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Merge branch 'GREoIPV6-followups'
[deliverable/linux.git] / net / ipv6 / ip6_gre.c
CommitLineData
c12b395a 1/*
2 * GRE over IPv6 protocol decoder.
3 *
4 * Authors: Dmitry Kozlov (xeb@mail.ru)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 */
12
13#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15#include <linux/capability.h>
16#include <linux/module.h>
17#include <linux/types.h>
18#include <linux/kernel.h>
19#include <linux/slab.h>
20#include <linux/uaccess.h>
21#include <linux/skbuff.h>
22#include <linux/netdevice.h>
23#include <linux/in.h>
24#include <linux/tcp.h>
25#include <linux/udp.h>
26#include <linux/if_arp.h>
c12b395a 27#include <linux/init.h>
28#include <linux/in6.h>
29#include <linux/inetdevice.h>
30#include <linux/igmp.h>
31#include <linux/netfilter_ipv4.h>
32#include <linux/etherdevice.h>
33#include <linux/if_ether.h>
34#include <linux/hash.h>
35#include <linux/if_tunnel.h>
36#include <linux/ip6_tunnel.h>
37
38#include <net/sock.h>
39#include <net/ip.h>
c5441932 40#include <net/ip_tunnels.h>
c12b395a 41#include <net/icmp.h>
42#include <net/protocol.h>
43#include <net/addrconf.h>
44#include <net/arp.h>
45#include <net/checksum.h>
46#include <net/dsfield.h>
47#include <net/inet_ecn.h>
48#include <net/xfrm.h>
49#include <net/net_namespace.h>
50#include <net/netns/generic.h>
51#include <net/rtnetlink.h>
52
53#include <net/ipv6.h>
54#include <net/ip6_fib.h>
55#include <net/ip6_route.h>
56#include <net/ip6_tunnel.h>
308edfdf 57#include <net/gre.h>
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
c12b395a 64#define HASH_SIZE_SHIFT 5
65#define HASH_SIZE (1 << HASH_SIZE_SHIFT)
66
67static int ip6gre_net_id __read_mostly;
68struct ip6gre_net {
69 struct ip6_tnl __rcu *tunnels[4][HASH_SIZE];
70
71 struct net_device *fb_tunnel_dev;
72};
73
74static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
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
99#define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(HASH_SIZE - 1))
100static u32 HASH_ADDR(const struct in6_addr *addr)
101{
102 u32 hash = ipv6_addr_hash(addr);
103
104 return hash_32(hash, HASH_SIZE_SHIFT);
105}
106
107#define tunnels_r_l tunnels[3]
108#define tunnels_r tunnels[2]
109#define tunnels_l tunnels[1]
110#define tunnels_wc tunnels[0]
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,
370 u8 type, u8 code, int offset, __be32 info)
371{
372 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
b87fb39e
ED		 373 __be16 *p = (__be16 *)(skb->data + offset);
374 int grehlen = offset + 4;
c12b395a 375 struct ip6_tnl *t;
376 __be16 flags;
377
378 flags = p[0];
379 if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) {
380 if (flags&(GRE_VERSION|GRE_ROUTING))
381 return;
382 if (flags&GRE_KEY) {
383 grehlen += 4;
384 if (flags&GRE_CSUM)
385 grehlen += 4;
386 }
387 }
388
389 /* If only 8 bytes returned, keyed message will be dropped here */
b87fb39e 390 if (!pskb_may_pull(skb, grehlen))
c12b395a 391 return;
b87fb39e
ED		 392 ipv6h = (const struct ipv6hdr *)skb->data;
393 p = (__be16 *)(skb->data + offset);
c12b395a 394
c12b395a 395 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
396 flags & GRE_KEY ?
397 *(((__be32 *)p) + (grehlen / 4) - 1) : 0,
398 p[1]);
63159f29 399 if (!t)
0c5794a6 400 return;
c12b395a 401
402 switch (type) {
403 __u32 teli;
404 struct ipv6_tlv_tnl_enc_lim *tel;
405 __u32 mtu;
406 case ICMPV6_DEST_UNREACH:
a46496ce
MB		 407 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
408 t->parms.name);
c12b395a 409 break;
410 case ICMPV6_TIME_EXCEED:
411 if (code == ICMPV6_EXC_HOPLIMIT) {
a46496ce
MB		 412 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
413 t->parms.name);
c12b395a 414 }
415 break;
416 case ICMPV6_PARAMPROB:
417 teli = 0;
418 if (code == ICMPV6_HDR_FIELD)
419 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
420
d1e158e2 421 if (teli && teli == be32_to_cpu(info) - 2) {
c12b395a 422 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
423 if (tel->encap_limit == 0) {
a46496ce
MB		 424 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
425 t->parms.name);
c12b395a 426 }
427 } else {
a46496ce
MB		 428 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
429 t->parms.name);
c12b395a 430 }
431 break;
432 case ICMPV6_PKT_TOOBIG:
d1e158e2 433 mtu = be32_to_cpu(info) - offset;
c12b395a 434 if (mtu < IPV6_MIN_MTU)
435 mtu = IPV6_MIN_MTU;
436 t->dev->mtu = mtu;
437 break;
438 }
439
440 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
441 t->err_count++;
442 else
443 t->err_count = 1;
444 t->err_time = jiffies;
c12b395a 445}
446
308edfdf 447static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
c12b395a 448{
449 const struct ipv6hdr *ipv6h;
c12b395a 450 struct ip6_tnl *tunnel;
c12b395a 451
452 ipv6h = ipv6_hdr(skb);
c12b395a 453 tunnel = ip6gre_tunnel_lookup(skb->dev,
308edfdf
TH		 454 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
455 tpi->proto);
c12b395a 456 if (tunnel) {
308edfdf 457 ip6_tnl_rcv(tunnel, skb, tpi, NULL, false);
c12b395a 458
308edfdf
TH		 459 return PACKET_RCVD;
460 }
eccc1bb8 461
308edfdf
TH		 462 return PACKET_REJECT;
463}
eccc1bb8 464
308edfdf
TH		 465static int gre_rcv(struct sk_buff *skb)
466{
467 struct tnl_ptk_info tpi;
468 bool csum_err = false;
469 int hdr_len;
eccc1bb8 470
da73b4e9 471 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6));
f132ae7c 472 if (hdr_len < 0)
308edfdf 473 goto drop;
c12b395a 474
308edfdf
TH		 475 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
476 goto drop;
c12b395a 477
308edfdf 478 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
c12b395a 479 return 0;
c12b395a 480
308edfdf 481 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
c12b395a 482drop:
c12b395a 483 kfree_skb(skb);
484 return 0;
485}
486
487struct ipv6_tel_txoption {
488 struct ipv6_txoptions ops;
489 __u8 dst_opt[8];
490};
491
b05229f4 492static int gre_handle_offloads(struct sk_buff *skb, bool csum)
c12b395a 493{
b05229f4
TH		 494 return iptunnel_handle_offloads(skb,
495 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
c12b395a 496}
497
b05229f4
TH		 498static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
499 struct net_device *dev, __u8 dsfield,
500 struct flowi6 *fl6, int encap_limit,
501 __u32 *pmtu, __be16 proto)
c12b395a 502{
c12b395a 503 struct ip6_tnl *tunnel = netdev_priv(dev);
b05229f4
TH		 504 __be16 protocol = (dev->type == ARPHRD_ETHER) ?
505 htons(ETH_P_TEB) : proto;
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
TH		 518 /* Push GRE header. */
519 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
520 protocol, tunnel->parms.o_key, htonl(tunnel->o_seqno));
c12b395a 521
d27bff9c 522 skb_set_inner_protocol(skb, protocol);
c12b395a 523
b05229f4
TH		 524 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
525 NEXTHDR_GRE);
c12b395a 526}
527
528static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
529{
530 struct ip6_tnl *t = netdev_priv(dev);
531 const struct iphdr *iph = ip_hdr(skb);
532 int encap_limit = -1;
533 struct flowi6 fl6;
534 __u8 dsfield;
535 __u32 mtu;
536 int err;
537
5146d1f1
BH		 538 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
539
c12b395a 540 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
541 encap_limit = t->parms.encap_limit;
542
543 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
c12b395a 544
545 dsfield = ipv4_get_dsfield(iph);
546
547 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
548 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
549 & IPV6_TCLASS_MASK;
550 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
551 fl6.flowi6_mark = skb->mark;
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));
585 if (offset > 0) {
586 struct ipv6_tlv_tnl_enc_lim *tel;
587 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
588 if (tel->encap_limit == 0) {
589 icmpv6_send(skb, ICMPV6_PARAMPROB,
590 ICMPV6_HDR_FIELD, offset + 2);
591 return -1;
592 }
593 encap_limit = tel->encap_limit - 1;
594 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
595 encap_limit = t->parms.encap_limit;
596
597 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
c12b395a 598
599 dsfield = ipv6_get_dsfield(ipv6h);
600 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
601 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
602 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
3308de2b 603 fl6.flowlabel |= ip6_flowlabel(ipv6h);
c12b395a 604 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
605 fl6.flowi6_mark = skb->mark;
606
b05229f4
TH		 607 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
608 return -1;
609
610 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
611 &mtu, skb->protocol);
c12b395a 612 if (err != 0) {
613 if (err == -EMSGSIZE)
614 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
615 return -1;
616 }
617
618 return 0;
619}
620
621/**
622 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
623 * @t: the outgoing tunnel device
624 * @hdr: IPv6 header from the incoming packet
625 *
626 * Description:
627 * Avoid trivial tunneling loop by checking that tunnel exit-point
628 * doesn't match source of incoming packet.
629 *
630 * Return:
631 * 1 if conflict,
632 * 0 else
633 **/
634
635static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
636 const struct ipv6hdr *hdr)
637{
638 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
639}
640
641static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
642{
643 struct ip6_tnl *t = netdev_priv(dev);
644 int encap_limit = -1;
645 struct flowi6 fl6;
646 __u32 mtu;
647 int err;
648
649 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
650 encap_limit = t->parms.encap_limit;
651
652 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
653 fl6.flowi6_proto = skb->protocol;
654
b05229f4
TH		 655 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
656 if (err)
657 return err;
658
659 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
c12b395a 660
661 return err;
662}
663
664static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
665 struct net_device *dev)
666{
667 struct ip6_tnl *t = netdev_priv(dev);
668 struct net_device_stats *stats = &t->dev->stats;
669 int ret;
670
d5005140 671 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
41ab3e31 672 goto tx_err;
c12b395a 673
674 switch (skb->protocol) {
675 case htons(ETH_P_IP):
676 ret = ip6gre_xmit_ipv4(skb, dev);
677 break;
678 case htons(ETH_P_IPV6):
679 ret = ip6gre_xmit_ipv6(skb, dev);
680 break;
681 default:
682 ret = ip6gre_xmit_other(skb, dev);
683 break;
684 }
685
686 if (ret < 0)
687 goto tx_err;
688
689 return NETDEV_TX_OK;
690
691tx_err:
692 stats->tx_errors++;
693 stats->tx_dropped++;
694 kfree_skb(skb);
695 return NETDEV_TX_OK;
696}
697
698static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
699{
700 struct net_device *dev = t->dev;
701 struct __ip6_tnl_parm *p = &t->parms;
702 struct flowi6 *fl6 = &t->fl.u.ip6;
db2ec95d 703 int t_hlen;
c12b395a 704
705 if (dev->type != ARPHRD_ETHER) {
706 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
707 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
708 }
709
710 /* Set up flowi template */
711 fl6->saddr = p->laddr;
712 fl6->daddr = p->raddr;
713 fl6->flowi6_oif = p->link;
714 fl6->flowlabel = 0;
715
716 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
717 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
718 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
719 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
720
721 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
722 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
723
724 if (p->flags&IP6_TNL_F_CAP_XMIT &&
725 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
726 dev->flags |= IFF_POINTOPOINT;
727 else
728 dev->flags &= ~IFF_POINTOPOINT;
729
db2ec95d
TH		 730 t->tun_hlen = gre_calc_hlen(t->parms.o_flags);
731
1faf3d9f 732 t->hlen = t->encap_hlen + t->tun_hlen;
db2ec95d
TH		 733
734 t_hlen = t->hlen + sizeof(struct ipv6hdr);
c12b395a 735
736 if (p->flags & IP6_TNL_F_CAP_XMIT) {
737 int strict = (ipv6_addr_type(&p->raddr) &
738 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
739
22f08069 740 struct rt6_info *rt = rt6_lookup(t->net,
c12b395a 741 &p->raddr, &p->laddr,
742 p->link, strict);
743
63159f29 744 if (!rt)
c12b395a 745 return;
746
747 if (rt->dst.dev) {
db2ec95d
TH		 748 dev->hard_header_len = rt->dst.dev->hard_header_len +
749 t_hlen;
c12b395a 750
751 if (set_mtu) {
db2ec95d 752 dev->mtu = rt->dst.dev->mtu - t_hlen;
c12b395a 753 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
754 dev->mtu -= 8;
a9e242ca
AD		 755 if (dev->type == ARPHRD_ETHER)
756 dev->mtu -= ETH_HLEN;
c12b395a 757
758 if (dev->mtu < IPV6_MIN_MTU)
759 dev->mtu = IPV6_MIN_MTU;
760 }
761 }
94e187c0 762 ip6_rt_put(rt);
c12b395a 763 }
c12b395a 764}
765
766static int ip6gre_tnl_change(struct ip6_tnl *t,
767 const struct __ip6_tnl_parm *p, int set_mtu)
768{
769 t->parms.laddr = p->laddr;
770 t->parms.raddr = p->raddr;
771 t->parms.flags = p->flags;
772 t->parms.hop_limit = p->hop_limit;
773 t->parms.encap_limit = p->encap_limit;
774 t->parms.flowinfo = p->flowinfo;
775 t->parms.link = p->link;
776 t->parms.proto = p->proto;
777 t->parms.i_key = p->i_key;
778 t->parms.o_key = p->o_key;
779 t->parms.i_flags = p->i_flags;
780 t->parms.o_flags = p->o_flags;
607f725f 781 dst_cache_reset(&t->dst_cache);
c12b395a 782 ip6gre_tnl_link_config(t, set_mtu);
783 return 0;
784}
785
786static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
787 const struct ip6_tnl_parm2 *u)
788{
789 p->laddr = u->laddr;
790 p->raddr = u->raddr;
791 p->flags = u->flags;
792 p->hop_limit = u->hop_limit;
793 p->encap_limit = u->encap_limit;
794 p->flowinfo = u->flowinfo;
795 p->link = u->link;
796 p->i_key = u->i_key;
797 p->o_key = u->o_key;
f41fe3c2
TH		 798 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
799 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
c12b395a 800 memcpy(p->name, u->name, sizeof(u->name));
801}
802
803static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
804 const struct __ip6_tnl_parm *p)
805{
806 u->proto = IPPROTO_GRE;
807 u->laddr = p->laddr;
808 u->raddr = p->raddr;
809 u->flags = p->flags;
810 u->hop_limit = p->hop_limit;
811 u->encap_limit = p->encap_limit;
812 u->flowinfo = p->flowinfo;
813 u->link = p->link;
814 u->i_key = p->i_key;
815 u->o_key = p->o_key;
f41fe3c2
TH		 816 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
817 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
c12b395a 818 memcpy(u->name, p->name, sizeof(u->name));
819}
820
821static int ip6gre_tunnel_ioctl(struct net_device *dev,
822 struct ifreq *ifr, int cmd)
823{
824 int err = 0;
825 struct ip6_tnl_parm2 p;
826 struct __ip6_tnl_parm p1;
22f08069
ND		 827 struct ip6_tnl *t = netdev_priv(dev);
828 struct net *net = t->net;
c12b395a 829 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
830
308edfdf
TH		 831 memset(&p1, 0, sizeof(p1));
832
c12b395a 833 switch (cmd) {
834 case SIOCGETTUNNEL:
c12b395a 835 if (dev == ign->fb_tunnel_dev) {
836 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
837 err = -EFAULT;
838 break;
839 }
840 ip6gre_tnl_parm_from_user(&p1, &p);
841 t = ip6gre_tunnel_locate(net, &p1, 0);
63159f29 842 if (!t)
22f08069 843 t = netdev_priv(dev);
c12b395a 844 }
5dbd5068 845 memset(&p, 0, sizeof(p));
c12b395a 846 ip6gre_tnl_parm_to_user(&p, &t->parms);
847 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
848 err = -EFAULT;
849 break;
850
851 case SIOCADDTUNNEL:
852 case SIOCCHGTUNNEL:
853 err = -EPERM;
af31f412 854 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
c12b395a 855 goto done;
856
857 err = -EFAULT;
858 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
859 goto done;
860
861 err = -EINVAL;
862 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
863 goto done;
864
865 if (!(p.i_flags&GRE_KEY))
866 p.i_key = 0;
867 if (!(p.o_flags&GRE_KEY))
868 p.o_key = 0;
869
870 ip6gre_tnl_parm_from_user(&p1, &p);
871 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
872
873 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
53b24b8f 874 if (t) {
c12b395a 875 if (t->dev != dev) {
876 err = -EEXIST;
877 break;
878 }
879 } else {
880 t = netdev_priv(dev);
881
882 ip6gre_tunnel_unlink(ign, t);
883 synchronize_net();
884 ip6gre_tnl_change(t, &p1, 1);
885 ip6gre_tunnel_link(ign, t);
886 netdev_state_change(dev);
887 }
888 }
889
890 if (t) {
891 err = 0;
892
5dbd5068 893 memset(&p, 0, sizeof(p));
c12b395a 894 ip6gre_tnl_parm_to_user(&p, &t->parms);
895 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
896 err = -EFAULT;
897 } else
898 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
899 break;
900
901 case SIOCDELTUNNEL:
902 err = -EPERM;
af31f412 903 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
c12b395a 904 goto done;
905
906 if (dev == ign->fb_tunnel_dev) {
907 err = -EFAULT;
908 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
909 goto done;
910 err = -ENOENT;
911 ip6gre_tnl_parm_from_user(&p1, &p);
912 t = ip6gre_tunnel_locate(net, &p1, 0);
63159f29 913 if (!t)
c12b395a 914 goto done;
915 err = -EPERM;
916 if (t == netdev_priv(ign->fb_tunnel_dev))
917 goto done;
918 dev = t->dev;
919 }
920 unregister_netdevice(dev);
921 err = 0;
922 break;
923
924 default:
925 err = -EINVAL;
926 }
927
928done:
929 return err;
930}
931
c12b395a 932static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
933 unsigned short type,
934 const void *daddr, const void *saddr, unsigned int len)
935{
936 struct ip6_tnl *t = netdev_priv(dev);
937 struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen);
938 __be16 *p = (__be16 *)(ipv6h+1);
939
cb1ce2ef
TH		 940 ip6_flow_hdr(ipv6h, 0,
941 ip6_make_flowlabel(dev_net(dev), skb,
42240901 942 t->fl.u.ip6.flowlabel, true,
67800f9b 943 &t->fl.u.ip6));
c12b395a 944 ipv6h->hop_limit = t->parms.hop_limit;
945 ipv6h->nexthdr = NEXTHDR_GRE;
946 ipv6h->saddr = t->parms.laddr;
947 ipv6h->daddr = t->parms.raddr;
948
949 p[0] = t->parms.o_flags;
950 p[1] = htons(type);
951
952 /*
953 * Set the source hardware address.
954 */
955
956 if (saddr)
957 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
958 if (daddr)
959 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
960 if (!ipv6_addr_any(&ipv6h->daddr))
961 return t->hlen;
962
963 return -t->hlen;
964}
965
c12b395a 966static const struct header_ops ip6gre_header_ops = {
967 .create = ip6gre_header,
c12b395a 968};
969
970static const struct net_device_ops ip6gre_netdev_ops = {
971 .ndo_init = ip6gre_tunnel_init,
972 .ndo_uninit = ip6gre_tunnel_uninit,
973 .ndo_start_xmit = ip6gre_tunnel_xmit,
974 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
b05229f4 975 .ndo_change_mtu = ip6_tnl_change_mtu,
f61dd388 976 .ndo_get_stats64 = ip_tunnel_get_stats64,
ecf2c06a 977 .ndo_get_iflink = ip6_tnl_get_iflink,
c12b395a 978};
979
980static void ip6gre_dev_free(struct net_device *dev)
981{
cdf3464e
MKL		 982 struct ip6_tnl *t = netdev_priv(dev);
983
607f725f 984 dst_cache_destroy(&t->dst_cache);
c12b395a 985 free_percpu(dev->tstats);
986 free_netdev(dev);
987}
988
989static void ip6gre_tunnel_setup(struct net_device *dev)
990{
c12b395a 991 dev->netdev_ops = &ip6gre_netdev_ops;
992 dev->destructor = ip6gre_dev_free;
993
994 dev->type = ARPHRD_IP6GRE;
b05229f4 995
c12b395a 996 dev->flags |= IFF_NOARP;
c12b395a 997 dev->addr_len = sizeof(struct in6_addr);
02875878 998 netif_keep_dst(dev);
c12b395a 999}
1000
a3c119d3 1001static int ip6gre_tunnel_init_common(struct net_device *dev)
c12b395a 1002{
1003 struct ip6_tnl *tunnel;
cdf3464e 1004 int ret;
b05229f4 1005 int t_hlen;
c12b395a 1006
1007 tunnel = netdev_priv(dev);
1008
1009 tunnel->dev = dev;
0bd87628 1010 tunnel->net = dev_net(dev);
c12b395a 1011 strcpy(tunnel->parms.name, dev->name);
1012
a3c119d3
MKL		 1013 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1014 if (!dev->tstats)
1015 return -ENOMEM;
1016
607f725f 1017 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
cdf3464e
MKL		 1018 if (ret) {
1019 free_percpu(dev->tstats);
1020 dev->tstats = NULL;
1021 return ret;
1022 }
1023
b05229f4 1024 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1faf3d9f 1025 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
db2ec95d 1026 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
b05229f4 1027
db2ec95d
TH		 1028 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1029 dev->mtu = ETH_DATA_LEN - t_hlen;
b05229f4
TH		 1030 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1031 dev->mtu -= 8;
1032
a3c119d3
MKL		 1033 return 0;
1034}
1035
1036static int ip6gre_tunnel_init(struct net_device *dev)
1037{
1038 struct ip6_tnl *tunnel;
1039 int ret;
1040
1041 ret = ip6gre_tunnel_init_common(dev);
1042 if (ret)
1043 return ret;
1044
1045 tunnel = netdev_priv(dev);
1046
c12b395a 1047 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1048 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1049
1050 if (ipv6_addr_any(&tunnel->parms.raddr))
1051 dev->header_ops = &ip6gre_header_ops;
1052
c12b395a 1053 return 0;
1054}
1055
1056static void ip6gre_fb_tunnel_init(struct net_device *dev)
1057{
1058 struct ip6_tnl *tunnel = netdev_priv(dev);
1059
1060 tunnel->dev = dev;
0bd87628 1061 tunnel->net = dev_net(dev);
c12b395a 1062 strcpy(tunnel->parms.name, dev->name);
1063
1064 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1065
1066 dev_hold(dev);
1067}
1068
1069
1070static struct inet6_protocol ip6gre_protocol __read_mostly = {
308edfdf 1071 .handler = gre_rcv,
c12b395a 1072 .err_handler = ip6gre_err,
1073 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1074};
1075
22f08069 1076static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
c12b395a 1077{
22f08069
ND		 1078 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1079 struct net_device *dev, *aux;
c12b395a 1080 int prio;
1081
22f08069
ND		 1082 for_each_netdev_safe(net, dev, aux)
1083 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1084 dev->rtnl_link_ops == &ip6gre_tap_ops)
1085 unregister_netdevice_queue(dev, head);
1086
c12b395a 1087 for (prio = 0; prio < 4; prio++) {
1088 int h;
1089 for (h = 0; h < HASH_SIZE; h++) {
1090 struct ip6_tnl *t;
1091
1092 t = rtnl_dereference(ign->tunnels[prio][h]);
1093
53b24b8f 1094 while (t) {
22f08069
ND		 1095 /* If dev is in the same netns, it has already
1096 * been added to the list by the previous loop.
1097 */
1098 if (!net_eq(dev_net(t->dev), net))
1099 unregister_netdevice_queue(t->dev,
1100 head);
c12b395a 1101 t = rtnl_dereference(t->next);
1102 }
1103 }
1104 }
1105}
1106
1107static int __net_init ip6gre_init_net(struct net *net)
1108{
1109 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1110 int err;
1111
1112 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
c835a677
TG		 1113 NET_NAME_UNKNOWN,
1114 ip6gre_tunnel_setup);
c12b395a 1115 if (!ign->fb_tunnel_dev) {
1116 err = -ENOMEM;
1117 goto err_alloc_dev;
1118 }
1119 dev_net_set(ign->fb_tunnel_dev, net);
22f08069
ND		 1120 /* FB netdevice is special: we have one, and only one per netns.
1121 * Allowing to move it to another netns is clearly unsafe.
1122 */
1123 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1124
c12b395a 1125
1126 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1127 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1128
1129 err = register_netdev(ign->fb_tunnel_dev);
1130 if (err)
1131 goto err_reg_dev;
1132
1133 rcu_assign_pointer(ign->tunnels_wc[0],
1134 netdev_priv(ign->fb_tunnel_dev));
1135 return 0;
1136
1137err_reg_dev:
1138 ip6gre_dev_free(ign->fb_tunnel_dev);
1139err_alloc_dev:
1140 return err;
1141}
1142
1143static void __net_exit ip6gre_exit_net(struct net *net)
1144{
c12b395a 1145 LIST_HEAD(list);
1146
c12b395a 1147 rtnl_lock();
22f08069 1148 ip6gre_destroy_tunnels(net, &list);
c12b395a 1149 unregister_netdevice_many(&list);
1150 rtnl_unlock();
1151}
1152
1153static struct pernet_operations ip6gre_net_ops = {
1154 .init = ip6gre_init_net,
1155 .exit = ip6gre_exit_net,
1156 .id = &ip6gre_net_id,
1157 .size = sizeof(struct ip6gre_net),
1158};
1159
1160static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
1161{
1162 __be16 flags;
1163
1164 if (!data)
1165 return 0;
1166
1167 flags = 0;
1168 if (data[IFLA_GRE_IFLAGS])
1169 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1170 if (data[IFLA_GRE_OFLAGS])
1171 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1172 if (flags & (GRE_VERSION|GRE_ROUTING))
1173 return -EINVAL;
1174
1175 return 0;
1176}
1177
1178static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
1179{
1180 struct in6_addr daddr;
1181
1182 if (tb[IFLA_ADDRESS]) {
1183 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1184 return -EINVAL;
1185 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1186 return -EADDRNOTAVAIL;
1187 }
1188
1189 if (!data)
1190 goto out;
1191
1192 if (data[IFLA_GRE_REMOTE]) {
67b61f6c 1193 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
c12b395a 1194 if (ipv6_addr_any(&daddr))
1195 return -EINVAL;
1196 }
1197
1198out:
1199 return ip6gre_tunnel_validate(tb, data);
1200}
1201
1202
1203static void ip6gre_netlink_parms(struct nlattr *data[],
1204 struct __ip6_tnl_parm *parms)
1205{
1206 memset(parms, 0, sizeof(*parms));
1207
1208 if (!data)
1209 return;
1210
1211 if (data[IFLA_GRE_LINK])
1212 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1213
1214 if (data[IFLA_GRE_IFLAGS])
f41fe3c2
TH		 1215 parms->i_flags = gre_flags_to_tnl_flags(
1216 nla_get_be16(data[IFLA_GRE_IFLAGS]));
c12b395a 1217
1218 if (data[IFLA_GRE_OFLAGS])
f41fe3c2
TH		 1219 parms->o_flags = gre_flags_to_tnl_flags(
1220 nla_get_be16(data[IFLA_GRE_OFLAGS]));
c12b395a 1221
1222 if (data[IFLA_GRE_IKEY])
1223 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1224
1225 if (data[IFLA_GRE_OKEY])
1226 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1227
1228 if (data[IFLA_GRE_LOCAL])
67b61f6c 1229 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
c12b395a 1230
1231 if (data[IFLA_GRE_REMOTE])
67b61f6c 1232 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
c12b395a 1233
1234 if (data[IFLA_GRE_TTL])
1235 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1236
1237 if (data[IFLA_GRE_ENCAP_LIMIT])
1238 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1239
1240 if (data[IFLA_GRE_FLOWINFO])
1241 parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]);
1242
1243 if (data[IFLA_GRE_FLAGS])
1244 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1245}
1246
1247static int ip6gre_tap_init(struct net_device *dev)
1248{
1249 struct ip6_tnl *tunnel;
a3c119d3 1250 int ret;
c12b395a 1251
a3c119d3
MKL		 1252 ret = ip6gre_tunnel_init_common(dev);
1253 if (ret)
1254 return ret;
c12b395a 1255
a3c119d3 1256 tunnel = netdev_priv(dev);
c12b395a 1257
1258 ip6gre_tnl_link_config(tunnel, 1);
1259
c12b395a 1260 return 0;
1261}
1262
1263static const struct net_device_ops ip6gre_tap_netdev_ops = {
1264 .ndo_init = ip6gre_tap_init,
1265 .ndo_uninit = ip6gre_tunnel_uninit,
1266 .ndo_start_xmit = ip6gre_tunnel_xmit,
1267 .ndo_set_mac_address = eth_mac_addr,
1268 .ndo_validate_addr = eth_validate_addr,
b05229f4 1269 .ndo_change_mtu = ip6_tnl_change_mtu,
f61dd388 1270 .ndo_get_stats64 = ip_tunnel_get_stats64,
ecf2c06a 1271 .ndo_get_iflink = ip6_tnl_get_iflink,
c12b395a 1272};
1273
ac4eb009
AD		 1274#define GRE6_FEATURES (NETIF_F_SG | \
1275 NETIF_F_FRAGLIST | \
1276 NETIF_F_HIGHDMA | \
1277 NETIF_F_HW_CSUM)
1278
c12b395a 1279static void ip6gre_tap_setup(struct net_device *dev)
1280{
1281
1282 ether_setup(dev);
1283
1284 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1285 dev->destructor = ip6gre_dev_free;
1286
c12b395a 1287 dev->features |= NETIF_F_NETNS_LOCAL;
d13b161c 1288 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
c12b395a 1289}
1290
1faf3d9f
TH		 1291static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1292 struct ip_tunnel_encap *ipencap)
1293{
1294 bool ret = false;
1295
1296 memset(ipencap, 0, sizeof(*ipencap));
1297
1298 if (!data)
1299 return ret;
1300
1301 if (data[IFLA_GRE_ENCAP_TYPE]) {
1302 ret = true;
1303 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1304 }
1305
1306 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1307 ret = true;
1308 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1309 }
1310
1311 if (data[IFLA_GRE_ENCAP_SPORT]) {
1312 ret = true;
1313 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1314 }
1315
1316 if (data[IFLA_GRE_ENCAP_DPORT]) {
1317 ret = true;
1318 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1319 }
1320
1321 return ret;
1322}
1323
c12b395a 1324static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1325 struct nlattr *tb[], struct nlattr *data[])
1326{
1327 struct ip6_tnl *nt;
1328 struct net *net = dev_net(dev);
1329 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1faf3d9f 1330 struct ip_tunnel_encap ipencap;
c12b395a 1331 int err;
1332
1333 nt = netdev_priv(dev);
1faf3d9f
TH		 1334
1335 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1336 int err = ip6_tnl_encap_setup(nt, &ipencap);
1337
1338 if (err < 0)
1339 return err;
1340 }
1341
c12b395a 1342 ip6gre_netlink_parms(data, &nt->parms);
1343
1344 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1345 return -EEXIST;
1346
1347 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1348 eth_hw_addr_random(dev);
1349
1350 nt->dev = dev;
0bd87628 1351 nt->net = dev_net(dev);
c12b395a 1352 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1353
ac4eb009
AD		 1354 dev->features |= GRE6_FEATURES;
1355 dev->hw_features |= GRE6_FEATURES;
1356
b45bd1d7 1357 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
6a553681
AD		 1358 /* TCP offload with GRE SEQ is not supported, nor
1359 * can we support 2 levels of outer headers requiring
1360 * an update.
3a80e1fa 1361 */
6a553681
AD		 1362 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1363 (nt->encap.type == TUNNEL_ENCAP_NONE)) {
1364 dev->features |= NETIF_F_GSO_SOFTWARE;
1365 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1366 }
3a80e1fa
AD		 1367
1368 /* Can use a lockless transmit, unless we generate
1369 * output sequences
1370 */
c12b395a 1371 dev->features |= NETIF_F_LLTX;
3a80e1fa 1372 }
c12b395a 1373
1374 err = register_netdevice(dev);
1375 if (err)
1376 goto out;
1377
1378 dev_hold(dev);
1379 ip6gre_tunnel_link(ign, nt);
1380
1381out:
1382 return err;
1383}
1384
1385static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1386 struct nlattr *data[])
1387{
22f08069
ND		 1388 struct ip6_tnl *t, *nt = netdev_priv(dev);
1389 struct net *net = nt->net;
c12b395a 1390 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1391 struct __ip6_tnl_parm p;
1faf3d9f 1392 struct ip_tunnel_encap ipencap;
c12b395a 1393
1394 if (dev == ign->fb_tunnel_dev)
1395 return -EINVAL;
1396
1faf3d9f
TH		 1397 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1398 int err = ip6_tnl_encap_setup(nt, &ipencap);
1399
1400 if (err < 0)
1401 return err;
1402 }
1403
c12b395a 1404 ip6gre_netlink_parms(data, &p);
1405
1406 t = ip6gre_tunnel_locate(net, &p, 0);
1407
1408 if (t) {
1409 if (t->dev != dev)
1410 return -EEXIST;
1411 } else {
1412 t = nt;
c12b395a 1413 }
1414
6a61d4db
ND		 1415 ip6gre_tunnel_unlink(ign, t);
1416 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1417 ip6gre_tunnel_link(ign, t);
c12b395a 1418 return 0;
1419}
1420
54d63f78
ND		 1421static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
1422{
1423 struct net *net = dev_net(dev);
1424 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1425
1426 if (dev != ign->fb_tunnel_dev)
1427 unregister_netdevice_queue(dev, head);
1428}
1429
c12b395a 1430static size_t ip6gre_get_size(const struct net_device *dev)
1431{
1432 return
1433 /* IFLA_GRE_LINK */
1434 nla_total_size(4) +
1435 /* IFLA_GRE_IFLAGS */
1436 nla_total_size(2) +
1437 /* IFLA_GRE_OFLAGS */
1438 nla_total_size(2) +
1439 /* IFLA_GRE_IKEY */
1440 nla_total_size(4) +
1441 /* IFLA_GRE_OKEY */
1442 nla_total_size(4) +
1443 /* IFLA_GRE_LOCAL */
a3754133 1444 nla_total_size(sizeof(struct in6_addr)) +
c12b395a 1445 /* IFLA_GRE_REMOTE */
a3754133 1446 nla_total_size(sizeof(struct in6_addr)) +
c12b395a 1447 /* IFLA_GRE_TTL */
1448 nla_total_size(1) +
c12b395a 1449 /* IFLA_GRE_ENCAP_LIMIT */
1450 nla_total_size(1) +
1451 /* IFLA_GRE_FLOWINFO */
1452 nla_total_size(4) +
1453 /* IFLA_GRE_FLAGS */
1454 nla_total_size(4) +
1faf3d9f
TH		 1455 /* IFLA_GRE_ENCAP_TYPE */
1456 nla_total_size(2) +
1457 /* IFLA_GRE_ENCAP_FLAGS */
1458 nla_total_size(2) +
1459 /* IFLA_GRE_ENCAP_SPORT */
1460 nla_total_size(2) +
1461 /* IFLA_GRE_ENCAP_DPORT */
1462 nla_total_size(2) +
c12b395a 1463 0;
1464}
1465
1466static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1467{
1468 struct ip6_tnl *t = netdev_priv(dev);
1469 struct __ip6_tnl_parm *p = &t->parms;
1470
1471 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
f41fe3c2
TH		 1472 nla_put_be16(skb, IFLA_GRE_IFLAGS,
1473 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
1474 nla_put_be16(skb, IFLA_GRE_OFLAGS,
1475 gre_tnl_flags_to_gre_flags(p->o_flags)) ||
c12b395a 1476 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1477 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
930345ea
JB		 1478 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
1479 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
c12b395a 1480 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
c12b395a 1481 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1482 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1483 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags))
1484 goto nla_put_failure;
1faf3d9f
TH		 1485
1486 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
1487 t->encap.type) ||
1488 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
1489 t->encap.sport) ||
1490 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
1491 t->encap.dport) ||
1492 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
1493 t->encap.flags))
1494 goto nla_put_failure;
1495
c12b395a 1496 return 0;
1497
1498nla_put_failure:
1499 return -EMSGSIZE;
1500}
1501
1502static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1503 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1504 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1505 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1506 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1507 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1508 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1509 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1510 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1511 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1512 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1513 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1faf3d9f
TH		 1514 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
1515 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
1516 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
1517 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
c12b395a 1518};
1519
1520static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1521 .kind = "ip6gre",
1522 .maxtype = IFLA_GRE_MAX,
1523 .policy = ip6gre_policy,
1524 .priv_size = sizeof(struct ip6_tnl),
1525 .setup = ip6gre_tunnel_setup,
1526 .validate = ip6gre_tunnel_validate,
1527 .newlink = ip6gre_newlink,
1528 .changelink = ip6gre_changelink,
54d63f78 1529 .dellink = ip6gre_dellink,
c12b395a 1530 .get_size = ip6gre_get_size,
1531 .fill_info = ip6gre_fill_info,
1728d4fa 1532 .get_link_net = ip6_tnl_get_link_net,
c12b395a 1533};
1534
1535static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1536 .kind = "ip6gretap",
1537 .maxtype = IFLA_GRE_MAX,
1538 .policy = ip6gre_policy,
1539 .priv_size = sizeof(struct ip6_tnl),
1540 .setup = ip6gre_tap_setup,
1541 .validate = ip6gre_tap_validate,
1542 .newlink = ip6gre_newlink,
1543 .changelink = ip6gre_changelink,
1544 .get_size = ip6gre_get_size,
1545 .fill_info = ip6gre_fill_info,
3390e397 1546 .get_link_net = ip6_tnl_get_link_net,
c12b395a 1547};
1548
1549/*
1550 * And now the modules code and kernel interface.
1551 */
1552
1553static int __init ip6gre_init(void)
1554{
1555 int err;
1556
1557 pr_info("GRE over IPv6 tunneling driver\n");
1558
1559 err = register_pernet_device(&ip6gre_net_ops);
1560 if (err < 0)
1561 return err;
1562
1563 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1564 if (err < 0) {
1565 pr_info("%s: can't add protocol\n", __func__);
1566 goto add_proto_failed;
1567 }
1568
1569 err = rtnl_link_register(&ip6gre_link_ops);
1570 if (err < 0)
1571 goto rtnl_link_failed;
1572
1573 err = rtnl_link_register(&ip6gre_tap_ops);
1574 if (err < 0)
1575 goto tap_ops_failed;
1576
1577out:
1578 return err;
1579
1580tap_ops_failed:
1581 rtnl_link_unregister(&ip6gre_link_ops);
1582rtnl_link_failed:
1583 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1584add_proto_failed:
1585 unregister_pernet_device(&ip6gre_net_ops);
1586 goto out;
1587}
1588
1589static void __exit ip6gre_fini(void)
1590{
1591 rtnl_link_unregister(&ip6gre_tap_ops);
1592 rtnl_link_unregister(&ip6gre_link_ops);
1593 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1594 unregister_pernet_device(&ip6gre_net_ops);
1595}
1596
1597module_init(ip6gre_init);
1598module_exit(ip6gre_fini);
1599MODULE_LICENSE("GPL");
1600MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1601MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1602MODULE_ALIAS_RTNL_LINK("ip6gre");
5a4ee9a9 1603MODULE_ALIAS_RTNL_LINK("ip6gretap");
c12b395a 1604MODULE_ALIAS_NETDEV("ip6gre0");
Linux kernel - Deliverables
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