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Merge tag 'dm-4.4-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/device...
[deliverable/linux.git] / net / ipv6 / ip6_gre.c
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>
41 #include <net/ip_tunnels.h>
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
60 static bool log_ecn_error = true;
61 module_param(log_ecn_error, bool, 0644);
62 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
63
64 #define HASH_SIZE_SHIFT 5
65 #define HASH_SIZE (1 << HASH_SIZE_SHIFT)
66
67 static int ip6gre_net_id __read_mostly;
68 struct ip6gre_net {
69 struct ip6_tnl __rcu *tunnels[4][HASH_SIZE];
70
71 struct net_device *fb_tunnel_dev;
72 };
73
74 static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
75 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
76 static int ip6gre_tunnel_init(struct net_device *dev);
77 static void ip6gre_tunnel_setup(struct net_device *dev);
78 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
79 static 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))
100 static 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]
111
112 /* Given src, dst and key, find appropriate for input tunnel. */
113
114 static 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
128 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
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
153 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
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
177 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
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
203 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
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
226 if (cand)
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
236 static 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
254 static 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
260 static 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
268 static 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
283 static 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
308 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
309 const struct __ip6_tnl_parm *parms, int create)
310 {
311 struct ip6_tnl *t, *nt;
312 struct net_device *dev;
313 char name[IFNAMSIZ];
314 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
315
316 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
317 if (t && create)
318 return NULL;
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
327 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
328 ip6gre_tunnel_setup);
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;
339 nt->net = dev_net(dev);
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
353 failed_free:
354 free_netdev(dev);
355 return NULL;
356 }
357
358 static void ip6gre_tunnel_uninit(struct net_device *dev)
359 {
360 struct ip6_tnl *t = netdev_priv(dev);
361 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
362
363 ip6gre_tunnel_unlink(ign, t);
364 ip6_tnl_dst_reset(t);
365 dev_put(dev);
366 }
367
368
369 static 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;
373 __be16 *p = (__be16 *)(skb->data + offset);
374 int grehlen = offset + 4;
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 */
390 if (!pskb_may_pull(skb, grehlen))
391 return;
392 ipv6h = (const struct ipv6hdr *)skb->data;
393 p = (__be16 *)(skb->data + offset);
394
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]);
399 if (!t)
400 return;
401
402 switch (type) {
403 __u32 teli;
404 struct ipv6_tlv_tnl_enc_lim *tel;
405 __u32 mtu;
406 case ICMPV6_DEST_UNREACH:
407 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
408 t->parms.name);
409 break;
410 case ICMPV6_TIME_EXCEED:
411 if (code == ICMPV6_EXC_HOPLIMIT) {
412 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
413 t->parms.name);
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
421 if (teli && teli == be32_to_cpu(info) - 2) {
422 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
423 if (tel->encap_limit == 0) {
424 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
425 t->parms.name);
426 }
427 } else {
428 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
429 t->parms.name);
430 }
431 break;
432 case ICMPV6_PKT_TOOBIG:
433 mtu = be32_to_cpu(info) - offset;
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;
445 }
446
447 static int ip6gre_rcv(struct sk_buff *skb)
448 {
449 const struct ipv6hdr *ipv6h;
450 u8 *h;
451 __be16 flags;
452 __sum16 csum = 0;
453 __be32 key = 0;
454 u32 seqno = 0;
455 struct ip6_tnl *tunnel;
456 int offset = 4;
457 __be16 gre_proto;
458 int err;
459
460 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
461 goto drop;
462
463 ipv6h = ipv6_hdr(skb);
464 h = skb->data;
465 flags = *(__be16 *)h;
466
467 if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) {
468 /* - Version must be 0.
469 - We do not support routing headers.
470 */
471 if (flags&(GRE_VERSION|GRE_ROUTING))
472 goto drop;
473
474 if (flags&GRE_CSUM) {
475 csum = skb_checksum_simple_validate(skb);
476 offset += 4;
477 }
478 if (flags&GRE_KEY) {
479 key = *(__be32 *)(h + offset);
480 offset += 4;
481 }
482 if (flags&GRE_SEQ) {
483 seqno = ntohl(*(__be32 *)(h + offset));
484 offset += 4;
485 }
486 }
487
488 gre_proto = *(__be16 *)(h + 2);
489
490 tunnel = ip6gre_tunnel_lookup(skb->dev,
491 &ipv6h->saddr, &ipv6h->daddr, key,
492 gre_proto);
493 if (tunnel) {
494 struct pcpu_sw_netstats *tstats;
495
496 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
497 goto drop;
498
499 if (!ip6_tnl_rcv_ctl(tunnel, &ipv6h->daddr, &ipv6h->saddr)) {
500 tunnel->dev->stats.rx_dropped++;
501 goto drop;
502 }
503
504 skb->protocol = gre_proto;
505 /* WCCP version 1 and 2 protocol decoding.
506 * - Change protocol to IPv6
507 * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
508 */
509 if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) {
510 skb->protocol = htons(ETH_P_IPV6);
511 if ((*(h + offset) & 0xF0) != 0x40)
512 offset += 4;
513 }
514
515 skb->mac_header = skb->network_header;
516 __pskb_pull(skb, offset);
517 skb_postpull_rcsum(skb, skb_transport_header(skb), offset);
518
519 if (((flags&GRE_CSUM) && csum) ||
520 (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) {
521 tunnel->dev->stats.rx_crc_errors++;
522 tunnel->dev->stats.rx_errors++;
523 goto drop;
524 }
525 if (tunnel->parms.i_flags&GRE_SEQ) {
526 if (!(flags&GRE_SEQ) ||
527 (tunnel->i_seqno &&
528 (s32)(seqno - tunnel->i_seqno) < 0)) {
529 tunnel->dev->stats.rx_fifo_errors++;
530 tunnel->dev->stats.rx_errors++;
531 goto drop;
532 }
533 tunnel->i_seqno = seqno + 1;
534 }
535
536 /* Warning: All skb pointers will be invalidated! */
537 if (tunnel->dev->type == ARPHRD_ETHER) {
538 if (!pskb_may_pull(skb, ETH_HLEN)) {
539 tunnel->dev->stats.rx_length_errors++;
540 tunnel->dev->stats.rx_errors++;
541 goto drop;
542 }
543
544 ipv6h = ipv6_hdr(skb);
545 skb->protocol = eth_type_trans(skb, tunnel->dev);
546 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
547 }
548
549 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
550
551 skb_reset_network_header(skb);
552
553 err = IP6_ECN_decapsulate(ipv6h, skb);
554 if (unlikely(err)) {
555 if (log_ecn_error)
556 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
557 &ipv6h->saddr,
558 ipv6_get_dsfield(ipv6h));
559 if (err > 1) {
560 ++tunnel->dev->stats.rx_frame_errors;
561 ++tunnel->dev->stats.rx_errors;
562 goto drop;
563 }
564 }
565
566 tstats = this_cpu_ptr(tunnel->dev->tstats);
567 u64_stats_update_begin(&tstats->syncp);
568 tstats->rx_packets++;
569 tstats->rx_bytes += skb->len;
570 u64_stats_update_end(&tstats->syncp);
571
572 netif_rx(skb);
573
574 return 0;
575 }
576 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
577
578 drop:
579 kfree_skb(skb);
580 return 0;
581 }
582
583 struct ipv6_tel_txoption {
584 struct ipv6_txoptions ops;
585 __u8 dst_opt[8];
586 };
587
588 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
589 {
590 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
591
592 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
593 opt->dst_opt[3] = 1;
594 opt->dst_opt[4] = encap_limit;
595 opt->dst_opt[5] = IPV6_TLV_PADN;
596 opt->dst_opt[6] = 1;
597
598 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
599 opt->ops.opt_nflen = 8;
600 }
601
602 static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
603 struct net_device *dev,
604 __u8 dsfield,
605 struct flowi6 *fl6,
606 int encap_limit,
607 __u32 *pmtu)
608 {
609 struct ip6_tnl *tunnel = netdev_priv(dev);
610 struct net *net = tunnel->net;
611 struct net_device *tdev; /* Device to other host */
612 struct ipv6hdr *ipv6h; /* Our new IP header */
613 unsigned int max_headroom = 0; /* The extra header space needed */
614 int gre_hlen;
615 struct ipv6_tel_txoption opt;
616 int mtu;
617 struct dst_entry *dst = NULL, *ndst = NULL;
618 struct net_device_stats *stats = &tunnel->dev->stats;
619 int err = -1;
620 u8 proto;
621 struct sk_buff *new_skb;
622 __be16 protocol;
623
624 if (dev->type == ARPHRD_ETHER)
625 IPCB(skb)->flags = 0;
626
627 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) {
628 gre_hlen = 0;
629 ipv6h = (struct ipv6hdr *)skb->data;
630 fl6->daddr = ipv6h->daddr;
631 } else {
632 gre_hlen = tunnel->hlen;
633 fl6->daddr = tunnel->parms.raddr;
634 }
635
636 if (!fl6->flowi6_mark)
637 dst = ip6_tnl_dst_get(tunnel);
638
639 if (!dst) {
640 dst = ip6_route_output(net, NULL, fl6);
641
642 if (dst->error)
643 goto tx_err_link_failure;
644 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
645 if (IS_ERR(dst)) {
646 err = PTR_ERR(dst);
647 dst = NULL;
648 goto tx_err_link_failure;
649 }
650 ndst = dst;
651 }
652
653 tdev = dst->dev;
654
655 if (tdev == dev) {
656 stats->collisions++;
657 net_warn_ratelimited("%s: Local routing loop detected!\n",
658 tunnel->parms.name);
659 goto tx_err_dst_release;
660 }
661
662 mtu = dst_mtu(dst) - sizeof(*ipv6h);
663 if (encap_limit >= 0) {
664 max_headroom += 8;
665 mtu -= 8;
666 }
667 if (mtu < IPV6_MIN_MTU)
668 mtu = IPV6_MIN_MTU;
669 if (skb_dst(skb))
670 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
671 if (skb->len > mtu) {
672 *pmtu = mtu;
673 err = -EMSGSIZE;
674 goto tx_err_dst_release;
675 }
676
677 if (tunnel->err_count > 0) {
678 if (time_before(jiffies,
679 tunnel->err_time + IP6TUNNEL_ERR_TIMEO)) {
680 tunnel->err_count--;
681
682 dst_link_failure(skb);
683 } else
684 tunnel->err_count = 0;
685 }
686
687 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
688
689 max_headroom += LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len;
690
691 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
692 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
693 new_skb = skb_realloc_headroom(skb, max_headroom);
694 if (max_headroom > dev->needed_headroom)
695 dev->needed_headroom = max_headroom;
696 if (!new_skb)
697 goto tx_err_dst_release;
698
699 if (skb->sk)
700 skb_set_owner_w(new_skb, skb->sk);
701 consume_skb(skb);
702 skb = new_skb;
703 }
704
705 if (!fl6->flowi6_mark && ndst)
706 ip6_tnl_dst_set(tunnel, ndst);
707 skb_dst_set(skb, dst);
708
709 proto = NEXTHDR_GRE;
710 if (encap_limit >= 0) {
711 init_tel_txopt(&opt, encap_limit);
712 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
713 }
714
715 if (likely(!skb->encapsulation)) {
716 skb_reset_inner_headers(skb);
717 skb->encapsulation = 1;
718 }
719
720 skb_push(skb, gre_hlen);
721 skb_reset_network_header(skb);
722 skb_set_transport_header(skb, sizeof(*ipv6h));
723
724 /*
725 * Push down and install the IP header.
726 */
727 ipv6h = ipv6_hdr(skb);
728 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield),
729 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6));
730 ipv6h->hop_limit = tunnel->parms.hop_limit;
731 ipv6h->nexthdr = proto;
732 ipv6h->saddr = fl6->saddr;
733 ipv6h->daddr = fl6->daddr;
734
735 ((__be16 *)(ipv6h + 1))[0] = tunnel->parms.o_flags;
736 protocol = (dev->type == ARPHRD_ETHER) ?
737 htons(ETH_P_TEB) : skb->protocol;
738 ((__be16 *)(ipv6h + 1))[1] = protocol;
739
740 if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) {
741 __be32 *ptr = (__be32 *)(((u8 *)ipv6h) + tunnel->hlen - 4);
742
743 if (tunnel->parms.o_flags&GRE_SEQ) {
744 ++tunnel->o_seqno;
745 *ptr = htonl(tunnel->o_seqno);
746 ptr--;
747 }
748 if (tunnel->parms.o_flags&GRE_KEY) {
749 *ptr = tunnel->parms.o_key;
750 ptr--;
751 }
752 if (tunnel->parms.o_flags&GRE_CSUM) {
753 *ptr = 0;
754 *(__sum16 *)ptr = ip_compute_csum((void *)(ipv6h+1),
755 skb->len - sizeof(struct ipv6hdr));
756 }
757 }
758
759 skb_set_inner_protocol(skb, protocol);
760
761 ip6tunnel_xmit(NULL, skb, dev);
762 return 0;
763 tx_err_link_failure:
764 stats->tx_carrier_errors++;
765 dst_link_failure(skb);
766 tx_err_dst_release:
767 dst_release(dst);
768 return err;
769 }
770
771 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
772 {
773 struct ip6_tnl *t = netdev_priv(dev);
774 const struct iphdr *iph = ip_hdr(skb);
775 int encap_limit = -1;
776 struct flowi6 fl6;
777 __u8 dsfield;
778 __u32 mtu;
779 int err;
780
781 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
782 encap_limit = t->parms.encap_limit;
783
784 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
785 fl6.flowi6_proto = IPPROTO_GRE;
786
787 dsfield = ipv4_get_dsfield(iph);
788
789 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
790 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
791 & IPV6_TCLASS_MASK;
792 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
793 fl6.flowi6_mark = skb->mark;
794
795 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
796 if (err != 0) {
797 /* XXX: send ICMP error even if DF is not set. */
798 if (err == -EMSGSIZE)
799 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
800 htonl(mtu));
801 return -1;
802 }
803
804 return 0;
805 }
806
807 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
808 {
809 struct ip6_tnl *t = netdev_priv(dev);
810 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
811 int encap_limit = -1;
812 __u16 offset;
813 struct flowi6 fl6;
814 __u8 dsfield;
815 __u32 mtu;
816 int err;
817
818 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
819 return -1;
820
821 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
822 if (offset > 0) {
823 struct ipv6_tlv_tnl_enc_lim *tel;
824 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
825 if (tel->encap_limit == 0) {
826 icmpv6_send(skb, ICMPV6_PARAMPROB,
827 ICMPV6_HDR_FIELD, offset + 2);
828 return -1;
829 }
830 encap_limit = tel->encap_limit - 1;
831 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
832 encap_limit = t->parms.encap_limit;
833
834 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
835 fl6.flowi6_proto = IPPROTO_GRE;
836
837 dsfield = ipv6_get_dsfield(ipv6h);
838 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
839 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
840 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
841 fl6.flowlabel |= ip6_flowlabel(ipv6h);
842 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
843 fl6.flowi6_mark = skb->mark;
844
845 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
846 if (err != 0) {
847 if (err == -EMSGSIZE)
848 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
849 return -1;
850 }
851
852 return 0;
853 }
854
855 /**
856 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
857 * @t: the outgoing tunnel device
858 * @hdr: IPv6 header from the incoming packet
859 *
860 * Description:
861 * Avoid trivial tunneling loop by checking that tunnel exit-point
862 * doesn't match source of incoming packet.
863 *
864 * Return:
865 * 1 if conflict,
866 * 0 else
867 **/
868
869 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
870 const struct ipv6hdr *hdr)
871 {
872 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
873 }
874
875 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
876 {
877 struct ip6_tnl *t = netdev_priv(dev);
878 int encap_limit = -1;
879 struct flowi6 fl6;
880 __u32 mtu;
881 int err;
882
883 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
884 encap_limit = t->parms.encap_limit;
885
886 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
887 fl6.flowi6_proto = skb->protocol;
888
889 err = ip6gre_xmit2(skb, dev, 0, &fl6, encap_limit, &mtu);
890
891 return err;
892 }
893
894 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
895 struct net_device *dev)
896 {
897 struct ip6_tnl *t = netdev_priv(dev);
898 struct net_device_stats *stats = &t->dev->stats;
899 int ret;
900
901 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
902 goto tx_err;
903
904 switch (skb->protocol) {
905 case htons(ETH_P_IP):
906 ret = ip6gre_xmit_ipv4(skb, dev);
907 break;
908 case htons(ETH_P_IPV6):
909 ret = ip6gre_xmit_ipv6(skb, dev);
910 break;
911 default:
912 ret = ip6gre_xmit_other(skb, dev);
913 break;
914 }
915
916 if (ret < 0)
917 goto tx_err;
918
919 return NETDEV_TX_OK;
920
921 tx_err:
922 stats->tx_errors++;
923 stats->tx_dropped++;
924 kfree_skb(skb);
925 return NETDEV_TX_OK;
926 }
927
928 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
929 {
930 struct net_device *dev = t->dev;
931 struct __ip6_tnl_parm *p = &t->parms;
932 struct flowi6 *fl6 = &t->fl.u.ip6;
933 int addend = sizeof(struct ipv6hdr) + 4;
934
935 if (dev->type != ARPHRD_ETHER) {
936 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
937 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
938 }
939
940 /* Set up flowi template */
941 fl6->saddr = p->laddr;
942 fl6->daddr = p->raddr;
943 fl6->flowi6_oif = p->link;
944 fl6->flowlabel = 0;
945
946 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
947 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
948 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
949 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
950
951 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
952 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
953
954 if (p->flags&IP6_TNL_F_CAP_XMIT &&
955 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
956 dev->flags |= IFF_POINTOPOINT;
957 else
958 dev->flags &= ~IFF_POINTOPOINT;
959
960 /* Precalculate GRE options length */
961 if (t->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) {
962 if (t->parms.o_flags&GRE_CSUM)
963 addend += 4;
964 if (t->parms.o_flags&GRE_KEY)
965 addend += 4;
966 if (t->parms.o_flags&GRE_SEQ)
967 addend += 4;
968 }
969 t->hlen = addend;
970
971 if (p->flags & IP6_TNL_F_CAP_XMIT) {
972 int strict = (ipv6_addr_type(&p->raddr) &
973 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
974
975 struct rt6_info *rt = rt6_lookup(t->net,
976 &p->raddr, &p->laddr,
977 p->link, strict);
978
979 if (!rt)
980 return;
981
982 if (rt->dst.dev) {
983 dev->hard_header_len = rt->dst.dev->hard_header_len + addend;
984
985 if (set_mtu) {
986 dev->mtu = rt->dst.dev->mtu - addend;
987 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
988 dev->mtu -= 8;
989
990 if (dev->mtu < IPV6_MIN_MTU)
991 dev->mtu = IPV6_MIN_MTU;
992 }
993 }
994 ip6_rt_put(rt);
995 }
996 }
997
998 static int ip6gre_tnl_change(struct ip6_tnl *t,
999 const struct __ip6_tnl_parm *p, int set_mtu)
1000 {
1001 t->parms.laddr = p->laddr;
1002 t->parms.raddr = p->raddr;
1003 t->parms.flags = p->flags;
1004 t->parms.hop_limit = p->hop_limit;
1005 t->parms.encap_limit = p->encap_limit;
1006 t->parms.flowinfo = p->flowinfo;
1007 t->parms.link = p->link;
1008 t->parms.proto = p->proto;
1009 t->parms.i_key = p->i_key;
1010 t->parms.o_key = p->o_key;
1011 t->parms.i_flags = p->i_flags;
1012 t->parms.o_flags = p->o_flags;
1013 ip6_tnl_dst_reset(t);
1014 ip6gre_tnl_link_config(t, set_mtu);
1015 return 0;
1016 }
1017
1018 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1019 const struct ip6_tnl_parm2 *u)
1020 {
1021 p->laddr = u->laddr;
1022 p->raddr = u->raddr;
1023 p->flags = u->flags;
1024 p->hop_limit = u->hop_limit;
1025 p->encap_limit = u->encap_limit;
1026 p->flowinfo = u->flowinfo;
1027 p->link = u->link;
1028 p->i_key = u->i_key;
1029 p->o_key = u->o_key;
1030 p->i_flags = u->i_flags;
1031 p->o_flags = u->o_flags;
1032 memcpy(p->name, u->name, sizeof(u->name));
1033 }
1034
1035 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1036 const struct __ip6_tnl_parm *p)
1037 {
1038 u->proto = IPPROTO_GRE;
1039 u->laddr = p->laddr;
1040 u->raddr = p->raddr;
1041 u->flags = p->flags;
1042 u->hop_limit = p->hop_limit;
1043 u->encap_limit = p->encap_limit;
1044 u->flowinfo = p->flowinfo;
1045 u->link = p->link;
1046 u->i_key = p->i_key;
1047 u->o_key = p->o_key;
1048 u->i_flags = p->i_flags;
1049 u->o_flags = p->o_flags;
1050 memcpy(u->name, p->name, sizeof(u->name));
1051 }
1052
1053 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1054 struct ifreq *ifr, int cmd)
1055 {
1056 int err = 0;
1057 struct ip6_tnl_parm2 p;
1058 struct __ip6_tnl_parm p1;
1059 struct ip6_tnl *t = netdev_priv(dev);
1060 struct net *net = t->net;
1061 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1062
1063 switch (cmd) {
1064 case SIOCGETTUNNEL:
1065 if (dev == ign->fb_tunnel_dev) {
1066 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1067 err = -EFAULT;
1068 break;
1069 }
1070 ip6gre_tnl_parm_from_user(&p1, &p);
1071 t = ip6gre_tunnel_locate(net, &p1, 0);
1072 if (!t)
1073 t = netdev_priv(dev);
1074 }
1075 memset(&p, 0, sizeof(p));
1076 ip6gre_tnl_parm_to_user(&p, &t->parms);
1077 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1078 err = -EFAULT;
1079 break;
1080
1081 case SIOCADDTUNNEL:
1082 case SIOCCHGTUNNEL:
1083 err = -EPERM;
1084 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1085 goto done;
1086
1087 err = -EFAULT;
1088 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1089 goto done;
1090
1091 err = -EINVAL;
1092 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1093 goto done;
1094
1095 if (!(p.i_flags&GRE_KEY))
1096 p.i_key = 0;
1097 if (!(p.o_flags&GRE_KEY))
1098 p.o_key = 0;
1099
1100 ip6gre_tnl_parm_from_user(&p1, &p);
1101 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1102
1103 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1104 if (t) {
1105 if (t->dev != dev) {
1106 err = -EEXIST;
1107 break;
1108 }
1109 } else {
1110 t = netdev_priv(dev);
1111
1112 ip6gre_tunnel_unlink(ign, t);
1113 synchronize_net();
1114 ip6gre_tnl_change(t, &p1, 1);
1115 ip6gre_tunnel_link(ign, t);
1116 netdev_state_change(dev);
1117 }
1118 }
1119
1120 if (t) {
1121 err = 0;
1122
1123 memset(&p, 0, sizeof(p));
1124 ip6gre_tnl_parm_to_user(&p, &t->parms);
1125 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1126 err = -EFAULT;
1127 } else
1128 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1129 break;
1130
1131 case SIOCDELTUNNEL:
1132 err = -EPERM;
1133 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1134 goto done;
1135
1136 if (dev == ign->fb_tunnel_dev) {
1137 err = -EFAULT;
1138 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1139 goto done;
1140 err = -ENOENT;
1141 ip6gre_tnl_parm_from_user(&p1, &p);
1142 t = ip6gre_tunnel_locate(net, &p1, 0);
1143 if (!t)
1144 goto done;
1145 err = -EPERM;
1146 if (t == netdev_priv(ign->fb_tunnel_dev))
1147 goto done;
1148 dev = t->dev;
1149 }
1150 unregister_netdevice(dev);
1151 err = 0;
1152 break;
1153
1154 default:
1155 err = -EINVAL;
1156 }
1157
1158 done:
1159 return err;
1160 }
1161
1162 static int ip6gre_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1163 {
1164 if (new_mtu < 68 ||
1165 new_mtu > 0xFFF8 - dev->hard_header_len)
1166 return -EINVAL;
1167 dev->mtu = new_mtu;
1168 return 0;
1169 }
1170
1171 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1172 unsigned short type,
1173 const void *daddr, const void *saddr, unsigned int len)
1174 {
1175 struct ip6_tnl *t = netdev_priv(dev);
1176 struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen);
1177 __be16 *p = (__be16 *)(ipv6h+1);
1178
1179 ip6_flow_hdr(ipv6h, 0,
1180 ip6_make_flowlabel(dev_net(dev), skb,
1181 t->fl.u.ip6.flowlabel, true,
1182 &t->fl.u.ip6));
1183 ipv6h->hop_limit = t->parms.hop_limit;
1184 ipv6h->nexthdr = NEXTHDR_GRE;
1185 ipv6h->saddr = t->parms.laddr;
1186 ipv6h->daddr = t->parms.raddr;
1187
1188 p[0] = t->parms.o_flags;
1189 p[1] = htons(type);
1190
1191 /*
1192 * Set the source hardware address.
1193 */
1194
1195 if (saddr)
1196 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1197 if (daddr)
1198 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1199 if (!ipv6_addr_any(&ipv6h->daddr))
1200 return t->hlen;
1201
1202 return -t->hlen;
1203 }
1204
1205 static const struct header_ops ip6gre_header_ops = {
1206 .create = ip6gre_header,
1207 };
1208
1209 static const struct net_device_ops ip6gre_netdev_ops = {
1210 .ndo_init = ip6gre_tunnel_init,
1211 .ndo_uninit = ip6gre_tunnel_uninit,
1212 .ndo_start_xmit = ip6gre_tunnel_xmit,
1213 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1214 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1215 .ndo_get_stats64 = ip_tunnel_get_stats64,
1216 .ndo_get_iflink = ip6_tnl_get_iflink,
1217 };
1218
1219 static void ip6gre_dev_free(struct net_device *dev)
1220 {
1221 struct ip6_tnl *t = netdev_priv(dev);
1222
1223 ip6_tnl_dst_destroy(t);
1224 free_percpu(dev->tstats);
1225 free_netdev(dev);
1226 }
1227
1228 static 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;
1242 dev->addr_len = sizeof(struct in6_addr);
1243 netif_keep_dst(dev);
1244 }
1245
1246 static int ip6gre_tunnel_init_common(struct net_device *dev)
1247 {
1248 struct ip6_tnl *tunnel;
1249 int ret;
1250
1251 tunnel = netdev_priv(dev);
1252
1253 tunnel->dev = dev;
1254 tunnel->net = dev_net(dev);
1255 strcpy(tunnel->parms.name, dev->name);
1256
1257 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1258 if (!dev->tstats)
1259 return -ENOMEM;
1260
1261 ret = ip6_tnl_dst_init(tunnel);
1262 if (ret) {
1263 free_percpu(dev->tstats);
1264 dev->tstats = NULL;
1265 return ret;
1266 }
1267
1268 return 0;
1269 }
1270
1271 static int ip6gre_tunnel_init(struct net_device *dev)
1272 {
1273 struct ip6_tnl *tunnel;
1274 int ret;
1275
1276 ret = ip6gre_tunnel_init_common(dev);
1277 if (ret)
1278 return ret;
1279
1280 tunnel = netdev_priv(dev);
1281
1282 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1283 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1284
1285 if (ipv6_addr_any(&tunnel->parms.raddr))
1286 dev->header_ops = &ip6gre_header_ops;
1287
1288 return 0;
1289 }
1290
1291 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1292 {
1293 struct ip6_tnl *tunnel = netdev_priv(dev);
1294
1295 tunnel->dev = dev;
1296 tunnel->net = dev_net(dev);
1297 strcpy(tunnel->parms.name, dev->name);
1298
1299 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1300
1301 dev_hold(dev);
1302 }
1303
1304
1305 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1306 .handler = ip6gre_rcv,
1307 .err_handler = ip6gre_err,
1308 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1309 };
1310
1311 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1312 {
1313 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1314 struct net_device *dev, *aux;
1315 int prio;
1316
1317 for_each_netdev_safe(net, dev, aux)
1318 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1319 dev->rtnl_link_ops == &ip6gre_tap_ops)
1320 unregister_netdevice_queue(dev, head);
1321
1322 for (prio = 0; prio < 4; prio++) {
1323 int h;
1324 for (h = 0; h < HASH_SIZE; h++) {
1325 struct ip6_tnl *t;
1326
1327 t = rtnl_dereference(ign->tunnels[prio][h]);
1328
1329 while (t) {
1330 /* If dev is in the same netns, it has already
1331 * been added to the list by the previous loop.
1332 */
1333 if (!net_eq(dev_net(t->dev), net))
1334 unregister_netdevice_queue(t->dev,
1335 head);
1336 t = rtnl_dereference(t->next);
1337 }
1338 }
1339 }
1340 }
1341
1342 static int __net_init ip6gre_init_net(struct net *net)
1343 {
1344 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1345 int err;
1346
1347 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1348 NET_NAME_UNKNOWN,
1349 ip6gre_tunnel_setup);
1350 if (!ign->fb_tunnel_dev) {
1351 err = -ENOMEM;
1352 goto err_alloc_dev;
1353 }
1354 dev_net_set(ign->fb_tunnel_dev, net);
1355 /* FB netdevice is special: we have one, and only one per netns.
1356 * Allowing to move it to another netns is clearly unsafe.
1357 */
1358 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1359
1360
1361 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1362 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1363
1364 err = register_netdev(ign->fb_tunnel_dev);
1365 if (err)
1366 goto err_reg_dev;
1367
1368 rcu_assign_pointer(ign->tunnels_wc[0],
1369 netdev_priv(ign->fb_tunnel_dev));
1370 return 0;
1371
1372 err_reg_dev:
1373 ip6gre_dev_free(ign->fb_tunnel_dev);
1374 err_alloc_dev:
1375 return err;
1376 }
1377
1378 static void __net_exit ip6gre_exit_net(struct net *net)
1379 {
1380 LIST_HEAD(list);
1381
1382 rtnl_lock();
1383 ip6gre_destroy_tunnels(net, &list);
1384 unregister_netdevice_many(&list);
1385 rtnl_unlock();
1386 }
1387
1388 static struct pernet_operations ip6gre_net_ops = {
1389 .init = ip6gre_init_net,
1390 .exit = ip6gre_exit_net,
1391 .id = &ip6gre_net_id,
1392 .size = sizeof(struct ip6gre_net),
1393 };
1394
1395 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
1396 {
1397 __be16 flags;
1398
1399 if (!data)
1400 return 0;
1401
1402 flags = 0;
1403 if (data[IFLA_GRE_IFLAGS])
1404 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1405 if (data[IFLA_GRE_OFLAGS])
1406 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1407 if (flags & (GRE_VERSION|GRE_ROUTING))
1408 return -EINVAL;
1409
1410 return 0;
1411 }
1412
1413 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
1414 {
1415 struct in6_addr daddr;
1416
1417 if (tb[IFLA_ADDRESS]) {
1418 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1419 return -EINVAL;
1420 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1421 return -EADDRNOTAVAIL;
1422 }
1423
1424 if (!data)
1425 goto out;
1426
1427 if (data[IFLA_GRE_REMOTE]) {
1428 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1429 if (ipv6_addr_any(&daddr))
1430 return -EINVAL;
1431 }
1432
1433 out:
1434 return ip6gre_tunnel_validate(tb, data);
1435 }
1436
1437
1438 static void ip6gre_netlink_parms(struct nlattr *data[],
1439 struct __ip6_tnl_parm *parms)
1440 {
1441 memset(parms, 0, sizeof(*parms));
1442
1443 if (!data)
1444 return;
1445
1446 if (data[IFLA_GRE_LINK])
1447 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1448
1449 if (data[IFLA_GRE_IFLAGS])
1450 parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]);
1451
1452 if (data[IFLA_GRE_OFLAGS])
1453 parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]);
1454
1455 if (data[IFLA_GRE_IKEY])
1456 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1457
1458 if (data[IFLA_GRE_OKEY])
1459 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1460
1461 if (data[IFLA_GRE_LOCAL])
1462 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1463
1464 if (data[IFLA_GRE_REMOTE])
1465 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1466
1467 if (data[IFLA_GRE_TTL])
1468 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1469
1470 if (data[IFLA_GRE_ENCAP_LIMIT])
1471 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1472
1473 if (data[IFLA_GRE_FLOWINFO])
1474 parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]);
1475
1476 if (data[IFLA_GRE_FLAGS])
1477 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1478 }
1479
1480 static int ip6gre_tap_init(struct net_device *dev)
1481 {
1482 struct ip6_tnl *tunnel;
1483 int ret;
1484
1485 ret = ip6gre_tunnel_init_common(dev);
1486 if (ret)
1487 return ret;
1488
1489 tunnel = netdev_priv(dev);
1490
1491 ip6gre_tnl_link_config(tunnel, 1);
1492
1493 return 0;
1494 }
1495
1496 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1497 .ndo_init = ip6gre_tap_init,
1498 .ndo_uninit = ip6gre_tunnel_uninit,
1499 .ndo_start_xmit = ip6gre_tunnel_xmit,
1500 .ndo_set_mac_address = eth_mac_addr,
1501 .ndo_validate_addr = eth_validate_addr,
1502 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1503 .ndo_get_stats64 = ip_tunnel_get_stats64,
1504 .ndo_get_iflink = ip6_tnl_get_iflink,
1505 };
1506
1507 static void ip6gre_tap_setup(struct net_device *dev)
1508 {
1509
1510 ether_setup(dev);
1511
1512 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1513 dev->destructor = ip6gre_dev_free;
1514
1515 dev->features |= NETIF_F_NETNS_LOCAL;
1516 }
1517
1518 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1519 struct nlattr *tb[], struct nlattr *data[])
1520 {
1521 struct ip6_tnl *nt;
1522 struct net *net = dev_net(dev);
1523 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1524 int err;
1525
1526 nt = netdev_priv(dev);
1527 ip6gre_netlink_parms(data, &nt->parms);
1528
1529 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1530 return -EEXIST;
1531
1532 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1533 eth_hw_addr_random(dev);
1534
1535 nt->dev = dev;
1536 nt->net = dev_net(dev);
1537 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1538
1539 /* Can use a lockless transmit, unless we generate output sequences */
1540 if (!(nt->parms.o_flags & GRE_SEQ))
1541 dev->features |= NETIF_F_LLTX;
1542
1543 err = register_netdevice(dev);
1544 if (err)
1545 goto out;
1546
1547 dev_hold(dev);
1548 ip6gre_tunnel_link(ign, nt);
1549
1550 out:
1551 return err;
1552 }
1553
1554 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1555 struct nlattr *data[])
1556 {
1557 struct ip6_tnl *t, *nt = netdev_priv(dev);
1558 struct net *net = nt->net;
1559 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1560 struct __ip6_tnl_parm p;
1561
1562 if (dev == ign->fb_tunnel_dev)
1563 return -EINVAL;
1564
1565 ip6gre_netlink_parms(data, &p);
1566
1567 t = ip6gre_tunnel_locate(net, &p, 0);
1568
1569 if (t) {
1570 if (t->dev != dev)
1571 return -EEXIST;
1572 } else {
1573 t = nt;
1574
1575 ip6gre_tunnel_unlink(ign, t);
1576 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1577 ip6gre_tunnel_link(ign, t);
1578 netdev_state_change(dev);
1579 }
1580
1581 return 0;
1582 }
1583
1584 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
1585 {
1586 struct net *net = dev_net(dev);
1587 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1588
1589 if (dev != ign->fb_tunnel_dev)
1590 unregister_netdevice_queue(dev, head);
1591 }
1592
1593 static size_t ip6gre_get_size(const struct net_device *dev)
1594 {
1595 return
1596 /* IFLA_GRE_LINK */
1597 nla_total_size(4) +
1598 /* IFLA_GRE_IFLAGS */
1599 nla_total_size(2) +
1600 /* IFLA_GRE_OFLAGS */
1601 nla_total_size(2) +
1602 /* IFLA_GRE_IKEY */
1603 nla_total_size(4) +
1604 /* IFLA_GRE_OKEY */
1605 nla_total_size(4) +
1606 /* IFLA_GRE_LOCAL */
1607 nla_total_size(sizeof(struct in6_addr)) +
1608 /* IFLA_GRE_REMOTE */
1609 nla_total_size(sizeof(struct in6_addr)) +
1610 /* IFLA_GRE_TTL */
1611 nla_total_size(1) +
1612 /* IFLA_GRE_TOS */
1613 nla_total_size(1) +
1614 /* IFLA_GRE_ENCAP_LIMIT */
1615 nla_total_size(1) +
1616 /* IFLA_GRE_FLOWINFO */
1617 nla_total_size(4) +
1618 /* IFLA_GRE_FLAGS */
1619 nla_total_size(4) +
1620 0;
1621 }
1622
1623 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1624 {
1625 struct ip6_tnl *t = netdev_priv(dev);
1626 struct __ip6_tnl_parm *p = &t->parms;
1627
1628 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1629 nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) ||
1630 nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) ||
1631 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1632 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
1633 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
1634 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
1635 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1636 /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/
1637 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1638 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1639 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags))
1640 goto nla_put_failure;
1641 return 0;
1642
1643 nla_put_failure:
1644 return -EMSGSIZE;
1645 }
1646
1647 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1648 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1649 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1650 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1651 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1652 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1653 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1654 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1655 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1656 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1657 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1658 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1659 };
1660
1661 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1662 .kind = "ip6gre",
1663 .maxtype = IFLA_GRE_MAX,
1664 .policy = ip6gre_policy,
1665 .priv_size = sizeof(struct ip6_tnl),
1666 .setup = ip6gre_tunnel_setup,
1667 .validate = ip6gre_tunnel_validate,
1668 .newlink = ip6gre_newlink,
1669 .changelink = ip6gre_changelink,
1670 .dellink = ip6gre_dellink,
1671 .get_size = ip6gre_get_size,
1672 .fill_info = ip6gre_fill_info,
1673 .get_link_net = ip6_tnl_get_link_net,
1674 };
1675
1676 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1677 .kind = "ip6gretap",
1678 .maxtype = IFLA_GRE_MAX,
1679 .policy = ip6gre_policy,
1680 .priv_size = sizeof(struct ip6_tnl),
1681 .setup = ip6gre_tap_setup,
1682 .validate = ip6gre_tap_validate,
1683 .newlink = ip6gre_newlink,
1684 .changelink = ip6gre_changelink,
1685 .get_size = ip6gre_get_size,
1686 .fill_info = ip6gre_fill_info,
1687 .get_link_net = ip6_tnl_get_link_net,
1688 };
1689
1690 /*
1691 * And now the modules code and kernel interface.
1692 */
1693
1694 static int __init ip6gre_init(void)
1695 {
1696 int err;
1697
1698 pr_info("GRE over IPv6 tunneling driver\n");
1699
1700 err = register_pernet_device(&ip6gre_net_ops);
1701 if (err < 0)
1702 return err;
1703
1704 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1705 if (err < 0) {
1706 pr_info("%s: can't add protocol\n", __func__);
1707 goto add_proto_failed;
1708 }
1709
1710 err = rtnl_link_register(&ip6gre_link_ops);
1711 if (err < 0)
1712 goto rtnl_link_failed;
1713
1714 err = rtnl_link_register(&ip6gre_tap_ops);
1715 if (err < 0)
1716 goto tap_ops_failed;
1717
1718 out:
1719 return err;
1720
1721 tap_ops_failed:
1722 rtnl_link_unregister(&ip6gre_link_ops);
1723 rtnl_link_failed:
1724 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1725 add_proto_failed:
1726 unregister_pernet_device(&ip6gre_net_ops);
1727 goto out;
1728 }
1729
1730 static void __exit ip6gre_fini(void)
1731 {
1732 rtnl_link_unregister(&ip6gre_tap_ops);
1733 rtnl_link_unregister(&ip6gre_link_ops);
1734 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1735 unregister_pernet_device(&ip6gre_net_ops);
1736 }
1737
1738 module_init(ip6gre_init);
1739 module_exit(ip6gre_fini);
1740 MODULE_LICENSE("GPL");
1741 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1742 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1743 MODULE_ALIAS_RTNL_LINK("ip6gre");
1744 MODULE_ALIAS_RTNL_LINK("ip6gretap");
1745 MODULE_ALIAS_NETDEV("ip6gre0");
Linux kernel - Deliverables
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