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Merge branch 'for-3.16' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata
[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 int ip6gre_tunnel_init(struct net_device *dev);
76 static void ip6gre_tunnel_setup(struct net_device *dev);
77 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
78 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
79
80 /* Tunnel hash table */
81
82 /*
83 4 hash tables:
84
85 3: (remote,local)
86 2: (remote,*)
87 1: (*,local)
88 0: (*,*)
89
90 We require exact key match i.e. if a key is present in packet
91 it will match only tunnel with the same key; if it is not present,
92 it will match only keyless tunnel.
93
94 All keysless packets, if not matched configured keyless tunnels
95 will match fallback tunnel.
96 */
97
98 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(HASH_SIZE - 1))
99 static u32 HASH_ADDR(const struct in6_addr *addr)
100 {
101 u32 hash = ipv6_addr_hash(addr);
102
103 return hash_32(hash, HASH_SIZE_SHIFT);
104 }
105
106 #define tunnels_r_l tunnels[3]
107 #define tunnels_r tunnels[2]
108 #define tunnels_l tunnels[1]
109 #define tunnels_wc tunnels[0]
110
111 /* Given src, dst and key, find appropriate for input tunnel. */
112
113 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
114 const struct in6_addr *remote, const struct in6_addr *local,
115 __be32 key, __be16 gre_proto)
116 {
117 struct net *net = dev_net(dev);
118 int link = dev->ifindex;
119 unsigned int h0 = HASH_ADDR(remote);
120 unsigned int h1 = HASH_KEY(key);
121 struct ip6_tnl *t, *cand = NULL;
122 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
123 int dev_type = (gre_proto == htons(ETH_P_TEB)) ?
124 ARPHRD_ETHER : ARPHRD_IP6GRE;
125 int score, cand_score = 4;
126
127 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
128 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
129 !ipv6_addr_equal(remote, &t->parms.raddr) ||
130 key != t->parms.i_key ||
131 !(t->dev->flags & IFF_UP))
132 continue;
133
134 if (t->dev->type != ARPHRD_IP6GRE &&
135 t->dev->type != dev_type)
136 continue;
137
138 score = 0;
139 if (t->parms.link != link)
140 score |= 1;
141 if (t->dev->type != dev_type)
142 score |= 2;
143 if (score == 0)
144 return t;
145
146 if (score < cand_score) {
147 cand = t;
148 cand_score = score;
149 }
150 }
151
152 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
153 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
154 key != t->parms.i_key ||
155 !(t->dev->flags & IFF_UP))
156 continue;
157
158 if (t->dev->type != ARPHRD_IP6GRE &&
159 t->dev->type != dev_type)
160 continue;
161
162 score = 0;
163 if (t->parms.link != link)
164 score |= 1;
165 if (t->dev->type != dev_type)
166 score |= 2;
167 if (score == 0)
168 return t;
169
170 if (score < cand_score) {
171 cand = t;
172 cand_score = score;
173 }
174 }
175
176 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
177 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
178 (!ipv6_addr_equal(local, &t->parms.raddr) ||
179 !ipv6_addr_is_multicast(local))) ||
180 key != t->parms.i_key ||
181 !(t->dev->flags & IFF_UP))
182 continue;
183
184 if (t->dev->type != ARPHRD_IP6GRE &&
185 t->dev->type != dev_type)
186 continue;
187
188 score = 0;
189 if (t->parms.link != link)
190 score |= 1;
191 if (t->dev->type != dev_type)
192 score |= 2;
193 if (score == 0)
194 return t;
195
196 if (score < cand_score) {
197 cand = t;
198 cand_score = score;
199 }
200 }
201
202 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
203 if (t->parms.i_key != key ||
204 !(t->dev->flags & IFF_UP))
205 continue;
206
207 if (t->dev->type != ARPHRD_IP6GRE &&
208 t->dev->type != dev_type)
209 continue;
210
211 score = 0;
212 if (t->parms.link != link)
213 score |= 1;
214 if (t->dev->type != dev_type)
215 score |= 2;
216 if (score == 0)
217 return t;
218
219 if (score < cand_score) {
220 cand = t;
221 cand_score = score;
222 }
223 }
224
225 if (cand != NULL)
226 return cand;
227
228 dev = ign->fb_tunnel_dev;
229 if (dev->flags & IFF_UP)
230 return netdev_priv(dev);
231
232 return NULL;
233 }
234
235 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
236 const struct __ip6_tnl_parm *p)
237 {
238 const struct in6_addr *remote = &p->raddr;
239 const struct in6_addr *local = &p->laddr;
240 unsigned int h = HASH_KEY(p->i_key);
241 int prio = 0;
242
243 if (!ipv6_addr_any(local))
244 prio |= 1;
245 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
246 prio |= 2;
247 h ^= HASH_ADDR(remote);
248 }
249
250 return &ign->tunnels[prio][h];
251 }
252
253 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
254 const struct ip6_tnl *t)
255 {
256 return __ip6gre_bucket(ign, &t->parms);
257 }
258
259 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
260 {
261 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
262
263 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
264 rcu_assign_pointer(*tp, t);
265 }
266
267 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
268 {
269 struct ip6_tnl __rcu **tp;
270 struct ip6_tnl *iter;
271
272 for (tp = ip6gre_bucket(ign, t);
273 (iter = rtnl_dereference(*tp)) != NULL;
274 tp = &iter->next) {
275 if (t == iter) {
276 rcu_assign_pointer(*tp, t->next);
277 break;
278 }
279 }
280 }
281
282 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
283 const struct __ip6_tnl_parm *parms,
284 int type)
285 {
286 const struct in6_addr *remote = &parms->raddr;
287 const struct in6_addr *local = &parms->laddr;
288 __be32 key = parms->i_key;
289 int link = parms->link;
290 struct ip6_tnl *t;
291 struct ip6_tnl __rcu **tp;
292 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
293
294 for (tp = __ip6gre_bucket(ign, parms);
295 (t = rtnl_dereference(*tp)) != NULL;
296 tp = &t->next)
297 if (ipv6_addr_equal(local, &t->parms.laddr) &&
298 ipv6_addr_equal(remote, &t->parms.raddr) &&
299 key == t->parms.i_key &&
300 link == t->parms.link &&
301 type == t->dev->type)
302 break;
303
304 return t;
305 }
306
307 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
308 const struct __ip6_tnl_parm *parms, int create)
309 {
310 struct ip6_tnl *t, *nt;
311 struct net_device *dev;
312 char name[IFNAMSIZ];
313 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
314
315 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
316 if (t || !create)
317 return t;
318
319 if (parms->name[0])
320 strlcpy(name, parms->name, IFNAMSIZ);
321 else
322 strcpy(name, "ip6gre%d");
323
324 dev = alloc_netdev(sizeof(*t), name, ip6gre_tunnel_setup);
325 if (!dev)
326 return NULL;
327
328 dev_net_set(dev, net);
329
330 nt = netdev_priv(dev);
331 nt->parms = *parms;
332 dev->rtnl_link_ops = &ip6gre_link_ops;
333
334 nt->dev = dev;
335 nt->net = dev_net(dev);
336 ip6gre_tnl_link_config(nt, 1);
337
338 if (register_netdevice(dev) < 0)
339 goto failed_free;
340
341 /* Can use a lockless transmit, unless we generate output sequences */
342 if (!(nt->parms.o_flags & GRE_SEQ))
343 dev->features |= NETIF_F_LLTX;
344
345 dev_hold(dev);
346 ip6gre_tunnel_link(ign, nt);
347 return nt;
348
349 failed_free:
350 free_netdev(dev);
351 return NULL;
352 }
353
354 static void ip6gre_tunnel_uninit(struct net_device *dev)
355 {
356 struct net *net = dev_net(dev);
357 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
358
359 ip6gre_tunnel_unlink(ign, netdev_priv(dev));
360 dev_put(dev);
361 }
362
363
364 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
365 u8 type, u8 code, int offset, __be32 info)
366 {
367 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
368 __be16 *p = (__be16 *)(skb->data + offset);
369 int grehlen = offset + 4;
370 struct ip6_tnl *t;
371 __be16 flags;
372
373 flags = p[0];
374 if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) {
375 if (flags&(GRE_VERSION|GRE_ROUTING))
376 return;
377 if (flags&GRE_KEY) {
378 grehlen += 4;
379 if (flags&GRE_CSUM)
380 grehlen += 4;
381 }
382 }
383
384 /* If only 8 bytes returned, keyed message will be dropped here */
385 if (!pskb_may_pull(skb, grehlen))
386 return;
387 ipv6h = (const struct ipv6hdr *)skb->data;
388 p = (__be16 *)(skb->data + offset);
389
390 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
391 flags & GRE_KEY ?
392 *(((__be32 *)p) + (grehlen / 4) - 1) : 0,
393 p[1]);
394 if (t == NULL)
395 return;
396
397 switch (type) {
398 __u32 teli;
399 struct ipv6_tlv_tnl_enc_lim *tel;
400 __u32 mtu;
401 case ICMPV6_DEST_UNREACH:
402 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
403 t->parms.name);
404 break;
405 case ICMPV6_TIME_EXCEED:
406 if (code == ICMPV6_EXC_HOPLIMIT) {
407 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
408 t->parms.name);
409 }
410 break;
411 case ICMPV6_PARAMPROB:
412 teli = 0;
413 if (code == ICMPV6_HDR_FIELD)
414 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
415
416 if (teli && teli == info - 2) {
417 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
418 if (tel->encap_limit == 0) {
419 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
420 t->parms.name);
421 }
422 } else {
423 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
424 t->parms.name);
425 }
426 break;
427 case ICMPV6_PKT_TOOBIG:
428 mtu = info - offset;
429 if (mtu < IPV6_MIN_MTU)
430 mtu = IPV6_MIN_MTU;
431 t->dev->mtu = mtu;
432 break;
433 }
434
435 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
436 t->err_count++;
437 else
438 t->err_count = 1;
439 t->err_time = jiffies;
440 }
441
442 static int ip6gre_rcv(struct sk_buff *skb)
443 {
444 const struct ipv6hdr *ipv6h;
445 u8 *h;
446 __be16 flags;
447 __sum16 csum = 0;
448 __be32 key = 0;
449 u32 seqno = 0;
450 struct ip6_tnl *tunnel;
451 int offset = 4;
452 __be16 gre_proto;
453 int err;
454
455 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
456 goto drop;
457
458 ipv6h = ipv6_hdr(skb);
459 h = skb->data;
460 flags = *(__be16 *)h;
461
462 if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) {
463 /* - Version must be 0.
464 - We do not support routing headers.
465 */
466 if (flags&(GRE_VERSION|GRE_ROUTING))
467 goto drop;
468
469 if (flags&GRE_CSUM) {
470 switch (skb->ip_summed) {
471 case CHECKSUM_COMPLETE:
472 csum = csum_fold(skb->csum);
473 if (!csum)
474 break;
475 /* fall through */
476 case CHECKSUM_NONE:
477 skb->csum = 0;
478 csum = __skb_checksum_complete(skb);
479 skb->ip_summed = CHECKSUM_COMPLETE;
480 }
481 offset += 4;
482 }
483 if (flags&GRE_KEY) {
484 key = *(__be32 *)(h + offset);
485 offset += 4;
486 }
487 if (flags&GRE_SEQ) {
488 seqno = ntohl(*(__be32 *)(h + offset));
489 offset += 4;
490 }
491 }
492
493 gre_proto = *(__be16 *)(h + 2);
494
495 tunnel = ip6gre_tunnel_lookup(skb->dev,
496 &ipv6h->saddr, &ipv6h->daddr, key,
497 gre_proto);
498 if (tunnel) {
499 struct pcpu_sw_netstats *tstats;
500
501 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
502 goto drop;
503
504 if (!ip6_tnl_rcv_ctl(tunnel, &ipv6h->daddr, &ipv6h->saddr)) {
505 tunnel->dev->stats.rx_dropped++;
506 goto drop;
507 }
508
509 skb->protocol = gre_proto;
510 /* WCCP version 1 and 2 protocol decoding.
511 * - Change protocol to IP
512 * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
513 */
514 if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) {
515 skb->protocol = htons(ETH_P_IP);
516 if ((*(h + offset) & 0xF0) != 0x40)
517 offset += 4;
518 }
519
520 skb->mac_header = skb->network_header;
521 __pskb_pull(skb, offset);
522 skb_postpull_rcsum(skb, skb_transport_header(skb), offset);
523
524 if (((flags&GRE_CSUM) && csum) ||
525 (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) {
526 tunnel->dev->stats.rx_crc_errors++;
527 tunnel->dev->stats.rx_errors++;
528 goto drop;
529 }
530 if (tunnel->parms.i_flags&GRE_SEQ) {
531 if (!(flags&GRE_SEQ) ||
532 (tunnel->i_seqno &&
533 (s32)(seqno - tunnel->i_seqno) < 0)) {
534 tunnel->dev->stats.rx_fifo_errors++;
535 tunnel->dev->stats.rx_errors++;
536 goto drop;
537 }
538 tunnel->i_seqno = seqno + 1;
539 }
540
541 /* Warning: All skb pointers will be invalidated! */
542 if (tunnel->dev->type == ARPHRD_ETHER) {
543 if (!pskb_may_pull(skb, ETH_HLEN)) {
544 tunnel->dev->stats.rx_length_errors++;
545 tunnel->dev->stats.rx_errors++;
546 goto drop;
547 }
548
549 ipv6h = ipv6_hdr(skb);
550 skb->protocol = eth_type_trans(skb, tunnel->dev);
551 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
552 }
553
554 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
555
556 skb_reset_network_header(skb);
557
558 err = IP6_ECN_decapsulate(ipv6h, skb);
559 if (unlikely(err)) {
560 if (log_ecn_error)
561 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
562 &ipv6h->saddr,
563 ipv6_get_dsfield(ipv6h));
564 if (err > 1) {
565 ++tunnel->dev->stats.rx_frame_errors;
566 ++tunnel->dev->stats.rx_errors;
567 goto drop;
568 }
569 }
570
571 tstats = this_cpu_ptr(tunnel->dev->tstats);
572 u64_stats_update_begin(&tstats->syncp);
573 tstats->rx_packets++;
574 tstats->rx_bytes += skb->len;
575 u64_stats_update_end(&tstats->syncp);
576
577 netif_rx(skb);
578
579 return 0;
580 }
581 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
582
583 drop:
584 kfree_skb(skb);
585 return 0;
586 }
587
588 struct ipv6_tel_txoption {
589 struct ipv6_txoptions ops;
590 __u8 dst_opt[8];
591 };
592
593 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
594 {
595 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
596
597 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
598 opt->dst_opt[3] = 1;
599 opt->dst_opt[4] = encap_limit;
600 opt->dst_opt[5] = IPV6_TLV_PADN;
601 opt->dst_opt[6] = 1;
602
603 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
604 opt->ops.opt_nflen = 8;
605 }
606
607 static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
608 struct net_device *dev,
609 __u8 dsfield,
610 struct flowi6 *fl6,
611 int encap_limit,
612 __u32 *pmtu)
613 {
614 struct net *net = dev_net(dev);
615 struct ip6_tnl *tunnel = netdev_priv(dev);
616 struct net_device *tdev; /* Device to other host */
617 struct ipv6hdr *ipv6h; /* Our new IP header */
618 unsigned int max_headroom = 0; /* The extra header space needed */
619 int gre_hlen;
620 struct ipv6_tel_txoption opt;
621 int mtu;
622 struct dst_entry *dst = NULL, *ndst = NULL;
623 struct net_device_stats *stats = &tunnel->dev->stats;
624 int err = -1;
625 u8 proto;
626 struct sk_buff *new_skb;
627
628 if (dev->type == ARPHRD_ETHER)
629 IPCB(skb)->flags = 0;
630
631 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) {
632 gre_hlen = 0;
633 ipv6h = (struct ipv6hdr *)skb->data;
634 fl6->daddr = ipv6h->daddr;
635 } else {
636 gre_hlen = tunnel->hlen;
637 fl6->daddr = tunnel->parms.raddr;
638 }
639
640 if (!fl6->flowi6_mark)
641 dst = ip6_tnl_dst_check(tunnel);
642
643 if (!dst) {
644 ndst = ip6_route_output(net, NULL, fl6);
645
646 if (ndst->error)
647 goto tx_err_link_failure;
648 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
649 if (IS_ERR(ndst)) {
650 err = PTR_ERR(ndst);
651 ndst = NULL;
652 goto tx_err_link_failure;
653 }
654 dst = ndst;
655 }
656
657 tdev = dst->dev;
658
659 if (tdev == dev) {
660 stats->collisions++;
661 net_warn_ratelimited("%s: Local routing loop detected!\n",
662 tunnel->parms.name);
663 goto tx_err_dst_release;
664 }
665
666 mtu = dst_mtu(dst) - sizeof(*ipv6h);
667 if (encap_limit >= 0) {
668 max_headroom += 8;
669 mtu -= 8;
670 }
671 if (mtu < IPV6_MIN_MTU)
672 mtu = IPV6_MIN_MTU;
673 if (skb_dst(skb))
674 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
675 if (skb->len > mtu) {
676 *pmtu = mtu;
677 err = -EMSGSIZE;
678 goto tx_err_dst_release;
679 }
680
681 if (tunnel->err_count > 0) {
682 if (time_before(jiffies,
683 tunnel->err_time + IP6TUNNEL_ERR_TIMEO)) {
684 tunnel->err_count--;
685
686 dst_link_failure(skb);
687 } else
688 tunnel->err_count = 0;
689 }
690
691 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
692
693 max_headroom += LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len;
694
695 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
696 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
697 new_skb = skb_realloc_headroom(skb, max_headroom);
698 if (max_headroom > dev->needed_headroom)
699 dev->needed_headroom = max_headroom;
700 if (!new_skb)
701 goto tx_err_dst_release;
702
703 if (skb->sk)
704 skb_set_owner_w(new_skb, skb->sk);
705 consume_skb(skb);
706 skb = new_skb;
707 }
708
709 if (fl6->flowi6_mark) {
710 skb_dst_set(skb, dst);
711 ndst = NULL;
712 } else {
713 skb_dst_set_noref(skb, dst);
714 }
715
716 proto = NEXTHDR_GRE;
717 if (encap_limit >= 0) {
718 init_tel_txopt(&opt, encap_limit);
719 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
720 }
721
722 if (likely(!skb->encapsulation)) {
723 skb_reset_inner_headers(skb);
724 skb->encapsulation = 1;
725 }
726
727 skb_push(skb, gre_hlen);
728 skb_reset_network_header(skb);
729 skb_set_transport_header(skb, sizeof(*ipv6h));
730
731 /*
732 * Push down and install the IP header.
733 */
734 ipv6h = ipv6_hdr(skb);
735 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), fl6->flowlabel);
736 ipv6h->hop_limit = tunnel->parms.hop_limit;
737 ipv6h->nexthdr = proto;
738 ipv6h->saddr = fl6->saddr;
739 ipv6h->daddr = fl6->daddr;
740
741 ((__be16 *)(ipv6h + 1))[0] = tunnel->parms.o_flags;
742 ((__be16 *)(ipv6h + 1))[1] = (dev->type == ARPHRD_ETHER) ?
743 htons(ETH_P_TEB) : skb->protocol;
744
745 if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) {
746 __be32 *ptr = (__be32 *)(((u8 *)ipv6h) + tunnel->hlen - 4);
747
748 if (tunnel->parms.o_flags&GRE_SEQ) {
749 ++tunnel->o_seqno;
750 *ptr = htonl(tunnel->o_seqno);
751 ptr--;
752 }
753 if (tunnel->parms.o_flags&GRE_KEY) {
754 *ptr = tunnel->parms.o_key;
755 ptr--;
756 }
757 if (tunnel->parms.o_flags&GRE_CSUM) {
758 *ptr = 0;
759 *(__sum16 *)ptr = ip_compute_csum((void *)(ipv6h+1),
760 skb->len - sizeof(struct ipv6hdr));
761 }
762 }
763
764 ip6tunnel_xmit(skb, dev);
765 if (ndst)
766 ip6_tnl_dst_store(tunnel, ndst);
767 return 0;
768 tx_err_link_failure:
769 stats->tx_carrier_errors++;
770 dst_link_failure(skb);
771 tx_err_dst_release:
772 dst_release(ndst);
773 return err;
774 }
775
776 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
777 {
778 struct ip6_tnl *t = netdev_priv(dev);
779 const struct iphdr *iph = ip_hdr(skb);
780 int encap_limit = -1;
781 struct flowi6 fl6;
782 __u8 dsfield;
783 __u32 mtu;
784 int err;
785
786 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
787 encap_limit = t->parms.encap_limit;
788
789 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
790 fl6.flowi6_proto = IPPROTO_IPIP;
791
792 dsfield = ipv4_get_dsfield(iph);
793
794 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
795 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
796 & IPV6_TCLASS_MASK;
797 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
798 fl6.flowi6_mark = skb->mark;
799
800 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
801 if (err != 0) {
802 /* XXX: send ICMP error even if DF is not set. */
803 if (err == -EMSGSIZE)
804 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
805 htonl(mtu));
806 return -1;
807 }
808
809 return 0;
810 }
811
812 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
813 {
814 struct ip6_tnl *t = netdev_priv(dev);
815 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
816 int encap_limit = -1;
817 __u16 offset;
818 struct flowi6 fl6;
819 __u8 dsfield;
820 __u32 mtu;
821 int err;
822
823 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
824 return -1;
825
826 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
827 if (offset > 0) {
828 struct ipv6_tlv_tnl_enc_lim *tel;
829 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
830 if (tel->encap_limit == 0) {
831 icmpv6_send(skb, ICMPV6_PARAMPROB,
832 ICMPV6_HDR_FIELD, offset + 2);
833 return -1;
834 }
835 encap_limit = tel->encap_limit - 1;
836 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
837 encap_limit = t->parms.encap_limit;
838
839 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
840 fl6.flowi6_proto = IPPROTO_IPV6;
841
842 dsfield = ipv6_get_dsfield(ipv6h);
843 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
844 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
845 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
846 fl6.flowlabel |= ip6_flowlabel(ipv6h);
847 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
848 fl6.flowi6_mark = skb->mark;
849
850 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
851 if (err != 0) {
852 if (err == -EMSGSIZE)
853 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
854 return -1;
855 }
856
857 return 0;
858 }
859
860 /**
861 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
862 * @t: the outgoing tunnel device
863 * @hdr: IPv6 header from the incoming packet
864 *
865 * Description:
866 * Avoid trivial tunneling loop by checking that tunnel exit-point
867 * doesn't match source of incoming packet.
868 *
869 * Return:
870 * 1 if conflict,
871 * 0 else
872 **/
873
874 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
875 const struct ipv6hdr *hdr)
876 {
877 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
878 }
879
880 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
881 {
882 struct ip6_tnl *t = netdev_priv(dev);
883 int encap_limit = -1;
884 struct flowi6 fl6;
885 __u32 mtu;
886 int err;
887
888 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
889 encap_limit = t->parms.encap_limit;
890
891 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
892 fl6.flowi6_proto = skb->protocol;
893
894 err = ip6gre_xmit2(skb, dev, 0, &fl6, encap_limit, &mtu);
895
896 return err;
897 }
898
899 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
900 struct net_device *dev)
901 {
902 struct ip6_tnl *t = netdev_priv(dev);
903 struct net_device_stats *stats = &t->dev->stats;
904 int ret;
905
906 if (!ip6_tnl_xmit_ctl(t))
907 goto tx_err;
908
909 switch (skb->protocol) {
910 case htons(ETH_P_IP):
911 ret = ip6gre_xmit_ipv4(skb, dev);
912 break;
913 case htons(ETH_P_IPV6):
914 ret = ip6gre_xmit_ipv6(skb, dev);
915 break;
916 default:
917 ret = ip6gre_xmit_other(skb, dev);
918 break;
919 }
920
921 if (ret < 0)
922 goto tx_err;
923
924 return NETDEV_TX_OK;
925
926 tx_err:
927 stats->tx_errors++;
928 stats->tx_dropped++;
929 kfree_skb(skb);
930 return NETDEV_TX_OK;
931 }
932
933 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
934 {
935 struct net_device *dev = t->dev;
936 struct __ip6_tnl_parm *p = &t->parms;
937 struct flowi6 *fl6 = &t->fl.u.ip6;
938 int addend = sizeof(struct ipv6hdr) + 4;
939
940 if (dev->type != ARPHRD_ETHER) {
941 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
942 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
943 }
944
945 /* Set up flowi template */
946 fl6->saddr = p->laddr;
947 fl6->daddr = p->raddr;
948 fl6->flowi6_oif = p->link;
949 fl6->flowlabel = 0;
950
951 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
952 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
953 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
954 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
955
956 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
957 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
958
959 if (p->flags&IP6_TNL_F_CAP_XMIT &&
960 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
961 dev->flags |= IFF_POINTOPOINT;
962 else
963 dev->flags &= ~IFF_POINTOPOINT;
964
965 dev->iflink = p->link;
966
967 /* Precalculate GRE options length */
968 if (t->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) {
969 if (t->parms.o_flags&GRE_CSUM)
970 addend += 4;
971 if (t->parms.o_flags&GRE_KEY)
972 addend += 4;
973 if (t->parms.o_flags&GRE_SEQ)
974 addend += 4;
975 }
976 t->hlen = addend;
977
978 if (p->flags & IP6_TNL_F_CAP_XMIT) {
979 int strict = (ipv6_addr_type(&p->raddr) &
980 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
981
982 struct rt6_info *rt = rt6_lookup(dev_net(dev),
983 &p->raddr, &p->laddr,
984 p->link, strict);
985
986 if (rt == NULL)
987 return;
988
989 if (rt->dst.dev) {
990 dev->hard_header_len = rt->dst.dev->hard_header_len + addend;
991
992 if (set_mtu) {
993 dev->mtu = rt->dst.dev->mtu - addend;
994 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
995 dev->mtu -= 8;
996
997 if (dev->mtu < IPV6_MIN_MTU)
998 dev->mtu = IPV6_MIN_MTU;
999 }
1000 }
1001 ip6_rt_put(rt);
1002 }
1003 }
1004
1005 static int ip6gre_tnl_change(struct ip6_tnl *t,
1006 const struct __ip6_tnl_parm *p, int set_mtu)
1007 {
1008 t->parms.laddr = p->laddr;
1009 t->parms.raddr = p->raddr;
1010 t->parms.flags = p->flags;
1011 t->parms.hop_limit = p->hop_limit;
1012 t->parms.encap_limit = p->encap_limit;
1013 t->parms.flowinfo = p->flowinfo;
1014 t->parms.link = p->link;
1015 t->parms.proto = p->proto;
1016 t->parms.i_key = p->i_key;
1017 t->parms.o_key = p->o_key;
1018 t->parms.i_flags = p->i_flags;
1019 t->parms.o_flags = p->o_flags;
1020 ip6_tnl_dst_reset(t);
1021 ip6gre_tnl_link_config(t, set_mtu);
1022 return 0;
1023 }
1024
1025 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1026 const struct ip6_tnl_parm2 *u)
1027 {
1028 p->laddr = u->laddr;
1029 p->raddr = u->raddr;
1030 p->flags = u->flags;
1031 p->hop_limit = u->hop_limit;
1032 p->encap_limit = u->encap_limit;
1033 p->flowinfo = u->flowinfo;
1034 p->link = u->link;
1035 p->i_key = u->i_key;
1036 p->o_key = u->o_key;
1037 p->i_flags = u->i_flags;
1038 p->o_flags = u->o_flags;
1039 memcpy(p->name, u->name, sizeof(u->name));
1040 }
1041
1042 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1043 const struct __ip6_tnl_parm *p)
1044 {
1045 u->proto = IPPROTO_GRE;
1046 u->laddr = p->laddr;
1047 u->raddr = p->raddr;
1048 u->flags = p->flags;
1049 u->hop_limit = p->hop_limit;
1050 u->encap_limit = p->encap_limit;
1051 u->flowinfo = p->flowinfo;
1052 u->link = p->link;
1053 u->i_key = p->i_key;
1054 u->o_key = p->o_key;
1055 u->i_flags = p->i_flags;
1056 u->o_flags = p->o_flags;
1057 memcpy(u->name, p->name, sizeof(u->name));
1058 }
1059
1060 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1061 struct ifreq *ifr, int cmd)
1062 {
1063 int err = 0;
1064 struct ip6_tnl_parm2 p;
1065 struct __ip6_tnl_parm p1;
1066 struct ip6_tnl *t;
1067 struct net *net = dev_net(dev);
1068 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1069
1070 switch (cmd) {
1071 case SIOCGETTUNNEL:
1072 t = NULL;
1073 if (dev == ign->fb_tunnel_dev) {
1074 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1075 err = -EFAULT;
1076 break;
1077 }
1078 ip6gre_tnl_parm_from_user(&p1, &p);
1079 t = ip6gre_tunnel_locate(net, &p1, 0);
1080 }
1081 if (t == NULL)
1082 t = netdev_priv(dev);
1083 memset(&p, 0, sizeof(p));
1084 ip6gre_tnl_parm_to_user(&p, &t->parms);
1085 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1086 err = -EFAULT;
1087 break;
1088
1089 case SIOCADDTUNNEL:
1090 case SIOCCHGTUNNEL:
1091 err = -EPERM;
1092 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1093 goto done;
1094
1095 err = -EFAULT;
1096 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1097 goto done;
1098
1099 err = -EINVAL;
1100 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1101 goto done;
1102
1103 if (!(p.i_flags&GRE_KEY))
1104 p.i_key = 0;
1105 if (!(p.o_flags&GRE_KEY))
1106 p.o_key = 0;
1107
1108 ip6gre_tnl_parm_from_user(&p1, &p);
1109 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1110
1111 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1112 if (t != NULL) {
1113 if (t->dev != dev) {
1114 err = -EEXIST;
1115 break;
1116 }
1117 } else {
1118 t = netdev_priv(dev);
1119
1120 ip6gre_tunnel_unlink(ign, t);
1121 synchronize_net();
1122 ip6gre_tnl_change(t, &p1, 1);
1123 ip6gre_tunnel_link(ign, t);
1124 netdev_state_change(dev);
1125 }
1126 }
1127
1128 if (t) {
1129 err = 0;
1130
1131 memset(&p, 0, sizeof(p));
1132 ip6gre_tnl_parm_to_user(&p, &t->parms);
1133 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1134 err = -EFAULT;
1135 } else
1136 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1137 break;
1138
1139 case SIOCDELTUNNEL:
1140 err = -EPERM;
1141 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1142 goto done;
1143
1144 if (dev == ign->fb_tunnel_dev) {
1145 err = -EFAULT;
1146 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1147 goto done;
1148 err = -ENOENT;
1149 ip6gre_tnl_parm_from_user(&p1, &p);
1150 t = ip6gre_tunnel_locate(net, &p1, 0);
1151 if (t == NULL)
1152 goto done;
1153 err = -EPERM;
1154 if (t == netdev_priv(ign->fb_tunnel_dev))
1155 goto done;
1156 dev = t->dev;
1157 }
1158 unregister_netdevice(dev);
1159 err = 0;
1160 break;
1161
1162 default:
1163 err = -EINVAL;
1164 }
1165
1166 done:
1167 return err;
1168 }
1169
1170 static int ip6gre_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1171 {
1172 if (new_mtu < 68 ||
1173 new_mtu > 0xFFF8 - dev->hard_header_len)
1174 return -EINVAL;
1175 dev->mtu = new_mtu;
1176 return 0;
1177 }
1178
1179 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1180 unsigned short type,
1181 const void *daddr, const void *saddr, unsigned int len)
1182 {
1183 struct ip6_tnl *t = netdev_priv(dev);
1184 struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen);
1185 __be16 *p = (__be16 *)(ipv6h+1);
1186
1187 ip6_flow_hdr(ipv6h, 0, t->fl.u.ip6.flowlabel);
1188 ipv6h->hop_limit = t->parms.hop_limit;
1189 ipv6h->nexthdr = NEXTHDR_GRE;
1190 ipv6h->saddr = t->parms.laddr;
1191 ipv6h->daddr = t->parms.raddr;
1192
1193 p[0] = t->parms.o_flags;
1194 p[1] = htons(type);
1195
1196 /*
1197 * Set the source hardware address.
1198 */
1199
1200 if (saddr)
1201 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1202 if (daddr)
1203 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1204 if (!ipv6_addr_any(&ipv6h->daddr))
1205 return t->hlen;
1206
1207 return -t->hlen;
1208 }
1209
1210 static const struct header_ops ip6gre_header_ops = {
1211 .create = ip6gre_header,
1212 };
1213
1214 static const struct net_device_ops ip6gre_netdev_ops = {
1215 .ndo_init = ip6gre_tunnel_init,
1216 .ndo_uninit = ip6gre_tunnel_uninit,
1217 .ndo_start_xmit = ip6gre_tunnel_xmit,
1218 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1219 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1220 .ndo_get_stats64 = ip_tunnel_get_stats64,
1221 };
1222
1223 static void ip6gre_dev_free(struct net_device *dev)
1224 {
1225 free_percpu(dev->tstats);
1226 free_netdev(dev);
1227 }
1228
1229 static void ip6gre_tunnel_setup(struct net_device *dev)
1230 {
1231 struct ip6_tnl *t;
1232
1233 dev->netdev_ops = &ip6gre_netdev_ops;
1234 dev->destructor = ip6gre_dev_free;
1235
1236 dev->type = ARPHRD_IP6GRE;
1237 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr) + 4;
1238 dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr) - 4;
1239 t = netdev_priv(dev);
1240 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1241 dev->mtu -= 8;
1242 dev->flags |= IFF_NOARP;
1243 dev->iflink = 0;
1244 dev->addr_len = sizeof(struct in6_addr);
1245 dev->features |= NETIF_F_NETNS_LOCAL;
1246 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1247 }
1248
1249 static int ip6gre_tunnel_init(struct net_device *dev)
1250 {
1251 struct ip6_tnl *tunnel;
1252 int i;
1253
1254 tunnel = netdev_priv(dev);
1255
1256 tunnel->dev = dev;
1257 tunnel->net = dev_net(dev);
1258 strcpy(tunnel->parms.name, dev->name);
1259
1260 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1261 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1262
1263 if (ipv6_addr_any(&tunnel->parms.raddr))
1264 dev->header_ops = &ip6gre_header_ops;
1265
1266 dev->tstats = alloc_percpu(struct pcpu_sw_netstats);
1267 if (!dev->tstats)
1268 return -ENOMEM;
1269
1270 for_each_possible_cpu(i) {
1271 struct pcpu_sw_netstats *ip6gre_tunnel_stats;
1272 ip6gre_tunnel_stats = per_cpu_ptr(dev->tstats, i);
1273 u64_stats_init(&ip6gre_tunnel_stats->syncp);
1274 }
1275
1276
1277 return 0;
1278 }
1279
1280 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1281 {
1282 struct ip6_tnl *tunnel = netdev_priv(dev);
1283
1284 tunnel->dev = dev;
1285 tunnel->net = dev_net(dev);
1286 strcpy(tunnel->parms.name, dev->name);
1287
1288 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1289
1290 dev_hold(dev);
1291 }
1292
1293
1294 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1295 .handler = ip6gre_rcv,
1296 .err_handler = ip6gre_err,
1297 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1298 };
1299
1300 static void ip6gre_destroy_tunnels(struct ip6gre_net *ign,
1301 struct list_head *head)
1302 {
1303 int prio;
1304
1305 for (prio = 0; prio < 4; prio++) {
1306 int h;
1307 for (h = 0; h < HASH_SIZE; h++) {
1308 struct ip6_tnl *t;
1309
1310 t = rtnl_dereference(ign->tunnels[prio][h]);
1311
1312 while (t != NULL) {
1313 unregister_netdevice_queue(t->dev, head);
1314 t = rtnl_dereference(t->next);
1315 }
1316 }
1317 }
1318 }
1319
1320 static 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",
1326 ip6gre_tunnel_setup);
1327 if (!ign->fb_tunnel_dev) {
1328 err = -ENOMEM;
1329 goto err_alloc_dev;
1330 }
1331 dev_net_set(ign->fb_tunnel_dev, net);
1332
1333 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1334 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1335
1336 err = register_netdev(ign->fb_tunnel_dev);
1337 if (err)
1338 goto err_reg_dev;
1339
1340 rcu_assign_pointer(ign->tunnels_wc[0],
1341 netdev_priv(ign->fb_tunnel_dev));
1342 return 0;
1343
1344 err_reg_dev:
1345 ip6gre_dev_free(ign->fb_tunnel_dev);
1346 err_alloc_dev:
1347 return err;
1348 }
1349
1350 static void __net_exit ip6gre_exit_net(struct net *net)
1351 {
1352 struct ip6gre_net *ign;
1353 LIST_HEAD(list);
1354
1355 ign = net_generic(net, ip6gre_net_id);
1356 rtnl_lock();
1357 ip6gre_destroy_tunnels(ign, &list);
1358 unregister_netdevice_many(&list);
1359 rtnl_unlock();
1360 }
1361
1362 static struct pernet_operations ip6gre_net_ops = {
1363 .init = ip6gre_init_net,
1364 .exit = ip6gre_exit_net,
1365 .id = &ip6gre_net_id,
1366 .size = sizeof(struct ip6gre_net),
1367 };
1368
1369 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
1370 {
1371 __be16 flags;
1372
1373 if (!data)
1374 return 0;
1375
1376 flags = 0;
1377 if (data[IFLA_GRE_IFLAGS])
1378 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1379 if (data[IFLA_GRE_OFLAGS])
1380 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1381 if (flags & (GRE_VERSION|GRE_ROUTING))
1382 return -EINVAL;
1383
1384 return 0;
1385 }
1386
1387 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
1388 {
1389 struct in6_addr daddr;
1390
1391 if (tb[IFLA_ADDRESS]) {
1392 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1393 return -EINVAL;
1394 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1395 return -EADDRNOTAVAIL;
1396 }
1397
1398 if (!data)
1399 goto out;
1400
1401 if (data[IFLA_GRE_REMOTE]) {
1402 nla_memcpy(&daddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1403 if (ipv6_addr_any(&daddr))
1404 return -EINVAL;
1405 }
1406
1407 out:
1408 return ip6gre_tunnel_validate(tb, data);
1409 }
1410
1411
1412 static void ip6gre_netlink_parms(struct nlattr *data[],
1413 struct __ip6_tnl_parm *parms)
1414 {
1415 memset(parms, 0, sizeof(*parms));
1416
1417 if (!data)
1418 return;
1419
1420 if (data[IFLA_GRE_LINK])
1421 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1422
1423 if (data[IFLA_GRE_IFLAGS])
1424 parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]);
1425
1426 if (data[IFLA_GRE_OFLAGS])
1427 parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]);
1428
1429 if (data[IFLA_GRE_IKEY])
1430 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1431
1432 if (data[IFLA_GRE_OKEY])
1433 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1434
1435 if (data[IFLA_GRE_LOCAL])
1436 nla_memcpy(&parms->laddr, data[IFLA_GRE_LOCAL], sizeof(struct in6_addr));
1437
1438 if (data[IFLA_GRE_REMOTE])
1439 nla_memcpy(&parms->raddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1440
1441 if (data[IFLA_GRE_TTL])
1442 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1443
1444 if (data[IFLA_GRE_ENCAP_LIMIT])
1445 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1446
1447 if (data[IFLA_GRE_FLOWINFO])
1448 parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]);
1449
1450 if (data[IFLA_GRE_FLAGS])
1451 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1452 }
1453
1454 static int ip6gre_tap_init(struct net_device *dev)
1455 {
1456 struct ip6_tnl *tunnel;
1457
1458 tunnel = netdev_priv(dev);
1459
1460 tunnel->dev = dev;
1461 tunnel->net = dev_net(dev);
1462 strcpy(tunnel->parms.name, dev->name);
1463
1464 ip6gre_tnl_link_config(tunnel, 1);
1465
1466 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1467 if (!dev->tstats)
1468 return -ENOMEM;
1469
1470 return 0;
1471 }
1472
1473 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1474 .ndo_init = ip6gre_tap_init,
1475 .ndo_uninit = ip6gre_tunnel_uninit,
1476 .ndo_start_xmit = ip6gre_tunnel_xmit,
1477 .ndo_set_mac_address = eth_mac_addr,
1478 .ndo_validate_addr = eth_validate_addr,
1479 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1480 .ndo_get_stats64 = ip_tunnel_get_stats64,
1481 };
1482
1483 static void ip6gre_tap_setup(struct net_device *dev)
1484 {
1485
1486 ether_setup(dev);
1487
1488 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1489 dev->destructor = ip6gre_dev_free;
1490
1491 dev->iflink = 0;
1492 dev->features |= NETIF_F_NETNS_LOCAL;
1493 }
1494
1495 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1496 struct nlattr *tb[], struct nlattr *data[])
1497 {
1498 struct ip6_tnl *nt;
1499 struct net *net = dev_net(dev);
1500 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1501 int err;
1502
1503 nt = netdev_priv(dev);
1504 ip6gre_netlink_parms(data, &nt->parms);
1505
1506 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1507 return -EEXIST;
1508
1509 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1510 eth_hw_addr_random(dev);
1511
1512 nt->dev = dev;
1513 nt->net = dev_net(dev);
1514 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1515
1516 /* Can use a lockless transmit, unless we generate output sequences */
1517 if (!(nt->parms.o_flags & GRE_SEQ))
1518 dev->features |= NETIF_F_LLTX;
1519
1520 err = register_netdevice(dev);
1521 if (err)
1522 goto out;
1523
1524 dev_hold(dev);
1525 ip6gre_tunnel_link(ign, nt);
1526
1527 out:
1528 return err;
1529 }
1530
1531 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1532 struct nlattr *data[])
1533 {
1534 struct ip6_tnl *t, *nt;
1535 struct net *net = dev_net(dev);
1536 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1537 struct __ip6_tnl_parm p;
1538
1539 if (dev == ign->fb_tunnel_dev)
1540 return -EINVAL;
1541
1542 nt = netdev_priv(dev);
1543 ip6gre_netlink_parms(data, &p);
1544
1545 t = ip6gre_tunnel_locate(net, &p, 0);
1546
1547 if (t) {
1548 if (t->dev != dev)
1549 return -EEXIST;
1550 } else {
1551 t = nt;
1552
1553 ip6gre_tunnel_unlink(ign, t);
1554 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1555 ip6gre_tunnel_link(ign, t);
1556 netdev_state_change(dev);
1557 }
1558
1559 return 0;
1560 }
1561
1562 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
1563 {
1564 struct net *net = dev_net(dev);
1565 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1566
1567 if (dev != ign->fb_tunnel_dev)
1568 unregister_netdevice_queue(dev, head);
1569 }
1570
1571 static size_t ip6gre_get_size(const struct net_device *dev)
1572 {
1573 return
1574 /* IFLA_GRE_LINK */
1575 nla_total_size(4) +
1576 /* IFLA_GRE_IFLAGS */
1577 nla_total_size(2) +
1578 /* IFLA_GRE_OFLAGS */
1579 nla_total_size(2) +
1580 /* IFLA_GRE_IKEY */
1581 nla_total_size(4) +
1582 /* IFLA_GRE_OKEY */
1583 nla_total_size(4) +
1584 /* IFLA_GRE_LOCAL */
1585 nla_total_size(sizeof(struct in6_addr)) +
1586 /* IFLA_GRE_REMOTE */
1587 nla_total_size(sizeof(struct in6_addr)) +
1588 /* IFLA_GRE_TTL */
1589 nla_total_size(1) +
1590 /* IFLA_GRE_TOS */
1591 nla_total_size(1) +
1592 /* IFLA_GRE_ENCAP_LIMIT */
1593 nla_total_size(1) +
1594 /* IFLA_GRE_FLOWINFO */
1595 nla_total_size(4) +
1596 /* IFLA_GRE_FLAGS */
1597 nla_total_size(4) +
1598 0;
1599 }
1600
1601 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1602 {
1603 struct ip6_tnl *t = netdev_priv(dev);
1604 struct __ip6_tnl_parm *p = &t->parms;
1605
1606 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1607 nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) ||
1608 nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) ||
1609 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1610 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
1611 nla_put(skb, IFLA_GRE_LOCAL, sizeof(struct in6_addr), &p->laddr) ||
1612 nla_put(skb, IFLA_GRE_REMOTE, sizeof(struct in6_addr), &p->raddr) ||
1613 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1614 /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/
1615 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1616 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1617 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags))
1618 goto nla_put_failure;
1619 return 0;
1620
1621 nla_put_failure:
1622 return -EMSGSIZE;
1623 }
1624
1625 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1626 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1627 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1628 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1629 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1630 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1631 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1632 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1633 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1634 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1635 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1636 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1637 };
1638
1639 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1640 .kind = "ip6gre",
1641 .maxtype = IFLA_GRE_MAX,
1642 .policy = ip6gre_policy,
1643 .priv_size = sizeof(struct ip6_tnl),
1644 .setup = ip6gre_tunnel_setup,
1645 .validate = ip6gre_tunnel_validate,
1646 .newlink = ip6gre_newlink,
1647 .changelink = ip6gre_changelink,
1648 .dellink = ip6gre_dellink,
1649 .get_size = ip6gre_get_size,
1650 .fill_info = ip6gre_fill_info,
1651 };
1652
1653 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1654 .kind = "ip6gretap",
1655 .maxtype = IFLA_GRE_MAX,
1656 .policy = ip6gre_policy,
1657 .priv_size = sizeof(struct ip6_tnl),
1658 .setup = ip6gre_tap_setup,
1659 .validate = ip6gre_tap_validate,
1660 .newlink = ip6gre_newlink,
1661 .changelink = ip6gre_changelink,
1662 .get_size = ip6gre_get_size,
1663 .fill_info = ip6gre_fill_info,
1664 };
1665
1666 /*
1667 * And now the modules code and kernel interface.
1668 */
1669
1670 static int __init ip6gre_init(void)
1671 {
1672 int err;
1673
1674 pr_info("GRE over IPv6 tunneling driver\n");
1675
1676 err = register_pernet_device(&ip6gre_net_ops);
1677 if (err < 0)
1678 return err;
1679
1680 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1681 if (err < 0) {
1682 pr_info("%s: can't add protocol\n", __func__);
1683 goto add_proto_failed;
1684 }
1685
1686 err = rtnl_link_register(&ip6gre_link_ops);
1687 if (err < 0)
1688 goto rtnl_link_failed;
1689
1690 err = rtnl_link_register(&ip6gre_tap_ops);
1691 if (err < 0)
1692 goto tap_ops_failed;
1693
1694 out:
1695 return err;
1696
1697 tap_ops_failed:
1698 rtnl_link_unregister(&ip6gre_link_ops);
1699 rtnl_link_failed:
1700 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1701 add_proto_failed:
1702 unregister_pernet_device(&ip6gre_net_ops);
1703 goto out;
1704 }
1705
1706 static void __exit ip6gre_fini(void)
1707 {
1708 rtnl_link_unregister(&ip6gre_tap_ops);
1709 rtnl_link_unregister(&ip6gre_link_ops);
1710 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1711 unregister_pernet_device(&ip6gre_net_ops);
1712 }
1713
1714 module_init(ip6gre_init);
1715 module_exit(ip6gre_fini);
1716 MODULE_LICENSE("GPL");
1717 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1718 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1719 MODULE_ALIAS_RTNL_LINK("ip6gre");
1720 MODULE_ALIAS_NETDEV("ip6gre0");
Linux kernel - Deliverables
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