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[mirror_ubuntu-artful-kernel.git] / net / ipv6 / ip6_gre.c
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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{
7892032c
ED		 372 const struct gre_base_hdr *greh;
373 const struct ipv6hdr *ipv6h;
374 int grehlen = sizeof(*greh);
c12b395a 375 struct ip6_tnl *t;
7892032c 376 int key_off = 0;
c12b395a 377 __be16 flags;
7892032c 378 __be32 key;
c12b395a 379
7892032c
ED		 380 if (!pskb_may_pull(skb, offset + grehlen))
381 return;
382 greh = (const struct gre_base_hdr *)(skb->data + offset);
383 flags = greh->flags;
384 if (flags & (GRE_VERSION | GRE_ROUTING))
385 return;
386 if (flags & GRE_CSUM)
387 grehlen += 4;
388 if (flags & GRE_KEY) {
389 key_off = grehlen + offset;
390 grehlen += 4;
c12b395a 391 }
392
7892032c 393 if (!pskb_may_pull(skb, offset + grehlen))
c12b395a 394 return;
b87fb39e 395 ipv6h = (const struct ipv6hdr *)skb->data;
7892032c
ED		 396 greh = (const struct gre_base_hdr *)(skb->data + offset);
397 key = key_off ? *(__be32 *)(skb->data + key_off) : 0;
c12b395a 398
c12b395a 399 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
7892032c 400 key, greh->protocol);
63159f29 401 if (!t)
0c5794a6 402 return;
c12b395a 403
404 switch (type) {
405 __u32 teli;
406 struct ipv6_tlv_tnl_enc_lim *tel;
407 __u32 mtu;
408 case ICMPV6_DEST_UNREACH:
a46496ce
MB		 409 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
410 t->parms.name);
c12b395a 411 break;
412 case ICMPV6_TIME_EXCEED:
413 if (code == ICMPV6_EXC_HOPLIMIT) {
a46496ce
MB		 414 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
415 t->parms.name);
c12b395a 416 }
417 break;
418 case ICMPV6_PARAMPROB:
419 teli = 0;
420 if (code == ICMPV6_HDR_FIELD)
421 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
422
d1e158e2 423 if (teli && teli == be32_to_cpu(info) - 2) {
c12b395a 424 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
425 if (tel->encap_limit == 0) {
a46496ce
MB		 426 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
427 t->parms.name);
c12b395a 428 }
429 } else {
a46496ce
MB		 430 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
431 t->parms.name);
c12b395a 432 }
433 break;
434 case ICMPV6_PKT_TOOBIG:
3d4c55ad
XL		 435 mtu = be32_to_cpu(info) - offset - t->tun_hlen;
436 if (t->dev->type == ARPHRD_ETHER)
437 mtu -= ETH_HLEN;
c12b395a 438 if (mtu < IPV6_MIN_MTU)
439 mtu = IPV6_MIN_MTU;
440 t->dev->mtu = mtu;
441 break;
442 }
443
444 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
445 t->err_count++;
446 else
447 t->err_count = 1;
448 t->err_time = jiffies;
c12b395a 449}
450
308edfdf 451static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
c12b395a 452{
453 const struct ipv6hdr *ipv6h;
c12b395a 454 struct ip6_tnl *tunnel;
c12b395a 455
456 ipv6h = ipv6_hdr(skb);
c12b395a 457 tunnel = ip6gre_tunnel_lookup(skb->dev,
308edfdf
TH		 458 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
459 tpi->proto);
c12b395a 460 if (tunnel) {
308edfdf 461 ip6_tnl_rcv(tunnel, skb, tpi, NULL, false);
c12b395a 462
308edfdf
TH		 463 return PACKET_RCVD;
464 }
eccc1bb8 465
308edfdf
TH		 466 return PACKET_REJECT;
467}
eccc1bb8 468
308edfdf
TH		 469static int gre_rcv(struct sk_buff *skb)
470{
471 struct tnl_ptk_info tpi;
472 bool csum_err = false;
473 int hdr_len;
eccc1bb8 474
e582615a 475 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
f132ae7c 476 if (hdr_len < 0)
308edfdf 477 goto drop;
c12b395a 478
308edfdf
TH		 479 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
480 goto drop;
c12b395a 481
308edfdf 482 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
c12b395a 483 return 0;
c12b395a 484
308edfdf 485 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
c12b395a 486drop:
c12b395a 487 kfree_skb(skb);
488 return 0;
489}
490
b05229f4 491static int gre_handle_offloads(struct sk_buff *skb, bool csum)
c12b395a 492{
b05229f4
TH		 493 return iptunnel_handle_offloads(skb,
494 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
c12b395a 495}
496
b05229f4
TH		 497static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
498 struct net_device *dev, __u8 dsfield,
499 struct flowi6 *fl6, int encap_limit,
500 __u32 *pmtu, __be16 proto)
c12b395a 501{
c12b395a 502 struct ip6_tnl *tunnel = netdev_priv(dev);
b05229f4
TH		 503 __be16 protocol = (dev->type == ARPHRD_ETHER) ?
504 htons(ETH_P_TEB) : proto;
c12b395a 505
506 if (dev->type == ARPHRD_ETHER)
507 IPCB(skb)->flags = 0;
508
b05229f4
TH		 509 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
510 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
511 else
c12b395a 512 fl6->daddr = tunnel->parms.raddr;
c12b395a 513
b05229f4
TH		 514 if (tunnel->parms.o_flags & TUNNEL_SEQ)
515 tunnel->o_seqno++;
c12b395a 516
b05229f4
TH		 517 /* Push GRE header. */
518 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
519 protocol, tunnel->parms.o_key, htonl(tunnel->o_seqno));
c12b395a 520
b05229f4
TH		 521 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
522 NEXTHDR_GRE);
c12b395a 523}
524
525static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
526{
527 struct ip6_tnl *t = netdev_priv(dev);
528 const struct iphdr *iph = ip_hdr(skb);
529 int encap_limit = -1;
530 struct flowi6 fl6;
531 __u8 dsfield;
532 __u32 mtu;
533 int err;
534
5146d1f1
BH		 535 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
536
c12b395a 537 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
538 encap_limit = t->parms.encap_limit;
539
540 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
c12b395a 541
c12b395a 542 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
0e9a7095
PD		 543 dsfield = ipv4_get_dsfield(iph);
544 else
545 dsfield = ip6_tclass(t->parms.flowinfo);
c12b395a 546 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
547 fl6.flowi6_mark = skb->mark;
0a473b82
CG		 548 else
549 fl6.flowi6_mark = t->parms.fwmark;
c12b395a 550
e2d118a1
LC		 551 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
552
b05229f4
TH		 553 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
554 if (err)
555 return -1;
556
557 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
558 skb->protocol);
c12b395a 559 if (err != 0) {
560 /* XXX: send ICMP error even if DF is not set. */
561 if (err == -EMSGSIZE)
562 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
563 htonl(mtu));
564 return -1;
565 }
566
567 return 0;
568}
569
570static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
571{
572 struct ip6_tnl *t = netdev_priv(dev);
573 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
574 int encap_limit = -1;
575 __u16 offset;
576 struct flowi6 fl6;
577 __u8 dsfield;
578 __u32 mtu;
579 int err;
580
581 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
582 return -1;
583
584 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
21b995a9
ED		 585 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
586 ipv6h = ipv6_hdr(skb);
587
c12b395a 588 if (offset > 0) {
589 struct ipv6_tlv_tnl_enc_lim *tel;
590 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
591 if (tel->encap_limit == 0) {
592 icmpv6_send(skb, ICMPV6_PARAMPROB,
593 ICMPV6_HDR_FIELD, offset + 2);
594 return -1;
595 }
596 encap_limit = tel->encap_limit - 1;
597 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
598 encap_limit = t->parms.encap_limit;
599
600 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
c12b395a 601
c12b395a 602 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
0e9a7095
PD		 603 dsfield = ipv6_get_dsfield(ipv6h);
604 else
605 dsfield = ip6_tclass(t->parms.flowinfo);
606
c12b395a 607 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
3308de2b 608 fl6.flowlabel |= ip6_flowlabel(ipv6h);
c12b395a 609 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
610 fl6.flowi6_mark = skb->mark;
0a473b82
CG		 611 else
612 fl6.flowi6_mark = t->parms.fwmark;
c12b395a 613
e2d118a1
LC		 614 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
615
b05229f4
TH		 616 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
617 return -1;
618
619 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
620 &mtu, skb->protocol);
c12b395a 621 if (err != 0) {
622 if (err == -EMSGSIZE)
623 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
624 return -1;
625 }
626
627 return 0;
628}
629
630/**
631 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
632 * @t: the outgoing tunnel device
633 * @hdr: IPv6 header from the incoming packet
634 *
635 * Description:
636 * Avoid trivial tunneling loop by checking that tunnel exit-point
637 * doesn't match source of incoming packet.
638 *
639 * Return:
640 * 1 if conflict,
641 * 0 else
642 **/
643
644static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
645 const struct ipv6hdr *hdr)
646{
647 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
648}
649
650static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
651{
652 struct ip6_tnl *t = netdev_priv(dev);
653 int encap_limit = -1;
654 struct flowi6 fl6;
655 __u32 mtu;
656 int err;
657
658 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
659 encap_limit = t->parms.encap_limit;
660
661 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
c12b395a 662
b05229f4
TH		 663 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
664 if (err)
665 return err;
666
667 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
c12b395a 668
669 return err;
670}
671
672static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
673 struct net_device *dev)
674{
675 struct ip6_tnl *t = netdev_priv(dev);
676 struct net_device_stats *stats = &t->dev->stats;
677 int ret;
678
d5005140 679 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
41ab3e31 680 goto tx_err;
c12b395a 681
682 switch (skb->protocol) {
683 case htons(ETH_P_IP):
684 ret = ip6gre_xmit_ipv4(skb, dev);
685 break;
686 case htons(ETH_P_IPV6):
687 ret = ip6gre_xmit_ipv6(skb, dev);
688 break;
689 default:
690 ret = ip6gre_xmit_other(skb, dev);
691 break;
692 }
693
694 if (ret < 0)
695 goto tx_err;
696
697 return NETDEV_TX_OK;
698
699tx_err:
700 stats->tx_errors++;
701 stats->tx_dropped++;
702 kfree_skb(skb);
703 return NETDEV_TX_OK;
704}
705
706static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
707{
708 struct net_device *dev = t->dev;
709 struct __ip6_tnl_parm *p = &t->parms;
710 struct flowi6 *fl6 = &t->fl.u.ip6;
db2ec95d 711 int t_hlen;
c12b395a 712
713 if (dev->type != ARPHRD_ETHER) {
714 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
715 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
716 }
717
718 /* Set up flowi template */
719 fl6->saddr = p->laddr;
720 fl6->daddr = p->raddr;
721 fl6->flowi6_oif = p->link;
722 fl6->flowlabel = 0;
252f3f5a 723 fl6->flowi6_proto = IPPROTO_GRE;
c12b395a 724
725 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
726 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
727 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
728 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
729
730 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
731 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
732
733 if (p->flags&IP6_TNL_F_CAP_XMIT &&
734 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
735 dev->flags |= IFF_POINTOPOINT;
736 else
737 dev->flags &= ~IFF_POINTOPOINT;
738
db2ec95d
TH		 739 t->tun_hlen = gre_calc_hlen(t->parms.o_flags);
740
1faf3d9f 741 t->hlen = t->encap_hlen + t->tun_hlen;
db2ec95d
TH		 742
743 t_hlen = t->hlen + sizeof(struct ipv6hdr);
c12b395a 744
745 if (p->flags & IP6_TNL_F_CAP_XMIT) {
746 int strict = (ipv6_addr_type(&p->raddr) &
747 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
748
22f08069 749 struct rt6_info *rt = rt6_lookup(t->net,
c12b395a 750 &p->raddr, &p->laddr,
751 p->link, strict);
752
63159f29 753 if (!rt)
c12b395a 754 return;
755
756 if (rt->dst.dev) {
db2ec95d
TH		 757 dev->hard_header_len = rt->dst.dev->hard_header_len +
758 t_hlen;
c12b395a 759
760 if (set_mtu) {
db2ec95d 761 dev->mtu = rt->dst.dev->mtu - t_hlen;
c12b395a 762 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
763 dev->mtu -= 8;
a9e242ca
AD		 764 if (dev->type == ARPHRD_ETHER)
765 dev->mtu -= ETH_HLEN;
c12b395a 766
767 if (dev->mtu < IPV6_MIN_MTU)
768 dev->mtu = IPV6_MIN_MTU;
769 }
770 }
94e187c0 771 ip6_rt_put(rt);
c12b395a 772 }
c12b395a 773}
774
775static int ip6gre_tnl_change(struct ip6_tnl *t,
776 const struct __ip6_tnl_parm *p, int set_mtu)
777{
778 t->parms.laddr = p->laddr;
779 t->parms.raddr = p->raddr;
780 t->parms.flags = p->flags;
781 t->parms.hop_limit = p->hop_limit;
782 t->parms.encap_limit = p->encap_limit;
783 t->parms.flowinfo = p->flowinfo;
784 t->parms.link = p->link;
785 t->parms.proto = p->proto;
786 t->parms.i_key = p->i_key;
787 t->parms.o_key = p->o_key;
788 t->parms.i_flags = p->i_flags;
789 t->parms.o_flags = p->o_flags;
0a473b82 790 t->parms.fwmark = p->fwmark;
607f725f 791 dst_cache_reset(&t->dst_cache);
c12b395a 792 ip6gre_tnl_link_config(t, set_mtu);
793 return 0;
794}
795
796static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
797 const struct ip6_tnl_parm2 *u)
798{
799 p->laddr = u->laddr;
800 p->raddr = u->raddr;
801 p->flags = u->flags;
802 p->hop_limit = u->hop_limit;
803 p->encap_limit = u->encap_limit;
804 p->flowinfo = u->flowinfo;
805 p->link = u->link;
806 p->i_key = u->i_key;
807 p->o_key = u->o_key;
f41fe3c2
TH		 808 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
809 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
c12b395a 810 memcpy(p->name, u->name, sizeof(u->name));
811}
812
813static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
814 const struct __ip6_tnl_parm *p)
815{
816 u->proto = IPPROTO_GRE;
817 u->laddr = p->laddr;
818 u->raddr = p->raddr;
819 u->flags = p->flags;
820 u->hop_limit = p->hop_limit;
821 u->encap_limit = p->encap_limit;
822 u->flowinfo = p->flowinfo;
823 u->link = p->link;
824 u->i_key = p->i_key;
825 u->o_key = p->o_key;
f41fe3c2
TH		 826 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
827 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
c12b395a 828 memcpy(u->name, p->name, sizeof(u->name));
829}
830
831static int ip6gre_tunnel_ioctl(struct net_device *dev,
832 struct ifreq *ifr, int cmd)
833{
834 int err = 0;
835 struct ip6_tnl_parm2 p;
836 struct __ip6_tnl_parm p1;
22f08069
ND		 837 struct ip6_tnl *t = netdev_priv(dev);
838 struct net *net = t->net;
c12b395a 839 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
840
308edfdf
TH		 841 memset(&p1, 0, sizeof(p1));
842
c12b395a 843 switch (cmd) {
844 case SIOCGETTUNNEL:
c12b395a 845 if (dev == ign->fb_tunnel_dev) {
846 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
847 err = -EFAULT;
848 break;
849 }
850 ip6gre_tnl_parm_from_user(&p1, &p);
851 t = ip6gre_tunnel_locate(net, &p1, 0);
63159f29 852 if (!t)
22f08069 853 t = netdev_priv(dev);
c12b395a 854 }
5dbd5068 855 memset(&p, 0, sizeof(p));
c12b395a 856 ip6gre_tnl_parm_to_user(&p, &t->parms);
857 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
858 err = -EFAULT;
859 break;
860
861 case SIOCADDTUNNEL:
862 case SIOCCHGTUNNEL:
863 err = -EPERM;
af31f412 864 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
c12b395a 865 goto done;
866
867 err = -EFAULT;
868 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
869 goto done;
870
871 err = -EINVAL;
872 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
873 goto done;
874
875 if (!(p.i_flags&GRE_KEY))
876 p.i_key = 0;
877 if (!(p.o_flags&GRE_KEY))
878 p.o_key = 0;
879
880 ip6gre_tnl_parm_from_user(&p1, &p);
881 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
882
883 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
53b24b8f 884 if (t) {
c12b395a 885 if (t->dev != dev) {
886 err = -EEXIST;
887 break;
888 }
889 } else {
890 t = netdev_priv(dev);
891
892 ip6gre_tunnel_unlink(ign, t);
893 synchronize_net();
894 ip6gre_tnl_change(t, &p1, 1);
895 ip6gre_tunnel_link(ign, t);
896 netdev_state_change(dev);
897 }
898 }
899
900 if (t) {
901 err = 0;
902
5dbd5068 903 memset(&p, 0, sizeof(p));
c12b395a 904 ip6gre_tnl_parm_to_user(&p, &t->parms);
905 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
906 err = -EFAULT;
907 } else
908 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
909 break;
910
911 case SIOCDELTUNNEL:
912 err = -EPERM;
af31f412 913 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
c12b395a 914 goto done;
915
916 if (dev == ign->fb_tunnel_dev) {
917 err = -EFAULT;
918 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
919 goto done;
920 err = -ENOENT;
921 ip6gre_tnl_parm_from_user(&p1, &p);
922 t = ip6gre_tunnel_locate(net, &p1, 0);
63159f29 923 if (!t)
c12b395a 924 goto done;
925 err = -EPERM;
926 if (t == netdev_priv(ign->fb_tunnel_dev))
927 goto done;
928 dev = t->dev;
929 }
930 unregister_netdevice(dev);
931 err = 0;
932 break;
933
934 default:
935 err = -EINVAL;
936 }
937
938done:
939 return err;
940}
941
c12b395a 942static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
b789843c
XL		 943 unsigned short type, const void *daddr,
944 const void *saddr, unsigned int len)
c12b395a 945{
946 struct ip6_tnl *t = netdev_priv(dev);
b789843c
XL		 947 struct ipv6hdr *ipv6h;
948 __be16 *p;
c12b395a 949
b789843c
XL		 950 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
951 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
952 t->fl.u.ip6.flowlabel,
953 true, &t->fl.u.ip6));
c12b395a 954 ipv6h->hop_limit = t->parms.hop_limit;
955 ipv6h->nexthdr = NEXTHDR_GRE;
956 ipv6h->saddr = t->parms.laddr;
957 ipv6h->daddr = t->parms.raddr;
958
b789843c
XL		 959 p = (__be16 *)(ipv6h + 1);
960 p[0] = t->parms.o_flags;
961 p[1] = htons(type);
c12b395a 962
963 /*
964 * Set the source hardware address.
965 */
966
967 if (saddr)
968 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
969 if (daddr)
970 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
971 if (!ipv6_addr_any(&ipv6h->daddr))
972 return t->hlen;
973
974 return -t->hlen;
975}
976
c12b395a 977static const struct header_ops ip6gre_header_ops = {
978 .create = ip6gre_header,
c12b395a 979};
980
981static const struct net_device_ops ip6gre_netdev_ops = {
982 .ndo_init = ip6gre_tunnel_init,
983 .ndo_uninit = ip6gre_tunnel_uninit,
984 .ndo_start_xmit = ip6gre_tunnel_xmit,
985 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
b05229f4 986 .ndo_change_mtu = ip6_tnl_change_mtu,
f61dd388 987 .ndo_get_stats64 = ip_tunnel_get_stats64,
ecf2c06a 988 .ndo_get_iflink = ip6_tnl_get_iflink,
c12b395a 989};
990
991static void ip6gre_dev_free(struct net_device *dev)
992{
cdf3464e
MKL		 993 struct ip6_tnl *t = netdev_priv(dev);
994
607f725f 995 dst_cache_destroy(&t->dst_cache);
c12b395a 996 free_percpu(dev->tstats);
c12b395a 997}
998
999static void ip6gre_tunnel_setup(struct net_device *dev)
1000{
c12b395a 1001 dev->netdev_ops = &ip6gre_netdev_ops;
cf124db5
DM		 1002 dev->needs_free_netdev = true;
1003 dev->priv_destructor = ip6gre_dev_free;
c12b395a 1004
1005 dev->type = ARPHRD_IP6GRE;
b05229f4 1006
c12b395a 1007 dev->flags |= IFF_NOARP;
c12b395a 1008 dev->addr_len = sizeof(struct in6_addr);
02875878 1009 netif_keep_dst(dev);
45ce0fd1
FJ		 1010 /* This perm addr will be used as interface identifier by IPv6 */
1011 dev->addr_assign_type = NET_ADDR_RANDOM;
1012 eth_random_addr(dev->perm_addr);
c12b395a 1013}
1014
a3c119d3 1015static int ip6gre_tunnel_init_common(struct net_device *dev)
c12b395a 1016{
1017 struct ip6_tnl *tunnel;
cdf3464e 1018 int ret;
b05229f4 1019 int t_hlen;
c12b395a 1020
1021 tunnel = netdev_priv(dev);
1022
1023 tunnel->dev = dev;
0bd87628 1024 tunnel->net = dev_net(dev);
c12b395a 1025 strcpy(tunnel->parms.name, dev->name);
1026
a3c119d3
MKL		 1027 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1028 if (!dev->tstats)
1029 return -ENOMEM;
1030
607f725f 1031 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
cdf3464e
MKL		 1032 if (ret) {
1033 free_percpu(dev->tstats);
1034 dev->tstats = NULL;
1035 return ret;
1036 }
1037
b05229f4 1038 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1faf3d9f 1039 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
db2ec95d 1040 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
b05229f4 1041
db2ec95d
TH		 1042 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1043 dev->mtu = ETH_DATA_LEN - t_hlen;
1b227e53
HY		 1044 if (dev->type == ARPHRD_ETHER)
1045 dev->mtu -= ETH_HLEN;
b05229f4
TH		 1046 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1047 dev->mtu -= 8;
1048
a3c119d3
MKL		 1049 return 0;
1050}
1051
1052static int ip6gre_tunnel_init(struct net_device *dev)
1053{
1054 struct ip6_tnl *tunnel;
1055 int ret;
1056
1057 ret = ip6gre_tunnel_init_common(dev);
1058 if (ret)
1059 return ret;
1060
1061 tunnel = netdev_priv(dev);
1062
c12b395a 1063 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1064 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1065
1066 if (ipv6_addr_any(&tunnel->parms.raddr))
1067 dev->header_ops = &ip6gre_header_ops;
1068
c12b395a 1069 return 0;
1070}
1071
1072static void ip6gre_fb_tunnel_init(struct net_device *dev)
1073{
1074 struct ip6_tnl *tunnel = netdev_priv(dev);
1075
1076 tunnel->dev = dev;
0bd87628 1077 tunnel->net = dev_net(dev);
c12b395a 1078 strcpy(tunnel->parms.name, dev->name);
1079
1080 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1081
1082 dev_hold(dev);
1083}
1084
1085
1086static struct inet6_protocol ip6gre_protocol __read_mostly = {
308edfdf 1087 .handler = gre_rcv,
c12b395a 1088 .err_handler = ip6gre_err,
1089 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1090};
1091
22f08069 1092static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
c12b395a 1093{
22f08069
ND		 1094 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1095 struct net_device *dev, *aux;
c12b395a 1096 int prio;
1097
22f08069
ND		 1098 for_each_netdev_safe(net, dev, aux)
1099 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1100 dev->rtnl_link_ops == &ip6gre_tap_ops)
1101 unregister_netdevice_queue(dev, head);
1102
c12b395a 1103 for (prio = 0; prio < 4; prio++) {
1104 int h;
e87a8f24 1105 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
c12b395a 1106 struct ip6_tnl *t;
1107
1108 t = rtnl_dereference(ign->tunnels[prio][h]);
1109
53b24b8f 1110 while (t) {
22f08069
ND		 1111 /* If dev is in the same netns, it has already
1112 * been added to the list by the previous loop.
1113 */
1114 if (!net_eq(dev_net(t->dev), net))
1115 unregister_netdevice_queue(t->dev,
1116 head);
c12b395a 1117 t = rtnl_dereference(t->next);
1118 }
1119 }
1120 }
1121}
1122
1123static int __net_init ip6gre_init_net(struct net *net)
1124{
1125 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1126 int err;
1127
1128 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
c835a677
TG		 1129 NET_NAME_UNKNOWN,
1130 ip6gre_tunnel_setup);
c12b395a 1131 if (!ign->fb_tunnel_dev) {
1132 err = -ENOMEM;
1133 goto err_alloc_dev;
1134 }
1135 dev_net_set(ign->fb_tunnel_dev, net);
22f08069
ND		 1136 /* FB netdevice is special: we have one, and only one per netns.
1137 * Allowing to move it to another netns is clearly unsafe.
1138 */
1139 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1140
c12b395a 1141
1142 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1143 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1144
1145 err = register_netdev(ign->fb_tunnel_dev);
1146 if (err)
1147 goto err_reg_dev;
1148
1149 rcu_assign_pointer(ign->tunnels_wc[0],
1150 netdev_priv(ign->fb_tunnel_dev));
1151 return 0;
1152
1153err_reg_dev:
cf124db5 1154 free_netdev(ign->fb_tunnel_dev);
c12b395a 1155err_alloc_dev:
1156 return err;
1157}
1158
1159static void __net_exit ip6gre_exit_net(struct net *net)
1160{
c12b395a 1161 LIST_HEAD(list);
1162
c12b395a 1163 rtnl_lock();
22f08069 1164 ip6gre_destroy_tunnels(net, &list);
c12b395a 1165 unregister_netdevice_many(&list);
1166 rtnl_unlock();
1167}
1168
1169static struct pernet_operations ip6gre_net_ops = {
1170 .init = ip6gre_init_net,
1171 .exit = ip6gre_exit_net,
1172 .id = &ip6gre_net_id,
1173 .size = sizeof(struct ip6gre_net),
1174};
1175
a8b8a889
MS		 1176static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1177 struct netlink_ext_ack *extack)
c12b395a 1178{
1179 __be16 flags;
1180
1181 if (!data)
1182 return 0;
1183
1184 flags = 0;
1185 if (data[IFLA_GRE_IFLAGS])
1186 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1187 if (data[IFLA_GRE_OFLAGS])
1188 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1189 if (flags & (GRE_VERSION|GRE_ROUTING))
1190 return -EINVAL;
1191
1192 return 0;
1193}
1194
a8b8a889
MS		 1195static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1196 struct netlink_ext_ack *extack)
c12b395a 1197{
1198 struct in6_addr daddr;
1199
1200 if (tb[IFLA_ADDRESS]) {
1201 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1202 return -EINVAL;
1203 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1204 return -EADDRNOTAVAIL;
1205 }
1206
1207 if (!data)
1208 goto out;
1209
1210 if (data[IFLA_GRE_REMOTE]) {
67b61f6c 1211 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
c12b395a 1212 if (ipv6_addr_any(&daddr))
1213 return -EINVAL;
1214 }
1215
1216out:
a8b8a889 1217 return ip6gre_tunnel_validate(tb, data, extack);
c12b395a 1218}
1219
1220
1221static void ip6gre_netlink_parms(struct nlattr *data[],
1222 struct __ip6_tnl_parm *parms)
1223{
1224 memset(parms, 0, sizeof(*parms));
1225
1226 if (!data)
1227 return;
1228
1229 if (data[IFLA_GRE_LINK])
1230 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1231
1232 if (data[IFLA_GRE_IFLAGS])
f41fe3c2
TH		 1233 parms->i_flags = gre_flags_to_tnl_flags(
1234 nla_get_be16(data[IFLA_GRE_IFLAGS]));
c12b395a 1235
1236 if (data[IFLA_GRE_OFLAGS])
f41fe3c2
TH		 1237 parms->o_flags = gre_flags_to_tnl_flags(
1238 nla_get_be16(data[IFLA_GRE_OFLAGS]));
c12b395a 1239
1240 if (data[IFLA_GRE_IKEY])
1241 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1242
1243 if (data[IFLA_GRE_OKEY])
1244 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1245
1246 if (data[IFLA_GRE_LOCAL])
67b61f6c 1247 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
c12b395a 1248
1249 if (data[IFLA_GRE_REMOTE])
67b61f6c 1250 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
c12b395a 1251
1252 if (data[IFLA_GRE_TTL])
1253 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1254
1255 if (data[IFLA_GRE_ENCAP_LIMIT])
1256 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1257
1258 if (data[IFLA_GRE_FLOWINFO])
c2675de4 1259 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
c12b395a 1260
1261 if (data[IFLA_GRE_FLAGS])
1262 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
0a473b82
CG		 1263
1264 if (data[IFLA_GRE_FWMARK])
1265 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
c12b395a 1266}
1267
1268static int ip6gre_tap_init(struct net_device *dev)
1269{
1270 struct ip6_tnl *tunnel;
a3c119d3 1271 int ret;
c12b395a 1272
a3c119d3
MKL		 1273 ret = ip6gre_tunnel_init_common(dev);
1274 if (ret)
1275 return ret;
c12b395a 1276
0a46baaf
SC		 1277 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1278
a3c119d3 1279 tunnel = netdev_priv(dev);
c12b395a 1280
1281 ip6gre_tnl_link_config(tunnel, 1);
1282
c12b395a 1283 return 0;
1284}
1285
1286static const struct net_device_ops ip6gre_tap_netdev_ops = {
1287 .ndo_init = ip6gre_tap_init,
1288 .ndo_uninit = ip6gre_tunnel_uninit,
1289 .ndo_start_xmit = ip6gre_tunnel_xmit,
1290 .ndo_set_mac_address = eth_mac_addr,
1291 .ndo_validate_addr = eth_validate_addr,
b05229f4 1292 .ndo_change_mtu = ip6_tnl_change_mtu,
f61dd388 1293 .ndo_get_stats64 = ip_tunnel_get_stats64,
ecf2c06a 1294 .ndo_get_iflink = ip6_tnl_get_iflink,
c12b395a 1295};
1296
ac4eb009
AD		 1297#define GRE6_FEATURES (NETIF_F_SG | \
1298 NETIF_F_FRAGLIST | \
1299 NETIF_F_HIGHDMA | \
1300 NETIF_F_HW_CSUM)
1301
c12b395a 1302static void ip6gre_tap_setup(struct net_device *dev)
1303{
1304
1305 ether_setup(dev);
1306
1307 dev->netdev_ops = &ip6gre_tap_netdev_ops;
cf124db5
DM		 1308 dev->needs_free_netdev = true;
1309 dev->priv_destructor = ip6gre_dev_free;
c12b395a 1310
c12b395a 1311 dev->features |= NETIF_F_NETNS_LOCAL;
d13b161c 1312 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
0a46baaf 1313 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
970640a5 1314 netif_keep_dst(dev);
c12b395a 1315}
1316
1faf3d9f
TH		 1317static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1318 struct ip_tunnel_encap *ipencap)
1319{
1320 bool ret = false;
1321
1322 memset(ipencap, 0, sizeof(*ipencap));
1323
1324 if (!data)
1325 return ret;
1326
1327 if (data[IFLA_GRE_ENCAP_TYPE]) {
1328 ret = true;
1329 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1330 }
1331
1332 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1333 ret = true;
1334 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1335 }
1336
1337 if (data[IFLA_GRE_ENCAP_SPORT]) {
1338 ret = true;
1339 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1340 }
1341
1342 if (data[IFLA_GRE_ENCAP_DPORT]) {
1343 ret = true;
1344 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1345 }
1346
1347 return ret;
1348}
1349
c12b395a 1350static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
7a3f4a18
MS		 1351 struct nlattr *tb[], struct nlattr *data[],
1352 struct netlink_ext_ack *extack)
c12b395a 1353{
1354 struct ip6_tnl *nt;
1355 struct net *net = dev_net(dev);
1356 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1faf3d9f 1357 struct ip_tunnel_encap ipencap;
c12b395a 1358 int err;
1359
1360 nt = netdev_priv(dev);
1faf3d9f
TH		 1361
1362 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1363 int err = ip6_tnl_encap_setup(nt, &ipencap);
1364
1365 if (err < 0)
1366 return err;
1367 }
1368
c12b395a 1369 ip6gre_netlink_parms(data, &nt->parms);
1370
1371 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1372 return -EEXIST;
1373
1374 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1375 eth_hw_addr_random(dev);
1376
1377 nt->dev = dev;
0bd87628 1378 nt->net = dev_net(dev);
c12b395a 1379 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1380
ac4eb009
AD		 1381 dev->features |= GRE6_FEATURES;
1382 dev->hw_features |= GRE6_FEATURES;
1383
b45bd1d7 1384 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
6a553681
AD		 1385 /* TCP offload with GRE SEQ is not supported, nor
1386 * can we support 2 levels of outer headers requiring
1387 * an update.
3a80e1fa 1388 */
6a553681
AD		 1389 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1390 (nt->encap.type == TUNNEL_ENCAP_NONE)) {
1391 dev->features |= NETIF_F_GSO_SOFTWARE;
1392 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1393 }
3a80e1fa
AD		 1394
1395 /* Can use a lockless transmit, unless we generate
1396 * output sequences
1397 */
c12b395a 1398 dev->features |= NETIF_F_LLTX;
3a80e1fa 1399 }
c12b395a 1400
1401 err = register_netdevice(dev);
1402 if (err)
1403 goto out;
1404
1405 dev_hold(dev);
1406 ip6gre_tunnel_link(ign, nt);
1407
1408out:
1409 return err;
1410}
1411
1412static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
ad744b22
MS		 1413 struct nlattr *data[],
1414 struct netlink_ext_ack *extack)
c12b395a 1415{
22f08069
ND		 1416 struct ip6_tnl *t, *nt = netdev_priv(dev);
1417 struct net *net = nt->net;
c12b395a 1418 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1419 struct __ip6_tnl_parm p;
1faf3d9f 1420 struct ip_tunnel_encap ipencap;
c12b395a 1421
1422 if (dev == ign->fb_tunnel_dev)
1423 return -EINVAL;
1424
1faf3d9f
TH		 1425 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1426 int err = ip6_tnl_encap_setup(nt, &ipencap);
1427
1428 if (err < 0)
1429 return err;
1430 }
1431
c12b395a 1432 ip6gre_netlink_parms(data, &p);
1433
1434 t = ip6gre_tunnel_locate(net, &p, 0);
1435
1436 if (t) {
1437 if (t->dev != dev)
1438 return -EEXIST;
1439 } else {
1440 t = nt;
c12b395a 1441 }
1442
6a61d4db
ND		 1443 ip6gre_tunnel_unlink(ign, t);
1444 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1445 ip6gre_tunnel_link(ign, t);
c12b395a 1446 return 0;
1447}
1448
54d63f78
ND		 1449static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
1450{
1451 struct net *net = dev_net(dev);
1452 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1453
1454 if (dev != ign->fb_tunnel_dev)
1455 unregister_netdevice_queue(dev, head);
1456}
1457
c12b395a 1458static size_t ip6gre_get_size(const struct net_device *dev)
1459{
1460 return
1461 /* IFLA_GRE_LINK */
1462 nla_total_size(4) +
1463 /* IFLA_GRE_IFLAGS */
1464 nla_total_size(2) +
1465 /* IFLA_GRE_OFLAGS */
1466 nla_total_size(2) +
1467 /* IFLA_GRE_IKEY */
1468 nla_total_size(4) +
1469 /* IFLA_GRE_OKEY */
1470 nla_total_size(4) +
1471 /* IFLA_GRE_LOCAL */
a3754133 1472 nla_total_size(sizeof(struct in6_addr)) +
c12b395a 1473 /* IFLA_GRE_REMOTE */
a3754133 1474 nla_total_size(sizeof(struct in6_addr)) +
c12b395a 1475 /* IFLA_GRE_TTL */
1476 nla_total_size(1) +
c12b395a 1477 /* IFLA_GRE_ENCAP_LIMIT */
1478 nla_total_size(1) +
1479 /* IFLA_GRE_FLOWINFO */
1480 nla_total_size(4) +
1481 /* IFLA_GRE_FLAGS */
1482 nla_total_size(4) +
1faf3d9f
TH		 1483 /* IFLA_GRE_ENCAP_TYPE */
1484 nla_total_size(2) +
1485 /* IFLA_GRE_ENCAP_FLAGS */
1486 nla_total_size(2) +
1487 /* IFLA_GRE_ENCAP_SPORT */
1488 nla_total_size(2) +
1489 /* IFLA_GRE_ENCAP_DPORT */
1490 nla_total_size(2) +
0a473b82
CG		 1491 /* IFLA_GRE_FWMARK */
1492 nla_total_size(4) +
c12b395a 1493 0;
1494}
1495
1496static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1497{
1498 struct ip6_tnl *t = netdev_priv(dev);
1499 struct __ip6_tnl_parm *p = &t->parms;
1500
1501 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
f41fe3c2
TH		 1502 nla_put_be16(skb, IFLA_GRE_IFLAGS,
1503 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
1504 nla_put_be16(skb, IFLA_GRE_OFLAGS,
1505 gre_tnl_flags_to_gre_flags(p->o_flags)) ||
c12b395a 1506 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1507 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
930345ea
JB		 1508 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
1509 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
c12b395a 1510 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
c12b395a 1511 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1512 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
0a473b82
CG		 1513 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
1514 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
c12b395a 1515 goto nla_put_failure;
1faf3d9f
TH		 1516
1517 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
1518 t->encap.type) ||
1519 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
1520 t->encap.sport) ||
1521 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
1522 t->encap.dport) ||
1523 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
1524 t->encap.flags))
1525 goto nla_put_failure;
1526
c12b395a 1527 return 0;
1528
1529nla_put_failure:
1530 return -EMSGSIZE;
1531}
1532
1533static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1534 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1535 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1536 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1537 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1538 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1539 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1540 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1541 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1542 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1543 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1544 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1faf3d9f
TH		 1545 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
1546 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
1547 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
1548 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
0a473b82 1549 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
c12b395a 1550};
1551
1552static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1553 .kind = "ip6gre",
1554 .maxtype = IFLA_GRE_MAX,
1555 .policy = ip6gre_policy,
1556 .priv_size = sizeof(struct ip6_tnl),
1557 .setup = ip6gre_tunnel_setup,
1558 .validate = ip6gre_tunnel_validate,
1559 .newlink = ip6gre_newlink,
1560 .changelink = ip6gre_changelink,
54d63f78 1561 .dellink = ip6gre_dellink,
c12b395a 1562 .get_size = ip6gre_get_size,
1563 .fill_info = ip6gre_fill_info,
1728d4fa 1564 .get_link_net = ip6_tnl_get_link_net,
c12b395a 1565};
1566
1567static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1568 .kind = "ip6gretap",
1569 .maxtype = IFLA_GRE_MAX,
1570 .policy = ip6gre_policy,
1571 .priv_size = sizeof(struct ip6_tnl),
1572 .setup = ip6gre_tap_setup,
1573 .validate = ip6gre_tap_validate,
1574 .newlink = ip6gre_newlink,
1575 .changelink = ip6gre_changelink,
1576 .get_size = ip6gre_get_size,
1577 .fill_info = ip6gre_fill_info,
3390e397 1578 .get_link_net = ip6_tnl_get_link_net,
c12b395a 1579};
1580
1581/*
1582 * And now the modules code and kernel interface.
1583 */
1584
1585static int __init ip6gre_init(void)
1586{
1587 int err;
1588
1589 pr_info("GRE over IPv6 tunneling driver\n");
1590
1591 err = register_pernet_device(&ip6gre_net_ops);
1592 if (err < 0)
1593 return err;
1594
1595 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1596 if (err < 0) {
1597 pr_info("%s: can't add protocol\n", __func__);
1598 goto add_proto_failed;
1599 }
1600
1601 err = rtnl_link_register(&ip6gre_link_ops);
1602 if (err < 0)
1603 goto rtnl_link_failed;
1604
1605 err = rtnl_link_register(&ip6gre_tap_ops);
1606 if (err < 0)
1607 goto tap_ops_failed;
1608
1609out:
1610 return err;
1611
1612tap_ops_failed:
1613 rtnl_link_unregister(&ip6gre_link_ops);
1614rtnl_link_failed:
1615 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1616add_proto_failed:
1617 unregister_pernet_device(&ip6gre_net_ops);
1618 goto out;
1619}
1620
1621static void __exit ip6gre_fini(void)
1622{
1623 rtnl_link_unregister(&ip6gre_tap_ops);
1624 rtnl_link_unregister(&ip6gre_link_ops);
1625 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1626 unregister_pernet_device(&ip6gre_net_ops);
1627}
1628
1629module_init(ip6gre_init);
1630module_exit(ip6gre_fini);
1631MODULE_LICENSE("GPL");
1632MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1633MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1634MODULE_ALIAS_RTNL_LINK("ip6gre");
5a4ee9a9 1635MODULE_ALIAS_RTNL_LINK("ip6gretap");
c12b395a 1636MODULE_ALIAS_NETDEV("ip6gre0");
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