?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Linux 4.1.16
[linux/fpc-iii.git] / net / ipv6 / ip6_gre.c
blob76be7d311cc4e1d40af8c23d6a3028db06beda16
1 /*
2 * GRE over IPv6 protocol decoder.
3 *
4 * Authors: Dmitry Kozlov (xeb@mail.ru)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 */
12
13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15 #include <linux/capability.h>
16 #include <linux/module.h>
17 #include <linux/types.h>
18 #include <linux/kernel.h>
19 #include <linux/slab.h>
20 #include <linux/uaccess.h>
21 #include <linux/skbuff.h>
22 #include <linux/netdevice.h>
23 #include <linux/in.h>
24 #include <linux/tcp.h>
25 #include <linux/udp.h>
26 #include <linux/if_arp.h>
27 #include <linux/mroute.h>
28 #include <linux/init.h>
29 #include <linux/in6.h>
30 #include <linux/inetdevice.h>
31 #include <linux/igmp.h>
32 #include <linux/netfilter_ipv4.h>
33 #include <linux/etherdevice.h>
34 #include <linux/if_ether.h>
35 #include <linux/hash.h>
36 #include <linux/if_tunnel.h>
37 #include <linux/ip6_tunnel.h>
38
39 #include <net/sock.h>
40 #include <net/ip.h>
41 #include <net/ip_tunnels.h>
42 #include <net/icmp.h>
43 #include <net/protocol.h>
44 #include <net/addrconf.h>
45 #include <net/arp.h>
46 #include <net/checksum.h>
47 #include <net/dsfield.h>
48 #include <net/inet_ecn.h>
49 #include <net/xfrm.h>
50 #include <net/net_namespace.h>
51 #include <net/netns/generic.h>
52 #include <net/rtnetlink.h>
53
54 #include <net/ipv6.h>
55 #include <net/ip6_fib.h>
56 #include <net/ip6_route.h>
57 #include <net/ip6_tunnel.h>
58
59
60 static bool log_ecn_error = true;
61 module_param(log_ecn_error, bool, 0644);
62 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
63
64 #define HASH_SIZE_SHIFT 5
65 #define HASH_SIZE (1 << HASH_SIZE_SHIFT)
66
67 static int ip6gre_net_id __read_mostly;
68 struct ip6gre_net {
69 struct ip6_tnl __rcu *tunnels[4][HASH_SIZE];
70
71 struct net_device *fb_tunnel_dev;
72 };
73
74 static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
75 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
76 static int ip6gre_tunnel_init(struct net_device *dev);
77 static void ip6gre_tunnel_setup(struct net_device *dev);
78 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
79 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
80
81 /* Tunnel hash table */
82
83 /*
84 4 hash tables:
85
86 3: (remote,local)
87 2: (remote,*)
88 1: (*,local)
89 0: (*,*)
90
91 We require exact key match i.e. if a key is present in packet
92 it will match only tunnel with the same key; if it is not present,
93 it will match only keyless tunnel.
94
95 All keysless packets, if not matched configured keyless tunnels
96 will match fallback tunnel.
97 */
98
99 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(HASH_SIZE - 1))
100 static u32 HASH_ADDR(const struct in6_addr *addr)
101 {
102 u32 hash = ipv6_addr_hash(addr);
103
104 return hash_32(hash, HASH_SIZE_SHIFT);
105 }
106
107 #define tunnels_r_l tunnels[3]
108 #define tunnels_r tunnels[2]
109 #define tunnels_l tunnels[1]
110 #define tunnels_wc tunnels[0]
111
112 /* Given src, dst and key, find appropriate for input tunnel. */
113
114 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
115 const struct in6_addr *remote, const struct in6_addr *local,
116 __be32 key, __be16 gre_proto)
117 {
118 struct net *net = dev_net(dev);
119 int link = dev->ifindex;
120 unsigned int h0 = HASH_ADDR(remote);
121 unsigned int h1 = HASH_KEY(key);
122 struct ip6_tnl *t, *cand = NULL;
123 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
124 int dev_type = (gre_proto == htons(ETH_P_TEB)) ?
125 ARPHRD_ETHER : ARPHRD_IP6GRE;
126 int score, cand_score = 4;
127
128 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
129 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
130 !ipv6_addr_equal(remote, &t->parms.raddr) ||
131 key != t->parms.i_key ||
132 !(t->dev->flags & IFF_UP))
133 continue;
134
135 if (t->dev->type != ARPHRD_IP6GRE &&
136 t->dev->type != dev_type)
137 continue;
138
139 score = 0;
140 if (t->parms.link != link)
141 score |= 1;
142 if (t->dev->type != dev_type)
143 score |= 2;
144 if (score == 0)
145 return t;
146
147 if (score < cand_score) {
148 cand = t;
149 cand_score = score;
150 }
151 }
152
153 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
154 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
155 key != t->parms.i_key ||
156 !(t->dev->flags & IFF_UP))
157 continue;
158
159 if (t->dev->type != ARPHRD_IP6GRE &&
160 t->dev->type != dev_type)
161 continue;
162
163 score = 0;
164 if (t->parms.link != link)
165 score |= 1;
166 if (t->dev->type != dev_type)
167 score |= 2;
168 if (score == 0)
169 return t;
170
171 if (score < cand_score) {
172 cand = t;
173 cand_score = score;
174 }
175 }
176
177 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
178 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
179 (!ipv6_addr_equal(local, &t->parms.raddr) ||
180 !ipv6_addr_is_multicast(local))) ||
181 key != t->parms.i_key ||
182 !(t->dev->flags & IFF_UP))
183 continue;
184
185 if (t->dev->type != ARPHRD_IP6GRE &&
186 t->dev->type != dev_type)
187 continue;
188
189 score = 0;
190 if (t->parms.link != link)
191 score |= 1;
192 if (t->dev->type != dev_type)
193 score |= 2;
194 if (score == 0)
195 return t;
196
197 if (score < cand_score) {
198 cand = t;
199 cand_score = score;
200 }
201 }
202
203 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
204 if (t->parms.i_key != key ||
205 !(t->dev->flags & IFF_UP))
206 continue;
207
208 if (t->dev->type != ARPHRD_IP6GRE &&
209 t->dev->type != dev_type)
210 continue;
211
212 score = 0;
213 if (t->parms.link != link)
214 score |= 1;
215 if (t->dev->type != dev_type)
216 score |= 2;
217 if (score == 0)
218 return t;
219
220 if (score < cand_score) {
221 cand = t;
222 cand_score = score;
223 }
224 }
225
226 if (cand)
227 return cand;
228
229 dev = ign->fb_tunnel_dev;
230 if (dev->flags & IFF_UP)
231 return netdev_priv(dev);
232
233 return NULL;
234 }
235
236 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
237 const struct __ip6_tnl_parm *p)
238 {
239 const struct in6_addr *remote = &p->raddr;
240 const struct in6_addr *local = &p->laddr;
241 unsigned int h = HASH_KEY(p->i_key);
242 int prio = 0;
243
244 if (!ipv6_addr_any(local))
245 prio |= 1;
246 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
247 prio |= 2;
248 h ^= HASH_ADDR(remote);
249 }
250
251 return &ign->tunnels[prio][h];
252 }
253
254 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
255 const struct ip6_tnl *t)
256 {
257 return __ip6gre_bucket(ign, &t->parms);
258 }
259
260 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
261 {
262 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
263
264 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
265 rcu_assign_pointer(*tp, t);
266 }
267
268 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
269 {
270 struct ip6_tnl __rcu **tp;
271 struct ip6_tnl *iter;
272
273 for (tp = ip6gre_bucket(ign, t);
274 (iter = rtnl_dereference(*tp)) != NULL;
275 tp = &iter->next) {
276 if (t == iter) {
277 rcu_assign_pointer(*tp, t->next);
278 break;
279 }
280 }
281 }
282
283 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
284 const struct __ip6_tnl_parm *parms,
285 int type)
286 {
287 const struct in6_addr *remote = &parms->raddr;
288 const struct in6_addr *local = &parms->laddr;
289 __be32 key = parms->i_key;
290 int link = parms->link;
291 struct ip6_tnl *t;
292 struct ip6_tnl __rcu **tp;
293 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
294
295 for (tp = __ip6gre_bucket(ign, parms);
296 (t = rtnl_dereference(*tp)) != NULL;
297 tp = &t->next)
298 if (ipv6_addr_equal(local, &t->parms.laddr) &&
299 ipv6_addr_equal(remote, &t->parms.raddr) &&
300 key == t->parms.i_key &&
301 link == t->parms.link &&
302 type == t->dev->type)
303 break;
304
305 return t;
306 }
307
308 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
309 const struct __ip6_tnl_parm *parms, int create)
310 {
311 struct ip6_tnl *t, *nt;
312 struct net_device *dev;
313 char name[IFNAMSIZ];
314 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
315
316 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
317 if (t && create)
318 return NULL;
319 if (t || !create)
320 return t;
321
322 if (parms->name[0])
323 strlcpy(name, parms->name, IFNAMSIZ);
324 else
325 strcpy(name, "ip6gre%d");
326
327 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
328 ip6gre_tunnel_setup);
329 if (!dev)
330 return NULL;
331
332 dev_net_set(dev, net);
333
334 nt = netdev_priv(dev);
335 nt->parms = *parms;
336 dev->rtnl_link_ops = &ip6gre_link_ops;
337
338 nt->dev = dev;
339 nt->net = dev_net(dev);
340 ip6gre_tnl_link_config(nt, 1);
341
342 if (register_netdevice(dev) < 0)
343 goto failed_free;
344
345 /* Can use a lockless transmit, unless we generate output sequences */
346 if (!(nt->parms.o_flags & GRE_SEQ))
347 dev->features |= NETIF_F_LLTX;
348
349 dev_hold(dev);
350 ip6gre_tunnel_link(ign, nt);
351 return nt;
352
353 failed_free:
354 free_netdev(dev);
355 return NULL;
356 }
357
358 static void ip6gre_tunnel_uninit(struct net_device *dev)
359 {
360 struct ip6_tnl *t = netdev_priv(dev);
361 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
362
363 ip6gre_tunnel_unlink(ign, t);
364 ip6_tnl_dst_reset(t);
365 dev_put(dev);
366 }
367
368
369 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
370 u8 type, u8 code, int offset, __be32 info)
371 {
372 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
373 __be16 *p = (__be16 *)(skb->data + offset);
374 int grehlen = offset + 4;
375 struct ip6_tnl *t;
376 __be16 flags;
377
378 flags = p[0];
379 if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) {
380 if (flags&(GRE_VERSION|GRE_ROUTING))
381 return;
382 if (flags&GRE_KEY) {
383 grehlen += 4;
384 if (flags&GRE_CSUM)
385 grehlen += 4;
386 }
387 }
388
389 /* If only 8 bytes returned, keyed message will be dropped here */
390 if (!pskb_may_pull(skb, grehlen))
391 return;
392 ipv6h = (const struct ipv6hdr *)skb->data;
393 p = (__be16 *)(skb->data + offset);
394
395 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
396 flags & GRE_KEY ?
397 *(((__be32 *)p) + (grehlen / 4) - 1) : 0,
398 p[1]);
399 if (!t)
400 return;
401
402 switch (type) {
403 __u32 teli;
404 struct ipv6_tlv_tnl_enc_lim *tel;
405 __u32 mtu;
406 case ICMPV6_DEST_UNREACH:
407 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
408 t->parms.name);
409 break;
410 case ICMPV6_TIME_EXCEED:
411 if (code == ICMPV6_EXC_HOPLIMIT) {
412 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
413 t->parms.name);
414 }
415 break;
416 case ICMPV6_PARAMPROB:
417 teli = 0;
418 if (code == ICMPV6_HDR_FIELD)
419 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
420
421 if (teli && teli == be32_to_cpu(info) - 2) {
422 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
423 if (tel->encap_limit == 0) {
424 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
425 t->parms.name);
426 }
427 } else {
428 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
429 t->parms.name);
430 }
431 break;
432 case ICMPV6_PKT_TOOBIG:
433 mtu = be32_to_cpu(info) - offset;
434 if (mtu < IPV6_MIN_MTU)
435 mtu = IPV6_MIN_MTU;
436 t->dev->mtu = mtu;
437 break;
438 }
439
440 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
441 t->err_count++;
442 else
443 t->err_count = 1;
444 t->err_time = jiffies;
445 }
446
447 static int ip6gre_rcv(struct sk_buff *skb)
448 {
449 const struct ipv6hdr *ipv6h;
450 u8 *h;
451 __be16 flags;
452 __sum16 csum = 0;
453 __be32 key = 0;
454 u32 seqno = 0;
455 struct ip6_tnl *tunnel;
456 int offset = 4;
457 __be16 gre_proto;
458 int err;
459
460 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
461 goto drop;
462
463 ipv6h = ipv6_hdr(skb);
464 h = skb->data;
465 flags = *(__be16 *)h;
466
467 if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) {
468 /* - Version must be 0.
469 - We do not support routing headers.
470 */
471 if (flags&(GRE_VERSION|GRE_ROUTING))
472 goto drop;
473
474 if (flags&GRE_CSUM) {
475 csum = skb_checksum_simple_validate(skb);
476 offset += 4;
477 }
478 if (flags&GRE_KEY) {
479 key = *(__be32 *)(h + offset);
480 offset += 4;
481 }
482 if (flags&GRE_SEQ) {
483 seqno = ntohl(*(__be32 *)(h + offset));
484 offset += 4;
485 }
486 }
487
488 gre_proto = *(__be16 *)(h + 2);
489
490 tunnel = ip6gre_tunnel_lookup(skb->dev,
491 &ipv6h->saddr, &ipv6h->daddr, key,
492 gre_proto);
493 if (tunnel) {
494 struct pcpu_sw_netstats *tstats;
495
496 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
497 goto drop;
498
499 if (!ip6_tnl_rcv_ctl(tunnel, &ipv6h->daddr, &ipv6h->saddr)) {
500 tunnel->dev->stats.rx_dropped++;
501 goto drop;
502 }
503
504 skb->protocol = gre_proto;
505 /* WCCP version 1 and 2 protocol decoding.
506 * - Change protocol to IPv6
507 * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
508 */
509 if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) {
510 skb->protocol = htons(ETH_P_IPV6);
511 if ((*(h + offset) & 0xF0) != 0x40)
512 offset += 4;
513 }
514
515 skb->mac_header = skb->network_header;
516 __pskb_pull(skb, offset);
517 skb_postpull_rcsum(skb, skb_transport_header(skb), offset);
518
519 if (((flags&GRE_CSUM) && csum) ||
520 (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) {
521 tunnel->dev->stats.rx_crc_errors++;
522 tunnel->dev->stats.rx_errors++;
523 goto drop;
524 }
525 if (tunnel->parms.i_flags&GRE_SEQ) {
526 if (!(flags&GRE_SEQ) ||
527 (tunnel->i_seqno &&
528 (s32)(seqno - tunnel->i_seqno) < 0)) {
529 tunnel->dev->stats.rx_fifo_errors++;
530 tunnel->dev->stats.rx_errors++;
531 goto drop;
532 }
533 tunnel->i_seqno = seqno + 1;
534 }
535
536 /* Warning: All skb pointers will be invalidated! */
537 if (tunnel->dev->type == ARPHRD_ETHER) {
538 if (!pskb_may_pull(skb, ETH_HLEN)) {
539 tunnel->dev->stats.rx_length_errors++;
540 tunnel->dev->stats.rx_errors++;
541 goto drop;
542 }
543
544 ipv6h = ipv6_hdr(skb);
545 skb->protocol = eth_type_trans(skb, tunnel->dev);
546 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
547 }
548
549 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
550
551 skb_reset_network_header(skb);
552
553 err = IP6_ECN_decapsulate(ipv6h, skb);
554 if (unlikely(err)) {
555 if (log_ecn_error)
556 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
557 &ipv6h->saddr,
558 ipv6_get_dsfield(ipv6h));
559 if (err > 1) {
560 ++tunnel->dev->stats.rx_frame_errors;
561 ++tunnel->dev->stats.rx_errors;
562 goto drop;
563 }
564 }
565
566 tstats = this_cpu_ptr(tunnel->dev->tstats);
567 u64_stats_update_begin(&tstats->syncp);
568 tstats->rx_packets++;
569 tstats->rx_bytes += skb->len;
570 u64_stats_update_end(&tstats->syncp);
571
572 netif_rx(skb);
573
574 return 0;
575 }
576 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
577
578 drop:
579 kfree_skb(skb);
580 return 0;
581 }
582
583 struct ipv6_tel_txoption {
584 struct ipv6_txoptions ops;
585 __u8 dst_opt[8];
586 };
587
588 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
589 {
590 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
591
592 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
593 opt->dst_opt[3] = 1;
594 opt->dst_opt[4] = encap_limit;
595 opt->dst_opt[5] = IPV6_TLV_PADN;
596 opt->dst_opt[6] = 1;
597
598 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
599 opt->ops.opt_nflen = 8;
600 }
601
602 static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
603 struct net_device *dev,
604 __u8 dsfield,
605 struct flowi6 *fl6,
606 int encap_limit,
607 __u32 *pmtu)
608 {
609 struct ip6_tnl *tunnel = netdev_priv(dev);
610 struct net *net = tunnel->net;
611 struct net_device *tdev; /* Device to other host */
612 struct ipv6hdr *ipv6h; /* Our new IP header */
613 unsigned int max_headroom = 0; /* The extra header space needed */
614 int gre_hlen;
615 struct ipv6_tel_txoption opt;
616 int mtu;
617 struct dst_entry *dst = NULL, *ndst = NULL;
618 struct net_device_stats *stats = &tunnel->dev->stats;
619 int err = -1;
620 u8 proto;
621 struct sk_buff *new_skb;
622 __be16 protocol;
623
624 if (dev->type == ARPHRD_ETHER)
625 IPCB(skb)->flags = 0;
626
627 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) {
628 gre_hlen = 0;
629 ipv6h = (struct ipv6hdr *)skb->data;
630 fl6->daddr = ipv6h->daddr;
631 } else {
632 gre_hlen = tunnel->hlen;
633 fl6->daddr = tunnel->parms.raddr;
634 }
635
636 if (!fl6->flowi6_mark)
637 dst = ip6_tnl_dst_check(tunnel);
638
639 if (!dst) {
640 ndst = ip6_route_output(net, NULL, fl6);
641
642 if (ndst->error)
643 goto tx_err_link_failure;
644 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
645 if (IS_ERR(ndst)) {
646 err = PTR_ERR(ndst);
647 ndst = NULL;
648 goto tx_err_link_failure;
649 }
650 dst = ndst;
651 }
652
653 tdev = dst->dev;
654
655 if (tdev == dev) {
656 stats->collisions++;
657 net_warn_ratelimited("%s: Local routing loop detected!\n",
658 tunnel->parms.name);
659 goto tx_err_dst_release;
660 }
661
662 mtu = dst_mtu(dst) - sizeof(*ipv6h);
663 if (encap_limit >= 0) {
664 max_headroom += 8;
665 mtu -= 8;
666 }
667 if (mtu < IPV6_MIN_MTU)
668 mtu = IPV6_MIN_MTU;
669 if (skb_dst(skb))
670 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
671 if (skb->len > mtu) {
672 *pmtu = mtu;
673 err = -EMSGSIZE;
674 goto tx_err_dst_release;
675 }
676
677 if (tunnel->err_count > 0) {
678 if (time_before(jiffies,
679 tunnel->err_time + IP6TUNNEL_ERR_TIMEO)) {
680 tunnel->err_count--;
681
682 dst_link_failure(skb);
683 } else
684 tunnel->err_count = 0;
685 }
686
687 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
688
689 max_headroom += LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len;
690
691 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
692 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
693 new_skb = skb_realloc_headroom(skb, max_headroom);
694 if (max_headroom > dev->needed_headroom)
695 dev->needed_headroom = max_headroom;
696 if (!new_skb)
697 goto tx_err_dst_release;
698
699 if (skb->sk)
700 skb_set_owner_w(new_skb, skb->sk);
701 consume_skb(skb);
702 skb = new_skb;
703 }
704
705 if (fl6->flowi6_mark) {
706 skb_dst_set(skb, dst);
707 ndst = NULL;
708 } else {
709 skb_dst_set_noref(skb, dst);
710 }
711
712 proto = NEXTHDR_GRE;
713 if (encap_limit >= 0) {
714 init_tel_txopt(&opt, encap_limit);
715 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
716 }
717
718 if (likely(!skb->encapsulation)) {
719 skb_reset_inner_headers(skb);
720 skb->encapsulation = 1;
721 }
722
723 skb_push(skb, gre_hlen);
724 skb_reset_network_header(skb);
725 skb_set_transport_header(skb, sizeof(*ipv6h));
726
727 /*
728 * Push down and install the IP header.
729 */
730 ipv6h = ipv6_hdr(skb);
731 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield),
732 ip6_make_flowlabel(net, skb, fl6->flowlabel, false));
733 ipv6h->hop_limit = tunnel->parms.hop_limit;
734 ipv6h->nexthdr = proto;
735 ipv6h->saddr = fl6->saddr;
736 ipv6h->daddr = fl6->daddr;
737
738 ((__be16 *)(ipv6h + 1))[0] = tunnel->parms.o_flags;
739 protocol = (dev->type == ARPHRD_ETHER) ?
740 htons(ETH_P_TEB) : skb->protocol;
741 ((__be16 *)(ipv6h + 1))[1] = protocol;
742
743 if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) {
744 __be32 *ptr = (__be32 *)(((u8 *)ipv6h) + tunnel->hlen - 4);
745
746 if (tunnel->parms.o_flags&GRE_SEQ) {
747 ++tunnel->o_seqno;
748 *ptr = htonl(tunnel->o_seqno);
749 ptr--;
750 }
751 if (tunnel->parms.o_flags&GRE_KEY) {
752 *ptr = tunnel->parms.o_key;
753 ptr--;
754 }
755 if (tunnel->parms.o_flags&GRE_CSUM) {
756 *ptr = 0;
757 *(__sum16 *)ptr = ip_compute_csum((void *)(ipv6h+1),
758 skb->len - sizeof(struct ipv6hdr));
759 }
760 }
761
762 skb_set_inner_protocol(skb, protocol);
763
764 ip6tunnel_xmit(NULL, 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_GRE;
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_GRE;
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, &t->parms.laddr, &t->parms.raddr))
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 /* Precalculate GRE options length */
966 if (t->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) {
967 if (t->parms.o_flags&GRE_CSUM)
968 addend += 4;
969 if (t->parms.o_flags&GRE_KEY)
970 addend += 4;
971 if (t->parms.o_flags&GRE_SEQ)
972 addend += 4;
973 }
974 t->hlen = addend;
975
976 if (p->flags & IP6_TNL_F_CAP_XMIT) {
977 int strict = (ipv6_addr_type(&p->raddr) &
978 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
979
980 struct rt6_info *rt = rt6_lookup(t->net,
981 &p->raddr, &p->laddr,
982 p->link, strict);
983
984 if (!rt)
985 return;
986
987 if (rt->dst.dev) {
988 dev->hard_header_len = rt->dst.dev->hard_header_len + addend;
989
990 if (set_mtu) {
991 dev->mtu = rt->dst.dev->mtu - addend;
992 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
993 dev->mtu -= 8;
994
995 if (dev->mtu < IPV6_MIN_MTU)
996 dev->mtu = IPV6_MIN_MTU;
997 }
998 }
999 ip6_rt_put(rt);
1000 }
1001 }
1002
1003 static int ip6gre_tnl_change(struct ip6_tnl *t,
1004 const struct __ip6_tnl_parm *p, int set_mtu)
1005 {
1006 t->parms.laddr = p->laddr;
1007 t->parms.raddr = p->raddr;
1008 t->parms.flags = p->flags;
1009 t->parms.hop_limit = p->hop_limit;
1010 t->parms.encap_limit = p->encap_limit;
1011 t->parms.flowinfo = p->flowinfo;
1012 t->parms.link = p->link;
1013 t->parms.proto = p->proto;
1014 t->parms.i_key = p->i_key;
1015 t->parms.o_key = p->o_key;
1016 t->parms.i_flags = p->i_flags;
1017 t->parms.o_flags = p->o_flags;
1018 ip6_tnl_dst_reset(t);
1019 ip6gre_tnl_link_config(t, set_mtu);
1020 return 0;
1021 }
1022
1023 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1024 const struct ip6_tnl_parm2 *u)
1025 {
1026 p->laddr = u->laddr;
1027 p->raddr = u->raddr;
1028 p->flags = u->flags;
1029 p->hop_limit = u->hop_limit;
1030 p->encap_limit = u->encap_limit;
1031 p->flowinfo = u->flowinfo;
1032 p->link = u->link;
1033 p->i_key = u->i_key;
1034 p->o_key = u->o_key;
1035 p->i_flags = u->i_flags;
1036 p->o_flags = u->o_flags;
1037 memcpy(p->name, u->name, sizeof(u->name));
1038 }
1039
1040 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1041 const struct __ip6_tnl_parm *p)
1042 {
1043 u->proto = IPPROTO_GRE;
1044 u->laddr = p->laddr;
1045 u->raddr = p->raddr;
1046 u->flags = p->flags;
1047 u->hop_limit = p->hop_limit;
1048 u->encap_limit = p->encap_limit;
1049 u->flowinfo = p->flowinfo;
1050 u->link = p->link;
1051 u->i_key = p->i_key;
1052 u->o_key = p->o_key;
1053 u->i_flags = p->i_flags;
1054 u->o_flags = p->o_flags;
1055 memcpy(u->name, p->name, sizeof(u->name));
1056 }
1057
1058 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1059 struct ifreq *ifr, int cmd)
1060 {
1061 int err = 0;
1062 struct ip6_tnl_parm2 p;
1063 struct __ip6_tnl_parm p1;
1064 struct ip6_tnl *t = netdev_priv(dev);
1065 struct net *net = t->net;
1066 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1067
1068 switch (cmd) {
1069 case SIOCGETTUNNEL:
1070 if (dev == ign->fb_tunnel_dev) {
1071 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1072 err = -EFAULT;
1073 break;
1074 }
1075 ip6gre_tnl_parm_from_user(&p1, &p);
1076 t = ip6gre_tunnel_locate(net, &p1, 0);
1077 if (!t)
1078 t = netdev_priv(dev);
1079 }
1080 memset(&p, 0, sizeof(p));
1081 ip6gre_tnl_parm_to_user(&p, &t->parms);
1082 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1083 err = -EFAULT;
1084 break;
1085
1086 case SIOCADDTUNNEL:
1087 case SIOCCHGTUNNEL:
1088 err = -EPERM;
1089 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1090 goto done;
1091
1092 err = -EFAULT;
1093 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1094 goto done;
1095
1096 err = -EINVAL;
1097 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1098 goto done;
1099
1100 if (!(p.i_flags&GRE_KEY))
1101 p.i_key = 0;
1102 if (!(p.o_flags&GRE_KEY))
1103 p.o_key = 0;
1104
1105 ip6gre_tnl_parm_from_user(&p1, &p);
1106 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1107
1108 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1109 if (t) {
1110 if (t->dev != dev) {
1111 err = -EEXIST;
1112 break;
1113 }
1114 } else {
1115 t = netdev_priv(dev);
1116
1117 ip6gre_tunnel_unlink(ign, t);
1118 synchronize_net();
1119 ip6gre_tnl_change(t, &p1, 1);
1120 ip6gre_tunnel_link(ign, t);
1121 netdev_state_change(dev);
1122 }
1123 }
1124
1125 if (t) {
1126 err = 0;
1127
1128 memset(&p, 0, sizeof(p));
1129 ip6gre_tnl_parm_to_user(&p, &t->parms);
1130 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1131 err = -EFAULT;
1132 } else
1133 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1134 break;
1135
1136 case SIOCDELTUNNEL:
1137 err = -EPERM;
1138 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1139 goto done;
1140
1141 if (dev == ign->fb_tunnel_dev) {
1142 err = -EFAULT;
1143 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1144 goto done;
1145 err = -ENOENT;
1146 ip6gre_tnl_parm_from_user(&p1, &p);
1147 t = ip6gre_tunnel_locate(net, &p1, 0);
1148 if (!t)
1149 goto done;
1150 err = -EPERM;
1151 if (t == netdev_priv(ign->fb_tunnel_dev))
1152 goto done;
1153 dev = t->dev;
1154 }
1155 unregister_netdevice(dev);
1156 err = 0;
1157 break;
1158
1159 default:
1160 err = -EINVAL;
1161 }
1162
1163 done:
1164 return err;
1165 }
1166
1167 static int ip6gre_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1168 {
1169 if (new_mtu < 68 ||
1170 new_mtu > 0xFFF8 - dev->hard_header_len)
1171 return -EINVAL;
1172 dev->mtu = new_mtu;
1173 return 0;
1174 }
1175
1176 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1177 unsigned short type,
1178 const void *daddr, const void *saddr, unsigned int len)
1179 {
1180 struct ip6_tnl *t = netdev_priv(dev);
1181 struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen);
1182 __be16 *p = (__be16 *)(ipv6h+1);
1183
1184 ip6_flow_hdr(ipv6h, 0,
1185 ip6_make_flowlabel(dev_net(dev), skb,
1186 t->fl.u.ip6.flowlabel, false));
1187 ipv6h->hop_limit = t->parms.hop_limit;
1188 ipv6h->nexthdr = NEXTHDR_GRE;
1189 ipv6h->saddr = t->parms.laddr;
1190 ipv6h->daddr = t->parms.raddr;
1191
1192 p[0] = t->parms.o_flags;
1193 p[1] = htons(type);
1194
1195 /*
1196 * Set the source hardware address.
1197 */
1198
1199 if (saddr)
1200 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1201 if (daddr)
1202 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1203 if (!ipv6_addr_any(&ipv6h->daddr))
1204 return t->hlen;
1205
1206 return -t->hlen;
1207 }
1208
1209 static const struct header_ops ip6gre_header_ops = {
1210 .create = ip6gre_header,
1211 };
1212
1213 static const struct net_device_ops ip6gre_netdev_ops = {
1214 .ndo_init = ip6gre_tunnel_init,
1215 .ndo_uninit = ip6gre_tunnel_uninit,
1216 .ndo_start_xmit = ip6gre_tunnel_xmit,
1217 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1218 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1219 .ndo_get_stats64 = ip_tunnel_get_stats64,
1220 .ndo_get_iflink = ip6_tnl_get_iflink,
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->addr_len = sizeof(struct in6_addr);
1244 netif_keep_dst(dev);
1245 }
1246
1247 static int ip6gre_tunnel_init(struct net_device *dev)
1248 {
1249 struct ip6_tnl *tunnel;
1250
1251 tunnel = netdev_priv(dev);
1252
1253 tunnel->dev = dev;
1254 tunnel->net = dev_net(dev);
1255 strcpy(tunnel->parms.name, dev->name);
1256
1257 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1258 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1259
1260 if (ipv6_addr_any(&tunnel->parms.raddr))
1261 dev->header_ops = &ip6gre_header_ops;
1262
1263 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1264 if (!dev->tstats)
1265 return -ENOMEM;
1266
1267 return 0;
1268 }
1269
1270 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1271 {
1272 struct ip6_tnl *tunnel = netdev_priv(dev);
1273
1274 tunnel->dev = dev;
1275 tunnel->net = dev_net(dev);
1276 strcpy(tunnel->parms.name, dev->name);
1277
1278 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1279
1280 dev_hold(dev);
1281 }
1282
1283
1284 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1285 .handler = ip6gre_rcv,
1286 .err_handler = ip6gre_err,
1287 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1288 };
1289
1290 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1291 {
1292 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1293 struct net_device *dev, *aux;
1294 int prio;
1295
1296 for_each_netdev_safe(net, dev, aux)
1297 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1298 dev->rtnl_link_ops == &ip6gre_tap_ops)
1299 unregister_netdevice_queue(dev, head);
1300
1301 for (prio = 0; prio < 4; prio++) {
1302 int h;
1303 for (h = 0; h < HASH_SIZE; h++) {
1304 struct ip6_tnl *t;
1305
1306 t = rtnl_dereference(ign->tunnels[prio][h]);
1307
1308 while (t) {
1309 /* If dev is in the same netns, it has already
1310 * been added to the list by the previous loop.
1311 */
1312 if (!net_eq(dev_net(t->dev), net))
1313 unregister_netdevice_queue(t->dev,
1314 head);
1315 t = rtnl_dereference(t->next);
1316 }
1317 }
1318 }
1319 }
1320
1321 static int __net_init ip6gre_init_net(struct net *net)
1322 {
1323 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1324 int err;
1325
1326 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1327 NET_NAME_UNKNOWN,
1328 ip6gre_tunnel_setup);
1329 if (!ign->fb_tunnel_dev) {
1330 err = -ENOMEM;
1331 goto err_alloc_dev;
1332 }
1333 dev_net_set(ign->fb_tunnel_dev, net);
1334 /* FB netdevice is special: we have one, and only one per netns.
1335 * Allowing to move it to another netns is clearly unsafe.
1336 */
1337 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1338
1339
1340 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1341 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1342
1343 err = register_netdev(ign->fb_tunnel_dev);
1344 if (err)
1345 goto err_reg_dev;
1346
1347 rcu_assign_pointer(ign->tunnels_wc[0],
1348 netdev_priv(ign->fb_tunnel_dev));
1349 return 0;
1350
1351 err_reg_dev:
1352 ip6gre_dev_free(ign->fb_tunnel_dev);
1353 err_alloc_dev:
1354 return err;
1355 }
1356
1357 static void __net_exit ip6gre_exit_net(struct net *net)
1358 {
1359 LIST_HEAD(list);
1360
1361 rtnl_lock();
1362 ip6gre_destroy_tunnels(net, &list);
1363 unregister_netdevice_many(&list);
1364 rtnl_unlock();
1365 }
1366
1367 static struct pernet_operations ip6gre_net_ops = {
1368 .init = ip6gre_init_net,
1369 .exit = ip6gre_exit_net,
1370 .id = &ip6gre_net_id,
1371 .size = sizeof(struct ip6gre_net),
1372 };
1373
1374 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
1375 {
1376 __be16 flags;
1377
1378 if (!data)
1379 return 0;
1380
1381 flags = 0;
1382 if (data[IFLA_GRE_IFLAGS])
1383 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1384 if (data[IFLA_GRE_OFLAGS])
1385 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1386 if (flags & (GRE_VERSION|GRE_ROUTING))
1387 return -EINVAL;
1388
1389 return 0;
1390 }
1391
1392 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
1393 {
1394 struct in6_addr daddr;
1395
1396 if (tb[IFLA_ADDRESS]) {
1397 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1398 return -EINVAL;
1399 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1400 return -EADDRNOTAVAIL;
1401 }
1402
1403 if (!data)
1404 goto out;
1405
1406 if (data[IFLA_GRE_REMOTE]) {
1407 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1408 if (ipv6_addr_any(&daddr))
1409 return -EINVAL;
1410 }
1411
1412 out:
1413 return ip6gre_tunnel_validate(tb, data);
1414 }
1415
1416
1417 static void ip6gre_netlink_parms(struct nlattr *data[],
1418 struct __ip6_tnl_parm *parms)
1419 {
1420 memset(parms, 0, sizeof(*parms));
1421
1422 if (!data)
1423 return;
1424
1425 if (data[IFLA_GRE_LINK])
1426 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1427
1428 if (data[IFLA_GRE_IFLAGS])
1429 parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]);
1430
1431 if (data[IFLA_GRE_OFLAGS])
1432 parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]);
1433
1434 if (data[IFLA_GRE_IKEY])
1435 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1436
1437 if (data[IFLA_GRE_OKEY])
1438 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1439
1440 if (data[IFLA_GRE_LOCAL])
1441 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1442
1443 if (data[IFLA_GRE_REMOTE])
1444 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1445
1446 if (data[IFLA_GRE_TTL])
1447 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1448
1449 if (data[IFLA_GRE_ENCAP_LIMIT])
1450 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1451
1452 if (data[IFLA_GRE_FLOWINFO])
1453 parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]);
1454
1455 if (data[IFLA_GRE_FLAGS])
1456 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1457 }
1458
1459 static int ip6gre_tap_init(struct net_device *dev)
1460 {
1461 struct ip6_tnl *tunnel;
1462
1463 tunnel = netdev_priv(dev);
1464
1465 tunnel->dev = dev;
1466 tunnel->net = dev_net(dev);
1467 strcpy(tunnel->parms.name, dev->name);
1468
1469 ip6gre_tnl_link_config(tunnel, 1);
1470
1471 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1472 if (!dev->tstats)
1473 return -ENOMEM;
1474
1475 return 0;
1476 }
1477
1478 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1479 .ndo_init = ip6gre_tap_init,
1480 .ndo_uninit = ip6gre_tunnel_uninit,
1481 .ndo_start_xmit = ip6gre_tunnel_xmit,
1482 .ndo_set_mac_address = eth_mac_addr,
1483 .ndo_validate_addr = eth_validate_addr,
1484 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1485 .ndo_get_stats64 = ip_tunnel_get_stats64,
1486 .ndo_get_iflink = ip6_tnl_get_iflink,
1487 };
1488
1489 static void ip6gre_tap_setup(struct net_device *dev)
1490 {
1491
1492 ether_setup(dev);
1493
1494 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1495 dev->destructor = ip6gre_dev_free;
1496
1497 dev->features |= NETIF_F_NETNS_LOCAL;
1498 }
1499
1500 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1501 struct nlattr *tb[], struct nlattr *data[])
1502 {
1503 struct ip6_tnl *nt;
1504 struct net *net = dev_net(dev);
1505 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1506 int err;
1507
1508 nt = netdev_priv(dev);
1509 ip6gre_netlink_parms(data, &nt->parms);
1510
1511 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1512 return -EEXIST;
1513
1514 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1515 eth_hw_addr_random(dev);
1516
1517 nt->dev = dev;
1518 nt->net = dev_net(dev);
1519 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1520
1521 /* Can use a lockless transmit, unless we generate output sequences */
1522 if (!(nt->parms.o_flags & GRE_SEQ))
1523 dev->features |= NETIF_F_LLTX;
1524
1525 err = register_netdevice(dev);
1526 if (err)
1527 goto out;
1528
1529 dev_hold(dev);
1530 ip6gre_tunnel_link(ign, nt);
1531
1532 out:
1533 return err;
1534 }
1535
1536 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1537 struct nlattr *data[])
1538 {
1539 struct ip6_tnl *t, *nt = netdev_priv(dev);
1540 struct net *net = nt->net;
1541 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1542 struct __ip6_tnl_parm p;
1543
1544 if (dev == ign->fb_tunnel_dev)
1545 return -EINVAL;
1546
1547 ip6gre_netlink_parms(data, &p);
1548
1549 t = ip6gre_tunnel_locate(net, &p, 0);
1550
1551 if (t) {
1552 if (t->dev != dev)
1553 return -EEXIST;
1554 } else {
1555 t = nt;
1556 }
1557
1558 ip6gre_tunnel_unlink(ign, t);
1559 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1560 ip6gre_tunnel_link(ign, t);
1561 return 0;
1562 }
1563
1564 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
1565 {
1566 struct net *net = dev_net(dev);
1567 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1568
1569 if (dev != ign->fb_tunnel_dev)
1570 unregister_netdevice_queue(dev, head);
1571 }
1572
1573 static size_t ip6gre_get_size(const struct net_device *dev)
1574 {
1575 return
1576 /* IFLA_GRE_LINK */
1577 nla_total_size(4) +
1578 /* IFLA_GRE_IFLAGS */
1579 nla_total_size(2) +
1580 /* IFLA_GRE_OFLAGS */
1581 nla_total_size(2) +
1582 /* IFLA_GRE_IKEY */
1583 nla_total_size(4) +
1584 /* IFLA_GRE_OKEY */
1585 nla_total_size(4) +
1586 /* IFLA_GRE_LOCAL */
1587 nla_total_size(sizeof(struct in6_addr)) +
1588 /* IFLA_GRE_REMOTE */
1589 nla_total_size(sizeof(struct in6_addr)) +
1590 /* IFLA_GRE_TTL */
1591 nla_total_size(1) +
1592 /* IFLA_GRE_TOS */
1593 nla_total_size(1) +
1594 /* IFLA_GRE_ENCAP_LIMIT */
1595 nla_total_size(1) +
1596 /* IFLA_GRE_FLOWINFO */
1597 nla_total_size(4) +
1598 /* IFLA_GRE_FLAGS */
1599 nla_total_size(4) +
1600 0;
1601 }
1602
1603 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1604 {
1605 struct ip6_tnl *t = netdev_priv(dev);
1606 struct __ip6_tnl_parm *p = &t->parms;
1607
1608 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1609 nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) ||
1610 nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) ||
1611 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1612 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
1613 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
1614 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
1615 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1616 /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/
1617 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1618 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1619 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags))
1620 goto nla_put_failure;
1621 return 0;
1622
1623 nla_put_failure:
1624 return -EMSGSIZE;
1625 }
1626
1627 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1628 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1629 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1630 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1631 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1632 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1633 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1634 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1635 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1636 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1637 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1638 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1639 };
1640
1641 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1642 .kind = "ip6gre",
1643 .maxtype = IFLA_GRE_MAX,
1644 .policy = ip6gre_policy,
1645 .priv_size = sizeof(struct ip6_tnl),
1646 .setup = ip6gre_tunnel_setup,
1647 .validate = ip6gre_tunnel_validate,
1648 .newlink = ip6gre_newlink,
1649 .changelink = ip6gre_changelink,
1650 .dellink = ip6gre_dellink,
1651 .get_size = ip6gre_get_size,
1652 .fill_info = ip6gre_fill_info,
1653 .get_link_net = ip6_tnl_get_link_net,
1654 };
1655
1656 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1657 .kind = "ip6gretap",
1658 .maxtype = IFLA_GRE_MAX,
1659 .policy = ip6gre_policy,
1660 .priv_size = sizeof(struct ip6_tnl),
1661 .setup = ip6gre_tap_setup,
1662 .validate = ip6gre_tap_validate,
1663 .newlink = ip6gre_newlink,
1664 .changelink = ip6gre_changelink,
1665 .get_size = ip6gre_get_size,
1666 .fill_info = ip6gre_fill_info,
1667 .get_link_net = ip6_tnl_get_link_net,
1668 };
1669
1670 /*
1671 * And now the modules code and kernel interface.
1672 */
1673
1674 static int __init ip6gre_init(void)
1675 {
1676 int err;
1677
1678 pr_info("GRE over IPv6 tunneling driver\n");
1679
1680 err = register_pernet_device(&ip6gre_net_ops);
1681 if (err < 0)
1682 return err;
1683
1684 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1685 if (err < 0) {
1686 pr_info("%s: can't add protocol\n", __func__);
1687 goto add_proto_failed;
1688 }
1689
1690 err = rtnl_link_register(&ip6gre_link_ops);
1691 if (err < 0)
1692 goto rtnl_link_failed;
1693
1694 err = rtnl_link_register(&ip6gre_tap_ops);
1695 if (err < 0)
1696 goto tap_ops_failed;
1697
1698 out:
1699 return err;
1700
1701 tap_ops_failed:
1702 rtnl_link_unregister(&ip6gre_link_ops);
1703 rtnl_link_failed:
1704 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1705 add_proto_failed:
1706 unregister_pernet_device(&ip6gre_net_ops);
1707 goto out;
1708 }
1709
1710 static void __exit ip6gre_fini(void)
1711 {
1712 rtnl_link_unregister(&ip6gre_tap_ops);
1713 rtnl_link_unregister(&ip6gre_link_ops);
1714 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1715 unregister_pernet_device(&ip6gre_net_ops);
1716 }
1717
1718 module_init(ip6gre_init);
1719 module_exit(ip6gre_fini);
1720 MODULE_LICENSE("GPL");
1721 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1722 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1723 MODULE_ALIAS_RTNL_LINK("ip6gre");
1724 MODULE_ALIAS_RTNL_LINK("ip6gretap");
1725 MODULE_ALIAS_NETDEV("ip6gre0");
Linux with added FPC-III support