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c12b395a 1/*
2 * GRE over IPv6 protocol decoder.
3 *
4 * Authors: Dmitry Kozlov (xeb@mail.ru)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 */
12
13#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15#include <linux/capability.h>
16#include <linux/module.h>
17#include <linux/types.h>
18#include <linux/kernel.h>
19#include <linux/slab.h>
20#include <linux/uaccess.h>
21#include <linux/skbuff.h>
22#include <linux/netdevice.h>
23#include <linux/in.h>
24#include <linux/tcp.h>
25#include <linux/udp.h>
26#include <linux/if_arp.h>
c12b395a 27#include <linux/init.h>
28#include <linux/in6.h>
29#include <linux/inetdevice.h>
30#include <linux/igmp.h>
31#include <linux/netfilter_ipv4.h>
32#include <linux/etherdevice.h>
33#include <linux/if_ether.h>
34#include <linux/hash.h>
35#include <linux/if_tunnel.h>
36#include <linux/ip6_tunnel.h>
37
38#include <net/sock.h>
39#include <net/ip.h>
c5441932 40#include <net/ip_tunnels.h>
c12b395a 41#include <net/icmp.h>
42#include <net/protocol.h>
43#include <net/addrconf.h>
44#include <net/arp.h>
45#include <net/checksum.h>
46#include <net/dsfield.h>
47#include <net/inet_ecn.h>
48#include <net/xfrm.h>
49#include <net/net_namespace.h>
50#include <net/netns/generic.h>
51#include <net/rtnetlink.h>
52
53#include <net/ipv6.h>
54#include <net/ip6_fib.h>
55#include <net/ip6_route.h>
56#include <net/ip6_tunnel.h>
308edfdf 57#include <net/gre.h>
c12b395a 58
59
eccc1bb8 60static 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
e87a8f24
JK		 64#define IP6_GRE_HASH_SIZE_SHIFT 5
65#define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
c12b395a 66
c7d03a00 67static unsigned int ip6gre_net_id __read_mostly;
c12b395a 68struct ip6gre_net {
e87a8f24 69 struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
c12b395a 70
71 struct net_device *fb_tunnel_dev;
72};
73
74static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
22f08069 75static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
c12b395a 76static int ip6gre_tunnel_init(struct net_device *dev);
77static void ip6gre_tunnel_setup(struct net_device *dev);
78static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
79static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
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
e87a8f24 99#define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
c12b395a 100static u32 HASH_ADDR(const struct in6_addr *addr)
101{
102 u32 hash = ipv6_addr_hash(addr);
103
e87a8f24 104 return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
c12b395a 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]
c12b395a 111
c12b395a 112/* 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
e086cadc 128 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
c12b395a 129 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
e086cadc 153 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
c12b395a 154 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
e086cadc 177 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
c12b395a 178 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
e086cadc 203 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
c12b395a 204 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
53b24b8f 226 if (cand)
c12b395a 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);
cd0a0bd9
SK		 317 if (t && create)
318 return NULL;
c12b395a 319 if (t || !create)
320 return t;
321
322 if (parms->name[0])
323 strlcpy(name, parms->name, IFNAMSIZ);
324 else
325 strcpy(name, "ip6gre%d");
326
c835a677
TG		 327 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
328 ip6gre_tunnel_setup);
c12b395a 329 if (!dev)
330 return NULL;
331
332 dev_net_set(dev, net);
333
334 nt = netdev_priv(dev);
335 nt->parms = *parms;
336 dev->rtnl_link_ops = &ip6gre_link_ops;
337
338 nt->dev = dev;
0bd87628 339 nt->net = dev_net(dev);
c12b395a 340 ip6gre_tnl_link_config(nt, 1);
341
342 if (register_netdevice(dev) < 0)
343 goto failed_free;
344
345 /* Can use a lockless transmit, unless we generate output sequences */
b45bd1d7 346 if (!(nt->parms.o_flags & TUNNEL_SEQ))
c12b395a 347 dev->features |= NETIF_F_LLTX;
348
349 dev_hold(dev);
350 ip6gre_tunnel_link(ign, nt);
351 return nt;
352
353failed_free:
354 free_netdev(dev);
355 return NULL;
356}
357
358static void ip6gre_tunnel_uninit(struct net_device *dev)
359{
22f08069
ND		 360 struct ip6_tnl *t = netdev_priv(dev);
361 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
c12b395a 362
22f08069 363 ip6gre_tunnel_unlink(ign, t);
607f725f 364 dst_cache_reset(&t->dst_cache);
c12b395a 365 dev_put(dev);
366}
367
368
369static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
7892032c 370 u8 type, u8 code, int offset, __be32 info)
c12b395a 371{
929fc032 372 struct net *net = dev_net(skb->dev);
7892032c
ED		 373 const struct gre_base_hdr *greh;
374 const struct ipv6hdr *ipv6h;
375 int grehlen = sizeof(*greh);
c12b395a 376 struct ip6_tnl *t;
7892032c 377 int key_off = 0;
c12b395a 378 __be16 flags;
7892032c 379 __be32 key;
c12b395a 380
7892032c
ED		 381 if (!pskb_may_pull(skb, offset + grehlen))
382 return;
383 greh = (const struct gre_base_hdr *)(skb->data + offset);
384 flags = greh->flags;
385 if (flags & (GRE_VERSION | GRE_ROUTING))
386 return;
387 if (flags & GRE_CSUM)
388 grehlen += 4;
389 if (flags & GRE_KEY) {
390 key_off = grehlen + offset;
391 grehlen += 4;
c12b395a 392 }
393
7892032c 394 if (!pskb_may_pull(skb, offset + grehlen))
c12b395a 395 return;
b87fb39e 396 ipv6h = (const struct ipv6hdr *)skb->data;
7892032c
ED		 397 greh = (const struct gre_base_hdr *)(skb->data + offset);
398 key = key_off ? *(__be32 *)(skb->data + key_off) : 0;
c12b395a 399
c12b395a 400 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
7892032c 401 key, greh->protocol);
63159f29 402 if (!t)
0c5794a6 403 return;
c12b395a 404
405 switch (type) {
c12b395a 406 struct ipv6_tlv_tnl_enc_lim *tel;
fe1a4ca0 407 __u32 teli;
c12b395a 408 case ICMPV6_DEST_UNREACH:
a46496ce
MB		 409 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
410 t->parms.name);
f8d20b46
XL		 411 if (code != ICMPV6_PORT_UNREACH)
412 break;
413 return;
c12b395a 414 case ICMPV6_TIME_EXCEED:
415 if (code == ICMPV6_EXC_HOPLIMIT) {
a46496ce
MB		 416 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
417 t->parms.name);
f8d20b46 418 break;
c12b395a 419 }
f8d20b46 420 return;
c12b395a 421 case ICMPV6_PARAMPROB:
422 teli = 0;
423 if (code == ICMPV6_HDR_FIELD)
424 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
425
d1e158e2 426 if (teli && teli == be32_to_cpu(info) - 2) {
c12b395a 427 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
428 if (tel->encap_limit == 0) {
a46496ce
MB		 429 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
430 t->parms.name);
c12b395a 431 }
432 } else {
a46496ce
MB		 433 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
434 t->parms.name);
c12b395a 435 }
f8d20b46 436 return;
c12b395a 437 case ICMPV6_PKT_TOOBIG:
fe1a4ca0 438 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
f8d20b46 439 return;
929fc032
XL		 440 case NDISC_REDIRECT:
441 ip6_redirect(skb, net, skb->dev->ifindex, 0,
442 sock_net_uid(net, NULL));
443 return;
c12b395a 444 }
445
446 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
447 t->err_count++;
448 else
449 t->err_count = 1;
450 t->err_time = jiffies;
c12b395a 451}
452
308edfdf 453static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
c12b395a 454{
455 const struct ipv6hdr *ipv6h;
c12b395a 456 struct ip6_tnl *tunnel;
c12b395a 457
458 ipv6h = ipv6_hdr(skb);
c12b395a 459 tunnel = ip6gre_tunnel_lookup(skb->dev,
308edfdf
TH		 460 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
461 tpi->proto);
c12b395a 462 if (tunnel) {
981542c5 463 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
c12b395a 464
308edfdf
TH		 465 return PACKET_RCVD;
466 }
eccc1bb8 467
308edfdf
TH		 468 return PACKET_REJECT;
469}
eccc1bb8 470
308edfdf
TH		 471static int gre_rcv(struct sk_buff *skb)
472{
473 struct tnl_ptk_info tpi;
474 bool csum_err = false;
475 int hdr_len;
eccc1bb8 476
e582615a 477 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
f132ae7c 478 if (hdr_len < 0)
308edfdf 479 goto drop;
c12b395a 480
308edfdf
TH		 481 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
482 goto drop;
c12b395a 483
308edfdf 484 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
c12b395a 485 return 0;
c12b395a 486
308edfdf 487 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
c12b395a 488drop:
c12b395a 489 kfree_skb(skb);
490 return 0;
491}
492
b05229f4 493static int gre_handle_offloads(struct sk_buff *skb, bool csum)
c12b395a 494{
b05229f4
TH		 495 return iptunnel_handle_offloads(skb,
496 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
c12b395a 497}
498
b05229f4
TH		 499static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
500 struct net_device *dev, __u8 dsfield,
501 struct flowi6 *fl6, int encap_limit,
502 __u32 *pmtu, __be16 proto)
c12b395a 503{
c12b395a 504 struct ip6_tnl *tunnel = netdev_priv(dev);
8aec4959 505 __be16 protocol;
c12b395a 506
507 if (dev->type == ARPHRD_ETHER)
508 IPCB(skb)->flags = 0;
509
b05229f4
TH		 510 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
511 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
512 else
c12b395a 513 fl6->daddr = tunnel->parms.raddr;
c12b395a 514
b05229f4
TH		 515 if (tunnel->parms.o_flags & TUNNEL_SEQ)
516 tunnel->o_seqno++;
c12b395a 517
b05229f4 518 /* Push GRE header. */
8aec4959 519 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
b05229f4
TH		 520 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
521 protocol, tunnel->parms.o_key, htonl(tunnel->o_seqno));
c12b395a 522
b05229f4
TH		 523 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
524 NEXTHDR_GRE);
c12b395a 525}
526
527static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
528{
529 struct ip6_tnl *t = netdev_priv(dev);
530 const struct iphdr *iph = ip_hdr(skb);
531 int encap_limit = -1;
532 struct flowi6 fl6;
533 __u8 dsfield;
534 __u32 mtu;
535 int err;
536
5146d1f1
BH		 537 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
538
c12b395a 539 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
540 encap_limit = t->parms.encap_limit;
541
542 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
c12b395a 543
c12b395a 544 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
0e9a7095
PD		 545 dsfield = ipv4_get_dsfield(iph);
546 else
547 dsfield = ip6_tclass(t->parms.flowinfo);
c12b395a 548 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
549 fl6.flowi6_mark = skb->mark;
0a473b82
CG		 550 else
551 fl6.flowi6_mark = t->parms.fwmark;
c12b395a 552
e2d118a1
LC		 553 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
554
b05229f4
TH		 555 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
556 if (err)
557 return -1;
558
559 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
560 skb->protocol);
c12b395a 561 if (err != 0) {
562 /* XXX: send ICMP error even if DF is not set. */
563 if (err == -EMSGSIZE)
564 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
565 htonl(mtu));
566 return -1;
567 }
568
569 return 0;
570}
571
572static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
573{
574 struct ip6_tnl *t = netdev_priv(dev);
575 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
576 int encap_limit = -1;
577 __u16 offset;
578 struct flowi6 fl6;
579 __u8 dsfield;
580 __u32 mtu;
581 int err;
582
583 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
584 return -1;
585
586 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
21b995a9
ED		 587 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
588 ipv6h = ipv6_hdr(skb);
589
c12b395a 590 if (offset > 0) {
591 struct ipv6_tlv_tnl_enc_lim *tel;
592 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
593 if (tel->encap_limit == 0) {
594 icmpv6_send(skb, ICMPV6_PARAMPROB,
595 ICMPV6_HDR_FIELD, offset + 2);
596 return -1;
597 }
598 encap_limit = tel->encap_limit - 1;
599 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
600 encap_limit = t->parms.encap_limit;
601
602 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
c12b395a 603
c12b395a 604 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
0e9a7095
PD		 605 dsfield = ipv6_get_dsfield(ipv6h);
606 else
607 dsfield = ip6_tclass(t->parms.flowinfo);
608
c12b395a 609 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
3308de2b 610 fl6.flowlabel |= ip6_flowlabel(ipv6h);
c12b395a 611 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
612 fl6.flowi6_mark = skb->mark;
0a473b82
CG		 613 else
614 fl6.flowi6_mark = t->parms.fwmark;
c12b395a 615
e2d118a1
LC		 616 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
617
b05229f4
TH		 618 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
619 return -1;
620
621 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
622 &mtu, skb->protocol);
c12b395a 623 if (err != 0) {
624 if (err == -EMSGSIZE)
625 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
626 return -1;
627 }
628
629 return 0;
630}
631
632/**
633 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
634 * @t: the outgoing tunnel device
635 * @hdr: IPv6 header from the incoming packet
636 *
637 * Description:
638 * Avoid trivial tunneling loop by checking that tunnel exit-point
639 * doesn't match source of incoming packet.
640 *
641 * Return:
642 * 1 if conflict,
643 * 0 else
644 **/
645
646static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
647 const struct ipv6hdr *hdr)
648{
649 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
650}
651
652static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
653{
654 struct ip6_tnl *t = netdev_priv(dev);
655 int encap_limit = -1;
656 struct flowi6 fl6;
657 __u32 mtu;
658 int err;
659
660 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
661 encap_limit = t->parms.encap_limit;
662
663 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
c12b395a 664
b05229f4
TH		 665 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
666 if (err)
667 return err;
668
669 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
c12b395a 670
671 return err;
672}
673
674static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
675 struct net_device *dev)
676{
677 struct ip6_tnl *t = netdev_priv(dev);
678 struct net_device_stats *stats = &t->dev->stats;
679 int ret;
680
d5005140 681 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
41ab3e31 682 goto tx_err;
c12b395a 683
684 switch (skb->protocol) {
685 case htons(ETH_P_IP):
686 ret = ip6gre_xmit_ipv4(skb, dev);
687 break;
688 case htons(ETH_P_IPV6):
689 ret = ip6gre_xmit_ipv6(skb, dev);
690 break;
691 default:
692 ret = ip6gre_xmit_other(skb, dev);
693 break;
694 }
695
696 if (ret < 0)
697 goto tx_err;
698
699 return NETDEV_TX_OK;
700
701tx_err:
702 stats->tx_errors++;
703 stats->tx_dropped++;
704 kfree_skb(skb);
705 return NETDEV_TX_OK;
706}
707
708static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
709{
710 struct net_device *dev = t->dev;
711 struct __ip6_tnl_parm *p = &t->parms;
712 struct flowi6 *fl6 = &t->fl.u.ip6;
db2ec95d 713 int t_hlen;
c12b395a 714
715 if (dev->type != ARPHRD_ETHER) {
716 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
717 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
718 }
719
720 /* Set up flowi template */
721 fl6->saddr = p->laddr;
722 fl6->daddr = p->raddr;
723 fl6->flowi6_oif = p->link;
724 fl6->flowlabel = 0;
252f3f5a 725 fl6->flowi6_proto = IPPROTO_GRE;
c12b395a 726
727 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
728 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
729 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
730 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
731
732 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
733 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
734
735 if (p->flags&IP6_TNL_F_CAP_XMIT &&
736 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
737 dev->flags |= IFF_POINTOPOINT;
738 else
739 dev->flags &= ~IFF_POINTOPOINT;
740
db2ec95d
TH		 741 t->tun_hlen = gre_calc_hlen(t->parms.o_flags);
742
1faf3d9f 743 t->hlen = t->encap_hlen + t->tun_hlen;
db2ec95d
TH		 744
745 t_hlen = t->hlen + sizeof(struct ipv6hdr);
c12b395a 746
747 if (p->flags & IP6_TNL_F_CAP_XMIT) {
748 int strict = (ipv6_addr_type(&p->raddr) &
749 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
750
22f08069 751 struct rt6_info *rt = rt6_lookup(t->net,
c12b395a 752 &p->raddr, &p->laddr,
753 p->link, strict);
754
63159f29 755 if (!rt)
c12b395a 756 return;
757
758 if (rt->dst.dev) {
db2ec95d
TH		 759 dev->hard_header_len = rt->dst.dev->hard_header_len +
760 t_hlen;
c12b395a 761
762 if (set_mtu) {
db2ec95d 763 dev->mtu = rt->dst.dev->mtu - t_hlen;
c12b395a 764 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
765 dev->mtu -= 8;
a9e242ca
AD		 766 if (dev->type == ARPHRD_ETHER)
767 dev->mtu -= ETH_HLEN;
c12b395a 768
769 if (dev->mtu < IPV6_MIN_MTU)
770 dev->mtu = IPV6_MIN_MTU;
771 }
772 }
94e187c0 773 ip6_rt_put(rt);
c12b395a 774 }
c12b395a 775}
776
777static int ip6gre_tnl_change(struct ip6_tnl *t,
778 const struct __ip6_tnl_parm *p, int set_mtu)
779{
780 t->parms.laddr = p->laddr;
781 t->parms.raddr = p->raddr;
782 t->parms.flags = p->flags;
783 t->parms.hop_limit = p->hop_limit;
784 t->parms.encap_limit = p->encap_limit;
785 t->parms.flowinfo = p->flowinfo;
786 t->parms.link = p->link;
787 t->parms.proto = p->proto;
788 t->parms.i_key = p->i_key;
789 t->parms.o_key = p->o_key;
790 t->parms.i_flags = p->i_flags;
791 t->parms.o_flags = p->o_flags;
0a473b82 792 t->parms.fwmark = p->fwmark;
607f725f 793 dst_cache_reset(&t->dst_cache);
c12b395a 794 ip6gre_tnl_link_config(t, set_mtu);
795 return 0;
796}
797
798static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
799 const struct ip6_tnl_parm2 *u)
800{
801 p->laddr = u->laddr;
802 p->raddr = u->raddr;
803 p->flags = u->flags;
804 p->hop_limit = u->hop_limit;
805 p->encap_limit = u->encap_limit;
806 p->flowinfo = u->flowinfo;
807 p->link = u->link;
808 p->i_key = u->i_key;
809 p->o_key = u->o_key;
f41fe3c2
TH		 810 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
811 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
c12b395a 812 memcpy(p->name, u->name, sizeof(u->name));
813}
814
815static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
816 const struct __ip6_tnl_parm *p)
817{
818 u->proto = IPPROTO_GRE;
819 u->laddr = p->laddr;
820 u->raddr = p->raddr;
821 u->flags = p->flags;
822 u->hop_limit = p->hop_limit;
823 u->encap_limit = p->encap_limit;
824 u->flowinfo = p->flowinfo;
825 u->link = p->link;
826 u->i_key = p->i_key;
827 u->o_key = p->o_key;
f41fe3c2
TH		 828 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
829 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
c12b395a 830 memcpy(u->name, p->name, sizeof(u->name));
831}
832
833static int ip6gre_tunnel_ioctl(struct net_device *dev,
834 struct ifreq *ifr, int cmd)
835{
836 int err = 0;
837 struct ip6_tnl_parm2 p;
838 struct __ip6_tnl_parm p1;
22f08069
ND		 839 struct ip6_tnl *t = netdev_priv(dev);
840 struct net *net = t->net;
c12b395a 841 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
842
308edfdf
TH		 843 memset(&p1, 0, sizeof(p1));
844
c12b395a 845 switch (cmd) {
846 case SIOCGETTUNNEL:
c12b395a 847 if (dev == ign->fb_tunnel_dev) {
848 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
849 err = -EFAULT;
850 break;
851 }
852 ip6gre_tnl_parm_from_user(&p1, &p);
853 t = ip6gre_tunnel_locate(net, &p1, 0);
63159f29 854 if (!t)
22f08069 855 t = netdev_priv(dev);
c12b395a 856 }
5dbd5068 857 memset(&p, 0, sizeof(p));
c12b395a 858 ip6gre_tnl_parm_to_user(&p, &t->parms);
859 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
860 err = -EFAULT;
861 break;
862
863 case SIOCADDTUNNEL:
864 case SIOCCHGTUNNEL:
865 err = -EPERM;
af31f412 866 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
c12b395a 867 goto done;
868
869 err = -EFAULT;
870 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
871 goto done;
872
873 err = -EINVAL;
874 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
875 goto done;
876
877 if (!(p.i_flags&GRE_KEY))
878 p.i_key = 0;
879 if (!(p.o_flags&GRE_KEY))
880 p.o_key = 0;
881
882 ip6gre_tnl_parm_from_user(&p1, &p);
883 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
884
885 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
53b24b8f 886 if (t) {
c12b395a 887 if (t->dev != dev) {
888 err = -EEXIST;
889 break;
890 }
891 } else {
892 t = netdev_priv(dev);
893
894 ip6gre_tunnel_unlink(ign, t);
895 synchronize_net();
896 ip6gre_tnl_change(t, &p1, 1);
897 ip6gre_tunnel_link(ign, t);
898 netdev_state_change(dev);
899 }
900 }
901
902 if (t) {
903 err = 0;
904
5dbd5068 905 memset(&p, 0, sizeof(p));
c12b395a 906 ip6gre_tnl_parm_to_user(&p, &t->parms);
907 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
908 err = -EFAULT;
909 } else
910 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
911 break;
912
913 case SIOCDELTUNNEL:
914 err = -EPERM;
af31f412 915 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
c12b395a 916 goto done;
917
918 if (dev == ign->fb_tunnel_dev) {
919 err = -EFAULT;
920 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
921 goto done;
922 err = -ENOENT;
923 ip6gre_tnl_parm_from_user(&p1, &p);
924 t = ip6gre_tunnel_locate(net, &p1, 0);
63159f29 925 if (!t)
c12b395a 926 goto done;
927 err = -EPERM;
928 if (t == netdev_priv(ign->fb_tunnel_dev))
929 goto done;
930 dev = t->dev;
931 }
932 unregister_netdevice(dev);
933 err = 0;
934 break;
935
936 default:
937 err = -EINVAL;
938 }
939
940done:
941 return err;
942}
943
c12b395a 944static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
76cc0d32
XL		 945 unsigned short type, const void *daddr,
946 const void *saddr, unsigned int len)
c12b395a 947{
948 struct ip6_tnl *t = netdev_priv(dev);
76cc0d32
XL		 949 struct ipv6hdr *ipv6h;
950 __be16 *p;
c12b395a 951
76cc0d32
XL		 952 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
953 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
954 t->fl.u.ip6.flowlabel,
955 true, &t->fl.u.ip6));
c12b395a 956 ipv6h->hop_limit = t->parms.hop_limit;
957 ipv6h->nexthdr = NEXTHDR_GRE;
958 ipv6h->saddr = t->parms.laddr;
959 ipv6h->daddr = t->parms.raddr;
960
76cc0d32
XL		 961 p = (__be16 *)(ipv6h + 1);
962 p[0] = t->parms.o_flags;
963 p[1] = htons(type);
c12b395a 964
965 /*
966 * Set the source hardware address.
967 */
968
969 if (saddr)
970 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
971 if (daddr)
972 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
973 if (!ipv6_addr_any(&ipv6h->daddr))
974 return t->hlen;
975
976 return -t->hlen;
977}
978
c12b395a 979static const struct header_ops ip6gre_header_ops = {
980 .create = ip6gre_header,
c12b395a 981};
982
983static const struct net_device_ops ip6gre_netdev_ops = {
984 .ndo_init = ip6gre_tunnel_init,
985 .ndo_uninit = ip6gre_tunnel_uninit,
986 .ndo_start_xmit = ip6gre_tunnel_xmit,
987 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
b05229f4 988 .ndo_change_mtu = ip6_tnl_change_mtu,
f61dd388 989 .ndo_get_stats64 = ip_tunnel_get_stats64,
ecf2c06a 990 .ndo_get_iflink = ip6_tnl_get_iflink,
c12b395a 991};
992
993static void ip6gre_dev_free(struct net_device *dev)
994{
cdf3464e
MKL		 995 struct ip6_tnl *t = netdev_priv(dev);
996
607f725f 997 dst_cache_destroy(&t->dst_cache);
c12b395a 998 free_percpu(dev->tstats);
c12b395a 999}
1000
1001static void ip6gre_tunnel_setup(struct net_device *dev)
1002{
c12b395a 1003 dev->netdev_ops = &ip6gre_netdev_ops;
cf124db5
DM		 1004 dev->needs_free_netdev = true;
1005 dev->priv_destructor = ip6gre_dev_free;
c12b395a 1006
1007 dev->type = ARPHRD_IP6GRE;
b05229f4 1008
c12b395a 1009 dev->flags |= IFF_NOARP;
c12b395a 1010 dev->addr_len = sizeof(struct in6_addr);
02875878 1011 netif_keep_dst(dev);
45ce0fd1
FJ		 1012 /* This perm addr will be used as interface identifier by IPv6 */
1013 dev->addr_assign_type = NET_ADDR_RANDOM;
1014 eth_random_addr(dev->perm_addr);
c12b395a 1015}
1016
a3c119d3 1017static int ip6gre_tunnel_init_common(struct net_device *dev)
c12b395a 1018{
1019 struct ip6_tnl *tunnel;
cdf3464e 1020 int ret;
b05229f4 1021 int t_hlen;
c12b395a 1022
1023 tunnel = netdev_priv(dev);
1024
1025 tunnel->dev = dev;
0bd87628 1026 tunnel->net = dev_net(dev);
c12b395a 1027 strcpy(tunnel->parms.name, dev->name);
1028
a3c119d3
MKL		 1029 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1030 if (!dev->tstats)
1031 return -ENOMEM;
1032
607f725f 1033 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
cdf3464e
MKL		 1034 if (ret) {
1035 free_percpu(dev->tstats);
1036 dev->tstats = NULL;
1037 return ret;
1038 }
1039
b05229f4 1040 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1faf3d9f 1041 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
db2ec95d 1042 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
b05229f4 1043
db2ec95d
TH		 1044 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1045 dev->mtu = ETH_DATA_LEN - t_hlen;
1b227e53
HY		 1046 if (dev->type == ARPHRD_ETHER)
1047 dev->mtu -= ETH_HLEN;
b05229f4
TH		 1048 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1049 dev->mtu -= 8;
1050
a3c119d3
MKL		 1051 return 0;
1052}
1053
1054static int ip6gre_tunnel_init(struct net_device *dev)
1055{
1056 struct ip6_tnl *tunnel;
1057 int ret;
1058
1059 ret = ip6gre_tunnel_init_common(dev);
1060 if (ret)
1061 return ret;
1062
1063 tunnel = netdev_priv(dev);
1064
c12b395a 1065 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1066 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1067
1068 if (ipv6_addr_any(&tunnel->parms.raddr))
1069 dev->header_ops = &ip6gre_header_ops;
1070
c12b395a 1071 return 0;
1072}
1073
1074static void ip6gre_fb_tunnel_init(struct net_device *dev)
1075{
1076 struct ip6_tnl *tunnel = netdev_priv(dev);
1077
1078 tunnel->dev = dev;
0bd87628 1079 tunnel->net = dev_net(dev);
c12b395a 1080 strcpy(tunnel->parms.name, dev->name);
1081
1082 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1083
1084 dev_hold(dev);
1085}
1086
1087
1088static struct inet6_protocol ip6gre_protocol __read_mostly = {
308edfdf 1089 .handler = gre_rcv,
c12b395a 1090 .err_handler = ip6gre_err,
1091 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1092};
1093
22f08069 1094static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
c12b395a 1095{
22f08069
ND		 1096 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1097 struct net_device *dev, *aux;
c12b395a 1098 int prio;
1099
22f08069
ND		 1100 for_each_netdev_safe(net, dev, aux)
1101 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1102 dev->rtnl_link_ops == &ip6gre_tap_ops)
1103 unregister_netdevice_queue(dev, head);
1104
c12b395a 1105 for (prio = 0; prio < 4; prio++) {
1106 int h;
e87a8f24 1107 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
c12b395a 1108 struct ip6_tnl *t;
1109
1110 t = rtnl_dereference(ign->tunnels[prio][h]);
1111
53b24b8f 1112 while (t) {
22f08069
ND		 1113 /* If dev is in the same netns, it has already
1114 * been added to the list by the previous loop.
1115 */
1116 if (!net_eq(dev_net(t->dev), net))
1117 unregister_netdevice_queue(t->dev,
1118 head);
c12b395a 1119 t = rtnl_dereference(t->next);
1120 }
1121 }
1122 }
1123}
1124
1125static int __net_init ip6gre_init_net(struct net *net)
1126{
1127 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1128 int err;
1129
1130 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
c835a677
TG		 1131 NET_NAME_UNKNOWN,
1132 ip6gre_tunnel_setup);
c12b395a 1133 if (!ign->fb_tunnel_dev) {
1134 err = -ENOMEM;
1135 goto err_alloc_dev;
1136 }
1137 dev_net_set(ign->fb_tunnel_dev, net);
22f08069
ND		 1138 /* FB netdevice is special: we have one, and only one per netns.
1139 * Allowing to move it to another netns is clearly unsafe.
1140 */
1141 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1142
c12b395a 1143
1144 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1145 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1146
1147 err = register_netdev(ign->fb_tunnel_dev);
1148 if (err)
1149 goto err_reg_dev;
1150
1151 rcu_assign_pointer(ign->tunnels_wc[0],
1152 netdev_priv(ign->fb_tunnel_dev));
1153 return 0;
1154
1155err_reg_dev:
cf124db5 1156 free_netdev(ign->fb_tunnel_dev);
c12b395a 1157err_alloc_dev:
1158 return err;
1159}
1160
bb401cae 1161static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
c12b395a 1162{
bb401cae 1163 struct net *net;
c12b395a 1164 LIST_HEAD(list);
1165
c12b395a 1166 rtnl_lock();
bb401cae
ED		 1167 list_for_each_entry(net, net_list, exit_list)
1168 ip6gre_destroy_tunnels(net, &list);
c12b395a 1169 unregister_netdevice_many(&list);
1170 rtnl_unlock();
1171}
1172
1173static struct pernet_operations ip6gre_net_ops = {
1174 .init = ip6gre_init_net,
bb401cae 1175 .exit_batch = ip6gre_exit_batch_net,
c12b395a 1176 .id = &ip6gre_net_id,
1177 .size = sizeof(struct ip6gre_net),
1178};
1179
a8b8a889
MS		 1180static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1181 struct netlink_ext_ack *extack)
c12b395a 1182{
1183 __be16 flags;
1184
1185 if (!data)
1186 return 0;
1187
1188 flags = 0;
1189 if (data[IFLA_GRE_IFLAGS])
1190 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1191 if (data[IFLA_GRE_OFLAGS])
1192 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1193 if (flags & (GRE_VERSION|GRE_ROUTING))
1194 return -EINVAL;
1195
1196 return 0;
1197}
1198
a8b8a889
MS		 1199static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1200 struct netlink_ext_ack *extack)
c12b395a 1201{
1202 struct in6_addr daddr;
1203
1204 if (tb[IFLA_ADDRESS]) {
1205 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1206 return -EINVAL;
1207 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1208 return -EADDRNOTAVAIL;
1209 }
1210
1211 if (!data)
1212 goto out;
1213
1214 if (data[IFLA_GRE_REMOTE]) {
67b61f6c 1215 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
c12b395a 1216 if (ipv6_addr_any(&daddr))
1217 return -EINVAL;
1218 }
1219
1220out:
a8b8a889 1221 return ip6gre_tunnel_validate(tb, data, extack);
c12b395a 1222}
1223
1224
1225static void ip6gre_netlink_parms(struct nlattr *data[],
1226 struct __ip6_tnl_parm *parms)
1227{
1228 memset(parms, 0, sizeof(*parms));
1229
1230 if (!data)
1231 return;
1232
1233 if (data[IFLA_GRE_LINK])
1234 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1235
1236 if (data[IFLA_GRE_IFLAGS])
f41fe3c2
TH		 1237 parms->i_flags = gre_flags_to_tnl_flags(
1238 nla_get_be16(data[IFLA_GRE_IFLAGS]));
c12b395a 1239
1240 if (data[IFLA_GRE_OFLAGS])
f41fe3c2
TH		 1241 parms->o_flags = gre_flags_to_tnl_flags(
1242 nla_get_be16(data[IFLA_GRE_OFLAGS]));
c12b395a 1243
1244 if (data[IFLA_GRE_IKEY])
1245 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1246
1247 if (data[IFLA_GRE_OKEY])
1248 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1249
1250 if (data[IFLA_GRE_LOCAL])
67b61f6c 1251 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
c12b395a 1252
1253 if (data[IFLA_GRE_REMOTE])
67b61f6c 1254 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
c12b395a 1255
1256 if (data[IFLA_GRE_TTL])
1257 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1258
1259 if (data[IFLA_GRE_ENCAP_LIMIT])
1260 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1261
1262 if (data[IFLA_GRE_FLOWINFO])
c2675de4 1263 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
c12b395a 1264
1265 if (data[IFLA_GRE_FLAGS])
1266 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
0a473b82
CG		 1267
1268 if (data[IFLA_GRE_FWMARK])
1269 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
c12b395a 1270}
1271
1272static int ip6gre_tap_init(struct net_device *dev)
1273{
1274 struct ip6_tnl *tunnel;
a3c119d3 1275 int ret;
c12b395a 1276
a3c119d3
MKL		 1277 ret = ip6gre_tunnel_init_common(dev);
1278 if (ret)
1279 return ret;
c12b395a 1280
0a46baaf
SC		 1281 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1282
a3c119d3 1283 tunnel = netdev_priv(dev);
c12b395a 1284
1285 ip6gre_tnl_link_config(tunnel, 1);
1286
c12b395a 1287 return 0;
1288}
1289
1290static const struct net_device_ops ip6gre_tap_netdev_ops = {
1291 .ndo_init = ip6gre_tap_init,
1292 .ndo_uninit = ip6gre_tunnel_uninit,
1293 .ndo_start_xmit = ip6gre_tunnel_xmit,
1294 .ndo_set_mac_address = eth_mac_addr,
1295 .ndo_validate_addr = eth_validate_addr,
b05229f4 1296 .ndo_change_mtu = ip6_tnl_change_mtu,
f61dd388 1297 .ndo_get_stats64 = ip_tunnel_get_stats64,
ecf2c06a 1298 .ndo_get_iflink = ip6_tnl_get_iflink,
c12b395a 1299};
1300
ac4eb009
AD		 1301#define GRE6_FEATURES (NETIF_F_SG | \
1302 NETIF_F_FRAGLIST | \
1303 NETIF_F_HIGHDMA | \
1304 NETIF_F_HW_CSUM)
1305
c12b395a 1306static void ip6gre_tap_setup(struct net_device *dev)
1307{
1308
1309 ether_setup(dev);
1310
2c52129a 1311 dev->max_mtu = 0;
c12b395a 1312 dev->netdev_ops = &ip6gre_tap_netdev_ops;
cf124db5
DM		 1313 dev->needs_free_netdev = true;
1314 dev->priv_destructor = ip6gre_dev_free;
c12b395a 1315
c12b395a 1316 dev->features |= NETIF_F_NETNS_LOCAL;
d13b161c 1317 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
0a46baaf 1318 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2d40557c 1319 netif_keep_dst(dev);
c12b395a 1320}
1321
1faf3d9f
TH		 1322static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1323 struct ip_tunnel_encap *ipencap)
1324{
1325 bool ret = false;
1326
1327 memset(ipencap, 0, sizeof(*ipencap));
1328
1329 if (!data)
1330 return ret;
1331
1332 if (data[IFLA_GRE_ENCAP_TYPE]) {
1333 ret = true;
1334 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1335 }
1336
1337 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1338 ret = true;
1339 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1340 }
1341
1342 if (data[IFLA_GRE_ENCAP_SPORT]) {
1343 ret = true;
1344 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1345 }
1346
1347 if (data[IFLA_GRE_ENCAP_DPORT]) {
1348 ret = true;
1349 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1350 }
1351
1352 return ret;
1353}
1354
c12b395a 1355static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
7a3f4a18
MS		 1356 struct nlattr *tb[], struct nlattr *data[],
1357 struct netlink_ext_ack *extack)
c12b395a 1358{
1359 struct ip6_tnl *nt;
1360 struct net *net = dev_net(dev);
1361 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1faf3d9f 1362 struct ip_tunnel_encap ipencap;
c12b395a 1363 int err;
1364
1365 nt = netdev_priv(dev);
1faf3d9f
TH		 1366
1367 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1368 int err = ip6_tnl_encap_setup(nt, &ipencap);
1369
1370 if (err < 0)
1371 return err;
1372 }
1373
c12b395a 1374 ip6gre_netlink_parms(data, &nt->parms);
1375
1376 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1377 return -EEXIST;
1378
1379 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1380 eth_hw_addr_random(dev);
1381
1382 nt->dev = dev;
0bd87628 1383 nt->net = dev_net(dev);
c12b395a 1384 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1385
ac4eb009
AD		 1386 dev->features |= GRE6_FEATURES;
1387 dev->hw_features |= GRE6_FEATURES;
1388
b45bd1d7 1389 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
6a553681
AD		 1390 /* TCP offload with GRE SEQ is not supported, nor
1391 * can we support 2 levels of outer headers requiring
1392 * an update.
3a80e1fa 1393 */
6a553681
AD		 1394 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1395 (nt->encap.type == TUNNEL_ENCAP_NONE)) {
1396 dev->features |= NETIF_F_GSO_SOFTWARE;
1397 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1398 }
3a80e1fa
AD		 1399
1400 /* Can use a lockless transmit, unless we generate
1401 * output sequences
1402 */
c12b395a 1403 dev->features |= NETIF_F_LLTX;
3a80e1fa 1404 }
c12b395a 1405
1406 err = register_netdevice(dev);
1407 if (err)
1408 goto out;
1409
1410 dev_hold(dev);
1411 ip6gre_tunnel_link(ign, nt);
1412
1413out:
1414 return err;
1415}
1416
1417static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
ad744b22
MS		 1418 struct nlattr *data[],
1419 struct netlink_ext_ack *extack)
c12b395a 1420{
22f08069
ND		 1421 struct ip6_tnl *t, *nt = netdev_priv(dev);
1422 struct net *net = nt->net;
c12b395a 1423 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1424 struct __ip6_tnl_parm p;
1faf3d9f 1425 struct ip_tunnel_encap ipencap;
c12b395a 1426
1427 if (dev == ign->fb_tunnel_dev)
1428 return -EINVAL;
1429
1faf3d9f
TH		 1430 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1431 int err = ip6_tnl_encap_setup(nt, &ipencap);
1432
1433 if (err < 0)
1434 return err;
1435 }
1436
c12b395a 1437 ip6gre_netlink_parms(data, &p);
1438
1439 t = ip6gre_tunnel_locate(net, &p, 0);
1440
1441 if (t) {
1442 if (t->dev != dev)
1443 return -EEXIST;
1444 } else {
1445 t = nt;
c12b395a 1446 }
1447
6a61d4db
ND		 1448 ip6gre_tunnel_unlink(ign, t);
1449 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1450 ip6gre_tunnel_link(ign, t);
c12b395a 1451 return 0;
1452}
1453
54d63f78
ND		 1454static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
1455{
1456 struct net *net = dev_net(dev);
1457 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1458
1459 if (dev != ign->fb_tunnel_dev)
1460 unregister_netdevice_queue(dev, head);
1461}
1462
c12b395a 1463static size_t ip6gre_get_size(const struct net_device *dev)
1464{
1465 return
1466 /* IFLA_GRE_LINK */
1467 nla_total_size(4) +
1468 /* IFLA_GRE_IFLAGS */
1469 nla_total_size(2) +
1470 /* IFLA_GRE_OFLAGS */
1471 nla_total_size(2) +
1472 /* IFLA_GRE_IKEY */
1473 nla_total_size(4) +
1474 /* IFLA_GRE_OKEY */
1475 nla_total_size(4) +
1476 /* IFLA_GRE_LOCAL */
a3754133 1477 nla_total_size(sizeof(struct in6_addr)) +
c12b395a 1478 /* IFLA_GRE_REMOTE */
a3754133 1479 nla_total_size(sizeof(struct in6_addr)) +
c12b395a 1480 /* IFLA_GRE_TTL */
1481 nla_total_size(1) +
c12b395a 1482 /* IFLA_GRE_ENCAP_LIMIT */
1483 nla_total_size(1) +
1484 /* IFLA_GRE_FLOWINFO */
1485 nla_total_size(4) +
1486 /* IFLA_GRE_FLAGS */
1487 nla_total_size(4) +
1faf3d9f
TH		 1488 /* IFLA_GRE_ENCAP_TYPE */
1489 nla_total_size(2) +
1490 /* IFLA_GRE_ENCAP_FLAGS */
1491 nla_total_size(2) +
1492 /* IFLA_GRE_ENCAP_SPORT */
1493 nla_total_size(2) +
1494 /* IFLA_GRE_ENCAP_DPORT */
1495 nla_total_size(2) +
0a473b82
CG		 1496 /* IFLA_GRE_FWMARK */
1497 nla_total_size(4) +
c12b395a 1498 0;
1499}
1500
1501static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1502{
1503 struct ip6_tnl *t = netdev_priv(dev);
1504 struct __ip6_tnl_parm *p = &t->parms;
1505
1506 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
f41fe3c2
TH		 1507 nla_put_be16(skb, IFLA_GRE_IFLAGS,
1508 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
1509 nla_put_be16(skb, IFLA_GRE_OFLAGS,
1510 gre_tnl_flags_to_gre_flags(p->o_flags)) ||
c12b395a 1511 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1512 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
930345ea
JB		 1513 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
1514 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
c12b395a 1515 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
c12b395a 1516 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1517 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
0a473b82
CG		 1518 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
1519 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
c12b395a 1520 goto nla_put_failure;
1faf3d9f
TH		 1521
1522 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
1523 t->encap.type) ||
1524 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
1525 t->encap.sport) ||
1526 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
1527 t->encap.dport) ||
1528 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
1529 t->encap.flags))
1530 goto nla_put_failure;
1531
c12b395a 1532 return 0;
1533
1534nla_put_failure:
1535 return -EMSGSIZE;
1536}
1537
1538static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1539 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1540 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1541 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1542 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1543 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1544 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1545 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1546 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1547 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1548 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1549 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1faf3d9f
TH		 1550 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
1551 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
1552 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
1553 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
0a473b82 1554 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
c12b395a 1555};
1556
1557static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1558 .kind = "ip6gre",
1559 .maxtype = IFLA_GRE_MAX,
1560 .policy = ip6gre_policy,
1561 .priv_size = sizeof(struct ip6_tnl),
1562 .setup = ip6gre_tunnel_setup,
1563 .validate = ip6gre_tunnel_validate,
1564 .newlink = ip6gre_newlink,
1565 .changelink = ip6gre_changelink,
54d63f78 1566 .dellink = ip6gre_dellink,
c12b395a 1567 .get_size = ip6gre_get_size,
1568 .fill_info = ip6gre_fill_info,
1728d4fa 1569 .get_link_net = ip6_tnl_get_link_net,
c12b395a 1570};
1571
1572static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1573 .kind = "ip6gretap",
1574 .maxtype = IFLA_GRE_MAX,
1575 .policy = ip6gre_policy,
1576 .priv_size = sizeof(struct ip6_tnl),
1577 .setup = ip6gre_tap_setup,
1578 .validate = ip6gre_tap_validate,
1579 .newlink = ip6gre_newlink,
1580 .changelink = ip6gre_changelink,
1581 .get_size = ip6gre_get_size,
1582 .fill_info = ip6gre_fill_info,
3390e397 1583 .get_link_net = ip6_tnl_get_link_net,
c12b395a 1584};
1585
1586/*
1587 * And now the modules code and kernel interface.
1588 */
1589
1590static int __init ip6gre_init(void)
1591{
1592 int err;
1593
1594 pr_info("GRE over IPv6 tunneling driver\n");
1595
1596 err = register_pernet_device(&ip6gre_net_ops);
1597 if (err < 0)
1598 return err;
1599
1600 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1601 if (err < 0) {
1602 pr_info("%s: can't add protocol\n", __func__);
1603 goto add_proto_failed;
1604 }
1605
1606 err = rtnl_link_register(&ip6gre_link_ops);
1607 if (err < 0)
1608 goto rtnl_link_failed;
1609
1610 err = rtnl_link_register(&ip6gre_tap_ops);
1611 if (err < 0)
1612 goto tap_ops_failed;
1613
1614out:
1615 return err;
1616
1617tap_ops_failed:
1618 rtnl_link_unregister(&ip6gre_link_ops);
1619rtnl_link_failed:
1620 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1621add_proto_failed:
1622 unregister_pernet_device(&ip6gre_net_ops);
1623 goto out;
1624}
1625
1626static void __exit ip6gre_fini(void)
1627{
1628 rtnl_link_unregister(&ip6gre_tap_ops);
1629 rtnl_link_unregister(&ip6gre_link_ops);
1630 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1631 unregister_pernet_device(&ip6gre_net_ops);
1632}
1633
1634module_init(ip6gre_init);
1635module_exit(ip6gre_fini);
1636MODULE_LICENSE("GPL");
1637MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1638MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1639MODULE_ALIAS_RTNL_LINK("ip6gre");
5a4ee9a9 1640MODULE_ALIAS_RTNL_LINK("ip6gretap");
c12b395a 1641MODULE_ALIAS_NETDEV("ip6gre0");
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