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ip6gre: add x-netns support
[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 != NULL)
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 t;
319
320 if (parms->name[0])
321 strlcpy(name, parms->name, IFNAMSIZ);
322 else
323 strcpy(name, "ip6gre%d");
324
325 dev = alloc_netdev(sizeof(*t), name, ip6gre_tunnel_setup);
326 if (!dev)
327 return NULL;
328
329 dev_net_set(dev, net);
330
331 nt = netdev_priv(dev);
332 nt->parms = *parms;
333 dev->rtnl_link_ops = &ip6gre_link_ops;
334
335 nt->dev = dev;
336 nt->net = dev_net(dev);
337 ip6gre_tnl_link_config(nt, 1);
338
339 if (register_netdevice(dev) < 0)
340 goto failed_free;
341
342 /* Can use a lockless transmit, unless we generate output sequences */
343 if (!(nt->parms.o_flags & GRE_SEQ))
344 dev->features |= NETIF_F_LLTX;
345
346 dev_hold(dev);
347 ip6gre_tunnel_link(ign, nt);
348 return nt;
349
350 failed_free:
351 free_netdev(dev);
352 return NULL;
353 }
354
355 static void ip6gre_tunnel_uninit(struct net_device *dev)
356 {
357 struct ip6_tnl *t = netdev_priv(dev);
358 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
359
360 ip6gre_tunnel_unlink(ign, t);
361 dev_put(dev);
362 }
363
364
365 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
366 u8 type, u8 code, int offset, __be32 info)
367 {
368 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
369 __be16 *p = (__be16 *)(skb->data + offset);
370 int grehlen = offset + 4;
371 struct ip6_tnl *t;
372 __be16 flags;
373
374 flags = p[0];
375 if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) {
376 if (flags&(GRE_VERSION|GRE_ROUTING))
377 return;
378 if (flags&GRE_KEY) {
379 grehlen += 4;
380 if (flags&GRE_CSUM)
381 grehlen += 4;
382 }
383 }
384
385 /* If only 8 bytes returned, keyed message will be dropped here */
386 if (!pskb_may_pull(skb, grehlen))
387 return;
388 ipv6h = (const struct ipv6hdr *)skb->data;
389 p = (__be16 *)(skb->data + offset);
390
391 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
392 flags & GRE_KEY ?
393 *(((__be32 *)p) + (grehlen / 4) - 1) : 0,
394 p[1]);
395 if (t == NULL)
396 return;
397
398 switch (type) {
399 __u32 teli;
400 struct ipv6_tlv_tnl_enc_lim *tel;
401 __u32 mtu;
402 case ICMPV6_DEST_UNREACH:
403 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
404 t->parms.name);
405 break;
406 case ICMPV6_TIME_EXCEED:
407 if (code == ICMPV6_EXC_HOPLIMIT) {
408 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
409 t->parms.name);
410 }
411 break;
412 case ICMPV6_PARAMPROB:
413 teli = 0;
414 if (code == ICMPV6_HDR_FIELD)
415 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
416
417 if (teli && teli == info - 2) {
418 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
419 if (tel->encap_limit == 0) {
420 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
421 t->parms.name);
422 }
423 } else {
424 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
425 t->parms.name);
426 }
427 break;
428 case ICMPV6_PKT_TOOBIG:
429 mtu = info - offset;
430 if (mtu < IPV6_MIN_MTU)
431 mtu = IPV6_MIN_MTU;
432 t->dev->mtu = mtu;
433 break;
434 }
435
436 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
437 t->err_count++;
438 else
439 t->err_count = 1;
440 t->err_time = jiffies;
441 }
442
443 static int ip6gre_rcv(struct sk_buff *skb)
444 {
445 const struct ipv6hdr *ipv6h;
446 u8 *h;
447 __be16 flags;
448 __sum16 csum = 0;
449 __be32 key = 0;
450 u32 seqno = 0;
451 struct ip6_tnl *tunnel;
452 int offset = 4;
453 __be16 gre_proto;
454 int err;
455
456 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
457 goto drop;
458
459 ipv6h = ipv6_hdr(skb);
460 h = skb->data;
461 flags = *(__be16 *)h;
462
463 if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) {
464 /* - Version must be 0.
465 - We do not support routing headers.
466 */
467 if (flags&(GRE_VERSION|GRE_ROUTING))
468 goto drop;
469
470 if (flags&GRE_CSUM) {
471 switch (skb->ip_summed) {
472 case CHECKSUM_COMPLETE:
473 csum = csum_fold(skb->csum);
474 if (!csum)
475 break;
476 /* fall through */
477 case CHECKSUM_NONE:
478 skb->csum = 0;
479 csum = __skb_checksum_complete(skb);
480 skb->ip_summed = CHECKSUM_COMPLETE;
481 }
482 offset += 4;
483 }
484 if (flags&GRE_KEY) {
485 key = *(__be32 *)(h + offset);
486 offset += 4;
487 }
488 if (flags&GRE_SEQ) {
489 seqno = ntohl(*(__be32 *)(h + offset));
490 offset += 4;
491 }
492 }
493
494 gre_proto = *(__be16 *)(h + 2);
495
496 tunnel = ip6gre_tunnel_lookup(skb->dev,
497 &ipv6h->saddr, &ipv6h->daddr, key,
498 gre_proto);
499 if (tunnel) {
500 struct pcpu_sw_netstats *tstats;
501
502 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
503 goto drop;
504
505 if (!ip6_tnl_rcv_ctl(tunnel, &ipv6h->daddr, &ipv6h->saddr)) {
506 tunnel->dev->stats.rx_dropped++;
507 goto drop;
508 }
509
510 skb->protocol = gre_proto;
511 /* WCCP version 1 and 2 protocol decoding.
512 * - Change protocol to IP
513 * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
514 */
515 if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) {
516 skb->protocol = htons(ETH_P_IP);
517 if ((*(h + offset) & 0xF0) != 0x40)
518 offset += 4;
519 }
520
521 skb->mac_header = skb->network_header;
522 __pskb_pull(skb, offset);
523 skb_postpull_rcsum(skb, skb_transport_header(skb), offset);
524
525 if (((flags&GRE_CSUM) && csum) ||
526 (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) {
527 tunnel->dev->stats.rx_crc_errors++;
528 tunnel->dev->stats.rx_errors++;
529 goto drop;
530 }
531 if (tunnel->parms.i_flags&GRE_SEQ) {
532 if (!(flags&GRE_SEQ) ||
533 (tunnel->i_seqno &&
534 (s32)(seqno - tunnel->i_seqno) < 0)) {
535 tunnel->dev->stats.rx_fifo_errors++;
536 tunnel->dev->stats.rx_errors++;
537 goto drop;
538 }
539 tunnel->i_seqno = seqno + 1;
540 }
541
542 /* Warning: All skb pointers will be invalidated! */
543 if (tunnel->dev->type == ARPHRD_ETHER) {
544 if (!pskb_may_pull(skb, ETH_HLEN)) {
545 tunnel->dev->stats.rx_length_errors++;
546 tunnel->dev->stats.rx_errors++;
547 goto drop;
548 }
549
550 ipv6h = ipv6_hdr(skb);
551 skb->protocol = eth_type_trans(skb, tunnel->dev);
552 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
553 }
554
555 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
556
557 skb_reset_network_header(skb);
558
559 err = IP6_ECN_decapsulate(ipv6h, skb);
560 if (unlikely(err)) {
561 if (log_ecn_error)
562 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
563 &ipv6h->saddr,
564 ipv6_get_dsfield(ipv6h));
565 if (err > 1) {
566 ++tunnel->dev->stats.rx_frame_errors;
567 ++tunnel->dev->stats.rx_errors;
568 goto drop;
569 }
570 }
571
572 tstats = this_cpu_ptr(tunnel->dev->tstats);
573 u64_stats_update_begin(&tstats->syncp);
574 tstats->rx_packets++;
575 tstats->rx_bytes += skb->len;
576 u64_stats_update_end(&tstats->syncp);
577
578 netif_rx(skb);
579
580 return 0;
581 }
582 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
583
584 drop:
585 kfree_skb(skb);
586 return 0;
587 }
588
589 struct ipv6_tel_txoption {
590 struct ipv6_txoptions ops;
591 __u8 dst_opt[8];
592 };
593
594 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
595 {
596 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
597
598 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
599 opt->dst_opt[3] = 1;
600 opt->dst_opt[4] = encap_limit;
601 opt->dst_opt[5] = IPV6_TLV_PADN;
602 opt->dst_opt[6] = 1;
603
604 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
605 opt->ops.opt_nflen = 8;
606 }
607
608 static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
609 struct net_device *dev,
610 __u8 dsfield,
611 struct flowi6 *fl6,
612 int encap_limit,
613 __u32 *pmtu)
614 {
615 struct ip6_tnl *tunnel = netdev_priv(dev);
616 struct net *net = tunnel->net;
617 struct net_device *tdev; /* Device to other host */
618 struct ipv6hdr *ipv6h; /* Our new IP header */
619 unsigned int max_headroom = 0; /* The extra header space needed */
620 int gre_hlen;
621 struct ipv6_tel_txoption opt;
622 int mtu;
623 struct dst_entry *dst = NULL, *ndst = NULL;
624 struct net_device_stats *stats = &tunnel->dev->stats;
625 int err = -1;
626 u8 proto;
627 struct sk_buff *new_skb;
628
629 if (dev->type == ARPHRD_ETHER)
630 IPCB(skb)->flags = 0;
631
632 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) {
633 gre_hlen = 0;
634 ipv6h = (struct ipv6hdr *)skb->data;
635 fl6->daddr = ipv6h->daddr;
636 } else {
637 gre_hlen = tunnel->hlen;
638 fl6->daddr = tunnel->parms.raddr;
639 }
640
641 if (!fl6->flowi6_mark)
642 dst = ip6_tnl_dst_check(tunnel);
643
644 if (!dst) {
645 ndst = ip6_route_output(net, NULL, fl6);
646
647 if (ndst->error)
648 goto tx_err_link_failure;
649 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
650 if (IS_ERR(ndst)) {
651 err = PTR_ERR(ndst);
652 ndst = NULL;
653 goto tx_err_link_failure;
654 }
655 dst = ndst;
656 }
657
658 tdev = dst->dev;
659
660 if (tdev == dev) {
661 stats->collisions++;
662 net_warn_ratelimited("%s: Local routing loop detected!\n",
663 tunnel->parms.name);
664 goto tx_err_dst_release;
665 }
666
667 mtu = dst_mtu(dst) - sizeof(*ipv6h);
668 if (encap_limit >= 0) {
669 max_headroom += 8;
670 mtu -= 8;
671 }
672 if (mtu < IPV6_MIN_MTU)
673 mtu = IPV6_MIN_MTU;
674 if (skb_dst(skb))
675 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
676 if (skb->len > mtu) {
677 *pmtu = mtu;
678 err = -EMSGSIZE;
679 goto tx_err_dst_release;
680 }
681
682 if (tunnel->err_count > 0) {
683 if (time_before(jiffies,
684 tunnel->err_time + IP6TUNNEL_ERR_TIMEO)) {
685 tunnel->err_count--;
686
687 dst_link_failure(skb);
688 } else
689 tunnel->err_count = 0;
690 }
691
692 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
693
694 max_headroom += LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len;
695
696 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
697 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
698 new_skb = skb_realloc_headroom(skb, max_headroom);
699 if (max_headroom > dev->needed_headroom)
700 dev->needed_headroom = max_headroom;
701 if (!new_skb)
702 goto tx_err_dst_release;
703
704 if (skb->sk)
705 skb_set_owner_w(new_skb, skb->sk);
706 consume_skb(skb);
707 skb = new_skb;
708 }
709
710 if (fl6->flowi6_mark) {
711 skb_dst_set(skb, dst);
712 ndst = NULL;
713 } else {
714 skb_dst_set_noref(skb, dst);
715 }
716
717 proto = NEXTHDR_GRE;
718 if (encap_limit >= 0) {
719 init_tel_txopt(&opt, encap_limit);
720 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
721 }
722
723 if (likely(!skb->encapsulation)) {
724 skb_reset_inner_headers(skb);
725 skb->encapsulation = 1;
726 }
727
728 skb_push(skb, gre_hlen);
729 skb_reset_network_header(skb);
730 skb_set_transport_header(skb, sizeof(*ipv6h));
731
732 /*
733 * Push down and install the IP header.
734 */
735 ipv6h = ipv6_hdr(skb);
736 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), fl6->flowlabel);
737 ipv6h->hop_limit = tunnel->parms.hop_limit;
738 ipv6h->nexthdr = proto;
739 ipv6h->saddr = fl6->saddr;
740 ipv6h->daddr = fl6->daddr;
741
742 ((__be16 *)(ipv6h + 1))[0] = tunnel->parms.o_flags;
743 ((__be16 *)(ipv6h + 1))[1] = (dev->type == ARPHRD_ETHER) ?
744 htons(ETH_P_TEB) : skb->protocol;
745
746 if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) {
747 __be32 *ptr = (__be32 *)(((u8 *)ipv6h) + tunnel->hlen - 4);
748
749 if (tunnel->parms.o_flags&GRE_SEQ) {
750 ++tunnel->o_seqno;
751 *ptr = htonl(tunnel->o_seqno);
752 ptr--;
753 }
754 if (tunnel->parms.o_flags&GRE_KEY) {
755 *ptr = tunnel->parms.o_key;
756 ptr--;
757 }
758 if (tunnel->parms.o_flags&GRE_CSUM) {
759 *ptr = 0;
760 *(__sum16 *)ptr = ip_compute_csum((void *)(ipv6h+1),
761 skb->len - sizeof(struct ipv6hdr));
762 }
763 }
764
765 ip6tunnel_xmit(skb, dev);
766 if (ndst)
767 ip6_tnl_dst_store(tunnel, ndst);
768 return 0;
769 tx_err_link_failure:
770 stats->tx_carrier_errors++;
771 dst_link_failure(skb);
772 tx_err_dst_release:
773 dst_release(ndst);
774 return err;
775 }
776
777 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
778 {
779 struct ip6_tnl *t = netdev_priv(dev);
780 const struct iphdr *iph = ip_hdr(skb);
781 int encap_limit = -1;
782 struct flowi6 fl6;
783 __u8 dsfield;
784 __u32 mtu;
785 int err;
786
787 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
788 encap_limit = t->parms.encap_limit;
789
790 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
791 fl6.flowi6_proto = IPPROTO_IPIP;
792
793 dsfield = ipv4_get_dsfield(iph);
794
795 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
796 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
797 & IPV6_TCLASS_MASK;
798 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
799 fl6.flowi6_mark = skb->mark;
800
801 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
802 if (err != 0) {
803 /* XXX: send ICMP error even if DF is not set. */
804 if (err == -EMSGSIZE)
805 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
806 htonl(mtu));
807 return -1;
808 }
809
810 return 0;
811 }
812
813 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
814 {
815 struct ip6_tnl *t = netdev_priv(dev);
816 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
817 int encap_limit = -1;
818 __u16 offset;
819 struct flowi6 fl6;
820 __u8 dsfield;
821 __u32 mtu;
822 int err;
823
824 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
825 return -1;
826
827 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
828 if (offset > 0) {
829 struct ipv6_tlv_tnl_enc_lim *tel;
830 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
831 if (tel->encap_limit == 0) {
832 icmpv6_send(skb, ICMPV6_PARAMPROB,
833 ICMPV6_HDR_FIELD, offset + 2);
834 return -1;
835 }
836 encap_limit = tel->encap_limit - 1;
837 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
838 encap_limit = t->parms.encap_limit;
839
840 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
841 fl6.flowi6_proto = IPPROTO_IPV6;
842
843 dsfield = ipv6_get_dsfield(ipv6h);
844 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
845 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
846 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
847 fl6.flowlabel |= ip6_flowlabel(ipv6h);
848 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
849 fl6.flowi6_mark = skb->mark;
850
851 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
852 if (err != 0) {
853 if (err == -EMSGSIZE)
854 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
855 return -1;
856 }
857
858 return 0;
859 }
860
861 /**
862 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
863 * @t: the outgoing tunnel device
864 * @hdr: IPv6 header from the incoming packet
865 *
866 * Description:
867 * Avoid trivial tunneling loop by checking that tunnel exit-point
868 * doesn't match source of incoming packet.
869 *
870 * Return:
871 * 1 if conflict,
872 * 0 else
873 **/
874
875 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
876 const struct ipv6hdr *hdr)
877 {
878 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
879 }
880
881 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
882 {
883 struct ip6_tnl *t = netdev_priv(dev);
884 int encap_limit = -1;
885 struct flowi6 fl6;
886 __u32 mtu;
887 int err;
888
889 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
890 encap_limit = t->parms.encap_limit;
891
892 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
893 fl6.flowi6_proto = skb->protocol;
894
895 err = ip6gre_xmit2(skb, dev, 0, &fl6, encap_limit, &mtu);
896
897 return err;
898 }
899
900 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
901 struct net_device *dev)
902 {
903 struct ip6_tnl *t = netdev_priv(dev);
904 struct net_device_stats *stats = &t->dev->stats;
905 int ret;
906
907 if (!ip6_tnl_xmit_ctl(t))
908 goto tx_err;
909
910 switch (skb->protocol) {
911 case htons(ETH_P_IP):
912 ret = ip6gre_xmit_ipv4(skb, dev);
913 break;
914 case htons(ETH_P_IPV6):
915 ret = ip6gre_xmit_ipv6(skb, dev);
916 break;
917 default:
918 ret = ip6gre_xmit_other(skb, dev);
919 break;
920 }
921
922 if (ret < 0)
923 goto tx_err;
924
925 return NETDEV_TX_OK;
926
927 tx_err:
928 stats->tx_errors++;
929 stats->tx_dropped++;
930 kfree_skb(skb);
931 return NETDEV_TX_OK;
932 }
933
934 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
935 {
936 struct net_device *dev = t->dev;
937 struct __ip6_tnl_parm *p = &t->parms;
938 struct flowi6 *fl6 = &t->fl.u.ip6;
939 int addend = sizeof(struct ipv6hdr) + 4;
940
941 if (dev->type != ARPHRD_ETHER) {
942 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
943 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
944 }
945
946 /* Set up flowi template */
947 fl6->saddr = p->laddr;
948 fl6->daddr = p->raddr;
949 fl6->flowi6_oif = p->link;
950 fl6->flowlabel = 0;
951
952 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
953 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
954 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
955 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
956
957 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
958 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
959
960 if (p->flags&IP6_TNL_F_CAP_XMIT &&
961 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
962 dev->flags |= IFF_POINTOPOINT;
963 else
964 dev->flags &= ~IFF_POINTOPOINT;
965
966 dev->iflink = p->link;
967
968 /* Precalculate GRE options length */
969 if (t->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) {
970 if (t->parms.o_flags&GRE_CSUM)
971 addend += 4;
972 if (t->parms.o_flags&GRE_KEY)
973 addend += 4;
974 if (t->parms.o_flags&GRE_SEQ)
975 addend += 4;
976 }
977 t->hlen = addend;
978
979 if (p->flags & IP6_TNL_F_CAP_XMIT) {
980 int strict = (ipv6_addr_type(&p->raddr) &
981 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
982
983 struct rt6_info *rt = rt6_lookup(t->net,
984 &p->raddr, &p->laddr,
985 p->link, strict);
986
987 if (rt == NULL)
988 return;
989
990 if (rt->dst.dev) {
991 dev->hard_header_len = rt->dst.dev->hard_header_len + addend;
992
993 if (set_mtu) {
994 dev->mtu = rt->dst.dev->mtu - addend;
995 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
996 dev->mtu -= 8;
997
998 if (dev->mtu < IPV6_MIN_MTU)
999 dev->mtu = IPV6_MIN_MTU;
1000 }
1001 }
1002 ip6_rt_put(rt);
1003 }
1004 }
1005
1006 static int ip6gre_tnl_change(struct ip6_tnl *t,
1007 const struct __ip6_tnl_parm *p, int set_mtu)
1008 {
1009 t->parms.laddr = p->laddr;
1010 t->parms.raddr = p->raddr;
1011 t->parms.flags = p->flags;
1012 t->parms.hop_limit = p->hop_limit;
1013 t->parms.encap_limit = p->encap_limit;
1014 t->parms.flowinfo = p->flowinfo;
1015 t->parms.link = p->link;
1016 t->parms.proto = p->proto;
1017 t->parms.i_key = p->i_key;
1018 t->parms.o_key = p->o_key;
1019 t->parms.i_flags = p->i_flags;
1020 t->parms.o_flags = p->o_flags;
1021 ip6_tnl_dst_reset(t);
1022 ip6gre_tnl_link_config(t, set_mtu);
1023 return 0;
1024 }
1025
1026 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1027 const struct ip6_tnl_parm2 *u)
1028 {
1029 p->laddr = u->laddr;
1030 p->raddr = u->raddr;
1031 p->flags = u->flags;
1032 p->hop_limit = u->hop_limit;
1033 p->encap_limit = u->encap_limit;
1034 p->flowinfo = u->flowinfo;
1035 p->link = u->link;
1036 p->i_key = u->i_key;
1037 p->o_key = u->o_key;
1038 p->i_flags = u->i_flags;
1039 p->o_flags = u->o_flags;
1040 memcpy(p->name, u->name, sizeof(u->name));
1041 }
1042
1043 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1044 const struct __ip6_tnl_parm *p)
1045 {
1046 u->proto = IPPROTO_GRE;
1047 u->laddr = p->laddr;
1048 u->raddr = p->raddr;
1049 u->flags = p->flags;
1050 u->hop_limit = p->hop_limit;
1051 u->encap_limit = p->encap_limit;
1052 u->flowinfo = p->flowinfo;
1053 u->link = p->link;
1054 u->i_key = p->i_key;
1055 u->o_key = p->o_key;
1056 u->i_flags = p->i_flags;
1057 u->o_flags = p->o_flags;
1058 memcpy(u->name, p->name, sizeof(u->name));
1059 }
1060
1061 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1062 struct ifreq *ifr, int cmd)
1063 {
1064 int err = 0;
1065 struct ip6_tnl_parm2 p;
1066 struct __ip6_tnl_parm p1;
1067 struct ip6_tnl *t = netdev_priv(dev);
1068 struct net *net = t->net;
1069 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1070
1071 switch (cmd) {
1072 case SIOCGETTUNNEL:
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 if (t == NULL)
1081 t = netdev_priv(dev);
1082 }
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->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1246 }
1247
1248 static int ip6gre_tunnel_init(struct net_device *dev)
1249 {
1250 struct ip6_tnl *tunnel;
1251 int i;
1252
1253 tunnel = netdev_priv(dev);
1254
1255 tunnel->dev = dev;
1256 tunnel->net = dev_net(dev);
1257 strcpy(tunnel->parms.name, dev->name);
1258
1259 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1260 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1261
1262 if (ipv6_addr_any(&tunnel->parms.raddr))
1263 dev->header_ops = &ip6gre_header_ops;
1264
1265 dev->tstats = alloc_percpu(struct pcpu_sw_netstats);
1266 if (!dev->tstats)
1267 return -ENOMEM;
1268
1269 for_each_possible_cpu(i) {
1270 struct pcpu_sw_netstats *ip6gre_tunnel_stats;
1271 ip6gre_tunnel_stats = per_cpu_ptr(dev->tstats, i);
1272 u64_stats_init(&ip6gre_tunnel_stats->syncp);
1273 }
1274
1275
1276 return 0;
1277 }
1278
1279 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1280 {
1281 struct ip6_tnl *tunnel = netdev_priv(dev);
1282
1283 tunnel->dev = dev;
1284 tunnel->net = dev_net(dev);
1285 strcpy(tunnel->parms.name, dev->name);
1286
1287 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1288
1289 dev_hold(dev);
1290 }
1291
1292
1293 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1294 .handler = ip6gre_rcv,
1295 .err_handler = ip6gre_err,
1296 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1297 };
1298
1299 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1300 {
1301 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1302 struct net_device *dev, *aux;
1303 int prio;
1304
1305 for_each_netdev_safe(net, dev, aux)
1306 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1307 dev->rtnl_link_ops == &ip6gre_tap_ops)
1308 unregister_netdevice_queue(dev, head);
1309
1310 for (prio = 0; prio < 4; prio++) {
1311 int h;
1312 for (h = 0; h < HASH_SIZE; h++) {
1313 struct ip6_tnl *t;
1314
1315 t = rtnl_dereference(ign->tunnels[prio][h]);
1316
1317 while (t != NULL) {
1318 /* If dev is in the same netns, it has already
1319 * been added to the list by the previous loop.
1320 */
1321 if (!net_eq(dev_net(t->dev), net))
1322 unregister_netdevice_queue(t->dev,
1323 head);
1324 t = rtnl_dereference(t->next);
1325 }
1326 }
1327 }
1328 }
1329
1330 static int __net_init ip6gre_init_net(struct net *net)
1331 {
1332 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1333 int err;
1334
1335 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1336 ip6gre_tunnel_setup);
1337 if (!ign->fb_tunnel_dev) {
1338 err = -ENOMEM;
1339 goto err_alloc_dev;
1340 }
1341 dev_net_set(ign->fb_tunnel_dev, net);
1342 /* FB netdevice is special: we have one, and only one per netns.
1343 * Allowing to move it to another netns is clearly unsafe.
1344 */
1345 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1346
1347
1348 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1349 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1350
1351 err = register_netdev(ign->fb_tunnel_dev);
1352 if (err)
1353 goto err_reg_dev;
1354
1355 rcu_assign_pointer(ign->tunnels_wc[0],
1356 netdev_priv(ign->fb_tunnel_dev));
1357 return 0;
1358
1359 err_reg_dev:
1360 ip6gre_dev_free(ign->fb_tunnel_dev);
1361 err_alloc_dev:
1362 return err;
1363 }
1364
1365 static void __net_exit ip6gre_exit_net(struct net *net)
1366 {
1367 LIST_HEAD(list);
1368
1369 rtnl_lock();
1370 ip6gre_destroy_tunnels(net, &list);
1371 unregister_netdevice_many(&list);
1372 rtnl_unlock();
1373 }
1374
1375 static struct pernet_operations ip6gre_net_ops = {
1376 .init = ip6gre_init_net,
1377 .exit = ip6gre_exit_net,
1378 .id = &ip6gre_net_id,
1379 .size = sizeof(struct ip6gre_net),
1380 };
1381
1382 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
1383 {
1384 __be16 flags;
1385
1386 if (!data)
1387 return 0;
1388
1389 flags = 0;
1390 if (data[IFLA_GRE_IFLAGS])
1391 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1392 if (data[IFLA_GRE_OFLAGS])
1393 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1394 if (flags & (GRE_VERSION|GRE_ROUTING))
1395 return -EINVAL;
1396
1397 return 0;
1398 }
1399
1400 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
1401 {
1402 struct in6_addr daddr;
1403
1404 if (tb[IFLA_ADDRESS]) {
1405 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1406 return -EINVAL;
1407 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1408 return -EADDRNOTAVAIL;
1409 }
1410
1411 if (!data)
1412 goto out;
1413
1414 if (data[IFLA_GRE_REMOTE]) {
1415 nla_memcpy(&daddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1416 if (ipv6_addr_any(&daddr))
1417 return -EINVAL;
1418 }
1419
1420 out:
1421 return ip6gre_tunnel_validate(tb, data);
1422 }
1423
1424
1425 static void ip6gre_netlink_parms(struct nlattr *data[],
1426 struct __ip6_tnl_parm *parms)
1427 {
1428 memset(parms, 0, sizeof(*parms));
1429
1430 if (!data)
1431 return;
1432
1433 if (data[IFLA_GRE_LINK])
1434 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1435
1436 if (data[IFLA_GRE_IFLAGS])
1437 parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]);
1438
1439 if (data[IFLA_GRE_OFLAGS])
1440 parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]);
1441
1442 if (data[IFLA_GRE_IKEY])
1443 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1444
1445 if (data[IFLA_GRE_OKEY])
1446 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1447
1448 if (data[IFLA_GRE_LOCAL])
1449 nla_memcpy(&parms->laddr, data[IFLA_GRE_LOCAL], sizeof(struct in6_addr));
1450
1451 if (data[IFLA_GRE_REMOTE])
1452 nla_memcpy(&parms->raddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1453
1454 if (data[IFLA_GRE_TTL])
1455 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1456
1457 if (data[IFLA_GRE_ENCAP_LIMIT])
1458 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1459
1460 if (data[IFLA_GRE_FLOWINFO])
1461 parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]);
1462
1463 if (data[IFLA_GRE_FLAGS])
1464 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1465 }
1466
1467 static int ip6gre_tap_init(struct net_device *dev)
1468 {
1469 struct ip6_tnl *tunnel;
1470
1471 tunnel = netdev_priv(dev);
1472
1473 tunnel->dev = dev;
1474 tunnel->net = dev_net(dev);
1475 strcpy(tunnel->parms.name, dev->name);
1476
1477 ip6gre_tnl_link_config(tunnel, 1);
1478
1479 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1480 if (!dev->tstats)
1481 return -ENOMEM;
1482
1483 return 0;
1484 }
1485
1486 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1487 .ndo_init = ip6gre_tap_init,
1488 .ndo_uninit = ip6gre_tunnel_uninit,
1489 .ndo_start_xmit = ip6gre_tunnel_xmit,
1490 .ndo_set_mac_address = eth_mac_addr,
1491 .ndo_validate_addr = eth_validate_addr,
1492 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1493 .ndo_get_stats64 = ip_tunnel_get_stats64,
1494 };
1495
1496 static void ip6gre_tap_setup(struct net_device *dev)
1497 {
1498
1499 ether_setup(dev);
1500
1501 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1502 dev->destructor = ip6gre_dev_free;
1503
1504 dev->iflink = 0;
1505 dev->features |= NETIF_F_NETNS_LOCAL;
1506 }
1507
1508 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1509 struct nlattr *tb[], struct nlattr *data[])
1510 {
1511 struct ip6_tnl *nt;
1512 struct net *net = dev_net(dev);
1513 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1514 int err;
1515
1516 nt = netdev_priv(dev);
1517 ip6gre_netlink_parms(data, &nt->parms);
1518
1519 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1520 return -EEXIST;
1521
1522 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1523 eth_hw_addr_random(dev);
1524
1525 nt->dev = dev;
1526 nt->net = dev_net(dev);
1527 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1528
1529 /* Can use a lockless transmit, unless we generate output sequences */
1530 if (!(nt->parms.o_flags & GRE_SEQ))
1531 dev->features |= NETIF_F_LLTX;
1532
1533 err = register_netdevice(dev);
1534 if (err)
1535 goto out;
1536
1537 dev_hold(dev);
1538 ip6gre_tunnel_link(ign, nt);
1539
1540 out:
1541 return err;
1542 }
1543
1544 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1545 struct nlattr *data[])
1546 {
1547 struct ip6_tnl *t, *nt = netdev_priv(dev);
1548 struct net *net = nt->net;
1549 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1550 struct __ip6_tnl_parm p;
1551
1552 if (dev == ign->fb_tunnel_dev)
1553 return -EINVAL;
1554
1555 ip6gre_netlink_parms(data, &p);
1556
1557 t = ip6gre_tunnel_locate(net, &p, 0);
1558
1559 if (t) {
1560 if (t->dev != dev)
1561 return -EEXIST;
1562 } else {
1563 t = nt;
1564
1565 ip6gre_tunnel_unlink(ign, t);
1566 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1567 ip6gre_tunnel_link(ign, t);
1568 netdev_state_change(dev);
1569 }
1570
1571 return 0;
1572 }
1573
1574 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
1575 {
1576 struct net *net = dev_net(dev);
1577 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1578
1579 if (dev != ign->fb_tunnel_dev)
1580 unregister_netdevice_queue(dev, head);
1581 }
1582
1583 static size_t ip6gre_get_size(const struct net_device *dev)
1584 {
1585 return
1586 /* IFLA_GRE_LINK */
1587 nla_total_size(4) +
1588 /* IFLA_GRE_IFLAGS */
1589 nla_total_size(2) +
1590 /* IFLA_GRE_OFLAGS */
1591 nla_total_size(2) +
1592 /* IFLA_GRE_IKEY */
1593 nla_total_size(4) +
1594 /* IFLA_GRE_OKEY */
1595 nla_total_size(4) +
1596 /* IFLA_GRE_LOCAL */
1597 nla_total_size(sizeof(struct in6_addr)) +
1598 /* IFLA_GRE_REMOTE */
1599 nla_total_size(sizeof(struct in6_addr)) +
1600 /* IFLA_GRE_TTL */
1601 nla_total_size(1) +
1602 /* IFLA_GRE_TOS */
1603 nla_total_size(1) +
1604 /* IFLA_GRE_ENCAP_LIMIT */
1605 nla_total_size(1) +
1606 /* IFLA_GRE_FLOWINFO */
1607 nla_total_size(4) +
1608 /* IFLA_GRE_FLAGS */
1609 nla_total_size(4) +
1610 0;
1611 }
1612
1613 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1614 {
1615 struct ip6_tnl *t = netdev_priv(dev);
1616 struct __ip6_tnl_parm *p = &t->parms;
1617
1618 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1619 nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) ||
1620 nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) ||
1621 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1622 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
1623 nla_put(skb, IFLA_GRE_LOCAL, sizeof(struct in6_addr), &p->laddr) ||
1624 nla_put(skb, IFLA_GRE_REMOTE, sizeof(struct in6_addr), &p->raddr) ||
1625 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1626 /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/
1627 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1628 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1629 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags))
1630 goto nla_put_failure;
1631 return 0;
1632
1633 nla_put_failure:
1634 return -EMSGSIZE;
1635 }
1636
1637 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1638 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1639 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1640 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1641 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1642 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1643 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1644 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1645 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1646 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1647 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1648 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1649 };
1650
1651 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1652 .kind = "ip6gre",
1653 .maxtype = IFLA_GRE_MAX,
1654 .policy = ip6gre_policy,
1655 .priv_size = sizeof(struct ip6_tnl),
1656 .setup = ip6gre_tunnel_setup,
1657 .validate = ip6gre_tunnel_validate,
1658 .newlink = ip6gre_newlink,
1659 .changelink = ip6gre_changelink,
1660 .dellink = ip6gre_dellink,
1661 .get_size = ip6gre_get_size,
1662 .fill_info = ip6gre_fill_info,
1663 };
1664
1665 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1666 .kind = "ip6gretap",
1667 .maxtype = IFLA_GRE_MAX,
1668 .policy = ip6gre_policy,
1669 .priv_size = sizeof(struct ip6_tnl),
1670 .setup = ip6gre_tap_setup,
1671 .validate = ip6gre_tap_validate,
1672 .newlink = ip6gre_newlink,
1673 .changelink = ip6gre_changelink,
1674 .get_size = ip6gre_get_size,
1675 .fill_info = ip6gre_fill_info,
1676 };
1677
1678 /*
1679 * And now the modules code and kernel interface.
1680 */
1681
1682 static int __init ip6gre_init(void)
1683 {
1684 int err;
1685
1686 pr_info("GRE over IPv6 tunneling driver\n");
1687
1688 err = register_pernet_device(&ip6gre_net_ops);
1689 if (err < 0)
1690 return err;
1691
1692 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1693 if (err < 0) {
1694 pr_info("%s: can't add protocol\n", __func__);
1695 goto add_proto_failed;
1696 }
1697
1698 err = rtnl_link_register(&ip6gre_link_ops);
1699 if (err < 0)
1700 goto rtnl_link_failed;
1701
1702 err = rtnl_link_register(&ip6gre_tap_ops);
1703 if (err < 0)
1704 goto tap_ops_failed;
1705
1706 out:
1707 return err;
1708
1709 tap_ops_failed:
1710 rtnl_link_unregister(&ip6gre_link_ops);
1711 rtnl_link_failed:
1712 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1713 add_proto_failed:
1714 unregister_pernet_device(&ip6gre_net_ops);
1715 goto out;
1716 }
1717
1718 static void __exit ip6gre_fini(void)
1719 {
1720 rtnl_link_unregister(&ip6gre_tap_ops);
1721 rtnl_link_unregister(&ip6gre_link_ops);
1722 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1723 unregister_pernet_device(&ip6gre_net_ops);
1724 }
1725
1726 module_init(ip6gre_init);
1727 module_exit(ip6gre_fini);
1728 MODULE_LICENSE("GPL");
1729 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1730 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1731 MODULE_ALIAS_RTNL_LINK("ip6gre");
1732 MODULE_ALIAS_NETDEV("ip6gre0");
Linux kernel - Deliverables
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