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Merge branch 'enic-update'
[linux.git] / net / ipv6 / ip6_gre.c
CommitLineData
c12b395a 1/*
2 * GRE over IPv6 protocol decoder.
3 *
4 * Authors: Dmitry Kozlov ([email protected])
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;
c12b395a 74 struct net_device *fb_tunnel_dev;
75};
76
77static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
22f08069 78static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
5a963eb6 79static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly;
c12b395a 80static int ip6gre_tunnel_init(struct net_device *dev);
81static void ip6gre_tunnel_setup(struct net_device *dev);
82static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
83static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
84
85/* Tunnel hash table */
86
87/*
88 4 hash tables:
89
90 3: (remote,local)
91 2: (remote,*)
92 1: (*,local)
93 0: (*,*)
94
95 We require exact key match i.e. if a key is present in packet
96 it will match only tunnel with the same key; if it is not present,
97 it will match only keyless tunnel.
98
99 All keysless packets, if not matched configured keyless tunnels
100 will match fallback tunnel.
101 */
102
e87a8f24 103#define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
c12b395a 104static u32 HASH_ADDR(const struct in6_addr *addr)
105{
106 u32 hash = ipv6_addr_hash(addr);
107
e87a8f24 108 return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
c12b395a 109}
110
111#define tunnels_r_l tunnels[3]
112#define tunnels_r tunnels[2]
113#define tunnels_l tunnels[1]
114#define tunnels_wc tunnels[0]
c12b395a 115
c12b395a 116/* Given src, dst and key, find appropriate for input tunnel. */
117
118static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
119 const struct in6_addr *remote, const struct in6_addr *local,
120 __be32 key, __be16 gre_proto)
121{
122 struct net *net = dev_net(dev);
123 int link = dev->ifindex;
124 unsigned int h0 = HASH_ADDR(remote);
125 unsigned int h1 = HASH_KEY(key);
126 struct ip6_tnl *t, *cand = NULL;
127 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
5a963eb6
WT		 128 int dev_type = (gre_proto == htons(ETH_P_TEB) ||
129 gre_proto == htons(ETH_P_ERSPAN)) ?
c12b395a 130 ARPHRD_ETHER : ARPHRD_IP6GRE;
131 int score, cand_score = 4;
132
e086cadc 133 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
c12b395a 134 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
135 !ipv6_addr_equal(remote, &t->parms.raddr) ||
136 key != t->parms.i_key ||
137 !(t->dev->flags & IFF_UP))
138 continue;
139
140 if (t->dev->type != ARPHRD_IP6GRE &&
141 t->dev->type != dev_type)
142 continue;
143
144 score = 0;
145 if (t->parms.link != link)
146 score |= 1;
147 if (t->dev->type != dev_type)
148 score |= 2;
149 if (score == 0)
150 return t;
151
152 if (score < cand_score) {
153 cand = t;
154 cand_score = score;
155 }
156 }
157
e086cadc 158 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
c12b395a 159 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
160 key != t->parms.i_key ||
161 !(t->dev->flags & IFF_UP))
162 continue;
163
164 if (t->dev->type != ARPHRD_IP6GRE &&
165 t->dev->type != dev_type)
166 continue;
167
168 score = 0;
169 if (t->parms.link != link)
170 score |= 1;
171 if (t->dev->type != dev_type)
172 score |= 2;
173 if (score == 0)
174 return t;
175
176 if (score < cand_score) {
177 cand = t;
178 cand_score = score;
179 }
180 }
181
e086cadc 182 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
c12b395a 183 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
184 (!ipv6_addr_equal(local, &t->parms.raddr) ||
185 !ipv6_addr_is_multicast(local))) ||
186 key != t->parms.i_key ||
187 !(t->dev->flags & IFF_UP))
188 continue;
189
190 if (t->dev->type != ARPHRD_IP6GRE &&
191 t->dev->type != dev_type)
192 continue;
193
194 score = 0;
195 if (t->parms.link != link)
196 score |= 1;
197 if (t->dev->type != dev_type)
198 score |= 2;
199 if (score == 0)
200 return t;
201
202 if (score < cand_score) {
203 cand = t;
204 cand_score = score;
205 }
206 }
207
e086cadc 208 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
c12b395a 209 if (t->parms.i_key != key ||
210 !(t->dev->flags & IFF_UP))
211 continue;
212
213 if (t->dev->type != ARPHRD_IP6GRE &&
214 t->dev->type != dev_type)
215 continue;
216
217 score = 0;
218 if (t->parms.link != link)
219 score |= 1;
220 if (t->dev->type != dev_type)
221 score |= 2;
222 if (score == 0)
223 return t;
224
225 if (score < cand_score) {
226 cand = t;
227 cand_score = score;
228 }
229 }
230
53b24b8f 231 if (cand)
c12b395a 232 return cand;
233
6712abc1
WT		 234 t = rcu_dereference(ign->collect_md_tun);
235 if (t && t->dev->flags & IFF_UP)
236 return t;
237
c12b395a 238 dev = ign->fb_tunnel_dev;
239 if (dev->flags & IFF_UP)
240 return netdev_priv(dev);
241
242 return NULL;
243}
244
245static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
246 const struct __ip6_tnl_parm *p)
247{
248 const struct in6_addr *remote = &p->raddr;
249 const struct in6_addr *local = &p->laddr;
250 unsigned int h = HASH_KEY(p->i_key);
251 int prio = 0;
252
253 if (!ipv6_addr_any(local))
254 prio |= 1;
255 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
256 prio |= 2;
257 h ^= HASH_ADDR(remote);
258 }
259
260 return &ign->tunnels[prio][h];
261}
262
263static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
264 const struct ip6_tnl *t)
265{
266 return __ip6gre_bucket(ign, &t->parms);
267}
268
269static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
270{
271 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
272
6712abc1
WT		 273 if (t->parms.collect_md)
274 rcu_assign_pointer(ign->collect_md_tun, t);
275
c12b395a 276 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
277 rcu_assign_pointer(*tp, t);
278}
279
280static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
281{
282 struct ip6_tnl __rcu **tp;
283 struct ip6_tnl *iter;
284
6712abc1
WT		 285 if (t->parms.collect_md)
286 rcu_assign_pointer(ign->collect_md_tun, NULL);
287
c12b395a 288 for (tp = ip6gre_bucket(ign, t);
289 (iter = rtnl_dereference(*tp)) != NULL;
290 tp = &iter->next) {
291 if (t == iter) {
292 rcu_assign_pointer(*tp, t->next);
293 break;
294 }
295 }
296}
297
298static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
299 const struct __ip6_tnl_parm *parms,
300 int type)
301{
302 const struct in6_addr *remote = &parms->raddr;
303 const struct in6_addr *local = &parms->laddr;
304 __be32 key = parms->i_key;
305 int link = parms->link;
306 struct ip6_tnl *t;
307 struct ip6_tnl __rcu **tp;
308 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
309
310 for (tp = __ip6gre_bucket(ign, parms);
311 (t = rtnl_dereference(*tp)) != NULL;
312 tp = &t->next)
313 if (ipv6_addr_equal(local, &t->parms.laddr) &&
314 ipv6_addr_equal(remote, &t->parms.raddr) &&
315 key == t->parms.i_key &&
316 link == t->parms.link &&
317 type == t->dev->type)
318 break;
319
320 return t;
321}
322
323static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
324 const struct __ip6_tnl_parm *parms, int create)
325{
326 struct ip6_tnl *t, *nt;
327 struct net_device *dev;
328 char name[IFNAMSIZ];
329 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
330
331 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
cd0a0bd9
SK		 332 if (t && create)
333 return NULL;
c12b395a 334 if (t || !create)
335 return t;
336
337 if (parms->name[0])
338 strlcpy(name, parms->name, IFNAMSIZ);
339 else
340 strcpy(name, "ip6gre%d");
341
c835a677
TG		 342 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
343 ip6gre_tunnel_setup);
c12b395a 344 if (!dev)
345 return NULL;
346
347 dev_net_set(dev, net);
348
349 nt = netdev_priv(dev);
350 nt->parms = *parms;
351 dev->rtnl_link_ops = &ip6gre_link_ops;
352
353 nt->dev = dev;
0bd87628 354 nt->net = dev_net(dev);
c12b395a 355
356 if (register_netdevice(dev) < 0)
357 goto failed_free;
358
128bb975
AK		 359 ip6gre_tnl_link_config(nt, 1);
360
c12b395a 361 /* Can use a lockless transmit, unless we generate output sequences */
b45bd1d7 362 if (!(nt->parms.o_flags & TUNNEL_SEQ))
c12b395a 363 dev->features |= NETIF_F_LLTX;
364
365 dev_hold(dev);
366 ip6gre_tunnel_link(ign, nt);
367 return nt;
368
369failed_free:
370 free_netdev(dev);
371 return NULL;
372}
373
374static void ip6gre_tunnel_uninit(struct net_device *dev)
375{
22f08069
ND		 376 struct ip6_tnl *t = netdev_priv(dev);
377 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
c12b395a 378
22f08069 379 ip6gre_tunnel_unlink(ign, t);
607f725f 380 dst_cache_reset(&t->dst_cache);
c12b395a 381 dev_put(dev);
382}
383
384
385static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
7892032c 386 u8 type, u8 code, int offset, __be32 info)
c12b395a 387{
929fc032 388 struct net *net = dev_net(skb->dev);
7892032c
ED		 389 const struct gre_base_hdr *greh;
390 const struct ipv6hdr *ipv6h;
391 int grehlen = sizeof(*greh);
c12b395a 392 struct ip6_tnl *t;
7892032c 393 int key_off = 0;
c12b395a 394 __be16 flags;
7892032c 395 __be32 key;
c12b395a 396
7892032c
ED		 397 if (!pskb_may_pull(skb, offset + grehlen))
398 return;
399 greh = (const struct gre_base_hdr *)(skb->data + offset);
400 flags = greh->flags;
401 if (flags & (GRE_VERSION | GRE_ROUTING))
402 return;
403 if (flags & GRE_CSUM)
404 grehlen += 4;
405 if (flags & GRE_KEY) {
406 key_off = grehlen + offset;
407 grehlen += 4;
c12b395a 408 }
409
7892032c 410 if (!pskb_may_pull(skb, offset + grehlen))
c12b395a 411 return;
b87fb39e 412 ipv6h = (const struct ipv6hdr *)skb->data;
7892032c
ED		 413 greh = (const struct gre_base_hdr *)(skb->data + offset);
414 key = key_off ? *(__be32 *)(skb->data + key_off) : 0;
c12b395a 415
c12b395a 416 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
7892032c 417 key, greh->protocol);
63159f29 418 if (!t)
0c5794a6 419 return;
c12b395a 420
421 switch (type) {
c12b395a 422 struct ipv6_tlv_tnl_enc_lim *tel;
fe1a4ca0 423 __u32 teli;
c12b395a 424 case ICMPV6_DEST_UNREACH:
a46496ce
MB		 425 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
426 t->parms.name);
f8d20b46
XL		 427 if (code != ICMPV6_PORT_UNREACH)
428 break;
429 return;
c12b395a 430 case ICMPV6_TIME_EXCEED:
431 if (code == ICMPV6_EXC_HOPLIMIT) {
a46496ce
MB		 432 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
433 t->parms.name);
f8d20b46 434 break;
c12b395a 435 }
f8d20b46 436 return;
c12b395a 437 case ICMPV6_PARAMPROB:
438 teli = 0;
439 if (code == ICMPV6_HDR_FIELD)
440 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
441
d1e158e2 442 if (teli && teli == be32_to_cpu(info) - 2) {
c12b395a 443 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
444 if (tel->encap_limit == 0) {
a46496ce
MB		 445 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
446 t->parms.name);
c12b395a 447 }
448 } else {
a46496ce
MB		 449 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
450 t->parms.name);
c12b395a 451 }
f8d20b46 452 return;
c12b395a 453 case ICMPV6_PKT_TOOBIG:
fe1a4ca0 454 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
f8d20b46 455 return;
929fc032
XL		 456 case NDISC_REDIRECT:
457 ip6_redirect(skb, net, skb->dev->ifindex, 0,
458 sock_net_uid(net, NULL));
459 return;
c12b395a 460 }
461
462 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
463 t->err_count++;
464 else
465 t->err_count = 1;
466 t->err_time = jiffies;
c12b395a 467}
468
308edfdf 469static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
c12b395a 470{
471 const struct ipv6hdr *ipv6h;
c12b395a 472 struct ip6_tnl *tunnel;
c12b395a 473
474 ipv6h = ipv6_hdr(skb);
c12b395a 475 tunnel = ip6gre_tunnel_lookup(skb->dev,
308edfdf
TH		 476 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
477 tpi->proto);
c12b395a 478 if (tunnel) {
6712abc1
WT		 479 if (tunnel->parms.collect_md) {
480 struct metadata_dst *tun_dst;
481 __be64 tun_id;
482 __be16 flags;
483
484 flags = tpi->flags;
485 tun_id = key32_to_tunnel_id(tpi->key);
486
487 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
488 if (!tun_dst)
489 return PACKET_REJECT;
490
491 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
492 } else {
493 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
494 }
c12b395a 495
308edfdf
TH		 496 return PACKET_RCVD;
497 }
eccc1bb8 498
308edfdf
TH		 499 return PACKET_REJECT;
500}
eccc1bb8 501
5a963eb6
WT		 502static int ip6erspan_rcv(struct sk_buff *skb, int gre_hdr_len,
503 struct tnl_ptk_info *tpi)
504{
1d7e2ed2
WT		 505 struct erspan_base_hdr *ershdr;
506 struct erspan_metadata *pkt_md;
5a963eb6 507 const struct ipv6hdr *ipv6h;
3df19283 508 struct erspan_md2 *md2;
5a963eb6 509 struct ip6_tnl *tunnel;
1d7e2ed2 510 u8 ver;
5a963eb6 511
5a963eb6
WT		 512 if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr))))
513 return PACKET_REJECT;
514
293a1991
HY		 515 ipv6h = ipv6_hdr(skb);
516 ershdr = (struct erspan_base_hdr *)skb->data;
c69de58b
WT		 517 ver = ershdr->ver;
518 tpi->key = cpu_to_be32(get_session_id(ershdr));
5a963eb6
WT		 519
520 tunnel = ip6gre_tunnel_lookup(skb->dev,
521 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
522 tpi->proto);
523 if (tunnel) {
1d7e2ed2
WT		 524 int len = erspan_hdr_len(ver);
525
526 if (unlikely(!pskb_may_pull(skb, len)))
ae3e1337 527 return PACKET_REJECT;
1d7e2ed2 528
d91e8db5
WT		 529 ershdr = (struct erspan_base_hdr *)skb->data;
530 pkt_md = (struct erspan_metadata *)(ershdr + 1);
531
1d7e2ed2 532 if (__iptunnel_pull_header(skb, len,
5a963eb6
WT		 533 htons(ETH_P_TEB),
534 false, false) < 0)
535 return PACKET_REJECT;
536
ef7baf5e
WT		 537 if (tunnel->parms.collect_md) {
538 struct metadata_dst *tun_dst;
539 struct ip_tunnel_info *info;
540 struct erspan_metadata *md;
541 __be64 tun_id;
542 __be16 flags;
543
544 tpi->flags |= TUNNEL_KEY;
545 flags = tpi->flags;
546 tun_id = key32_to_tunnel_id(tpi->key);
547
548 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
549 sizeof(*md));
550 if (!tun_dst)
551 return PACKET_REJECT;
552
553 info = &tun_dst->u.tun_info;
554 md = ip_tunnel_info_opts(info);
94d7d8f2 555 md->version = ver;
3df19283
WT		 556 md2 = &md->u.md2;
557 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
558 ERSPAN_V2_MDSIZE);
ef7baf5e
WT		 559 info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
560 info->options_len = sizeof(*md);
561
562 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
563
564 } else {
ef7baf5e
WT		 565 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
566 }
5a963eb6
WT		 567
568 return PACKET_RCVD;
569 }
570
571 return PACKET_REJECT;
572}
573
308edfdf
TH		 574static int gre_rcv(struct sk_buff *skb)
575{
576 struct tnl_ptk_info tpi;
577 bool csum_err = false;
578 int hdr_len;
eccc1bb8 579
e582615a 580 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
f132ae7c 581 if (hdr_len < 0)
308edfdf 582 goto drop;
c12b395a 583
308edfdf
TH		 584 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
585 goto drop;
c12b395a 586
94d7d8f2
WT		 587 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
588 tpi.proto == htons(ETH_P_ERSPAN2))) {
5a963eb6
WT		 589 if (ip6erspan_rcv(skb, hdr_len, &tpi) == PACKET_RCVD)
590 return 0;
a7343211 591 goto out;
5a963eb6
WT		 592 }
593
308edfdf 594 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
c12b395a 595 return 0;
c12b395a 596
a7343211 597out:
308edfdf 598 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
c12b395a 599drop:
c12b395a 600 kfree_skb(skb);
601 return 0;
602}
603
b05229f4 604static int gre_handle_offloads(struct sk_buff *skb, bool csum)
c12b395a 605{
b05229f4
TH		 606 return iptunnel_handle_offloads(skb,
607 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
c12b395a 608}
609
898b2979
WT		 610static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
611 struct net_device *dev,
612 struct flowi6 *fl6, __u8 *dsfield,
613 int *encap_limit)
614{
615 const struct iphdr *iph = ip_hdr(skb);
616 struct ip6_tnl *t = netdev_priv(dev);
617
618 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
619 *encap_limit = t->parms.encap_limit;
620
621 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
622
623 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
624 *dsfield = ipv4_get_dsfield(iph);
625 else
626 *dsfield = ip6_tclass(t->parms.flowinfo);
627
628 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
629 fl6->flowi6_mark = skb->mark;
630 else
631 fl6->flowi6_mark = t->parms.fwmark;
632
633 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
634}
635
636static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
637 struct net_device *dev,
638 struct flowi6 *fl6, __u8 *dsfield,
639 int *encap_limit)
640{
641 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
642 struct ip6_tnl *t = netdev_priv(dev);
643 __u16 offset;
644
645 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
646 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
647
648 if (offset > 0) {
649 struct ipv6_tlv_tnl_enc_lim *tel;
650
651 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
652 if (tel->encap_limit == 0) {
653 icmpv6_send(skb, ICMPV6_PARAMPROB,
654 ICMPV6_HDR_FIELD, offset + 2);
655 return -1;
656 }
657 *encap_limit = tel->encap_limit - 1;
658 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
659 *encap_limit = t->parms.encap_limit;
660 }
661
662 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
663
664 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
665 *dsfield = ipv6_get_dsfield(ipv6h);
666 else
667 *dsfield = ip6_tclass(t->parms.flowinfo);
668
669 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
670 fl6->flowlabel |= ip6_flowlabel(ipv6h);
671
672 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
673 fl6->flowi6_mark = skb->mark;
674 else
675 fl6->flowi6_mark = t->parms.fwmark;
676
677 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
678
679 return 0;
680}
681
b05229f4
TH		 682static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
683 struct net_device *dev, __u8 dsfield,
684 struct flowi6 *fl6, int encap_limit,
685 __u32 *pmtu, __be16 proto)
c12b395a 686{
c12b395a 687 struct ip6_tnl *tunnel = netdev_priv(dev);
8aec4959 688 __be16 protocol;
c12b395a 689
690 if (dev->type == ARPHRD_ETHER)
691 IPCB(skb)->flags = 0;
692
b05229f4
TH		 693 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
694 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
695 else
c12b395a 696 fl6->daddr = tunnel->parms.raddr;
c12b395a 697
b05229f4
TH		 698 if (tunnel->parms.o_flags & TUNNEL_SEQ)
699 tunnel->o_seqno++;
c12b395a 700
b05229f4 701 /* Push GRE header. */
8aec4959 702 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
6712abc1
WT		 703
704 if (tunnel->parms.collect_md) {
705 struct ip_tunnel_info *tun_info;
706 const struct ip_tunnel_key *key;
707 __be16 flags;
708
709 tun_info = skb_tunnel_info(skb);
710 if (unlikely(!tun_info ||
711 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
712 ip_tunnel_info_af(tun_info) != AF_INET6))
713 return -EINVAL;
714
715 key = &tun_info->key;
716 memset(fl6, 0, sizeof(*fl6));
717 fl6->flowi6_proto = IPPROTO_GRE;
718 fl6->daddr = key->u.ipv6.dst;
719 fl6->flowlabel = key->label;
720 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
721
722 dsfield = key->tos;
723 flags = key->tun_flags & (TUNNEL_CSUM | TUNNEL_KEY);
724 tunnel->tun_hlen = gre_calc_hlen(flags);
725
726 gre_build_header(skb, tunnel->tun_hlen,
727 flags, protocol,
728 tunnel_id_to_key32(tun_info->key.tun_id), 0);
729
730 } else {
731 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
732 protocol, tunnel->parms.o_key,
733 htonl(tunnel->o_seqno));
734 }
c12b395a 735
b05229f4
TH		 736 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
737 NEXTHDR_GRE);
c12b395a 738}
739
740static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
741{
742 struct ip6_tnl *t = netdev_priv(dev);
c12b395a 743 int encap_limit = -1;
744 struct flowi6 fl6;
6712abc1 745 __u8 dsfield = 0;
c12b395a 746 __u32 mtu;
747 int err;
748
5146d1f1
BH		 749 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
750
6712abc1
WT		 751 if (!t->parms.collect_md)
752 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
753 &dsfield, &encap_limit);
e2d118a1 754
b05229f4
TH		 755 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
756 if (err)
757 return -1;
758
759 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
760 skb->protocol);
c12b395a 761 if (err != 0) {
762 /* XXX: send ICMP error even if DF is not set. */
763 if (err == -EMSGSIZE)
764 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
765 htonl(mtu));
766 return -1;
767 }
768
769 return 0;
770}
771
772static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
773{
774 struct ip6_tnl *t = netdev_priv(dev);
775 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
776 int encap_limit = -1;
c12b395a 777 struct flowi6 fl6;
6712abc1 778 __u8 dsfield = 0;
c12b395a 779 __u32 mtu;
780 int err;
781
782 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
783 return -1;
784
6712abc1
WT		 785 if (!t->parms.collect_md &&
786 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
898b2979 787 return -1;
e2d118a1 788
b05229f4
TH		 789 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
790 return -1;
791
792 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
793 &mtu, skb->protocol);
c12b395a 794 if (err != 0) {
795 if (err == -EMSGSIZE)
796 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
797 return -1;
798 }
799
800 return 0;
801}
802
803/**
804 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
805 * @t: the outgoing tunnel device
806 * @hdr: IPv6 header from the incoming packet
807 *
808 * Description:
809 * Avoid trivial tunneling loop by checking that tunnel exit-point
810 * doesn't match source of incoming packet.
811 *
812 * Return:
813 * 1 if conflict,
814 * 0 else
815 **/
816
817static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
818 const struct ipv6hdr *hdr)
819{
820 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
821}
822
823static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
824{
825 struct ip6_tnl *t = netdev_priv(dev);
826 int encap_limit = -1;
827 struct flowi6 fl6;
828 __u32 mtu;
829 int err;
830
831 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
832 encap_limit = t->parms.encap_limit;
833
6712abc1
WT		 834 if (!t->parms.collect_md)
835 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
c12b395a 836
b05229f4
TH		 837 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
838 if (err)
839 return err;
840
841 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
c12b395a 842
843 return err;
844}
845
846static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
847 struct net_device *dev)
848{
849 struct ip6_tnl *t = netdev_priv(dev);
850 struct net_device_stats *stats = &t->dev->stats;
851 int ret;
852
d5005140 853 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
41ab3e31 854 goto tx_err;
c12b395a 855
856 switch (skb->protocol) {
857 case htons(ETH_P_IP):
858 ret = ip6gre_xmit_ipv4(skb, dev);
859 break;
860 case htons(ETH_P_IPV6):
861 ret = ip6gre_xmit_ipv6(skb, dev);
862 break;
863 default:
864 ret = ip6gre_xmit_other(skb, dev);
865 break;
866 }
867
868 if (ret < 0)
869 goto tx_err;
870
871 return NETDEV_TX_OK;
872
873tx_err:
874 stats->tx_errors++;
875 stats->tx_dropped++;
876 kfree_skb(skb);
877 return NETDEV_TX_OK;
878}
879
5a963eb6
WT		 880static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
881 struct net_device *dev)
882{
883 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
884 struct ip6_tnl *t = netdev_priv(dev);
885 struct dst_entry *dst = skb_dst(skb);
886 struct net_device_stats *stats;
887 bool truncate = false;
888 int encap_limit = -1;
889 __u8 dsfield = false;
890 struct flowi6 fl6;
891 int err = -EINVAL;
892 __u32 mtu;
893
894 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
895 goto tx_err;
896
897 if (gre_handle_offloads(skb, false))
898 goto tx_err;
899
5a963eb6
WT		 900 if (skb->len > dev->mtu + dev->hard_header_len) {
901 pskb_trim(skb, dev->mtu + dev->hard_header_len);
902 truncate = true;
903 }
904
5a963eb6 905 t->parms.o_flags &= ~TUNNEL_KEY;
5a963eb6 906 IPCB(skb)->flags = 0;
ef7baf5e
WT		 907
908 /* For collect_md mode, derive fl6 from the tunnel key,
909 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
910 */
911 if (t->parms.collect_md) {
912 struct ip_tunnel_info *tun_info;
913 const struct ip_tunnel_key *key;
914 struct erspan_metadata *md;
c69de58b 915 __be32 tun_id;
ef7baf5e
WT		 916
917 tun_info = skb_tunnel_info(skb);
918 if (unlikely(!tun_info ||
919 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
920 ip_tunnel_info_af(tun_info) != AF_INET6))
921 return -EINVAL;
922
923 key = &tun_info->key;
924 memset(&fl6, 0, sizeof(fl6));
925 fl6.flowi6_proto = IPPROTO_GRE;
926 fl6.daddr = key->u.ipv6.dst;
927 fl6.flowlabel = key->label;
928 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
929
930 dsfield = key->tos;
931 md = ip_tunnel_info_opts(tun_info);
932 if (!md)
933 goto tx_err;
934
c69de58b 935 tun_id = tunnel_id_to_key32(key->tun_id);
94d7d8f2
WT		 936 if (md->version == 1) {
937 erspan_build_header(skb,
c69de58b 938 ntohl(tun_id),
94d7d8f2
WT		 939 ntohl(md->u.index), truncate,
940 false);
941 } else if (md->version == 2) {
94d7d8f2 942 erspan_build_header_v2(skb,
c69de58b
WT		 943 ntohl(tun_id),
944 md->u.md2.dir,
945 get_hwid(&md->u.md2),
946 truncate, false);
94d7d8f2 947 }
ef7baf5e
WT		 948 } else {
949 switch (skb->protocol) {
950 case htons(ETH_P_IP):
951 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
952 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
953 &dsfield, &encap_limit);
954 break;
955 case htons(ETH_P_IPV6):
956 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
957 goto tx_err;
958 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
959 &dsfield, &encap_limit))
960 goto tx_err;
961 break;
962 default:
963 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
964 break;
965 }
966
94d7d8f2 967 if (t->parms.erspan_ver == 1)
c69de58b 968 erspan_build_header(skb, ntohl(t->parms.o_key),
94d7d8f2
WT		 969 t->parms.index,
970 truncate, false);
971 else
c69de58b 972 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
94d7d8f2
WT		 973 t->parms.dir,
974 t->parms.hwid,
975 truncate, false);
ef7baf5e
WT		 976 fl6.daddr = t->parms.raddr;
977 }
5a963eb6
WT		 978
979 /* Push GRE header. */
980 gre_build_header(skb, 8, TUNNEL_SEQ,
981 htons(ETH_P_ERSPAN), 0, htonl(t->o_seqno++));
982
983 /* TooBig packet may have updated dst->dev's mtu */
ef7baf5e 984 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
5a963eb6
WT		 985 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu);
986
987 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
988 NEXTHDR_GRE);
989 if (err != 0) {
990 /* XXX: send ICMP error even if DF is not set. */
991 if (err == -EMSGSIZE) {
992 if (skb->protocol == htons(ETH_P_IP))
993 icmp_send(skb, ICMP_DEST_UNREACH,
994 ICMP_FRAG_NEEDED, htonl(mtu));
995 else
996 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
997 }
998
999 goto tx_err;
1000 }
1001 return NETDEV_TX_OK;
1002
1003tx_err:
1004 stats = &t->dev->stats;
1005 stats->tx_errors++;
1006 stats->tx_dropped++;
1007 kfree_skb(skb);
1008 return NETDEV_TX_OK;
1009}
1010
c12b395a 1011static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1012{
1013 struct net_device *dev = t->dev;
1014 struct __ip6_tnl_parm *p = &t->parms;
1015 struct flowi6 *fl6 = &t->fl.u.ip6;
db2ec95d 1016 int t_hlen;
c12b395a 1017
1018 if (dev->type != ARPHRD_ETHER) {
1019 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1020 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1021 }
1022
1023 /* Set up flowi template */
1024 fl6->saddr = p->laddr;
1025 fl6->daddr = p->raddr;
1026 fl6->flowi6_oif = p->link;
1027 fl6->flowlabel = 0;
252f3f5a 1028 fl6->flowi6_proto = IPPROTO_GRE;
c12b395a 1029
1030 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1031 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1032 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1033 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1034
1035 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1036 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1037
1038 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1039 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1040 dev->flags |= IFF_POINTOPOINT;
1041 else
1042 dev->flags &= ~IFF_POINTOPOINT;
1043
db2ec95d
TH		 1044 t->tun_hlen = gre_calc_hlen(t->parms.o_flags);
1045
1faf3d9f 1046 t->hlen = t->encap_hlen + t->tun_hlen;
db2ec95d
TH		 1047
1048 t_hlen = t->hlen + sizeof(struct ipv6hdr);
c12b395a 1049
1050 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1051 int strict = (ipv6_addr_type(&p->raddr) &
1052 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1053
22f08069 1054 struct rt6_info *rt = rt6_lookup(t->net,
c12b395a 1055 &p->raddr, &p->laddr,
b75cc8f9 1056 p->link, NULL, strict);
c12b395a 1057
63159f29 1058 if (!rt)
c12b395a 1059 return;
1060
1061 if (rt->dst.dev) {
db2ec95d
TH		 1062 dev->hard_header_len = rt->dst.dev->hard_header_len +
1063 t_hlen;
c12b395a 1064
1065 if (set_mtu) {
db2ec95d 1066 dev->mtu = rt->dst.dev->mtu - t_hlen;
c12b395a 1067 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1068 dev->mtu -= 8;
a9e242ca
AD		 1069 if (dev->type == ARPHRD_ETHER)
1070 dev->mtu -= ETH_HLEN;
c12b395a 1071
1072 if (dev->mtu < IPV6_MIN_MTU)
1073 dev->mtu = IPV6_MIN_MTU;
1074 }
1075 }
94e187c0 1076 ip6_rt_put(rt);
c12b395a 1077 }
c12b395a 1078}
1079
1080static int ip6gre_tnl_change(struct ip6_tnl *t,
1081 const struct __ip6_tnl_parm *p, int set_mtu)
1082{
1083 t->parms.laddr = p->laddr;
1084 t->parms.raddr = p->raddr;
1085 t->parms.flags = p->flags;
1086 t->parms.hop_limit = p->hop_limit;
1087 t->parms.encap_limit = p->encap_limit;
1088 t->parms.flowinfo = p->flowinfo;
1089 t->parms.link = p->link;
1090 t->parms.proto = p->proto;
1091 t->parms.i_key = p->i_key;
1092 t->parms.o_key = p->o_key;
1093 t->parms.i_flags = p->i_flags;
1094 t->parms.o_flags = p->o_flags;
0a473b82 1095 t->parms.fwmark = p->fwmark;
607f725f 1096 dst_cache_reset(&t->dst_cache);
c12b395a 1097 ip6gre_tnl_link_config(t, set_mtu);
1098 return 0;
1099}
1100
1101static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1102 const struct ip6_tnl_parm2 *u)
1103{
1104 p->laddr = u->laddr;
1105 p->raddr = u->raddr;
1106 p->flags = u->flags;
1107 p->hop_limit = u->hop_limit;
1108 p->encap_limit = u->encap_limit;
1109 p->flowinfo = u->flowinfo;
1110 p->link = u->link;
1111 p->i_key = u->i_key;
1112 p->o_key = u->o_key;
f41fe3c2
TH		 1113 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1114 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
c12b395a 1115 memcpy(p->name, u->name, sizeof(u->name));
1116}
1117
1118static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1119 const struct __ip6_tnl_parm *p)
1120{
1121 u->proto = IPPROTO_GRE;
1122 u->laddr = p->laddr;
1123 u->raddr = p->raddr;
1124 u->flags = p->flags;
1125 u->hop_limit = p->hop_limit;
1126 u->encap_limit = p->encap_limit;
1127 u->flowinfo = p->flowinfo;
1128 u->link = p->link;
1129 u->i_key = p->i_key;
1130 u->o_key = p->o_key;
f41fe3c2
TH		 1131 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1132 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
c12b395a 1133 memcpy(u->name, p->name, sizeof(u->name));
1134}
1135
1136static int ip6gre_tunnel_ioctl(struct net_device *dev,
1137 struct ifreq *ifr, int cmd)
1138{
1139 int err = 0;
1140 struct ip6_tnl_parm2 p;
1141 struct __ip6_tnl_parm p1;
22f08069
ND		 1142 struct ip6_tnl *t = netdev_priv(dev);
1143 struct net *net = t->net;
c12b395a 1144 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1145
308edfdf
TH		 1146 memset(&p1, 0, sizeof(p1));
1147
c12b395a 1148 switch (cmd) {
1149 case SIOCGETTUNNEL:
c12b395a 1150 if (dev == ign->fb_tunnel_dev) {
1151 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1152 err = -EFAULT;
1153 break;
1154 }
1155 ip6gre_tnl_parm_from_user(&p1, &p);
1156 t = ip6gre_tunnel_locate(net, &p1, 0);
63159f29 1157 if (!t)
22f08069 1158 t = netdev_priv(dev);
c12b395a 1159 }
5dbd5068 1160 memset(&p, 0, sizeof(p));
c12b395a 1161 ip6gre_tnl_parm_to_user(&p, &t->parms);
1162 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1163 err = -EFAULT;
1164 break;
1165
1166 case SIOCADDTUNNEL:
1167 case SIOCCHGTUNNEL:
1168 err = -EPERM;
af31f412 1169 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
c12b395a 1170 goto done;
1171
1172 err = -EFAULT;
1173 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1174 goto done;
1175
1176 err = -EINVAL;
1177 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1178 goto done;
1179
1180 if (!(p.i_flags&GRE_KEY))
1181 p.i_key = 0;
1182 if (!(p.o_flags&GRE_KEY))
1183 p.o_key = 0;
1184
1185 ip6gre_tnl_parm_from_user(&p1, &p);
1186 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1187
1188 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
53b24b8f 1189 if (t) {
c12b395a 1190 if (t->dev != dev) {
1191 err = -EEXIST;
1192 break;
1193 }
1194 } else {
1195 t = netdev_priv(dev);
1196
1197 ip6gre_tunnel_unlink(ign, t);
1198 synchronize_net();
1199 ip6gre_tnl_change(t, &p1, 1);
1200 ip6gre_tunnel_link(ign, t);
1201 netdev_state_change(dev);
1202 }
1203 }
1204
1205 if (t) {
1206 err = 0;
1207
5dbd5068 1208 memset(&p, 0, sizeof(p));
c12b395a 1209 ip6gre_tnl_parm_to_user(&p, &t->parms);
1210 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1211 err = -EFAULT;
1212 } else
1213 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1214 break;
1215
1216 case SIOCDELTUNNEL:
1217 err = -EPERM;
af31f412 1218 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
c12b395a 1219 goto done;
1220
1221 if (dev == ign->fb_tunnel_dev) {
1222 err = -EFAULT;
1223 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1224 goto done;
1225 err = -ENOENT;
1226 ip6gre_tnl_parm_from_user(&p1, &p);
1227 t = ip6gre_tunnel_locate(net, &p1, 0);
63159f29 1228 if (!t)
c12b395a 1229 goto done;
1230 err = -EPERM;
1231 if (t == netdev_priv(ign->fb_tunnel_dev))
1232 goto done;
1233 dev = t->dev;
1234 }
1235 unregister_netdevice(dev);
1236 err = 0;
1237 break;
1238
1239 default:
1240 err = -EINVAL;
1241 }
1242
1243done:
1244 return err;
1245}
1246
c12b395a 1247static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
76cc0d32
XL		 1248 unsigned short type, const void *daddr,
1249 const void *saddr, unsigned int len)
c12b395a 1250{
1251 struct ip6_tnl *t = netdev_priv(dev);
76cc0d32
XL		 1252 struct ipv6hdr *ipv6h;
1253 __be16 *p;
c12b395a 1254
76cc0d32
XL		 1255 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1256 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1257 t->fl.u.ip6.flowlabel,
1258 true, &t->fl.u.ip6));
c12b395a 1259 ipv6h->hop_limit = t->parms.hop_limit;
1260 ipv6h->nexthdr = NEXTHDR_GRE;
1261 ipv6h->saddr = t->parms.laddr;
1262 ipv6h->daddr = t->parms.raddr;
1263
76cc0d32
XL		 1264 p = (__be16 *)(ipv6h + 1);
1265 p[0] = t->parms.o_flags;
1266 p[1] = htons(type);
c12b395a 1267
1268 /*
1269 * Set the source hardware address.
1270 */
1271
1272 if (saddr)
1273 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1274 if (daddr)
1275 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1276 if (!ipv6_addr_any(&ipv6h->daddr))
1277 return t->hlen;
1278
1279 return -t->hlen;
1280}
1281
c12b395a 1282static const struct header_ops ip6gre_header_ops = {
1283 .create = ip6gre_header,
c12b395a 1284};
1285
1286static const struct net_device_ops ip6gre_netdev_ops = {
1287 .ndo_init = ip6gre_tunnel_init,
1288 .ndo_uninit = ip6gre_tunnel_uninit,
1289 .ndo_start_xmit = ip6gre_tunnel_xmit,
1290 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
b05229f4 1291 .ndo_change_mtu = ip6_tnl_change_mtu,
f61dd388 1292 .ndo_get_stats64 = ip_tunnel_get_stats64,
ecf2c06a 1293 .ndo_get_iflink = ip6_tnl_get_iflink,
c12b395a 1294};
1295
1296static void ip6gre_dev_free(struct net_device *dev)
1297{
cdf3464e
MKL		 1298 struct ip6_tnl *t = netdev_priv(dev);
1299
607f725f 1300 dst_cache_destroy(&t->dst_cache);
c12b395a 1301 free_percpu(dev->tstats);
c12b395a 1302}
1303
1304static void ip6gre_tunnel_setup(struct net_device *dev)
1305{
c12b395a 1306 dev->netdev_ops = &ip6gre_netdev_ops;
cf124db5
DM		 1307 dev->needs_free_netdev = true;
1308 dev->priv_destructor = ip6gre_dev_free;
c12b395a 1309
1310 dev->type = ARPHRD_IP6GRE;
b05229f4 1311
c12b395a 1312 dev->flags |= IFF_NOARP;
c12b395a 1313 dev->addr_len = sizeof(struct in6_addr);
02875878 1314 netif_keep_dst(dev);
45ce0fd1
FJ		 1315 /* This perm addr will be used as interface identifier by IPv6 */
1316 dev->addr_assign_type = NET_ADDR_RANDOM;
1317 eth_random_addr(dev->perm_addr);
c12b395a 1318}
1319
e5a9336a
AK		 1320#define GRE6_FEATURES (NETIF_F_SG | \
1321 NETIF_F_FRAGLIST | \
1322 NETIF_F_HIGHDMA | \
1323 NETIF_F_HW_CSUM)
1324
1325static void ip6gre_tnl_init_features(struct net_device *dev)
1326{
1327 struct ip6_tnl *nt = netdev_priv(dev);
1328
1329 dev->features |= GRE6_FEATURES;
1330 dev->hw_features |= GRE6_FEATURES;
1331
1332 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1333 /* TCP offload with GRE SEQ is not supported, nor
1334 * can we support 2 levels of outer headers requiring
1335 * an update.
1336 */
1337 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1338 nt->encap.type == TUNNEL_ENCAP_NONE) {
1339 dev->features |= NETIF_F_GSO_SOFTWARE;
1340 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1341 }
1342
1343 /* Can use a lockless transmit, unless we generate
1344 * output sequences
1345 */
1346 dev->features |= NETIF_F_LLTX;
1347 }
1348}
1349
a3c119d3 1350static int ip6gre_tunnel_init_common(struct net_device *dev)
c12b395a 1351{
1352 struct ip6_tnl *tunnel;
cdf3464e 1353 int ret;
b05229f4 1354 int t_hlen;
c12b395a 1355
1356 tunnel = netdev_priv(dev);
1357
1358 tunnel->dev = dev;
0bd87628 1359 tunnel->net = dev_net(dev);
c12b395a 1360 strcpy(tunnel->parms.name, dev->name);
1361
a3c119d3
MKL		 1362 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1363 if (!dev->tstats)
1364 return -ENOMEM;
1365
607f725f 1366 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
cdf3464e
MKL		 1367 if (ret) {
1368 free_percpu(dev->tstats);
1369 dev->tstats = NULL;
1370 return ret;
1371 }
1372
b05229f4 1373 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1faf3d9f 1374 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
db2ec95d 1375 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
b05229f4 1376
db2ec95d
TH		 1377 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1378 dev->mtu = ETH_DATA_LEN - t_hlen;
1b227e53
HY		 1379 if (dev->type == ARPHRD_ETHER)
1380 dev->mtu -= ETH_HLEN;
b05229f4
TH		 1381 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1382 dev->mtu -= 8;
1383
6712abc1
WT		 1384 if (tunnel->parms.collect_md) {
1385 dev->features |= NETIF_F_NETNS_LOCAL;
1386 netif_keep_dst(dev);
1387 }
e5a9336a 1388 ip6gre_tnl_init_features(dev);
6712abc1 1389
a3c119d3
MKL		 1390 return 0;
1391}
1392
1393static int ip6gre_tunnel_init(struct net_device *dev)
1394{
1395 struct ip6_tnl *tunnel;
1396 int ret;
1397
1398 ret = ip6gre_tunnel_init_common(dev);
1399 if (ret)
1400 return ret;
1401
1402 tunnel = netdev_priv(dev);
1403
6712abc1
WT		 1404 if (tunnel->parms.collect_md)
1405 return 0;
1406
c12b395a 1407 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1408 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1409
1410 if (ipv6_addr_any(&tunnel->parms.raddr))
1411 dev->header_ops = &ip6gre_header_ops;
1412
c12b395a 1413 return 0;
1414}
1415
1416static void ip6gre_fb_tunnel_init(struct net_device *dev)
1417{
1418 struct ip6_tnl *tunnel = netdev_priv(dev);
1419
1420 tunnel->dev = dev;
0bd87628 1421 tunnel->net = dev_net(dev);
c12b395a 1422 strcpy(tunnel->parms.name, dev->name);
1423
1424 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1425
1426 dev_hold(dev);
1427}
1428
c12b395a 1429static struct inet6_protocol ip6gre_protocol __read_mostly = {
308edfdf 1430 .handler = gre_rcv,
c12b395a 1431 .err_handler = ip6gre_err,
1432 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1433};
1434
22f08069 1435static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
c12b395a 1436{
22f08069
ND		 1437 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1438 struct net_device *dev, *aux;
c12b395a 1439 int prio;
1440
22f08069
ND		 1441 for_each_netdev_safe(net, dev, aux)
1442 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
5a963eb6
WT		 1443 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1444 dev->rtnl_link_ops == &ip6erspan_tap_ops)
22f08069
ND		 1445 unregister_netdevice_queue(dev, head);
1446
c12b395a 1447 for (prio = 0; prio < 4; prio++) {
1448 int h;
e87a8f24 1449 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
c12b395a 1450 struct ip6_tnl *t;
1451
1452 t = rtnl_dereference(ign->tunnels[prio][h]);
1453
53b24b8f 1454 while (t) {
22f08069
ND		 1455 /* If dev is in the same netns, it has already
1456 * been added to the list by the previous loop.
1457 */
1458 if (!net_eq(dev_net(t->dev), net))
1459 unregister_netdevice_queue(t->dev,
1460 head);
c12b395a 1461 t = rtnl_dereference(t->next);
1462 }
1463 }
1464 }
1465}
1466
1467static int __net_init ip6gre_init_net(struct net *net)
1468{
1469 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1470 int err;
1471
1472 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
c835a677
TG		 1473 NET_NAME_UNKNOWN,
1474 ip6gre_tunnel_setup);
c12b395a 1475 if (!ign->fb_tunnel_dev) {
1476 err = -ENOMEM;
1477 goto err_alloc_dev;
1478 }
1479 dev_net_set(ign->fb_tunnel_dev, net);
22f08069
ND		 1480 /* FB netdevice is special: we have one, and only one per netns.
1481 * Allowing to move it to another netns is clearly unsafe.
1482 */
1483 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1484
c12b395a 1485
1486 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1487 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1488
1489 err = register_netdev(ign->fb_tunnel_dev);
1490 if (err)
1491 goto err_reg_dev;
1492
1493 rcu_assign_pointer(ign->tunnels_wc[0],
1494 netdev_priv(ign->fb_tunnel_dev));
1495 return 0;
1496
1497err_reg_dev:
cf124db5 1498 free_netdev(ign->fb_tunnel_dev);
c12b395a 1499err_alloc_dev:
1500 return err;
1501}
1502
bb401cae 1503static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
c12b395a 1504{
bb401cae 1505 struct net *net;
c12b395a 1506 LIST_HEAD(list);
1507
c12b395a 1508 rtnl_lock();
bb401cae
ED		 1509 list_for_each_entry(net, net_list, exit_list)
1510 ip6gre_destroy_tunnels(net, &list);
c12b395a 1511 unregister_netdevice_many(&list);
1512 rtnl_unlock();
1513}
1514
1515static struct pernet_operations ip6gre_net_ops = {
1516 .init = ip6gre_init_net,
bb401cae 1517 .exit_batch = ip6gre_exit_batch_net,
c12b395a 1518 .id = &ip6gre_net_id,
1519 .size = sizeof(struct ip6gre_net),
5c155c50 1520 .async = true,
c12b395a 1521};
1522
a8b8a889
MS		 1523static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1524 struct netlink_ext_ack *extack)
c12b395a 1525{
1526 __be16 flags;
1527
1528 if (!data)
1529 return 0;
1530
1531 flags = 0;
1532 if (data[IFLA_GRE_IFLAGS])
1533 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1534 if (data[IFLA_GRE_OFLAGS])
1535 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1536 if (flags & (GRE_VERSION|GRE_ROUTING))
1537 return -EINVAL;
1538
1539 return 0;
1540}
1541
a8b8a889
MS		 1542static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1543 struct netlink_ext_ack *extack)
c12b395a 1544{
1545 struct in6_addr daddr;
1546
1547 if (tb[IFLA_ADDRESS]) {
1548 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1549 return -EINVAL;
1550 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1551 return -EADDRNOTAVAIL;
1552 }
1553
1554 if (!data)
1555 goto out;
1556
1557 if (data[IFLA_GRE_REMOTE]) {
67b61f6c 1558 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
c12b395a 1559 if (ipv6_addr_any(&daddr))
1560 return -EINVAL;
1561 }
1562
1563out:
a8b8a889 1564 return ip6gre_tunnel_validate(tb, data, extack);
c12b395a 1565}
1566
5a963eb6
WT		 1567static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1568 struct netlink_ext_ack *extack)
1569{
1570 __be16 flags = 0;
94d7d8f2 1571 int ret, ver = 0;
5a963eb6
WT		 1572
1573 if (!data)
1574 return 0;
1575
1576 ret = ip6gre_tap_validate(tb, data, extack);
1577 if (ret)
1578 return ret;
1579
1580 /* ERSPAN should only have GRE sequence and key flag */
1581 if (data[IFLA_GRE_OFLAGS])
1582 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1583 if (data[IFLA_GRE_IFLAGS])
1584 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1585 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1586 flags != (GRE_SEQ | GRE_KEY))
1587 return -EINVAL;
1588
1589 /* ERSPAN Session ID only has 10-bit. Since we reuse
1590 * 32-bit key field as ID, check it's range.
1591 */
1592 if (data[IFLA_GRE_IKEY] &&
1593 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1594 return -EINVAL;
1595
1596 if (data[IFLA_GRE_OKEY] &&
1597 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1598 return -EINVAL;
1599
94d7d8f2
WT		 1600 if (data[IFLA_GRE_ERSPAN_VER]) {
1601 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1602 if (ver != 1 && ver != 2)
5a963eb6
WT		 1603 return -EINVAL;
1604 }
94d7d8f2
WT		 1605
1606 if (ver == 1) {
1607 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1608 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1609
1610 if (index & ~INDEX_MASK)
1611 return -EINVAL;
1612 }
1613 } else if (ver == 2) {
1614 if (data[IFLA_GRE_ERSPAN_DIR]) {
1615 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1616
1617 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1618 return -EINVAL;
1619 }
1620
1621 if (data[IFLA_GRE_ERSPAN_HWID]) {
1622 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1623
1624 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1625 return -EINVAL;
1626 }
1627 }
1628
5a963eb6
WT		 1629 return 0;
1630}
c12b395a 1631
1632static void ip6gre_netlink_parms(struct nlattr *data[],
1633 struct __ip6_tnl_parm *parms)
1634{
1635 memset(parms, 0, sizeof(*parms));
1636
1637 if (!data)
1638 return;
1639
1640 if (data[IFLA_GRE_LINK])
1641 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1642
1643 if (data[IFLA_GRE_IFLAGS])
f41fe3c2
TH		 1644 parms->i_flags = gre_flags_to_tnl_flags(
1645 nla_get_be16(data[IFLA_GRE_IFLAGS]));
c12b395a 1646
1647 if (data[IFLA_GRE_OFLAGS])
f41fe3c2
TH		 1648 parms->o_flags = gre_flags_to_tnl_flags(
1649 nla_get_be16(data[IFLA_GRE_OFLAGS]));
c12b395a 1650
1651 if (data[IFLA_GRE_IKEY])
1652 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1653
1654 if (data[IFLA_GRE_OKEY])
1655 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1656
1657 if (data[IFLA_GRE_LOCAL])
67b61f6c 1658 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
c12b395a 1659
1660 if (data[IFLA_GRE_REMOTE])
67b61f6c 1661 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
c12b395a 1662
1663 if (data[IFLA_GRE_TTL])
1664 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1665
1666 if (data[IFLA_GRE_ENCAP_LIMIT])
1667 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1668
1669 if (data[IFLA_GRE_FLOWINFO])
c2675de4 1670 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
c12b395a 1671
1672 if (data[IFLA_GRE_FLAGS])
1673 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
0a473b82
CG		 1674
1675 if (data[IFLA_GRE_FWMARK])
1676 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
5a963eb6 1677
6712abc1
WT		 1678 if (data[IFLA_GRE_COLLECT_METADATA])
1679 parms->collect_md = true;
94d7d8f2
WT		 1680
1681 if (data[IFLA_GRE_ERSPAN_VER])
1682 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1683
1684 if (parms->erspan_ver == 1) {
1685 if (data[IFLA_GRE_ERSPAN_INDEX])
1686 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1687 } else if (parms->erspan_ver == 2) {
1688 if (data[IFLA_GRE_ERSPAN_DIR])
1689 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1690 if (data[IFLA_GRE_ERSPAN_HWID])
1691 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1692 }
c12b395a 1693}
1694
1695static int ip6gre_tap_init(struct net_device *dev)
1696{
a3c119d3 1697 int ret;
c12b395a 1698
a3c119d3
MKL		 1699 ret = ip6gre_tunnel_init_common(dev);
1700 if (ret)
1701 return ret;
c12b395a 1702
0a46baaf
SC		 1703 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1704
c12b395a 1705 return 0;
1706}
1707
1708static const struct net_device_ops ip6gre_tap_netdev_ops = {
1709 .ndo_init = ip6gre_tap_init,
1710 .ndo_uninit = ip6gre_tunnel_uninit,
1711 .ndo_start_xmit = ip6gre_tunnel_xmit,
1712 .ndo_set_mac_address = eth_mac_addr,
1713 .ndo_validate_addr = eth_validate_addr,
b05229f4 1714 .ndo_change_mtu = ip6_tnl_change_mtu,
f61dd388 1715 .ndo_get_stats64 = ip_tunnel_get_stats64,
ecf2c06a 1716 .ndo_get_iflink = ip6_tnl_get_iflink,
c12b395a 1717};
1718
5a963eb6
WT		 1719static int ip6erspan_tap_init(struct net_device *dev)
1720{
1721 struct ip6_tnl *tunnel;
1722 int t_hlen;
1723 int ret;
1724
1725 tunnel = netdev_priv(dev);
1726
1727 tunnel->dev = dev;
1728 tunnel->net = dev_net(dev);
1729 strcpy(tunnel->parms.name, dev->name);
1730
1731 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1732 if (!dev->tstats)
1733 return -ENOMEM;
1734
1735 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1736 if (ret) {
1737 free_percpu(dev->tstats);
1738 dev->tstats = NULL;
1739 return ret;
1740 }
1741
1742 tunnel->tun_hlen = 8;
1743 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
94d7d8f2 1744 erspan_hdr_len(tunnel->parms.erspan_ver);
5a963eb6
WT		 1745 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1746
1747 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1748 dev->mtu = ETH_DATA_LEN - t_hlen;
1749 if (dev->type == ARPHRD_ETHER)
1750 dev->mtu -= ETH_HLEN;
1751 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1752 dev->mtu -= 8;
1753
1754 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1755 tunnel = netdev_priv(dev);
1756 ip6gre_tnl_link_config(tunnel, 1);
1757
1758 return 0;
1759}
1760
1761static const struct net_device_ops ip6erspan_netdev_ops = {
1762 .ndo_init = ip6erspan_tap_init,
1763 .ndo_uninit = ip6gre_tunnel_uninit,
1764 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1765 .ndo_set_mac_address = eth_mac_addr,
1766 .ndo_validate_addr = eth_validate_addr,
1767 .ndo_change_mtu = ip6_tnl_change_mtu,
1768 .ndo_get_stats64 = ip_tunnel_get_stats64,
1769 .ndo_get_iflink = ip6_tnl_get_iflink,
1770};
1771
c12b395a 1772static void ip6gre_tap_setup(struct net_device *dev)
1773{
1774
1775 ether_setup(dev);
1776
2c52129a 1777 dev->max_mtu = 0;
c12b395a 1778 dev->netdev_ops = &ip6gre_tap_netdev_ops;
cf124db5
DM		 1779 dev->needs_free_netdev = true;
1780 dev->priv_destructor = ip6gre_dev_free;
c12b395a 1781
c12b395a 1782 dev->features |= NETIF_F_NETNS_LOCAL;
d13b161c 1783 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
0a46baaf 1784 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2d40557c 1785 netif_keep_dst(dev);
c12b395a 1786}
1787
d1b2a6c4
PM		 1788bool is_ip6gretap_dev(const struct net_device *dev)
1789{
1790 return dev->netdev_ops == &ip6gre_tap_netdev_ops;
1791}
1792EXPORT_SYMBOL_GPL(is_ip6gretap_dev);
1793
1faf3d9f
TH		 1794static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1795 struct ip_tunnel_encap *ipencap)
1796{
1797 bool ret = false;
1798
1799 memset(ipencap, 0, sizeof(*ipencap));
1800
1801 if (!data)
1802 return ret;
1803
1804 if (data[IFLA_GRE_ENCAP_TYPE]) {
1805 ret = true;
1806 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1807 }
1808
1809 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1810 ret = true;
1811 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1812 }
1813
1814 if (data[IFLA_GRE_ENCAP_SPORT]) {
1815 ret = true;
1816 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1817 }
1818
1819 if (data[IFLA_GRE_ENCAP_DPORT]) {
1820 ret = true;
1821 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1822 }
1823
1824 return ret;
1825}
1826
c12b395a 1827static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
7a3f4a18
MS		 1828 struct nlattr *tb[], struct nlattr *data[],
1829 struct netlink_ext_ack *extack)
c12b395a 1830{
1831 struct ip6_tnl *nt;
1832 struct net *net = dev_net(dev);
1833 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1faf3d9f 1834 struct ip_tunnel_encap ipencap;
c12b395a 1835 int err;
1836
1837 nt = netdev_priv(dev);
1faf3d9f
TH		 1838
1839 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1840 int err = ip6_tnl_encap_setup(nt, &ipencap);
1841
1842 if (err < 0)
1843 return err;
1844 }
1845
c12b395a 1846 ip6gre_netlink_parms(data, &nt->parms);
1847
6712abc1
WT		 1848 if (nt->parms.collect_md) {
1849 if (rtnl_dereference(ign->collect_md_tun))
1850 return -EEXIST;
1851 } else {
1852 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1853 return -EEXIST;
1854 }
c12b395a 1855
1856 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1857 eth_hw_addr_random(dev);
1858
1859 nt->dev = dev;
0bd87628 1860 nt->net = dev_net(dev);
c12b395a 1861
c12b395a 1862 err = register_netdevice(dev);
1863 if (err)
1864 goto out;
1865
128bb975
AK		 1866 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1867
1868 if (tb[IFLA_MTU])
1869 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1870
c12b395a 1871 dev_hold(dev);
1872 ip6gre_tunnel_link(ign, nt);
1873
1874out:
1875 return err;
1876}
1877
1878static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
ad744b22
MS		 1879 struct nlattr *data[],
1880 struct netlink_ext_ack *extack)
c12b395a 1881{
22f08069
ND		 1882 struct ip6_tnl *t, *nt = netdev_priv(dev);
1883 struct net *net = nt->net;
c12b395a 1884 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1885 struct __ip6_tnl_parm p;
1faf3d9f 1886 struct ip_tunnel_encap ipencap;
c12b395a 1887
1888 if (dev == ign->fb_tunnel_dev)
1889 return -EINVAL;
1890
1faf3d9f
TH		 1891 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1892 int err = ip6_tnl_encap_setup(nt, &ipencap);
1893
1894 if (err < 0)
1895 return err;
1896 }
1897
c12b395a 1898 ip6gre_netlink_parms(data, &p);
1899
1900 t = ip6gre_tunnel_locate(net, &p, 0);
1901
1902 if (t) {
1903 if (t->dev != dev)
1904 return -EEXIST;
1905 } else {
1906 t = nt;
c12b395a 1907 }
1908
6a61d4db
ND		 1909 ip6gre_tunnel_unlink(ign, t);
1910 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1911 ip6gre_tunnel_link(ign, t);
c12b395a 1912 return 0;
1913}
1914
54d63f78
ND		 1915static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
1916{
1917 struct net *net = dev_net(dev);
1918 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1919
1920 if (dev != ign->fb_tunnel_dev)
1921 unregister_netdevice_queue(dev, head);
1922}
1923
c12b395a 1924static size_t ip6gre_get_size(const struct net_device *dev)
1925{
1926 return
1927 /* IFLA_GRE_LINK */
1928 nla_total_size(4) +
1929 /* IFLA_GRE_IFLAGS */
1930 nla_total_size(2) +
1931 /* IFLA_GRE_OFLAGS */
1932 nla_total_size(2) +
1933 /* IFLA_GRE_IKEY */
1934 nla_total_size(4) +
1935 /* IFLA_GRE_OKEY */
1936 nla_total_size(4) +
1937 /* IFLA_GRE_LOCAL */
a3754133 1938 nla_total_size(sizeof(struct in6_addr)) +
c12b395a 1939 /* IFLA_GRE_REMOTE */
a3754133 1940 nla_total_size(sizeof(struct in6_addr)) +
c12b395a 1941 /* IFLA_GRE_TTL */
1942 nla_total_size(1) +
c12b395a 1943 /* IFLA_GRE_ENCAP_LIMIT */
1944 nla_total_size(1) +
1945 /* IFLA_GRE_FLOWINFO */
1946 nla_total_size(4) +
1947 /* IFLA_GRE_FLAGS */
1948 nla_total_size(4) +
1faf3d9f
TH		 1949 /* IFLA_GRE_ENCAP_TYPE */
1950 nla_total_size(2) +
1951 /* IFLA_GRE_ENCAP_FLAGS */
1952 nla_total_size(2) +
1953 /* IFLA_GRE_ENCAP_SPORT */
1954 nla_total_size(2) +
1955 /* IFLA_GRE_ENCAP_DPORT */
1956 nla_total_size(2) +
6712abc1
WT		 1957 /* IFLA_GRE_COLLECT_METADATA */
1958 nla_total_size(0) +
0a473b82
CG		 1959 /* IFLA_GRE_FWMARK */
1960 nla_total_size(4) +
5a963eb6
WT		 1961 /* IFLA_GRE_ERSPAN_INDEX */
1962 nla_total_size(4) +
c12b395a 1963 0;
1964}
1965
1966static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1967{
1968 struct ip6_tnl *t = netdev_priv(dev);
1969 struct __ip6_tnl_parm *p = &t->parms;
1970
1971 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
f41fe3c2
TH		 1972 nla_put_be16(skb, IFLA_GRE_IFLAGS,
1973 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
1974 nla_put_be16(skb, IFLA_GRE_OFLAGS,
1975 gre_tnl_flags_to_gre_flags(p->o_flags)) ||
c12b395a 1976 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1977 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
930345ea
JB		 1978 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
1979 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
c12b395a 1980 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
c12b395a 1981 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1982 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
0a473b82 1983 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
5a963eb6
WT		 1984 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark) ||
1985 nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
c12b395a 1986 goto nla_put_failure;
1faf3d9f
TH		 1987
1988 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
1989 t->encap.type) ||
1990 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
1991 t->encap.sport) ||
1992 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
1993 t->encap.dport) ||
1994 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
1995 t->encap.flags))
1996 goto nla_put_failure;
1997
6712abc1
WT		 1998 if (p->collect_md) {
1999 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2000 goto nla_put_failure;
2001 }
2002
94d7d8f2
WT		 2003 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2004 goto nla_put_failure;
2005
2006 if (p->erspan_ver == 1) {
2007 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2008 goto nla_put_failure;
2009 } else if (p->erspan_ver == 2) {
2010 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2011 goto nla_put_failure;
2012 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2013 goto nla_put_failure;
2014 }
2015
c12b395a 2016 return 0;
2017
2018nla_put_failure:
2019 return -EMSGSIZE;
2020}
2021
2022static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2023 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2024 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2025 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2026 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2027 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2028 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
2029 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
2030 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2031 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2032 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2033 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1faf3d9f
TH		 2034 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2035 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2036 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2037 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
6712abc1 2038 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
0a473b82 2039 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
5a963eb6 2040 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
94d7d8f2
WT		 2041 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2042 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2043 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
c12b395a 2044};
2045
5a963eb6
WT		 2046static void ip6erspan_tap_setup(struct net_device *dev)
2047{
2048 ether_setup(dev);
2049
2050 dev->netdev_ops = &ip6erspan_netdev_ops;
2051 dev->needs_free_netdev = true;
2052 dev->priv_destructor = ip6gre_dev_free;
2053
2054 dev->features |= NETIF_F_NETNS_LOCAL;
2055 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2056 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2057 netif_keep_dst(dev);
2058}
2059
c12b395a 2060static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2061 .kind = "ip6gre",
2062 .maxtype = IFLA_GRE_MAX,
2063 .policy = ip6gre_policy,
2064 .priv_size = sizeof(struct ip6_tnl),
2065 .setup = ip6gre_tunnel_setup,
2066 .validate = ip6gre_tunnel_validate,
2067 .newlink = ip6gre_newlink,
2068 .changelink = ip6gre_changelink,
54d63f78 2069 .dellink = ip6gre_dellink,
c12b395a 2070 .get_size = ip6gre_get_size,
2071 .fill_info = ip6gre_fill_info,
1728d4fa 2072 .get_link_net = ip6_tnl_get_link_net,
c12b395a 2073};
2074
2075static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2076 .kind = "ip6gretap",
2077 .maxtype = IFLA_GRE_MAX,
2078 .policy = ip6gre_policy,
2079 .priv_size = sizeof(struct ip6_tnl),
2080 .setup = ip6gre_tap_setup,
2081 .validate = ip6gre_tap_validate,
2082 .newlink = ip6gre_newlink,
2083 .changelink = ip6gre_changelink,
2084 .get_size = ip6gre_get_size,
2085 .fill_info = ip6gre_fill_info,
3390e397 2086 .get_link_net = ip6_tnl_get_link_net,
c12b395a 2087};
2088
5a963eb6
WT		 2089static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2090 .kind = "ip6erspan",
2091 .maxtype = IFLA_GRE_MAX,
2092 .policy = ip6gre_policy,
2093 .priv_size = sizeof(struct ip6_tnl),
2094 .setup = ip6erspan_tap_setup,
2095 .validate = ip6erspan_tap_validate,
2096 .newlink = ip6gre_newlink,
2097 .changelink = ip6gre_changelink,
2098 .get_size = ip6gre_get_size,
2099 .fill_info = ip6gre_fill_info,
2100 .get_link_net = ip6_tnl_get_link_net,
2101};
2102
c12b395a 2103/*
2104 * And now the modules code and kernel interface.
2105 */
2106
2107static int __init ip6gre_init(void)
2108{
2109 int err;
2110
2111 pr_info("GRE over IPv6 tunneling driver\n");
2112
2113 err = register_pernet_device(&ip6gre_net_ops);
2114 if (err < 0)
2115 return err;
2116
2117 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2118 if (err < 0) {
2119 pr_info("%s: can't add protocol\n", __func__);
2120 goto add_proto_failed;
2121 }
2122
2123 err = rtnl_link_register(&ip6gre_link_ops);
2124 if (err < 0)
2125 goto rtnl_link_failed;
2126
2127 err = rtnl_link_register(&ip6gre_tap_ops);
2128 if (err < 0)
2129 goto tap_ops_failed;
2130
5a963eb6
WT		 2131 err = rtnl_link_register(&ip6erspan_tap_ops);
2132 if (err < 0)
2133 goto erspan_link_failed;
2134
c12b395a 2135out:
2136 return err;
2137
5a963eb6
WT		 2138erspan_link_failed:
2139 rtnl_link_unregister(&ip6gre_tap_ops);
c12b395a 2140tap_ops_failed:
2141 rtnl_link_unregister(&ip6gre_link_ops);
2142rtnl_link_failed:
2143 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2144add_proto_failed:
2145 unregister_pernet_device(&ip6gre_net_ops);
2146 goto out;
2147}
2148
2149static void __exit ip6gre_fini(void)
2150{
2151 rtnl_link_unregister(&ip6gre_tap_ops);
2152 rtnl_link_unregister(&ip6gre_link_ops);
5a963eb6 2153 rtnl_link_unregister(&ip6erspan_tap_ops);
c12b395a 2154 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2155 unregister_pernet_device(&ip6gre_net_ops);
2156}
2157
2158module_init(ip6gre_init);
2159module_exit(ip6gre_fini);
2160MODULE_LICENSE("GPL");
2161MODULE_AUTHOR("D. Kozlov ([email protected])");
2162MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2163MODULE_ALIAS_RTNL_LINK("ip6gre");
5a4ee9a9 2164MODULE_ALIAS_RTNL_LINK("ip6gretap");
94d7d8f2 2165MODULE_ALIAS_RTNL_LINK("ip6erspan");
c12b395a 2166MODULE_ALIAS_NETDEV("ip6gre0");
Empty description
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