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Merge branches 'acpi-resources', 'acpi-battery', 'acpi-doc' and 'acpi-pnp'
[linux-2.6-block.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>
27#include <linux/mroute.h>
28#include <linux/init.h>
29#include <linux/in6.h>
30#include <linux/inetdevice.h>
31#include <linux/igmp.h>
32#include <linux/netfilter_ipv4.h>
33#include <linux/etherdevice.h>
34#include <linux/if_ether.h>
35#include <linux/hash.h>
36#include <linux/if_tunnel.h>
37#include <linux/ip6_tunnel.h>
38
39#include <net/sock.h>
40#include <net/ip.h>
c5441932 41#include <net/ip_tunnels.h>
c12b395a 42#include <net/icmp.h>
43#include <net/protocol.h>
44#include <net/addrconf.h>
45#include <net/arp.h>
46#include <net/checksum.h>
47#include <net/dsfield.h>
48#include <net/inet_ecn.h>
49#include <net/xfrm.h>
50#include <net/net_namespace.h>
51#include <net/netns/generic.h>
52#include <net/rtnetlink.h>
53
54#include <net/ipv6.h>
55#include <net/ip6_fib.h>
56#include <net/ip6_route.h>
57#include <net/ip6_tunnel.h>
58
59
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 */
346 if (!(nt->parms.o_flags & GRE_SEQ))
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);
c12b395a 364 dev_put(dev);
365}
366
367
368static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
369 u8 type, u8 code, int offset, __be32 info)
370{
371 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
b87fb39e
ED		 372 __be16 *p = (__be16 *)(skb->data + offset);
373 int grehlen = offset + 4;
c12b395a 374 struct ip6_tnl *t;
375 __be16 flags;
376
377 flags = p[0];
378 if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) {
379 if (flags&(GRE_VERSION|GRE_ROUTING))
380 return;
381 if (flags&GRE_KEY) {
382 grehlen += 4;
383 if (flags&GRE_CSUM)
384 grehlen += 4;
385 }
386 }
387
388 /* If only 8 bytes returned, keyed message will be dropped here */
b87fb39e 389 if (!pskb_may_pull(skb, grehlen))
c12b395a 390 return;
b87fb39e
ED		 391 ipv6h = (const struct ipv6hdr *)skb->data;
392 p = (__be16 *)(skb->data + offset);
c12b395a 393
c12b395a 394 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
395 flags & GRE_KEY ?
396 *(((__be32 *)p) + (grehlen / 4) - 1) : 0,
397 p[1]);
63159f29 398 if (!t)
0c5794a6 399 return;
c12b395a 400
401 switch (type) {
402 __u32 teli;
403 struct ipv6_tlv_tnl_enc_lim *tel;
404 __u32 mtu;
405 case ICMPV6_DEST_UNREACH:
406 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
407 t->parms.name);
408 break;
409 case ICMPV6_TIME_EXCEED:
410 if (code == ICMPV6_EXC_HOPLIMIT) {
411 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
412 t->parms.name);
413 }
414 break;
415 case ICMPV6_PARAMPROB:
416 teli = 0;
417 if (code == ICMPV6_HDR_FIELD)
418 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
419
d1e158e2 420 if (teli && teli == be32_to_cpu(info) - 2) {
c12b395a 421 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
422 if (tel->encap_limit == 0) {
423 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
424 t->parms.name);
425 }
426 } else {
427 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
428 t->parms.name);
429 }
430 break;
431 case ICMPV6_PKT_TOOBIG:
d1e158e2 432 mtu = be32_to_cpu(info) - offset;
c12b395a 433 if (mtu < IPV6_MIN_MTU)
434 mtu = IPV6_MIN_MTU;
435 t->dev->mtu = mtu;
436 break;
437 }
438
439 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
440 t->err_count++;
441 else
442 t->err_count = 1;
443 t->err_time = jiffies;
c12b395a 444}
445
c12b395a 446static int ip6gre_rcv(struct sk_buff *skb)
447{
448 const struct ipv6hdr *ipv6h;
449 u8 *h;
450 __be16 flags;
451 __sum16 csum = 0;
452 __be32 key = 0;
453 u32 seqno = 0;
454 struct ip6_tnl *tunnel;
455 int offset = 4;
456 __be16 gre_proto;
eccc1bb8 457 int err;
c12b395a 458
459 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
0c5794a6 460 goto drop;
c12b395a 461
462 ipv6h = ipv6_hdr(skb);
463 h = skb->data;
464 flags = *(__be16 *)h;
465
466 if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) {
467 /* - Version must be 0.
468 - We do not support routing headers.
469 */
470 if (flags&(GRE_VERSION|GRE_ROUTING))
0c5794a6 471 goto drop;
c12b395a 472
473 if (flags&GRE_CSUM) {
81249bea 474 csum = skb_checksum_simple_validate(skb);
c12b395a 475 offset += 4;
476 }
477 if (flags&GRE_KEY) {
478 key = *(__be32 *)(h + offset);
479 offset += 4;
480 }
481 if (flags&GRE_SEQ) {
482 seqno = ntohl(*(__be32 *)(h + offset));
483 offset += 4;
484 }
485 }
486
487 gre_proto = *(__be16 *)(h + 2);
488
c12b395a 489 tunnel = ip6gre_tunnel_lookup(skb->dev,
490 &ipv6h->saddr, &ipv6h->daddr, key,
491 gre_proto);
492 if (tunnel) {
8f84985f 493 struct pcpu_sw_netstats *tstats;
c12b395a 494
495 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
496 goto drop;
497
498 if (!ip6_tnl_rcv_ctl(tunnel, &ipv6h->daddr, &ipv6h->saddr)) {
499 tunnel->dev->stats.rx_dropped++;
500 goto drop;
501 }
502
c12b395a 503 skb->protocol = gre_proto;
504 /* WCCP version 1 and 2 protocol decoding.
be6572fd 505 * - Change protocol to IPv6
c12b395a 506 * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
507 */
508 if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) {
be6572fd 509 skb->protocol = htons(ETH_P_IPV6);
c12b395a 510 if ((*(h + offset) & 0xF0) != 0x40)
511 offset += 4;
512 }
513
514 skb->mac_header = skb->network_header;
515 __pskb_pull(skb, offset);
516 skb_postpull_rcsum(skb, skb_transport_header(skb), offset);
c12b395a 517
518 if (((flags&GRE_CSUM) && csum) ||
519 (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) {
520 tunnel->dev->stats.rx_crc_errors++;
521 tunnel->dev->stats.rx_errors++;
522 goto drop;
523 }
524 if (tunnel->parms.i_flags&GRE_SEQ) {
525 if (!(flags&GRE_SEQ) ||
526 (tunnel->i_seqno &&
527 (s32)(seqno - tunnel->i_seqno) < 0)) {
528 tunnel->dev->stats.rx_fifo_errors++;
529 tunnel->dev->stats.rx_errors++;
530 goto drop;
531 }
532 tunnel->i_seqno = seqno + 1;
533 }
534
535 /* Warning: All skb pointers will be invalidated! */
536 if (tunnel->dev->type == ARPHRD_ETHER) {
537 if (!pskb_may_pull(skb, ETH_HLEN)) {
538 tunnel->dev->stats.rx_length_errors++;
539 tunnel->dev->stats.rx_errors++;
540 goto drop;
541 }
542
543 ipv6h = ipv6_hdr(skb);
544 skb->protocol = eth_type_trans(skb, tunnel->dev);
545 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
546 }
547
ea23192e 548 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
eccc1bb8 549
550 skb_reset_network_header(skb);
551
552 err = IP6_ECN_decapsulate(ipv6h, skb);
553 if (unlikely(err)) {
554 if (log_ecn_error)
555 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
556 &ipv6h->saddr,
557 ipv6_get_dsfield(ipv6h));
558 if (err > 1) {
559 ++tunnel->dev->stats.rx_frame_errors;
560 ++tunnel->dev->stats.rx_errors;
561 goto drop;
562 }
563 }
564
c12b395a 565 tstats = this_cpu_ptr(tunnel->dev->tstats);
566 u64_stats_update_begin(&tstats->syncp);
567 tstats->rx_packets++;
568 tstats->rx_bytes += skb->len;
569 u64_stats_update_end(&tstats->syncp);
570
c12b395a 571 netif_rx(skb);
572
c12b395a 573 return 0;
574 }
575 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
576
577drop:
c12b395a 578 kfree_skb(skb);
579 return 0;
580}
581
582struct ipv6_tel_txoption {
583 struct ipv6_txoptions ops;
584 __u8 dst_opt[8];
585};
586
587static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
588{
589 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
590
591 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
592 opt->dst_opt[3] = 1;
593 opt->dst_opt[4] = encap_limit;
594 opt->dst_opt[5] = IPV6_TLV_PADN;
595 opt->dst_opt[6] = 1;
596
597 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
598 opt->ops.opt_nflen = 8;
599}
600
601static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
602 struct net_device *dev,
603 __u8 dsfield,
604 struct flowi6 *fl6,
605 int encap_limit,
606 __u32 *pmtu)
607{
c12b395a 608 struct ip6_tnl *tunnel = netdev_priv(dev);
22f08069 609 struct net *net = tunnel->net;
c12b395a 610 struct net_device *tdev; /* Device to other host */
611 struct ipv6hdr *ipv6h; /* Our new IP header */
3da812d8 612 unsigned int max_headroom = 0; /* The extra header space needed */
c12b395a 613 int gre_hlen;
614 struct ipv6_tel_txoption opt;
615 int mtu;
616 struct dst_entry *dst = NULL, *ndst = NULL;
617 struct net_device_stats *stats = &tunnel->dev->stats;
618 int err = -1;
619 u8 proto;
c12b395a 620 struct sk_buff *new_skb;
54bc9bac 621 __be16 protocol;
c12b395a 622
623 if (dev->type == ARPHRD_ETHER)
624 IPCB(skb)->flags = 0;
625
626 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) {
627 gre_hlen = 0;
628 ipv6h = (struct ipv6hdr *)skb->data;
629 fl6->daddr = ipv6h->daddr;
630 } else {
631 gre_hlen = tunnel->hlen;
632 fl6->daddr = tunnel->parms.raddr;
633 }
634
635 if (!fl6->flowi6_mark)
636 dst = ip6_tnl_dst_check(tunnel);
637
638 if (!dst) {
639 ndst = ip6_route_output(net, NULL, fl6);
640
641 if (ndst->error)
642 goto tx_err_link_failure;
643 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
644 if (IS_ERR(ndst)) {
645 err = PTR_ERR(ndst);
646 ndst = NULL;
647 goto tx_err_link_failure;
648 }
649 dst = ndst;
650 }
651
652 tdev = dst->dev;
653
654 if (tdev == dev) {
655 stats->collisions++;
656 net_warn_ratelimited("%s: Local routing loop detected!\n",
657 tunnel->parms.name);
658 goto tx_err_dst_release;
659 }
660
661 mtu = dst_mtu(dst) - sizeof(*ipv6h);
662 if (encap_limit >= 0) {
663 max_headroom += 8;
664 mtu -= 8;
665 }
666 if (mtu < IPV6_MIN_MTU)
667 mtu = IPV6_MIN_MTU;
668 if (skb_dst(skb))
669 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
670 if (skb->len > mtu) {
671 *pmtu = mtu;
672 err = -EMSGSIZE;
673 goto tx_err_dst_release;
674 }
675
676 if (tunnel->err_count > 0) {
677 if (time_before(jiffies,
678 tunnel->err_time + IP6TUNNEL_ERR_TIMEO)) {
679 tunnel->err_count--;
680
681 dst_link_failure(skb);
682 } else
683 tunnel->err_count = 0;
684 }
685
963a88b3
ND		 686 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
687
3da812d8 688 max_headroom += LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len;
c12b395a 689
690 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
691 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
692 new_skb = skb_realloc_headroom(skb, max_headroom);
693 if (max_headroom > dev->needed_headroom)
694 dev->needed_headroom = max_headroom;
695 if (!new_skb)
696 goto tx_err_dst_release;
697
698 if (skb->sk)
699 skb_set_owner_w(new_skb, skb->sk);
700 consume_skb(skb);
701 skb = new_skb;
702 }
703
c12b395a 704 if (fl6->flowi6_mark) {
705 skb_dst_set(skb, dst);
706 ndst = NULL;
707 } else {
708 skb_dst_set_noref(skb, dst);
709 }
710
c12b395a 711 proto = NEXTHDR_GRE;
712 if (encap_limit >= 0) {
713 init_tel_txopt(&opt, encap_limit);
714 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
715 }
716
3d483058
HFS		 717 if (likely(!skb->encapsulation)) {
718 skb_reset_inner_headers(skb);
719 skb->encapsulation = 1;
720 }
721
c12b395a 722 skb_push(skb, gre_hlen);
723 skb_reset_network_header(skb);
ae782bb1 724 skb_set_transport_header(skb, sizeof(*ipv6h));
c12b395a 725
726 /*
727 * Push down and install the IP header.
728 */
729 ipv6h = ipv6_hdr(skb);
cb1ce2ef
TH		 730 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield),
731 ip6_make_flowlabel(net, skb, fl6->flowlabel, false));
c12b395a 732 ipv6h->hop_limit = tunnel->parms.hop_limit;
733 ipv6h->nexthdr = proto;
734 ipv6h->saddr = fl6->saddr;
735 ipv6h->daddr = fl6->daddr;
736
737 ((__be16 *)(ipv6h + 1))[0] = tunnel->parms.o_flags;
54bc9bac
TH		 738 protocol = (dev->type == ARPHRD_ETHER) ?
739 htons(ETH_P_TEB) : skb->protocol;
740 ((__be16 *)(ipv6h + 1))[1] = protocol;
c12b395a 741
742 if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) {
743 __be32 *ptr = (__be32 *)(((u8 *)ipv6h) + tunnel->hlen - 4);
744
745 if (tunnel->parms.o_flags&GRE_SEQ) {
746 ++tunnel->o_seqno;
747 *ptr = htonl(tunnel->o_seqno);
748 ptr--;
749 }
750 if (tunnel->parms.o_flags&GRE_KEY) {
751 *ptr = tunnel->parms.o_key;
752 ptr--;
753 }
754 if (tunnel->parms.o_flags&GRE_CSUM) {
755 *ptr = 0;
756 *(__sum16 *)ptr = ip_compute_csum((void *)(ipv6h+1),
757 skb->len - sizeof(struct ipv6hdr));
758 }
759 }
760
54bc9bac
TH		 761 skb_set_inner_protocol(skb, protocol);
762
79b16aad 763 ip6tunnel_xmit(NULL, skb, dev);
c12b395a 764 if (ndst)
765 ip6_tnl_dst_store(tunnel, ndst);
c12b395a 766 return 0;
767tx_err_link_failure:
768 stats->tx_carrier_errors++;
769 dst_link_failure(skb);
770tx_err_dst_release:
771 dst_release(ndst);
772 return err;
773}
774
775static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
776{
777 struct ip6_tnl *t = netdev_priv(dev);
778 const struct iphdr *iph = ip_hdr(skb);
779 int encap_limit = -1;
780 struct flowi6 fl6;
781 __u8 dsfield;
782 __u32 mtu;
783 int err;
784
785 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
786 encap_limit = t->parms.encap_limit;
787
788 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
3be07244 789 fl6.flowi6_proto = IPPROTO_GRE;
c12b395a 790
791 dsfield = ipv4_get_dsfield(iph);
792
793 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
794 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
795 & IPV6_TCLASS_MASK;
796 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
797 fl6.flowi6_mark = skb->mark;
798
799 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
800 if (err != 0) {
801 /* XXX: send ICMP error even if DF is not set. */
802 if (err == -EMSGSIZE)
803 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
804 htonl(mtu));
805 return -1;
806 }
807
808 return 0;
809}
810
811static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
812{
813 struct ip6_tnl *t = netdev_priv(dev);
814 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
815 int encap_limit = -1;
816 __u16 offset;
817 struct flowi6 fl6;
818 __u8 dsfield;
819 __u32 mtu;
820 int err;
821
822 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
823 return -1;
824
825 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
826 if (offset > 0) {
827 struct ipv6_tlv_tnl_enc_lim *tel;
828 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
829 if (tel->encap_limit == 0) {
830 icmpv6_send(skb, ICMPV6_PARAMPROB,
831 ICMPV6_HDR_FIELD, offset + 2);
832 return -1;
833 }
834 encap_limit = tel->encap_limit - 1;
835 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
836 encap_limit = t->parms.encap_limit;
837
838 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
3be07244 839 fl6.flowi6_proto = IPPROTO_GRE;
c12b395a 840
841 dsfield = ipv6_get_dsfield(ipv6h);
842 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
843 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
844 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
3308de2b 845 fl6.flowlabel |= ip6_flowlabel(ipv6h);
c12b395a 846 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
847 fl6.flowi6_mark = skb->mark;
848
849 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
850 if (err != 0) {
851 if (err == -EMSGSIZE)
852 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
853 return -1;
854 }
855
856 return 0;
857}
858
859/**
860 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
861 * @t: the outgoing tunnel device
862 * @hdr: IPv6 header from the incoming packet
863 *
864 * Description:
865 * Avoid trivial tunneling loop by checking that tunnel exit-point
866 * doesn't match source of incoming packet.
867 *
868 * Return:
869 * 1 if conflict,
870 * 0 else
871 **/
872
873static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
874 const struct ipv6hdr *hdr)
875{
876 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
877}
878
879static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
880{
881 struct ip6_tnl *t = netdev_priv(dev);
882 int encap_limit = -1;
883 struct flowi6 fl6;
884 __u32 mtu;
885 int err;
886
887 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
888 encap_limit = t->parms.encap_limit;
889
890 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
891 fl6.flowi6_proto = skb->protocol;
892
893 err = ip6gre_xmit2(skb, dev, 0, &fl6, encap_limit, &mtu);
894
895 return err;
896}
897
898static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
899 struct net_device *dev)
900{
901 struct ip6_tnl *t = netdev_priv(dev);
902 struct net_device_stats *stats = &t->dev->stats;
903 int ret;
904
d5005140 905 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
41ab3e31 906 goto tx_err;
c12b395a 907
908 switch (skb->protocol) {
909 case htons(ETH_P_IP):
910 ret = ip6gre_xmit_ipv4(skb, dev);
911 break;
912 case htons(ETH_P_IPV6):
913 ret = ip6gre_xmit_ipv6(skb, dev);
914 break;
915 default:
916 ret = ip6gre_xmit_other(skb, dev);
917 break;
918 }
919
920 if (ret < 0)
921 goto tx_err;
922
923 return NETDEV_TX_OK;
924
925tx_err:
926 stats->tx_errors++;
927 stats->tx_dropped++;
928 kfree_skb(skb);
929 return NETDEV_TX_OK;
930}
931
932static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
933{
934 struct net_device *dev = t->dev;
935 struct __ip6_tnl_parm *p = &t->parms;
936 struct flowi6 *fl6 = &t->fl.u.ip6;
937 int addend = sizeof(struct ipv6hdr) + 4;
938
939 if (dev->type != ARPHRD_ETHER) {
940 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
941 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
942 }
943
944 /* Set up flowi template */
945 fl6->saddr = p->laddr;
946 fl6->daddr = p->raddr;
947 fl6->flowi6_oif = p->link;
948 fl6->flowlabel = 0;
949
950 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
951 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
952 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
953 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
954
955 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
956 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
957
958 if (p->flags&IP6_TNL_F_CAP_XMIT &&
959 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
960 dev->flags |= IFF_POINTOPOINT;
961 else
962 dev->flags &= ~IFF_POINTOPOINT;
963
c12b395a 964 /* Precalculate GRE options length */
965 if (t->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) {
966 if (t->parms.o_flags&GRE_CSUM)
967 addend += 4;
968 if (t->parms.o_flags&GRE_KEY)
969 addend += 4;
970 if (t->parms.o_flags&GRE_SEQ)
971 addend += 4;
972 }
bf581759 973 t->hlen = addend;
c12b395a 974
975 if (p->flags & IP6_TNL_F_CAP_XMIT) {
976 int strict = (ipv6_addr_type(&p->raddr) &
977 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
978
22f08069 979 struct rt6_info *rt = rt6_lookup(t->net,
c12b395a 980 &p->raddr, &p->laddr,
981 p->link, strict);
982
63159f29 983 if (!rt)
c12b395a 984 return;
985
986 if (rt->dst.dev) {
987 dev->hard_header_len = rt->dst.dev->hard_header_len + addend;
988
989 if (set_mtu) {
990 dev->mtu = rt->dst.dev->mtu - addend;
991 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
992 dev->mtu -= 8;
993
994 if (dev->mtu < IPV6_MIN_MTU)
995 dev->mtu = IPV6_MIN_MTU;
996 }
997 }
94e187c0 998 ip6_rt_put(rt);
c12b395a 999 }
c12b395a 1000}
1001
1002static int ip6gre_tnl_change(struct ip6_tnl *t,
1003 const struct __ip6_tnl_parm *p, int set_mtu)
1004{
1005 t->parms.laddr = p->laddr;
1006 t->parms.raddr = p->raddr;
1007 t->parms.flags = p->flags;
1008 t->parms.hop_limit = p->hop_limit;
1009 t->parms.encap_limit = p->encap_limit;
1010 t->parms.flowinfo = p->flowinfo;
1011 t->parms.link = p->link;
1012 t->parms.proto = p->proto;
1013 t->parms.i_key = p->i_key;
1014 t->parms.o_key = p->o_key;
1015 t->parms.i_flags = p->i_flags;
1016 t->parms.o_flags = p->o_flags;
1017 ip6_tnl_dst_reset(t);
1018 ip6gre_tnl_link_config(t, set_mtu);
1019 return 0;
1020}
1021
1022static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1023 const struct ip6_tnl_parm2 *u)
1024{
1025 p->laddr = u->laddr;
1026 p->raddr = u->raddr;
1027 p->flags = u->flags;
1028 p->hop_limit = u->hop_limit;
1029 p->encap_limit = u->encap_limit;
1030 p->flowinfo = u->flowinfo;
1031 p->link = u->link;
1032 p->i_key = u->i_key;
1033 p->o_key = u->o_key;
1034 p->i_flags = u->i_flags;
1035 p->o_flags = u->o_flags;
1036 memcpy(p->name, u->name, sizeof(u->name));
1037}
1038
1039static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1040 const struct __ip6_tnl_parm *p)
1041{
1042 u->proto = IPPROTO_GRE;
1043 u->laddr = p->laddr;
1044 u->raddr = p->raddr;
1045 u->flags = p->flags;
1046 u->hop_limit = p->hop_limit;
1047 u->encap_limit = p->encap_limit;
1048 u->flowinfo = p->flowinfo;
1049 u->link = p->link;
1050 u->i_key = p->i_key;
1051 u->o_key = p->o_key;
1052 u->i_flags = p->i_flags;
1053 u->o_flags = p->o_flags;
1054 memcpy(u->name, p->name, sizeof(u->name));
1055}
1056
1057static int ip6gre_tunnel_ioctl(struct net_device *dev,
1058 struct ifreq *ifr, int cmd)
1059{
1060 int err = 0;
1061 struct ip6_tnl_parm2 p;
1062 struct __ip6_tnl_parm p1;
22f08069
ND		 1063 struct ip6_tnl *t = netdev_priv(dev);
1064 struct net *net = t->net;
c12b395a 1065 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1066
1067 switch (cmd) {
1068 case SIOCGETTUNNEL:
c12b395a 1069 if (dev == ign->fb_tunnel_dev) {
1070 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1071 err = -EFAULT;
1072 break;
1073 }
1074 ip6gre_tnl_parm_from_user(&p1, &p);
1075 t = ip6gre_tunnel_locate(net, &p1, 0);
63159f29 1076 if (!t)
22f08069 1077 t = netdev_priv(dev);
c12b395a 1078 }
5dbd5068 1079 memset(&p, 0, sizeof(p));
c12b395a 1080 ip6gre_tnl_parm_to_user(&p, &t->parms);
1081 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1082 err = -EFAULT;
1083 break;
1084
1085 case SIOCADDTUNNEL:
1086 case SIOCCHGTUNNEL:
1087 err = -EPERM;
af31f412 1088 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
c12b395a 1089 goto done;
1090
1091 err = -EFAULT;
1092 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1093 goto done;
1094
1095 err = -EINVAL;
1096 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1097 goto done;
1098
1099 if (!(p.i_flags&GRE_KEY))
1100 p.i_key = 0;
1101 if (!(p.o_flags&GRE_KEY))
1102 p.o_key = 0;
1103
1104 ip6gre_tnl_parm_from_user(&p1, &p);
1105 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1106
1107 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
53b24b8f 1108 if (t) {
c12b395a 1109 if (t->dev != dev) {
1110 err = -EEXIST;
1111 break;
1112 }
1113 } else {
1114 t = netdev_priv(dev);
1115
1116 ip6gre_tunnel_unlink(ign, t);
1117 synchronize_net();
1118 ip6gre_tnl_change(t, &p1, 1);
1119 ip6gre_tunnel_link(ign, t);
1120 netdev_state_change(dev);
1121 }
1122 }
1123
1124 if (t) {
1125 err = 0;
1126
5dbd5068 1127 memset(&p, 0, sizeof(p));
c12b395a 1128 ip6gre_tnl_parm_to_user(&p, &t->parms);
1129 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1130 err = -EFAULT;
1131 } else
1132 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1133 break;
1134
1135 case SIOCDELTUNNEL:
1136 err = -EPERM;
af31f412 1137 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
c12b395a 1138 goto done;
1139
1140 if (dev == ign->fb_tunnel_dev) {
1141 err = -EFAULT;
1142 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1143 goto done;
1144 err = -ENOENT;
1145 ip6gre_tnl_parm_from_user(&p1, &p);
1146 t = ip6gre_tunnel_locate(net, &p1, 0);
63159f29 1147 if (!t)
c12b395a 1148 goto done;
1149 err = -EPERM;
1150 if (t == netdev_priv(ign->fb_tunnel_dev))
1151 goto done;
1152 dev = t->dev;
1153 }
1154 unregister_netdevice(dev);
1155 err = 0;
1156 break;
1157
1158 default:
1159 err = -EINVAL;
1160 }
1161
1162done:
1163 return err;
1164}
1165
1166static int ip6gre_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1167{
c12b395a 1168 if (new_mtu < 68 ||
0e719e3a 1169 new_mtu > 0xFFF8 - dev->hard_header_len)
c12b395a 1170 return -EINVAL;
1171 dev->mtu = new_mtu;
1172 return 0;
1173}
1174
1175static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1176 unsigned short type,
1177 const void *daddr, const void *saddr, unsigned int len)
1178{
1179 struct ip6_tnl *t = netdev_priv(dev);
1180 struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen);
1181 __be16 *p = (__be16 *)(ipv6h+1);
1182
cb1ce2ef
TH		 1183 ip6_flow_hdr(ipv6h, 0,
1184 ip6_make_flowlabel(dev_net(dev), skb,
1185 t->fl.u.ip6.flowlabel, false));
c12b395a 1186 ipv6h->hop_limit = t->parms.hop_limit;
1187 ipv6h->nexthdr = NEXTHDR_GRE;
1188 ipv6h->saddr = t->parms.laddr;
1189 ipv6h->daddr = t->parms.raddr;
1190
1191 p[0] = t->parms.o_flags;
1192 p[1] = htons(type);
1193
1194 /*
1195 * Set the source hardware address.
1196 */
1197
1198 if (saddr)
1199 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1200 if (daddr)
1201 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1202 if (!ipv6_addr_any(&ipv6h->daddr))
1203 return t->hlen;
1204
1205 return -t->hlen;
1206}
1207
c12b395a 1208static const struct header_ops ip6gre_header_ops = {
1209 .create = ip6gre_header,
c12b395a 1210};
1211
1212static const struct net_device_ops ip6gre_netdev_ops = {
1213 .ndo_init = ip6gre_tunnel_init,
1214 .ndo_uninit = ip6gre_tunnel_uninit,
1215 .ndo_start_xmit = ip6gre_tunnel_xmit,
1216 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1217 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
f61dd388 1218 .ndo_get_stats64 = ip_tunnel_get_stats64,
ecf2c06a 1219 .ndo_get_iflink = ip6_tnl_get_iflink,
c12b395a 1220};
1221
1222static void ip6gre_dev_free(struct net_device *dev)
1223{
1224 free_percpu(dev->tstats);
1225 free_netdev(dev);
1226}
1227
1228static void ip6gre_tunnel_setup(struct net_device *dev)
1229{
1230 struct ip6_tnl *t;
1231
1232 dev->netdev_ops = &ip6gre_netdev_ops;
1233 dev->destructor = ip6gre_dev_free;
1234
1235 dev->type = ARPHRD_IP6GRE;
1236 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr) + 4;
1237 dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr) - 4;
1238 t = netdev_priv(dev);
1239 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1240 dev->mtu -= 8;
1241 dev->flags |= IFF_NOARP;
c12b395a 1242 dev->addr_len = sizeof(struct in6_addr);
02875878 1243 netif_keep_dst(dev);
c12b395a 1244}
1245
1246static int ip6gre_tunnel_init(struct net_device *dev)
1247{
1248 struct ip6_tnl *tunnel;
1249
1250 tunnel = netdev_priv(dev);
1251
1252 tunnel->dev = dev;
0bd87628 1253 tunnel->net = dev_net(dev);
c12b395a 1254 strcpy(tunnel->parms.name, dev->name);
1255
1256 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1257 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1258
1259 if (ipv6_addr_any(&tunnel->parms.raddr))
1260 dev->header_ops = &ip6gre_header_ops;
1261
26349c71 1262 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
c12b395a 1263 if (!dev->tstats)
1264 return -ENOMEM;
1265
1266 return 0;
1267}
1268
1269static void ip6gre_fb_tunnel_init(struct net_device *dev)
1270{
1271 struct ip6_tnl *tunnel = netdev_priv(dev);
1272
1273 tunnel->dev = dev;
0bd87628 1274 tunnel->net = dev_net(dev);
c12b395a 1275 strcpy(tunnel->parms.name, dev->name);
1276
1277 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1278
1279 dev_hold(dev);
1280}
1281
1282
1283static struct inet6_protocol ip6gre_protocol __read_mostly = {
1284 .handler = ip6gre_rcv,
1285 .err_handler = ip6gre_err,
1286 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1287};
1288
22f08069 1289static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
c12b395a 1290{
22f08069
ND		 1291 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1292 struct net_device *dev, *aux;
c12b395a 1293 int prio;
1294
22f08069
ND		 1295 for_each_netdev_safe(net, dev, aux)
1296 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1297 dev->rtnl_link_ops == &ip6gre_tap_ops)
1298 unregister_netdevice_queue(dev, head);
1299
c12b395a 1300 for (prio = 0; prio < 4; prio++) {
1301 int h;
1302 for (h = 0; h < HASH_SIZE; h++) {
1303 struct ip6_tnl *t;
1304
1305 t = rtnl_dereference(ign->tunnels[prio][h]);
1306
53b24b8f 1307 while (t) {
22f08069
ND		 1308 /* If dev is in the same netns, it has already
1309 * been added to the list by the previous loop.
1310 */
1311 if (!net_eq(dev_net(t->dev), net))
1312 unregister_netdevice_queue(t->dev,
1313 head);
c12b395a 1314 t = rtnl_dereference(t->next);
1315 }
1316 }
1317 }
1318}
1319
1320static int __net_init ip6gre_init_net(struct net *net)
1321{
1322 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1323 int err;
1324
1325 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
c835a677
TG		 1326 NET_NAME_UNKNOWN,
1327 ip6gre_tunnel_setup);
c12b395a 1328 if (!ign->fb_tunnel_dev) {
1329 err = -ENOMEM;
1330 goto err_alloc_dev;
1331 }
1332 dev_net_set(ign->fb_tunnel_dev, net);
22f08069
ND		 1333 /* FB netdevice is special: we have one, and only one per netns.
1334 * Allowing to move it to another netns is clearly unsafe.
1335 */
1336 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1337
c12b395a 1338
1339 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1340 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1341
1342 err = register_netdev(ign->fb_tunnel_dev);
1343 if (err)
1344 goto err_reg_dev;
1345
1346 rcu_assign_pointer(ign->tunnels_wc[0],
1347 netdev_priv(ign->fb_tunnel_dev));
1348 return 0;
1349
1350err_reg_dev:
1351 ip6gre_dev_free(ign->fb_tunnel_dev);
1352err_alloc_dev:
1353 return err;
1354}
1355
1356static void __net_exit ip6gre_exit_net(struct net *net)
1357{
c12b395a 1358 LIST_HEAD(list);
1359
c12b395a 1360 rtnl_lock();
22f08069 1361 ip6gre_destroy_tunnels(net, &list);
c12b395a 1362 unregister_netdevice_many(&list);
1363 rtnl_unlock();
1364}
1365
1366static struct pernet_operations ip6gre_net_ops = {
1367 .init = ip6gre_init_net,
1368 .exit = ip6gre_exit_net,
1369 .id = &ip6gre_net_id,
1370 .size = sizeof(struct ip6gre_net),
1371};
1372
1373static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
1374{
1375 __be16 flags;
1376
1377 if (!data)
1378 return 0;
1379
1380 flags = 0;
1381 if (data[IFLA_GRE_IFLAGS])
1382 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1383 if (data[IFLA_GRE_OFLAGS])
1384 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1385 if (flags & (GRE_VERSION|GRE_ROUTING))
1386 return -EINVAL;
1387
1388 return 0;
1389}
1390
1391static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
1392{
1393 struct in6_addr daddr;
1394
1395 if (tb[IFLA_ADDRESS]) {
1396 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1397 return -EINVAL;
1398 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1399 return -EADDRNOTAVAIL;
1400 }
1401
1402 if (!data)
1403 goto out;
1404
1405 if (data[IFLA_GRE_REMOTE]) {
67b61f6c 1406 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
c12b395a 1407 if (ipv6_addr_any(&daddr))
1408 return -EINVAL;
1409 }
1410
1411out:
1412 return ip6gre_tunnel_validate(tb, data);
1413}
1414
1415
1416static void ip6gre_netlink_parms(struct nlattr *data[],
1417 struct __ip6_tnl_parm *parms)
1418{
1419 memset(parms, 0, sizeof(*parms));
1420
1421 if (!data)
1422 return;
1423
1424 if (data[IFLA_GRE_LINK])
1425 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1426
1427 if (data[IFLA_GRE_IFLAGS])
1428 parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]);
1429
1430 if (data[IFLA_GRE_OFLAGS])
1431 parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]);
1432
1433 if (data[IFLA_GRE_IKEY])
1434 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1435
1436 if (data[IFLA_GRE_OKEY])
1437 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1438
1439 if (data[IFLA_GRE_LOCAL])
67b61f6c 1440 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
c12b395a 1441
1442 if (data[IFLA_GRE_REMOTE])
67b61f6c 1443 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
c12b395a 1444
1445 if (data[IFLA_GRE_TTL])
1446 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1447
1448 if (data[IFLA_GRE_ENCAP_LIMIT])
1449 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1450
1451 if (data[IFLA_GRE_FLOWINFO])
1452 parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]);
1453
1454 if (data[IFLA_GRE_FLAGS])
1455 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1456}
1457
1458static int ip6gre_tap_init(struct net_device *dev)
1459{
1460 struct ip6_tnl *tunnel;
1461
1462 tunnel = netdev_priv(dev);
1463
1464 tunnel->dev = dev;
0bd87628 1465 tunnel->net = dev_net(dev);
c12b395a 1466 strcpy(tunnel->parms.name, dev->name);
1467
1468 ip6gre_tnl_link_config(tunnel, 1);
1469
1c213bd2 1470 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
c12b395a 1471 if (!dev->tstats)
1472 return -ENOMEM;
1473
1474 return 0;
1475}
1476
1477static const struct net_device_ops ip6gre_tap_netdev_ops = {
1478 .ndo_init = ip6gre_tap_init,
1479 .ndo_uninit = ip6gre_tunnel_uninit,
1480 .ndo_start_xmit = ip6gre_tunnel_xmit,
1481 .ndo_set_mac_address = eth_mac_addr,
1482 .ndo_validate_addr = eth_validate_addr,
1483 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
f61dd388 1484 .ndo_get_stats64 = ip_tunnel_get_stats64,
ecf2c06a 1485 .ndo_get_iflink = ip6_tnl_get_iflink,
c12b395a 1486};
1487
1488static void ip6gre_tap_setup(struct net_device *dev)
1489{
1490
1491 ether_setup(dev);
1492
1493 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1494 dev->destructor = ip6gre_dev_free;
1495
c12b395a 1496 dev->features |= NETIF_F_NETNS_LOCAL;
1497}
1498
1499static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1500 struct nlattr *tb[], struct nlattr *data[])
1501{
1502 struct ip6_tnl *nt;
1503 struct net *net = dev_net(dev);
1504 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1505 int err;
1506
1507 nt = netdev_priv(dev);
1508 ip6gre_netlink_parms(data, &nt->parms);
1509
1510 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1511 return -EEXIST;
1512
1513 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1514 eth_hw_addr_random(dev);
1515
1516 nt->dev = dev;
0bd87628 1517 nt->net = dev_net(dev);
c12b395a 1518 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1519
1520 /* Can use a lockless transmit, unless we generate output sequences */
1521 if (!(nt->parms.o_flags & GRE_SEQ))
1522 dev->features |= NETIF_F_LLTX;
1523
1524 err = register_netdevice(dev);
1525 if (err)
1526 goto out;
1527
1528 dev_hold(dev);
1529 ip6gre_tunnel_link(ign, nt);
1530
1531out:
1532 return err;
1533}
1534
1535static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1536 struct nlattr *data[])
1537{
22f08069
ND		 1538 struct ip6_tnl *t, *nt = netdev_priv(dev);
1539 struct net *net = nt->net;
c12b395a 1540 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1541 struct __ip6_tnl_parm p;
1542
1543 if (dev == ign->fb_tunnel_dev)
1544 return -EINVAL;
1545
c12b395a 1546 ip6gre_netlink_parms(data, &p);
1547
1548 t = ip6gre_tunnel_locate(net, &p, 0);
1549
1550 if (t) {
1551 if (t->dev != dev)
1552 return -EEXIST;
1553 } else {
1554 t = nt;
1555
1556 ip6gre_tunnel_unlink(ign, t);
1557 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1558 ip6gre_tunnel_link(ign, t);
1559 netdev_state_change(dev);
1560 }
1561
1562 return 0;
1563}
1564
54d63f78
ND		 1565static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
1566{
1567 struct net *net = dev_net(dev);
1568 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1569
1570 if (dev != ign->fb_tunnel_dev)
1571 unregister_netdevice_queue(dev, head);
1572}
1573
c12b395a 1574static size_t ip6gre_get_size(const struct net_device *dev)
1575{
1576 return
1577 /* IFLA_GRE_LINK */
1578 nla_total_size(4) +
1579 /* IFLA_GRE_IFLAGS */
1580 nla_total_size(2) +
1581 /* IFLA_GRE_OFLAGS */
1582 nla_total_size(2) +
1583 /* IFLA_GRE_IKEY */
1584 nla_total_size(4) +
1585 /* IFLA_GRE_OKEY */
1586 nla_total_size(4) +
1587 /* IFLA_GRE_LOCAL */
a3754133 1588 nla_total_size(sizeof(struct in6_addr)) +
c12b395a 1589 /* IFLA_GRE_REMOTE */
a3754133 1590 nla_total_size(sizeof(struct in6_addr)) +
c12b395a 1591 /* IFLA_GRE_TTL */
1592 nla_total_size(1) +
1593 /* IFLA_GRE_TOS */
1594 nla_total_size(1) +
1595 /* IFLA_GRE_ENCAP_LIMIT */
1596 nla_total_size(1) +
1597 /* IFLA_GRE_FLOWINFO */
1598 nla_total_size(4) +
1599 /* IFLA_GRE_FLAGS */
1600 nla_total_size(4) +
1601 0;
1602}
1603
1604static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1605{
1606 struct ip6_tnl *t = netdev_priv(dev);
1607 struct __ip6_tnl_parm *p = &t->parms;
1608
1609 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1610 nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) ||
1611 nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) ||
1612 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1613 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
930345ea
JB		 1614 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
1615 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
c12b395a 1616 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1617 /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/
1618 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1619 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1620 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags))
1621 goto nla_put_failure;
1622 return 0;
1623
1624nla_put_failure:
1625 return -EMSGSIZE;
1626}
1627
1628static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1629 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1630 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1631 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1632 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1633 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1634 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1635 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1636 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1637 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1638 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1639 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1640};
1641
1642static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1643 .kind = "ip6gre",
1644 .maxtype = IFLA_GRE_MAX,
1645 .policy = ip6gre_policy,
1646 .priv_size = sizeof(struct ip6_tnl),
1647 .setup = ip6gre_tunnel_setup,
1648 .validate = ip6gre_tunnel_validate,
1649 .newlink = ip6gre_newlink,
1650 .changelink = ip6gre_changelink,
54d63f78 1651 .dellink = ip6gre_dellink,
c12b395a 1652 .get_size = ip6gre_get_size,
1653 .fill_info = ip6gre_fill_info,
1728d4fa 1654 .get_link_net = ip6_tnl_get_link_net,
c12b395a 1655};
1656
1657static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1658 .kind = "ip6gretap",
1659 .maxtype = IFLA_GRE_MAX,
1660 .policy = ip6gre_policy,
1661 .priv_size = sizeof(struct ip6_tnl),
1662 .setup = ip6gre_tap_setup,
1663 .validate = ip6gre_tap_validate,
1664 .newlink = ip6gre_newlink,
1665 .changelink = ip6gre_changelink,
1666 .get_size = ip6gre_get_size,
1667 .fill_info = ip6gre_fill_info,
3390e397 1668 .get_link_net = ip6_tnl_get_link_net,
c12b395a 1669};
1670
1671/*
1672 * And now the modules code and kernel interface.
1673 */
1674
1675static int __init ip6gre_init(void)
1676{
1677 int err;
1678
1679 pr_info("GRE over IPv6 tunneling driver\n");
1680
1681 err = register_pernet_device(&ip6gre_net_ops);
1682 if (err < 0)
1683 return err;
1684
1685 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1686 if (err < 0) {
1687 pr_info("%s: can't add protocol\n", __func__);
1688 goto add_proto_failed;
1689 }
1690
1691 err = rtnl_link_register(&ip6gre_link_ops);
1692 if (err < 0)
1693 goto rtnl_link_failed;
1694
1695 err = rtnl_link_register(&ip6gre_tap_ops);
1696 if (err < 0)
1697 goto tap_ops_failed;
1698
1699out:
1700 return err;
1701
1702tap_ops_failed:
1703 rtnl_link_unregister(&ip6gre_link_ops);
1704rtnl_link_failed:
1705 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1706add_proto_failed:
1707 unregister_pernet_device(&ip6gre_net_ops);
1708 goto out;
1709}
1710
1711static void __exit ip6gre_fini(void)
1712{
1713 rtnl_link_unregister(&ip6gre_tap_ops);
1714 rtnl_link_unregister(&ip6gre_link_ops);
1715 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1716 unregister_pernet_device(&ip6gre_net_ops);
1717}
1718
1719module_init(ip6gre_init);
1720module_exit(ip6gre_fini);
1721MODULE_LICENSE("GPL");
1722MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1723MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1724MODULE_ALIAS_RTNL_LINK("ip6gre");
5a4ee9a9 1725MODULE_ALIAS_RTNL_LINK("ip6gretap");
c12b395a 1726MODULE_ALIAS_NETDEV("ip6gre0");
Linux 6.x block layer and io_uring tree(s)