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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
[linux.git] / net / ipv6 / ip6_gre.c
CommitLineData
2874c5fd 1// SPDX-License-Identifier: GPL-2.0-or-later
c12b395a 2/*
3 * GRE over IPv6 protocol decoder.
4 *
5 * Authors: Dmitry Kozlov ([email protected])
c12b395a 6 */
7
8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10#include <linux/capability.h>
11#include <linux/module.h>
12#include <linux/types.h>
13#include <linux/kernel.h>
14#include <linux/slab.h>
15#include <linux/uaccess.h>
16#include <linux/skbuff.h>
17#include <linux/netdevice.h>
18#include <linux/in.h>
19#include <linux/tcp.h>
20#include <linux/udp.h>
21#include <linux/if_arp.h>
c12b395a 22#include <linux/init.h>
23#include <linux/in6.h>
24#include <linux/inetdevice.h>
25#include <linux/igmp.h>
26#include <linux/netfilter_ipv4.h>
27#include <linux/etherdevice.h>
28#include <linux/if_ether.h>
29#include <linux/hash.h>
30#include <linux/if_tunnel.h>
31#include <linux/ip6_tunnel.h>
32
33#include <net/sock.h>
34#include <net/ip.h>
c5441932 35#include <net/ip_tunnels.h>
c12b395a 36#include <net/icmp.h>
37#include <net/protocol.h>
38#include <net/addrconf.h>
39#include <net/arp.h>
40#include <net/checksum.h>
41#include <net/dsfield.h>
42#include <net/inet_ecn.h>
43#include <net/xfrm.h>
44#include <net/net_namespace.h>
45#include <net/netns/generic.h>
46#include <net/rtnetlink.h>
47
48#include <net/ipv6.h>
49#include <net/ip6_fib.h>
50#include <net/ip6_route.h>
51#include <net/ip6_tunnel.h>
308edfdf 52#include <net/gre.h>
5a963eb6 53#include <net/erspan.h>
6712abc1 54#include <net/dst_metadata.h>
c12b395a 55
56
eccc1bb8 57static bool log_ecn_error = true;
58module_param(log_ecn_error, bool, 0644);
59MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
60
e87a8f24
JK		 61#define IP6_GRE_HASH_SIZE_SHIFT 5
62#define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
c12b395a 63
c7d03a00 64static unsigned int ip6gre_net_id __read_mostly;
c12b395a 65struct ip6gre_net {
e87a8f24 66 struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
c12b395a 67
6712abc1 68 struct ip6_tnl __rcu *collect_md_tun;
b80d0b93 69 struct ip6_tnl __rcu *collect_md_tun_erspan;
c12b395a 70 struct net_device *fb_tunnel_dev;
71};
72
73static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
22f08069 74static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
5a963eb6 75static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly;
c12b395a 76static int ip6gre_tunnel_init(struct net_device *dev);
77static void ip6gre_tunnel_setup(struct net_device *dev);
78static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
79static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
2d665034 80static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu);
c12b395a 81
82/* Tunnel hash table */
83
84/*
85 4 hash tables:
86
87 3: (remote,local)
88 2: (remote,*)
89 1: (*,local)
90 0: (*,*)
91
92 We require exact key match i.e. if a key is present in packet
93 it will match only tunnel with the same key; if it is not present,
94 it will match only keyless tunnel.
95
96 All keysless packets, if not matched configured keyless tunnels
97 will match fallback tunnel.
98 */
99
e87a8f24 100#define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
c12b395a 101static u32 HASH_ADDR(const struct in6_addr *addr)
102{
103 u32 hash = ipv6_addr_hash(addr);
104
e87a8f24 105 return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
c12b395a 106}
107
108#define tunnels_r_l tunnels[3]
109#define tunnels_r tunnels[2]
110#define tunnels_l tunnels[1]
111#define tunnels_wc tunnels[0]
c12b395a 112
c12b395a 113/* Given src, dst and key, find appropriate for input tunnel. */
114
115static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
116 const struct in6_addr *remote, const struct in6_addr *local,
117 __be32 key, __be16 gre_proto)
118{
119 struct net *net = dev_net(dev);
120 int link = dev->ifindex;
121 unsigned int h0 = HASH_ADDR(remote);
122 unsigned int h1 = HASH_KEY(key);
123 struct ip6_tnl *t, *cand = NULL;
124 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
5a963eb6 125 int dev_type = (gre_proto == htons(ETH_P_TEB) ||
3b04caab
WT		 126 gre_proto == htons(ETH_P_ERSPAN) ||
127 gre_proto == htons(ETH_P_ERSPAN2)) ?
c12b395a 128 ARPHRD_ETHER : ARPHRD_IP6GRE;
129 int score, cand_score = 4;
130
e086cadc 131 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
c12b395a 132 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
133 !ipv6_addr_equal(remote, &t->parms.raddr) ||
134 key != t->parms.i_key ||
135 !(t->dev->flags & IFF_UP))
136 continue;
137
138 if (t->dev->type != ARPHRD_IP6GRE &&
139 t->dev->type != dev_type)
140 continue;
141
142 score = 0;
143 if (t->parms.link != link)
144 score |= 1;
145 if (t->dev->type != dev_type)
146 score |= 2;
147 if (score == 0)
148 return t;
149
150 if (score < cand_score) {
151 cand = t;
152 cand_score = score;
153 }
154 }
155
e086cadc 156 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
c12b395a 157 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
158 key != t->parms.i_key ||
159 !(t->dev->flags & IFF_UP))
160 continue;
161
162 if (t->dev->type != ARPHRD_IP6GRE &&
163 t->dev->type != dev_type)
164 continue;
165
166 score = 0;
167 if (t->parms.link != link)
168 score |= 1;
169 if (t->dev->type != dev_type)
170 score |= 2;
171 if (score == 0)
172 return t;
173
174 if (score < cand_score) {
175 cand = t;
176 cand_score = score;
177 }
178 }
179
e086cadc 180 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
c12b395a 181 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
182 (!ipv6_addr_equal(local, &t->parms.raddr) ||
183 !ipv6_addr_is_multicast(local))) ||
184 key != t->parms.i_key ||
185 !(t->dev->flags & IFF_UP))
186 continue;
187
188 if (t->dev->type != ARPHRD_IP6GRE &&
189 t->dev->type != dev_type)
190 continue;
191
192 score = 0;
193 if (t->parms.link != link)
194 score |= 1;
195 if (t->dev->type != dev_type)
196 score |= 2;
197 if (score == 0)
198 return t;
199
200 if (score < cand_score) {
201 cand = t;
202 cand_score = score;
203 }
204 }
205
e086cadc 206 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
c12b395a 207 if (t->parms.i_key != key ||
208 !(t->dev->flags & IFF_UP))
209 continue;
210
211 if (t->dev->type != ARPHRD_IP6GRE &&
212 t->dev->type != dev_type)
213 continue;
214
215 score = 0;
216 if (t->parms.link != link)
217 score |= 1;
218 if (t->dev->type != dev_type)
219 score |= 2;
220 if (score == 0)
221 return t;
222
223 if (score < cand_score) {
224 cand = t;
225 cand_score = score;
226 }
227 }
228
53b24b8f 229 if (cand)
c12b395a 230 return cand;
231
b80d0b93
WT		 232 if (gre_proto == htons(ETH_P_ERSPAN) ||
233 gre_proto == htons(ETH_P_ERSPAN2))
234 t = rcu_dereference(ign->collect_md_tun_erspan);
235 else
236 t = rcu_dereference(ign->collect_md_tun);
237
6712abc1
WT		 238 if (t && t->dev->flags & IFF_UP)
239 return t;
240
c12b395a 241 dev = ign->fb_tunnel_dev;
79134e6c 242 if (dev && dev->flags & IFF_UP)
c12b395a 243 return netdev_priv(dev);
244
245 return NULL;
246}
247
248static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
249 const struct __ip6_tnl_parm *p)
250{
251 const struct in6_addr *remote = &p->raddr;
252 const struct in6_addr *local = &p->laddr;
253 unsigned int h = HASH_KEY(p->i_key);
254 int prio = 0;
255
256 if (!ipv6_addr_any(local))
257 prio |= 1;
258 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
259 prio |= 2;
260 h ^= HASH_ADDR(remote);
261 }
262
263 return &ign->tunnels[prio][h];
264}
265
b80d0b93
WT		 266static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
267{
268 if (t->parms.collect_md)
269 rcu_assign_pointer(ign->collect_md_tun, t);
270}
271
272static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
273{
274 if (t->parms.collect_md)
275 rcu_assign_pointer(ign->collect_md_tun_erspan, t);
276}
277
278static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t)
279{
280 if (t->parms.collect_md)
281 rcu_assign_pointer(ign->collect_md_tun, NULL);
282}
283
284static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign,
285 struct ip6_tnl *t)
286{
287 if (t->parms.collect_md)
288 rcu_assign_pointer(ign->collect_md_tun_erspan, NULL);
289}
290
c12b395a 291static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
292 const struct ip6_tnl *t)
293{
294 return __ip6gre_bucket(ign, &t->parms);
295}
296
297static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
298{
299 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
300
301 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
302 rcu_assign_pointer(*tp, t);
303}
304
305static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
306{
307 struct ip6_tnl __rcu **tp;
308 struct ip6_tnl *iter;
309
310 for (tp = ip6gre_bucket(ign, t);
311 (iter = rtnl_dereference(*tp)) != NULL;
312 tp = &iter->next) {
313 if (t == iter) {
314 rcu_assign_pointer(*tp, t->next);
315 break;
316 }
317 }
318}
319
320static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
321 const struct __ip6_tnl_parm *parms,
322 int type)
323{
324 const struct in6_addr *remote = &parms->raddr;
325 const struct in6_addr *local = &parms->laddr;
326 __be32 key = parms->i_key;
327 int link = parms->link;
328 struct ip6_tnl *t;
329 struct ip6_tnl __rcu **tp;
330 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
331
332 for (tp = __ip6gre_bucket(ign, parms);
333 (t = rtnl_dereference(*tp)) != NULL;
334 tp = &t->next)
335 if (ipv6_addr_equal(local, &t->parms.laddr) &&
336 ipv6_addr_equal(remote, &t->parms.raddr) &&
337 key == t->parms.i_key &&
338 link == t->parms.link &&
339 type == t->dev->type)
340 break;
341
342 return t;
343}
344
345static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
346 const struct __ip6_tnl_parm *parms, int create)
347{
348 struct ip6_tnl *t, *nt;
349 struct net_device *dev;
350 char name[IFNAMSIZ];
351 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
352
353 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
cd0a0bd9
SK		 354 if (t && create)
355 return NULL;
c12b395a 356 if (t || !create)
357 return t;
358
5f42df01
ED		 359 if (parms->name[0]) {
360 if (!dev_valid_name(parms->name))
361 return NULL;
c12b395a 362 strlcpy(name, parms->name, IFNAMSIZ);
5f42df01 363 } else {
c12b395a 364 strcpy(name, "ip6gre%d");
5f42df01 365 }
c835a677
TG		 366 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
367 ip6gre_tunnel_setup);
c12b395a 368 if (!dev)
369 return NULL;
370
371 dev_net_set(dev, net);
372
373 nt = netdev_priv(dev);
374 nt->parms = *parms;
375 dev->rtnl_link_ops = &ip6gre_link_ops;
376
377 nt->dev = dev;
0bd87628 378 nt->net = dev_net(dev);
c12b395a 379
380 if (register_netdevice(dev) < 0)
381 goto failed_free;
382
128bb975
AK		 383 ip6gre_tnl_link_config(nt, 1);
384
c12b395a 385 /* Can use a lockless transmit, unless we generate output sequences */
b45bd1d7 386 if (!(nt->parms.o_flags & TUNNEL_SEQ))
c12b395a 387 dev->features |= NETIF_F_LLTX;
388
389 dev_hold(dev);
390 ip6gre_tunnel_link(ign, nt);
391 return nt;
392
393failed_free:
394 free_netdev(dev);
395 return NULL;
396}
397
b80d0b93
WT		 398static void ip6erspan_tunnel_uninit(struct net_device *dev)
399{
400 struct ip6_tnl *t = netdev_priv(dev);
401 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
402
403 ip6erspan_tunnel_unlink_md(ign, t);
404 ip6gre_tunnel_unlink(ign, t);
405 dst_cache_reset(&t->dst_cache);
406 dev_put(dev);
407}
408
c12b395a 409static void ip6gre_tunnel_uninit(struct net_device *dev)
410{
22f08069
ND		 411 struct ip6_tnl *t = netdev_priv(dev);
412 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
c12b395a 413
b80d0b93 414 ip6gre_tunnel_unlink_md(ign, t);
22f08069 415 ip6gre_tunnel_unlink(ign, t);
607f725f 416 dst_cache_reset(&t->dst_cache);
c12b395a 417 dev_put(dev);
418}
419
420
32bbd879 421static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
7892032c 422 u8 type, u8 code, int offset, __be32 info)
c12b395a 423{
929fc032 424 struct net *net = dev_net(skb->dev);
7892032c 425 const struct ipv6hdr *ipv6h;
a82738ad 426 struct tnl_ptk_info tpi;
c12b395a 427 struct ip6_tnl *t;
c12b395a 428
a82738ad
HY		 429 if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6),
430 offset) < 0)
32bbd879 431 return -EINVAL;
c12b395a 432
b87fb39e 433 ipv6h = (const struct ipv6hdr *)skb->data;
c12b395a 434 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
a82738ad 435 tpi.key, tpi.proto);
63159f29 436 if (!t)
32bbd879 437 return -ENOENT;
c12b395a 438
439 switch (type) {
c12b395a 440 struct ipv6_tlv_tnl_enc_lim *tel;
fe1a4ca0 441 __u32 teli;
c12b395a 442 case ICMPV6_DEST_UNREACH:
a46496ce
MB		 443 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
444 t->parms.name);
f8d20b46
XL		 445 if (code != ICMPV6_PORT_UNREACH)
446 break;
32bbd879 447 return 0;
c12b395a 448 case ICMPV6_TIME_EXCEED:
449 if (code == ICMPV6_EXC_HOPLIMIT) {
a46496ce
MB		 450 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
451 t->parms.name);
f8d20b46 452 break;
c12b395a 453 }
32bbd879 454 return 0;
c12b395a 455 case ICMPV6_PARAMPROB:
456 teli = 0;
457 if (code == ICMPV6_HDR_FIELD)
458 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
459
d1e158e2 460 if (teli && teli == be32_to_cpu(info) - 2) {
c12b395a 461 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
462 if (tel->encap_limit == 0) {
a46496ce
MB		 463 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
464 t->parms.name);
c12b395a 465 }
466 } else {
a46496ce
MB		 467 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
468 t->parms.name);
c12b395a 469 }
32bbd879 470 return 0;
c12b395a 471 case ICMPV6_PKT_TOOBIG:
fe1a4ca0 472 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
32bbd879 473 return 0;
929fc032
XL		 474 case NDISC_REDIRECT:
475 ip6_redirect(skb, net, skb->dev->ifindex, 0,
476 sock_net_uid(net, NULL));
32bbd879 477 return 0;
c12b395a 478 }
479
480 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
481 t->err_count++;
482 else
483 t->err_count = 1;
484 t->err_time = jiffies;
32bbd879
SB		 485
486 return 0;
c12b395a 487}
488
308edfdf 489static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
c12b395a 490{
491 const struct ipv6hdr *ipv6h;
c12b395a 492 struct ip6_tnl *tunnel;
c12b395a 493
494 ipv6h = ipv6_hdr(skb);
c12b395a 495 tunnel = ip6gre_tunnel_lookup(skb->dev,
308edfdf
TH		 496 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
497 tpi->proto);
c12b395a 498 if (tunnel) {
6712abc1
WT		 499 if (tunnel->parms.collect_md) {
500 struct metadata_dst *tun_dst;
501 __be64 tun_id;
502 __be16 flags;
503
504 flags = tpi->flags;
505 tun_id = key32_to_tunnel_id(tpi->key);
506
507 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
508 if (!tun_dst)
509 return PACKET_REJECT;
510
511 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
512 } else {
513 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
514 }
c12b395a 515
308edfdf
TH		 516 return PACKET_RCVD;
517 }
eccc1bb8 518
308edfdf
TH		 519 return PACKET_REJECT;
520}
eccc1bb8 521
a057fed3 522static int ip6erspan_rcv(struct sk_buff *skb,
2a3cabae
LB		 523 struct tnl_ptk_info *tpi,
524 int gre_hdr_len)
5a963eb6 525{
1d7e2ed2 526 struct erspan_base_hdr *ershdr;
5a963eb6 527 const struct ipv6hdr *ipv6h;
3df19283 528 struct erspan_md2 *md2;
5a963eb6 529 struct ip6_tnl *tunnel;
1d7e2ed2 530 u8 ver;
5a963eb6 531
293a1991
HY		 532 ipv6h = ipv6_hdr(skb);
533 ershdr = (struct erspan_base_hdr *)skb->data;
c69de58b 534 ver = ershdr->ver;
5a963eb6
WT		 535
536 tunnel = ip6gre_tunnel_lookup(skb->dev,
537 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
538 tpi->proto);
539 if (tunnel) {
1d7e2ed2
WT		 540 int len = erspan_hdr_len(ver);
541
542 if (unlikely(!pskb_may_pull(skb, len)))
ae3e1337 543 return PACKET_REJECT;
1d7e2ed2
WT		 544
545 if (__iptunnel_pull_header(skb, len,
5a963eb6
WT		 546 htons(ETH_P_TEB),
547 false, false) < 0)
548 return PACKET_REJECT;
549
ef7baf5e 550 if (tunnel->parms.collect_md) {
2a3cabae 551 struct erspan_metadata *pkt_md, *md;
ef7baf5e
WT		 552 struct metadata_dst *tun_dst;
553 struct ip_tunnel_info *info;
2a3cabae 554 unsigned char *gh;
ef7baf5e
WT		 555 __be64 tun_id;
556 __be16 flags;
557
558 tpi->flags |= TUNNEL_KEY;
559 flags = tpi->flags;
560 tun_id = key32_to_tunnel_id(tpi->key);
561
562 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
563 sizeof(*md));
564 if (!tun_dst)
565 return PACKET_REJECT;
566
2a3cabae
LB		 567 /* skb can be uncloned in __iptunnel_pull_header, so
568 * old pkt_md is no longer valid and we need to reset
569 * it
570 */
571 gh = skb_network_header(skb) +
572 skb_network_header_len(skb);
573 pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len +
574 sizeof(*ershdr));
ef7baf5e
WT		 575 info = &tun_dst->u.tun_info;
576 md = ip_tunnel_info_opts(info);
94d7d8f2 577 md->version = ver;
3df19283
WT		 578 md2 = &md->u.md2;
579 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
580 ERSPAN_V2_MDSIZE);
ef7baf5e
WT		 581 info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
582 info->options_len = sizeof(*md);
583
584 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
585
586 } else {
ef7baf5e
WT		 587 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
588 }
5a963eb6
WT		 589
590 return PACKET_RCVD;
591 }
592
593 return PACKET_REJECT;
594}
595
308edfdf
TH		 596static int gre_rcv(struct sk_buff *skb)
597{
598 struct tnl_ptk_info tpi;
599 bool csum_err = false;
600 int hdr_len;
eccc1bb8 601
e582615a 602 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
f132ae7c 603 if (hdr_len < 0)
308edfdf 604 goto drop;
c12b395a 605
308edfdf
TH		 606 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
607 goto drop;
c12b395a 608
94d7d8f2
WT		 609 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
610 tpi.proto == htons(ETH_P_ERSPAN2))) {
2a3cabae 611 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
5a963eb6 612 return 0;
a7343211 613 goto out;
5a963eb6
WT		 614 }
615
308edfdf 616 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
c12b395a 617 return 0;
c12b395a 618
a7343211 619out:
308edfdf 620 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
c12b395a 621drop:
c12b395a 622 kfree_skb(skb);
623 return 0;
624}
625
b05229f4 626static int gre_handle_offloads(struct sk_buff *skb, bool csum)
c12b395a 627{
b05229f4
TH		 628 return iptunnel_handle_offloads(skb,
629 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
c12b395a 630}
631
898b2979
WT		 632static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
633 struct net_device *dev,
634 struct flowi6 *fl6, __u8 *dsfield,
635 int *encap_limit)
636{
637 const struct iphdr *iph = ip_hdr(skb);
638 struct ip6_tnl *t = netdev_priv(dev);
639
640 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
641 *encap_limit = t->parms.encap_limit;
642
643 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
644
645 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
646 *dsfield = ipv4_get_dsfield(iph);
647 else
648 *dsfield = ip6_tclass(t->parms.flowinfo);
649
650 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
651 fl6->flowi6_mark = skb->mark;
652 else
653 fl6->flowi6_mark = t->parms.fwmark;
654
655 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
656}
657
658static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
659 struct net_device *dev,
660 struct flowi6 *fl6, __u8 *dsfield,
661 int *encap_limit)
662{
663 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
664 struct ip6_tnl *t = netdev_priv(dev);
665 __u16 offset;
666
667 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
668 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
669
670 if (offset > 0) {
671 struct ipv6_tlv_tnl_enc_lim *tel;
672
673 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
674 if (tel->encap_limit == 0) {
675 icmpv6_send(skb, ICMPV6_PARAMPROB,
676 ICMPV6_HDR_FIELD, offset + 2);
677 return -1;
678 }
679 *encap_limit = tel->encap_limit - 1;
680 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
681 *encap_limit = t->parms.encap_limit;
682 }
683
684 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
685
686 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
687 *dsfield = ipv6_get_dsfield(ipv6h);
688 else
689 *dsfield = ip6_tclass(t->parms.flowinfo);
690
691 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
692 fl6->flowlabel |= ip6_flowlabel(ipv6h);
693
694 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
695 fl6->flowi6_mark = skb->mark;
696 else
697 fl6->flowi6_mark = t->parms.fwmark;
698
699 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
700
701 return 0;
702}
703
b05229f4
TH		 704static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
705 struct net_device *dev, __u8 dsfield,
706 struct flowi6 *fl6, int encap_limit,
707 __u32 *pmtu, __be16 proto)
c12b395a 708{
c12b395a 709 struct ip6_tnl *tunnel = netdev_priv(dev);
8aec4959 710 __be16 protocol;
c12b395a 711
712 if (dev->type == ARPHRD_ETHER)
713 IPCB(skb)->flags = 0;
714
b05229f4
TH		 715 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
716 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
717 else
c12b395a 718 fl6->daddr = tunnel->parms.raddr;
c12b395a 719
01b8d064
PM		 720 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
721 return -ENOMEM;
722
b05229f4 723 /* Push GRE header. */
8aec4959 724 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
6712abc1
WT		 725
726 if (tunnel->parms.collect_md) {
727 struct ip_tunnel_info *tun_info;
728 const struct ip_tunnel_key *key;
729 __be16 flags;
730
731 tun_info = skb_tunnel_info(skb);
732 if (unlikely(!tun_info ||
733 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
734 ip_tunnel_info_af(tun_info) != AF_INET6))
735 return -EINVAL;
736
737 key = &tun_info->key;
738 memset(fl6, 0, sizeof(*fl6));
739 fl6->flowi6_proto = IPPROTO_GRE;
740 fl6->daddr = key->u.ipv6.dst;
741 fl6->flowlabel = key->label;
742 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
743
744 dsfield = key->tos;
77a5196a
WT		 745 flags = key->tun_flags &
746 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
6712abc1
WT		 747 tunnel->tun_hlen = gre_calc_hlen(flags);
748
749 gre_build_header(skb, tunnel->tun_hlen,
750 flags, protocol,
77a5196a 751 tunnel_id_to_key32(tun_info->key.tun_id),
15746394 752 (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++)
77a5196a 753 : 0);
6712abc1
WT		 754
755 } else {
77a5196a
WT		 756 if (tunnel->parms.o_flags & TUNNEL_SEQ)
757 tunnel->o_seqno++;
758
6712abc1
WT		 759 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
760 protocol, tunnel->parms.o_key,
761 htonl(tunnel->o_seqno));
762 }
c12b395a 763
b05229f4
TH		 764 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
765 NEXTHDR_GRE);
c12b395a 766}
767
768static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
769{
770 struct ip6_tnl *t = netdev_priv(dev);
c12b395a 771 int encap_limit = -1;
772 struct flowi6 fl6;
6712abc1 773 __u8 dsfield = 0;
c12b395a 774 __u32 mtu;
775 int err;
776
5146d1f1
BH		 777 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
778
6712abc1
WT		 779 if (!t->parms.collect_md)
780 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
781 &dsfield, &encap_limit);
e2d118a1 782
b05229f4
TH		 783 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
784 if (err)
785 return -1;
786
787 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
788 skb->protocol);
c12b395a 789 if (err != 0) {
790 /* XXX: send ICMP error even if DF is not set. */
791 if (err == -EMSGSIZE)
792 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
793 htonl(mtu));
794 return -1;
795 }
796
797 return 0;
798}
799
800static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
801{
802 struct ip6_tnl *t = netdev_priv(dev);
803 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
804 int encap_limit = -1;
c12b395a 805 struct flowi6 fl6;
6712abc1 806 __u8 dsfield = 0;
c12b395a 807 __u32 mtu;
808 int err;
809
810 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
811 return -1;
812
6712abc1
WT		 813 if (!t->parms.collect_md &&
814 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
898b2979 815 return -1;
e2d118a1 816
b05229f4
TH		 817 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
818 return -1;
819
820 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
821 &mtu, skb->protocol);
c12b395a 822 if (err != 0) {
823 if (err == -EMSGSIZE)
824 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
825 return -1;
826 }
827
828 return 0;
829}
830
831/**
7ccbdff1 832 * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own
c12b395a 833 * @t: the outgoing tunnel device
834 * @hdr: IPv6 header from the incoming packet
835 *
836 * Description:
837 * Avoid trivial tunneling loop by checking that tunnel exit-point
838 * doesn't match source of incoming packet.
839 *
840 * Return:
841 * 1 if conflict,
842 * 0 else
843 **/
844
845static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
846 const struct ipv6hdr *hdr)
847{
848 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
849}
850
851static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
852{
853 struct ip6_tnl *t = netdev_priv(dev);
854 int encap_limit = -1;
855 struct flowi6 fl6;
856 __u32 mtu;
857 int err;
858
859 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
860 encap_limit = t->parms.encap_limit;
861
6712abc1
WT		 862 if (!t->parms.collect_md)
863 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
c12b395a 864
b05229f4
TH		 865 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
866 if (err)
867 return err;
868
869 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
c12b395a 870
871 return err;
872}
873
874static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
875 struct net_device *dev)
876{
877 struct ip6_tnl *t = netdev_priv(dev);
878 struct net_device_stats *stats = &t->dev->stats;
879 int ret;
880
cb9f1b78
WB		 881 if (!pskb_inet_may_pull(skb))
882 goto tx_err;
883
d5005140 884 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
41ab3e31 885 goto tx_err;
c12b395a 886
887 switch (skb->protocol) {
888 case htons(ETH_P_IP):
889 ret = ip6gre_xmit_ipv4(skb, dev);
890 break;
891 case htons(ETH_P_IPV6):
892 ret = ip6gre_xmit_ipv6(skb, dev);
893 break;
894 default:
895 ret = ip6gre_xmit_other(skb, dev);
896 break;
897 }
898
899 if (ret < 0)
900 goto tx_err;
901
902 return NETDEV_TX_OK;
903
904tx_err:
905 stats->tx_errors++;
906 stats->tx_dropped++;
907 kfree_skb(skb);
908 return NETDEV_TX_OK;
909}
910
5a963eb6
WT		 911static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
912 struct net_device *dev)
913{
5a963eb6
WT		 914 struct ip6_tnl *t = netdev_priv(dev);
915 struct dst_entry *dst = skb_dst(skb);
916 struct net_device_stats *stats;
917 bool truncate = false;
918 int encap_limit = -1;
919 __u8 dsfield = false;
920 struct flowi6 fl6;
921 int err = -EINVAL;
20704bd1 922 __be16 proto;
5a963eb6 923 __u32 mtu;
1baf5ebf 924 int nhoff;
d5db21a3 925 int thoff;
5a963eb6 926
cb9f1b78
WB		 927 if (!pskb_inet_may_pull(skb))
928 goto tx_err;
929
5a963eb6
WT		 930 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
931 goto tx_err;
932
933 if (gre_handle_offloads(skb, false))
934 goto tx_err;
935
5a963eb6
WT		 936 if (skb->len > dev->mtu + dev->hard_header_len) {
937 pskb_trim(skb, dev->mtu + dev->hard_header_len);
938 truncate = true;
939 }
940
1baf5ebf
WT		 941 nhoff = skb_network_header(skb) - skb_mac_header(skb);
942 if (skb->protocol == htons(ETH_P_IP) &&
943 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
944 truncate = true;
945
d5db21a3
WT		 946 thoff = skb_transport_header(skb) - skb_mac_header(skb);
947 if (skb->protocol == htons(ETH_P_IPV6) &&
948 (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff))
949 truncate = true;
950
5691484d 951 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
e41c7c68
WT		 952 goto tx_err;
953
5a963eb6 954 t->parms.o_flags &= ~TUNNEL_KEY;
5a963eb6 955 IPCB(skb)->flags = 0;
ef7baf5e
WT		 956
957 /* For collect_md mode, derive fl6 from the tunnel key,
958 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
959 */
960 if (t->parms.collect_md) {
961 struct ip_tunnel_info *tun_info;
962 const struct ip_tunnel_key *key;
963 struct erspan_metadata *md;
c69de58b 964 __be32 tun_id;
ef7baf5e
WT		 965
966 tun_info = skb_tunnel_info(skb);
967 if (unlikely(!tun_info ||
968 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
969 ip_tunnel_info_af(tun_info) != AF_INET6))
970 return -EINVAL;
971
972 key = &tun_info->key;
973 memset(&fl6, 0, sizeof(fl6));
974 fl6.flowi6_proto = IPPROTO_GRE;
975 fl6.daddr = key->u.ipv6.dst;
976 fl6.flowlabel = key->label;
977 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
978
979 dsfield = key->tos;
256c87c1
PJV		 980 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
981 goto tx_err;
ef7baf5e
WT		 982 md = ip_tunnel_info_opts(tun_info);
983 if (!md)
984 goto tx_err;
985
c69de58b 986 tun_id = tunnel_id_to_key32(key->tun_id);
94d7d8f2
WT		 987 if (md->version == 1) {
988 erspan_build_header(skb,
c69de58b 989 ntohl(tun_id),
94d7d8f2
WT		 990 ntohl(md->u.index), truncate,
991 false);
992 } else if (md->version == 2) {
94d7d8f2 993 erspan_build_header_v2(skb,
c69de58b
WT		 994 ntohl(tun_id),
995 md->u.md2.dir,
996 get_hwid(&md->u.md2),
997 truncate, false);
d6aa7119
WT		 998 } else {
999 goto tx_err;
94d7d8f2 1000 }
ef7baf5e
WT		 1001 } else {
1002 switch (skb->protocol) {
1003 case htons(ETH_P_IP):
1004 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1005 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1006 &dsfield, &encap_limit);
1007 break;
1008 case htons(ETH_P_IPV6):
cb9f1b78 1009 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
ef7baf5e
WT		 1010 goto tx_err;
1011 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1012 &dsfield, &encap_limit))
1013 goto tx_err;
1014 break;
1015 default:
1016 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1017 break;
1018 }
1019
94d7d8f2 1020 if (t->parms.erspan_ver == 1)
c69de58b 1021 erspan_build_header(skb, ntohl(t->parms.o_key),
94d7d8f2
WT		 1022 t->parms.index,
1023 truncate, false);
02f99df1 1024 else if (t->parms.erspan_ver == 2)
c69de58b 1025 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
94d7d8f2
WT		 1026 t->parms.dir,
1027 t->parms.hwid,
1028 truncate, false);
02f99df1
WT		 1029 else
1030 goto tx_err;
1031
ef7baf5e
WT		 1032 fl6.daddr = t->parms.raddr;
1033 }
5a963eb6
WT		 1034
1035 /* Push GRE header. */
20704bd1
XL		 1036 proto = (t->parms.erspan_ver == 1) ? htons(ETH_P_ERSPAN)
1037 : htons(ETH_P_ERSPAN2);
1038 gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(t->o_seqno++));
5a963eb6
WT		 1039
1040 /* TooBig packet may have updated dst->dev's mtu */
ef7baf5e 1041 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
5a963eb6
WT		 1042 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu);
1043
1044 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1045 NEXTHDR_GRE);
1046 if (err != 0) {
1047 /* XXX: send ICMP error even if DF is not set. */
1048 if (err == -EMSGSIZE) {
1049 if (skb->protocol == htons(ETH_P_IP))
1050 icmp_send(skb, ICMP_DEST_UNREACH,
1051 ICMP_FRAG_NEEDED, htonl(mtu));
1052 else
1053 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1054 }
1055
1056 goto tx_err;
1057 }
1058 return NETDEV_TX_OK;
1059
1060tx_err:
1061 stats = &t->dev->stats;
1062 stats->tx_errors++;
1063 stats->tx_dropped++;
1064 kfree_skb(skb);
1065 return NETDEV_TX_OK;
1066}
1067
a483373e 1068static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
c12b395a 1069{
1070 struct net_device *dev = t->dev;
1071 struct __ip6_tnl_parm *p = &t->parms;
1072 struct flowi6 *fl6 = &t->fl.u.ip6;
c12b395a 1073
1074 if (dev->type != ARPHRD_ETHER) {
1075 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1076 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1077 }
1078
1079 /* Set up flowi template */
1080 fl6->saddr = p->laddr;
1081 fl6->daddr = p->raddr;
1082 fl6->flowi6_oif = p->link;
1083 fl6->flowlabel = 0;
252f3f5a 1084 fl6->flowi6_proto = IPPROTO_GRE;
c12b395a 1085
1086 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1087 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1088 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1089 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1090
1091 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1092 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1093
1094 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1095 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1096 dev->flags |= IFF_POINTOPOINT;
1097 else
1098 dev->flags &= ~IFF_POINTOPOINT;
a483373e 1099}
c12b395a 1100
a483373e
PM		 1101static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1102 int t_hlen)
1103{
1104 const struct __ip6_tnl_parm *p = &t->parms;
1105 struct net_device *dev = t->dev;
c12b395a 1106
1107 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1108 int strict = (ipv6_addr_type(&p->raddr) &
1109 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1110
22f08069 1111 struct rt6_info *rt = rt6_lookup(t->net,
c12b395a 1112 &p->raddr, &p->laddr,
b75cc8f9 1113 p->link, NULL, strict);
c12b395a 1114
63159f29 1115 if (!rt)
c12b395a 1116 return;
1117
1118 if (rt->dst.dev) {
eb95f52f 1119 dev->needed_headroom = rt->dst.dev->hard_header_len +
db2ec95d 1120 t_hlen;
c12b395a 1121
1122 if (set_mtu) {
db2ec95d 1123 dev->mtu = rt->dst.dev->mtu - t_hlen;
c12b395a 1124 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1125 dev->mtu -= 8;
a9e242ca
AD		 1126 if (dev->type == ARPHRD_ETHER)
1127 dev->mtu -= ETH_HLEN;
c12b395a 1128
1129 if (dev->mtu < IPV6_MIN_MTU)
1130 dev->mtu = IPV6_MIN_MTU;
1131 }
1132 }
94e187c0 1133 ip6_rt_put(rt);
c12b395a 1134 }
c12b395a 1135}
1136
a483373e
PM		 1137static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1138{
1139 int t_hlen;
1140
1141 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1142 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1143
1144 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
eb95f52f 1145 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
a483373e
PM		 1146 return t_hlen;
1147}
1148
1149static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1150{
1151 ip6gre_tnl_link_config_common(t);
1152 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1153}
1154
a6465350
PM		 1155static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1156 const struct __ip6_tnl_parm *p)
c12b395a 1157{
1158 t->parms.laddr = p->laddr;
1159 t->parms.raddr = p->raddr;
1160 t->parms.flags = p->flags;
1161 t->parms.hop_limit = p->hop_limit;
1162 t->parms.encap_limit = p->encap_limit;
1163 t->parms.flowinfo = p->flowinfo;
1164 t->parms.link = p->link;
1165 t->parms.proto = p->proto;
1166 t->parms.i_key = p->i_key;
1167 t->parms.o_key = p->o_key;
1168 t->parms.i_flags = p->i_flags;
1169 t->parms.o_flags = p->o_flags;
0a473b82 1170 t->parms.fwmark = p->fwmark;
80b3671e
HL		 1171 t->parms.erspan_ver = p->erspan_ver;
1172 t->parms.index = p->index;
1173 t->parms.dir = p->dir;
1174 t->parms.hwid = p->hwid;
607f725f 1175 dst_cache_reset(&t->dst_cache);
a6465350
PM		 1176}
1177
1178static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1179 int set_mtu)
1180{
1181 ip6gre_tnl_copy_tnl_parm(t, p);
c12b395a 1182 ip6gre_tnl_link_config(t, set_mtu);
1183 return 0;
1184}
1185
1186static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1187 const struct ip6_tnl_parm2 *u)
1188{
1189 p->laddr = u->laddr;
1190 p->raddr = u->raddr;
1191 p->flags = u->flags;
1192 p->hop_limit = u->hop_limit;
1193 p->encap_limit = u->encap_limit;
1194 p->flowinfo = u->flowinfo;
1195 p->link = u->link;
1196 p->i_key = u->i_key;
1197 p->o_key = u->o_key;
f41fe3c2
TH		 1198 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1199 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
c12b395a 1200 memcpy(p->name, u->name, sizeof(u->name));
1201}
1202
1203static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1204 const struct __ip6_tnl_parm *p)
1205{
1206 u->proto = IPPROTO_GRE;
1207 u->laddr = p->laddr;
1208 u->raddr = p->raddr;
1209 u->flags = p->flags;
1210 u->hop_limit = p->hop_limit;
1211 u->encap_limit = p->encap_limit;
1212 u->flowinfo = p->flowinfo;
1213 u->link = p->link;
1214 u->i_key = p->i_key;
1215 u->o_key = p->o_key;
f41fe3c2
TH		 1216 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1217 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
c12b395a 1218 memcpy(u->name, p->name, sizeof(u->name));
1219}
1220
1221static int ip6gre_tunnel_ioctl(struct net_device *dev,
1222 struct ifreq *ifr, int cmd)
1223{
1224 int err = 0;
1225 struct ip6_tnl_parm2 p;
1226 struct __ip6_tnl_parm p1;
22f08069
ND		 1227 struct ip6_tnl *t = netdev_priv(dev);
1228 struct net *net = t->net;
c12b395a 1229 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1230
308edfdf
TH		 1231 memset(&p1, 0, sizeof(p1));
1232
c12b395a 1233 switch (cmd) {
1234 case SIOCGETTUNNEL:
c12b395a 1235 if (dev == ign->fb_tunnel_dev) {
1236 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1237 err = -EFAULT;
1238 break;
1239 }
1240 ip6gre_tnl_parm_from_user(&p1, &p);
1241 t = ip6gre_tunnel_locate(net, &p1, 0);
63159f29 1242 if (!t)
22f08069 1243 t = netdev_priv(dev);
c12b395a 1244 }
5dbd5068 1245 memset(&p, 0, sizeof(p));
c12b395a 1246 ip6gre_tnl_parm_to_user(&p, &t->parms);
1247 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1248 err = -EFAULT;
1249 break;
1250
1251 case SIOCADDTUNNEL:
1252 case SIOCCHGTUNNEL:
1253 err = -EPERM;
af31f412 1254 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
c12b395a 1255 goto done;
1256
1257 err = -EFAULT;
1258 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1259 goto done;
1260
1261 err = -EINVAL;
1262 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1263 goto done;
1264
1265 if (!(p.i_flags&GRE_KEY))
1266 p.i_key = 0;
1267 if (!(p.o_flags&GRE_KEY))
1268 p.o_key = 0;
1269
1270 ip6gre_tnl_parm_from_user(&p1, &p);
1271 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1272
1273 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
53b24b8f 1274 if (t) {
c12b395a 1275 if (t->dev != dev) {
1276 err = -EEXIST;
1277 break;
1278 }
1279 } else {
1280 t = netdev_priv(dev);
1281
1282 ip6gre_tunnel_unlink(ign, t);
1283 synchronize_net();
1284 ip6gre_tnl_change(t, &p1, 1);
1285 ip6gre_tunnel_link(ign, t);
1286 netdev_state_change(dev);
1287 }
1288 }
1289
1290 if (t) {
1291 err = 0;
1292
5dbd5068 1293 memset(&p, 0, sizeof(p));
c12b395a 1294 ip6gre_tnl_parm_to_user(&p, &t->parms);
1295 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1296 err = -EFAULT;
1297 } else
1298 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1299 break;
1300
1301 case SIOCDELTUNNEL:
1302 err = -EPERM;
af31f412 1303 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
c12b395a 1304 goto done;
1305
1306 if (dev == ign->fb_tunnel_dev) {
1307 err = -EFAULT;
1308 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1309 goto done;
1310 err = -ENOENT;
1311 ip6gre_tnl_parm_from_user(&p1, &p);
1312 t = ip6gre_tunnel_locate(net, &p1, 0);
63159f29 1313 if (!t)
c12b395a 1314 goto done;
1315 err = -EPERM;
1316 if (t == netdev_priv(ign->fb_tunnel_dev))
1317 goto done;
1318 dev = t->dev;
1319 }
1320 unregister_netdevice(dev);
1321 err = 0;
1322 break;
1323
1324 default:
1325 err = -EINVAL;
1326 }
1327
1328done:
1329 return err;
1330}
1331
c12b395a 1332static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
76cc0d32
XL		 1333 unsigned short type, const void *daddr,
1334 const void *saddr, unsigned int len)
c12b395a 1335{
1336 struct ip6_tnl *t = netdev_priv(dev);
76cc0d32
XL		 1337 struct ipv6hdr *ipv6h;
1338 __be16 *p;
c12b395a 1339
76cc0d32
XL		 1340 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1341 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1342 t->fl.u.ip6.flowlabel,
1343 true, &t->fl.u.ip6));
c12b395a 1344 ipv6h->hop_limit = t->parms.hop_limit;
1345 ipv6h->nexthdr = NEXTHDR_GRE;
1346 ipv6h->saddr = t->parms.laddr;
1347 ipv6h->daddr = t->parms.raddr;
1348
76cc0d32
XL		 1349 p = (__be16 *)(ipv6h + 1);
1350 p[0] = t->parms.o_flags;
1351 p[1] = htons(type);
c12b395a 1352
1353 /*
1354 * Set the source hardware address.
1355 */
1356
1357 if (saddr)
1358 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1359 if (daddr)
1360 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1361 if (!ipv6_addr_any(&ipv6h->daddr))
1362 return t->hlen;
1363
1364 return -t->hlen;
1365}
1366
c12b395a 1367static const struct header_ops ip6gre_header_ops = {
1368 .create = ip6gre_header,
c12b395a 1369};
1370
1371static const struct net_device_ops ip6gre_netdev_ops = {
1372 .ndo_init = ip6gre_tunnel_init,
1373 .ndo_uninit = ip6gre_tunnel_uninit,
1374 .ndo_start_xmit = ip6gre_tunnel_xmit,
1375 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
b05229f4 1376 .ndo_change_mtu = ip6_tnl_change_mtu,
f61dd388 1377 .ndo_get_stats64 = ip_tunnel_get_stats64,
ecf2c06a 1378 .ndo_get_iflink = ip6_tnl_get_iflink,
c12b395a 1379};
1380
1381static void ip6gre_dev_free(struct net_device *dev)
1382{
cdf3464e
MKL		 1383 struct ip6_tnl *t = netdev_priv(dev);
1384
0c1dd2a1 1385 gro_cells_destroy(&t->gro_cells);
607f725f 1386 dst_cache_destroy(&t->dst_cache);
c12b395a 1387 free_percpu(dev->tstats);
c12b395a 1388}
1389
1390static void ip6gre_tunnel_setup(struct net_device *dev)
1391{
c12b395a 1392 dev->netdev_ops = &ip6gre_netdev_ops;
cf124db5
DM		 1393 dev->needs_free_netdev = true;
1394 dev->priv_destructor = ip6gre_dev_free;
c12b395a 1395
1396 dev->type = ARPHRD_IP6GRE;
b05229f4 1397
c12b395a 1398 dev->flags |= IFF_NOARP;
c12b395a 1399 dev->addr_len = sizeof(struct in6_addr);
02875878 1400 netif_keep_dst(dev);
45ce0fd1
FJ		 1401 /* This perm addr will be used as interface identifier by IPv6 */
1402 dev->addr_assign_type = NET_ADDR_RANDOM;
1403 eth_random_addr(dev->perm_addr);
c12b395a 1404}
1405
e5a9336a
AK		 1406#define GRE6_FEATURES (NETIF_F_SG | \
1407 NETIF_F_FRAGLIST | \
1408 NETIF_F_HIGHDMA | \
1409 NETIF_F_HW_CSUM)
1410
1411static void ip6gre_tnl_init_features(struct net_device *dev)
1412{
1413 struct ip6_tnl *nt = netdev_priv(dev);
1414
1415 dev->features |= GRE6_FEATURES;
1416 dev->hw_features |= GRE6_FEATURES;
1417
1418 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1419 /* TCP offload with GRE SEQ is not supported, nor
1420 * can we support 2 levels of outer headers requiring
1421 * an update.
1422 */
1423 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1424 nt->encap.type == TUNNEL_ENCAP_NONE) {
1425 dev->features |= NETIF_F_GSO_SOFTWARE;
1426 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1427 }
1428
1429 /* Can use a lockless transmit, unless we generate
1430 * output sequences
1431 */
1432 dev->features |= NETIF_F_LLTX;
1433 }
1434}
1435
a3c119d3 1436static int ip6gre_tunnel_init_common(struct net_device *dev)
c12b395a 1437{
1438 struct ip6_tnl *tunnel;
cdf3464e 1439 int ret;
b05229f4 1440 int t_hlen;
c12b395a 1441
1442 tunnel = netdev_priv(dev);
1443
1444 tunnel->dev = dev;
0bd87628 1445 tunnel->net = dev_net(dev);
c12b395a 1446 strcpy(tunnel->parms.name, dev->name);
1447
a3c119d3
MKL		 1448 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1449 if (!dev->tstats)
1450 return -ENOMEM;
1451
607f725f 1452 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
0c1dd2a1
EBE		 1453 if (ret)
1454 goto cleanup_alloc_pcpu_stats;
1455
1456 ret = gro_cells_init(&tunnel->gro_cells, dev);
1457 if (ret)
1458 goto cleanup_dst_cache_init;
cdf3464e 1459
a483373e 1460 t_hlen = ip6gre_calc_hlen(tunnel);
db2ec95d 1461 dev->mtu = ETH_DATA_LEN - t_hlen;
1b227e53
HY		 1462 if (dev->type == ARPHRD_ETHER)
1463 dev->mtu -= ETH_HLEN;
b05229f4
TH		 1464 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1465 dev->mtu -= 8;
1466
6712abc1
WT		 1467 if (tunnel->parms.collect_md) {
1468 dev->features |= NETIF_F_NETNS_LOCAL;
1469 netif_keep_dst(dev);
1470 }
e5a9336a 1471 ip6gre_tnl_init_features(dev);
6712abc1 1472
a3c119d3 1473 return 0;
0c1dd2a1
EBE		 1474
1475cleanup_dst_cache_init:
1476 dst_cache_destroy(&tunnel->dst_cache);
1477cleanup_alloc_pcpu_stats:
1478 free_percpu(dev->tstats);
1479 dev->tstats = NULL;
1480 return ret;
a3c119d3
MKL		 1481}
1482
1483static int ip6gre_tunnel_init(struct net_device *dev)
1484{
1485 struct ip6_tnl *tunnel;
1486 int ret;
1487
1488 ret = ip6gre_tunnel_init_common(dev);
1489 if (ret)
1490 return ret;
1491
1492 tunnel = netdev_priv(dev);
1493
6712abc1
WT		 1494 if (tunnel->parms.collect_md)
1495 return 0;
1496
c12b395a 1497 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1498 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1499
1500 if (ipv6_addr_any(&tunnel->parms.raddr))
1501 dev->header_ops = &ip6gre_header_ops;
1502
c12b395a 1503 return 0;
1504}
1505
1506static void ip6gre_fb_tunnel_init(struct net_device *dev)
1507{
1508 struct ip6_tnl *tunnel = netdev_priv(dev);
1509
1510 tunnel->dev = dev;
0bd87628 1511 tunnel->net = dev_net(dev);
c12b395a 1512 strcpy(tunnel->parms.name, dev->name);
1513
1514 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1515
1516 dev_hold(dev);
1517}
1518
c12b395a 1519static struct inet6_protocol ip6gre_protocol __read_mostly = {
308edfdf 1520 .handler = gre_rcv,
c12b395a 1521 .err_handler = ip6gre_err,
1522 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1523};
1524
22f08069 1525static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
c12b395a 1526{
22f08069
ND		 1527 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1528 struct net_device *dev, *aux;
c12b395a 1529 int prio;
1530
22f08069
ND		 1531 for_each_netdev_safe(net, dev, aux)
1532 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
5a963eb6
WT		 1533 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1534 dev->rtnl_link_ops == &ip6erspan_tap_ops)
22f08069
ND		 1535 unregister_netdevice_queue(dev, head);
1536
c12b395a 1537 for (prio = 0; prio < 4; prio++) {
1538 int h;
e87a8f24 1539 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
c12b395a 1540 struct ip6_tnl *t;
1541
1542 t = rtnl_dereference(ign->tunnels[prio][h]);
1543
53b24b8f 1544 while (t) {
22f08069
ND		 1545 /* If dev is in the same netns, it has already
1546 * been added to the list by the previous loop.
1547 */
1548 if (!net_eq(dev_net(t->dev), net))
1549 unregister_netdevice_queue(t->dev,
1550 head);
c12b395a 1551 t = rtnl_dereference(t->next);
1552 }
1553 }
1554 }
1555}
1556
1557static int __net_init ip6gre_init_net(struct net *net)
1558{
1559 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1560 int err;
1561
79134e6c
ED		 1562 if (!net_has_fallback_tunnels(net))
1563 return 0;
c12b395a 1564 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
c835a677
TG		 1565 NET_NAME_UNKNOWN,
1566 ip6gre_tunnel_setup);
c12b395a 1567 if (!ign->fb_tunnel_dev) {
1568 err = -ENOMEM;
1569 goto err_alloc_dev;
1570 }
1571 dev_net_set(ign->fb_tunnel_dev, net);
22f08069
ND		 1572 /* FB netdevice is special: we have one, and only one per netns.
1573 * Allowing to move it to another netns is clearly unsafe.
1574 */
1575 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1576
c12b395a 1577
1578 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1579 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1580
1581 err = register_netdev(ign->fb_tunnel_dev);
1582 if (err)
1583 goto err_reg_dev;
1584
1585 rcu_assign_pointer(ign->tunnels_wc[0],
1586 netdev_priv(ign->fb_tunnel_dev));
1587 return 0;
1588
1589err_reg_dev:
cf124db5 1590 free_netdev(ign->fb_tunnel_dev);
c12b395a 1591err_alloc_dev:
1592 return err;
1593}
1594
bb401cae 1595static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
c12b395a 1596{
bb401cae 1597 struct net *net;
c12b395a 1598 LIST_HEAD(list);
1599
c12b395a 1600 rtnl_lock();
bb401cae
ED		 1601 list_for_each_entry(net, net_list, exit_list)
1602 ip6gre_destroy_tunnels(net, &list);
c12b395a 1603 unregister_netdevice_many(&list);
1604 rtnl_unlock();
1605}
1606
1607static struct pernet_operations ip6gre_net_ops = {
1608 .init = ip6gre_init_net,
bb401cae 1609 .exit_batch = ip6gre_exit_batch_net,
c12b395a 1610 .id = &ip6gre_net_id,
1611 .size = sizeof(struct ip6gre_net),
1612};
1613
a8b8a889
MS		 1614static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1615 struct netlink_ext_ack *extack)
c12b395a 1616{
1617 __be16 flags;
1618
1619 if (!data)
1620 return 0;
1621
1622 flags = 0;
1623 if (data[IFLA_GRE_IFLAGS])
1624 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1625 if (data[IFLA_GRE_OFLAGS])
1626 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1627 if (flags & (GRE_VERSION|GRE_ROUTING))
1628 return -EINVAL;
1629
1630 return 0;
1631}
1632
a8b8a889
MS		 1633static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1634 struct netlink_ext_ack *extack)
c12b395a 1635{
1636 struct in6_addr daddr;
1637
1638 if (tb[IFLA_ADDRESS]) {
1639 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1640 return -EINVAL;
1641 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1642 return -EADDRNOTAVAIL;
1643 }
1644
1645 if (!data)
1646 goto out;
1647
1648 if (data[IFLA_GRE_REMOTE]) {
67b61f6c 1649 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
c12b395a 1650 if (ipv6_addr_any(&daddr))
1651 return -EINVAL;
1652 }
1653
1654out:
a8b8a889 1655 return ip6gre_tunnel_validate(tb, data, extack);
c12b395a 1656}
1657
5a963eb6
WT		 1658static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1659 struct netlink_ext_ack *extack)
1660{
1661 __be16 flags = 0;
94d7d8f2 1662 int ret, ver = 0;
5a963eb6
WT		 1663
1664 if (!data)
1665 return 0;
1666
1667 ret = ip6gre_tap_validate(tb, data, extack);
1668 if (ret)
1669 return ret;
1670
1671 /* ERSPAN should only have GRE sequence and key flag */
1672 if (data[IFLA_GRE_OFLAGS])
1673 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1674 if (data[IFLA_GRE_IFLAGS])
1675 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1676 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1677 flags != (GRE_SEQ | GRE_KEY))
1678 return -EINVAL;
1679
1680 /* ERSPAN Session ID only has 10-bit. Since we reuse
1681 * 32-bit key field as ID, check it's range.
1682 */
1683 if (data[IFLA_GRE_IKEY] &&
1684 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1685 return -EINVAL;
1686
1687 if (data[IFLA_GRE_OKEY] &&
1688 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1689 return -EINVAL;
1690
94d7d8f2
WT		 1691 if (data[IFLA_GRE_ERSPAN_VER]) {
1692 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1693 if (ver != 1 && ver != 2)
5a963eb6
WT		 1694 return -EINVAL;
1695 }
94d7d8f2
WT		 1696
1697 if (ver == 1) {
1698 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1699 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1700
1701 if (index & ~INDEX_MASK)
1702 return -EINVAL;
1703 }
1704 } else if (ver == 2) {
1705 if (data[IFLA_GRE_ERSPAN_DIR]) {
1706 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1707
1708 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1709 return -EINVAL;
1710 }
1711
1712 if (data[IFLA_GRE_ERSPAN_HWID]) {
1713 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1714
1715 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1716 return -EINVAL;
1717 }
1718 }
1719
5a963eb6
WT		 1720 return 0;
1721}
c12b395a 1722
4974d5f6
LB		 1723static void ip6erspan_set_version(struct nlattr *data[],
1724 struct __ip6_tnl_parm *parms)
1725{
efcc9bca
LB		 1726 if (!data)
1727 return;
1728
4974d5f6
LB		 1729 parms->erspan_ver = 1;
1730 if (data[IFLA_GRE_ERSPAN_VER])
1731 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1732
1733 if (parms->erspan_ver == 1) {
1734 if (data[IFLA_GRE_ERSPAN_INDEX])
1735 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1736 } else if (parms->erspan_ver == 2) {
1737 if (data[IFLA_GRE_ERSPAN_DIR])
1738 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1739 if (data[IFLA_GRE_ERSPAN_HWID])
1740 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1741 }
1742}
1743
c12b395a 1744static void ip6gre_netlink_parms(struct nlattr *data[],
1745 struct __ip6_tnl_parm *parms)
1746{
1747 memset(parms, 0, sizeof(*parms));
1748
1749 if (!data)
1750 return;
1751
1752 if (data[IFLA_GRE_LINK])
1753 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1754
1755 if (data[IFLA_GRE_IFLAGS])
f41fe3c2
TH		 1756 parms->i_flags = gre_flags_to_tnl_flags(
1757 nla_get_be16(data[IFLA_GRE_IFLAGS]));
c12b395a 1758
1759 if (data[IFLA_GRE_OFLAGS])
f41fe3c2
TH		 1760 parms->o_flags = gre_flags_to_tnl_flags(
1761 nla_get_be16(data[IFLA_GRE_OFLAGS]));
c12b395a 1762
1763 if (data[IFLA_GRE_IKEY])
1764 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1765
1766 if (data[IFLA_GRE_OKEY])
1767 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1768
1769 if (data[IFLA_GRE_LOCAL])
67b61f6c 1770 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
c12b395a 1771
1772 if (data[IFLA_GRE_REMOTE])
67b61f6c 1773 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
c12b395a 1774
1775 if (data[IFLA_GRE_TTL])
1776 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1777
1778 if (data[IFLA_GRE_ENCAP_LIMIT])
1779 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1780
1781 if (data[IFLA_GRE_FLOWINFO])
c2675de4 1782 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
c12b395a 1783
1784 if (data[IFLA_GRE_FLAGS])
1785 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
0a473b82
CG		 1786
1787 if (data[IFLA_GRE_FWMARK])
1788 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
5a963eb6 1789
6712abc1
WT		 1790 if (data[IFLA_GRE_COLLECT_METADATA])
1791 parms->collect_md = true;
c12b395a 1792}
1793
1794static int ip6gre_tap_init(struct net_device *dev)
1795{
a3c119d3 1796 int ret;
c12b395a 1797
a3c119d3
MKL		 1798 ret = ip6gre_tunnel_init_common(dev);
1799 if (ret)
1800 return ret;
c12b395a 1801
0a46baaf
SC		 1802 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1803
c12b395a 1804 return 0;
1805}
1806
1807static const struct net_device_ops ip6gre_tap_netdev_ops = {
1808 .ndo_init = ip6gre_tap_init,
1809 .ndo_uninit = ip6gre_tunnel_uninit,
1810 .ndo_start_xmit = ip6gre_tunnel_xmit,
1811 .ndo_set_mac_address = eth_mac_addr,
1812 .ndo_validate_addr = eth_validate_addr,
b05229f4 1813 .ndo_change_mtu = ip6_tnl_change_mtu,
f61dd388 1814 .ndo_get_stats64 = ip_tunnel_get_stats64,
ecf2c06a 1815 .ndo_get_iflink = ip6_tnl_get_iflink,
c12b395a 1816};
1817
2d665034
PM		 1818static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1819{
1820 int t_hlen;
1821
1822 tunnel->tun_hlen = 8;
1823 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1824 erspan_hdr_len(tunnel->parms.erspan_ver);
1825
1826 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
eb95f52f 1827 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
2d665034
PM		 1828 return t_hlen;
1829}
1830
5a963eb6
WT		 1831static int ip6erspan_tap_init(struct net_device *dev)
1832{
1833 struct ip6_tnl *tunnel;
1834 int t_hlen;
1835 int ret;
1836
1837 tunnel = netdev_priv(dev);
1838
1839 tunnel->dev = dev;
1840 tunnel->net = dev_net(dev);
1841 strcpy(tunnel->parms.name, dev->name);
1842
1843 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1844 if (!dev->tstats)
1845 return -ENOMEM;
1846
1847 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
0c1dd2a1
EBE		 1848 if (ret)
1849 goto cleanup_alloc_pcpu_stats;
1850
1851 ret = gro_cells_init(&tunnel->gro_cells, dev);
1852 if (ret)
1853 goto cleanup_dst_cache_init;
5a963eb6 1854
2d665034 1855 t_hlen = ip6erspan_calc_hlen(tunnel);
5a963eb6
WT		 1856 dev->mtu = ETH_DATA_LEN - t_hlen;
1857 if (dev->type == ARPHRD_ETHER)
1858 dev->mtu -= ETH_HLEN;
1859 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1860 dev->mtu -= 8;
1861
1862 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2d665034 1863 ip6erspan_tnl_link_config(tunnel, 1);
5a963eb6
WT		 1864
1865 return 0;
0c1dd2a1
EBE		 1866
1867cleanup_dst_cache_init:
1868 dst_cache_destroy(&tunnel->dst_cache);
1869cleanup_alloc_pcpu_stats:
1870 free_percpu(dev->tstats);
1871 dev->tstats = NULL;
1872 return ret;
5a963eb6
WT		 1873}
1874
1875static const struct net_device_ops ip6erspan_netdev_ops = {
1876 .ndo_init = ip6erspan_tap_init,
b80d0b93 1877 .ndo_uninit = ip6erspan_tunnel_uninit,
5a963eb6
WT		 1878 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1879 .ndo_set_mac_address = eth_mac_addr,
1880 .ndo_validate_addr = eth_validate_addr,
1881 .ndo_change_mtu = ip6_tnl_change_mtu,
1882 .ndo_get_stats64 = ip_tunnel_get_stats64,
1883 .ndo_get_iflink = ip6_tnl_get_iflink,
1884};
1885
c12b395a 1886static void ip6gre_tap_setup(struct net_device *dev)
1887{
1888
1889 ether_setup(dev);
1890
2c52129a 1891 dev->max_mtu = 0;
c12b395a 1892 dev->netdev_ops = &ip6gre_tap_netdev_ops;
cf124db5
DM		 1893 dev->needs_free_netdev = true;
1894 dev->priv_destructor = ip6gre_dev_free;
c12b395a 1895
c12b395a 1896 dev->features |= NETIF_F_NETNS_LOCAL;
d13b161c 1897 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
0a46baaf 1898 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2d40557c 1899 netif_keep_dst(dev);
c12b395a 1900}
1901
1faf3d9f
TH		 1902static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1903 struct ip_tunnel_encap *ipencap)
1904{
1905 bool ret = false;
1906
1907 memset(ipencap, 0, sizeof(*ipencap));
1908
1909 if (!data)
1910 return ret;
1911
1912 if (data[IFLA_GRE_ENCAP_TYPE]) {
1913 ret = true;
1914 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1915 }
1916
1917 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1918 ret = true;
1919 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1920 }
1921
1922 if (data[IFLA_GRE_ENCAP_SPORT]) {
1923 ret = true;
1924 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1925 }
1926
1927 if (data[IFLA_GRE_ENCAP_DPORT]) {
1928 ret = true;
1929 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1930 }
1931
1932 return ret;
1933}
1934
7fa38a7c
PM		 1935static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1936 struct nlattr *tb[], struct nlattr *data[],
1937 struct netlink_ext_ack *extack)
c12b395a 1938{
1939 struct ip6_tnl *nt;
1faf3d9f 1940 struct ip_tunnel_encap ipencap;
c12b395a 1941 int err;
1942
1943 nt = netdev_priv(dev);
1faf3d9f
TH		 1944
1945 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1946 int err = ip6_tnl_encap_setup(nt, &ipencap);
1947
1948 if (err < 0)
1949 return err;
1950 }
1951
c12b395a 1952 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1953 eth_hw_addr_random(dev);
1954
1955 nt->dev = dev;
0bd87628 1956 nt->net = dev_net(dev);
c12b395a 1957
c12b395a 1958 err = register_netdevice(dev);
1959 if (err)
1960 goto out;
1961
128bb975
AK		 1962 if (tb[IFLA_MTU])
1963 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1964
c12b395a 1965 dev_hold(dev);
c12b395a 1966
1967out:
1968 return err;
1969}
1970
7fa38a7c
PM		 1971static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1972 struct nlattr *tb[], struct nlattr *data[],
1973 struct netlink_ext_ack *extack)
1974{
7fa38a7c
PM		 1975 struct ip6_tnl *nt = netdev_priv(dev);
1976 struct net *net = dev_net(dev);
b80d0b93
WT		 1977 struct ip6gre_net *ign;
1978 int err;
1979
1980 ip6gre_netlink_parms(data, &nt->parms);
1981 ign = net_generic(net, ip6gre_net_id);
1982
1983 if (nt->parms.collect_md) {
1984 if (rtnl_dereference(ign->collect_md_tun))
1985 return -EEXIST;
1986 } else {
1987 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1988 return -EEXIST;
1989 }
7fa38a7c 1990
b80d0b93 1991 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
7fa38a7c
PM		 1992 if (!err) {
1993 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
b80d0b93 1994 ip6gre_tunnel_link_md(ign, nt);
7fa38a7c
PM		 1995 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
1996 }
1997 return err;
1998}
1999
c8632fc3
PM		 2000static struct ip6_tnl *
2001ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2002 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2003 struct netlink_ext_ack *extack)
c12b395a 2004{
22f08069
ND		 2005 struct ip6_tnl *t, *nt = netdev_priv(dev);
2006 struct net *net = nt->net;
c12b395a 2007 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1faf3d9f 2008 struct ip_tunnel_encap ipencap;
c12b395a 2009
2010 if (dev == ign->fb_tunnel_dev)
c8632fc3 2011 return ERR_PTR(-EINVAL);
c12b395a 2012
1faf3d9f
TH		 2013 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2014 int err = ip6_tnl_encap_setup(nt, &ipencap);
2015
2016 if (err < 0)
c8632fc3 2017 return ERR_PTR(err);
1faf3d9f
TH		 2018 }
2019
c8632fc3 2020 ip6gre_netlink_parms(data, p_p);
c12b395a 2021
c8632fc3 2022 t = ip6gre_tunnel_locate(net, p_p, 0);
c12b395a 2023
2024 if (t) {
2025 if (t->dev != dev)
c8632fc3 2026 return ERR_PTR(-EEXIST);
c12b395a 2027 } else {
2028 t = nt;
c12b395a 2029 }
2030
c8632fc3
PM		 2031 return t;
2032}
2033
2034static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2035 struct nlattr *data[],
2036 struct netlink_ext_ack *extack)
2037{
ab5098fa
OM		 2038 struct ip6_tnl *t = netdev_priv(dev);
2039 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
c8632fc3 2040 struct __ip6_tnl_parm p;
c8632fc3
PM		 2041
2042 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2043 if (IS_ERR(t))
2044 return PTR_ERR(t);
2045
b80d0b93 2046 ip6gre_tunnel_unlink_md(ign, t);
6a61d4db
ND		 2047 ip6gre_tunnel_unlink(ign, t);
2048 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
b80d0b93 2049 ip6gre_tunnel_link_md(ign, t);
6a61d4db 2050 ip6gre_tunnel_link(ign, t);
c12b395a 2051 return 0;
2052}
2053
54d63f78
ND		 2054static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2055{
2056 struct net *net = dev_net(dev);
2057 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2058
2059 if (dev != ign->fb_tunnel_dev)
2060 unregister_netdevice_queue(dev, head);
2061}
2062
c12b395a 2063static size_t ip6gre_get_size(const struct net_device *dev)
2064{
2065 return
2066 /* IFLA_GRE_LINK */
2067 nla_total_size(4) +
2068 /* IFLA_GRE_IFLAGS */
2069 nla_total_size(2) +
2070 /* IFLA_GRE_OFLAGS */
2071 nla_total_size(2) +
2072 /* IFLA_GRE_IKEY */
2073 nla_total_size(4) +
2074 /* IFLA_GRE_OKEY */
2075 nla_total_size(4) +
2076 /* IFLA_GRE_LOCAL */
a3754133 2077 nla_total_size(sizeof(struct in6_addr)) +
c12b395a 2078 /* IFLA_GRE_REMOTE */
a3754133 2079 nla_total_size(sizeof(struct in6_addr)) +
c12b395a 2080 /* IFLA_GRE_TTL */
2081 nla_total_size(1) +
c12b395a 2082 /* IFLA_GRE_ENCAP_LIMIT */
2083 nla_total_size(1) +
2084 /* IFLA_GRE_FLOWINFO */
2085 nla_total_size(4) +
2086 /* IFLA_GRE_FLAGS */
2087 nla_total_size(4) +
1faf3d9f
TH		 2088 /* IFLA_GRE_ENCAP_TYPE */
2089 nla_total_size(2) +
2090 /* IFLA_GRE_ENCAP_FLAGS */
2091 nla_total_size(2) +
2092 /* IFLA_GRE_ENCAP_SPORT */
2093 nla_total_size(2) +
2094 /* IFLA_GRE_ENCAP_DPORT */
2095 nla_total_size(2) +
6712abc1
WT		 2096 /* IFLA_GRE_COLLECT_METADATA */
2097 nla_total_size(0) +
0a473b82
CG		 2098 /* IFLA_GRE_FWMARK */
2099 nla_total_size(4) +
5a963eb6
WT		 2100 /* IFLA_GRE_ERSPAN_INDEX */
2101 nla_total_size(4) +
c12b395a 2102 0;
2103}
2104
2105static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2106{
2107 struct ip6_tnl *t = netdev_priv(dev);
2108 struct __ip6_tnl_parm *p = &t->parms;
c706863b
LB		 2109 __be16 o_flags = p->o_flags;
2110
103d0244
LB		 2111 if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2112 if (!p->collect_md)
2113 o_flags |= TUNNEL_KEY;
2114
2115 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2116 goto nla_put_failure;
2117
2118 if (p->erspan_ver == 1) {
2119 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2120 goto nla_put_failure;
2121 } else {
2122 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2123 goto nla_put_failure;
2124 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2125 goto nla_put_failure;
2126 }
2127 }
c12b395a 2128
2129 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
f41fe3c2
TH		 2130 nla_put_be16(skb, IFLA_GRE_IFLAGS,
2131 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2132 nla_put_be16(skb, IFLA_GRE_OFLAGS,
c706863b 2133 gre_tnl_flags_to_gre_flags(o_flags)) ||
c12b395a 2134 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2135 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
930345ea
JB		 2136 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2137 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
c12b395a 2138 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
c12b395a 2139 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2140 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
0a473b82 2141 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
103d0244 2142 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
c12b395a 2143 goto nla_put_failure;
1faf3d9f
TH		 2144
2145 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2146 t->encap.type) ||
2147 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2148 t->encap.sport) ||
2149 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2150 t->encap.dport) ||
2151 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2152 t->encap.flags))
2153 goto nla_put_failure;
2154
6712abc1
WT		 2155 if (p->collect_md) {
2156 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2157 goto nla_put_failure;
2158 }
2159
c12b395a 2160 return 0;
2161
2162nla_put_failure:
2163 return -EMSGSIZE;
2164}
2165
2166static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2167 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2168 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2169 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2170 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2171 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2172 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
2173 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
2174 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2175 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2176 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2177 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1faf3d9f
TH		 2178 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2179 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2180 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2181 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
6712abc1 2182 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
0a473b82 2183 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
5a963eb6 2184 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
94d7d8f2
WT		 2185 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2186 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2187 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
c12b395a 2188};
2189
5a963eb6
WT		 2190static void ip6erspan_tap_setup(struct net_device *dev)
2191{
2192 ether_setup(dev);
2193
2194 dev->netdev_ops = &ip6erspan_netdev_ops;
2195 dev->needs_free_netdev = true;
2196 dev->priv_destructor = ip6gre_dev_free;
2197
2198 dev->features |= NETIF_F_NETNS_LOCAL;
2199 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2200 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2201 netif_keep_dst(dev);
2202}
2203
2d665034
PM		 2204static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2205 struct nlattr *tb[], struct nlattr *data[],
2206 struct netlink_ext_ack *extack)
2207{
2d665034
PM		 2208 struct ip6_tnl *nt = netdev_priv(dev);
2209 struct net *net = dev_net(dev);
b80d0b93
WT		 2210 struct ip6gre_net *ign;
2211 int err;
2212
2213 ip6gre_netlink_parms(data, &nt->parms);
4974d5f6 2214 ip6erspan_set_version(data, &nt->parms);
b80d0b93
WT		 2215 ign = net_generic(net, ip6gre_net_id);
2216
2217 if (nt->parms.collect_md) {
2218 if (rtnl_dereference(ign->collect_md_tun_erspan))
2219 return -EEXIST;
2220 } else {
2221 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2222 return -EEXIST;
2223 }
2d665034 2224
b80d0b93 2225 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2d665034
PM		 2226 if (!err) {
2227 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
b80d0b93 2228 ip6erspan_tunnel_link_md(ign, nt);
2d665034
PM		 2229 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2230 }
2231 return err;
2232}
2233
2234static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2235{
2236 ip6gre_tnl_link_config_common(t);
2237 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2238}
2239
2240static int ip6erspan_tnl_change(struct ip6_tnl *t,
2241 const struct __ip6_tnl_parm *p, int set_mtu)
2242{
2243 ip6gre_tnl_copy_tnl_parm(t, p);
2244 ip6erspan_tnl_link_config(t, set_mtu);
2245 return 0;
2246}
2247
2248static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2249 struct nlattr *data[],
2250 struct netlink_ext_ack *extack)
2251{
2252 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2253 struct __ip6_tnl_parm p;
2254 struct ip6_tnl *t;
2255
2256 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2257 if (IS_ERR(t))
2258 return PTR_ERR(t);
2259
4974d5f6 2260 ip6erspan_set_version(data, &p);
b80d0b93 2261 ip6gre_tunnel_unlink_md(ign, t);
2d665034
PM		 2262 ip6gre_tunnel_unlink(ign, t);
2263 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
b80d0b93 2264 ip6erspan_tunnel_link_md(ign, t);
2d665034
PM		 2265 ip6gre_tunnel_link(ign, t);
2266 return 0;
2267}
2268
c12b395a 2269static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2270 .kind = "ip6gre",
2271 .maxtype = IFLA_GRE_MAX,
2272 .policy = ip6gre_policy,
2273 .priv_size = sizeof(struct ip6_tnl),
2274 .setup = ip6gre_tunnel_setup,
2275 .validate = ip6gre_tunnel_validate,
2276 .newlink = ip6gre_newlink,
2277 .changelink = ip6gre_changelink,
54d63f78 2278 .dellink = ip6gre_dellink,
c12b395a 2279 .get_size = ip6gre_get_size,
2280 .fill_info = ip6gre_fill_info,
1728d4fa 2281 .get_link_net = ip6_tnl_get_link_net,
c12b395a 2282};
2283
2284static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2285 .kind = "ip6gretap",
2286 .maxtype = IFLA_GRE_MAX,
2287 .policy = ip6gre_policy,
2288 .priv_size = sizeof(struct ip6_tnl),
2289 .setup = ip6gre_tap_setup,
2290 .validate = ip6gre_tap_validate,
2291 .newlink = ip6gre_newlink,
2292 .changelink = ip6gre_changelink,
2293 .get_size = ip6gre_get_size,
2294 .fill_info = ip6gre_fill_info,
3390e397 2295 .get_link_net = ip6_tnl_get_link_net,
c12b395a 2296};
2297
5a963eb6
WT		 2298static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2299 .kind = "ip6erspan",
2300 .maxtype = IFLA_GRE_MAX,
2301 .policy = ip6gre_policy,
2302 .priv_size = sizeof(struct ip6_tnl),
2303 .setup = ip6erspan_tap_setup,
2304 .validate = ip6erspan_tap_validate,
2d665034
PM		 2305 .newlink = ip6erspan_newlink,
2306 .changelink = ip6erspan_changelink,
5a963eb6
WT		 2307 .get_size = ip6gre_get_size,
2308 .fill_info = ip6gre_fill_info,
2309 .get_link_net = ip6_tnl_get_link_net,
2310};
2311
c12b395a 2312/*
2313 * And now the modules code and kernel interface.
2314 */
2315
2316static int __init ip6gre_init(void)
2317{
2318 int err;
2319
2320 pr_info("GRE over IPv6 tunneling driver\n");
2321
2322 err = register_pernet_device(&ip6gre_net_ops);
2323 if (err < 0)
2324 return err;
2325
2326 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2327 if (err < 0) {
2328 pr_info("%s: can't add protocol\n", __func__);
2329 goto add_proto_failed;
2330 }
2331
2332 err = rtnl_link_register(&ip6gre_link_ops);
2333 if (err < 0)
2334 goto rtnl_link_failed;
2335
2336 err = rtnl_link_register(&ip6gre_tap_ops);
2337 if (err < 0)
2338 goto tap_ops_failed;
2339
5a963eb6
WT		 2340 err = rtnl_link_register(&ip6erspan_tap_ops);
2341 if (err < 0)
2342 goto erspan_link_failed;
2343
c12b395a 2344out:
2345 return err;
2346
5a963eb6
WT		 2347erspan_link_failed:
2348 rtnl_link_unregister(&ip6gre_tap_ops);
c12b395a 2349tap_ops_failed:
2350 rtnl_link_unregister(&ip6gre_link_ops);
2351rtnl_link_failed:
2352 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2353add_proto_failed:
2354 unregister_pernet_device(&ip6gre_net_ops);
2355 goto out;
2356}
2357
2358static void __exit ip6gre_fini(void)
2359{
2360 rtnl_link_unregister(&ip6gre_tap_ops);
2361 rtnl_link_unregister(&ip6gre_link_ops);
5a963eb6 2362 rtnl_link_unregister(&ip6erspan_tap_ops);
c12b395a 2363 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2364 unregister_pernet_device(&ip6gre_net_ops);
2365}
2366
2367module_init(ip6gre_init);
2368module_exit(ip6gre_fini);
2369MODULE_LICENSE("GPL");
2370MODULE_AUTHOR("D. Kozlov ([email protected])");
2371MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2372MODULE_ALIAS_RTNL_LINK("ip6gre");
5a4ee9a9 2373MODULE_ALIAS_RTNL_LINK("ip6gretap");
94d7d8f2 2374MODULE_ALIAS_RTNL_LINK("ip6erspan");
c12b395a 2375MODULE_ALIAS_NETDEV("ip6gre0");
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