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Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf
[linux-block.git] / net / ipv6 / ip6_gre.c
CommitLineData
c12b395a 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>
c12b395a 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>
c5441932 40#include <net/ip_tunnels.h>
c12b395a 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>
308edfdf 57#include <net/gre.h>
5a963eb6 58#include <net/erspan.h>
6712abc1 59#include <net/dst_metadata.h>
c12b395a 60
61
eccc1bb8 62static bool log_ecn_error = true;
63module_param(log_ecn_error, bool, 0644);
64MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
65
e87a8f24
JK		 66#define IP6_GRE_HASH_SIZE_SHIFT 5
67#define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
c12b395a 68
c7d03a00 69static unsigned int ip6gre_net_id __read_mostly;
c12b395a 70struct ip6gre_net {
e87a8f24 71 struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
c12b395a 72
6712abc1 73 struct ip6_tnl __rcu *collect_md_tun;
b80d0b93 74 struct ip6_tnl __rcu *collect_md_tun_erspan;
c12b395a 75 struct net_device *fb_tunnel_dev;
76};
77
78static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
22f08069 79static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
5a963eb6 80static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly;
c12b395a 81static int ip6gre_tunnel_init(struct net_device *dev);
82static void ip6gre_tunnel_setup(struct net_device *dev);
83static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
84static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
2d665034 85static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu);
c12b395a 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
e87a8f24 105#define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
c12b395a 106static u32 HASH_ADDR(const struct in6_addr *addr)
107{
108 u32 hash = ipv6_addr_hash(addr);
109
e87a8f24 110 return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
c12b395a 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]
c12b395a 117
c12b395a 118/* Given src, dst and key, find appropriate for input tunnel. */
119
120static 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);
5a963eb6 130 int dev_type = (gre_proto == htons(ETH_P_TEB) ||
3b04caab
WT		 131 gre_proto == htons(ETH_P_ERSPAN) ||
132 gre_proto == htons(ETH_P_ERSPAN2)) ?
c12b395a 133 ARPHRD_ETHER : ARPHRD_IP6GRE;
134 int score, cand_score = 4;
135
e086cadc 136 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
c12b395a 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
e086cadc 161 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
c12b395a 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
e086cadc 185 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
c12b395a 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
e086cadc 211 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
c12b395a 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
53b24b8f 234 if (cand)
c12b395a 235 return cand;
236
b80d0b93
WT		 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
6712abc1
WT		 243 if (t && t->dev->flags & IFF_UP)
244 return t;
245
c12b395a 246 dev = ign->fb_tunnel_dev;
79134e6c 247 if (dev && dev->flags & IFF_UP)
c12b395a 248 return netdev_priv(dev);
249
250 return NULL;
251}
252
253static 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
b80d0b93
WT		 271static 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
277static 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
283static 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
289static 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
c12b395a 296static 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
302static 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
310static 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
325static 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
350static 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);
cd0a0bd9
SK		 359 if (t && create)
360 return NULL;
c12b395a 361 if (t || !create)
362 return t;
363
5f42df01
ED		 364 if (parms->name[0]) {
365 if (!dev_valid_name(parms->name))
366 return NULL;
c12b395a 367 strlcpy(name, parms->name, IFNAMSIZ);
5f42df01 368 } else {
c12b395a 369 strcpy(name, "ip6gre%d");
5f42df01 370 }
c835a677
TG		 371 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
372 ip6gre_tunnel_setup);
c12b395a 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;
0bd87628 383 nt->net = dev_net(dev);
c12b395a 384
385 if (register_netdevice(dev) < 0)
386 goto failed_free;
387
128bb975
AK		 388 ip6gre_tnl_link_config(nt, 1);
389
c12b395a 390 /* Can use a lockless transmit, unless we generate output sequences */
b45bd1d7 391 if (!(nt->parms.o_flags & TUNNEL_SEQ))
c12b395a 392 dev->features |= NETIF_F_LLTX;
393
394 dev_hold(dev);
395 ip6gre_tunnel_link(ign, nt);
396 return nt;
397
398failed_free:
399 free_netdev(dev);
400 return NULL;
401}
402
b80d0b93
WT		 403static 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
c12b395a 414static void ip6gre_tunnel_uninit(struct net_device *dev)
415{
22f08069
ND		 416 struct ip6_tnl *t = netdev_priv(dev);
417 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
c12b395a 418
b80d0b93 419 ip6gre_tunnel_unlink_md(ign, t);
22f08069 420 ip6gre_tunnel_unlink(ign, t);
607f725f 421 dst_cache_reset(&t->dst_cache);
c12b395a 422 dev_put(dev);
423}
424
425
32bbd879 426static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
7892032c 427 u8 type, u8 code, int offset, __be32 info)
c12b395a 428{
929fc032 429 struct net *net = dev_net(skb->dev);
7892032c 430 const struct ipv6hdr *ipv6h;
a82738ad 431 struct tnl_ptk_info tpi;
c12b395a 432 struct ip6_tnl *t;
c12b395a 433
a82738ad
HY		 434 if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6),
435 offset) < 0)
32bbd879 436 return -EINVAL;
c12b395a 437
b87fb39e 438 ipv6h = (const struct ipv6hdr *)skb->data;
c12b395a 439 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
a82738ad 440 tpi.key, tpi.proto);
63159f29 441 if (!t)
32bbd879 442 return -ENOENT;
c12b395a 443
444 switch (type) {
c12b395a 445 struct ipv6_tlv_tnl_enc_lim *tel;
fe1a4ca0 446 __u32 teli;
c12b395a 447 case ICMPV6_DEST_UNREACH:
a46496ce
MB		 448 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
449 t->parms.name);
f8d20b46
XL		 450 if (code != ICMPV6_PORT_UNREACH)
451 break;
32bbd879 452 return 0;
c12b395a 453 case ICMPV6_TIME_EXCEED:
454 if (code == ICMPV6_EXC_HOPLIMIT) {
a46496ce
MB		 455 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
456 t->parms.name);
f8d20b46 457 break;
c12b395a 458 }
32bbd879 459 return 0;
c12b395a 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
d1e158e2 465 if (teli && teli == be32_to_cpu(info) - 2) {
c12b395a 466 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
467 if (tel->encap_limit == 0) {
a46496ce
MB		 468 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
469 t->parms.name);
c12b395a 470 }
471 } else {
a46496ce
MB		 472 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
473 t->parms.name);
c12b395a 474 }
32bbd879 475 return 0;
c12b395a 476 case ICMPV6_PKT_TOOBIG:
fe1a4ca0 477 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
32bbd879 478 return 0;
929fc032
XL		 479 case NDISC_REDIRECT:
480 ip6_redirect(skb, net, skb->dev->ifindex, 0,
481 sock_net_uid(net, NULL));
32bbd879 482 return 0;
c12b395a 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;
32bbd879
SB		 490
491 return 0;
c12b395a 492}
493
308edfdf 494static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
c12b395a 495{
496 const struct ipv6hdr *ipv6h;
c12b395a 497 struct ip6_tnl *tunnel;
c12b395a 498
499 ipv6h = ipv6_hdr(skb);
c12b395a 500 tunnel = ip6gre_tunnel_lookup(skb->dev,
308edfdf
TH		 501 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
502 tpi->proto);
c12b395a 503 if (tunnel) {
6712abc1
WT		 504 if (tunnel->parms.collect_md) {
505 struct metadata_dst *tun_dst;
506 __be64 tun_id;
507 __be16 flags;
508
509 flags = tpi->flags;
510 tun_id = key32_to_tunnel_id(tpi->key);
511
512 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
513 if (!tun_dst)
514 return PACKET_REJECT;
515
516 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
517 } else {
518 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
519 }
c12b395a 520
308edfdf
TH		 521 return PACKET_RCVD;
522 }
eccc1bb8 523
308edfdf
TH		 524 return PACKET_REJECT;
525}
eccc1bb8 526
5a963eb6
WT		 527static int ip6erspan_rcv(struct sk_buff *skb, int gre_hdr_len,
528 struct tnl_ptk_info *tpi)
529{
1d7e2ed2
WT		 530 struct erspan_base_hdr *ershdr;
531 struct erspan_metadata *pkt_md;
5a963eb6 532 const struct ipv6hdr *ipv6h;
3df19283 533 struct erspan_md2 *md2;
5a963eb6 534 struct ip6_tnl *tunnel;
1d7e2ed2 535 u8 ver;
5a963eb6 536
5a963eb6
WT		 537 if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr))))
538 return PACKET_REJECT;
539
293a1991
HY		 540 ipv6h = ipv6_hdr(skb);
541 ershdr = (struct erspan_base_hdr *)skb->data;
c69de58b
WT		 542 ver = ershdr->ver;
543 tpi->key = cpu_to_be32(get_session_id(ershdr));
5a963eb6
WT		 544
545 tunnel = ip6gre_tunnel_lookup(skb->dev,
546 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
547 tpi->proto);
548 if (tunnel) {
1d7e2ed2
WT		 549 int len = erspan_hdr_len(ver);
550
551 if (unlikely(!pskb_may_pull(skb, len)))
ae3e1337 552 return PACKET_REJECT;
1d7e2ed2 553
d91e8db5
WT		 554 ershdr = (struct erspan_base_hdr *)skb->data;
555 pkt_md = (struct erspan_metadata *)(ershdr + 1);
556
1d7e2ed2 557 if (__iptunnel_pull_header(skb, len,
5a963eb6
WT		 558 htons(ETH_P_TEB),
559 false, false) < 0)
560 return PACKET_REJECT;
561
ef7baf5e
WT		 562 if (tunnel->parms.collect_md) {
563 struct metadata_dst *tun_dst;
564 struct ip_tunnel_info *info;
565 struct erspan_metadata *md;
566 __be64 tun_id;
567 __be16 flags;
568
569 tpi->flags |= TUNNEL_KEY;
570 flags = tpi->flags;
571 tun_id = key32_to_tunnel_id(tpi->key);
572
573 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
574 sizeof(*md));
575 if (!tun_dst)
576 return PACKET_REJECT;
577
578 info = &tun_dst->u.tun_info;
579 md = ip_tunnel_info_opts(info);
94d7d8f2 580 md->version = ver;
3df19283
WT		 581 md2 = &md->u.md2;
582 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
583 ERSPAN_V2_MDSIZE);
ef7baf5e
WT		 584 info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
585 info->options_len = sizeof(*md);
586
587 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
588
589 } else {
ef7baf5e
WT		 590 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
591 }
5a963eb6
WT		 592
593 return PACKET_RCVD;
594 }
595
596 return PACKET_REJECT;
597}
598
308edfdf
TH		 599static int gre_rcv(struct sk_buff *skb)
600{
601 struct tnl_ptk_info tpi;
602 bool csum_err = false;
603 int hdr_len;
eccc1bb8 604
e582615a 605 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
f132ae7c 606 if (hdr_len < 0)
308edfdf 607 goto drop;
c12b395a 608
308edfdf
TH		 609 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
610 goto drop;
c12b395a 611
94d7d8f2
WT		 612 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
613 tpi.proto == htons(ETH_P_ERSPAN2))) {
5a963eb6
WT		 614 if (ip6erspan_rcv(skb, hdr_len, &tpi) == PACKET_RCVD)
615 return 0;
a7343211 616 goto out;
5a963eb6
WT		 617 }
618
308edfdf 619 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
c12b395a 620 return 0;
c12b395a 621
a7343211 622out:
308edfdf 623 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
c12b395a 624drop:
c12b395a 625 kfree_skb(skb);
626 return 0;
627}
628
b05229f4 629static int gre_handle_offloads(struct sk_buff *skb, bool csum)
c12b395a 630{
b05229f4
TH		 631 return iptunnel_handle_offloads(skb,
632 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
c12b395a 633}
634
898b2979
WT		 635static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
636 struct net_device *dev,
637 struct flowi6 *fl6, __u8 *dsfield,
638 int *encap_limit)
639{
640 const struct iphdr *iph = ip_hdr(skb);
641 struct ip6_tnl *t = netdev_priv(dev);
642
643 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
644 *encap_limit = t->parms.encap_limit;
645
646 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
647
648 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
649 *dsfield = ipv4_get_dsfield(iph);
650 else
651 *dsfield = ip6_tclass(t->parms.flowinfo);
652
653 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
654 fl6->flowi6_mark = skb->mark;
655 else
656 fl6->flowi6_mark = t->parms.fwmark;
657
658 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
659}
660
661static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
662 struct net_device *dev,
663 struct flowi6 *fl6, __u8 *dsfield,
664 int *encap_limit)
665{
666 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
667 struct ip6_tnl *t = netdev_priv(dev);
668 __u16 offset;
669
670 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
671 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
672
673 if (offset > 0) {
674 struct ipv6_tlv_tnl_enc_lim *tel;
675
676 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
677 if (tel->encap_limit == 0) {
678 icmpv6_send(skb, ICMPV6_PARAMPROB,
679 ICMPV6_HDR_FIELD, offset + 2);
680 return -1;
681 }
682 *encap_limit = tel->encap_limit - 1;
683 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
684 *encap_limit = t->parms.encap_limit;
685 }
686
687 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
688
689 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
690 *dsfield = ipv6_get_dsfield(ipv6h);
691 else
692 *dsfield = ip6_tclass(t->parms.flowinfo);
693
694 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
695 fl6->flowlabel |= ip6_flowlabel(ipv6h);
696
697 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
698 fl6->flowi6_mark = skb->mark;
699 else
700 fl6->flowi6_mark = t->parms.fwmark;
701
702 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
703
704 return 0;
705}
706
b05229f4
TH		 707static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
708 struct net_device *dev, __u8 dsfield,
709 struct flowi6 *fl6, int encap_limit,
710 __u32 *pmtu, __be16 proto)
c12b395a 711{
c12b395a 712 struct ip6_tnl *tunnel = netdev_priv(dev);
8aec4959 713 __be16 protocol;
c12b395a 714
715 if (dev->type == ARPHRD_ETHER)
716 IPCB(skb)->flags = 0;
717
b05229f4
TH		 718 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
719 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
720 else
c12b395a 721 fl6->daddr = tunnel->parms.raddr;
c12b395a 722
01b8d064
PM		 723 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
724 return -ENOMEM;
725
b05229f4 726 /* Push GRE header. */
8aec4959 727 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
6712abc1
WT		 728
729 if (tunnel->parms.collect_md) {
730 struct ip_tunnel_info *tun_info;
731 const struct ip_tunnel_key *key;
732 __be16 flags;
733
734 tun_info = skb_tunnel_info(skb);
735 if (unlikely(!tun_info ||
736 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
737 ip_tunnel_info_af(tun_info) != AF_INET6))
738 return -EINVAL;
739
740 key = &tun_info->key;
741 memset(fl6, 0, sizeof(*fl6));
742 fl6->flowi6_proto = IPPROTO_GRE;
743 fl6->daddr = key->u.ipv6.dst;
744 fl6->flowlabel = key->label;
745 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
746
747 dsfield = key->tos;
77a5196a
WT		 748 flags = key->tun_flags &
749 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
6712abc1
WT		 750 tunnel->tun_hlen = gre_calc_hlen(flags);
751
752 gre_build_header(skb, tunnel->tun_hlen,
753 flags, protocol,
77a5196a 754 tunnel_id_to_key32(tun_info->key.tun_id),
15746394 755 (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++)
77a5196a 756 : 0);
6712abc1
WT		 757
758 } else {
77a5196a
WT		 759 if (tunnel->parms.o_flags & TUNNEL_SEQ)
760 tunnel->o_seqno++;
761
6712abc1
WT		 762 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
763 protocol, tunnel->parms.o_key,
764 htonl(tunnel->o_seqno));
765 }
c12b395a 766
b05229f4
TH		 767 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
768 NEXTHDR_GRE);
c12b395a 769}
770
771static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
772{
773 struct ip6_tnl *t = netdev_priv(dev);
c12b395a 774 int encap_limit = -1;
775 struct flowi6 fl6;
6712abc1 776 __u8 dsfield = 0;
c12b395a 777 __u32 mtu;
778 int err;
779
5146d1f1
BH		 780 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
781
6712abc1
WT		 782 if (!t->parms.collect_md)
783 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
784 &dsfield, &encap_limit);
e2d118a1 785
b05229f4
TH		 786 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
787 if (err)
788 return -1;
789
790 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
791 skb->protocol);
c12b395a 792 if (err != 0) {
793 /* XXX: send ICMP error even if DF is not set. */
794 if (err == -EMSGSIZE)
795 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
796 htonl(mtu));
797 return -1;
798 }
799
800 return 0;
801}
802
803static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
804{
805 struct ip6_tnl *t = netdev_priv(dev);
806 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
807 int encap_limit = -1;
c12b395a 808 struct flowi6 fl6;
6712abc1 809 __u8 dsfield = 0;
c12b395a 810 __u32 mtu;
811 int err;
812
813 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
814 return -1;
815
6712abc1
WT		 816 if (!t->parms.collect_md &&
817 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
898b2979 818 return -1;
e2d118a1 819
b05229f4
TH		 820 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
821 return -1;
822
823 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
824 &mtu, skb->protocol);
c12b395a 825 if (err != 0) {
826 if (err == -EMSGSIZE)
827 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
828 return -1;
829 }
830
831 return 0;
832}
833
834/**
7ccbdff1 835 * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own
c12b395a 836 * @t: the outgoing tunnel device
837 * @hdr: IPv6 header from the incoming packet
838 *
839 * Description:
840 * Avoid trivial tunneling loop by checking that tunnel exit-point
841 * doesn't match source of incoming packet.
842 *
843 * Return:
844 * 1 if conflict,
845 * 0 else
846 **/
847
848static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
849 const struct ipv6hdr *hdr)
850{
851 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
852}
853
854static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
855{
856 struct ip6_tnl *t = netdev_priv(dev);
857 int encap_limit = -1;
858 struct flowi6 fl6;
859 __u32 mtu;
860 int err;
861
862 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
863 encap_limit = t->parms.encap_limit;
864
6712abc1
WT		 865 if (!t->parms.collect_md)
866 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
c12b395a 867
b05229f4
TH		 868 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
869 if (err)
870 return err;
871
872 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
c12b395a 873
874 return err;
875}
876
877static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
878 struct net_device *dev)
879{
880 struct ip6_tnl *t = netdev_priv(dev);
881 struct net_device_stats *stats = &t->dev->stats;
882 int ret;
883
cb9f1b78
WB		 884 if (!pskb_inet_may_pull(skb))
885 goto tx_err;
886
d5005140 887 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
41ab3e31 888 goto tx_err;
c12b395a 889
890 switch (skb->protocol) {
891 case htons(ETH_P_IP):
892 ret = ip6gre_xmit_ipv4(skb, dev);
893 break;
894 case htons(ETH_P_IPV6):
895 ret = ip6gre_xmit_ipv6(skb, dev);
896 break;
897 default:
898 ret = ip6gre_xmit_other(skb, dev);
899 break;
900 }
901
902 if (ret < 0)
903 goto tx_err;
904
905 return NETDEV_TX_OK;
906
907tx_err:
908 stats->tx_errors++;
909 stats->tx_dropped++;
910 kfree_skb(skb);
911 return NETDEV_TX_OK;
912}
913
5a963eb6
WT		 914static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
915 struct net_device *dev)
916{
5a963eb6
WT		 917 struct ip6_tnl *t = netdev_priv(dev);
918 struct dst_entry *dst = skb_dst(skb);
919 struct net_device_stats *stats;
920 bool truncate = false;
921 int encap_limit = -1;
922 __u8 dsfield = false;
923 struct flowi6 fl6;
924 int err = -EINVAL;
925 __u32 mtu;
1baf5ebf 926 int nhoff;
d5db21a3 927 int thoff;
5a963eb6 928
cb9f1b78
WB		 929 if (!pskb_inet_may_pull(skb))
930 goto tx_err;
931
5a963eb6
WT		 932 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
933 goto tx_err;
934
935 if (gre_handle_offloads(skb, false))
936 goto tx_err;
937
5a963eb6
WT		 938 if (skb->len > dev->mtu + dev->hard_header_len) {
939 pskb_trim(skb, dev->mtu + dev->hard_header_len);
940 truncate = true;
941 }
942
1baf5ebf
WT		 943 nhoff = skb_network_header(skb) - skb_mac_header(skb);
944 if (skb->protocol == htons(ETH_P_IP) &&
945 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
946 truncate = true;
947
d5db21a3
WT		 948 thoff = skb_transport_header(skb) - skb_mac_header(skb);
949 if (skb->protocol == htons(ETH_P_IPV6) &&
950 (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff))
951 truncate = true;
952
5691484d 953 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
e41c7c68
WT		 954 goto tx_err;
955
5a963eb6 956 t->parms.o_flags &= ~TUNNEL_KEY;
5a963eb6 957 IPCB(skb)->flags = 0;
ef7baf5e
WT		 958
959 /* For collect_md mode, derive fl6 from the tunnel key,
960 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
961 */
962 if (t->parms.collect_md) {
963 struct ip_tunnel_info *tun_info;
964 const struct ip_tunnel_key *key;
965 struct erspan_metadata *md;
c69de58b 966 __be32 tun_id;
ef7baf5e
WT		 967
968 tun_info = skb_tunnel_info(skb);
969 if (unlikely(!tun_info ||
970 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
971 ip_tunnel_info_af(tun_info) != AF_INET6))
972 return -EINVAL;
973
974 key = &tun_info->key;
975 memset(&fl6, 0, sizeof(fl6));
976 fl6.flowi6_proto = IPPROTO_GRE;
977 fl6.daddr = key->u.ipv6.dst;
978 fl6.flowlabel = key->label;
979 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
980
981 dsfield = key->tos;
256c87c1
PJV		 982 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
983 goto tx_err;
ef7baf5e
WT		 984 md = ip_tunnel_info_opts(tun_info);
985 if (!md)
986 goto tx_err;
987
c69de58b 988 tun_id = tunnel_id_to_key32(key->tun_id);
94d7d8f2
WT		 989 if (md->version == 1) {
990 erspan_build_header(skb,
c69de58b 991 ntohl(tun_id),
94d7d8f2
WT		 992 ntohl(md->u.index), truncate,
993 false);
994 } else if (md->version == 2) {
94d7d8f2 995 erspan_build_header_v2(skb,
c69de58b
WT		 996 ntohl(tun_id),
997 md->u.md2.dir,
998 get_hwid(&md->u.md2),
999 truncate, false);
d6aa7119
WT		 1000 } else {
1001 goto tx_err;
94d7d8f2 1002 }
ef7baf5e
WT		 1003 } else {
1004 switch (skb->protocol) {
1005 case htons(ETH_P_IP):
1006 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1007 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1008 &dsfield, &encap_limit);
1009 break;
1010 case htons(ETH_P_IPV6):
cb9f1b78 1011 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
ef7baf5e
WT		 1012 goto tx_err;
1013 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1014 &dsfield, &encap_limit))
1015 goto tx_err;
1016 break;
1017 default:
1018 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1019 break;
1020 }
1021
94d7d8f2 1022 if (t->parms.erspan_ver == 1)
c69de58b 1023 erspan_build_header(skb, ntohl(t->parms.o_key),
94d7d8f2
WT		 1024 t->parms.index,
1025 truncate, false);
02f99df1 1026 else if (t->parms.erspan_ver == 2)
c69de58b 1027 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
94d7d8f2
WT		 1028 t->parms.dir,
1029 t->parms.hwid,
1030 truncate, false);
02f99df1
WT		 1031 else
1032 goto tx_err;
1033
ef7baf5e
WT		 1034 fl6.daddr = t->parms.raddr;
1035 }
5a963eb6
WT		 1036
1037 /* Push GRE header. */
1038 gre_build_header(skb, 8, TUNNEL_SEQ,
1039 htons(ETH_P_ERSPAN), 0, htonl(t->o_seqno++));
1040
1041 /* TooBig packet may have updated dst->dev's mtu */
ef7baf5e 1042 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
5a963eb6
WT		 1043 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu);
1044
1045 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1046 NEXTHDR_GRE);
1047 if (err != 0) {
1048 /* XXX: send ICMP error even if DF is not set. */
1049 if (err == -EMSGSIZE) {
1050 if (skb->protocol == htons(ETH_P_IP))
1051 icmp_send(skb, ICMP_DEST_UNREACH,
1052 ICMP_FRAG_NEEDED, htonl(mtu));
1053 else
1054 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1055 }
1056
1057 goto tx_err;
1058 }
1059 return NETDEV_TX_OK;
1060
1061tx_err:
1062 stats = &t->dev->stats;
1063 stats->tx_errors++;
1064 stats->tx_dropped++;
1065 kfree_skb(skb);
1066 return NETDEV_TX_OK;
1067}
1068
a483373e 1069static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
c12b395a 1070{
1071 struct net_device *dev = t->dev;
1072 struct __ip6_tnl_parm *p = &t->parms;
1073 struct flowi6 *fl6 = &t->fl.u.ip6;
c12b395a 1074
1075 if (dev->type != ARPHRD_ETHER) {
1076 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1077 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1078 }
1079
1080 /* Set up flowi template */
1081 fl6->saddr = p->laddr;
1082 fl6->daddr = p->raddr;
1083 fl6->flowi6_oif = p->link;
1084 fl6->flowlabel = 0;
252f3f5a 1085 fl6->flowi6_proto = IPPROTO_GRE;
c12b395a 1086
1087 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1088 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1089 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1090 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1091
1092 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1093 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1094
1095 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1096 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1097 dev->flags |= IFF_POINTOPOINT;
1098 else
1099 dev->flags &= ~IFF_POINTOPOINT;
a483373e 1100}
c12b395a 1101
a483373e
PM		 1102static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1103 int t_hlen)
1104{
1105 const struct __ip6_tnl_parm *p = &t->parms;
1106 struct net_device *dev = t->dev;
c12b395a 1107
1108 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1109 int strict = (ipv6_addr_type(&p->raddr) &
1110 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1111
22f08069 1112 struct rt6_info *rt = rt6_lookup(t->net,
c12b395a 1113 &p->raddr, &p->laddr,
b75cc8f9 1114 p->link, NULL, strict);
c12b395a 1115
63159f29 1116 if (!rt)
c12b395a 1117 return;
1118
1119 if (rt->dst.dev) {
eb95f52f 1120 dev->needed_headroom = rt->dst.dev->hard_header_len +
db2ec95d 1121 t_hlen;
c12b395a 1122
1123 if (set_mtu) {
db2ec95d 1124 dev->mtu = rt->dst.dev->mtu - t_hlen;
c12b395a 1125 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1126 dev->mtu -= 8;
a9e242ca
AD		 1127 if (dev->type == ARPHRD_ETHER)
1128 dev->mtu -= ETH_HLEN;
c12b395a 1129
1130 if (dev->mtu < IPV6_MIN_MTU)
1131 dev->mtu = IPV6_MIN_MTU;
1132 }
1133 }
94e187c0 1134 ip6_rt_put(rt);
c12b395a 1135 }
c12b395a 1136}
1137
a483373e
PM		 1138static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1139{
1140 int t_hlen;
1141
1142 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1143 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1144
1145 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
eb95f52f 1146 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
a483373e
PM		 1147 return t_hlen;
1148}
1149
1150static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1151{
1152 ip6gre_tnl_link_config_common(t);
1153 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1154}
1155
a6465350
PM		 1156static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1157 const struct __ip6_tnl_parm *p)
c12b395a 1158{
1159 t->parms.laddr = p->laddr;
1160 t->parms.raddr = p->raddr;
1161 t->parms.flags = p->flags;
1162 t->parms.hop_limit = p->hop_limit;
1163 t->parms.encap_limit = p->encap_limit;
1164 t->parms.flowinfo = p->flowinfo;
1165 t->parms.link = p->link;
1166 t->parms.proto = p->proto;
1167 t->parms.i_key = p->i_key;
1168 t->parms.o_key = p->o_key;
1169 t->parms.i_flags = p->i_flags;
1170 t->parms.o_flags = p->o_flags;
0a473b82 1171 t->parms.fwmark = p->fwmark;
607f725f 1172 dst_cache_reset(&t->dst_cache);
a6465350
PM		 1173}
1174
1175static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1176 int set_mtu)
1177{
1178 ip6gre_tnl_copy_tnl_parm(t, p);
c12b395a 1179 ip6gre_tnl_link_config(t, set_mtu);
1180 return 0;
1181}
1182
1183static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1184 const struct ip6_tnl_parm2 *u)
1185{
1186 p->laddr = u->laddr;
1187 p->raddr = u->raddr;
1188 p->flags = u->flags;
1189 p->hop_limit = u->hop_limit;
1190 p->encap_limit = u->encap_limit;
1191 p->flowinfo = u->flowinfo;
1192 p->link = u->link;
1193 p->i_key = u->i_key;
1194 p->o_key = u->o_key;
f41fe3c2
TH		 1195 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1196 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
c12b395a 1197 memcpy(p->name, u->name, sizeof(u->name));
1198}
1199
1200static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1201 const struct __ip6_tnl_parm *p)
1202{
1203 u->proto = IPPROTO_GRE;
1204 u->laddr = p->laddr;
1205 u->raddr = p->raddr;
1206 u->flags = p->flags;
1207 u->hop_limit = p->hop_limit;
1208 u->encap_limit = p->encap_limit;
1209 u->flowinfo = p->flowinfo;
1210 u->link = p->link;
1211 u->i_key = p->i_key;
1212 u->o_key = p->o_key;
f41fe3c2
TH		 1213 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1214 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
c12b395a 1215 memcpy(u->name, p->name, sizeof(u->name));
1216}
1217
1218static int ip6gre_tunnel_ioctl(struct net_device *dev,
1219 struct ifreq *ifr, int cmd)
1220{
1221 int err = 0;
1222 struct ip6_tnl_parm2 p;
1223 struct __ip6_tnl_parm p1;
22f08069
ND		 1224 struct ip6_tnl *t = netdev_priv(dev);
1225 struct net *net = t->net;
c12b395a 1226 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1227
308edfdf
TH		 1228 memset(&p1, 0, sizeof(p1));
1229
c12b395a 1230 switch (cmd) {
1231 case SIOCGETTUNNEL:
c12b395a 1232 if (dev == ign->fb_tunnel_dev) {
1233 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1234 err = -EFAULT;
1235 break;
1236 }
1237 ip6gre_tnl_parm_from_user(&p1, &p);
1238 t = ip6gre_tunnel_locate(net, &p1, 0);
63159f29 1239 if (!t)
22f08069 1240 t = netdev_priv(dev);
c12b395a 1241 }
5dbd5068 1242 memset(&p, 0, sizeof(p));
c12b395a 1243 ip6gre_tnl_parm_to_user(&p, &t->parms);
1244 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1245 err = -EFAULT;
1246 break;
1247
1248 case SIOCADDTUNNEL:
1249 case SIOCCHGTUNNEL:
1250 err = -EPERM;
af31f412 1251 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
c12b395a 1252 goto done;
1253
1254 err = -EFAULT;
1255 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1256 goto done;
1257
1258 err = -EINVAL;
1259 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1260 goto done;
1261
1262 if (!(p.i_flags&GRE_KEY))
1263 p.i_key = 0;
1264 if (!(p.o_flags&GRE_KEY))
1265 p.o_key = 0;
1266
1267 ip6gre_tnl_parm_from_user(&p1, &p);
1268 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1269
1270 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
53b24b8f 1271 if (t) {
c12b395a 1272 if (t->dev != dev) {
1273 err = -EEXIST;
1274 break;
1275 }
1276 } else {
1277 t = netdev_priv(dev);
1278
1279 ip6gre_tunnel_unlink(ign, t);
1280 synchronize_net();
1281 ip6gre_tnl_change(t, &p1, 1);
1282 ip6gre_tunnel_link(ign, t);
1283 netdev_state_change(dev);
1284 }
1285 }
1286
1287 if (t) {
1288 err = 0;
1289
5dbd5068 1290 memset(&p, 0, sizeof(p));
c12b395a 1291 ip6gre_tnl_parm_to_user(&p, &t->parms);
1292 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1293 err = -EFAULT;
1294 } else
1295 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1296 break;
1297
1298 case SIOCDELTUNNEL:
1299 err = -EPERM;
af31f412 1300 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
c12b395a 1301 goto done;
1302
1303 if (dev == ign->fb_tunnel_dev) {
1304 err = -EFAULT;
1305 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1306 goto done;
1307 err = -ENOENT;
1308 ip6gre_tnl_parm_from_user(&p1, &p);
1309 t = ip6gre_tunnel_locate(net, &p1, 0);
63159f29 1310 if (!t)
c12b395a 1311 goto done;
1312 err = -EPERM;
1313 if (t == netdev_priv(ign->fb_tunnel_dev))
1314 goto done;
1315 dev = t->dev;
1316 }
1317 unregister_netdevice(dev);
1318 err = 0;
1319 break;
1320
1321 default:
1322 err = -EINVAL;
1323 }
1324
1325done:
1326 return err;
1327}
1328
c12b395a 1329static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
76cc0d32
XL		 1330 unsigned short type, const void *daddr,
1331 const void *saddr, unsigned int len)
c12b395a 1332{
1333 struct ip6_tnl *t = netdev_priv(dev);
76cc0d32
XL		 1334 struct ipv6hdr *ipv6h;
1335 __be16 *p;
c12b395a 1336
76cc0d32
XL		 1337 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1338 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1339 t->fl.u.ip6.flowlabel,
1340 true, &t->fl.u.ip6));
c12b395a 1341 ipv6h->hop_limit = t->parms.hop_limit;
1342 ipv6h->nexthdr = NEXTHDR_GRE;
1343 ipv6h->saddr = t->parms.laddr;
1344 ipv6h->daddr = t->parms.raddr;
1345
76cc0d32
XL		 1346 p = (__be16 *)(ipv6h + 1);
1347 p[0] = t->parms.o_flags;
1348 p[1] = htons(type);
c12b395a 1349
1350 /*
1351 * Set the source hardware address.
1352 */
1353
1354 if (saddr)
1355 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1356 if (daddr)
1357 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1358 if (!ipv6_addr_any(&ipv6h->daddr))
1359 return t->hlen;
1360
1361 return -t->hlen;
1362}
1363
c12b395a 1364static const struct header_ops ip6gre_header_ops = {
1365 .create = ip6gre_header,
c12b395a 1366};
1367
1368static const struct net_device_ops ip6gre_netdev_ops = {
1369 .ndo_init = ip6gre_tunnel_init,
1370 .ndo_uninit = ip6gre_tunnel_uninit,
1371 .ndo_start_xmit = ip6gre_tunnel_xmit,
1372 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
b05229f4 1373 .ndo_change_mtu = ip6_tnl_change_mtu,
f61dd388 1374 .ndo_get_stats64 = ip_tunnel_get_stats64,
ecf2c06a 1375 .ndo_get_iflink = ip6_tnl_get_iflink,
c12b395a 1376};
1377
1378static void ip6gre_dev_free(struct net_device *dev)
1379{
cdf3464e
MKL		 1380 struct ip6_tnl *t = netdev_priv(dev);
1381
0c1dd2a1 1382 gro_cells_destroy(&t->gro_cells);
607f725f 1383 dst_cache_destroy(&t->dst_cache);
c12b395a 1384 free_percpu(dev->tstats);
c12b395a 1385}
1386
1387static void ip6gre_tunnel_setup(struct net_device *dev)
1388{
c12b395a 1389 dev->netdev_ops = &ip6gre_netdev_ops;
cf124db5
DM		 1390 dev->needs_free_netdev = true;
1391 dev->priv_destructor = ip6gre_dev_free;
c12b395a 1392
1393 dev->type = ARPHRD_IP6GRE;
b05229f4 1394
c12b395a 1395 dev->flags |= IFF_NOARP;
c12b395a 1396 dev->addr_len = sizeof(struct in6_addr);
02875878 1397 netif_keep_dst(dev);
45ce0fd1
FJ		 1398 /* This perm addr will be used as interface identifier by IPv6 */
1399 dev->addr_assign_type = NET_ADDR_RANDOM;
1400 eth_random_addr(dev->perm_addr);
c12b395a 1401}
1402
e5a9336a
AK		 1403#define GRE6_FEATURES (NETIF_F_SG | \
1404 NETIF_F_FRAGLIST | \
1405 NETIF_F_HIGHDMA | \
1406 NETIF_F_HW_CSUM)
1407
1408static void ip6gre_tnl_init_features(struct net_device *dev)
1409{
1410 struct ip6_tnl *nt = netdev_priv(dev);
1411
1412 dev->features |= GRE6_FEATURES;
1413 dev->hw_features |= GRE6_FEATURES;
1414
1415 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1416 /* TCP offload with GRE SEQ is not supported, nor
1417 * can we support 2 levels of outer headers requiring
1418 * an update.
1419 */
1420 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1421 nt->encap.type == TUNNEL_ENCAP_NONE) {
1422 dev->features |= NETIF_F_GSO_SOFTWARE;
1423 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1424 }
1425
1426 /* Can use a lockless transmit, unless we generate
1427 * output sequences
1428 */
1429 dev->features |= NETIF_F_LLTX;
1430 }
1431}
1432
a3c119d3 1433static int ip6gre_tunnel_init_common(struct net_device *dev)
c12b395a 1434{
1435 struct ip6_tnl *tunnel;
cdf3464e 1436 int ret;
b05229f4 1437 int t_hlen;
c12b395a 1438
1439 tunnel = netdev_priv(dev);
1440
1441 tunnel->dev = dev;
0bd87628 1442 tunnel->net = dev_net(dev);
c12b395a 1443 strcpy(tunnel->parms.name, dev->name);
1444
a3c119d3
MKL		 1445 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1446 if (!dev->tstats)
1447 return -ENOMEM;
1448
607f725f 1449 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
0c1dd2a1
EBE		 1450 if (ret)
1451 goto cleanup_alloc_pcpu_stats;
1452
1453 ret = gro_cells_init(&tunnel->gro_cells, dev);
1454 if (ret)
1455 goto cleanup_dst_cache_init;
cdf3464e 1456
a483373e 1457 t_hlen = ip6gre_calc_hlen(tunnel);
db2ec95d 1458 dev->mtu = ETH_DATA_LEN - t_hlen;
1b227e53
HY		 1459 if (dev->type == ARPHRD_ETHER)
1460 dev->mtu -= ETH_HLEN;
b05229f4
TH		 1461 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1462 dev->mtu -= 8;
1463
6712abc1
WT		 1464 if (tunnel->parms.collect_md) {
1465 dev->features |= NETIF_F_NETNS_LOCAL;
1466 netif_keep_dst(dev);
1467 }
e5a9336a 1468 ip6gre_tnl_init_features(dev);
6712abc1 1469
a3c119d3 1470 return 0;
0c1dd2a1
EBE		 1471
1472cleanup_dst_cache_init:
1473 dst_cache_destroy(&tunnel->dst_cache);
1474cleanup_alloc_pcpu_stats:
1475 free_percpu(dev->tstats);
1476 dev->tstats = NULL;
1477 return ret;
a3c119d3
MKL		 1478}
1479
1480static int ip6gre_tunnel_init(struct net_device *dev)
1481{
1482 struct ip6_tnl *tunnel;
1483 int ret;
1484
1485 ret = ip6gre_tunnel_init_common(dev);
1486 if (ret)
1487 return ret;
1488
1489 tunnel = netdev_priv(dev);
1490
6712abc1
WT		 1491 if (tunnel->parms.collect_md)
1492 return 0;
1493
c12b395a 1494 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1495 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1496
1497 if (ipv6_addr_any(&tunnel->parms.raddr))
1498 dev->header_ops = &ip6gre_header_ops;
1499
c12b395a 1500 return 0;
1501}
1502
1503static void ip6gre_fb_tunnel_init(struct net_device *dev)
1504{
1505 struct ip6_tnl *tunnel = netdev_priv(dev);
1506
1507 tunnel->dev = dev;
0bd87628 1508 tunnel->net = dev_net(dev);
c12b395a 1509 strcpy(tunnel->parms.name, dev->name);
1510
1511 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1512
1513 dev_hold(dev);
1514}
1515
c12b395a 1516static struct inet6_protocol ip6gre_protocol __read_mostly = {
308edfdf 1517 .handler = gre_rcv,
c12b395a 1518 .err_handler = ip6gre_err,
1519 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1520};
1521
22f08069 1522static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
c12b395a 1523{
22f08069
ND		 1524 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1525 struct net_device *dev, *aux;
c12b395a 1526 int prio;
1527
22f08069
ND		 1528 for_each_netdev_safe(net, dev, aux)
1529 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
5a963eb6
WT		 1530 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1531 dev->rtnl_link_ops == &ip6erspan_tap_ops)
22f08069
ND		 1532 unregister_netdevice_queue(dev, head);
1533
c12b395a 1534 for (prio = 0; prio < 4; prio++) {
1535 int h;
e87a8f24 1536 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
c12b395a 1537 struct ip6_tnl *t;
1538
1539 t = rtnl_dereference(ign->tunnels[prio][h]);
1540
53b24b8f 1541 while (t) {
22f08069
ND		 1542 /* If dev is in the same netns, it has already
1543 * been added to the list by the previous loop.
1544 */
1545 if (!net_eq(dev_net(t->dev), net))
1546 unregister_netdevice_queue(t->dev,
1547 head);
c12b395a 1548 t = rtnl_dereference(t->next);
1549 }
1550 }
1551 }
1552}
1553
1554static int __net_init ip6gre_init_net(struct net *net)
1555{
1556 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1557 int err;
1558
79134e6c
ED		 1559 if (!net_has_fallback_tunnels(net))
1560 return 0;
c12b395a 1561 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
c835a677
TG		 1562 NET_NAME_UNKNOWN,
1563 ip6gre_tunnel_setup);
c12b395a 1564 if (!ign->fb_tunnel_dev) {
1565 err = -ENOMEM;
1566 goto err_alloc_dev;
1567 }
1568 dev_net_set(ign->fb_tunnel_dev, net);
22f08069
ND		 1569 /* FB netdevice is special: we have one, and only one per netns.
1570 * Allowing to move it to another netns is clearly unsafe.
1571 */
1572 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1573
c12b395a 1574
1575 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1576 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1577
1578 err = register_netdev(ign->fb_tunnel_dev);
1579 if (err)
1580 goto err_reg_dev;
1581
1582 rcu_assign_pointer(ign->tunnels_wc[0],
1583 netdev_priv(ign->fb_tunnel_dev));
1584 return 0;
1585
1586err_reg_dev:
cf124db5 1587 free_netdev(ign->fb_tunnel_dev);
c12b395a 1588err_alloc_dev:
1589 return err;
1590}
1591
bb401cae 1592static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
c12b395a 1593{
bb401cae 1594 struct net *net;
c12b395a 1595 LIST_HEAD(list);
1596
c12b395a 1597 rtnl_lock();
bb401cae
ED		 1598 list_for_each_entry(net, net_list, exit_list)
1599 ip6gre_destroy_tunnels(net, &list);
c12b395a 1600 unregister_netdevice_many(&list);
1601 rtnl_unlock();
1602}
1603
1604static struct pernet_operations ip6gre_net_ops = {
1605 .init = ip6gre_init_net,
bb401cae 1606 .exit_batch = ip6gre_exit_batch_net,
c12b395a 1607 .id = &ip6gre_net_id,
1608 .size = sizeof(struct ip6gre_net),
1609};
1610
a8b8a889
MS		 1611static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1612 struct netlink_ext_ack *extack)
c12b395a 1613{
1614 __be16 flags;
1615
1616 if (!data)
1617 return 0;
1618
1619 flags = 0;
1620 if (data[IFLA_GRE_IFLAGS])
1621 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1622 if (data[IFLA_GRE_OFLAGS])
1623 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1624 if (flags & (GRE_VERSION|GRE_ROUTING))
1625 return -EINVAL;
1626
1627 return 0;
1628}
1629
a8b8a889
MS		 1630static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1631 struct netlink_ext_ack *extack)
c12b395a 1632{
1633 struct in6_addr daddr;
1634
1635 if (tb[IFLA_ADDRESS]) {
1636 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1637 return -EINVAL;
1638 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1639 return -EADDRNOTAVAIL;
1640 }
1641
1642 if (!data)
1643 goto out;
1644
1645 if (data[IFLA_GRE_REMOTE]) {
67b61f6c 1646 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
c12b395a 1647 if (ipv6_addr_any(&daddr))
1648 return -EINVAL;
1649 }
1650
1651out:
a8b8a889 1652 return ip6gre_tunnel_validate(tb, data, extack);
c12b395a 1653}
1654
5a963eb6
WT		 1655static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1656 struct netlink_ext_ack *extack)
1657{
1658 __be16 flags = 0;
94d7d8f2 1659 int ret, ver = 0;
5a963eb6
WT		 1660
1661 if (!data)
1662 return 0;
1663
1664 ret = ip6gre_tap_validate(tb, data, extack);
1665 if (ret)
1666 return ret;
1667
1668 /* ERSPAN should only have GRE sequence and key flag */
1669 if (data[IFLA_GRE_OFLAGS])
1670 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1671 if (data[IFLA_GRE_IFLAGS])
1672 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1673 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1674 flags != (GRE_SEQ | GRE_KEY))
1675 return -EINVAL;
1676
1677 /* ERSPAN Session ID only has 10-bit. Since we reuse
1678 * 32-bit key field as ID, check it's range.
1679 */
1680 if (data[IFLA_GRE_IKEY] &&
1681 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1682 return -EINVAL;
1683
1684 if (data[IFLA_GRE_OKEY] &&
1685 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1686 return -EINVAL;
1687
94d7d8f2
WT		 1688 if (data[IFLA_GRE_ERSPAN_VER]) {
1689 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1690 if (ver != 1 && ver != 2)
5a963eb6
WT		 1691 return -EINVAL;
1692 }
94d7d8f2
WT		 1693
1694 if (ver == 1) {
1695 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1696 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1697
1698 if (index & ~INDEX_MASK)
1699 return -EINVAL;
1700 }
1701 } else if (ver == 2) {
1702 if (data[IFLA_GRE_ERSPAN_DIR]) {
1703 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1704
1705 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1706 return -EINVAL;
1707 }
1708
1709 if (data[IFLA_GRE_ERSPAN_HWID]) {
1710 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1711
1712 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1713 return -EINVAL;
1714 }
1715 }
1716
5a963eb6
WT		 1717 return 0;
1718}
c12b395a 1719
1720static void ip6gre_netlink_parms(struct nlattr *data[],
1721 struct __ip6_tnl_parm *parms)
1722{
1723 memset(parms, 0, sizeof(*parms));
1724
1725 if (!data)
1726 return;
1727
1728 if (data[IFLA_GRE_LINK])
1729 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1730
1731 if (data[IFLA_GRE_IFLAGS])
f41fe3c2
TH		 1732 parms->i_flags = gre_flags_to_tnl_flags(
1733 nla_get_be16(data[IFLA_GRE_IFLAGS]));
c12b395a 1734
1735 if (data[IFLA_GRE_OFLAGS])
f41fe3c2
TH		 1736 parms->o_flags = gre_flags_to_tnl_flags(
1737 nla_get_be16(data[IFLA_GRE_OFLAGS]));
c12b395a 1738
1739 if (data[IFLA_GRE_IKEY])
1740 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1741
1742 if (data[IFLA_GRE_OKEY])
1743 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1744
1745 if (data[IFLA_GRE_LOCAL])
67b61f6c 1746 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
c12b395a 1747
1748 if (data[IFLA_GRE_REMOTE])
67b61f6c 1749 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
c12b395a 1750
1751 if (data[IFLA_GRE_TTL])
1752 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1753
1754 if (data[IFLA_GRE_ENCAP_LIMIT])
1755 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1756
1757 if (data[IFLA_GRE_FLOWINFO])
c2675de4 1758 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
c12b395a 1759
1760 if (data[IFLA_GRE_FLAGS])
1761 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
0a473b82
CG		 1762
1763 if (data[IFLA_GRE_FWMARK])
1764 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
5a963eb6 1765
6712abc1
WT		 1766 if (data[IFLA_GRE_COLLECT_METADATA])
1767 parms->collect_md = true;
94d7d8f2 1768
84581bda 1769 parms->erspan_ver = 1;
94d7d8f2
WT		 1770 if (data[IFLA_GRE_ERSPAN_VER])
1771 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1772
1773 if (parms->erspan_ver == 1) {
1774 if (data[IFLA_GRE_ERSPAN_INDEX])
1775 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1776 } else if (parms->erspan_ver == 2) {
1777 if (data[IFLA_GRE_ERSPAN_DIR])
1778 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1779 if (data[IFLA_GRE_ERSPAN_HWID])
1780 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1781 }
c12b395a 1782}
1783
1784static int ip6gre_tap_init(struct net_device *dev)
1785{
a3c119d3 1786 int ret;
c12b395a 1787
a3c119d3
MKL		 1788 ret = ip6gre_tunnel_init_common(dev);
1789 if (ret)
1790 return ret;
c12b395a 1791
0a46baaf
SC		 1792 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1793
c12b395a 1794 return 0;
1795}
1796
1797static const struct net_device_ops ip6gre_tap_netdev_ops = {
1798 .ndo_init = ip6gre_tap_init,
1799 .ndo_uninit = ip6gre_tunnel_uninit,
1800 .ndo_start_xmit = ip6gre_tunnel_xmit,
1801 .ndo_set_mac_address = eth_mac_addr,
1802 .ndo_validate_addr = eth_validate_addr,
b05229f4 1803 .ndo_change_mtu = ip6_tnl_change_mtu,
f61dd388 1804 .ndo_get_stats64 = ip_tunnel_get_stats64,
ecf2c06a 1805 .ndo_get_iflink = ip6_tnl_get_iflink,
c12b395a 1806};
1807
2d665034
PM		 1808static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1809{
1810 int t_hlen;
1811
1812 tunnel->tun_hlen = 8;
1813 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1814 erspan_hdr_len(tunnel->parms.erspan_ver);
1815
1816 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
eb95f52f 1817 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
2d665034
PM		 1818 return t_hlen;
1819}
1820
5a963eb6
WT		 1821static int ip6erspan_tap_init(struct net_device *dev)
1822{
1823 struct ip6_tnl *tunnel;
1824 int t_hlen;
1825 int ret;
1826
1827 tunnel = netdev_priv(dev);
1828
1829 tunnel->dev = dev;
1830 tunnel->net = dev_net(dev);
1831 strcpy(tunnel->parms.name, dev->name);
1832
1833 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1834 if (!dev->tstats)
1835 return -ENOMEM;
1836
1837 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
0c1dd2a1
EBE		 1838 if (ret)
1839 goto cleanup_alloc_pcpu_stats;
1840
1841 ret = gro_cells_init(&tunnel->gro_cells, dev);
1842 if (ret)
1843 goto cleanup_dst_cache_init;
5a963eb6 1844
2d665034 1845 t_hlen = ip6erspan_calc_hlen(tunnel);
5a963eb6
WT		 1846 dev->mtu = ETH_DATA_LEN - t_hlen;
1847 if (dev->type == ARPHRD_ETHER)
1848 dev->mtu -= ETH_HLEN;
1849 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1850 dev->mtu -= 8;
1851
1852 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2d665034 1853 ip6erspan_tnl_link_config(tunnel, 1);
5a963eb6
WT		 1854
1855 return 0;
0c1dd2a1
EBE		 1856
1857cleanup_dst_cache_init:
1858 dst_cache_destroy(&tunnel->dst_cache);
1859cleanup_alloc_pcpu_stats:
1860 free_percpu(dev->tstats);
1861 dev->tstats = NULL;
1862 return ret;
5a963eb6
WT		 1863}
1864
1865static const struct net_device_ops ip6erspan_netdev_ops = {
1866 .ndo_init = ip6erspan_tap_init,
b80d0b93 1867 .ndo_uninit = ip6erspan_tunnel_uninit,
5a963eb6
WT		 1868 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1869 .ndo_set_mac_address = eth_mac_addr,
1870 .ndo_validate_addr = eth_validate_addr,
1871 .ndo_change_mtu = ip6_tnl_change_mtu,
1872 .ndo_get_stats64 = ip_tunnel_get_stats64,
1873 .ndo_get_iflink = ip6_tnl_get_iflink,
1874};
1875
c12b395a 1876static void ip6gre_tap_setup(struct net_device *dev)
1877{
1878
1879 ether_setup(dev);
1880
2c52129a 1881 dev->max_mtu = 0;
c12b395a 1882 dev->netdev_ops = &ip6gre_tap_netdev_ops;
cf124db5
DM		 1883 dev->needs_free_netdev = true;
1884 dev->priv_destructor = ip6gre_dev_free;
c12b395a 1885
c12b395a 1886 dev->features |= NETIF_F_NETNS_LOCAL;
d13b161c 1887 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
0a46baaf 1888 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2d40557c 1889 netif_keep_dst(dev);
c12b395a 1890}
1891
1faf3d9f
TH		 1892static 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
7fa38a7c
PM		 1925static 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)
c12b395a 1928{
1929 struct ip6_tnl *nt;
1faf3d9f 1930 struct ip_tunnel_encap ipencap;
c12b395a 1931 int err;
1932
1933 nt = netdev_priv(dev);
1faf3d9f
TH		 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
c12b395a 1942 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1943 eth_hw_addr_random(dev);
1944
1945 nt->dev = dev;
0bd87628 1946 nt->net = dev_net(dev);
c12b395a 1947
c12b395a 1948 err = register_netdevice(dev);
1949 if (err)
1950 goto out;
1951
128bb975
AK		 1952 if (tb[IFLA_MTU])
1953 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1954
c12b395a 1955 dev_hold(dev);
c12b395a 1956
1957out:
1958 return err;
1959}
1960
7fa38a7c
PM		 1961static 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{
7fa38a7c
PM		 1965 struct ip6_tnl *nt = netdev_priv(dev);
1966 struct net *net = dev_net(dev);
b80d0b93
WT		 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 }
7fa38a7c 1980
b80d0b93 1981 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
7fa38a7c
PM		 1982 if (!err) {
1983 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
b80d0b93 1984 ip6gre_tunnel_link_md(ign, nt);
7fa38a7c
PM		 1985 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
1986 }
1987 return err;
1988}
1989
c8632fc3
PM		 1990static struct ip6_tnl *
1991ip6gre_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)
c12b395a 1994{
22f08069
ND		 1995 struct ip6_tnl *t, *nt = netdev_priv(dev);
1996 struct net *net = nt->net;
c12b395a 1997 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1faf3d9f 1998 struct ip_tunnel_encap ipencap;
c12b395a 1999
2000 if (dev == ign->fb_tunnel_dev)
c8632fc3 2001 return ERR_PTR(-EINVAL);
c12b395a 2002
1faf3d9f
TH		 2003 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2004 int err = ip6_tnl_encap_setup(nt, &ipencap);
2005
2006 if (err < 0)
c8632fc3 2007 return ERR_PTR(err);
1faf3d9f
TH		 2008 }
2009
c8632fc3 2010 ip6gre_netlink_parms(data, p_p);
c12b395a 2011
c8632fc3 2012 t = ip6gre_tunnel_locate(net, p_p, 0);
c12b395a 2013
2014 if (t) {
2015 if (t->dev != dev)
c8632fc3 2016 return ERR_PTR(-EEXIST);
c12b395a 2017 } else {
2018 t = nt;
c12b395a 2019 }
2020
c8632fc3
PM		 2021 return t;
2022}
2023
2024static 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
b80d0b93 2036 ip6gre_tunnel_unlink_md(ign, t);
6a61d4db
ND		 2037 ip6gre_tunnel_unlink(ign, t);
2038 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
b80d0b93 2039 ip6gre_tunnel_link_md(ign, t);
6a61d4db 2040 ip6gre_tunnel_link(ign, t);
c12b395a 2041 return 0;
2042}
2043
54d63f78
ND		 2044static 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
c12b395a 2053static 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 */
a3754133 2067 nla_total_size(sizeof(struct in6_addr)) +
c12b395a 2068 /* IFLA_GRE_REMOTE */
a3754133 2069 nla_total_size(sizeof(struct in6_addr)) +
c12b395a 2070 /* IFLA_GRE_TTL */
2071 nla_total_size(1) +
c12b395a 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) +
1faf3d9f
TH		 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) +
6712abc1
WT		 2086 /* IFLA_GRE_COLLECT_METADATA */
2087 nla_total_size(0) +
0a473b82
CG		 2088 /* IFLA_GRE_FWMARK */
2089 nla_total_size(4) +
5a963eb6
WT		 2090 /* IFLA_GRE_ERSPAN_INDEX */
2091 nla_total_size(4) +
c12b395a 2092 0;
2093}
2094
2095static 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) ||
f41fe3c2
TH		 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)) ||
c12b395a 2105 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2106 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
930345ea
JB		 2107 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2108 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
c12b395a 2109 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
c12b395a 2110 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2111 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
0a473b82 2112 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
5a963eb6
WT		 2113 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark) ||
2114 nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
c12b395a 2115 goto nla_put_failure;
1faf3d9f
TH		 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
6712abc1
WT		 2127 if (p->collect_md) {
2128 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2129 goto nla_put_failure;
2130 }
2131
94d7d8f2
WT		 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
c12b395a 2145 return 0;
2146
2147nla_put_failure:
2148 return -EMSGSIZE;
2149}
2150
2151static 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 },
1faf3d9f
TH		 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 },
6712abc1 2167 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
0a473b82 2168 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
5a963eb6 2169 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
94d7d8f2
WT		 2170 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2171 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2172 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
c12b395a 2173};
2174
5a963eb6
WT		 2175static 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
2d665034
PM		 2189static 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{
2d665034
PM		 2193 struct ip6_tnl *nt = netdev_priv(dev);
2194 struct net *net = dev_net(dev);
b80d0b93
WT		 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 }
2d665034 2208
b80d0b93 2209 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2d665034
PM		 2210 if (!err) {
2211 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
b80d0b93 2212 ip6erspan_tunnel_link_md(ign, nt);
2d665034
PM		 2213 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2214 }
2215 return err;
2216}
2217
2218static 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
2224static 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
2232static 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
b80d0b93 2244 ip6gre_tunnel_unlink_md(ign, t);
2d665034
PM		 2245 ip6gre_tunnel_unlink(ign, t);
2246 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
b80d0b93 2247 ip6erspan_tunnel_link_md(ign, t);
2d665034
PM		 2248 ip6gre_tunnel_link(ign, t);
2249 return 0;
2250}
2251
c12b395a 2252static 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,
54d63f78 2261 .dellink = ip6gre_dellink,
c12b395a 2262 .get_size = ip6gre_get_size,
2263 .fill_info = ip6gre_fill_info,
1728d4fa 2264 .get_link_net = ip6_tnl_get_link_net,
c12b395a 2265};
2266
2267static 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,
3390e397 2278 .get_link_net = ip6_tnl_get_link_net,
c12b395a 2279};
2280
5a963eb6
WT		 2281static 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,
2d665034
PM		 2288 .newlink = ip6erspan_newlink,
2289 .changelink = ip6erspan_changelink,
5a963eb6
WT		 2290 .get_size = ip6gre_get_size,
2291 .fill_info = ip6gre_fill_info,
2292 .get_link_net = ip6_tnl_get_link_net,
2293};
2294
c12b395a 2295/*
2296 * And now the modules code and kernel interface.
2297 */
2298
2299static 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
5a963eb6
WT		 2323 err = rtnl_link_register(&ip6erspan_tap_ops);
2324 if (err < 0)
2325 goto erspan_link_failed;
2326
c12b395a 2327out:
2328 return err;
2329
5a963eb6
WT		 2330erspan_link_failed:
2331 rtnl_link_unregister(&ip6gre_tap_ops);
c12b395a 2332tap_ops_failed:
2333 rtnl_link_unregister(&ip6gre_link_ops);
2334rtnl_link_failed:
2335 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2336add_proto_failed:
2337 unregister_pernet_device(&ip6gre_net_ops);
2338 goto out;
2339}
2340
2341static void __exit ip6gre_fini(void)
2342{
2343 rtnl_link_unregister(&ip6gre_tap_ops);
2344 rtnl_link_unregister(&ip6gre_link_ops);
5a963eb6 2345 rtnl_link_unregister(&ip6erspan_tap_ops);
c12b395a 2346 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2347 unregister_pernet_device(&ip6gre_net_ops);
2348}
2349
2350module_init(ip6gre_init);
2351module_exit(ip6gre_fini);
2352MODULE_LICENSE("GPL");
2353MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2354MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2355MODULE_ALIAS_RTNL_LINK("ip6gre");
5a4ee9a9 2356MODULE_ALIAS_RTNL_LINK("ip6gretap");
94d7d8f2 2357MODULE_ALIAS_RTNL_LINK("ip6erspan");
c12b395a 2358MODULE_ALIAS_NETDEV("ip6gre0");
Linux 6.x block layer and io_uring tree(s)