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sctp: remove useless start_fail from sctp_ht_iter in proc
[linux-block.git] / net / ipv6 / ip6_gre.c
CommitLineData
c12b395a 1/*
2 * GRE over IPv6 protocol decoder.
3 *
4 * Authors: Dmitry Kozlov (xeb@mail.ru)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 */
12
13#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15#include <linux/capability.h>
16#include <linux/module.h>
17#include <linux/types.h>
18#include <linux/kernel.h>
19#include <linux/slab.h>
20#include <linux/uaccess.h>
21#include <linux/skbuff.h>
22#include <linux/netdevice.h>
23#include <linux/in.h>
24#include <linux/tcp.h>
25#include <linux/udp.h>
26#include <linux/if_arp.h>
c12b395a 27#include <linux/init.h>
28#include <linux/in6.h>
29#include <linux/inetdevice.h>
30#include <linux/igmp.h>
31#include <linux/netfilter_ipv4.h>
32#include <linux/etherdevice.h>
33#include <linux/if_ether.h>
34#include <linux/hash.h>
35#include <linux/if_tunnel.h>
36#include <linux/ip6_tunnel.h>
37
38#include <net/sock.h>
39#include <net/ip.h>
c5441932 40#include <net/ip_tunnels.h>
c12b395a 41#include <net/icmp.h>
42#include <net/protocol.h>
43#include <net/addrconf.h>
44#include <net/arp.h>
45#include <net/checksum.h>
46#include <net/dsfield.h>
47#include <net/inet_ecn.h>
48#include <net/xfrm.h>
49#include <net/net_namespace.h>
50#include <net/netns/generic.h>
51#include <net/rtnetlink.h>
52
53#include <net/ipv6.h>
54#include <net/ip6_fib.h>
55#include <net/ip6_route.h>
56#include <net/ip6_tunnel.h>
308edfdf 57#include <net/gre.h>
5a963eb6 58#include <net/erspan.h>
6712abc1 59#include <net/dst_metadata.h>
c12b395a 60
61
eccc1bb8 62static bool log_ecn_error = true;
63module_param(log_ecn_error, bool, 0644);
64MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
65
e87a8f24
JK		 66#define IP6_GRE_HASH_SIZE_SHIFT 5
67#define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
c12b395a 68
c7d03a00 69static unsigned int ip6gre_net_id __read_mostly;
c12b395a 70struct ip6gre_net {
e87a8f24 71 struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
c12b395a 72
6712abc1 73 struct ip6_tnl __rcu *collect_md_tun;
b80d0b93 74 struct ip6_tnl __rcu *collect_md_tun_erspan;
c12b395a 75 struct net_device *fb_tunnel_dev;
76};
77
78static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
22f08069 79static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
5a963eb6 80static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly;
c12b395a 81static int ip6gre_tunnel_init(struct net_device *dev);
82static void ip6gre_tunnel_setup(struct net_device *dev);
83static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
84static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
2d665034 85static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu);
c12b395a 86
87/* Tunnel hash table */
88
89/*
90 4 hash tables:
91
92 3: (remote,local)
93 2: (remote,*)
94 1: (*,local)
95 0: (*,*)
96
97 We require exact key match i.e. if a key is present in packet
98 it will match only tunnel with the same key; if it is not present,
99 it will match only keyless tunnel.
100
101 All keysless packets, if not matched configured keyless tunnels
102 will match fallback tunnel.
103 */
104
e87a8f24 105#define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
c12b395a 106static u32 HASH_ADDR(const struct in6_addr *addr)
107{
108 u32 hash = ipv6_addr_hash(addr);
109
e87a8f24 110 return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
c12b395a 111}
112
113#define tunnels_r_l tunnels[3]
114#define tunnels_r tunnels[2]
115#define tunnels_l tunnels[1]
116#define tunnels_wc tunnels[0]
c12b395a 117
c12b395a 118/* Given src, dst and key, find appropriate for input tunnel. */
119
120static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
121 const struct in6_addr *remote, const struct in6_addr *local,
122 __be32 key, __be16 gre_proto)
123{
124 struct net *net = dev_net(dev);
125 int link = dev->ifindex;
126 unsigned int h0 = HASH_ADDR(remote);
127 unsigned int h1 = HASH_KEY(key);
128 struct ip6_tnl *t, *cand = NULL;
129 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
5a963eb6 130 int dev_type = (gre_proto == htons(ETH_P_TEB) ||
3b04caab
WT		 131 gre_proto == htons(ETH_P_ERSPAN) ||
132 gre_proto == htons(ETH_P_ERSPAN2)) ?
c12b395a 133 ARPHRD_ETHER : ARPHRD_IP6GRE;
134 int score, cand_score = 4;
135
e086cadc 136 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
c12b395a 137 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
138 !ipv6_addr_equal(remote, &t->parms.raddr) ||
139 key != t->parms.i_key ||
140 !(t->dev->flags & IFF_UP))
141 continue;
142
143 if (t->dev->type != ARPHRD_IP6GRE &&
144 t->dev->type != dev_type)
145 continue;
146
147 score = 0;
148 if (t->parms.link != link)
149 score |= 1;
150 if (t->dev->type != dev_type)
151 score |= 2;
152 if (score == 0)
153 return t;
154
155 if (score < cand_score) {
156 cand = t;
157 cand_score = score;
158 }
159 }
160
e086cadc 161 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
c12b395a 162 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
163 key != t->parms.i_key ||
164 !(t->dev->flags & IFF_UP))
165 continue;
166
167 if (t->dev->type != ARPHRD_IP6GRE &&
168 t->dev->type != dev_type)
169 continue;
170
171 score = 0;
172 if (t->parms.link != link)
173 score |= 1;
174 if (t->dev->type != dev_type)
175 score |= 2;
176 if (score == 0)
177 return t;
178
179 if (score < cand_score) {
180 cand = t;
181 cand_score = score;
182 }
183 }
184
e086cadc 185 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
c12b395a 186 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
187 (!ipv6_addr_equal(local, &t->parms.raddr) ||
188 !ipv6_addr_is_multicast(local))) ||
189 key != t->parms.i_key ||
190 !(t->dev->flags & IFF_UP))
191 continue;
192
193 if (t->dev->type != ARPHRD_IP6GRE &&
194 t->dev->type != dev_type)
195 continue;
196
197 score = 0;
198 if (t->parms.link != link)
199 score |= 1;
200 if (t->dev->type != dev_type)
201 score |= 2;
202 if (score == 0)
203 return t;
204
205 if (score < cand_score) {
206 cand = t;
207 cand_score = score;
208 }
209 }
210
e086cadc 211 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
c12b395a 212 if (t->parms.i_key != key ||
213 !(t->dev->flags & IFF_UP))
214 continue;
215
216 if (t->dev->type != ARPHRD_IP6GRE &&
217 t->dev->type != dev_type)
218 continue;
219
220 score = 0;
221 if (t->parms.link != link)
222 score |= 1;
223 if (t->dev->type != dev_type)
224 score |= 2;
225 if (score == 0)
226 return t;
227
228 if (score < cand_score) {
229 cand = t;
230 cand_score = score;
231 }
232 }
233
53b24b8f 234 if (cand)
c12b395a 235 return cand;
236
b80d0b93
WT		 237 if (gre_proto == htons(ETH_P_ERSPAN) ||
238 gre_proto == htons(ETH_P_ERSPAN2))
239 t = rcu_dereference(ign->collect_md_tun_erspan);
240 else
241 t = rcu_dereference(ign->collect_md_tun);
242
6712abc1
WT		 243 if (t && t->dev->flags & IFF_UP)
244 return t;
245
c12b395a 246 dev = ign->fb_tunnel_dev;
79134e6c 247 if (dev && dev->flags & IFF_UP)
c12b395a 248 return netdev_priv(dev);
249
250 return NULL;
251}
252
253static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
254 const struct __ip6_tnl_parm *p)
255{
256 const struct in6_addr *remote = &p->raddr;
257 const struct in6_addr *local = &p->laddr;
258 unsigned int h = HASH_KEY(p->i_key);
259 int prio = 0;
260
261 if (!ipv6_addr_any(local))
262 prio |= 1;
263 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
264 prio |= 2;
265 h ^= HASH_ADDR(remote);
266 }
267
268 return &ign->tunnels[prio][h];
269}
270
b80d0b93
WT		 271static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
272{
273 if (t->parms.collect_md)
274 rcu_assign_pointer(ign->collect_md_tun, t);
275}
276
277static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
278{
279 if (t->parms.collect_md)
280 rcu_assign_pointer(ign->collect_md_tun_erspan, t);
281}
282
283static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t)
284{
285 if (t->parms.collect_md)
286 rcu_assign_pointer(ign->collect_md_tun, NULL);
287}
288
289static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign,
290 struct ip6_tnl *t)
291{
292 if (t->parms.collect_md)
293 rcu_assign_pointer(ign->collect_md_tun_erspan, NULL);
294}
295
c12b395a 296static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
297 const struct ip6_tnl *t)
298{
299 return __ip6gre_bucket(ign, &t->parms);
300}
301
302static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
303{
304 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
305
306 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
307 rcu_assign_pointer(*tp, t);
308}
309
310static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
311{
312 struct ip6_tnl __rcu **tp;
313 struct ip6_tnl *iter;
314
315 for (tp = ip6gre_bucket(ign, t);
316 (iter = rtnl_dereference(*tp)) != NULL;
317 tp = &iter->next) {
318 if (t == iter) {
319 rcu_assign_pointer(*tp, t->next);
320 break;
321 }
322 }
323}
324
325static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
326 const struct __ip6_tnl_parm *parms,
327 int type)
328{
329 const struct in6_addr *remote = &parms->raddr;
330 const struct in6_addr *local = &parms->laddr;
331 __be32 key = parms->i_key;
332 int link = parms->link;
333 struct ip6_tnl *t;
334 struct ip6_tnl __rcu **tp;
335 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
336
337 for (tp = __ip6gre_bucket(ign, parms);
338 (t = rtnl_dereference(*tp)) != NULL;
339 tp = &t->next)
340 if (ipv6_addr_equal(local, &t->parms.laddr) &&
341 ipv6_addr_equal(remote, &t->parms.raddr) &&
342 key == t->parms.i_key &&
343 link == t->parms.link &&
344 type == t->dev->type)
345 break;
346
347 return t;
348}
349
350static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
351 const struct __ip6_tnl_parm *parms, int create)
352{
353 struct ip6_tnl *t, *nt;
354 struct net_device *dev;
355 char name[IFNAMSIZ];
356 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
357
358 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
cd0a0bd9
SK		 359 if (t && create)
360 return NULL;
c12b395a 361 if (t || !create)
362 return t;
363
5f42df01
ED		 364 if (parms->name[0]) {
365 if (!dev_valid_name(parms->name))
366 return NULL;
c12b395a 367 strlcpy(name, parms->name, IFNAMSIZ);
5f42df01 368 } else {
c12b395a 369 strcpy(name, "ip6gre%d");
5f42df01 370 }
c835a677
TG		 371 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
372 ip6gre_tunnel_setup);
c12b395a 373 if (!dev)
374 return NULL;
375
376 dev_net_set(dev, net);
377
378 nt = netdev_priv(dev);
379 nt->parms = *parms;
380 dev->rtnl_link_ops = &ip6gre_link_ops;
381
382 nt->dev = dev;
0bd87628 383 nt->net = dev_net(dev);
c12b395a 384
385 if (register_netdevice(dev) < 0)
386 goto failed_free;
387
128bb975
AK		 388 ip6gre_tnl_link_config(nt, 1);
389
c12b395a 390 /* Can use a lockless transmit, unless we generate output sequences */
b45bd1d7 391 if (!(nt->parms.o_flags & TUNNEL_SEQ))
c12b395a 392 dev->features |= NETIF_F_LLTX;
393
394 dev_hold(dev);
395 ip6gre_tunnel_link(ign, nt);
396 return nt;
397
398failed_free:
399 free_netdev(dev);
400 return NULL;
401}
402
b80d0b93
WT		 403static void ip6erspan_tunnel_uninit(struct net_device *dev)
404{
405 struct ip6_tnl *t = netdev_priv(dev);
406 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
407
408 ip6erspan_tunnel_unlink_md(ign, t);
409 ip6gre_tunnel_unlink(ign, t);
410 dst_cache_reset(&t->dst_cache);
411 dev_put(dev);
412}
413
c12b395a 414static void ip6gre_tunnel_uninit(struct net_device *dev)
415{
22f08069
ND		 416 struct ip6_tnl *t = netdev_priv(dev);
417 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
c12b395a 418
b80d0b93 419 ip6gre_tunnel_unlink_md(ign, t);
22f08069 420 ip6gre_tunnel_unlink(ign, t);
607f725f 421 dst_cache_reset(&t->dst_cache);
c12b395a 422 dev_put(dev);
423}
424
425
426static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
7892032c 427 u8 type, u8 code, int offset, __be32 info)
c12b395a 428{
929fc032 429 struct net *net = dev_net(skb->dev);
7892032c
ED		 430 const struct gre_base_hdr *greh;
431 const struct ipv6hdr *ipv6h;
432 int grehlen = sizeof(*greh);
c12b395a 433 struct ip6_tnl *t;
7892032c 434 int key_off = 0;
c12b395a 435 __be16 flags;
7892032c 436 __be32 key;
c12b395a 437
7892032c
ED		 438 if (!pskb_may_pull(skb, offset + grehlen))
439 return;
440 greh = (const struct gre_base_hdr *)(skb->data + offset);
441 flags = greh->flags;
442 if (flags & (GRE_VERSION | GRE_ROUTING))
443 return;
444 if (flags & GRE_CSUM)
445 grehlen += 4;
446 if (flags & GRE_KEY) {
447 key_off = grehlen + offset;
448 grehlen += 4;
c12b395a 449 }
450
7892032c 451 if (!pskb_may_pull(skb, offset + grehlen))
c12b395a 452 return;
b87fb39e 453 ipv6h = (const struct ipv6hdr *)skb->data;
7892032c
ED		 454 greh = (const struct gre_base_hdr *)(skb->data + offset);
455 key = key_off ? *(__be32 *)(skb->data + key_off) : 0;
c12b395a 456
c12b395a 457 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
7892032c 458 key, greh->protocol);
63159f29 459 if (!t)
0c5794a6 460 return;
c12b395a 461
462 switch (type) {
c12b395a 463 struct ipv6_tlv_tnl_enc_lim *tel;
fe1a4ca0 464 __u32 teli;
c12b395a 465 case ICMPV6_DEST_UNREACH:
a46496ce
MB		 466 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
467 t->parms.name);
f8d20b46
XL		 468 if (code != ICMPV6_PORT_UNREACH)
469 break;
470 return;
c12b395a 471 case ICMPV6_TIME_EXCEED:
472 if (code == ICMPV6_EXC_HOPLIMIT) {
a46496ce
MB		 473 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
474 t->parms.name);
f8d20b46 475 break;
c12b395a 476 }
f8d20b46 477 return;
c12b395a 478 case ICMPV6_PARAMPROB:
479 teli = 0;
480 if (code == ICMPV6_HDR_FIELD)
481 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
482
d1e158e2 483 if (teli && teli == be32_to_cpu(info) - 2) {
c12b395a 484 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
485 if (tel->encap_limit == 0) {
a46496ce
MB		 486 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
487 t->parms.name);
c12b395a 488 }
489 } else {
a46496ce
MB		 490 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
491 t->parms.name);
c12b395a 492 }
f8d20b46 493 return;
c12b395a 494 case ICMPV6_PKT_TOOBIG:
fe1a4ca0 495 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
f8d20b46 496 return;
929fc032
XL		 497 case NDISC_REDIRECT:
498 ip6_redirect(skb, net, skb->dev->ifindex, 0,
499 sock_net_uid(net, NULL));
500 return;
c12b395a 501 }
502
503 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
504 t->err_count++;
505 else
506 t->err_count = 1;
507 t->err_time = jiffies;
c12b395a 508}
509
308edfdf 510static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
c12b395a 511{
512 const struct ipv6hdr *ipv6h;
c12b395a 513 struct ip6_tnl *tunnel;
c12b395a 514
515 ipv6h = ipv6_hdr(skb);
c12b395a 516 tunnel = ip6gre_tunnel_lookup(skb->dev,
308edfdf
TH		 517 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
518 tpi->proto);
c12b395a 519 if (tunnel) {
6712abc1
WT		 520 if (tunnel->parms.collect_md) {
521 struct metadata_dst *tun_dst;
522 __be64 tun_id;
523 __be16 flags;
524
525 flags = tpi->flags;
526 tun_id = key32_to_tunnel_id(tpi->key);
527
528 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
529 if (!tun_dst)
530 return PACKET_REJECT;
531
532 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
533 } else {
534 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
535 }
c12b395a 536
308edfdf
TH		 537 return PACKET_RCVD;
538 }
eccc1bb8 539
308edfdf
TH		 540 return PACKET_REJECT;
541}
eccc1bb8 542
5a963eb6
WT		 543static int ip6erspan_rcv(struct sk_buff *skb, int gre_hdr_len,
544 struct tnl_ptk_info *tpi)
545{
1d7e2ed2
WT		 546 struct erspan_base_hdr *ershdr;
547 struct erspan_metadata *pkt_md;
5a963eb6 548 const struct ipv6hdr *ipv6h;
3df19283 549 struct erspan_md2 *md2;
5a963eb6 550 struct ip6_tnl *tunnel;
1d7e2ed2 551 u8 ver;
5a963eb6 552
5a963eb6
WT		 553 if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr))))
554 return PACKET_REJECT;
555
293a1991
HY		 556 ipv6h = ipv6_hdr(skb);
557 ershdr = (struct erspan_base_hdr *)skb->data;
c69de58b
WT		 558 ver = ershdr->ver;
559 tpi->key = cpu_to_be32(get_session_id(ershdr));
5a963eb6
WT		 560
561 tunnel = ip6gre_tunnel_lookup(skb->dev,
562 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
563 tpi->proto);
564 if (tunnel) {
1d7e2ed2
WT		 565 int len = erspan_hdr_len(ver);
566
567 if (unlikely(!pskb_may_pull(skb, len)))
ae3e1337 568 return PACKET_REJECT;
1d7e2ed2 569
d91e8db5
WT		 570 ershdr = (struct erspan_base_hdr *)skb->data;
571 pkt_md = (struct erspan_metadata *)(ershdr + 1);
572
1d7e2ed2 573 if (__iptunnel_pull_header(skb, len,
5a963eb6
WT		 574 htons(ETH_P_TEB),
575 false, false) < 0)
576 return PACKET_REJECT;
577
ef7baf5e
WT		 578 if (tunnel->parms.collect_md) {
579 struct metadata_dst *tun_dst;
580 struct ip_tunnel_info *info;
581 struct erspan_metadata *md;
582 __be64 tun_id;
583 __be16 flags;
584
585 tpi->flags |= TUNNEL_KEY;
586 flags = tpi->flags;
587 tun_id = key32_to_tunnel_id(tpi->key);
588
589 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
590 sizeof(*md));
591 if (!tun_dst)
592 return PACKET_REJECT;
593
594 info = &tun_dst->u.tun_info;
595 md = ip_tunnel_info_opts(info);
94d7d8f2 596 md->version = ver;
3df19283
WT		 597 md2 = &md->u.md2;
598 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
599 ERSPAN_V2_MDSIZE);
ef7baf5e
WT		 600 info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
601 info->options_len = sizeof(*md);
602
603 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
604
605 } else {
ef7baf5e
WT		 606 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
607 }
5a963eb6
WT		 608
609 return PACKET_RCVD;
610 }
611
612 return PACKET_REJECT;
613}
614
308edfdf
TH		 615static int gre_rcv(struct sk_buff *skb)
616{
617 struct tnl_ptk_info tpi;
618 bool csum_err = false;
619 int hdr_len;
eccc1bb8 620
e582615a 621 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
f132ae7c 622 if (hdr_len < 0)
308edfdf 623 goto drop;
c12b395a 624
308edfdf
TH		 625 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
626 goto drop;
c12b395a 627
94d7d8f2
WT		 628 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
629 tpi.proto == htons(ETH_P_ERSPAN2))) {
5a963eb6
WT		 630 if (ip6erspan_rcv(skb, hdr_len, &tpi) == PACKET_RCVD)
631 return 0;
a7343211 632 goto out;
5a963eb6
WT		 633 }
634
308edfdf 635 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
c12b395a 636 return 0;
c12b395a 637
a7343211 638out:
308edfdf 639 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
c12b395a 640drop:
c12b395a 641 kfree_skb(skb);
642 return 0;
643}
644
b05229f4 645static int gre_handle_offloads(struct sk_buff *skb, bool csum)
c12b395a 646{
b05229f4
TH		 647 return iptunnel_handle_offloads(skb,
648 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
c12b395a 649}
650
898b2979
WT		 651static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
652 struct net_device *dev,
653 struct flowi6 *fl6, __u8 *dsfield,
654 int *encap_limit)
655{
656 const struct iphdr *iph = ip_hdr(skb);
657 struct ip6_tnl *t = netdev_priv(dev);
658
659 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
660 *encap_limit = t->parms.encap_limit;
661
662 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
663
664 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
665 *dsfield = ipv4_get_dsfield(iph);
666 else
667 *dsfield = ip6_tclass(t->parms.flowinfo);
668
669 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
670 fl6->flowi6_mark = skb->mark;
671 else
672 fl6->flowi6_mark = t->parms.fwmark;
673
674 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
675}
676
677static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
678 struct net_device *dev,
679 struct flowi6 *fl6, __u8 *dsfield,
680 int *encap_limit)
681{
682 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
683 struct ip6_tnl *t = netdev_priv(dev);
684 __u16 offset;
685
686 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
687 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
688
689 if (offset > 0) {
690 struct ipv6_tlv_tnl_enc_lim *tel;
691
692 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
693 if (tel->encap_limit == 0) {
694 icmpv6_send(skb, ICMPV6_PARAMPROB,
695 ICMPV6_HDR_FIELD, offset + 2);
696 return -1;
697 }
698 *encap_limit = tel->encap_limit - 1;
699 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
700 *encap_limit = t->parms.encap_limit;
701 }
702
703 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
704
705 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
706 *dsfield = ipv6_get_dsfield(ipv6h);
707 else
708 *dsfield = ip6_tclass(t->parms.flowinfo);
709
710 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
711 fl6->flowlabel |= ip6_flowlabel(ipv6h);
712
713 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
714 fl6->flowi6_mark = skb->mark;
715 else
716 fl6->flowi6_mark = t->parms.fwmark;
717
718 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
719
720 return 0;
721}
722
b05229f4
TH		 723static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
724 struct net_device *dev, __u8 dsfield,
725 struct flowi6 *fl6, int encap_limit,
726 __u32 *pmtu, __be16 proto)
c12b395a 727{
c12b395a 728 struct ip6_tnl *tunnel = netdev_priv(dev);
8aec4959 729 __be16 protocol;
c12b395a 730
731 if (dev->type == ARPHRD_ETHER)
732 IPCB(skb)->flags = 0;
733
b05229f4
TH		 734 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
735 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
736 else
c12b395a 737 fl6->daddr = tunnel->parms.raddr;
c12b395a 738
01b8d064
PM		 739 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
740 return -ENOMEM;
741
b05229f4 742 /* Push GRE header. */
8aec4959 743 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
6712abc1
WT		 744
745 if (tunnel->parms.collect_md) {
746 struct ip_tunnel_info *tun_info;
747 const struct ip_tunnel_key *key;
748 __be16 flags;
749
750 tun_info = skb_tunnel_info(skb);
751 if (unlikely(!tun_info ||
752 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
753 ip_tunnel_info_af(tun_info) != AF_INET6))
754 return -EINVAL;
755
756 key = &tun_info->key;
757 memset(fl6, 0, sizeof(*fl6));
758 fl6->flowi6_proto = IPPROTO_GRE;
759 fl6->daddr = key->u.ipv6.dst;
760 fl6->flowlabel = key->label;
761 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
762
763 dsfield = key->tos;
77a5196a
WT		 764 flags = key->tun_flags &
765 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
6712abc1
WT		 766 tunnel->tun_hlen = gre_calc_hlen(flags);
767
768 gre_build_header(skb, tunnel->tun_hlen,
769 flags, protocol,
77a5196a 770 tunnel_id_to_key32(tun_info->key.tun_id),
15746394 771 (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++)
77a5196a 772 : 0);
6712abc1
WT		 773
774 } else {
77a5196a
WT		 775 if (tunnel->parms.o_flags & TUNNEL_SEQ)
776 tunnel->o_seqno++;
777
6712abc1
WT		 778 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
779 protocol, tunnel->parms.o_key,
780 htonl(tunnel->o_seqno));
781 }
c12b395a 782
b05229f4
TH		 783 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
784 NEXTHDR_GRE);
c12b395a 785}
786
787static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
788{
789 struct ip6_tnl *t = netdev_priv(dev);
c12b395a 790 int encap_limit = -1;
791 struct flowi6 fl6;
6712abc1 792 __u8 dsfield = 0;
c12b395a 793 __u32 mtu;
794 int err;
795
5146d1f1
BH		 796 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
797
6712abc1
WT		 798 if (!t->parms.collect_md)
799 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
800 &dsfield, &encap_limit);
e2d118a1 801
b05229f4
TH		 802 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
803 if (err)
804 return -1;
805
806 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
807 skb->protocol);
c12b395a 808 if (err != 0) {
809 /* XXX: send ICMP error even if DF is not set. */
810 if (err == -EMSGSIZE)
811 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
812 htonl(mtu));
813 return -1;
814 }
815
816 return 0;
817}
818
819static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
820{
821 struct ip6_tnl *t = netdev_priv(dev);
822 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
823 int encap_limit = -1;
c12b395a 824 struct flowi6 fl6;
6712abc1 825 __u8 dsfield = 0;
c12b395a 826 __u32 mtu;
827 int err;
828
829 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
830 return -1;
831
6712abc1
WT		 832 if (!t->parms.collect_md &&
833 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
898b2979 834 return -1;
e2d118a1 835
b05229f4
TH		 836 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
837 return -1;
838
839 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
840 &mtu, skb->protocol);
c12b395a 841 if (err != 0) {
842 if (err == -EMSGSIZE)
843 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
844 return -1;
845 }
846
847 return 0;
848}
849
850/**
7ccbdff1 851 * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own
c12b395a 852 * @t: the outgoing tunnel device
853 * @hdr: IPv6 header from the incoming packet
854 *
855 * Description:
856 * Avoid trivial tunneling loop by checking that tunnel exit-point
857 * doesn't match source of incoming packet.
858 *
859 * Return:
860 * 1 if conflict,
861 * 0 else
862 **/
863
864static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
865 const struct ipv6hdr *hdr)
866{
867 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
868}
869
870static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
871{
872 struct ip6_tnl *t = netdev_priv(dev);
873 int encap_limit = -1;
874 struct flowi6 fl6;
875 __u32 mtu;
876 int err;
877
878 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
879 encap_limit = t->parms.encap_limit;
880
6712abc1
WT		 881 if (!t->parms.collect_md)
882 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
c12b395a 883
b05229f4
TH		 884 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
885 if (err)
886 return err;
887
888 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
c12b395a 889
890 return err;
891}
892
893static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
894 struct net_device *dev)
895{
896 struct ip6_tnl *t = netdev_priv(dev);
897 struct net_device_stats *stats = &t->dev->stats;
898 int ret;
899
d5005140 900 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
41ab3e31 901 goto tx_err;
c12b395a 902
903 switch (skb->protocol) {
904 case htons(ETH_P_IP):
905 ret = ip6gre_xmit_ipv4(skb, dev);
906 break;
907 case htons(ETH_P_IPV6):
908 ret = ip6gre_xmit_ipv6(skb, dev);
909 break;
910 default:
911 ret = ip6gre_xmit_other(skb, dev);
912 break;
913 }
914
915 if (ret < 0)
916 goto tx_err;
917
918 return NETDEV_TX_OK;
919
920tx_err:
921 stats->tx_errors++;
922 stats->tx_dropped++;
923 kfree_skb(skb);
924 return NETDEV_TX_OK;
925}
926
5a963eb6
WT		 927static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
928 struct net_device *dev)
929{
5a963eb6
WT		 930 struct ip6_tnl *t = netdev_priv(dev);
931 struct dst_entry *dst = skb_dst(skb);
932 struct net_device_stats *stats;
933 bool truncate = false;
934 int encap_limit = -1;
935 __u8 dsfield = false;
936 struct flowi6 fl6;
937 int err = -EINVAL;
938 __u32 mtu;
1baf5ebf 939 int nhoff;
d5db21a3 940 int thoff;
5a963eb6
WT		 941
942 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
943 goto tx_err;
944
945 if (gre_handle_offloads(skb, false))
946 goto tx_err;
947
5a963eb6
WT		 948 if (skb->len > dev->mtu + dev->hard_header_len) {
949 pskb_trim(skb, dev->mtu + dev->hard_header_len);
950 truncate = true;
951 }
952
1baf5ebf
WT		 953 nhoff = skb_network_header(skb) - skb_mac_header(skb);
954 if (skb->protocol == htons(ETH_P_IP) &&
955 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
956 truncate = true;
957
d5db21a3
WT		 958 thoff = skb_transport_header(skb) - skb_mac_header(skb);
959 if (skb->protocol == htons(ETH_P_IPV6) &&
960 (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff))
961 truncate = true;
962
5691484d 963 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
e41c7c68
WT		 964 goto tx_err;
965
5a963eb6 966 t->parms.o_flags &= ~TUNNEL_KEY;
5a963eb6 967 IPCB(skb)->flags = 0;
ef7baf5e
WT		 968
969 /* For collect_md mode, derive fl6 from the tunnel key,
970 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
971 */
972 if (t->parms.collect_md) {
973 struct ip_tunnel_info *tun_info;
974 const struct ip_tunnel_key *key;
975 struct erspan_metadata *md;
c69de58b 976 __be32 tun_id;
ef7baf5e
WT		 977
978 tun_info = skb_tunnel_info(skb);
979 if (unlikely(!tun_info ||
980 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
981 ip_tunnel_info_af(tun_info) != AF_INET6))
982 return -EINVAL;
983
984 key = &tun_info->key;
985 memset(&fl6, 0, sizeof(fl6));
986 fl6.flowi6_proto = IPPROTO_GRE;
987 fl6.daddr = key->u.ipv6.dst;
988 fl6.flowlabel = key->label;
989 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
990
991 dsfield = key->tos;
256c87c1
PJV		 992 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
993 goto tx_err;
ef7baf5e
WT		 994 md = ip_tunnel_info_opts(tun_info);
995 if (!md)
996 goto tx_err;
997
c69de58b 998 tun_id = tunnel_id_to_key32(key->tun_id);
94d7d8f2
WT		 999 if (md->version == 1) {
1000 erspan_build_header(skb,
c69de58b 1001 ntohl(tun_id),
94d7d8f2
WT		 1002 ntohl(md->u.index), truncate,
1003 false);
1004 } else if (md->version == 2) {
94d7d8f2 1005 erspan_build_header_v2(skb,
c69de58b
WT		 1006 ntohl(tun_id),
1007 md->u.md2.dir,
1008 get_hwid(&md->u.md2),
1009 truncate, false);
d6aa7119
WT		 1010 } else {
1011 goto tx_err;
94d7d8f2 1012 }
ef7baf5e 1013 } else {
b7ed8794
PB		 1014 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
1015
ef7baf5e
WT		 1016 switch (skb->protocol) {
1017 case htons(ETH_P_IP):
1018 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1019 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1020 &dsfield, &encap_limit);
1021 break;
1022 case htons(ETH_P_IPV6):
1023 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
1024 goto tx_err;
1025 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1026 &dsfield, &encap_limit))
1027 goto tx_err;
1028 break;
1029 default:
1030 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1031 break;
1032 }
1033
94d7d8f2 1034 if (t->parms.erspan_ver == 1)
c69de58b 1035 erspan_build_header(skb, ntohl(t->parms.o_key),
94d7d8f2
WT		 1036 t->parms.index,
1037 truncate, false);
02f99df1 1038 else if (t->parms.erspan_ver == 2)
c69de58b 1039 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
94d7d8f2
WT		 1040 t->parms.dir,
1041 t->parms.hwid,
1042 truncate, false);
02f99df1
WT		 1043 else
1044 goto tx_err;
1045
ef7baf5e
WT		 1046 fl6.daddr = t->parms.raddr;
1047 }
5a963eb6
WT		 1048
1049 /* Push GRE header. */
1050 gre_build_header(skb, 8, TUNNEL_SEQ,
1051 htons(ETH_P_ERSPAN), 0, htonl(t->o_seqno++));
1052
1053 /* TooBig packet may have updated dst->dev's mtu */
ef7baf5e 1054 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
5a963eb6
WT		 1055 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu);
1056
1057 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1058 NEXTHDR_GRE);
1059 if (err != 0) {
1060 /* XXX: send ICMP error even if DF is not set. */
1061 if (err == -EMSGSIZE) {
1062 if (skb->protocol == htons(ETH_P_IP))
1063 icmp_send(skb, ICMP_DEST_UNREACH,
1064 ICMP_FRAG_NEEDED, htonl(mtu));
1065 else
1066 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1067 }
1068
1069 goto tx_err;
1070 }
1071 return NETDEV_TX_OK;
1072
1073tx_err:
1074 stats = &t->dev->stats;
1075 stats->tx_errors++;
1076 stats->tx_dropped++;
1077 kfree_skb(skb);
1078 return NETDEV_TX_OK;
1079}
1080
a483373e 1081static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
c12b395a 1082{
1083 struct net_device *dev = t->dev;
1084 struct __ip6_tnl_parm *p = &t->parms;
1085 struct flowi6 *fl6 = &t->fl.u.ip6;
c12b395a 1086
1087 if (dev->type != ARPHRD_ETHER) {
1088 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1089 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1090 }
1091
1092 /* Set up flowi template */
1093 fl6->saddr = p->laddr;
1094 fl6->daddr = p->raddr;
1095 fl6->flowi6_oif = p->link;
1096 fl6->flowlabel = 0;
252f3f5a 1097 fl6->flowi6_proto = IPPROTO_GRE;
c12b395a 1098
1099 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1100 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1101 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1102 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1103
1104 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1105 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1106
1107 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1108 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1109 dev->flags |= IFF_POINTOPOINT;
1110 else
1111 dev->flags &= ~IFF_POINTOPOINT;
a483373e 1112}
c12b395a 1113
a483373e
PM		 1114static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1115 int t_hlen)
1116{
1117 const struct __ip6_tnl_parm *p = &t->parms;
1118 struct net_device *dev = t->dev;
c12b395a 1119
1120 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1121 int strict = (ipv6_addr_type(&p->raddr) &
1122 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1123
22f08069 1124 struct rt6_info *rt = rt6_lookup(t->net,
c12b395a 1125 &p->raddr, &p->laddr,
b75cc8f9 1126 p->link, NULL, strict);
c12b395a 1127
63159f29 1128 if (!rt)
c12b395a 1129 return;
1130
1131 if (rt->dst.dev) {
eb95f52f 1132 dev->needed_headroom = rt->dst.dev->hard_header_len +
db2ec95d 1133 t_hlen;
c12b395a 1134
1135 if (set_mtu) {
db2ec95d 1136 dev->mtu = rt->dst.dev->mtu - t_hlen;
c12b395a 1137 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1138 dev->mtu -= 8;
a9e242ca
AD		 1139 if (dev->type == ARPHRD_ETHER)
1140 dev->mtu -= ETH_HLEN;
c12b395a 1141
1142 if (dev->mtu < IPV6_MIN_MTU)
1143 dev->mtu = IPV6_MIN_MTU;
1144 }
1145 }
94e187c0 1146 ip6_rt_put(rt);
c12b395a 1147 }
c12b395a 1148}
1149
a483373e
PM		 1150static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1151{
1152 int t_hlen;
1153
1154 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1155 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1156
1157 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
eb95f52f 1158 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
a483373e
PM		 1159 return t_hlen;
1160}
1161
1162static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1163{
1164 ip6gre_tnl_link_config_common(t);
1165 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1166}
1167
a6465350
PM		 1168static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1169 const struct __ip6_tnl_parm *p)
c12b395a 1170{
1171 t->parms.laddr = p->laddr;
1172 t->parms.raddr = p->raddr;
1173 t->parms.flags = p->flags;
1174 t->parms.hop_limit = p->hop_limit;
1175 t->parms.encap_limit = p->encap_limit;
1176 t->parms.flowinfo = p->flowinfo;
1177 t->parms.link = p->link;
1178 t->parms.proto = p->proto;
1179 t->parms.i_key = p->i_key;
1180 t->parms.o_key = p->o_key;
1181 t->parms.i_flags = p->i_flags;
1182 t->parms.o_flags = p->o_flags;
0a473b82 1183 t->parms.fwmark = p->fwmark;
607f725f 1184 dst_cache_reset(&t->dst_cache);
a6465350
PM		 1185}
1186
1187static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1188 int set_mtu)
1189{
1190 ip6gre_tnl_copy_tnl_parm(t, p);
c12b395a 1191 ip6gre_tnl_link_config(t, set_mtu);
1192 return 0;
1193}
1194
1195static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1196 const struct ip6_tnl_parm2 *u)
1197{
1198 p->laddr = u->laddr;
1199 p->raddr = u->raddr;
1200 p->flags = u->flags;
1201 p->hop_limit = u->hop_limit;
1202 p->encap_limit = u->encap_limit;
1203 p->flowinfo = u->flowinfo;
1204 p->link = u->link;
1205 p->i_key = u->i_key;
1206 p->o_key = u->o_key;
f41fe3c2
TH		 1207 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1208 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
c12b395a 1209 memcpy(p->name, u->name, sizeof(u->name));
1210}
1211
1212static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1213 const struct __ip6_tnl_parm *p)
1214{
1215 u->proto = IPPROTO_GRE;
1216 u->laddr = p->laddr;
1217 u->raddr = p->raddr;
1218 u->flags = p->flags;
1219 u->hop_limit = p->hop_limit;
1220 u->encap_limit = p->encap_limit;
1221 u->flowinfo = p->flowinfo;
1222 u->link = p->link;
1223 u->i_key = p->i_key;
1224 u->o_key = p->o_key;
f41fe3c2
TH		 1225 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1226 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
c12b395a 1227 memcpy(u->name, p->name, sizeof(u->name));
1228}
1229
1230static int ip6gre_tunnel_ioctl(struct net_device *dev,
1231 struct ifreq *ifr, int cmd)
1232{
1233 int err = 0;
1234 struct ip6_tnl_parm2 p;
1235 struct __ip6_tnl_parm p1;
22f08069
ND		 1236 struct ip6_tnl *t = netdev_priv(dev);
1237 struct net *net = t->net;
c12b395a 1238 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1239
308edfdf
TH		 1240 memset(&p1, 0, sizeof(p1));
1241
c12b395a 1242 switch (cmd) {
1243 case SIOCGETTUNNEL:
c12b395a 1244 if (dev == ign->fb_tunnel_dev) {
1245 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1246 err = -EFAULT;
1247 break;
1248 }
1249 ip6gre_tnl_parm_from_user(&p1, &p);
1250 t = ip6gre_tunnel_locate(net, &p1, 0);
63159f29 1251 if (!t)
22f08069 1252 t = netdev_priv(dev);
c12b395a 1253 }
5dbd5068 1254 memset(&p, 0, sizeof(p));
c12b395a 1255 ip6gre_tnl_parm_to_user(&p, &t->parms);
1256 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1257 err = -EFAULT;
1258 break;
1259
1260 case SIOCADDTUNNEL:
1261 case SIOCCHGTUNNEL:
1262 err = -EPERM;
af31f412 1263 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
c12b395a 1264 goto done;
1265
1266 err = -EFAULT;
1267 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1268 goto done;
1269
1270 err = -EINVAL;
1271 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1272 goto done;
1273
1274 if (!(p.i_flags&GRE_KEY))
1275 p.i_key = 0;
1276 if (!(p.o_flags&GRE_KEY))
1277 p.o_key = 0;
1278
1279 ip6gre_tnl_parm_from_user(&p1, &p);
1280 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1281
1282 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
53b24b8f 1283 if (t) {
c12b395a 1284 if (t->dev != dev) {
1285 err = -EEXIST;
1286 break;
1287 }
1288 } else {
1289 t = netdev_priv(dev);
1290
1291 ip6gre_tunnel_unlink(ign, t);
1292 synchronize_net();
1293 ip6gre_tnl_change(t, &p1, 1);
1294 ip6gre_tunnel_link(ign, t);
1295 netdev_state_change(dev);
1296 }
1297 }
1298
1299 if (t) {
1300 err = 0;
1301
5dbd5068 1302 memset(&p, 0, sizeof(p));
c12b395a 1303 ip6gre_tnl_parm_to_user(&p, &t->parms);
1304 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1305 err = -EFAULT;
1306 } else
1307 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1308 break;
1309
1310 case SIOCDELTUNNEL:
1311 err = -EPERM;
af31f412 1312 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
c12b395a 1313 goto done;
1314
1315 if (dev == ign->fb_tunnel_dev) {
1316 err = -EFAULT;
1317 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1318 goto done;
1319 err = -ENOENT;
1320 ip6gre_tnl_parm_from_user(&p1, &p);
1321 t = ip6gre_tunnel_locate(net, &p1, 0);
63159f29 1322 if (!t)
c12b395a 1323 goto done;
1324 err = -EPERM;
1325 if (t == netdev_priv(ign->fb_tunnel_dev))
1326 goto done;
1327 dev = t->dev;
1328 }
1329 unregister_netdevice(dev);
1330 err = 0;
1331 break;
1332
1333 default:
1334 err = -EINVAL;
1335 }
1336
1337done:
1338 return err;
1339}
1340
c12b395a 1341static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
76cc0d32
XL		 1342 unsigned short type, const void *daddr,
1343 const void *saddr, unsigned int len)
c12b395a 1344{
1345 struct ip6_tnl *t = netdev_priv(dev);
76cc0d32
XL		 1346 struct ipv6hdr *ipv6h;
1347 __be16 *p;
c12b395a 1348
76cc0d32
XL		 1349 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1350 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1351 t->fl.u.ip6.flowlabel,
1352 true, &t->fl.u.ip6));
c12b395a 1353 ipv6h->hop_limit = t->parms.hop_limit;
1354 ipv6h->nexthdr = NEXTHDR_GRE;
1355 ipv6h->saddr = t->parms.laddr;
1356 ipv6h->daddr = t->parms.raddr;
1357
76cc0d32
XL		 1358 p = (__be16 *)(ipv6h + 1);
1359 p[0] = t->parms.o_flags;
1360 p[1] = htons(type);
c12b395a 1361
1362 /*
1363 * Set the source hardware address.
1364 */
1365
1366 if (saddr)
1367 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1368 if (daddr)
1369 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1370 if (!ipv6_addr_any(&ipv6h->daddr))
1371 return t->hlen;
1372
1373 return -t->hlen;
1374}
1375
c12b395a 1376static const struct header_ops ip6gre_header_ops = {
1377 .create = ip6gre_header,
c12b395a 1378};
1379
1380static const struct net_device_ops ip6gre_netdev_ops = {
1381 .ndo_init = ip6gre_tunnel_init,
1382 .ndo_uninit = ip6gre_tunnel_uninit,
1383 .ndo_start_xmit = ip6gre_tunnel_xmit,
1384 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
b05229f4 1385 .ndo_change_mtu = ip6_tnl_change_mtu,
f61dd388 1386 .ndo_get_stats64 = ip_tunnel_get_stats64,
ecf2c06a 1387 .ndo_get_iflink = ip6_tnl_get_iflink,
c12b395a 1388};
1389
1390static void ip6gre_dev_free(struct net_device *dev)
1391{
cdf3464e
MKL		 1392 struct ip6_tnl *t = netdev_priv(dev);
1393
0c1dd2a1 1394 gro_cells_destroy(&t->gro_cells);
607f725f 1395 dst_cache_destroy(&t->dst_cache);
c12b395a 1396 free_percpu(dev->tstats);
c12b395a 1397}
1398
1399static void ip6gre_tunnel_setup(struct net_device *dev)
1400{
c12b395a 1401 dev->netdev_ops = &ip6gre_netdev_ops;
cf124db5
DM		 1402 dev->needs_free_netdev = true;
1403 dev->priv_destructor = ip6gre_dev_free;
c12b395a 1404
1405 dev->type = ARPHRD_IP6GRE;
b05229f4 1406
c12b395a 1407 dev->flags |= IFF_NOARP;
c12b395a 1408 dev->addr_len = sizeof(struct in6_addr);
02875878 1409 netif_keep_dst(dev);
45ce0fd1
FJ		 1410 /* This perm addr will be used as interface identifier by IPv6 */
1411 dev->addr_assign_type = NET_ADDR_RANDOM;
1412 eth_random_addr(dev->perm_addr);
c12b395a 1413}
1414
e5a9336a
AK		 1415#define GRE6_FEATURES (NETIF_F_SG | \
1416 NETIF_F_FRAGLIST | \
1417 NETIF_F_HIGHDMA | \
1418 NETIF_F_HW_CSUM)
1419
1420static void ip6gre_tnl_init_features(struct net_device *dev)
1421{
1422 struct ip6_tnl *nt = netdev_priv(dev);
1423
1424 dev->features |= GRE6_FEATURES;
1425 dev->hw_features |= GRE6_FEATURES;
1426
1427 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1428 /* TCP offload with GRE SEQ is not supported, nor
1429 * can we support 2 levels of outer headers requiring
1430 * an update.
1431 */
1432 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1433 nt->encap.type == TUNNEL_ENCAP_NONE) {
1434 dev->features |= NETIF_F_GSO_SOFTWARE;
1435 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1436 }
1437
1438 /* Can use a lockless transmit, unless we generate
1439 * output sequences
1440 */
1441 dev->features |= NETIF_F_LLTX;
1442 }
1443}
1444
a3c119d3 1445static int ip6gre_tunnel_init_common(struct net_device *dev)
c12b395a 1446{
1447 struct ip6_tnl *tunnel;
cdf3464e 1448 int ret;
b05229f4 1449 int t_hlen;
c12b395a 1450
1451 tunnel = netdev_priv(dev);
1452
1453 tunnel->dev = dev;
0bd87628 1454 tunnel->net = dev_net(dev);
c12b395a 1455 strcpy(tunnel->parms.name, dev->name);
1456
a3c119d3
MKL		 1457 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1458 if (!dev->tstats)
1459 return -ENOMEM;
1460
607f725f 1461 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
0c1dd2a1
EBE		 1462 if (ret)
1463 goto cleanup_alloc_pcpu_stats;
1464
1465 ret = gro_cells_init(&tunnel->gro_cells, dev);
1466 if (ret)
1467 goto cleanup_dst_cache_init;
cdf3464e 1468
a483373e 1469 t_hlen = ip6gre_calc_hlen(tunnel);
db2ec95d 1470 dev->mtu = ETH_DATA_LEN - t_hlen;
1b227e53
HY		 1471 if (dev->type == ARPHRD_ETHER)
1472 dev->mtu -= ETH_HLEN;
b05229f4
TH		 1473 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1474 dev->mtu -= 8;
1475
6712abc1
WT		 1476 if (tunnel->parms.collect_md) {
1477 dev->features |= NETIF_F_NETNS_LOCAL;
1478 netif_keep_dst(dev);
1479 }
e5a9336a 1480 ip6gre_tnl_init_features(dev);
6712abc1 1481
a3c119d3 1482 return 0;
0c1dd2a1
EBE		 1483
1484cleanup_dst_cache_init:
1485 dst_cache_destroy(&tunnel->dst_cache);
1486cleanup_alloc_pcpu_stats:
1487 free_percpu(dev->tstats);
1488 dev->tstats = NULL;
1489 return ret;
a3c119d3
MKL		 1490}
1491
1492static int ip6gre_tunnel_init(struct net_device *dev)
1493{
1494 struct ip6_tnl *tunnel;
1495 int ret;
1496
1497 ret = ip6gre_tunnel_init_common(dev);
1498 if (ret)
1499 return ret;
1500
1501 tunnel = netdev_priv(dev);
1502
6712abc1
WT		 1503 if (tunnel->parms.collect_md)
1504 return 0;
1505
c12b395a 1506 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1507 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1508
1509 if (ipv6_addr_any(&tunnel->parms.raddr))
1510 dev->header_ops = &ip6gre_header_ops;
1511
c12b395a 1512 return 0;
1513}
1514
1515static void ip6gre_fb_tunnel_init(struct net_device *dev)
1516{
1517 struct ip6_tnl *tunnel = netdev_priv(dev);
1518
1519 tunnel->dev = dev;
0bd87628 1520 tunnel->net = dev_net(dev);
c12b395a 1521 strcpy(tunnel->parms.name, dev->name);
1522
1523 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1524
1525 dev_hold(dev);
1526}
1527
c12b395a 1528static struct inet6_protocol ip6gre_protocol __read_mostly = {
308edfdf 1529 .handler = gre_rcv,
c12b395a 1530 .err_handler = ip6gre_err,
1531 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1532};
1533
22f08069 1534static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
c12b395a 1535{
22f08069
ND		 1536 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1537 struct net_device *dev, *aux;
c12b395a 1538 int prio;
1539
22f08069
ND		 1540 for_each_netdev_safe(net, dev, aux)
1541 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
5a963eb6
WT		 1542 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1543 dev->rtnl_link_ops == &ip6erspan_tap_ops)
22f08069
ND		 1544 unregister_netdevice_queue(dev, head);
1545
c12b395a 1546 for (prio = 0; prio < 4; prio++) {
1547 int h;
e87a8f24 1548 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
c12b395a 1549 struct ip6_tnl *t;
1550
1551 t = rtnl_dereference(ign->tunnels[prio][h]);
1552
53b24b8f 1553 while (t) {
22f08069
ND		 1554 /* If dev is in the same netns, it has already
1555 * been added to the list by the previous loop.
1556 */
1557 if (!net_eq(dev_net(t->dev), net))
1558 unregister_netdevice_queue(t->dev,
1559 head);
c12b395a 1560 t = rtnl_dereference(t->next);
1561 }
1562 }
1563 }
1564}
1565
1566static int __net_init ip6gre_init_net(struct net *net)
1567{
1568 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1569 int err;
1570
79134e6c
ED		 1571 if (!net_has_fallback_tunnels(net))
1572 return 0;
c12b395a 1573 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
c835a677
TG		 1574 NET_NAME_UNKNOWN,
1575 ip6gre_tunnel_setup);
c12b395a 1576 if (!ign->fb_tunnel_dev) {
1577 err = -ENOMEM;
1578 goto err_alloc_dev;
1579 }
1580 dev_net_set(ign->fb_tunnel_dev, net);
22f08069
ND		 1581 /* FB netdevice is special: we have one, and only one per netns.
1582 * Allowing to move it to another netns is clearly unsafe.
1583 */
1584 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1585
c12b395a 1586
1587 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1588 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1589
1590 err = register_netdev(ign->fb_tunnel_dev);
1591 if (err)
1592 goto err_reg_dev;
1593
1594 rcu_assign_pointer(ign->tunnels_wc[0],
1595 netdev_priv(ign->fb_tunnel_dev));
1596 return 0;
1597
1598err_reg_dev:
cf124db5 1599 free_netdev(ign->fb_tunnel_dev);
c12b395a 1600err_alloc_dev:
1601 return err;
1602}
1603
bb401cae 1604static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
c12b395a 1605{
bb401cae 1606 struct net *net;
c12b395a 1607 LIST_HEAD(list);
1608
c12b395a 1609 rtnl_lock();
bb401cae
ED		 1610 list_for_each_entry(net, net_list, exit_list)
1611 ip6gre_destroy_tunnels(net, &list);
c12b395a 1612 unregister_netdevice_many(&list);
1613 rtnl_unlock();
1614}
1615
1616static struct pernet_operations ip6gre_net_ops = {
1617 .init = ip6gre_init_net,
bb401cae 1618 .exit_batch = ip6gre_exit_batch_net,
c12b395a 1619 .id = &ip6gre_net_id,
1620 .size = sizeof(struct ip6gre_net),
1621};
1622
a8b8a889
MS		 1623static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1624 struct netlink_ext_ack *extack)
c12b395a 1625{
1626 __be16 flags;
1627
1628 if (!data)
1629 return 0;
1630
1631 flags = 0;
1632 if (data[IFLA_GRE_IFLAGS])
1633 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1634 if (data[IFLA_GRE_OFLAGS])
1635 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1636 if (flags & (GRE_VERSION|GRE_ROUTING))
1637 return -EINVAL;
1638
1639 return 0;
1640}
1641
a8b8a889
MS		 1642static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1643 struct netlink_ext_ack *extack)
c12b395a 1644{
1645 struct in6_addr daddr;
1646
1647 if (tb[IFLA_ADDRESS]) {
1648 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1649 return -EINVAL;
1650 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1651 return -EADDRNOTAVAIL;
1652 }
1653
1654 if (!data)
1655 goto out;
1656
1657 if (data[IFLA_GRE_REMOTE]) {
67b61f6c 1658 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
c12b395a 1659 if (ipv6_addr_any(&daddr))
1660 return -EINVAL;
1661 }
1662
1663out:
a8b8a889 1664 return ip6gre_tunnel_validate(tb, data, extack);
c12b395a 1665}
1666
5a963eb6
WT		 1667static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1668 struct netlink_ext_ack *extack)
1669{
1670 __be16 flags = 0;
94d7d8f2 1671 int ret, ver = 0;
5a963eb6
WT		 1672
1673 if (!data)
1674 return 0;
1675
1676 ret = ip6gre_tap_validate(tb, data, extack);
1677 if (ret)
1678 return ret;
1679
1680 /* ERSPAN should only have GRE sequence and key flag */
1681 if (data[IFLA_GRE_OFLAGS])
1682 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1683 if (data[IFLA_GRE_IFLAGS])
1684 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1685 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1686 flags != (GRE_SEQ | GRE_KEY))
1687 return -EINVAL;
1688
1689 /* ERSPAN Session ID only has 10-bit. Since we reuse
1690 * 32-bit key field as ID, check it's range.
1691 */
1692 if (data[IFLA_GRE_IKEY] &&
1693 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1694 return -EINVAL;
1695
1696 if (data[IFLA_GRE_OKEY] &&
1697 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1698 return -EINVAL;
1699
94d7d8f2
WT		 1700 if (data[IFLA_GRE_ERSPAN_VER]) {
1701 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1702 if (ver != 1 && ver != 2)
5a963eb6
WT		 1703 return -EINVAL;
1704 }
94d7d8f2
WT		 1705
1706 if (ver == 1) {
1707 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1708 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1709
1710 if (index & ~INDEX_MASK)
1711 return -EINVAL;
1712 }
1713 } else if (ver == 2) {
1714 if (data[IFLA_GRE_ERSPAN_DIR]) {
1715 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1716
1717 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1718 return -EINVAL;
1719 }
1720
1721 if (data[IFLA_GRE_ERSPAN_HWID]) {
1722 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1723
1724 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1725 return -EINVAL;
1726 }
1727 }
1728
5a963eb6
WT		 1729 return 0;
1730}
c12b395a 1731
1732static void ip6gre_netlink_parms(struct nlattr *data[],
1733 struct __ip6_tnl_parm *parms)
1734{
1735 memset(parms, 0, sizeof(*parms));
1736
1737 if (!data)
1738 return;
1739
1740 if (data[IFLA_GRE_LINK])
1741 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1742
1743 if (data[IFLA_GRE_IFLAGS])
f41fe3c2
TH		 1744 parms->i_flags = gre_flags_to_tnl_flags(
1745 nla_get_be16(data[IFLA_GRE_IFLAGS]));
c12b395a 1746
1747 if (data[IFLA_GRE_OFLAGS])
f41fe3c2
TH		 1748 parms->o_flags = gre_flags_to_tnl_flags(
1749 nla_get_be16(data[IFLA_GRE_OFLAGS]));
c12b395a 1750
1751 if (data[IFLA_GRE_IKEY])
1752 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1753
1754 if (data[IFLA_GRE_OKEY])
1755 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1756
1757 if (data[IFLA_GRE_LOCAL])
67b61f6c 1758 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
c12b395a 1759
1760 if (data[IFLA_GRE_REMOTE])
67b61f6c 1761 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
c12b395a 1762
1763 if (data[IFLA_GRE_TTL])
1764 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1765
1766 if (data[IFLA_GRE_ENCAP_LIMIT])
1767 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1768
1769 if (data[IFLA_GRE_FLOWINFO])
c2675de4 1770 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
c12b395a 1771
1772 if (data[IFLA_GRE_FLAGS])
1773 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
0a473b82
CG		 1774
1775 if (data[IFLA_GRE_FWMARK])
1776 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
5a963eb6 1777
6712abc1
WT		 1778 if (data[IFLA_GRE_COLLECT_METADATA])
1779 parms->collect_md = true;
94d7d8f2
WT		 1780
1781 if (data[IFLA_GRE_ERSPAN_VER])
1782 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1783
1784 if (parms->erspan_ver == 1) {
1785 if (data[IFLA_GRE_ERSPAN_INDEX])
1786 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1787 } else if (parms->erspan_ver == 2) {
1788 if (data[IFLA_GRE_ERSPAN_DIR])
1789 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1790 if (data[IFLA_GRE_ERSPAN_HWID])
1791 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1792 }
c12b395a 1793}
1794
1795static int ip6gre_tap_init(struct net_device *dev)
1796{
a3c119d3 1797 int ret;
c12b395a 1798
a3c119d3
MKL		 1799 ret = ip6gre_tunnel_init_common(dev);
1800 if (ret)
1801 return ret;
c12b395a 1802
0a46baaf
SC		 1803 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1804
c12b395a 1805 return 0;
1806}
1807
1808static const struct net_device_ops ip6gre_tap_netdev_ops = {
1809 .ndo_init = ip6gre_tap_init,
1810 .ndo_uninit = ip6gre_tunnel_uninit,
1811 .ndo_start_xmit = ip6gre_tunnel_xmit,
1812 .ndo_set_mac_address = eth_mac_addr,
1813 .ndo_validate_addr = eth_validate_addr,
b05229f4 1814 .ndo_change_mtu = ip6_tnl_change_mtu,
f61dd388 1815 .ndo_get_stats64 = ip_tunnel_get_stats64,
ecf2c06a 1816 .ndo_get_iflink = ip6_tnl_get_iflink,
c12b395a 1817};
1818
2d665034
PM		 1819static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1820{
1821 int t_hlen;
1822
1823 tunnel->tun_hlen = 8;
1824 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1825 erspan_hdr_len(tunnel->parms.erspan_ver);
1826
1827 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
eb95f52f 1828 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
2d665034
PM		 1829 return t_hlen;
1830}
1831
5a963eb6
WT		 1832static int ip6erspan_tap_init(struct net_device *dev)
1833{
1834 struct ip6_tnl *tunnel;
1835 int t_hlen;
1836 int ret;
1837
1838 tunnel = netdev_priv(dev);
1839
1840 tunnel->dev = dev;
1841 tunnel->net = dev_net(dev);
1842 strcpy(tunnel->parms.name, dev->name);
1843
1844 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1845 if (!dev->tstats)
1846 return -ENOMEM;
1847
1848 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
0c1dd2a1
EBE		 1849 if (ret)
1850 goto cleanup_alloc_pcpu_stats;
1851
1852 ret = gro_cells_init(&tunnel->gro_cells, dev);
1853 if (ret)
1854 goto cleanup_dst_cache_init;
5a963eb6 1855
2d665034 1856 t_hlen = ip6erspan_calc_hlen(tunnel);
5a963eb6
WT		 1857 dev->mtu = ETH_DATA_LEN - t_hlen;
1858 if (dev->type == ARPHRD_ETHER)
1859 dev->mtu -= ETH_HLEN;
1860 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1861 dev->mtu -= 8;
1862
1863 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2d665034 1864 ip6erspan_tnl_link_config(tunnel, 1);
5a963eb6
WT		 1865
1866 return 0;
0c1dd2a1
EBE		 1867
1868cleanup_dst_cache_init:
1869 dst_cache_destroy(&tunnel->dst_cache);
1870cleanup_alloc_pcpu_stats:
1871 free_percpu(dev->tstats);
1872 dev->tstats = NULL;
1873 return ret;
5a963eb6
WT		 1874}
1875
1876static const struct net_device_ops ip6erspan_netdev_ops = {
1877 .ndo_init = ip6erspan_tap_init,
b80d0b93 1878 .ndo_uninit = ip6erspan_tunnel_uninit,
5a963eb6
WT		 1879 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1880 .ndo_set_mac_address = eth_mac_addr,
1881 .ndo_validate_addr = eth_validate_addr,
1882 .ndo_change_mtu = ip6_tnl_change_mtu,
1883 .ndo_get_stats64 = ip_tunnel_get_stats64,
1884 .ndo_get_iflink = ip6_tnl_get_iflink,
1885};
1886
c12b395a 1887static void ip6gre_tap_setup(struct net_device *dev)
1888{
1889
1890 ether_setup(dev);
1891
2c52129a 1892 dev->max_mtu = 0;
c12b395a 1893 dev->netdev_ops = &ip6gre_tap_netdev_ops;
cf124db5
DM		 1894 dev->needs_free_netdev = true;
1895 dev->priv_destructor = ip6gre_dev_free;
c12b395a 1896
c12b395a 1897 dev->features |= NETIF_F_NETNS_LOCAL;
d13b161c 1898 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
0a46baaf 1899 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2d40557c 1900 netif_keep_dst(dev);
c12b395a 1901}
1902
d1b2a6c4
PM		 1903bool is_ip6gretap_dev(const struct net_device *dev)
1904{
1905 return dev->netdev_ops == &ip6gre_tap_netdev_ops;
1906}
1907EXPORT_SYMBOL_GPL(is_ip6gretap_dev);
1908
1faf3d9f
TH		 1909static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1910 struct ip_tunnel_encap *ipencap)
1911{
1912 bool ret = false;
1913
1914 memset(ipencap, 0, sizeof(*ipencap));
1915
1916 if (!data)
1917 return ret;
1918
1919 if (data[IFLA_GRE_ENCAP_TYPE]) {
1920 ret = true;
1921 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1922 }
1923
1924 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1925 ret = true;
1926 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1927 }
1928
1929 if (data[IFLA_GRE_ENCAP_SPORT]) {
1930 ret = true;
1931 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1932 }
1933
1934 if (data[IFLA_GRE_ENCAP_DPORT]) {
1935 ret = true;
1936 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1937 }
1938
1939 return ret;
1940}
1941
7fa38a7c
PM		 1942static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1943 struct nlattr *tb[], struct nlattr *data[],
1944 struct netlink_ext_ack *extack)
c12b395a 1945{
1946 struct ip6_tnl *nt;
1faf3d9f 1947 struct ip_tunnel_encap ipencap;
c12b395a 1948 int err;
1949
1950 nt = netdev_priv(dev);
1faf3d9f
TH		 1951
1952 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1953 int err = ip6_tnl_encap_setup(nt, &ipencap);
1954
1955 if (err < 0)
1956 return err;
1957 }
1958
c12b395a 1959 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1960 eth_hw_addr_random(dev);
1961
1962 nt->dev = dev;
0bd87628 1963 nt->net = dev_net(dev);
c12b395a 1964
c12b395a 1965 err = register_netdevice(dev);
1966 if (err)
1967 goto out;
1968
128bb975
AK		 1969 if (tb[IFLA_MTU])
1970 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1971
c12b395a 1972 dev_hold(dev);
c12b395a 1973
1974out:
1975 return err;
1976}
1977
7fa38a7c
PM		 1978static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1979 struct nlattr *tb[], struct nlattr *data[],
1980 struct netlink_ext_ack *extack)
1981{
7fa38a7c
PM		 1982 struct ip6_tnl *nt = netdev_priv(dev);
1983 struct net *net = dev_net(dev);
b80d0b93
WT		 1984 struct ip6gre_net *ign;
1985 int err;
1986
1987 ip6gre_netlink_parms(data, &nt->parms);
1988 ign = net_generic(net, ip6gre_net_id);
1989
1990 if (nt->parms.collect_md) {
1991 if (rtnl_dereference(ign->collect_md_tun))
1992 return -EEXIST;
1993 } else {
1994 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1995 return -EEXIST;
1996 }
7fa38a7c 1997
b80d0b93 1998 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
7fa38a7c
PM		 1999 if (!err) {
2000 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
b80d0b93 2001 ip6gre_tunnel_link_md(ign, nt);
7fa38a7c
PM		 2002 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2003 }
2004 return err;
2005}
2006
c8632fc3
PM		 2007static struct ip6_tnl *
2008ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2009 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2010 struct netlink_ext_ack *extack)
c12b395a 2011{
22f08069
ND		 2012 struct ip6_tnl *t, *nt = netdev_priv(dev);
2013 struct net *net = nt->net;
c12b395a 2014 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1faf3d9f 2015 struct ip_tunnel_encap ipencap;
c12b395a 2016
2017 if (dev == ign->fb_tunnel_dev)
c8632fc3 2018 return ERR_PTR(-EINVAL);
c12b395a 2019
1faf3d9f
TH		 2020 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2021 int err = ip6_tnl_encap_setup(nt, &ipencap);
2022
2023 if (err < 0)
c8632fc3 2024 return ERR_PTR(err);
1faf3d9f
TH		 2025 }
2026
c8632fc3 2027 ip6gre_netlink_parms(data, p_p);
c12b395a 2028
c8632fc3 2029 t = ip6gre_tunnel_locate(net, p_p, 0);
c12b395a 2030
2031 if (t) {
2032 if (t->dev != dev)
c8632fc3 2033 return ERR_PTR(-EEXIST);
c12b395a 2034 } else {
2035 t = nt;
c12b395a 2036 }
2037
c8632fc3
PM		 2038 return t;
2039}
2040
2041static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2042 struct nlattr *data[],
2043 struct netlink_ext_ack *extack)
2044{
2045 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2046 struct __ip6_tnl_parm p;
2047 struct ip6_tnl *t;
2048
2049 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2050 if (IS_ERR(t))
2051 return PTR_ERR(t);
2052
b80d0b93 2053 ip6gre_tunnel_unlink_md(ign, t);
6a61d4db
ND		 2054 ip6gre_tunnel_unlink(ign, t);
2055 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
b80d0b93 2056 ip6gre_tunnel_link_md(ign, t);
6a61d4db 2057 ip6gre_tunnel_link(ign, t);
c12b395a 2058 return 0;
2059}
2060
54d63f78
ND		 2061static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2062{
2063 struct net *net = dev_net(dev);
2064 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2065
2066 if (dev != ign->fb_tunnel_dev)
2067 unregister_netdevice_queue(dev, head);
2068}
2069
c12b395a 2070static size_t ip6gre_get_size(const struct net_device *dev)
2071{
2072 return
2073 /* IFLA_GRE_LINK */
2074 nla_total_size(4) +
2075 /* IFLA_GRE_IFLAGS */
2076 nla_total_size(2) +
2077 /* IFLA_GRE_OFLAGS */
2078 nla_total_size(2) +
2079 /* IFLA_GRE_IKEY */
2080 nla_total_size(4) +
2081 /* IFLA_GRE_OKEY */
2082 nla_total_size(4) +
2083 /* IFLA_GRE_LOCAL */
a3754133 2084 nla_total_size(sizeof(struct in6_addr)) +
c12b395a 2085 /* IFLA_GRE_REMOTE */
a3754133 2086 nla_total_size(sizeof(struct in6_addr)) +
c12b395a 2087 /* IFLA_GRE_TTL */
2088 nla_total_size(1) +
c12b395a 2089 /* IFLA_GRE_ENCAP_LIMIT */
2090 nla_total_size(1) +
2091 /* IFLA_GRE_FLOWINFO */
2092 nla_total_size(4) +
2093 /* IFLA_GRE_FLAGS */
2094 nla_total_size(4) +
1faf3d9f
TH		 2095 /* IFLA_GRE_ENCAP_TYPE */
2096 nla_total_size(2) +
2097 /* IFLA_GRE_ENCAP_FLAGS */
2098 nla_total_size(2) +
2099 /* IFLA_GRE_ENCAP_SPORT */
2100 nla_total_size(2) +
2101 /* IFLA_GRE_ENCAP_DPORT */
2102 nla_total_size(2) +
6712abc1
WT		 2103 /* IFLA_GRE_COLLECT_METADATA */
2104 nla_total_size(0) +
0a473b82
CG		 2105 /* IFLA_GRE_FWMARK */
2106 nla_total_size(4) +
5a963eb6
WT		 2107 /* IFLA_GRE_ERSPAN_INDEX */
2108 nla_total_size(4) +
c12b395a 2109 0;
2110}
2111
2112static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2113{
2114 struct ip6_tnl *t = netdev_priv(dev);
2115 struct __ip6_tnl_parm *p = &t->parms;
2116
2117 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
f41fe3c2
TH		 2118 nla_put_be16(skb, IFLA_GRE_IFLAGS,
2119 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2120 nla_put_be16(skb, IFLA_GRE_OFLAGS,
2121 gre_tnl_flags_to_gre_flags(p->o_flags)) ||
c12b395a 2122 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2123 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
930345ea
JB		 2124 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2125 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
c12b395a 2126 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
c12b395a 2127 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2128 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
0a473b82 2129 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
5a963eb6
WT		 2130 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark) ||
2131 nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
c12b395a 2132 goto nla_put_failure;
1faf3d9f
TH		 2133
2134 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2135 t->encap.type) ||
2136 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2137 t->encap.sport) ||
2138 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2139 t->encap.dport) ||
2140 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2141 t->encap.flags))
2142 goto nla_put_failure;
2143
6712abc1
WT		 2144 if (p->collect_md) {
2145 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2146 goto nla_put_failure;
2147 }
2148
94d7d8f2
WT		 2149 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2150 goto nla_put_failure;
2151
2152 if (p->erspan_ver == 1) {
2153 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2154 goto nla_put_failure;
2155 } else if (p->erspan_ver == 2) {
2156 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2157 goto nla_put_failure;
2158 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2159 goto nla_put_failure;
2160 }
2161
c12b395a 2162 return 0;
2163
2164nla_put_failure:
2165 return -EMSGSIZE;
2166}
2167
2168static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2169 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2170 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2171 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2172 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2173 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2174 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
2175 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
2176 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2177 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2178 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2179 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1faf3d9f
TH		 2180 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2181 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2182 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2183 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
6712abc1 2184 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
0a473b82 2185 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
5a963eb6 2186 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
94d7d8f2
WT		 2187 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2188 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2189 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
c12b395a 2190};
2191
5a963eb6
WT		 2192static void ip6erspan_tap_setup(struct net_device *dev)
2193{
2194 ether_setup(dev);
2195
2196 dev->netdev_ops = &ip6erspan_netdev_ops;
2197 dev->needs_free_netdev = true;
2198 dev->priv_destructor = ip6gre_dev_free;
2199
2200 dev->features |= NETIF_F_NETNS_LOCAL;
2201 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2202 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2203 netif_keep_dst(dev);
2204}
2205
2d665034
PM		 2206static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2207 struct nlattr *tb[], struct nlattr *data[],
2208 struct netlink_ext_ack *extack)
2209{
2d665034
PM		 2210 struct ip6_tnl *nt = netdev_priv(dev);
2211 struct net *net = dev_net(dev);
b80d0b93
WT		 2212 struct ip6gre_net *ign;
2213 int err;
2214
2215 ip6gre_netlink_parms(data, &nt->parms);
2216 ign = net_generic(net, ip6gre_net_id);
2217
2218 if (nt->parms.collect_md) {
2219 if (rtnl_dereference(ign->collect_md_tun_erspan))
2220 return -EEXIST;
2221 } else {
2222 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2223 return -EEXIST;
2224 }
2d665034 2225
b80d0b93 2226 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2d665034
PM		 2227 if (!err) {
2228 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
b80d0b93 2229 ip6erspan_tunnel_link_md(ign, nt);
2d665034
PM		 2230 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2231 }
2232 return err;
2233}
2234
2235static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2236{
2237 ip6gre_tnl_link_config_common(t);
2238 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2239}
2240
2241static int ip6erspan_tnl_change(struct ip6_tnl *t,
2242 const struct __ip6_tnl_parm *p, int set_mtu)
2243{
2244 ip6gre_tnl_copy_tnl_parm(t, p);
2245 ip6erspan_tnl_link_config(t, set_mtu);
2246 return 0;
2247}
2248
2249static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2250 struct nlattr *data[],
2251 struct netlink_ext_ack *extack)
2252{
2253 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2254 struct __ip6_tnl_parm p;
2255 struct ip6_tnl *t;
2256
2257 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2258 if (IS_ERR(t))
2259 return PTR_ERR(t);
2260
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 (xeb@mail.ru)");
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");
Linux 6.x block layer and io_uring tree(s)