blob: 365b2b6f3942cdcdb8794bed6dcfa2e4477466b9 [file] [log] [blame]
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001/*
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>
27#include <linux/mroute.h>
28#include <linux/init.h>
29#include <linux/in6.h>
30#include <linux/inetdevice.h>
31#include <linux/igmp.h>
32#include <linux/netfilter_ipv4.h>
33#include <linux/etherdevice.h>
34#include <linux/if_ether.h>
35#include <linux/hash.h>
36#include <linux/if_tunnel.h>
37#include <linux/ip6_tunnel.h>
38
39#include <net/sock.h>
40#include <net/ip.h>
Pravin B Shelarc5441932013-03-25 14:49:35 +000041#include <net/ip_tunnels.h>
xeb@mail.ruc12b3952012-08-10 00:51:50 +000042#include <net/icmp.h>
43#include <net/protocol.h>
44#include <net/addrconf.h>
45#include <net/arp.h>
46#include <net/checksum.h>
47#include <net/dsfield.h>
48#include <net/inet_ecn.h>
49#include <net/xfrm.h>
50#include <net/net_namespace.h>
51#include <net/netns/generic.h>
52#include <net/rtnetlink.h>
53
54#include <net/ipv6.h>
55#include <net/ip6_fib.h>
56#include <net/ip6_route.h>
57#include <net/ip6_tunnel.h>
58
59
stephen hemmingereccc1bb2012-09-25 11:02:48 +000060static bool log_ecn_error = true;
61module_param(log_ecn_error, bool, 0644);
62MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
63
xeb@mail.ruc12b3952012-08-10 00:51:50 +000064#define HASH_SIZE_SHIFT 5
65#define HASH_SIZE (1 << HASH_SIZE_SHIFT)
66
67static int ip6gre_net_id __read_mostly;
68struct ip6gre_net {
69 struct ip6_tnl __rcu *tunnels[4][HASH_SIZE];
70
71 struct net_device *fb_tunnel_dev;
72};
73
74static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
Nicolas Dichtel22f08062014-04-22 10:15:24 +020075static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
xeb@mail.ruc12b3952012-08-10 00:51:50 +000076static int ip6gre_tunnel_init(struct net_device *dev);
77static void ip6gre_tunnel_setup(struct net_device *dev);
78static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
79static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
80
81/* Tunnel hash table */
82
83/*
84 4 hash tables:
85
86 3: (remote,local)
87 2: (remote,*)
88 1: (*,local)
89 0: (*,*)
90
91 We require exact key match i.e. if a key is present in packet
92 it will match only tunnel with the same key; if it is not present,
93 it will match only keyless tunnel.
94
95 All keysless packets, if not matched configured keyless tunnels
96 will match fallback tunnel.
97 */
98
99#define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(HASH_SIZE - 1))
100static u32 HASH_ADDR(const struct in6_addr *addr)
101{
102 u32 hash = ipv6_addr_hash(addr);
103
104 return hash_32(hash, HASH_SIZE_SHIFT);
105}
106
107#define tunnels_r_l tunnels[3]
108#define tunnels_r tunnels[2]
109#define tunnels_l tunnels[1]
110#define tunnels_wc tunnels[0]
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000111
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000112/* Given src, dst and key, find appropriate for input tunnel. */
113
114static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
115 const struct in6_addr *remote, const struct in6_addr *local,
116 __be32 key, __be16 gre_proto)
117{
118 struct net *net = dev_net(dev);
119 int link = dev->ifindex;
120 unsigned int h0 = HASH_ADDR(remote);
121 unsigned int h1 = HASH_KEY(key);
122 struct ip6_tnl *t, *cand = NULL;
123 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
124 int dev_type = (gre_proto == htons(ETH_P_TEB)) ?
125 ARPHRD_ETHER : ARPHRD_IP6GRE;
126 int score, cand_score = 4;
127
Amerigo Wange086cad2012-11-11 21:52:34 +0000128 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000129 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
130 !ipv6_addr_equal(remote, &t->parms.raddr) ||
131 key != t->parms.i_key ||
132 !(t->dev->flags & IFF_UP))
133 continue;
134
135 if (t->dev->type != ARPHRD_IP6GRE &&
136 t->dev->type != dev_type)
137 continue;
138
139 score = 0;
140 if (t->parms.link != link)
141 score |= 1;
142 if (t->dev->type != dev_type)
143 score |= 2;
144 if (score == 0)
145 return t;
146
147 if (score < cand_score) {
148 cand = t;
149 cand_score = score;
150 }
151 }
152
Amerigo Wange086cad2012-11-11 21:52:34 +0000153 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000154 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
155 key != t->parms.i_key ||
156 !(t->dev->flags & IFF_UP))
157 continue;
158
159 if (t->dev->type != ARPHRD_IP6GRE &&
160 t->dev->type != dev_type)
161 continue;
162
163 score = 0;
164 if (t->parms.link != link)
165 score |= 1;
166 if (t->dev->type != dev_type)
167 score |= 2;
168 if (score == 0)
169 return t;
170
171 if (score < cand_score) {
172 cand = t;
173 cand_score = score;
174 }
175 }
176
Amerigo Wange086cad2012-11-11 21:52:34 +0000177 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000178 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
179 (!ipv6_addr_equal(local, &t->parms.raddr) ||
180 !ipv6_addr_is_multicast(local))) ||
181 key != t->parms.i_key ||
182 !(t->dev->flags & IFF_UP))
183 continue;
184
185 if (t->dev->type != ARPHRD_IP6GRE &&
186 t->dev->type != dev_type)
187 continue;
188
189 score = 0;
190 if (t->parms.link != link)
191 score |= 1;
192 if (t->dev->type != dev_type)
193 score |= 2;
194 if (score == 0)
195 return t;
196
197 if (score < cand_score) {
198 cand = t;
199 cand_score = score;
200 }
201 }
202
Amerigo Wange086cad2012-11-11 21:52:34 +0000203 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000204 if (t->parms.i_key != key ||
205 !(t->dev->flags & IFF_UP))
206 continue;
207
208 if (t->dev->type != ARPHRD_IP6GRE &&
209 t->dev->type != dev_type)
210 continue;
211
212 score = 0;
213 if (t->parms.link != link)
214 score |= 1;
215 if (t->dev->type != dev_type)
216 score |= 2;
217 if (score == 0)
218 return t;
219
220 if (score < cand_score) {
221 cand = t;
222 cand_score = score;
223 }
224 }
225
226 if (cand != NULL)
227 return cand;
228
229 dev = ign->fb_tunnel_dev;
230 if (dev->flags & IFF_UP)
231 return netdev_priv(dev);
232
233 return NULL;
234}
235
236static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
237 const struct __ip6_tnl_parm *p)
238{
239 const struct in6_addr *remote = &p->raddr;
240 const struct in6_addr *local = &p->laddr;
241 unsigned int h = HASH_KEY(p->i_key);
242 int prio = 0;
243
244 if (!ipv6_addr_any(local))
245 prio |= 1;
246 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
247 prio |= 2;
248 h ^= HASH_ADDR(remote);
249 }
250
251 return &ign->tunnels[prio][h];
252}
253
254static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
255 const struct ip6_tnl *t)
256{
257 return __ip6gre_bucket(ign, &t->parms);
258}
259
260static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
261{
262 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
263
264 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
265 rcu_assign_pointer(*tp, t);
266}
267
268static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
269{
270 struct ip6_tnl __rcu **tp;
271 struct ip6_tnl *iter;
272
273 for (tp = ip6gre_bucket(ign, t);
274 (iter = rtnl_dereference(*tp)) != NULL;
275 tp = &iter->next) {
276 if (t == iter) {
277 rcu_assign_pointer(*tp, t->next);
278 break;
279 }
280 }
281}
282
283static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
284 const struct __ip6_tnl_parm *parms,
285 int type)
286{
287 const struct in6_addr *remote = &parms->raddr;
288 const struct in6_addr *local = &parms->laddr;
289 __be32 key = parms->i_key;
290 int link = parms->link;
291 struct ip6_tnl *t;
292 struct ip6_tnl __rcu **tp;
293 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
294
295 for (tp = __ip6gre_bucket(ign, parms);
296 (t = rtnl_dereference(*tp)) != NULL;
297 tp = &t->next)
298 if (ipv6_addr_equal(local, &t->parms.laddr) &&
299 ipv6_addr_equal(remote, &t->parms.raddr) &&
300 key == t->parms.i_key &&
301 link == t->parms.link &&
302 type == t->dev->type)
303 break;
304
305 return t;
306}
307
308static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
309 const struct __ip6_tnl_parm *parms, int create)
310{
311 struct ip6_tnl *t, *nt;
312 struct net_device *dev;
313 char name[IFNAMSIZ];
314 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
315
316 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
317 if (t || !create)
318 return t;
319
320 if (parms->name[0])
321 strlcpy(name, parms->name, IFNAMSIZ);
322 else
323 strcpy(name, "ip6gre%d");
324
325 dev = alloc_netdev(sizeof(*t), name, ip6gre_tunnel_setup);
326 if (!dev)
327 return NULL;
328
329 dev_net_set(dev, net);
330
331 nt = netdev_priv(dev);
332 nt->parms = *parms;
333 dev->rtnl_link_ops = &ip6gre_link_ops;
334
335 nt->dev = dev;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +0200336 nt->net = dev_net(dev);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000337 ip6gre_tnl_link_config(nt, 1);
338
339 if (register_netdevice(dev) < 0)
340 goto failed_free;
341
342 /* Can use a lockless transmit, unless we generate output sequences */
343 if (!(nt->parms.o_flags & GRE_SEQ))
344 dev->features |= NETIF_F_LLTX;
345
346 dev_hold(dev);
347 ip6gre_tunnel_link(ign, nt);
348 return nt;
349
350failed_free:
351 free_netdev(dev);
352 return NULL;
353}
354
355static void ip6gre_tunnel_uninit(struct net_device *dev)
356{
Nicolas Dichtel22f08062014-04-22 10:15:24 +0200357 struct ip6_tnl *t = netdev_priv(dev);
358 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000359
Nicolas Dichtel22f08062014-04-22 10:15:24 +0200360 ip6gre_tunnel_unlink(ign, t);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000361 dev_put(dev);
362}
363
364
365static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
366 u8 type, u8 code, int offset, __be32 info)
367{
368 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
Eric Dumazetb87fb392012-08-19 03:47:30 +0000369 __be16 *p = (__be16 *)(skb->data + offset);
370 int grehlen = offset + 4;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000371 struct ip6_tnl *t;
372 __be16 flags;
373
374 flags = p[0];
375 if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) {
376 if (flags&(GRE_VERSION|GRE_ROUTING))
377 return;
378 if (flags&GRE_KEY) {
379 grehlen += 4;
380 if (flags&GRE_CSUM)
381 grehlen += 4;
382 }
383 }
384
385 /* If only 8 bytes returned, keyed message will be dropped here */
Eric Dumazetb87fb392012-08-19 03:47:30 +0000386 if (!pskb_may_pull(skb, grehlen))
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000387 return;
Eric Dumazetb87fb392012-08-19 03:47:30 +0000388 ipv6h = (const struct ipv6hdr *)skb->data;
389 p = (__be16 *)(skb->data + offset);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000390
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000391 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
392 flags & GRE_KEY ?
393 *(((__be32 *)p) + (grehlen / 4) - 1) : 0,
394 p[1]);
395 if (t == NULL)
stephen hemminger0c5794a2012-09-24 18:12:24 +0000396 return;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000397
398 switch (type) {
399 __u32 teli;
400 struct ipv6_tlv_tnl_enc_lim *tel;
401 __u32 mtu;
402 case ICMPV6_DEST_UNREACH:
403 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
404 t->parms.name);
405 break;
406 case ICMPV6_TIME_EXCEED:
407 if (code == ICMPV6_EXC_HOPLIMIT) {
408 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
409 t->parms.name);
410 }
411 break;
412 case ICMPV6_PARAMPROB:
413 teli = 0;
414 if (code == ICMPV6_HDR_FIELD)
415 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
416
417 if (teli && teli == info - 2) {
418 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
419 if (tel->encap_limit == 0) {
420 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
421 t->parms.name);
422 }
423 } else {
424 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
425 t->parms.name);
426 }
427 break;
428 case ICMPV6_PKT_TOOBIG:
429 mtu = info - offset;
430 if (mtu < IPV6_MIN_MTU)
431 mtu = IPV6_MIN_MTU;
432 t->dev->mtu = mtu;
433 break;
434 }
435
436 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
437 t->err_count++;
438 else
439 t->err_count = 1;
440 t->err_time = jiffies;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000441}
442
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000443static int ip6gre_rcv(struct sk_buff *skb)
444{
445 const struct ipv6hdr *ipv6h;
446 u8 *h;
447 __be16 flags;
448 __sum16 csum = 0;
449 __be32 key = 0;
450 u32 seqno = 0;
451 struct ip6_tnl *tunnel;
452 int offset = 4;
453 __be16 gre_proto;
stephen hemmingereccc1bb2012-09-25 11:02:48 +0000454 int err;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000455
456 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
stephen hemminger0c5794a2012-09-24 18:12:24 +0000457 goto drop;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000458
459 ipv6h = ipv6_hdr(skb);
460 h = skb->data;
461 flags = *(__be16 *)h;
462
463 if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) {
464 /* - Version must be 0.
465 - We do not support routing headers.
466 */
467 if (flags&(GRE_VERSION|GRE_ROUTING))
stephen hemminger0c5794a2012-09-24 18:12:24 +0000468 goto drop;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000469
470 if (flags&GRE_CSUM) {
Tom Herbert81249be2014-05-07 16:51:57 -0700471 csum = skb_checksum_simple_validate(skb);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000472 offset += 4;
473 }
474 if (flags&GRE_KEY) {
475 key = *(__be32 *)(h + offset);
476 offset += 4;
477 }
478 if (flags&GRE_SEQ) {
479 seqno = ntohl(*(__be32 *)(h + offset));
480 offset += 4;
481 }
482 }
483
484 gre_proto = *(__be16 *)(h + 2);
485
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000486 tunnel = ip6gre_tunnel_lookup(skb->dev,
487 &ipv6h->saddr, &ipv6h->daddr, key,
488 gre_proto);
489 if (tunnel) {
Li RongQing8f849852014-01-04 13:57:59 +0800490 struct pcpu_sw_netstats *tstats;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000491
492 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
493 goto drop;
494
495 if (!ip6_tnl_rcv_ctl(tunnel, &ipv6h->daddr, &ipv6h->saddr)) {
496 tunnel->dev->stats.rx_dropped++;
497 goto drop;
498 }
499
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000500 skb->protocol = gre_proto;
501 /* WCCP version 1 and 2 protocol decoding.
502 * - Change protocol to IP
503 * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
504 */
505 if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) {
506 skb->protocol = htons(ETH_P_IP);
507 if ((*(h + offset) & 0xF0) != 0x40)
508 offset += 4;
509 }
510
511 skb->mac_header = skb->network_header;
512 __pskb_pull(skb, offset);
513 skb_postpull_rcsum(skb, skb_transport_header(skb), offset);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000514
515 if (((flags&GRE_CSUM) && csum) ||
516 (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) {
517 tunnel->dev->stats.rx_crc_errors++;
518 tunnel->dev->stats.rx_errors++;
519 goto drop;
520 }
521 if (tunnel->parms.i_flags&GRE_SEQ) {
522 if (!(flags&GRE_SEQ) ||
523 (tunnel->i_seqno &&
524 (s32)(seqno - tunnel->i_seqno) < 0)) {
525 tunnel->dev->stats.rx_fifo_errors++;
526 tunnel->dev->stats.rx_errors++;
527 goto drop;
528 }
529 tunnel->i_seqno = seqno + 1;
530 }
531
532 /* Warning: All skb pointers will be invalidated! */
533 if (tunnel->dev->type == ARPHRD_ETHER) {
534 if (!pskb_may_pull(skb, ETH_HLEN)) {
535 tunnel->dev->stats.rx_length_errors++;
536 tunnel->dev->stats.rx_errors++;
537 goto drop;
538 }
539
540 ipv6h = ipv6_hdr(skb);
541 skb->protocol = eth_type_trans(skb, tunnel->dev);
542 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
543 }
544
Nicolas Dichtelea231922013-09-02 15:34:58 +0200545 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
stephen hemmingereccc1bb2012-09-25 11:02:48 +0000546
547 skb_reset_network_header(skb);
548
549 err = IP6_ECN_decapsulate(ipv6h, skb);
550 if (unlikely(err)) {
551 if (log_ecn_error)
552 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
553 &ipv6h->saddr,
554 ipv6_get_dsfield(ipv6h));
555 if (err > 1) {
556 ++tunnel->dev->stats.rx_frame_errors;
557 ++tunnel->dev->stats.rx_errors;
558 goto drop;
559 }
560 }
561
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000562 tstats = this_cpu_ptr(tunnel->dev->tstats);
563 u64_stats_update_begin(&tstats->syncp);
564 tstats->rx_packets++;
565 tstats->rx_bytes += skb->len;
566 u64_stats_update_end(&tstats->syncp);
567
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000568 netif_rx(skb);
569
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000570 return 0;
571 }
572 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
573
574drop:
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000575 kfree_skb(skb);
576 return 0;
577}
578
579struct ipv6_tel_txoption {
580 struct ipv6_txoptions ops;
581 __u8 dst_opt[8];
582};
583
584static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
585{
586 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
587
588 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
589 opt->dst_opt[3] = 1;
590 opt->dst_opt[4] = encap_limit;
591 opt->dst_opt[5] = IPV6_TLV_PADN;
592 opt->dst_opt[6] = 1;
593
594 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
595 opt->ops.opt_nflen = 8;
596}
597
598static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
599 struct net_device *dev,
600 __u8 dsfield,
601 struct flowi6 *fl6,
602 int encap_limit,
603 __u32 *pmtu)
604{
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000605 struct ip6_tnl *tunnel = netdev_priv(dev);
Nicolas Dichtel22f08062014-04-22 10:15:24 +0200606 struct net *net = tunnel->net;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000607 struct net_device *tdev; /* Device to other host */
608 struct ipv6hdr *ipv6h; /* Our new IP header */
Hannes Frederic Sowa3da812d2013-09-29 05:40:50 +0200609 unsigned int max_headroom = 0; /* The extra header space needed */
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000610 int gre_hlen;
611 struct ipv6_tel_txoption opt;
612 int mtu;
613 struct dst_entry *dst = NULL, *ndst = NULL;
614 struct net_device_stats *stats = &tunnel->dev->stats;
615 int err = -1;
616 u8 proto;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000617 struct sk_buff *new_skb;
618
619 if (dev->type == ARPHRD_ETHER)
620 IPCB(skb)->flags = 0;
621
622 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) {
623 gre_hlen = 0;
624 ipv6h = (struct ipv6hdr *)skb->data;
625 fl6->daddr = ipv6h->daddr;
626 } else {
627 gre_hlen = tunnel->hlen;
628 fl6->daddr = tunnel->parms.raddr;
629 }
630
631 if (!fl6->flowi6_mark)
632 dst = ip6_tnl_dst_check(tunnel);
633
634 if (!dst) {
635 ndst = ip6_route_output(net, NULL, fl6);
636
637 if (ndst->error)
638 goto tx_err_link_failure;
639 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
640 if (IS_ERR(ndst)) {
641 err = PTR_ERR(ndst);
642 ndst = NULL;
643 goto tx_err_link_failure;
644 }
645 dst = ndst;
646 }
647
648 tdev = dst->dev;
649
650 if (tdev == dev) {
651 stats->collisions++;
652 net_warn_ratelimited("%s: Local routing loop detected!\n",
653 tunnel->parms.name);
654 goto tx_err_dst_release;
655 }
656
657 mtu = dst_mtu(dst) - sizeof(*ipv6h);
658 if (encap_limit >= 0) {
659 max_headroom += 8;
660 mtu -= 8;
661 }
662 if (mtu < IPV6_MIN_MTU)
663 mtu = IPV6_MIN_MTU;
664 if (skb_dst(skb))
665 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
666 if (skb->len > mtu) {
667 *pmtu = mtu;
668 err = -EMSGSIZE;
669 goto tx_err_dst_release;
670 }
671
672 if (tunnel->err_count > 0) {
673 if (time_before(jiffies,
674 tunnel->err_time + IP6TUNNEL_ERR_TIMEO)) {
675 tunnel->err_count--;
676
677 dst_link_failure(skb);
678 } else
679 tunnel->err_count = 0;
680 }
681
Nicolas Dichtel963a88b2013-09-02 15:34:57 +0200682 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
683
Hannes Frederic Sowa3da812d2013-09-29 05:40:50 +0200684 max_headroom += LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000685
686 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
687 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
688 new_skb = skb_realloc_headroom(skb, max_headroom);
689 if (max_headroom > dev->needed_headroom)
690 dev->needed_headroom = max_headroom;
691 if (!new_skb)
692 goto tx_err_dst_release;
693
694 if (skb->sk)
695 skb_set_owner_w(new_skb, skb->sk);
696 consume_skb(skb);
697 skb = new_skb;
698 }
699
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000700 if (fl6->flowi6_mark) {
701 skb_dst_set(skb, dst);
702 ndst = NULL;
703 } else {
704 skb_dst_set_noref(skb, dst);
705 }
706
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000707 proto = NEXTHDR_GRE;
708 if (encap_limit >= 0) {
709 init_tel_txopt(&opt, encap_limit);
710 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
711 }
712
Hannes Frederic Sowa3d483052013-08-18 13:46:52 +0200713 if (likely(!skb->encapsulation)) {
714 skb_reset_inner_headers(skb);
715 skb->encapsulation = 1;
716 }
717
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000718 skb_push(skb, gre_hlen);
719 skb_reset_network_header(skb);
Isaku Yamahataae782bb2012-12-24 16:51:04 +0000720 skb_set_transport_header(skb, sizeof(*ipv6h));
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000721
722 /*
723 * Push down and install the IP header.
724 */
725 ipv6h = ipv6_hdr(skb);
Tom Herbertcb1ce2e2014-07-01 21:33:10 -0700726 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield),
727 ip6_make_flowlabel(net, skb, fl6->flowlabel, false));
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000728 ipv6h->hop_limit = tunnel->parms.hop_limit;
729 ipv6h->nexthdr = proto;
730 ipv6h->saddr = fl6->saddr;
731 ipv6h->daddr = fl6->daddr;
732
733 ((__be16 *)(ipv6h + 1))[0] = tunnel->parms.o_flags;
734 ((__be16 *)(ipv6h + 1))[1] = (dev->type == ARPHRD_ETHER) ?
735 htons(ETH_P_TEB) : skb->protocol;
736
737 if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) {
738 __be32 *ptr = (__be32 *)(((u8 *)ipv6h) + tunnel->hlen - 4);
739
740 if (tunnel->parms.o_flags&GRE_SEQ) {
741 ++tunnel->o_seqno;
742 *ptr = htonl(tunnel->o_seqno);
743 ptr--;
744 }
745 if (tunnel->parms.o_flags&GRE_KEY) {
746 *ptr = tunnel->parms.o_key;
747 ptr--;
748 }
749 if (tunnel->parms.o_flags&GRE_CSUM) {
750 *ptr = 0;
751 *(__sum16 *)ptr = ip_compute_csum((void *)(ipv6h+1),
752 skb->len - sizeof(struct ipv6hdr));
753 }
754 }
755
Cong Wange8f72ea2013-03-09 23:00:39 +0000756 ip6tunnel_xmit(skb, dev);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000757 if (ndst)
758 ip6_tnl_dst_store(tunnel, ndst);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000759 return 0;
760tx_err_link_failure:
761 stats->tx_carrier_errors++;
762 dst_link_failure(skb);
763tx_err_dst_release:
764 dst_release(ndst);
765 return err;
766}
767
768static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
769{
770 struct ip6_tnl *t = netdev_priv(dev);
771 const struct iphdr *iph = ip_hdr(skb);
772 int encap_limit = -1;
773 struct flowi6 fl6;
774 __u8 dsfield;
775 __u32 mtu;
776 int err;
777
778 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
779 encap_limit = t->parms.encap_limit;
780
781 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
782 fl6.flowi6_proto = IPPROTO_IPIP;
783
784 dsfield = ipv4_get_dsfield(iph);
785
786 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
787 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
788 & IPV6_TCLASS_MASK;
789 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
790 fl6.flowi6_mark = skb->mark;
791
792 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
793 if (err != 0) {
794 /* XXX: send ICMP error even if DF is not set. */
795 if (err == -EMSGSIZE)
796 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
797 htonl(mtu));
798 return -1;
799 }
800
801 return 0;
802}
803
804static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
805{
806 struct ip6_tnl *t = netdev_priv(dev);
807 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
808 int encap_limit = -1;
809 __u16 offset;
810 struct flowi6 fl6;
811 __u8 dsfield;
812 __u32 mtu;
813 int err;
814
815 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
816 return -1;
817
818 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
819 if (offset > 0) {
820 struct ipv6_tlv_tnl_enc_lim *tel;
821 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
822 if (tel->encap_limit == 0) {
823 icmpv6_send(skb, ICMPV6_PARAMPROB,
824 ICMPV6_HDR_FIELD, offset + 2);
825 return -1;
826 }
827 encap_limit = tel->encap_limit - 1;
828 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
829 encap_limit = t->parms.encap_limit;
830
831 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
832 fl6.flowi6_proto = IPPROTO_IPV6;
833
834 dsfield = ipv6_get_dsfield(ipv6h);
835 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
836 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
837 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
Florent Fourcot3308de22013-12-08 15:47:00 +0100838 fl6.flowlabel |= ip6_flowlabel(ipv6h);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000839 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
840 fl6.flowi6_mark = skb->mark;
841
842 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
843 if (err != 0) {
844 if (err == -EMSGSIZE)
845 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
846 return -1;
847 }
848
849 return 0;
850}
851
852/**
853 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
854 * @t: the outgoing tunnel device
855 * @hdr: IPv6 header from the incoming packet
856 *
857 * Description:
858 * Avoid trivial tunneling loop by checking that tunnel exit-point
859 * doesn't match source of incoming packet.
860 *
861 * Return:
862 * 1 if conflict,
863 * 0 else
864 **/
865
866static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
867 const struct ipv6hdr *hdr)
868{
869 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
870}
871
872static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
873{
874 struct ip6_tnl *t = netdev_priv(dev);
875 int encap_limit = -1;
876 struct flowi6 fl6;
877 __u32 mtu;
878 int err;
879
880 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
881 encap_limit = t->parms.encap_limit;
882
883 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
884 fl6.flowi6_proto = skb->protocol;
885
886 err = ip6gre_xmit2(skb, dev, 0, &fl6, encap_limit, &mtu);
887
888 return err;
889}
890
891static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
892 struct net_device *dev)
893{
894 struct ip6_tnl *t = netdev_priv(dev);
895 struct net_device_stats *stats = &t->dev->stats;
896 int ret;
897
898 if (!ip6_tnl_xmit_ctl(t))
Tommi Rantala41ab3e32013-02-06 03:24:02 +0000899 goto tx_err;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000900
901 switch (skb->protocol) {
902 case htons(ETH_P_IP):
903 ret = ip6gre_xmit_ipv4(skb, dev);
904 break;
905 case htons(ETH_P_IPV6):
906 ret = ip6gre_xmit_ipv6(skb, dev);
907 break;
908 default:
909 ret = ip6gre_xmit_other(skb, dev);
910 break;
911 }
912
913 if (ret < 0)
914 goto tx_err;
915
916 return NETDEV_TX_OK;
917
918tx_err:
919 stats->tx_errors++;
920 stats->tx_dropped++;
921 kfree_skb(skb);
922 return NETDEV_TX_OK;
923}
924
925static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
926{
927 struct net_device *dev = t->dev;
928 struct __ip6_tnl_parm *p = &t->parms;
929 struct flowi6 *fl6 = &t->fl.u.ip6;
930 int addend = sizeof(struct ipv6hdr) + 4;
931
932 if (dev->type != ARPHRD_ETHER) {
933 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
934 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
935 }
936
937 /* Set up flowi template */
938 fl6->saddr = p->laddr;
939 fl6->daddr = p->raddr;
940 fl6->flowi6_oif = p->link;
941 fl6->flowlabel = 0;
942
943 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
944 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
945 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
946 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
947
948 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
949 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
950
951 if (p->flags&IP6_TNL_F_CAP_XMIT &&
952 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
953 dev->flags |= IFF_POINTOPOINT;
954 else
955 dev->flags &= ~IFF_POINTOPOINT;
956
957 dev->iflink = p->link;
958
959 /* Precalculate GRE options length */
960 if (t->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) {
961 if (t->parms.o_flags&GRE_CSUM)
962 addend += 4;
963 if (t->parms.o_flags&GRE_KEY)
964 addend += 4;
965 if (t->parms.o_flags&GRE_SEQ)
966 addend += 4;
967 }
Oussama Ghorbelbf581752013-10-10 18:50:27 +0100968 t->hlen = addend;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000969
970 if (p->flags & IP6_TNL_F_CAP_XMIT) {
971 int strict = (ipv6_addr_type(&p->raddr) &
972 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
973
Nicolas Dichtel22f08062014-04-22 10:15:24 +0200974 struct rt6_info *rt = rt6_lookup(t->net,
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000975 &p->raddr, &p->laddr,
976 p->link, strict);
977
978 if (rt == NULL)
979 return;
980
981 if (rt->dst.dev) {
982 dev->hard_header_len = rt->dst.dev->hard_header_len + addend;
983
984 if (set_mtu) {
985 dev->mtu = rt->dst.dev->mtu - addend;
986 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
987 dev->mtu -= 8;
988
989 if (dev->mtu < IPV6_MIN_MTU)
990 dev->mtu = IPV6_MIN_MTU;
991 }
992 }
Amerigo Wang94e187c2012-10-29 00:13:19 +0000993 ip6_rt_put(rt);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000994 }
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000995}
996
997static int ip6gre_tnl_change(struct ip6_tnl *t,
998 const struct __ip6_tnl_parm *p, int set_mtu)
999{
1000 t->parms.laddr = p->laddr;
1001 t->parms.raddr = p->raddr;
1002 t->parms.flags = p->flags;
1003 t->parms.hop_limit = p->hop_limit;
1004 t->parms.encap_limit = p->encap_limit;
1005 t->parms.flowinfo = p->flowinfo;
1006 t->parms.link = p->link;
1007 t->parms.proto = p->proto;
1008 t->parms.i_key = p->i_key;
1009 t->parms.o_key = p->o_key;
1010 t->parms.i_flags = p->i_flags;
1011 t->parms.o_flags = p->o_flags;
1012 ip6_tnl_dst_reset(t);
1013 ip6gre_tnl_link_config(t, set_mtu);
1014 return 0;
1015}
1016
1017static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1018 const struct ip6_tnl_parm2 *u)
1019{
1020 p->laddr = u->laddr;
1021 p->raddr = u->raddr;
1022 p->flags = u->flags;
1023 p->hop_limit = u->hop_limit;
1024 p->encap_limit = u->encap_limit;
1025 p->flowinfo = u->flowinfo;
1026 p->link = u->link;
1027 p->i_key = u->i_key;
1028 p->o_key = u->o_key;
1029 p->i_flags = u->i_flags;
1030 p->o_flags = u->o_flags;
1031 memcpy(p->name, u->name, sizeof(u->name));
1032}
1033
1034static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1035 const struct __ip6_tnl_parm *p)
1036{
1037 u->proto = IPPROTO_GRE;
1038 u->laddr = p->laddr;
1039 u->raddr = p->raddr;
1040 u->flags = p->flags;
1041 u->hop_limit = p->hop_limit;
1042 u->encap_limit = p->encap_limit;
1043 u->flowinfo = p->flowinfo;
1044 u->link = p->link;
1045 u->i_key = p->i_key;
1046 u->o_key = p->o_key;
1047 u->i_flags = p->i_flags;
1048 u->o_flags = p->o_flags;
1049 memcpy(u->name, p->name, sizeof(u->name));
1050}
1051
1052static int ip6gre_tunnel_ioctl(struct net_device *dev,
1053 struct ifreq *ifr, int cmd)
1054{
1055 int err = 0;
1056 struct ip6_tnl_parm2 p;
1057 struct __ip6_tnl_parm p1;
Nicolas Dichtel22f08062014-04-22 10:15:24 +02001058 struct ip6_tnl *t = netdev_priv(dev);
1059 struct net *net = t->net;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001060 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1061
1062 switch (cmd) {
1063 case SIOCGETTUNNEL:
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001064 if (dev == ign->fb_tunnel_dev) {
1065 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1066 err = -EFAULT;
1067 break;
1068 }
1069 ip6gre_tnl_parm_from_user(&p1, &p);
1070 t = ip6gre_tunnel_locate(net, &p1, 0);
Nicolas Dichtel22f08062014-04-22 10:15:24 +02001071 if (t == NULL)
1072 t = netdev_priv(dev);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001073 }
Amerigo Wang5dbd5062013-05-09 21:56:37 +00001074 memset(&p, 0, sizeof(p));
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001075 ip6gre_tnl_parm_to_user(&p, &t->parms);
1076 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1077 err = -EFAULT;
1078 break;
1079
1080 case SIOCADDTUNNEL:
1081 case SIOCCHGTUNNEL:
1082 err = -EPERM;
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00001083 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001084 goto done;
1085
1086 err = -EFAULT;
1087 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1088 goto done;
1089
1090 err = -EINVAL;
1091 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1092 goto done;
1093
1094 if (!(p.i_flags&GRE_KEY))
1095 p.i_key = 0;
1096 if (!(p.o_flags&GRE_KEY))
1097 p.o_key = 0;
1098
1099 ip6gre_tnl_parm_from_user(&p1, &p);
1100 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1101
1102 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1103 if (t != NULL) {
1104 if (t->dev != dev) {
1105 err = -EEXIST;
1106 break;
1107 }
1108 } else {
1109 t = netdev_priv(dev);
1110
1111 ip6gre_tunnel_unlink(ign, t);
1112 synchronize_net();
1113 ip6gre_tnl_change(t, &p1, 1);
1114 ip6gre_tunnel_link(ign, t);
1115 netdev_state_change(dev);
1116 }
1117 }
1118
1119 if (t) {
1120 err = 0;
1121
Amerigo Wang5dbd5062013-05-09 21:56:37 +00001122 memset(&p, 0, sizeof(p));
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001123 ip6gre_tnl_parm_to_user(&p, &t->parms);
1124 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1125 err = -EFAULT;
1126 } else
1127 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1128 break;
1129
1130 case SIOCDELTUNNEL:
1131 err = -EPERM;
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00001132 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001133 goto done;
1134
1135 if (dev == ign->fb_tunnel_dev) {
1136 err = -EFAULT;
1137 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1138 goto done;
1139 err = -ENOENT;
1140 ip6gre_tnl_parm_from_user(&p1, &p);
1141 t = ip6gre_tunnel_locate(net, &p1, 0);
1142 if (t == NULL)
1143 goto done;
1144 err = -EPERM;
1145 if (t == netdev_priv(ign->fb_tunnel_dev))
1146 goto done;
1147 dev = t->dev;
1148 }
1149 unregister_netdevice(dev);
1150 err = 0;
1151 break;
1152
1153 default:
1154 err = -EINVAL;
1155 }
1156
1157done:
1158 return err;
1159}
1160
1161static int ip6gre_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1162{
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001163 if (new_mtu < 68 ||
Oussama Ghorbel0e719e32013-10-07 18:50:05 +01001164 new_mtu > 0xFFF8 - dev->hard_header_len)
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001165 return -EINVAL;
1166 dev->mtu = new_mtu;
1167 return 0;
1168}
1169
1170static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1171 unsigned short type,
1172 const void *daddr, const void *saddr, unsigned int len)
1173{
1174 struct ip6_tnl *t = netdev_priv(dev);
1175 struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen);
1176 __be16 *p = (__be16 *)(ipv6h+1);
1177
Tom Herbertcb1ce2e2014-07-01 21:33:10 -07001178 ip6_flow_hdr(ipv6h, 0,
1179 ip6_make_flowlabel(dev_net(dev), skb,
1180 t->fl.u.ip6.flowlabel, false));
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001181 ipv6h->hop_limit = t->parms.hop_limit;
1182 ipv6h->nexthdr = NEXTHDR_GRE;
1183 ipv6h->saddr = t->parms.laddr;
1184 ipv6h->daddr = t->parms.raddr;
1185
1186 p[0] = t->parms.o_flags;
1187 p[1] = htons(type);
1188
1189 /*
1190 * Set the source hardware address.
1191 */
1192
1193 if (saddr)
1194 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1195 if (daddr)
1196 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1197 if (!ipv6_addr_any(&ipv6h->daddr))
1198 return t->hlen;
1199
1200 return -t->hlen;
1201}
1202
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001203static const struct header_ops ip6gre_header_ops = {
1204 .create = ip6gre_header,
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001205};
1206
1207static const struct net_device_ops ip6gre_netdev_ops = {
1208 .ndo_init = ip6gre_tunnel_init,
1209 .ndo_uninit = ip6gre_tunnel_uninit,
1210 .ndo_start_xmit = ip6gre_tunnel_xmit,
1211 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1212 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
Pravin B Shelarf61dd382013-03-25 14:50:00 +00001213 .ndo_get_stats64 = ip_tunnel_get_stats64,
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001214};
1215
1216static void ip6gre_dev_free(struct net_device *dev)
1217{
1218 free_percpu(dev->tstats);
1219 free_netdev(dev);
1220}
1221
1222static void ip6gre_tunnel_setup(struct net_device *dev)
1223{
1224 struct ip6_tnl *t;
1225
1226 dev->netdev_ops = &ip6gre_netdev_ops;
1227 dev->destructor = ip6gre_dev_free;
1228
1229 dev->type = ARPHRD_IP6GRE;
1230 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr) + 4;
1231 dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr) - 4;
1232 t = netdev_priv(dev);
1233 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1234 dev->mtu -= 8;
1235 dev->flags |= IFF_NOARP;
1236 dev->iflink = 0;
1237 dev->addr_len = sizeof(struct in6_addr);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001238 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1239}
1240
1241static int ip6gre_tunnel_init(struct net_device *dev)
1242{
1243 struct ip6_tnl *tunnel;
John Stultz827da442013-10-07 15:51:58 -07001244 int i;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001245
1246 tunnel = netdev_priv(dev);
1247
1248 tunnel->dev = dev;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001249 tunnel->net = dev_net(dev);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001250 strcpy(tunnel->parms.name, dev->name);
1251
1252 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1253 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1254
1255 if (ipv6_addr_any(&tunnel->parms.raddr))
1256 dev->header_ops = &ip6gre_header_ops;
1257
Li RongQing8f849852014-01-04 13:57:59 +08001258 dev->tstats = alloc_percpu(struct pcpu_sw_netstats);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001259 if (!dev->tstats)
1260 return -ENOMEM;
1261
John Stultz827da442013-10-07 15:51:58 -07001262 for_each_possible_cpu(i) {
Li RongQing8f849852014-01-04 13:57:59 +08001263 struct pcpu_sw_netstats *ip6gre_tunnel_stats;
John Stultz827da442013-10-07 15:51:58 -07001264 ip6gre_tunnel_stats = per_cpu_ptr(dev->tstats, i);
1265 u64_stats_init(&ip6gre_tunnel_stats->syncp);
1266 }
1267
1268
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001269 return 0;
1270}
1271
1272static void ip6gre_fb_tunnel_init(struct net_device *dev)
1273{
1274 struct ip6_tnl *tunnel = netdev_priv(dev);
1275
1276 tunnel->dev = dev;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001277 tunnel->net = dev_net(dev);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001278 strcpy(tunnel->parms.name, dev->name);
1279
1280 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1281
1282 dev_hold(dev);
1283}
1284
1285
1286static struct inet6_protocol ip6gre_protocol __read_mostly = {
1287 .handler = ip6gre_rcv,
1288 .err_handler = ip6gre_err,
1289 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1290};
1291
Nicolas Dichtel22f08062014-04-22 10:15:24 +02001292static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001293{
Nicolas Dichtel22f08062014-04-22 10:15:24 +02001294 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1295 struct net_device *dev, *aux;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001296 int prio;
1297
Nicolas Dichtel22f08062014-04-22 10:15:24 +02001298 for_each_netdev_safe(net, dev, aux)
1299 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1300 dev->rtnl_link_ops == &ip6gre_tap_ops)
1301 unregister_netdevice_queue(dev, head);
1302
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001303 for (prio = 0; prio < 4; prio++) {
1304 int h;
1305 for (h = 0; h < HASH_SIZE; h++) {
1306 struct ip6_tnl *t;
1307
1308 t = rtnl_dereference(ign->tunnels[prio][h]);
1309
1310 while (t != NULL) {
Nicolas Dichtel22f08062014-04-22 10:15:24 +02001311 /* If dev is in the same netns, it has already
1312 * been added to the list by the previous loop.
1313 */
1314 if (!net_eq(dev_net(t->dev), net))
1315 unregister_netdevice_queue(t->dev,
1316 head);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001317 t = rtnl_dereference(t->next);
1318 }
1319 }
1320 }
1321}
1322
1323static int __net_init ip6gre_init_net(struct net *net)
1324{
1325 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1326 int err;
1327
1328 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1329 ip6gre_tunnel_setup);
1330 if (!ign->fb_tunnel_dev) {
1331 err = -ENOMEM;
1332 goto err_alloc_dev;
1333 }
1334 dev_net_set(ign->fb_tunnel_dev, net);
Nicolas Dichtel22f08062014-04-22 10:15:24 +02001335 /* FB netdevice is special: we have one, and only one per netns.
1336 * Allowing to move it to another netns is clearly unsafe.
1337 */
1338 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1339
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001340
1341 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1342 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1343
1344 err = register_netdev(ign->fb_tunnel_dev);
1345 if (err)
1346 goto err_reg_dev;
1347
1348 rcu_assign_pointer(ign->tunnels_wc[0],
1349 netdev_priv(ign->fb_tunnel_dev));
1350 return 0;
1351
1352err_reg_dev:
1353 ip6gre_dev_free(ign->fb_tunnel_dev);
1354err_alloc_dev:
1355 return err;
1356}
1357
1358static void __net_exit ip6gre_exit_net(struct net *net)
1359{
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001360 LIST_HEAD(list);
1361
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001362 rtnl_lock();
Nicolas Dichtel22f08062014-04-22 10:15:24 +02001363 ip6gre_destroy_tunnels(net, &list);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001364 unregister_netdevice_many(&list);
1365 rtnl_unlock();
1366}
1367
1368static struct pernet_operations ip6gre_net_ops = {
1369 .init = ip6gre_init_net,
1370 .exit = ip6gre_exit_net,
1371 .id = &ip6gre_net_id,
1372 .size = sizeof(struct ip6gre_net),
1373};
1374
1375static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
1376{
1377 __be16 flags;
1378
1379 if (!data)
1380 return 0;
1381
1382 flags = 0;
1383 if (data[IFLA_GRE_IFLAGS])
1384 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1385 if (data[IFLA_GRE_OFLAGS])
1386 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1387 if (flags & (GRE_VERSION|GRE_ROUTING))
1388 return -EINVAL;
1389
1390 return 0;
1391}
1392
1393static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
1394{
1395 struct in6_addr daddr;
1396
1397 if (tb[IFLA_ADDRESS]) {
1398 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1399 return -EINVAL;
1400 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1401 return -EADDRNOTAVAIL;
1402 }
1403
1404 if (!data)
1405 goto out;
1406
1407 if (data[IFLA_GRE_REMOTE]) {
1408 nla_memcpy(&daddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1409 if (ipv6_addr_any(&daddr))
1410 return -EINVAL;
1411 }
1412
1413out:
1414 return ip6gre_tunnel_validate(tb, data);
1415}
1416
1417
1418static void ip6gre_netlink_parms(struct nlattr *data[],
1419 struct __ip6_tnl_parm *parms)
1420{
1421 memset(parms, 0, sizeof(*parms));
1422
1423 if (!data)
1424 return;
1425
1426 if (data[IFLA_GRE_LINK])
1427 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1428
1429 if (data[IFLA_GRE_IFLAGS])
1430 parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]);
1431
1432 if (data[IFLA_GRE_OFLAGS])
1433 parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]);
1434
1435 if (data[IFLA_GRE_IKEY])
1436 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1437
1438 if (data[IFLA_GRE_OKEY])
1439 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1440
1441 if (data[IFLA_GRE_LOCAL])
1442 nla_memcpy(&parms->laddr, data[IFLA_GRE_LOCAL], sizeof(struct in6_addr));
1443
1444 if (data[IFLA_GRE_REMOTE])
1445 nla_memcpy(&parms->raddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1446
1447 if (data[IFLA_GRE_TTL])
1448 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1449
1450 if (data[IFLA_GRE_ENCAP_LIMIT])
1451 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1452
1453 if (data[IFLA_GRE_FLOWINFO])
1454 parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]);
1455
1456 if (data[IFLA_GRE_FLAGS])
1457 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1458}
1459
1460static int ip6gre_tap_init(struct net_device *dev)
1461{
1462 struct ip6_tnl *tunnel;
1463
1464 tunnel = netdev_priv(dev);
1465
1466 tunnel->dev = dev;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001467 tunnel->net = dev_net(dev);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001468 strcpy(tunnel->parms.name, dev->name);
1469
1470 ip6gre_tnl_link_config(tunnel, 1);
1471
WANG Cong1c213bd2014-02-13 11:46:28 -08001472 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001473 if (!dev->tstats)
1474 return -ENOMEM;
1475
1476 return 0;
1477}
1478
1479static const struct net_device_ops ip6gre_tap_netdev_ops = {
1480 .ndo_init = ip6gre_tap_init,
1481 .ndo_uninit = ip6gre_tunnel_uninit,
1482 .ndo_start_xmit = ip6gre_tunnel_xmit,
1483 .ndo_set_mac_address = eth_mac_addr,
1484 .ndo_validate_addr = eth_validate_addr,
1485 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
Pravin B Shelarf61dd382013-03-25 14:50:00 +00001486 .ndo_get_stats64 = ip_tunnel_get_stats64,
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001487};
1488
1489static void ip6gre_tap_setup(struct net_device *dev)
1490{
1491
1492 ether_setup(dev);
1493
1494 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1495 dev->destructor = ip6gre_dev_free;
1496
1497 dev->iflink = 0;
1498 dev->features |= NETIF_F_NETNS_LOCAL;
1499}
1500
1501static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1502 struct nlattr *tb[], struct nlattr *data[])
1503{
1504 struct ip6_tnl *nt;
1505 struct net *net = dev_net(dev);
1506 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1507 int err;
1508
1509 nt = netdev_priv(dev);
1510 ip6gre_netlink_parms(data, &nt->parms);
1511
1512 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1513 return -EEXIST;
1514
1515 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1516 eth_hw_addr_random(dev);
1517
1518 nt->dev = dev;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001519 nt->net = dev_net(dev);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001520 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1521
1522 /* Can use a lockless transmit, unless we generate output sequences */
1523 if (!(nt->parms.o_flags & GRE_SEQ))
1524 dev->features |= NETIF_F_LLTX;
1525
1526 err = register_netdevice(dev);
1527 if (err)
1528 goto out;
1529
1530 dev_hold(dev);
1531 ip6gre_tunnel_link(ign, nt);
1532
1533out:
1534 return err;
1535}
1536
1537static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1538 struct nlattr *data[])
1539{
Nicolas Dichtel22f08062014-04-22 10:15:24 +02001540 struct ip6_tnl *t, *nt = netdev_priv(dev);
1541 struct net *net = nt->net;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001542 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1543 struct __ip6_tnl_parm p;
1544
1545 if (dev == ign->fb_tunnel_dev)
1546 return -EINVAL;
1547
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001548 ip6gre_netlink_parms(data, &p);
1549
1550 t = ip6gre_tunnel_locate(net, &p, 0);
1551
1552 if (t) {
1553 if (t->dev != dev)
1554 return -EEXIST;
1555 } else {
1556 t = nt;
1557
1558 ip6gre_tunnel_unlink(ign, t);
1559 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1560 ip6gre_tunnel_link(ign, t);
1561 netdev_state_change(dev);
1562 }
1563
1564 return 0;
1565}
1566
Nicolas Dichtel54d63f782014-04-14 17:11:38 +02001567static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
1568{
1569 struct net *net = dev_net(dev);
1570 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1571
1572 if (dev != ign->fb_tunnel_dev)
1573 unregister_netdevice_queue(dev, head);
1574}
1575
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001576static size_t ip6gre_get_size(const struct net_device *dev)
1577{
1578 return
1579 /* IFLA_GRE_LINK */
1580 nla_total_size(4) +
1581 /* IFLA_GRE_IFLAGS */
1582 nla_total_size(2) +
1583 /* IFLA_GRE_OFLAGS */
1584 nla_total_size(2) +
1585 /* IFLA_GRE_IKEY */
1586 nla_total_size(4) +
1587 /* IFLA_GRE_OKEY */
1588 nla_total_size(4) +
1589 /* IFLA_GRE_LOCAL */
Nicolas Dichtela3754132012-11-09 05:34:56 +00001590 nla_total_size(sizeof(struct in6_addr)) +
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001591 /* IFLA_GRE_REMOTE */
Nicolas Dichtela3754132012-11-09 05:34:56 +00001592 nla_total_size(sizeof(struct in6_addr)) +
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001593 /* IFLA_GRE_TTL */
1594 nla_total_size(1) +
1595 /* IFLA_GRE_TOS */
1596 nla_total_size(1) +
1597 /* IFLA_GRE_ENCAP_LIMIT */
1598 nla_total_size(1) +
1599 /* IFLA_GRE_FLOWINFO */
1600 nla_total_size(4) +
1601 /* IFLA_GRE_FLAGS */
1602 nla_total_size(4) +
1603 0;
1604}
1605
1606static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1607{
1608 struct ip6_tnl *t = netdev_priv(dev);
1609 struct __ip6_tnl_parm *p = &t->parms;
1610
1611 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1612 nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) ||
1613 nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) ||
1614 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1615 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
Nicolas Dichtela3754132012-11-09 05:34:56 +00001616 nla_put(skb, IFLA_GRE_LOCAL, sizeof(struct in6_addr), &p->laddr) ||
1617 nla_put(skb, IFLA_GRE_REMOTE, sizeof(struct in6_addr), &p->raddr) ||
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001618 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1619 /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/
1620 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1621 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1622 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags))
1623 goto nla_put_failure;
1624 return 0;
1625
1626nla_put_failure:
1627 return -EMSGSIZE;
1628}
1629
1630static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1631 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1632 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1633 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1634 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1635 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1636 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1637 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1638 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1639 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1640 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1641 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1642};
1643
1644static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1645 .kind = "ip6gre",
1646 .maxtype = IFLA_GRE_MAX,
1647 .policy = ip6gre_policy,
1648 .priv_size = sizeof(struct ip6_tnl),
1649 .setup = ip6gre_tunnel_setup,
1650 .validate = ip6gre_tunnel_validate,
1651 .newlink = ip6gre_newlink,
1652 .changelink = ip6gre_changelink,
Nicolas Dichtel54d63f782014-04-14 17:11:38 +02001653 .dellink = ip6gre_dellink,
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001654 .get_size = ip6gre_get_size,
1655 .fill_info = ip6gre_fill_info,
1656};
1657
1658static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1659 .kind = "ip6gretap",
1660 .maxtype = IFLA_GRE_MAX,
1661 .policy = ip6gre_policy,
1662 .priv_size = sizeof(struct ip6_tnl),
1663 .setup = ip6gre_tap_setup,
1664 .validate = ip6gre_tap_validate,
1665 .newlink = ip6gre_newlink,
1666 .changelink = ip6gre_changelink,
1667 .get_size = ip6gre_get_size,
1668 .fill_info = ip6gre_fill_info,
1669};
1670
1671/*
1672 * And now the modules code and kernel interface.
1673 */
1674
1675static int __init ip6gre_init(void)
1676{
1677 int err;
1678
1679 pr_info("GRE over IPv6 tunneling driver\n");
1680
1681 err = register_pernet_device(&ip6gre_net_ops);
1682 if (err < 0)
1683 return err;
1684
1685 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1686 if (err < 0) {
1687 pr_info("%s: can't add protocol\n", __func__);
1688 goto add_proto_failed;
1689 }
1690
1691 err = rtnl_link_register(&ip6gre_link_ops);
1692 if (err < 0)
1693 goto rtnl_link_failed;
1694
1695 err = rtnl_link_register(&ip6gre_tap_ops);
1696 if (err < 0)
1697 goto tap_ops_failed;
1698
1699out:
1700 return err;
1701
1702tap_ops_failed:
1703 rtnl_link_unregister(&ip6gre_link_ops);
1704rtnl_link_failed:
1705 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1706add_proto_failed:
1707 unregister_pernet_device(&ip6gre_net_ops);
1708 goto out;
1709}
1710
1711static void __exit ip6gre_fini(void)
1712{
1713 rtnl_link_unregister(&ip6gre_tap_ops);
1714 rtnl_link_unregister(&ip6gre_link_ops);
1715 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1716 unregister_pernet_device(&ip6gre_net_ops);
1717}
1718
1719module_init(ip6gre_init);
1720module_exit(ip6gre_fini);
1721MODULE_LICENSE("GPL");
1722MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1723MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1724MODULE_ALIAS_RTNL_LINK("ip6gre");
1725MODULE_ALIAS_NETDEV("ip6gre0");