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Merge tag 'x86_kdump_for_v5.19_rc1' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-block.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 (xeb@mail.ru)
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;
dafabb65 130 struct net_device *ndev;
c12b395a 131
e086cadc 132 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
c12b395a 133 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
134 !ipv6_addr_equal(remote, &t->parms.raddr) ||
135 key != t->parms.i_key ||
136 !(t->dev->flags & IFF_UP))
137 continue;
138
139 if (t->dev->type != ARPHRD_IP6GRE &&
140 t->dev->type != dev_type)
141 continue;
142
143 score = 0;
144 if (t->parms.link != link)
145 score |= 1;
146 if (t->dev->type != dev_type)
147 score |= 2;
148 if (score == 0)
149 return t;
150
151 if (score < cand_score) {
152 cand = t;
153 cand_score = score;
154 }
155 }
156
e086cadc 157 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
c12b395a 158 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
159 key != t->parms.i_key ||
160 !(t->dev->flags & IFF_UP))
161 continue;
162
163 if (t->dev->type != ARPHRD_IP6GRE &&
164 t->dev->type != dev_type)
165 continue;
166
167 score = 0;
168 if (t->parms.link != link)
169 score |= 1;
170 if (t->dev->type != dev_type)
171 score |= 2;
172 if (score == 0)
173 return t;
174
175 if (score < cand_score) {
176 cand = t;
177 cand_score = score;
178 }
179 }
180
e086cadc 181 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
c12b395a 182 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
183 (!ipv6_addr_equal(local, &t->parms.raddr) ||
184 !ipv6_addr_is_multicast(local))) ||
185 key != t->parms.i_key ||
186 !(t->dev->flags & IFF_UP))
187 continue;
188
189 if (t->dev->type != ARPHRD_IP6GRE &&
190 t->dev->type != dev_type)
191 continue;
192
193 score = 0;
194 if (t->parms.link != link)
195 score |= 1;
196 if (t->dev->type != dev_type)
197 score |= 2;
198 if (score == 0)
199 return t;
200
201 if (score < cand_score) {
202 cand = t;
203 cand_score = score;
204 }
205 }
206
e086cadc 207 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
c12b395a 208 if (t->parms.i_key != key ||
209 !(t->dev->flags & IFF_UP))
210 continue;
211
212 if (t->dev->type != ARPHRD_IP6GRE &&
213 t->dev->type != dev_type)
214 continue;
215
216 score = 0;
217 if (t->parms.link != link)
218 score |= 1;
219 if (t->dev->type != dev_type)
220 score |= 2;
221 if (score == 0)
222 return t;
223
224 if (score < cand_score) {
225 cand = t;
226 cand_score = score;
227 }
228 }
229
53b24b8f 230 if (cand)
c12b395a 231 return cand;
232
b80d0b93
WT		 233 if (gre_proto == htons(ETH_P_ERSPAN) ||
234 gre_proto == htons(ETH_P_ERSPAN2))
235 t = rcu_dereference(ign->collect_md_tun_erspan);
236 else
237 t = rcu_dereference(ign->collect_md_tun);
238
6712abc1
WT		 239 if (t && t->dev->flags & IFF_UP)
240 return t;
241
dafabb65
TY		 242 ndev = READ_ONCE(ign->fb_tunnel_dev);
243 if (ndev && ndev->flags & IFF_UP)
244 return netdev_priv(ndev);
c12b395a 245
246 return NULL;
247}
248
249static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
250 const struct __ip6_tnl_parm *p)
251{
252 const struct in6_addr *remote = &p->raddr;
253 const struct in6_addr *local = &p->laddr;
254 unsigned int h = HASH_KEY(p->i_key);
255 int prio = 0;
256
257 if (!ipv6_addr_any(local))
258 prio |= 1;
259 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
260 prio |= 2;
261 h ^= HASH_ADDR(remote);
262 }
263
264 return &ign->tunnels[prio][h];
265}
266
b80d0b93
WT		 267static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
268{
269 if (t->parms.collect_md)
270 rcu_assign_pointer(ign->collect_md_tun, t);
271}
272
273static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
274{
275 if (t->parms.collect_md)
276 rcu_assign_pointer(ign->collect_md_tun_erspan, t);
277}
278
279static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t)
280{
281 if (t->parms.collect_md)
282 rcu_assign_pointer(ign->collect_md_tun, NULL);
283}
284
285static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign,
286 struct ip6_tnl *t)
287{
288 if (t->parms.collect_md)
289 rcu_assign_pointer(ign->collect_md_tun_erspan, NULL);
290}
291
c12b395a 292static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
293 const struct ip6_tnl *t)
294{
295 return __ip6gre_bucket(ign, &t->parms);
296}
297
298static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
299{
300 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
301
302 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
303 rcu_assign_pointer(*tp, t);
304}
305
306static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
307{
308 struct ip6_tnl __rcu **tp;
309 struct ip6_tnl *iter;
310
311 for (tp = ip6gre_bucket(ign, t);
312 (iter = rtnl_dereference(*tp)) != NULL;
313 tp = &iter->next) {
314 if (t == iter) {
315 rcu_assign_pointer(*tp, t->next);
316 break;
317 }
318 }
319}
320
321static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
322 const struct __ip6_tnl_parm *parms,
323 int type)
324{
325 const struct in6_addr *remote = &parms->raddr;
326 const struct in6_addr *local = &parms->laddr;
327 __be32 key = parms->i_key;
328 int link = parms->link;
329 struct ip6_tnl *t;
330 struct ip6_tnl __rcu **tp;
331 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
332
333 for (tp = __ip6gre_bucket(ign, parms);
334 (t = rtnl_dereference(*tp)) != NULL;
335 tp = &t->next)
336 if (ipv6_addr_equal(local, &t->parms.laddr) &&
337 ipv6_addr_equal(remote, &t->parms.raddr) &&
338 key == t->parms.i_key &&
339 link == t->parms.link &&
340 type == t->dev->type)
341 break;
342
343 return t;
344}
345
346static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
347 const struct __ip6_tnl_parm *parms, int create)
348{
349 struct ip6_tnl *t, *nt;
350 struct net_device *dev;
351 char name[IFNAMSIZ];
352 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
353
354 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
cd0a0bd9
SK		 355 if (t && create)
356 return NULL;
c12b395a 357 if (t || !create)
358 return t;
359
5f42df01
ED		 360 if (parms->name[0]) {
361 if (!dev_valid_name(parms->name))
362 return NULL;
c12b395a 363 strlcpy(name, parms->name, IFNAMSIZ);
5f42df01 364 } else {
c12b395a 365 strcpy(name, "ip6gre%d");
5f42df01 366 }
c835a677
TG		 367 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
368 ip6gre_tunnel_setup);
c12b395a 369 if (!dev)
370 return NULL;
371
372 dev_net_set(dev, net);
373
374 nt = netdev_priv(dev);
375 nt->parms = *parms;
376 dev->rtnl_link_ops = &ip6gre_link_ops;
377
378 nt->dev = dev;
0bd87628 379 nt->net = dev_net(dev);
c12b395a 380
381 if (register_netdevice(dev) < 0)
382 goto failed_free;
383
128bb975
AK		 384 ip6gre_tnl_link_config(nt, 1);
385
c12b395a 386 /* Can use a lockless transmit, unless we generate output sequences */
b45bd1d7 387 if (!(nt->parms.o_flags & TUNNEL_SEQ))
c12b395a 388 dev->features |= NETIF_F_LLTX;
389
c12b395a 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);
56c1c779 406 dev_put_track(dev, &t->dev_tracker);
b80d0b93
WT		 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);
dafabb65
TY		 416 if (ign->fb_tunnel_dev == dev)
417 WRITE_ONCE(ign->fb_tunnel_dev, NULL);
607f725f 418 dst_cache_reset(&t->dst_cache);
56c1c779 419 dev_put_track(dev, &t->dev_tracker);
c12b395a 420}
421
422
32bbd879 423static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
7892032c 424 u8 type, u8 code, int offset, __be32 info)
c12b395a 425{
929fc032 426 struct net *net = dev_net(skb->dev);
7892032c 427 const struct ipv6hdr *ipv6h;
a82738ad 428 struct tnl_ptk_info tpi;
c12b395a 429 struct ip6_tnl *t;
c12b395a 430
a82738ad
HY		 431 if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6),
432 offset) < 0)
32bbd879 433 return -EINVAL;
c12b395a 434
b87fb39e 435 ipv6h = (const struct ipv6hdr *)skb->data;
c12b395a 436 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
a82738ad 437 tpi.key, tpi.proto);
63159f29 438 if (!t)
32bbd879 439 return -ENOENT;
c12b395a 440
441 switch (type) {
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;
46d30cb1
KC		 455 case ICMPV6_PARAMPROB: {
456 struct ipv6_tlv_tnl_enc_lim *tel;
457 __u32 teli;
458
c12b395a 459 teli = 0;
460 if (code == ICMPV6_HDR_FIELD)
461 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
462
d1e158e2 463 if (teli && teli == be32_to_cpu(info) - 2) {
c12b395a 464 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
465 if (tel->encap_limit == 0) {
a46496ce
MB		 466 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
467 t->parms.name);
c12b395a 468 }
469 } else {
a46496ce
MB		 470 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
471 t->parms.name);
c12b395a 472 }
32bbd879 473 return 0;
46d30cb1 474 }
c12b395a 475 case ICMPV6_PKT_TOOBIG:
fe1a4ca0 476 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
32bbd879 477 return 0;
929fc032
XL		 478 case NDISC_REDIRECT:
479 ip6_redirect(skb, net, skb->dev->ifindex, 0,
480 sock_net_uid(net, NULL));
32bbd879 481 return 0;
c12b395a 482 }
483
484 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
485 t->err_count++;
486 else
487 t->err_count = 1;
488 t->err_time = jiffies;
32bbd879
SB		 489
490 return 0;
c12b395a 491}
492
308edfdf 493static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
c12b395a 494{
495 const struct ipv6hdr *ipv6h;
c12b395a 496 struct ip6_tnl *tunnel;
c12b395a 497
498 ipv6h = ipv6_hdr(skb);
c12b395a 499 tunnel = ip6gre_tunnel_lookup(skb->dev,
308edfdf
TH		 500 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
501 tpi->proto);
c12b395a 502 if (tunnel) {
6712abc1
WT		 503 if (tunnel->parms.collect_md) {
504 struct metadata_dst *tun_dst;
505 __be64 tun_id;
506 __be16 flags;
507
508 flags = tpi->flags;
509 tun_id = key32_to_tunnel_id(tpi->key);
510
511 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
512 if (!tun_dst)
513 return PACKET_REJECT;
514
515 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
516 } else {
517 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
518 }
c12b395a 519
308edfdf
TH		 520 return PACKET_RCVD;
521 }
eccc1bb8 522
308edfdf
TH		 523 return PACKET_REJECT;
524}
eccc1bb8 525
a057fed3 526static int ip6erspan_rcv(struct sk_buff *skb,
2a3cabae
LB		 527 struct tnl_ptk_info *tpi,
528 int gre_hdr_len)
5a963eb6 529{
1d7e2ed2 530 struct erspan_base_hdr *ershdr;
5a963eb6 531 const struct ipv6hdr *ipv6h;
3df19283 532 struct erspan_md2 *md2;
5a963eb6 533 struct ip6_tnl *tunnel;
1d7e2ed2 534 u8 ver;
5a963eb6 535
293a1991
HY		 536 ipv6h = ipv6_hdr(skb);
537 ershdr = (struct erspan_base_hdr *)skb->data;
c69de58b 538 ver = ershdr->ver;
5a963eb6
WT		 539
540 tunnel = ip6gre_tunnel_lookup(skb->dev,
541 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
542 tpi->proto);
543 if (tunnel) {
1d7e2ed2
WT		 544 int len = erspan_hdr_len(ver);
545
546 if (unlikely(!pskb_may_pull(skb, len)))
ae3e1337 547 return PACKET_REJECT;
1d7e2ed2
WT		 548
549 if (__iptunnel_pull_header(skb, len,
5a963eb6
WT		 550 htons(ETH_P_TEB),
551 false, false) < 0)
552 return PACKET_REJECT;
553
ef7baf5e 554 if (tunnel->parms.collect_md) {
2a3cabae 555 struct erspan_metadata *pkt_md, *md;
ef7baf5e
WT		 556 struct metadata_dst *tun_dst;
557 struct ip_tunnel_info *info;
2a3cabae 558 unsigned char *gh;
ef7baf5e
WT		 559 __be64 tun_id;
560 __be16 flags;
561
562 tpi->flags |= TUNNEL_KEY;
563 flags = tpi->flags;
564 tun_id = key32_to_tunnel_id(tpi->key);
565
566 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
567 sizeof(*md));
568 if (!tun_dst)
569 return PACKET_REJECT;
570
2a3cabae
LB		 571 /* skb can be uncloned in __iptunnel_pull_header, so
572 * old pkt_md is no longer valid and we need to reset
573 * it
574 */
575 gh = skb_network_header(skb) +
576 skb_network_header_len(skb);
577 pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len +
578 sizeof(*ershdr));
ef7baf5e
WT		 579 info = &tun_dst->u.tun_info;
580 md = ip_tunnel_info_opts(info);
94d7d8f2 581 md->version = ver;
3df19283
WT		 582 md2 = &md->u.md2;
583 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
584 ERSPAN_V2_MDSIZE);
ef7baf5e
WT		 585 info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
586 info->options_len = sizeof(*md);
587
588 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
589
590 } else {
ef7baf5e
WT		 591 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
592 }
5a963eb6
WT		 593
594 return PACKET_RCVD;
595 }
596
597 return PACKET_REJECT;
598}
599
308edfdf
TH		 600static int gre_rcv(struct sk_buff *skb)
601{
602 struct tnl_ptk_info tpi;
603 bool csum_err = false;
604 int hdr_len;
eccc1bb8 605
e582615a 606 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
f132ae7c 607 if (hdr_len < 0)
308edfdf 608 goto drop;
c12b395a 609
308edfdf
TH		 610 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
611 goto drop;
c12b395a 612
94d7d8f2
WT		 613 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
614 tpi.proto == htons(ETH_P_ERSPAN2))) {
2a3cabae 615 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
5a963eb6 616 return 0;
a7343211 617 goto out;
5a963eb6
WT		 618 }
619
308edfdf 620 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
c12b395a 621 return 0;
c12b395a 622
a7343211 623out:
308edfdf 624 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
c12b395a 625drop:
c12b395a 626 kfree_skb(skb);
627 return 0;
628}
629
b05229f4 630static int gre_handle_offloads(struct sk_buff *skb, bool csum)
c12b395a 631{
b05229f4
TH		 632 return iptunnel_handle_offloads(skb,
633 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
c12b395a 634}
635
898b2979
WT		 636static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
637 struct net_device *dev,
638 struct flowi6 *fl6, __u8 *dsfield,
639 int *encap_limit)
640{
641 const struct iphdr *iph = ip_hdr(skb);
642 struct ip6_tnl *t = netdev_priv(dev);
643
644 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
645 *encap_limit = t->parms.encap_limit;
646
647 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
648
649 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
650 *dsfield = ipv4_get_dsfield(iph);
651 else
652 *dsfield = ip6_tclass(t->parms.flowinfo);
653
654 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
655 fl6->flowi6_mark = skb->mark;
656 else
657 fl6->flowi6_mark = t->parms.fwmark;
658
659 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
660}
661
662static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
663 struct net_device *dev,
664 struct flowi6 *fl6, __u8 *dsfield,
665 int *encap_limit)
666{
3bc817d6 667 struct ipv6hdr *ipv6h;
898b2979
WT		 668 struct ip6_tnl *t = netdev_priv(dev);
669 __u16 offset;
670
671 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
672 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
3bc817d6 673 ipv6h = ipv6_hdr(skb);
898b2979
WT		 674
675 if (offset > 0) {
676 struct ipv6_tlv_tnl_enc_lim *tel;
677
678 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
679 if (tel->encap_limit == 0) {
4372339e
JD		 680 icmpv6_ndo_send(skb, ICMPV6_PARAMPROB,
681 ICMPV6_HDR_FIELD, offset + 2);
898b2979
WT		 682 return -1;
683 }
684 *encap_limit = tel->encap_limit - 1;
685 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
686 *encap_limit = t->parms.encap_limit;
687 }
688
689 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
690
691 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
692 *dsfield = ipv6_get_dsfield(ipv6h);
693 else
694 *dsfield = ip6_tclass(t->parms.flowinfo);
695
696 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
697 fl6->flowlabel |= ip6_flowlabel(ipv6h);
698
699 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
700 fl6->flowi6_mark = skb->mark;
701 else
702 fl6->flowi6_mark = t->parms.fwmark;
703
704 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
705
706 return 0;
707}
708
e5f7e211
DC		 709static struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb)
710{
711 struct ip_tunnel_info *tun_info;
712
713 tun_info = skb_tunnel_info(skb);
714 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX)))
715 return ERR_PTR(-EINVAL);
716
717 return tun_info;
718}
719
b05229f4
TH		 720static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
721 struct net_device *dev, __u8 dsfield,
722 struct flowi6 *fl6, int encap_limit,
723 __u32 *pmtu, __be16 proto)
c12b395a 724{
c12b395a 725 struct ip6_tnl *tunnel = netdev_priv(dev);
8aec4959 726 __be16 protocol;
fde98ae9 727 __be16 flags;
c12b395a 728
729 if (dev->type == ARPHRD_ETHER)
730 IPCB(skb)->flags = 0;
731
b05229f4
TH		 732 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
733 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
734 else
c12b395a 735 fl6->daddr = tunnel->parms.raddr;
c12b395a 736
b05229f4 737 /* Push GRE header. */
8aec4959 738 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
6712abc1
WT		 739
740 if (tunnel->parms.collect_md) {
741 struct ip_tunnel_info *tun_info;
742 const struct ip_tunnel_key *key;
f40c064e 743 int tun_hlen;
6712abc1 744
e5f7e211
DC		 745 tun_info = skb_tunnel_info_txcheck(skb);
746 if (IS_ERR(tun_info) ||
747 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
6712abc1
WT		 748 return -EINVAL;
749
750 key = &tun_info->key;
751 memset(fl6, 0, sizeof(*fl6));
752 fl6->flowi6_proto = IPPROTO_GRE;
753 fl6->daddr = key->u.ipv6.dst;
754 fl6->flowlabel = key->label;
755 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
bcf141b2 756 fl6->fl6_gre_key = tunnel_id_to_key32(key->tun_id);
6712abc1
WT		 757
758 dsfield = key->tos;
77a5196a
WT		 759 flags = key->tun_flags &
760 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
f40c064e 761 tun_hlen = gre_calc_hlen(flags);
6712abc1 762
ab198e1d
PY		 763 if (skb_cow_head(skb, dev->needed_headroom ?: tun_hlen + tunnel->encap_hlen))
764 return -ENOMEM;
765
f40c064e 766 gre_build_header(skb, tun_hlen,
6712abc1 767 flags, protocol,
77a5196a 768 tunnel_id_to_key32(tun_info->key.tun_id),
31c417c9 769 (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno))
77a5196a 770 : 0);
6712abc1
WT		 771
772 } else {
ab198e1d
PY		 773 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
774 return -ENOMEM;
775
fde98ae9
PY		 776 flags = tunnel->parms.o_flags;
777
778 gre_build_header(skb, tunnel->tun_hlen, flags,
6712abc1 779 protocol, tunnel->parms.o_key,
31c417c9
PY		 780 (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno))
781 : 0);
6712abc1 782 }
c12b395a 783
b05229f4
TH		 784 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
785 NEXTHDR_GRE);
c12b395a 786}
787
788static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
789{
790 struct ip6_tnl *t = netdev_priv(dev);
c12b395a 791 int encap_limit = -1;
792 struct flowi6 fl6;
6712abc1 793 __u8 dsfield = 0;
c12b395a 794 __u32 mtu;
795 int err;
796
5146d1f1
BH		 797 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
798
6712abc1
WT		 799 if (!t->parms.collect_md)
800 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
801 &dsfield, &encap_limit);
e2d118a1 802
b05229f4
TH		 803 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
804 if (err)
805 return -1;
806
807 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
808 skb->protocol);
c12b395a 809 if (err != 0) {
810 /* XXX: send ICMP error even if DF is not set. */
811 if (err == -EMSGSIZE)
4372339e
JD		 812 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
813 htonl(mtu));
c12b395a 814 return -1;
815 }
816
817 return 0;
818}
819
820static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
821{
822 struct ip6_tnl *t = netdev_priv(dev);
823 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
824 int encap_limit = -1;
c12b395a 825 struct flowi6 fl6;
6712abc1 826 __u8 dsfield = 0;
c12b395a 827 __u32 mtu;
828 int err;
829
830 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
831 return -1;
832
6712abc1
WT		 833 if (!t->parms.collect_md &&
834 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
898b2979 835 return -1;
e2d118a1 836
b05229f4
TH		 837 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
838 return -1;
839
840 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
841 &mtu, skb->protocol);
c12b395a 842 if (err != 0) {
843 if (err == -EMSGSIZE)
4372339e 844 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
c12b395a 845 return -1;
846 }
847
848 return 0;
849}
850
851/**
7ccbdff1 852 * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own
c12b395a 853 * @t: the outgoing tunnel device
854 * @hdr: IPv6 header from the incoming packet
855 *
856 * Description:
857 * Avoid trivial tunneling loop by checking that tunnel exit-point
858 * doesn't match source of incoming packet.
859 *
860 * Return:
861 * 1 if conflict,
862 * 0 else
863 **/
864
865static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
866 const struct ipv6hdr *hdr)
867{
868 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
869}
870
871static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
872{
873 struct ip6_tnl *t = netdev_priv(dev);
874 int encap_limit = -1;
875 struct flowi6 fl6;
876 __u32 mtu;
877 int err;
878
879 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
880 encap_limit = t->parms.encap_limit;
881
6712abc1
WT		 882 if (!t->parms.collect_md)
883 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
c12b395a 884
b05229f4
TH		 885 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
886 if (err)
887 return err;
888
889 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
c12b395a 890
891 return err;
892}
893
894static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
895 struct net_device *dev)
896{
897 struct ip6_tnl *t = netdev_priv(dev);
898 struct net_device_stats *stats = &t->dev->stats;
899 int ret;
900
cb9f1b78
WB		 901 if (!pskb_inet_may_pull(skb))
902 goto tx_err;
903
d5005140 904 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
41ab3e31 905 goto tx_err;
c12b395a 906
907 switch (skb->protocol) {
908 case htons(ETH_P_IP):
909 ret = ip6gre_xmit_ipv4(skb, dev);
910 break;
911 case htons(ETH_P_IPV6):
912 ret = ip6gre_xmit_ipv6(skb, dev);
913 break;
914 default:
915 ret = ip6gre_xmit_other(skb, dev);
916 break;
917 }
918
919 if (ret < 0)
920 goto tx_err;
921
922 return NETDEV_TX_OK;
923
924tx_err:
e5f7e211
DC		 925 if (!t->parms.collect_md || !IS_ERR(skb_tunnel_info_txcheck(skb)))
926 stats->tx_errors++;
c12b395a 927 stats->tx_dropped++;
928 kfree_skb(skb);
929 return NETDEV_TX_OK;
930}
931
5a963eb6
WT		 932static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
933 struct net_device *dev)
934{
e5f7e211 935 struct ip_tunnel_info *tun_info = NULL;
5a963eb6
WT		 936 struct ip6_tnl *t = netdev_priv(dev);
937 struct dst_entry *dst = skb_dst(skb);
938 struct net_device_stats *stats;
939 bool truncate = false;
940 int encap_limit = -1;
941 __u8 dsfield = false;
942 struct flowi6 fl6;
943 int err = -EINVAL;
20704bd1 944 __be16 proto;
5a963eb6 945 __u32 mtu;
1baf5ebf 946 int nhoff;
d5db21a3 947 int thoff;
5a963eb6 948
cb9f1b78
WB		 949 if (!pskb_inet_may_pull(skb))
950 goto tx_err;
951
5a963eb6
WT		 952 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
953 goto tx_err;
954
955 if (gre_handle_offloads(skb, false))
956 goto tx_err;
957
5a963eb6
WT		 958 if (skb->len > dev->mtu + dev->hard_header_len) {
959 pskb_trim(skb, dev->mtu + dev->hard_header_len);
960 truncate = true;
961 }
962
1baf5ebf
WT		 963 nhoff = skb_network_header(skb) - skb_mac_header(skb);
964 if (skb->protocol == htons(ETH_P_IP) &&
965 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
966 truncate = true;
967
d5db21a3
WT		 968 thoff = skb_transport_header(skb) - skb_mac_header(skb);
969 if (skb->protocol == htons(ETH_P_IPV6) &&
970 (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff))
971 truncate = true;
972
5691484d 973 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
e41c7c68
WT		 974 goto tx_err;
975
5a963eb6 976 t->parms.o_flags &= ~TUNNEL_KEY;
5a963eb6 977 IPCB(skb)->flags = 0;
ef7baf5e
WT		 978
979 /* For collect_md mode, derive fl6 from the tunnel key,
980 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
981 */
982 if (t->parms.collect_md) {
ef7baf5e
WT		 983 const struct ip_tunnel_key *key;
984 struct erspan_metadata *md;
c69de58b 985 __be32 tun_id;
ef7baf5e 986
e5f7e211
DC		 987 tun_info = skb_tunnel_info_txcheck(skb);
988 if (IS_ERR(tun_info) ||
989 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
28e48603 990 goto tx_err;
ef7baf5e
WT		 991
992 key = &tun_info->key;
993 memset(&fl6, 0, sizeof(fl6));
994 fl6.flowi6_proto = IPPROTO_GRE;
995 fl6.daddr = key->u.ipv6.dst;
996 fl6.flowlabel = key->label;
997 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
bcf141b2 998 fl6.fl6_gre_key = tunnel_id_to_key32(key->tun_id);
ef7baf5e
WT		 999
1000 dsfield = key->tos;
256c87c1
PJV		 1001 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
1002 goto tx_err;
2eb8d6d2 1003 if (tun_info->options_len < sizeof(*md))
ef7baf5e 1004 goto tx_err;
2eb8d6d2 1005 md = ip_tunnel_info_opts(tun_info);
ef7baf5e 1006
c69de58b 1007 tun_id = tunnel_id_to_key32(key->tun_id);
94d7d8f2
WT		 1008 if (md->version == 1) {
1009 erspan_build_header(skb,
c69de58b 1010 ntohl(tun_id),
94d7d8f2
WT		 1011 ntohl(md->u.index), truncate,
1012 false);
1013 } else if (md->version == 2) {
94d7d8f2 1014 erspan_build_header_v2(skb,
c69de58b
WT		 1015 ntohl(tun_id),
1016 md->u.md2.dir,
1017 get_hwid(&md->u.md2),
1018 truncate, false);
d6aa7119
WT		 1019 } else {
1020 goto tx_err;
94d7d8f2 1021 }
ef7baf5e
WT		 1022 } else {
1023 switch (skb->protocol) {
1024 case htons(ETH_P_IP):
1025 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1026 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1027 &dsfield, &encap_limit);
1028 break;
1029 case htons(ETH_P_IPV6):
cb9f1b78 1030 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
ef7baf5e
WT		 1031 goto tx_err;
1032 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1033 &dsfield, &encap_limit))
1034 goto tx_err;
1035 break;
1036 default:
1037 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1038 break;
1039 }
1040
94d7d8f2 1041 if (t->parms.erspan_ver == 1)
c69de58b 1042 erspan_build_header(skb, ntohl(t->parms.o_key),
94d7d8f2
WT		 1043 t->parms.index,
1044 truncate, false);
02f99df1 1045 else if (t->parms.erspan_ver == 2)
c69de58b 1046 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
94d7d8f2
WT		 1047 t->parms.dir,
1048 t->parms.hwid,
1049 truncate, false);
02f99df1
WT		 1050 else
1051 goto tx_err;
1052
ef7baf5e
WT		 1053 fl6.daddr = t->parms.raddr;
1054 }
5a963eb6
WT		 1055
1056 /* Push GRE header. */
20704bd1
XL		 1057 proto = (t->parms.erspan_ver == 1) ? htons(ETH_P_ERSPAN)
1058 : htons(ETH_P_ERSPAN2);
31c417c9 1059 gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(atomic_fetch_inc(&t->o_seqno)));
5a963eb6
WT		 1060
1061 /* TooBig packet may have updated dst->dev's mtu */
ef7baf5e 1062 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
675d76ad 1063 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false);
5a963eb6
WT		 1064
1065 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1066 NEXTHDR_GRE);
1067 if (err != 0) {
1068 /* XXX: send ICMP error even if DF is not set. */
1069 if (err == -EMSGSIZE) {
1070 if (skb->protocol == htons(ETH_P_IP))
4372339e
JD		 1071 icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1072 ICMP_FRAG_NEEDED, htonl(mtu));
5a963eb6 1073 else
4372339e 1074 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
5a963eb6
WT		 1075 }
1076
1077 goto tx_err;
1078 }
1079 return NETDEV_TX_OK;
1080
1081tx_err:
1082 stats = &t->dev->stats;
e5f7e211
DC		 1083 if (!IS_ERR(tun_info))
1084 stats->tx_errors++;
5a963eb6
WT		 1085 stats->tx_dropped++;
1086 kfree_skb(skb);
1087 return NETDEV_TX_OK;
1088}
1089
a483373e 1090static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
c12b395a 1091{
1092 struct net_device *dev = t->dev;
1093 struct __ip6_tnl_parm *p = &t->parms;
1094 struct flowi6 *fl6 = &t->fl.u.ip6;
c12b395a 1095
1096 if (dev->type != ARPHRD_ETHER) {
5a1b7e1a 1097 __dev_addr_set(dev, &p->laddr, sizeof(struct in6_addr));
c12b395a 1098 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1099 }
1100
1101 /* Set up flowi template */
1102 fl6->saddr = p->laddr;
1103 fl6->daddr = p->raddr;
1104 fl6->flowi6_oif = p->link;
1105 fl6->flowlabel = 0;
252f3f5a 1106 fl6->flowi6_proto = IPPROTO_GRE;
bcf141b2 1107 fl6->fl6_gre_key = t->parms.o_key;
c12b395a 1108
1109 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1110 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1111 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1112 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1113
1114 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1115 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1116
1117 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1118 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1119 dev->flags |= IFF_POINTOPOINT;
1120 else
1121 dev->flags &= ~IFF_POINTOPOINT;
a483373e 1122}
c12b395a 1123
a483373e
PM		 1124static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1125 int t_hlen)
1126{
1127 const struct __ip6_tnl_parm *p = &t->parms;
1128 struct net_device *dev = t->dev;
c12b395a 1129
1130 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1131 int strict = (ipv6_addr_type(&p->raddr) &
1132 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1133
22f08069 1134 struct rt6_info *rt = rt6_lookup(t->net,
c12b395a 1135 &p->raddr, &p->laddr,
b75cc8f9 1136 p->link, NULL, strict);
c12b395a 1137
63159f29 1138 if (!rt)
c12b395a 1139 return;
1140
1141 if (rt->dst.dev) {
832ba596
AT		 1142 unsigned short dst_len = rt->dst.dev->hard_header_len +
1143 t_hlen;
1144
1145 if (t->dev->header_ops)
1146 dev->hard_header_len = dst_len;
1147 else
1148 dev->needed_headroom = dst_len;
c12b395a 1149
1150 if (set_mtu) {
db2ec95d 1151 dev->mtu = rt->dst.dev->mtu - t_hlen;
c12b395a 1152 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1153 dev->mtu -= 8;
a9e242ca
AD		 1154 if (dev->type == ARPHRD_ETHER)
1155 dev->mtu -= ETH_HLEN;
c12b395a 1156
1157 if (dev->mtu < IPV6_MIN_MTU)
1158 dev->mtu = IPV6_MIN_MTU;
1159 }
1160 }
94e187c0 1161 ip6_rt_put(rt);
c12b395a 1162 }
c12b395a 1163}
1164
a483373e
PM		 1165static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1166{
1167 int t_hlen;
1168
1169 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1170 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1171
1172 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
832ba596
AT		 1173
1174 if (tunnel->dev->header_ops)
1175 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1176 else
1177 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1178
a483373e
PM		 1179 return t_hlen;
1180}
1181
1182static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1183{
1184 ip6gre_tnl_link_config_common(t);
1185 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1186}
1187
a6465350
PM		 1188static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1189 const struct __ip6_tnl_parm *p)
c12b395a 1190{
1191 t->parms.laddr = p->laddr;
1192 t->parms.raddr = p->raddr;
1193 t->parms.flags = p->flags;
1194 t->parms.hop_limit = p->hop_limit;
1195 t->parms.encap_limit = p->encap_limit;
1196 t->parms.flowinfo = p->flowinfo;
1197 t->parms.link = p->link;
1198 t->parms.proto = p->proto;
1199 t->parms.i_key = p->i_key;
1200 t->parms.o_key = p->o_key;
1201 t->parms.i_flags = p->i_flags;
1202 t->parms.o_flags = p->o_flags;
0a473b82 1203 t->parms.fwmark = p->fwmark;
80b3671e
HL		 1204 t->parms.erspan_ver = p->erspan_ver;
1205 t->parms.index = p->index;
1206 t->parms.dir = p->dir;
1207 t->parms.hwid = p->hwid;
607f725f 1208 dst_cache_reset(&t->dst_cache);
a6465350
PM		 1209}
1210
1211static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1212 int set_mtu)
1213{
1214 ip6gre_tnl_copy_tnl_parm(t, p);
c12b395a 1215 ip6gre_tnl_link_config(t, set_mtu);
1216 return 0;
1217}
1218
1219static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1220 const struct ip6_tnl_parm2 *u)
1221{
1222 p->laddr = u->laddr;
1223 p->raddr = u->raddr;
1224 p->flags = u->flags;
1225 p->hop_limit = u->hop_limit;
1226 p->encap_limit = u->encap_limit;
1227 p->flowinfo = u->flowinfo;
1228 p->link = u->link;
1229 p->i_key = u->i_key;
1230 p->o_key = u->o_key;
f41fe3c2
TH		 1231 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1232 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
c12b395a 1233 memcpy(p->name, u->name, sizeof(u->name));
1234}
1235
1236static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1237 const struct __ip6_tnl_parm *p)
1238{
1239 u->proto = IPPROTO_GRE;
1240 u->laddr = p->laddr;
1241 u->raddr = p->raddr;
1242 u->flags = p->flags;
1243 u->hop_limit = p->hop_limit;
1244 u->encap_limit = p->encap_limit;
1245 u->flowinfo = p->flowinfo;
1246 u->link = p->link;
1247 u->i_key = p->i_key;
1248 u->o_key = p->o_key;
f41fe3c2
TH		 1249 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1250 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
c12b395a 1251 memcpy(u->name, p->name, sizeof(u->name));
1252}
1253
3e7a1c7c
AB		 1254static int ip6gre_tunnel_siocdevprivate(struct net_device *dev,
1255 struct ifreq *ifr, void __user *data,
1256 int cmd)
c12b395a 1257{
1258 int err = 0;
1259 struct ip6_tnl_parm2 p;
1260 struct __ip6_tnl_parm p1;
22f08069
ND		 1261 struct ip6_tnl *t = netdev_priv(dev);
1262 struct net *net = t->net;
c12b395a 1263 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1264
308edfdf
TH		 1265 memset(&p1, 0, sizeof(p1));
1266
c12b395a 1267 switch (cmd) {
1268 case SIOCGETTUNNEL:
c12b395a 1269 if (dev == ign->fb_tunnel_dev) {
3e7a1c7c 1270 if (copy_from_user(&p, data, sizeof(p))) {
c12b395a 1271 err = -EFAULT;
1272 break;
1273 }
1274 ip6gre_tnl_parm_from_user(&p1, &p);
1275 t = ip6gre_tunnel_locate(net, &p1, 0);
63159f29 1276 if (!t)
22f08069 1277 t = netdev_priv(dev);
c12b395a 1278 }
5dbd5068 1279 memset(&p, 0, sizeof(p));
c12b395a 1280 ip6gre_tnl_parm_to_user(&p, &t->parms);
3e7a1c7c 1281 if (copy_to_user(data, &p, sizeof(p)))
c12b395a 1282 err = -EFAULT;
1283 break;
1284
1285 case SIOCADDTUNNEL:
1286 case SIOCCHGTUNNEL:
1287 err = -EPERM;
af31f412 1288 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
c12b395a 1289 goto done;
1290
1291 err = -EFAULT;
3e7a1c7c 1292 if (copy_from_user(&p, data, sizeof(p)))
c12b395a 1293 goto done;
1294
1295 err = -EINVAL;
1296 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1297 goto done;
1298
1299 if (!(p.i_flags&GRE_KEY))
1300 p.i_key = 0;
1301 if (!(p.o_flags&GRE_KEY))
1302 p.o_key = 0;
1303
1304 ip6gre_tnl_parm_from_user(&p1, &p);
1305 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1306
1307 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
53b24b8f 1308 if (t) {
c12b395a 1309 if (t->dev != dev) {
1310 err = -EEXIST;
1311 break;
1312 }
1313 } else {
1314 t = netdev_priv(dev);
1315
1316 ip6gre_tunnel_unlink(ign, t);
1317 synchronize_net();
1318 ip6gre_tnl_change(t, &p1, 1);
1319 ip6gre_tunnel_link(ign, t);
1320 netdev_state_change(dev);
1321 }
1322 }
1323
1324 if (t) {
1325 err = 0;
1326
5dbd5068 1327 memset(&p, 0, sizeof(p));
c12b395a 1328 ip6gre_tnl_parm_to_user(&p, &t->parms);
3e7a1c7c 1329 if (copy_to_user(data, &p, sizeof(p)))
c12b395a 1330 err = -EFAULT;
1331 } else
1332 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1333 break;
1334
1335 case SIOCDELTUNNEL:
1336 err = -EPERM;
af31f412 1337 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
c12b395a 1338 goto done;
1339
1340 if (dev == ign->fb_tunnel_dev) {
1341 err = -EFAULT;
3e7a1c7c 1342 if (copy_from_user(&p, data, sizeof(p)))
c12b395a 1343 goto done;
1344 err = -ENOENT;
1345 ip6gre_tnl_parm_from_user(&p1, &p);
1346 t = ip6gre_tunnel_locate(net, &p1, 0);
63159f29 1347 if (!t)
c12b395a 1348 goto done;
1349 err = -EPERM;
1350 if (t == netdev_priv(ign->fb_tunnel_dev))
1351 goto done;
1352 dev = t->dev;
1353 }
1354 unregister_netdevice(dev);
1355 err = 0;
1356 break;
1357
1358 default:
1359 err = -EINVAL;
1360 }
1361
1362done:
1363 return err;
1364}
1365
c12b395a 1366static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
76cc0d32
XL		 1367 unsigned short type, const void *daddr,
1368 const void *saddr, unsigned int len)
c12b395a 1369{
1370 struct ip6_tnl *t = netdev_priv(dev);
76cc0d32
XL		 1371 struct ipv6hdr *ipv6h;
1372 __be16 *p;
c12b395a 1373
76cc0d32
XL		 1374 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1375 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1376 t->fl.u.ip6.flowlabel,
1377 true, &t->fl.u.ip6));
c12b395a 1378 ipv6h->hop_limit = t->parms.hop_limit;
1379 ipv6h->nexthdr = NEXTHDR_GRE;
1380 ipv6h->saddr = t->parms.laddr;
1381 ipv6h->daddr = t->parms.raddr;
1382
76cc0d32
XL		 1383 p = (__be16 *)(ipv6h + 1);
1384 p[0] = t->parms.o_flags;
1385 p[1] = htons(type);
c12b395a 1386
1387 /*
1388 * Set the source hardware address.
1389 */
1390
1391 if (saddr)
1392 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1393 if (daddr)
1394 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1395 if (!ipv6_addr_any(&ipv6h->daddr))
1396 return t->hlen;
1397
1398 return -t->hlen;
1399}
1400
c12b395a 1401static const struct header_ops ip6gre_header_ops = {
1402 .create = ip6gre_header,
c12b395a 1403};
1404
1405static const struct net_device_ops ip6gre_netdev_ops = {
1406 .ndo_init = ip6gre_tunnel_init,
1407 .ndo_uninit = ip6gre_tunnel_uninit,
1408 .ndo_start_xmit = ip6gre_tunnel_xmit,
3e7a1c7c 1409 .ndo_siocdevprivate = ip6gre_tunnel_siocdevprivate,
b05229f4 1410 .ndo_change_mtu = ip6_tnl_change_mtu,
98d7fc46 1411 .ndo_get_stats64 = dev_get_tstats64,
ecf2c06a 1412 .ndo_get_iflink = ip6_tnl_get_iflink,
c12b395a 1413};
1414
1415static void ip6gre_dev_free(struct net_device *dev)
1416{
cdf3464e
MKL		 1417 struct ip6_tnl *t = netdev_priv(dev);
1418
0c1dd2a1 1419 gro_cells_destroy(&t->gro_cells);
607f725f 1420 dst_cache_destroy(&t->dst_cache);
c12b395a 1421 free_percpu(dev->tstats);
c12b395a 1422}
1423
1424static void ip6gre_tunnel_setup(struct net_device *dev)
1425{
c12b395a 1426 dev->netdev_ops = &ip6gre_netdev_ops;
cf124db5
DM		 1427 dev->needs_free_netdev = true;
1428 dev->priv_destructor = ip6gre_dev_free;
c12b395a 1429
1430 dev->type = ARPHRD_IP6GRE;
b05229f4 1431
c12b395a 1432 dev->flags |= IFF_NOARP;
c12b395a 1433 dev->addr_len = sizeof(struct in6_addr);
02875878 1434 netif_keep_dst(dev);
45ce0fd1
FJ		 1435 /* This perm addr will be used as interface identifier by IPv6 */
1436 dev->addr_assign_type = NET_ADDR_RANDOM;
1437 eth_random_addr(dev->perm_addr);
c12b395a 1438}
1439
e5a9336a
AK		 1440#define GRE6_FEATURES (NETIF_F_SG | \
1441 NETIF_F_FRAGLIST | \
1442 NETIF_F_HIGHDMA | \
1443 NETIF_F_HW_CSUM)
1444
1445static void ip6gre_tnl_init_features(struct net_device *dev)
1446{
1447 struct ip6_tnl *nt = netdev_priv(dev);
1448
1449 dev->features |= GRE6_FEATURES;
1450 dev->hw_features |= GRE6_FEATURES;
1451
1452 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1453 /* TCP offload with GRE SEQ is not supported, nor
1454 * can we support 2 levels of outer headers requiring
1455 * an update.
1456 */
1457 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1458 nt->encap.type == TUNNEL_ENCAP_NONE) {
1459 dev->features |= NETIF_F_GSO_SOFTWARE;
1460 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1461 }
1462
1463 /* Can use a lockless transmit, unless we generate
1464 * output sequences
1465 */
1466 dev->features |= NETIF_F_LLTX;
1467 }
1468}
1469
a3c119d3 1470static int ip6gre_tunnel_init_common(struct net_device *dev)
c12b395a 1471{
1472 struct ip6_tnl *tunnel;
cdf3464e 1473 int ret;
b05229f4 1474 int t_hlen;
c12b395a 1475
1476 tunnel = netdev_priv(dev);
1477
1478 tunnel->dev = dev;
0bd87628 1479 tunnel->net = dev_net(dev);
c12b395a 1480 strcpy(tunnel->parms.name, dev->name);
1481
a3c119d3
MKL		 1482 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1483 if (!dev->tstats)
1484 return -ENOMEM;
1485
607f725f 1486 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
0c1dd2a1
EBE		 1487 if (ret)
1488 goto cleanup_alloc_pcpu_stats;
1489
1490 ret = gro_cells_init(&tunnel->gro_cells, dev);
1491 if (ret)
1492 goto cleanup_dst_cache_init;
cdf3464e 1493
a483373e 1494 t_hlen = ip6gre_calc_hlen(tunnel);
db2ec95d 1495 dev->mtu = ETH_DATA_LEN - t_hlen;
1b227e53
HY		 1496 if (dev->type == ARPHRD_ETHER)
1497 dev->mtu -= ETH_HLEN;
b05229f4
TH		 1498 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1499 dev->mtu -= 8;
1500
6712abc1 1501 if (tunnel->parms.collect_md) {
6712abc1
WT		 1502 netif_keep_dst(dev);
1503 }
e5a9336a 1504 ip6gre_tnl_init_features(dev);
6712abc1 1505
56c1c779 1506 dev_hold_track(dev, &tunnel->dev_tracker, GFP_KERNEL);
a3c119d3 1507 return 0;
0c1dd2a1
EBE		 1508
1509cleanup_dst_cache_init:
1510 dst_cache_destroy(&tunnel->dst_cache);
1511cleanup_alloc_pcpu_stats:
1512 free_percpu(dev->tstats);
1513 dev->tstats = NULL;
1514 return ret;
a3c119d3
MKL		 1515}
1516
1517static int ip6gre_tunnel_init(struct net_device *dev)
1518{
1519 struct ip6_tnl *tunnel;
1520 int ret;
1521
1522 ret = ip6gre_tunnel_init_common(dev);
1523 if (ret)
1524 return ret;
1525
1526 tunnel = netdev_priv(dev);
1527
6712abc1
WT		 1528 if (tunnel->parms.collect_md)
1529 return 0;
1530
5a1b7e1a 1531 __dev_addr_set(dev, &tunnel->parms.laddr, sizeof(struct in6_addr));
c12b395a 1532 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1533
1534 if (ipv6_addr_any(&tunnel->parms.raddr))
1535 dev->header_ops = &ip6gre_header_ops;
1536
c12b395a 1537 return 0;
1538}
1539
1540static void ip6gre_fb_tunnel_init(struct net_device *dev)
1541{
1542 struct ip6_tnl *tunnel = netdev_priv(dev);
1543
1544 tunnel->dev = dev;
0bd87628 1545 tunnel->net = dev_net(dev);
c12b395a 1546 strcpy(tunnel->parms.name, dev->name);
1547
1548 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
c12b395a 1549}
1550
c12b395a 1551static struct inet6_protocol ip6gre_protocol __read_mostly = {
308edfdf 1552 .handler = gre_rcv,
c12b395a 1553 .err_handler = ip6gre_err,
bcf141b2 1554 .flags = INET6_PROTO_FINAL,
c12b395a 1555};
1556
22f08069 1557static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
c12b395a 1558{
22f08069
ND		 1559 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1560 struct net_device *dev, *aux;
c12b395a 1561 int prio;
1562
22f08069
ND		 1563 for_each_netdev_safe(net, dev, aux)
1564 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
5a963eb6
WT		 1565 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1566 dev->rtnl_link_ops == &ip6erspan_tap_ops)
22f08069
ND		 1567 unregister_netdevice_queue(dev, head);
1568
c12b395a 1569 for (prio = 0; prio < 4; prio++) {
1570 int h;
e87a8f24 1571 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
c12b395a 1572 struct ip6_tnl *t;
1573
1574 t = rtnl_dereference(ign->tunnels[prio][h]);
1575
53b24b8f 1576 while (t) {
22f08069
ND		 1577 /* If dev is in the same netns, it has already
1578 * been added to the list by the previous loop.
1579 */
1580 if (!net_eq(dev_net(t->dev), net))
1581 unregister_netdevice_queue(t->dev,
1582 head);
c12b395a 1583 t = rtnl_dereference(t->next);
1584 }
1585 }
1586 }
1587}
1588
1589static int __net_init ip6gre_init_net(struct net *net)
1590{
1591 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
46ef5b89 1592 struct net_device *ndev;
c12b395a 1593 int err;
1594
79134e6c
ED		 1595 if (!net_has_fallback_tunnels(net))
1596 return 0;
46ef5b89
WY		 1597 ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1598 NET_NAME_UNKNOWN, ip6gre_tunnel_setup);
1599 if (!ndev) {
c12b395a 1600 err = -ENOMEM;
1601 goto err_alloc_dev;
1602 }
46ef5b89 1603 ign->fb_tunnel_dev = ndev;
c12b395a 1604 dev_net_set(ign->fb_tunnel_dev, net);
22f08069
ND		 1605 /* FB netdevice is special: we have one, and only one per netns.
1606 * Allowing to move it to another netns is clearly unsafe.
1607 */
1608 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1609
c12b395a 1610
1611 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1612 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1613
1614 err = register_netdev(ign->fb_tunnel_dev);
1615 if (err)
1616 goto err_reg_dev;
1617
1618 rcu_assign_pointer(ign->tunnels_wc[0],
1619 netdev_priv(ign->fb_tunnel_dev));
1620 return 0;
1621
1622err_reg_dev:
46ef5b89 1623 free_netdev(ndev);
c12b395a 1624err_alloc_dev:
1625 return err;
1626}
1627
bb401cae 1628static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
c12b395a 1629{
bb401cae 1630 struct net *net;
c12b395a 1631 LIST_HEAD(list);
1632
c12b395a 1633 rtnl_lock();
bb401cae
ED		 1634 list_for_each_entry(net, net_list, exit_list)
1635 ip6gre_destroy_tunnels(net, &list);
c12b395a 1636 unregister_netdevice_many(&list);
1637 rtnl_unlock();
1638}
1639
1640static struct pernet_operations ip6gre_net_ops = {
1641 .init = ip6gre_init_net,
bb401cae 1642 .exit_batch = ip6gre_exit_batch_net,
c12b395a 1643 .id = &ip6gre_net_id,
1644 .size = sizeof(struct ip6gre_net),
1645};
1646
a8b8a889
MS		 1647static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1648 struct netlink_ext_ack *extack)
c12b395a 1649{
1650 __be16 flags;
1651
1652 if (!data)
1653 return 0;
1654
1655 flags = 0;
1656 if (data[IFLA_GRE_IFLAGS])
1657 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1658 if (data[IFLA_GRE_OFLAGS])
1659 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1660 if (flags & (GRE_VERSION|GRE_ROUTING))
1661 return -EINVAL;
1662
1663 return 0;
1664}
1665
a8b8a889
MS		 1666static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1667 struct netlink_ext_ack *extack)
c12b395a 1668{
1669 struct in6_addr daddr;
1670
1671 if (tb[IFLA_ADDRESS]) {
1672 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1673 return -EINVAL;
1674 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1675 return -EADDRNOTAVAIL;
1676 }
1677
1678 if (!data)
1679 goto out;
1680
1681 if (data[IFLA_GRE_REMOTE]) {
67b61f6c 1682 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
c12b395a 1683 if (ipv6_addr_any(&daddr))
1684 return -EINVAL;
1685 }
1686
1687out:
a8b8a889 1688 return ip6gre_tunnel_validate(tb, data, extack);
c12b395a 1689}
1690
5a963eb6
WT		 1691static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1692 struct netlink_ext_ack *extack)
1693{
1694 __be16 flags = 0;
94d7d8f2 1695 int ret, ver = 0;
5a963eb6
WT		 1696
1697 if (!data)
1698 return 0;
1699
1700 ret = ip6gre_tap_validate(tb, data, extack);
1701 if (ret)
1702 return ret;
1703
1704 /* ERSPAN should only have GRE sequence and key flag */
1705 if (data[IFLA_GRE_OFLAGS])
1706 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1707 if (data[IFLA_GRE_IFLAGS])
1708 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1709 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1710 flags != (GRE_SEQ | GRE_KEY))
1711 return -EINVAL;
1712
1713 /* ERSPAN Session ID only has 10-bit. Since we reuse
1714 * 32-bit key field as ID, check it's range.
1715 */
1716 if (data[IFLA_GRE_IKEY] &&
1717 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1718 return -EINVAL;
1719
1720 if (data[IFLA_GRE_OKEY] &&
1721 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1722 return -EINVAL;
1723
94d7d8f2
WT		 1724 if (data[IFLA_GRE_ERSPAN_VER]) {
1725 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1726 if (ver != 1 && ver != 2)
5a963eb6
WT		 1727 return -EINVAL;
1728 }
94d7d8f2
WT		 1729
1730 if (ver == 1) {
1731 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1732 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1733
1734 if (index & ~INDEX_MASK)
1735 return -EINVAL;
1736 }
1737 } else if (ver == 2) {
1738 if (data[IFLA_GRE_ERSPAN_DIR]) {
1739 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1740
1741 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1742 return -EINVAL;
1743 }
1744
1745 if (data[IFLA_GRE_ERSPAN_HWID]) {
1746 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1747
1748 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1749 return -EINVAL;
1750 }
1751 }
1752
5a963eb6
WT		 1753 return 0;
1754}
c12b395a 1755
4974d5f6
LB		 1756static void ip6erspan_set_version(struct nlattr *data[],
1757 struct __ip6_tnl_parm *parms)
1758{
efcc9bca
LB		 1759 if (!data)
1760 return;
1761
4974d5f6
LB		 1762 parms->erspan_ver = 1;
1763 if (data[IFLA_GRE_ERSPAN_VER])
1764 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1765
1766 if (parms->erspan_ver == 1) {
1767 if (data[IFLA_GRE_ERSPAN_INDEX])
1768 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1769 } else if (parms->erspan_ver == 2) {
1770 if (data[IFLA_GRE_ERSPAN_DIR])
1771 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1772 if (data[IFLA_GRE_ERSPAN_HWID])
1773 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1774 }
1775}
1776
c12b395a 1777static void ip6gre_netlink_parms(struct nlattr *data[],
1778 struct __ip6_tnl_parm *parms)
1779{
1780 memset(parms, 0, sizeof(*parms));
1781
1782 if (!data)
1783 return;
1784
1785 if (data[IFLA_GRE_LINK])
1786 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1787
1788 if (data[IFLA_GRE_IFLAGS])
f41fe3c2
TH		 1789 parms->i_flags = gre_flags_to_tnl_flags(
1790 nla_get_be16(data[IFLA_GRE_IFLAGS]));
c12b395a 1791
1792 if (data[IFLA_GRE_OFLAGS])
f41fe3c2
TH		 1793 parms->o_flags = gre_flags_to_tnl_flags(
1794 nla_get_be16(data[IFLA_GRE_OFLAGS]));
c12b395a 1795
1796 if (data[IFLA_GRE_IKEY])
1797 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1798
1799 if (data[IFLA_GRE_OKEY])
1800 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1801
1802 if (data[IFLA_GRE_LOCAL])
67b61f6c 1803 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
c12b395a 1804
1805 if (data[IFLA_GRE_REMOTE])
67b61f6c 1806 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
c12b395a 1807
1808 if (data[IFLA_GRE_TTL])
1809 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1810
1811 if (data[IFLA_GRE_ENCAP_LIMIT])
1812 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1813
1814 if (data[IFLA_GRE_FLOWINFO])
c2675de4 1815 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
c12b395a 1816
1817 if (data[IFLA_GRE_FLAGS])
1818 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
0a473b82
CG		 1819
1820 if (data[IFLA_GRE_FWMARK])
1821 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
5a963eb6 1822
6712abc1
WT		 1823 if (data[IFLA_GRE_COLLECT_METADATA])
1824 parms->collect_md = true;
c12b395a 1825}
1826
1827static int ip6gre_tap_init(struct net_device *dev)
1828{
a3c119d3 1829 int ret;
c12b395a 1830
a3c119d3
MKL		 1831 ret = ip6gre_tunnel_init_common(dev);
1832 if (ret)
1833 return ret;
c12b395a 1834
0a46baaf
SC		 1835 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1836
c12b395a 1837 return 0;
1838}
1839
1840static const struct net_device_ops ip6gre_tap_netdev_ops = {
1841 .ndo_init = ip6gre_tap_init,
1842 .ndo_uninit = ip6gre_tunnel_uninit,
1843 .ndo_start_xmit = ip6gre_tunnel_xmit,
1844 .ndo_set_mac_address = eth_mac_addr,
1845 .ndo_validate_addr = eth_validate_addr,
b05229f4 1846 .ndo_change_mtu = ip6_tnl_change_mtu,
98d7fc46 1847 .ndo_get_stats64 = dev_get_tstats64,
ecf2c06a 1848 .ndo_get_iflink = ip6_tnl_get_iflink,
c12b395a 1849};
1850
2d665034
PM		 1851static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1852{
1853 int t_hlen;
1854
1855 tunnel->tun_hlen = 8;
1856 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1857 erspan_hdr_len(tunnel->parms.erspan_ver);
1858
1859 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
eb95f52f 1860 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
2d665034
PM		 1861 return t_hlen;
1862}
1863
5a963eb6
WT		 1864static int ip6erspan_tap_init(struct net_device *dev)
1865{
1866 struct ip6_tnl *tunnel;
1867 int t_hlen;
1868 int ret;
1869
1870 tunnel = netdev_priv(dev);
1871
1872 tunnel->dev = dev;
1873 tunnel->net = dev_net(dev);
1874 strcpy(tunnel->parms.name, dev->name);
1875
1876 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1877 if (!dev->tstats)
1878 return -ENOMEM;
1879
1880 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
0c1dd2a1
EBE		 1881 if (ret)
1882 goto cleanup_alloc_pcpu_stats;
1883
1884 ret = gro_cells_init(&tunnel->gro_cells, dev);
1885 if (ret)
1886 goto cleanup_dst_cache_init;
5a963eb6 1887
2d665034 1888 t_hlen = ip6erspan_calc_hlen(tunnel);
5a963eb6
WT		 1889 dev->mtu = ETH_DATA_LEN - t_hlen;
1890 if (dev->type == ARPHRD_ETHER)
1891 dev->mtu -= ETH_HLEN;
1892 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1893 dev->mtu -= 8;
1894
1895 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2d665034 1896 ip6erspan_tnl_link_config(tunnel, 1);
5a963eb6 1897
56c1c779 1898 dev_hold_track(dev, &tunnel->dev_tracker, GFP_KERNEL);
5a963eb6 1899 return 0;
0c1dd2a1
EBE		 1900
1901cleanup_dst_cache_init:
1902 dst_cache_destroy(&tunnel->dst_cache);
1903cleanup_alloc_pcpu_stats:
1904 free_percpu(dev->tstats);
1905 dev->tstats = NULL;
1906 return ret;
5a963eb6
WT		 1907}
1908
1909static const struct net_device_ops ip6erspan_netdev_ops = {
1910 .ndo_init = ip6erspan_tap_init,
b80d0b93 1911 .ndo_uninit = ip6erspan_tunnel_uninit,
5a963eb6
WT		 1912 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1913 .ndo_set_mac_address = eth_mac_addr,
1914 .ndo_validate_addr = eth_validate_addr,
1915 .ndo_change_mtu = ip6_tnl_change_mtu,
98d7fc46 1916 .ndo_get_stats64 = dev_get_tstats64,
5a963eb6
WT		 1917 .ndo_get_iflink = ip6_tnl_get_iflink,
1918};
1919
c12b395a 1920static void ip6gre_tap_setup(struct net_device *dev)
1921{
1922
1923 ether_setup(dev);
1924
2c52129a 1925 dev->max_mtu = 0;
c12b395a 1926 dev->netdev_ops = &ip6gre_tap_netdev_ops;
cf124db5
DM		 1927 dev->needs_free_netdev = true;
1928 dev->priv_destructor = ip6gre_dev_free;
c12b395a 1929
d13b161c 1930 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
0a46baaf 1931 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2d40557c 1932 netif_keep_dst(dev);
c12b395a 1933}
1934
1faf3d9f
TH		 1935static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1936 struct ip_tunnel_encap *ipencap)
1937{
1938 bool ret = false;
1939
1940 memset(ipencap, 0, sizeof(*ipencap));
1941
1942 if (!data)
1943 return ret;
1944
1945 if (data[IFLA_GRE_ENCAP_TYPE]) {
1946 ret = true;
1947 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1948 }
1949
1950 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1951 ret = true;
1952 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1953 }
1954
1955 if (data[IFLA_GRE_ENCAP_SPORT]) {
1956 ret = true;
1957 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1958 }
1959
1960 if (data[IFLA_GRE_ENCAP_DPORT]) {
1961 ret = true;
1962 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1963 }
1964
1965 return ret;
1966}
1967
7fa38a7c
PM		 1968static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1969 struct nlattr *tb[], struct nlattr *data[],
1970 struct netlink_ext_ack *extack)
c12b395a 1971{
1972 struct ip6_tnl *nt;
1faf3d9f 1973 struct ip_tunnel_encap ipencap;
c12b395a 1974 int err;
1975
1976 nt = netdev_priv(dev);
1faf3d9f
TH		 1977
1978 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1979 int err = ip6_tnl_encap_setup(nt, &ipencap);
1980
1981 if (err < 0)
1982 return err;
1983 }
1984
c12b395a 1985 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1986 eth_hw_addr_random(dev);
1987
1988 nt->dev = dev;
0bd87628 1989 nt->net = dev_net(dev);
c12b395a 1990
c12b395a 1991 err = register_netdevice(dev);
1992 if (err)
1993 goto out;
1994
128bb975
AK		 1995 if (tb[IFLA_MTU])
1996 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1997
c12b395a 1998out:
1999 return err;
2000}
2001
7fa38a7c
PM		 2002static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
2003 struct nlattr *tb[], struct nlattr *data[],
2004 struct netlink_ext_ack *extack)
2005{
7fa38a7c
PM		 2006 struct ip6_tnl *nt = netdev_priv(dev);
2007 struct net *net = dev_net(dev);
b80d0b93
WT		 2008 struct ip6gre_net *ign;
2009 int err;
2010
2011 ip6gre_netlink_parms(data, &nt->parms);
2012 ign = net_generic(net, ip6gre_net_id);
2013
2014 if (nt->parms.collect_md) {
2015 if (rtnl_dereference(ign->collect_md_tun))
2016 return -EEXIST;
2017 } else {
2018 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2019 return -EEXIST;
2020 }
7fa38a7c 2021
b80d0b93 2022 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
7fa38a7c
PM		 2023 if (!err) {
2024 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
b80d0b93 2025 ip6gre_tunnel_link_md(ign, nt);
7fa38a7c
PM		 2026 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2027 }
2028 return err;
2029}
2030
c8632fc3
PM		 2031static struct ip6_tnl *
2032ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2033 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2034 struct netlink_ext_ack *extack)
c12b395a 2035{
22f08069
ND		 2036 struct ip6_tnl *t, *nt = netdev_priv(dev);
2037 struct net *net = nt->net;
c12b395a 2038 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1faf3d9f 2039 struct ip_tunnel_encap ipencap;
c12b395a 2040
2041 if (dev == ign->fb_tunnel_dev)
c8632fc3 2042 return ERR_PTR(-EINVAL);
c12b395a 2043
1faf3d9f
TH		 2044 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2045 int err = ip6_tnl_encap_setup(nt, &ipencap);
2046
2047 if (err < 0)
c8632fc3 2048 return ERR_PTR(err);
1faf3d9f
TH		 2049 }
2050
c8632fc3 2051 ip6gre_netlink_parms(data, p_p);
c12b395a 2052
c8632fc3 2053 t = ip6gre_tunnel_locate(net, p_p, 0);
c12b395a 2054
2055 if (t) {
2056 if (t->dev != dev)
c8632fc3 2057 return ERR_PTR(-EEXIST);
c12b395a 2058 } else {
2059 t = nt;
c12b395a 2060 }
2061
c8632fc3
PM		 2062 return t;
2063}
2064
2065static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2066 struct nlattr *data[],
2067 struct netlink_ext_ack *extack)
2068{
ab5098fa
OM		 2069 struct ip6_tnl *t = netdev_priv(dev);
2070 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
c8632fc3 2071 struct __ip6_tnl_parm p;
c8632fc3
PM		 2072
2073 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2074 if (IS_ERR(t))
2075 return PTR_ERR(t);
2076
b80d0b93 2077 ip6gre_tunnel_unlink_md(ign, t);
6a61d4db
ND		 2078 ip6gre_tunnel_unlink(ign, t);
2079 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
b80d0b93 2080 ip6gre_tunnel_link_md(ign, t);
6a61d4db 2081 ip6gre_tunnel_link(ign, t);
c12b395a 2082 return 0;
2083}
2084
54d63f78
ND		 2085static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2086{
2087 struct net *net = dev_net(dev);
2088 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2089
2090 if (dev != ign->fb_tunnel_dev)
2091 unregister_netdevice_queue(dev, head);
2092}
2093
c12b395a 2094static size_t ip6gre_get_size(const struct net_device *dev)
2095{
2096 return
2097 /* IFLA_GRE_LINK */
2098 nla_total_size(4) +
2099 /* IFLA_GRE_IFLAGS */
2100 nla_total_size(2) +
2101 /* IFLA_GRE_OFLAGS */
2102 nla_total_size(2) +
2103 /* IFLA_GRE_IKEY */
2104 nla_total_size(4) +
2105 /* IFLA_GRE_OKEY */
2106 nla_total_size(4) +
2107 /* IFLA_GRE_LOCAL */
a3754133 2108 nla_total_size(sizeof(struct in6_addr)) +
c12b395a 2109 /* IFLA_GRE_REMOTE */
a3754133 2110 nla_total_size(sizeof(struct in6_addr)) +
c12b395a 2111 /* IFLA_GRE_TTL */
2112 nla_total_size(1) +
c12b395a 2113 /* IFLA_GRE_ENCAP_LIMIT */
2114 nla_total_size(1) +
2115 /* IFLA_GRE_FLOWINFO */
2116 nla_total_size(4) +
2117 /* IFLA_GRE_FLAGS */
2118 nla_total_size(4) +
1faf3d9f
TH		 2119 /* IFLA_GRE_ENCAP_TYPE */
2120 nla_total_size(2) +
2121 /* IFLA_GRE_ENCAP_FLAGS */
2122 nla_total_size(2) +
2123 /* IFLA_GRE_ENCAP_SPORT */
2124 nla_total_size(2) +
2125 /* IFLA_GRE_ENCAP_DPORT */
2126 nla_total_size(2) +
6712abc1
WT		 2127 /* IFLA_GRE_COLLECT_METADATA */
2128 nla_total_size(0) +
0a473b82
CG		 2129 /* IFLA_GRE_FWMARK */
2130 nla_total_size(4) +
5a963eb6
WT		 2131 /* IFLA_GRE_ERSPAN_INDEX */
2132 nla_total_size(4) +
c12b395a 2133 0;
2134}
2135
2136static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2137{
2138 struct ip6_tnl *t = netdev_priv(dev);
2139 struct __ip6_tnl_parm *p = &t->parms;
c706863b
LB		 2140 __be16 o_flags = p->o_flags;
2141
103d0244
LB		 2142 if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2143 if (!p->collect_md)
2144 o_flags |= TUNNEL_KEY;
2145
2146 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2147 goto nla_put_failure;
2148
2149 if (p->erspan_ver == 1) {
2150 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2151 goto nla_put_failure;
2152 } else {
2153 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2154 goto nla_put_failure;
2155 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2156 goto nla_put_failure;
2157 }
2158 }
c12b395a 2159
2160 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
f41fe3c2
TH		 2161 nla_put_be16(skb, IFLA_GRE_IFLAGS,
2162 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2163 nla_put_be16(skb, IFLA_GRE_OFLAGS,
c706863b 2164 gre_tnl_flags_to_gre_flags(o_flags)) ||
c12b395a 2165 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2166 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
930345ea
JB		 2167 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2168 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
c12b395a 2169 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
c12b395a 2170 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2171 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
0a473b82 2172 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
103d0244 2173 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
c12b395a 2174 goto nla_put_failure;
1faf3d9f
TH		 2175
2176 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2177 t->encap.type) ||
2178 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2179 t->encap.sport) ||
2180 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2181 t->encap.dport) ||
2182 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2183 t->encap.flags))
2184 goto nla_put_failure;
2185
6712abc1
WT		 2186 if (p->collect_md) {
2187 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2188 goto nla_put_failure;
2189 }
2190
c12b395a 2191 return 0;
2192
2193nla_put_failure:
2194 return -EMSGSIZE;
2195}
2196
2197static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2198 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2199 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2200 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2201 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2202 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
c593642c
PB		 2203 [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct ipv6hdr, saddr) },
2204 [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct ipv6hdr, daddr) },
c12b395a 2205 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2206 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2207 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2208 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1faf3d9f
TH		 2209 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2210 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2211 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2212 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
6712abc1 2213 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
0a473b82 2214 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
5a963eb6 2215 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
94d7d8f2
WT		 2216 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2217 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2218 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
c12b395a 2219};
2220
5a963eb6
WT		 2221static void ip6erspan_tap_setup(struct net_device *dev)
2222{
2223 ether_setup(dev);
2224
4123f637 2225 dev->max_mtu = 0;
5a963eb6
WT		 2226 dev->netdev_ops = &ip6erspan_netdev_ops;
2227 dev->needs_free_netdev = true;
2228 dev->priv_destructor = ip6gre_dev_free;
2229
5a963eb6
WT		 2230 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2231 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2232 netif_keep_dst(dev);
2233}
2234
2d665034
PM		 2235static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2236 struct nlattr *tb[], struct nlattr *data[],
2237 struct netlink_ext_ack *extack)
2238{
2d665034
PM		 2239 struct ip6_tnl *nt = netdev_priv(dev);
2240 struct net *net = dev_net(dev);
b80d0b93
WT		 2241 struct ip6gre_net *ign;
2242 int err;
2243
2244 ip6gre_netlink_parms(data, &nt->parms);
4974d5f6 2245 ip6erspan_set_version(data, &nt->parms);
b80d0b93
WT		 2246 ign = net_generic(net, ip6gre_net_id);
2247
2248 if (nt->parms.collect_md) {
2249 if (rtnl_dereference(ign->collect_md_tun_erspan))
2250 return -EEXIST;
2251 } else {
2252 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2253 return -EEXIST;
2254 }
2d665034 2255
b80d0b93 2256 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2d665034
PM		 2257 if (!err) {
2258 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
b80d0b93 2259 ip6erspan_tunnel_link_md(ign, nt);
2d665034
PM		 2260 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2261 }
2262 return err;
2263}
2264
2265static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2266{
2267 ip6gre_tnl_link_config_common(t);
2268 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2269}
2270
2271static int ip6erspan_tnl_change(struct ip6_tnl *t,
2272 const struct __ip6_tnl_parm *p, int set_mtu)
2273{
2274 ip6gre_tnl_copy_tnl_parm(t, p);
2275 ip6erspan_tnl_link_config(t, set_mtu);
2276 return 0;
2277}
2278
2279static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2280 struct nlattr *data[],
2281 struct netlink_ext_ack *extack)
2282{
2283 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2284 struct __ip6_tnl_parm p;
2285 struct ip6_tnl *t;
2286
2287 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2288 if (IS_ERR(t))
2289 return PTR_ERR(t);
2290
4974d5f6 2291 ip6erspan_set_version(data, &p);
b80d0b93 2292 ip6gre_tunnel_unlink_md(ign, t);
2d665034
PM		 2293 ip6gre_tunnel_unlink(ign, t);
2294 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
b80d0b93 2295 ip6erspan_tunnel_link_md(ign, t);
2d665034
PM		 2296 ip6gre_tunnel_link(ign, t);
2297 return 0;
2298}
2299
c12b395a 2300static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2301 .kind = "ip6gre",
2302 .maxtype = IFLA_GRE_MAX,
2303 .policy = ip6gre_policy,
2304 .priv_size = sizeof(struct ip6_tnl),
2305 .setup = ip6gre_tunnel_setup,
2306 .validate = ip6gre_tunnel_validate,
2307 .newlink = ip6gre_newlink,
2308 .changelink = ip6gre_changelink,
54d63f78 2309 .dellink = ip6gre_dellink,
c12b395a 2310 .get_size = ip6gre_get_size,
2311 .fill_info = ip6gre_fill_info,
1728d4fa 2312 .get_link_net = ip6_tnl_get_link_net,
c12b395a 2313};
2314
2315static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2316 .kind = "ip6gretap",
2317 .maxtype = IFLA_GRE_MAX,
2318 .policy = ip6gre_policy,
2319 .priv_size = sizeof(struct ip6_tnl),
2320 .setup = ip6gre_tap_setup,
2321 .validate = ip6gre_tap_validate,
2322 .newlink = ip6gre_newlink,
2323 .changelink = ip6gre_changelink,
2324 .get_size = ip6gre_get_size,
2325 .fill_info = ip6gre_fill_info,
3390e397 2326 .get_link_net = ip6_tnl_get_link_net,
c12b395a 2327};
2328
5a963eb6
WT		 2329static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2330 .kind = "ip6erspan",
2331 .maxtype = IFLA_GRE_MAX,
2332 .policy = ip6gre_policy,
2333 .priv_size = sizeof(struct ip6_tnl),
2334 .setup = ip6erspan_tap_setup,
2335 .validate = ip6erspan_tap_validate,
2d665034
PM		 2336 .newlink = ip6erspan_newlink,
2337 .changelink = ip6erspan_changelink,
5a963eb6
WT		 2338 .get_size = ip6gre_get_size,
2339 .fill_info = ip6gre_fill_info,
2340 .get_link_net = ip6_tnl_get_link_net,
2341};
2342
c12b395a 2343/*
2344 * And now the modules code and kernel interface.
2345 */
2346
2347static int __init ip6gre_init(void)
2348{
2349 int err;
2350
2351 pr_info("GRE over IPv6 tunneling driver\n");
2352
2353 err = register_pernet_device(&ip6gre_net_ops);
2354 if (err < 0)
2355 return err;
2356
2357 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2358 if (err < 0) {
2359 pr_info("%s: can't add protocol\n", __func__);
2360 goto add_proto_failed;
2361 }
2362
2363 err = rtnl_link_register(&ip6gre_link_ops);
2364 if (err < 0)
2365 goto rtnl_link_failed;
2366
2367 err = rtnl_link_register(&ip6gre_tap_ops);
2368 if (err < 0)
2369 goto tap_ops_failed;
2370
5a963eb6
WT		 2371 err = rtnl_link_register(&ip6erspan_tap_ops);
2372 if (err < 0)
2373 goto erspan_link_failed;
2374
c12b395a 2375out:
2376 return err;
2377
5a963eb6
WT		 2378erspan_link_failed:
2379 rtnl_link_unregister(&ip6gre_tap_ops);
c12b395a 2380tap_ops_failed:
2381 rtnl_link_unregister(&ip6gre_link_ops);
2382rtnl_link_failed:
2383 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2384add_proto_failed:
2385 unregister_pernet_device(&ip6gre_net_ops);
2386 goto out;
2387}
2388
2389static void __exit ip6gre_fini(void)
2390{
2391 rtnl_link_unregister(&ip6gre_tap_ops);
2392 rtnl_link_unregister(&ip6gre_link_ops);
5a963eb6 2393 rtnl_link_unregister(&ip6erspan_tap_ops);
c12b395a 2394 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2395 unregister_pernet_device(&ip6gre_net_ops);
2396}
2397
2398module_init(ip6gre_init);
2399module_exit(ip6gre_fini);
2400MODULE_LICENSE("GPL");
2401MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2402MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2403MODULE_ALIAS_RTNL_LINK("ip6gre");
5a4ee9a9 2404MODULE_ALIAS_RTNL_LINK("ip6gretap");
94d7d8f2 2405MODULE_ALIAS_RTNL_LINK("ip6erspan");
c12b395a 2406MODULE_ALIAS_NETDEV("ip6gre0");
Linux 6.x block layer and io_uring tree(s)