnel->dev = dev;
1824 tunnel->net = dev_net(dev);
1825 strcpy(tunnel->parms.name, dev->name);
1826
1827 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1828 if (!dev->tstats)
1829 return -ENOMEM;
1830
1831 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1832 if (ret)
1833 goto cleanup_alloc_pcpu_stats;
1834
1835 ret = gro_cells_init(&tunnel->gro_cells, dev);
1836 if (ret)
1837 goto cleanup_dst_cache_init;
1838
1839 t_hlen = ip6erspan_calc_hlen(tunnel);
1840 dev->mtu = ETH_DATA_LEN - t_hlen;
1841 if (dev->type == ARPHRD_ETHER)
1842 dev->mtu -= ETH_HLEN;
1843 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1844 dev->mtu -= 8;
1845
1846 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1847 ip6erspan_tnl_link_config(tunnel, 1);
1848
1849 return 0;
1850
1851 cleanup_dst_cache_init:
1852 dst_cache_destroy(&tunnel->dst_cache);
1853 cleanup_alloc_pcpu_stats:
1854 free_percpu(dev->tstats);
1855 dev->tstats = NULL;
1856 return ret;
1857 }
1858
1859 static const struct net_device_ops ip6erspan_netdev_ops = {
1860 .ndo_init = ip6erspan_tap_init,
1861 .ndo_uninit = ip6erspan_tunnel_uninit,
1862 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1863 .ndo_set_mac_address = eth_mac_addr,
1864 .ndo_validate_addr = eth_validate_addr,
1865 .ndo_change_mtu = ip6_tnl_change_mtu,
1866 .ndo_get_stats64 = ip_tunnel_get_stats64,
1867 .ndo_get_iflink = ip6_tnl_get_iflink,
1868 };
1869
1870 static void ip6gre_tap_setup(struct net_device *dev)
1871 {
1872
1873 ether_setup(dev);
1874
1875 dev->max_mtu = 0;
1876 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1877 dev->needs_free_netdev = true;
1878 dev->priv_destructor = ip6gre_dev_free;
1879
1880 dev->features |= NETIF_F_NETNS_LOCAL;
1881 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1882 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1883 netif_keep_dst(dev);
1884 }
1885
1886 bool is_ip6gretap_dev(const struct net_device *dev)
1887 {
1888 return dev->netdev_ops == &ip6gre_tap_netdev_ops;
1889 }
1890 EXPORT_SYMBOL_GPL(is_ip6gretap_dev);
1891
1892 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1893 struct ip_tunnel_encap *ipencap)
1894 {
1895 bool ret = false;
1896
1897 memset(ipencap, 0, sizeof(*ipencap));
1898
1899 if (!data)
1900 return ret;
1901
1902 if (data[IFLA_GRE_ENCAP_TYPE]) {
1903 ret = true;
1904 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1905 }
1906
1907 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1908 ret = true;
1909 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1910 }
1911
1912 if (data[IFLA_GRE_ENCAP_SPORT]) {
1913 ret = true;
1914 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1915 }
1916
1917 if (data[IFLA_GRE_ENCAP_DPORT]) {
1918 ret = true;
1919 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1920 }
1921
1922 return ret;
1923 }
1924
1925 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1926 struct nlattr *tb[], struct nlattr *data[],
1927 struct netlink_ext_ack *extack)
1928 {
1929 struct ip6_tnl *nt;
1930 struct ip_tunnel_encap ipencap;
1931 int err;
1932
1933 nt = netdev_priv(dev);
1934
1935 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1936 int err = ip6_tnl_encap_setup(nt, &ipencap);
1937
1938 if (err < 0)
1939 return err;
1940 }
1941
1942 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1943 eth_hw_addr_random(dev);
1944
1945 nt->dev = dev;
1946 nt->net = dev_net(dev);
1947
1948 err = register_netdevice(dev);
1949 if (err)
1950 goto out;
1951
1952 if (tb[IFLA_MTU])
1953 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1954
1955 dev_hold(dev);
1956
1957 out:
1958 return err;
1959 }
1960
1961 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1962 struct nlattr *tb[], struct nlattr *data[],
1963 struct netlink_ext_ack *extack)
1964 {
1965 struct ip6_tnl *nt = netdev_priv(dev);
1966 struct net *net = dev_net(dev);
1967 struct ip6gre_net *ign;
1968 int err;
1969
1970 ip6gre_netlink_parms(data, &nt->parms);
1971 ign = net_generic(net, ip6gre_net_id);
1972
1973 if (nt->parms.collect_md) {
1974 if (rtnl_dereference(ign->collect_md_tun))
1975 return -EEXIST;
1976 } else {
1977 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1978 return -EEXIST;
1979 }
1980
1981 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
1982 if (!err) {
1983 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1984 ip6gre_tunnel_link_md(ign, nt);
1985 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
1986 }
1987 return err;
1988 }
1989
1990 static struct ip6_tnl *
1991 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
1992 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
1993 struct netlink_ext_ack *extack)
1994 {
1995 struct ip6_tnl *t, *nt = netdev_priv(dev);
1996 struct net *net = nt->net;
1997 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1998 struct ip_tunnel_encap ipencap;
1999
2000 if (dev == ign->fb_tunnel_dev)
2001 return ERR_PTR(-EINVAL);
2002
2003 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2004 int err = ip6_tnl_encap_setup(nt, &ipencap);
2005
2006 if (err < 0)
2007 return ERR_PTR(err);
2008 }
2009
2010 ip6gre_netlink_parms(data, p_p);
2011
2012 t = ip6gre_tunnel_locate(net, p_p, 0);
2013
2014 if (t) {
2015 if (t->dev != dev)
2016 return ERR_PTR(-EEXIST);
2017 } else {
2018 t = nt;
2019 }
2020
2021 return t;
2022 }
2023
2024 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2025 struct nlattr *data[],
2026 struct netlink_ext_ack *extack)
2027 {
2028 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2029 struct __ip6_tnl_parm p;
2030 struct ip6_tnl *t;
2031
2032 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2033 if (IS_ERR(t))
2034 return PTR_ERR(t);
2035
2036 ip6gre_tunnel_unlink_md(ign, t);
2037 ip6gre_tunnel_unlink(ign, t);
2038 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2039 ip6gre_tunnel_link_md(ign, t);
2040 ip6gre_tunnel_link(ign, t);
2041 return 0;
2042 }
2043
2044 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2045 {
2046 struct net *net = dev_net(dev);
2047 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2048
2049 if (dev != ign->fb_tunnel_dev)
2050 unregister_netdevice_queue(dev, head);
2051 }
2052
2053 static size_t ip6gre_get_size(const struct net_device *dev)
2054 {
2055 return
2056 /* IFLA_GRE_LINK */
2057 nla_total_size(4) +
2058 /* IFLA_GRE_IFLAGS */
2059 nla_total_size(2) +
2060 /* IFLA_GRE_OFLAGS */
2061 nla_total_size(2) +
2062 /* IFLA_GRE_IKEY */
2063 nla_total_size(4) +
2064 /* IFLA_GRE_OKEY */
2065 nla_total_size(4) +
2066 /* IFLA_GRE_LOCAL */
2067 nla_total_size(sizeof(struct in6_addr)) +
2068 /* IFLA_GRE_REMOTE */
2069 nla_total_size(sizeof(struct in6_addr)) +
2070 /* IFLA_GRE_TTL */
2071 nla_total_size(1) +
2072 /* IFLA_GRE_ENCAP_LIMIT */
2073 nla_total_size(1) +
2074 /* IFLA_GRE_FLOWINFO */
2075 nla_total_size(4) +
2076 /* IFLA_GRE_FLAGS */
2077 nla_total_size(4) +
2078 /* IFLA_GRE_ENCAP_TYPE */
2079 nla_total_size(2) +
2080 /* IFLA_GRE_ENCAP_FLAGS */
2081 nla_total_size(2) +
2082 /* IFLA_GRE_ENCAP_SPORT */
2083 nla_total_size(2) +
2084 /* IFLA_GRE_ENCAP_DPORT */
2085 nla_total_size(2) +
2086 /* IFLA_GRE_COLLECT_METADATA */
2087 nla_total_size(0) +
2088 /* IFLA_GRE_FWMARK */
2089 nla_total_size(4) +
2090 /* IFLA_GRE_ERSPAN_INDEX */
2091 nla_total_size(4) +
2092 0;
2093 }
2094
2095 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2096 {
2097 struct ip6_tnl *t = netdev_priv(dev);
2098 struct __ip6_tnl_parm *p = &t->parms;
2099
2100 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2101 nla_put_be16(skb, IFLA_GRE_IFLAGS,
2102 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2103 nla_put_be16(skb, IFLA_GRE_OFLAGS,
2104 gre_tnl_flags_to_gre_flags(p->o_flags)) ||
2105 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2106 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2107 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2108 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2109 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2110 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2111 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2112 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2113 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark) ||
2114 nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2115 goto nla_put_failure;
2116
2117 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2118 t->encap.type) ||
2119 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2120 t->encap.sport) ||
2121 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2122 t->encap.dport) ||
2123 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2124 t->encap.flags))
2125 goto nla_put_failure;
2126
2127 if (p->collect_md) {
2128 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2129 goto nla_put_failure;
2130 }
2131
2132 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2133 goto nla_put_failure;
2134
2135 if (p->erspan_ver == 1) {
2136 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2137 goto nla_put_failure;
2138 } else if (p->erspan_ver == 2) {
2139 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2140 goto nla_put_failure;
2141 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2142 goto nla_put_failure;
2143 }
2144
2145 return 0;
2146
2147 nla_put_failure:
2148 return -EMSGSIZE;
2149 }
2150
2151 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2152 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2153 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2154 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2155 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2156 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2157 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
2158 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
2159 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2160 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2161 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2162 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
2163 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2164 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2165 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2166 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
2167 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2168 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
2169 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2170 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2171 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2172 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
2173 };
2174
2175 static void ip6erspan_tap_setup(struct net_device *dev)
2176 {
2177 ether_setup(dev);
2178
2179 dev->netdev_ops = &ip6erspan_netdev_ops;
2180 dev->needs_free_netdev = true;
2181 dev->priv_destructor = ip6gre_dev_free;
2182
2183 dev->features |= NETIF_F_NETNS_LOCAL;
2184 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2185 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2186 netif_keep_dst(dev);
2187 }
2188
2189 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2190 struct nlattr *tb[], struct nlattr *data[],
2191 struct netlink_ext_ack *extack)
2192 {
2193 struct ip6_tnl *nt = netdev_priv(dev);
2194 struct net *net = dev_net(dev);
2195 struct ip6gre_net *ign;
2196 int err;
2197
2198 ip6gre_netlink_parms(data, &nt->parms);
2199 ign = net_generic(net, ip6gre_net_id);
2200
2201 if (nt->parms.collect_md) {
2202 if (rtnl_dereference(ign->collect_md_tun_erspan))
2203 return -EEXIST;
2204 } else {
2205 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2206 return -EEXIST;
2207 }
2208
2209 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2210 if (!err) {
2211 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2212 ip6erspan_tunnel_link_md(ign, nt);
2213 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2214 }
2215 return err;
2216 }
2217
2218 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2219 {
2220 ip6gre_tnl_link_config_common(t);
2221 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2222 }
2223
2224 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2225 const struct __ip6_tnl_parm *p, int set_mtu)
2226 {
2227 ip6gre_tnl_copy_tnl_parm(t, p);
2228 ip6erspan_tnl_link_config(t, set_mtu);
2229 return 0;
2230 }
2231
2232 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2233 struct nlattr *data[],
2234 struct netlink_ext_ack *extack)
2235 {
2236 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2237 struct __ip6_tnl_parm p;
2238 struct ip6_tnl *t;
2239
2240 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2241 if (IS_ERR(t))
2242 return PTR_ERR(t);
2243
2244 ip6gre_tunnel_unlink_md(ign, t);
2245 ip6gre_tunnel_unlink(ign, t);
2246 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2247 ip6erspan_tunnel_link_md(ign, t);
2248 ip6gre_tunnel_link(ign, t);
2249 return 0;
2250 }
2251
2252 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2253 .kind = "ip6gre",
2254 .maxtype = IFLA_GRE_MAX,
2255 .policy = ip6gre_policy,
2256 .priv_size = sizeof(struct ip6_tnl),
2257 .setup = ip6gre_tunnel_setup,
2258 .validate = ip6gre_tunnel_validate,
2259 .newlink = ip6gre_newlink,
2260 .changelink = ip6gre_changelink,
2261 .dellink = ip6gre_dellink,
2262 .get_size = ip6gre_get_size,
2263 .fill_info = ip6gre_fill_info,
2264 .get_link_net = ip6_tnl_get_link_net,
2265 };
2266
2267 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2268 .kind = "ip6gretap",
2269 .maxtype = IFLA_GRE_MAX,
2270 .policy = ip6gre_policy,
2271 .priv_size = sizeof(struct ip6_tnl),
2272 .setup = ip6gre_tap_setup,
2273 .validate = ip6gre_tap_validate,
2274 .newlink = ip6gre_newlink,
2275 .changelink = ip6gre_changelink,
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 ip6erspan_tap_ops __read_mostly = {
2282 .kind = "ip6erspan",
2283 .maxtype = IFLA_GRE_MAX,
2284 .policy = ip6gre_policy,
2285 .priv_size = sizeof(struct ip6_tnl),
2286 .setup = ip6erspan_tap_setup,
2287 .validate = ip6erspan_tap_validate,
2288 .newlink = ip6erspan_newlink,
2289 .changelink = ip6erspan_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 /*
2296 * And now the modules code and kernel interface.
2297 */
2298
2299 static int __init ip6gre_init(void)
2300 {
2301 int err;
2302
2303 pr_info("GRE over IPv6 tunneling driver\n");
2304
2305 err = register_pernet_device(&ip6gre_net_ops);
2306 if (err < 0)
2307 return err;
2308
2309 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2310 if (err < 0) {
2311 pr_info("%s: can't add protocol\n", __func__);
2312 goto add_proto_failed;
2313 }
2314
2315 err = rtnl_link_register(&ip6gre_link_ops);
2316 if (err < 0)
2317 goto rtnl_link_failed;
2318
2319 err = rtnl_link_register(&ip6gre_tap_ops);
2320 if (err < 0)
2321 goto tap_ops_failed;
2322
2323 err = rtnl_link_register(&ip6erspan_tap_ops);
2324 if (err < 0)
2325 goto erspan_link_failed;
2326
2327 out:
2328 return err;
2329
2330 erspan_link_failed:
2331 rtnl_link_unregister(&ip6gre_tap_ops);
2332 tap_ops_failed:
2333 rtnl_link_unregister(&ip6gre_link_ops);
2334 rtnl_link_failed:
2335 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2336 add_proto_failed:
2337 unregister_pernet_device(&ip6gre_net_ops);
2338 goto out;
2339 }
2340
2341 static void __exit ip6gre_fini(void)
2342 {
2343 rtnl_link_unregister(&ip6gre_tap_ops);
2344 rtnl_link_unregister(&ip6gre_link_ops);
2345 rtnl_link_unregister(&ip6erspan_tap_ops);
2346 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2347 unregister_pernet_device(&ip6gre_net_ops);
2348 }
2349
2350 module_init(ip6gre_init);
2351 module_exit(ip6gre_fini);
2352 MODULE_LICENSE("GPL");
2353 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2354 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2355 MODULE_ALIAS_RTNL_LINK("ip6gre");
2356 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2357 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2358 MODULE_ALIAS_NETDEV("ip6gre0");
Linux with added FPC-III support