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[media] media-device: fix builds when USB or PCI is compiled as module
[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/init.h>
28 #include <linux/in6.h>
29 #include <linux/inetdevice.h>
30 #include <linux/igmp.h>
31 #include <linux/netfilter_ipv4.h>
32 #include <linux/etherdevice.h>
33 #include <linux/if_ether.h>
34 #include <linux/hash.h>
35 #include <linux/if_tunnel.h>
36 #include <linux/ip6_tunnel.h>
37
38 #include <net/sock.h>
39 #include <net/ip.h>
40 #include <net/ip_tunnels.h>
41 #include <net/icmp.h>
42 #include <net/protocol.h>
43 #include <net/addrconf.h>
44 #include <net/arp.h>
45 #include <net/checksum.h>
46 #include <net/dsfield.h>
47 #include <net/inet_ecn.h>
48 #include <net/xfrm.h>
49 #include <net/net_namespace.h>
50 #include <net/netns/generic.h>
51 #include <net/rtnetlink.h>
52
53 #include <net/ipv6.h>
54 #include <net/ip6_fib.h>
55 #include <net/ip6_route.h>
56 #include <net/ip6_tunnel.h>
57
58
59 static bool log_ecn_error = true;
60 module_param(log_ecn_error, bool, 0644);
61 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
62
63 #define HASH_SIZE_SHIFT 5
64 #define HASH_SIZE (1 << HASH_SIZE_SHIFT)
65
66 static int ip6gre_net_id __read_mostly;
67 struct ip6gre_net {
68 struct ip6_tnl __rcu *tunnels[4][HASH_SIZE];
69
70 struct net_device *fb_tunnel_dev;
71 };
72
73 static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
74 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
75 static int ip6gre_tunnel_init(struct net_device *dev);
76 static void ip6gre_tunnel_setup(struct net_device *dev);
77 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
78 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
79
80 /* Tunnel hash table */
81
82 /*
83 4 hash tables:
84
85 3: (remote,local)
86 2: (remote,*)
87 1: (*,local)
88 0: (*,*)
89
90 We require exact key match i.e. if a key is present in packet
91 it will match only tunnel with the same key; if it is not present,
92 it will match only keyless tunnel.
93
94 All keysless packets, if not matched configured keyless tunnels
95 will match fallback tunnel.
96 */
97
98 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(HASH_SIZE - 1))
99 static u32 HASH_ADDR(const struct in6_addr *addr)
100 {
101 u32 hash = ipv6_addr_hash(addr);
102
103 return hash_32(hash, HASH_SIZE_SHIFT);
104 }
105
106 #define tunnels_r_l tunnels[3]
107 #define tunnels_r tunnels[2]
108 #define tunnels_l tunnels[1]
109 #define tunnels_wc tunnels[0]
110
111 /* Given src, dst and key, find appropriate for input tunnel. */
112
113 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
114 const struct in6_addr *remote, const struct in6_addr *local,
115 __be32 key, __be16 gre_proto)
116 {
117 struct net *net = dev_net(dev);
118 int link = dev->ifindex;
119 unsigned int h0 = HASH_ADDR(remote);
120 unsigned int h1 = HASH_KEY(key);
121 struct ip6_tnl *t, *cand = NULL;
122 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
123 int dev_type = (gre_proto == htons(ETH_P_TEB)) ?
124 ARPHRD_ETHER : ARPHRD_IP6GRE;
125 int score, cand_score = 4;
126
127 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
128 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
129 !ipv6_addr_equal(remote, &t->parms.raddr) ||
130 key != t->parms.i_key ||
131 !(t->dev->flags & IFF_UP))
132 continue;
133
134 if (t->dev->type != ARPHRD_IP6GRE &&
135 t->dev->type != dev_type)
136 continue;
137
138 score = 0;
139 if (t->parms.link != link)
140 score |= 1;
141 if (t->dev->type != dev_type)
142 score |= 2;
143 if (score == 0)
144 return t;
145
146 if (score < cand_score) {
147 cand = t;
148 cand_score = score;
149 }
150 }
151
152 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
153 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
154 key != t->parms.i_key ||
155 !(t->dev->flags & IFF_UP))
156 continue;
157
158 if (t->dev->type != ARPHRD_IP6GRE &&
159 t->dev->type != dev_type)
160 continue;
161
162 score = 0;
163 if (t->parms.link != link)
164 score |= 1;
165 if (t->dev->type != dev_type)
166 score |= 2;
167 if (score == 0)
168 return t;
169
170 if (score < cand_score) {
171 cand = t;
172 cand_score = score;
173 }
174 }
175
176 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
177 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
178 (!ipv6_addr_equal(local, &t->parms.raddr) ||
179 !ipv6_addr_is_multicast(local))) ||
180 key != t->parms.i_key ||
181 !(t->dev->flags & IFF_UP))
182 continue;
183
184 if (t->dev->type != ARPHRD_IP6GRE &&
185 t->dev->type != dev_type)
186 continue;
187
188 score = 0;
189 if (t->parms.link != link)
190 score |= 1;
191 if (t->dev->type != dev_type)
192 score |= 2;
193 if (score == 0)
194 return t;
195
196 if (score < cand_score) {
197 cand = t;
198 cand_score = score;
199 }
200 }
201
202 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
203 if (t->parms.i_key != key ||
204 !(t->dev->flags & IFF_UP))
205 continue;
206
207 if (t->dev->type != ARPHRD_IP6GRE &&
208 t->dev->type != dev_type)
209 continue;
210
211 score = 0;
212 if (t->parms.link != link)
213 score |= 1;
214 if (t->dev->type != dev_type)
215 score |= 2;
216 if (score == 0)
217 return t;
218
219 if (score < cand_score) {
220 cand = t;
221 cand_score = score;
222 }
223 }
224
225 if (cand)
226 return cand;
227
228 dev = ign->fb_tunnel_dev;
229 if (dev->flags & IFF_UP)
230 return netdev_priv(dev);
231
232 return NULL;
233 }
234
235 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
236 const struct __ip6_tnl_parm *p)
237 {
238 const struct in6_addr *remote = &p->raddr;
239 const struct in6_addr *local = &p->laddr;
240 unsigned int h = HASH_KEY(p->i_key);
241 int prio = 0;
242
243 if (!ipv6_addr_any(local))
244 prio |= 1;
245 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
246 prio |= 2;
247 h ^= HASH_ADDR(remote);
248 }
249
250 return &ign->tunnels[prio][h];
251 }
252
253 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
254 const struct ip6_tnl *t)
255 {
256 return __ip6gre_bucket(ign, &t->parms);
257 }
258
259 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
260 {
261 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
262
263 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
264 rcu_assign_pointer(*tp, t);
265 }
266
267 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
268 {
269 struct ip6_tnl __rcu **tp;
270 struct ip6_tnl *iter;
271
272 for (tp = ip6gre_bucket(ign, t);
273 (iter = rtnl_dereference(*tp)) != NULL;
274 tp = &iter->next) {
275 if (t == iter) {
276 rcu_assign_pointer(*tp, t->next);
277 break;
278 }
279 }
280 }
281
282 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
283 const struct __ip6_tnl_parm *parms,
284 int type)
285 {
286 const struct in6_addr *remote = &parms->raddr;
287 const struct in6_addr *local = &parms->laddr;
288 __be32 key = parms->i_key;
289 int link = parms->link;
290 struct ip6_tnl *t;
291 struct ip6_tnl __rcu **tp;
292 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
293
294 for (tp = __ip6gre_bucket(ign, parms);
295 (t = rtnl_dereference(*tp)) != NULL;
296 tp = &t->next)
297 if (ipv6_addr_equal(local, &t->parms.laddr) &&
298 ipv6_addr_equal(remote, &t->parms.raddr) &&
299 key == t->parms.i_key &&
300 link == t->parms.link &&
301 type == t->dev->type)
302 break;
303
304 return t;
305 }
306
307 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
308 const struct __ip6_tnl_parm *parms, int create)
309 {
310 struct ip6_tnl *t, *nt;
311 struct net_device *dev;
312 char name[IFNAMSIZ];
313 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
314
315 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
316 if (t && create)
317 return NULL;
318 if (t || !create)
319 return t;
320
321 if (parms->name[0])
322 strlcpy(name, parms->name, IFNAMSIZ);
323 else
324 strcpy(name, "ip6gre%d");
325
326 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
327 ip6gre_tunnel_setup);
328 if (!dev)
329 return NULL;
330
331 dev_net_set(dev, net);
332
333 nt = netdev_priv(dev);
334 nt->parms = *parms;
335 dev->rtnl_link_ops = &ip6gre_link_ops;
336
337 nt->dev = dev;
338 nt->net = dev_net(dev);
339 ip6gre_tnl_link_config(nt, 1);
340
341 if (register_netdevice(dev) < 0)
342 goto failed_free;
343
344 /* Can use a lockless transmit, unless we generate output sequences */
345 if (!(nt->parms.o_flags & GRE_SEQ))
346 dev->features |= NETIF_F_LLTX;
347
348 dev_hold(dev);
349 ip6gre_tunnel_link(ign, nt);
350 return nt;
351
352 failed_free:
353 free_netdev(dev);
354 return NULL;
355 }
356
357 static void ip6gre_tunnel_uninit(struct net_device *dev)
358 {
359 struct ip6_tnl *t = netdev_priv(dev);
360 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
361
362 ip6gre_tunnel_unlink(ign, t);
363 dst_cache_reset(&t->dst_cache);
364 dev_put(dev);
365 }
366
367
368 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
369 u8 type, u8 code, int offset, __be32 info)
370 {
371 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
372 __be16 *p = (__be16 *)(skb->data + offset);
373 int grehlen = offset + 4;
374 struct ip6_tnl *t;
375 __be16 flags;
376
377 flags = p[0];
378 if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) {
379 if (flags&(GRE_VERSION|GRE_ROUTING))
380 return;
381 if (flags&GRE_KEY) {
382 grehlen += 4;
383 if (flags&GRE_CSUM)
384 grehlen += 4;
385 }
386 }
387
388 /* If only 8 bytes returned, keyed message will be dropped here */
389 if (!pskb_may_pull(skb, grehlen))
390 return;
391 ipv6h = (const struct ipv6hdr *)skb->data;
392 p = (__be16 *)(skb->data + offset);
393
394 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
395 flags & GRE_KEY ?
396 *(((__be32 *)p) + (grehlen / 4) - 1) : 0,
397 p[1]);
398 if (!t)
399 return;
400
401 switch (type) {
402 __u32 teli;
403 struct ipv6_tlv_tnl_enc_lim *tel;
404 __u32 mtu;
405 case ICMPV6_DEST_UNREACH:
406 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
407 t->parms.name);
408 break;
409 case ICMPV6_TIME_EXCEED:
410 if (code == ICMPV6_EXC_HOPLIMIT) {
411 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
412 t->parms.name);
413 }
414 break;
415 case ICMPV6_PARAMPROB:
416 teli = 0;
417 if (code == ICMPV6_HDR_FIELD)
418 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
419
420 if (teli && teli == be32_to_cpu(info) - 2) {
421 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
422 if (tel->encap_limit == 0) {
423 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
424 t->parms.name);
425 }
426 } else {
427 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
428 t->parms.name);
429 }
430 break;
431 case ICMPV6_PKT_TOOBIG:
432 mtu = be32_to_cpu(info) - offset;
433 if (mtu < IPV6_MIN_MTU)
434 mtu = IPV6_MIN_MTU;
435 t->dev->mtu = mtu;
436 break;
437 }
438
439 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
440 t->err_count++;
441 else
442 t->err_count = 1;
443 t->err_time = jiffies;
444 }
445
446 static int ip6gre_rcv(struct sk_buff *skb)
447 {
448 const struct ipv6hdr *ipv6h;
449 u8 *h;
450 __be16 flags;
451 __sum16 csum = 0;
452 __be32 key = 0;
453 u32 seqno = 0;
454 struct ip6_tnl *tunnel;
455 int offset = 4;
456 __be16 gre_proto;
457 int err;
458
459 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
460 goto drop;
461
462 ipv6h = ipv6_hdr(skb);
463 h = skb->data;
464 flags = *(__be16 *)h;
465
466 if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) {
467 /* - Version must be 0.
468 - We do not support routing headers.
469 */
470 if (flags&(GRE_VERSION|GRE_ROUTING))
471 goto drop;
472
473 if (flags&GRE_CSUM) {
474 csum = skb_checksum_simple_validate(skb);
475 offset += 4;
476 }
477 if (flags&GRE_KEY) {
478 key = *(__be32 *)(h + offset);
479 offset += 4;
480 }
481 if (flags&GRE_SEQ) {
482 seqno = ntohl(*(__be32 *)(h + offset));
483 offset += 4;
484 }
485 }
486
487 gre_proto = *(__be16 *)(h + 2);
488
489 tunnel = ip6gre_tunnel_lookup(skb->dev,
490 &ipv6h->saddr, &ipv6h->daddr, key,
491 gre_proto);
492 if (tunnel) {
493 struct pcpu_sw_netstats *tstats;
494
495 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
496 goto drop;
497
498 if (!ip6_tnl_rcv_ctl(tunnel, &ipv6h->daddr, &ipv6h->saddr)) {
499 tunnel->dev->stats.rx_dropped++;
500 goto drop;
501 }
502
503 skb->protocol = gre_proto;
504 /* WCCP version 1 and 2 protocol decoding.
505 * - Change protocol to IPv6
506 * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
507 */
508 if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) {
509 skb->protocol = htons(ETH_P_IPV6);
510 if ((*(h + offset) & 0xF0) != 0x40)
511 offset += 4;
512 }
513
514 skb->mac_header = skb->network_header;
515 __pskb_pull(skb, offset);
516 skb_postpull_rcsum(skb, skb_transport_header(skb), offset);
517
518 if (((flags&GRE_CSUM) && csum) ||
519 (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) {
520 tunnel->dev->stats.rx_crc_errors++;
521 tunnel->dev->stats.rx_errors++;
522 goto drop;
523 }
524 if (tunnel->parms.i_flags&GRE_SEQ) {
525 if (!(flags&GRE_SEQ) ||
526 (tunnel->i_seqno &&
527 (s32)(seqno - tunnel->i_seqno) < 0)) {
528 tunnel->dev->stats.rx_fifo_errors++;
529 tunnel->dev->stats.rx_errors++;
530 goto drop;
531 }
532 tunnel->i_seqno = seqno + 1;
533 }
534
535 /* Warning: All skb pointers will be invalidated! */
536 if (tunnel->dev->type == ARPHRD_ETHER) {
537 if (!pskb_may_pull(skb, ETH_HLEN)) {
538 tunnel->dev->stats.rx_length_errors++;
539 tunnel->dev->stats.rx_errors++;
540 goto drop;
541 }
542
543 ipv6h = ipv6_hdr(skb);
544 skb->protocol = eth_type_trans(skb, tunnel->dev);
545 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
546 }
547
548 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
549
550 skb_reset_network_header(skb);
551
552 err = IP6_ECN_decapsulate(ipv6h, skb);
553 if (unlikely(err)) {
554 if (log_ecn_error)
555 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
556 &ipv6h->saddr,
557 ipv6_get_dsfield(ipv6h));
558 if (err > 1) {
559 ++tunnel->dev->stats.rx_frame_errors;
560 ++tunnel->dev->stats.rx_errors;
561 goto drop;
562 }
563 }
564
565 tstats = this_cpu_ptr(tunnel->dev->tstats);
566 u64_stats_update_begin(&tstats->syncp);
567 tstats->rx_packets++;
568 tstats->rx_bytes += skb->len;
569 u64_stats_update_end(&tstats->syncp);
570
571 netif_rx(skb);
572
573 return 0;
574 }
575 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
576
577 drop:
578 kfree_skb(skb);
579 return 0;
580 }
581
582 struct ipv6_tel_txoption {
583 struct ipv6_txoptions ops;
584 __u8 dst_opt[8];
585 };
586
587 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
588 {
589 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
590
591 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
592 opt->dst_opt[3] = 1;
593 opt->dst_opt[4] = encap_limit;
594 opt->dst_opt[5] = IPV6_TLV_PADN;
595 opt->dst_opt[6] = 1;
596
597 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
598 opt->ops.opt_nflen = 8;
599 }
600
601 static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
602 struct net_device *dev,
603 __u8 dsfield,
604 struct flowi6 *fl6,
605 int encap_limit,
606 __u32 *pmtu)
607 {
608 struct ip6_tnl *tunnel = netdev_priv(dev);
609 struct net *net = tunnel->net;
610 struct net_device *tdev; /* Device to other host */
611 struct ipv6hdr *ipv6h; /* Our new IP header */
612 unsigned int max_headroom = 0; /* The extra header space needed */
613 int gre_hlen;
614 struct ipv6_tel_txoption opt;
615 int mtu;
616 struct dst_entry *dst = NULL, *ndst = NULL;
617 struct net_device_stats *stats = &tunnel->dev->stats;
618 int err = -1;
619 u8 proto;
620 struct sk_buff *new_skb;
621 __be16 protocol;
622
623 if (dev->type == ARPHRD_ETHER)
624 IPCB(skb)->flags = 0;
625
626 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) {
627 gre_hlen = 0;
628 ipv6h = (struct ipv6hdr *)skb->data;
629 fl6->daddr = ipv6h->daddr;
630 } else {
631 gre_hlen = tunnel->hlen;
632 fl6->daddr = tunnel->parms.raddr;
633 }
634
635 if (!fl6->flowi6_mark)
636 dst = dst_cache_get(&tunnel->dst_cache);
637
638 if (!dst) {
639 dst = ip6_route_output(net, NULL, fl6);
640
641 if (dst->error)
642 goto tx_err_link_failure;
643 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
644 if (IS_ERR(dst)) {
645 err = PTR_ERR(dst);
646 dst = NULL;
647 goto tx_err_link_failure;
648 }
649 ndst = dst;
650 }
651
652 tdev = dst->dev;
653
654 if (tdev == dev) {
655 stats->collisions++;
656 net_warn_ratelimited("%s: Local routing loop detected!\n",
657 tunnel->parms.name);
658 goto tx_err_dst_release;
659 }
660
661 mtu = dst_mtu(dst) - sizeof(*ipv6h);
662 if (encap_limit >= 0) {
663 max_headroom += 8;
664 mtu -= 8;
665 }
666 if (mtu < IPV6_MIN_MTU)
667 mtu = IPV6_MIN_MTU;
668 if (skb_dst(skb))
669 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
670 if (skb->len > mtu) {
671 *pmtu = mtu;
672 err = -EMSGSIZE;
673 goto tx_err_dst_release;
674 }
675
676 if (tunnel->err_count > 0) {
677 if (time_before(jiffies,
678 tunnel->err_time + IP6TUNNEL_ERR_TIMEO)) {
679 tunnel->err_count--;
680
681 dst_link_failure(skb);
682 } else
683 tunnel->err_count = 0;
684 }
685
686 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
687
688 max_headroom += LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len;
689
690 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
691 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
692 new_skb = skb_realloc_headroom(skb, max_headroom);
693 if (max_headroom > dev->needed_headroom)
694 dev->needed_headroom = max_headroom;
695 if (!new_skb)
696 goto tx_err_dst_release;
697
698 if (skb->sk)
699 skb_set_owner_w(new_skb, skb->sk);
700 consume_skb(skb);
701 skb = new_skb;
702 }
703
704 if (!fl6->flowi6_mark && ndst)
705 dst_cache_set_ip6(&tunnel->dst_cache, ndst, &fl6->saddr);
706 skb_dst_set(skb, dst);
707
708 proto = NEXTHDR_GRE;
709 if (encap_limit >= 0) {
710 init_tel_txopt(&opt, encap_limit);
711 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
712 }
713
714 if (likely(!skb->encapsulation)) {
715 skb_reset_inner_headers(skb);
716 skb->encapsulation = 1;
717 }
718
719 skb_push(skb, gre_hlen);
720 skb_reset_network_header(skb);
721 skb_set_transport_header(skb, sizeof(*ipv6h));
722
723 /*
724 * Push down and install the IP header.
725 */
726 ipv6h = ipv6_hdr(skb);
727 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield),
728 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6));
729 ipv6h->hop_limit = tunnel->parms.hop_limit;
730 ipv6h->nexthdr = proto;
731 ipv6h->saddr = fl6->saddr;
732 ipv6h->daddr = fl6->daddr;
733
734 ((__be16 *)(ipv6h + 1))[0] = tunnel->parms.o_flags;
735 protocol = (dev->type == ARPHRD_ETHER) ?
736 htons(ETH_P_TEB) : skb->protocol;
737 ((__be16 *)(ipv6h + 1))[1] = protocol;
738
739 if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) {
740 __be32 *ptr = (__be32 *)(((u8 *)ipv6h) + tunnel->hlen - 4);
741
742 if (tunnel->parms.o_flags&GRE_SEQ) {
743 ++tunnel->o_seqno;
744 *ptr = htonl(tunnel->o_seqno);
745 ptr--;
746 }
747 if (tunnel->parms.o_flags&GRE_KEY) {
748 *ptr = tunnel->parms.o_key;
749 ptr--;
750 }
751 if (tunnel->parms.o_flags&GRE_CSUM) {
752 *ptr = 0;
753 *(__sum16 *)ptr = ip_compute_csum((void *)(ipv6h+1),
754 skb->len - sizeof(struct ipv6hdr));
755 }
756 }
757
758 skb_set_inner_protocol(skb, protocol);
759
760 ip6tunnel_xmit(NULL, skb, dev);
761 return 0;
762 tx_err_link_failure:
763 stats->tx_carrier_errors++;
764 dst_link_failure(skb);
765 tx_err_dst_release:
766 dst_release(dst);
767 return err;
768 }
769
770 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
771 {
772 struct ip6_tnl *t = netdev_priv(dev);
773 const struct iphdr *iph = ip_hdr(skb);
774 int encap_limit = -1;
775 struct flowi6 fl6;
776 __u8 dsfield;
777 __u32 mtu;
778 int err;
779
780 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
781
782 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
783 encap_limit = t->parms.encap_limit;
784
785 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
786 fl6.flowi6_proto = IPPROTO_GRE;
787
788 dsfield = ipv4_get_dsfield(iph);
789
790 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
791 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
792 & IPV6_TCLASS_MASK;
793 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
794 fl6.flowi6_mark = skb->mark;
795
796 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
797 if (err != 0) {
798 /* XXX: send ICMP error even if DF is not set. */
799 if (err == -EMSGSIZE)
800 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
801 htonl(mtu));
802 return -1;
803 }
804
805 return 0;
806 }
807
808 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
809 {
810 struct ip6_tnl *t = netdev_priv(dev);
811 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
812 int encap_limit = -1;
813 __u16 offset;
814 struct flowi6 fl6;
815 __u8 dsfield;
816 __u32 mtu;
817 int err;
818
819 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
820 return -1;
821
822 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
823 if (offset > 0) {
824 struct ipv6_tlv_tnl_enc_lim *tel;
825 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
826 if (tel->encap_limit == 0) {
827 icmpv6_send(skb, ICMPV6_PARAMPROB,
828 ICMPV6_HDR_FIELD, offset + 2);
829 return -1;
830 }
831 encap_limit = tel->encap_limit - 1;
832 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
833 encap_limit = t->parms.encap_limit;
834
835 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
836 fl6.flowi6_proto = IPPROTO_GRE;
837
838 dsfield = ipv6_get_dsfield(ipv6h);
839 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
840 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
841 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
842 fl6.flowlabel |= ip6_flowlabel(ipv6h);
843 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
844 fl6.flowi6_mark = skb->mark;
845
846 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
847 if (err != 0) {
848 if (err == -EMSGSIZE)
849 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
850 return -1;
851 }
852
853 return 0;
854 }
855
856 /**
857 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
858 * @t: the outgoing tunnel device
859 * @hdr: IPv6 header from the incoming packet
860 *
861 * Description:
862 * Avoid trivial tunneling loop by checking that tunnel exit-point
863 * doesn't match source of incoming packet.
864 *
865 * Return:
866 * 1 if conflict,
867 * 0 else
868 **/
869
870 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
871 const struct ipv6hdr *hdr)
872 {
873 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
874 }
875
876 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
877 {
878 struct ip6_tnl *t = netdev_priv(dev);
879 int encap_limit = -1;
880 struct flowi6 fl6;
881 __u32 mtu;
882 int err;
883
884 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
885 encap_limit = t->parms.encap_limit;
886
887 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
888 fl6.flowi6_proto = skb->protocol;
889
890 err = ip6gre_xmit2(skb, dev, 0, &fl6, encap_limit, &mtu);
891
892 return err;
893 }
894
895 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
896 struct net_device *dev)
897 {
898 struct ip6_tnl *t = netdev_priv(dev);
899 struct net_device_stats *stats = &t->dev->stats;
900 int ret;
901
902 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
903 goto tx_err;
904
905 switch (skb->protocol) {
906 case htons(ETH_P_IP):
907 ret = ip6gre_xmit_ipv4(skb, dev);
908 break;
909 case htons(ETH_P_IPV6):
910 ret = ip6gre_xmit_ipv6(skb, dev);
911 break;
912 default:
913 ret = ip6gre_xmit_other(skb, dev);
914 break;
915 }
916
917 if (ret < 0)
918 goto tx_err;
919
920 return NETDEV_TX_OK;
921
922 tx_err:
923 stats->tx_errors++;
924 stats->tx_dropped++;
925 kfree_skb(skb);
926 return NETDEV_TX_OK;
927 }
928
929 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
930 {
931 struct net_device *dev = t->dev;
932 struct __ip6_tnl_parm *p = &t->parms;
933 struct flowi6 *fl6 = &t->fl.u.ip6;
934 int addend = sizeof(struct ipv6hdr) + 4;
935
936 if (dev->type != ARPHRD_ETHER) {
937 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
938 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
939 }
940
941 /* Set up flowi template */
942 fl6->saddr = p->laddr;
943 fl6->daddr = p->raddr;
944 fl6->flowi6_oif = p->link;
945 fl6->flowlabel = 0;
946
947 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
948 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
949 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
950 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
951
952 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
953 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
954
955 if (p->flags&IP6_TNL_F_CAP_XMIT &&
956 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
957 dev->flags |= IFF_POINTOPOINT;
958 else
959 dev->flags &= ~IFF_POINTOPOINT;
960
961 /* Precalculate GRE options length */
962 if (t->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) {
963 if (t->parms.o_flags&GRE_CSUM)
964 addend += 4;
965 if (t->parms.o_flags&GRE_KEY)
966 addend += 4;
967 if (t->parms.o_flags&GRE_SEQ)
968 addend += 4;
969 }
970 t->hlen = addend;
971
972 if (p->flags & IP6_TNL_F_CAP_XMIT) {
973 int strict = (ipv6_addr_type(&p->raddr) &
974 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
975
976 struct rt6_info *rt = rt6_lookup(t->net,
977 &p->raddr, &p->laddr,
978 p->link, strict);
979
980 if (!rt)
981 return;
982
983 if (rt->dst.dev) {
984 dev->hard_header_len = rt->dst.dev->hard_header_len + addend;
985
986 if (set_mtu) {
987 dev->mtu = rt->dst.dev->mtu - addend;
988 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
989 dev->mtu -= 8;
990
991 if (dev->mtu < IPV6_MIN_MTU)
992 dev->mtu = IPV6_MIN_MTU;
993 }
994 }
995 ip6_rt_put(rt);
996 }
997 }
998
999 static int ip6gre_tnl_change(struct ip6_tnl *t,
1000 const struct __ip6_tnl_parm *p, int set_mtu)
1001 {
1002 t->parms.laddr = p->laddr;
1003 t->parms.raddr = p->raddr;
1004 t->parms.flags = p->flags;
1005 t->parms.hop_limit = p->hop_limit;
1006 t->parms.encap_limit = p->encap_limit;
1007 t->parms.flowinfo = p->flowinfo;
1008 t->parms.link = p->link;
1009 t->parms.proto = p->proto;
1010 t->parms.i_key = p->i_key;
1011 t->parms.o_key = p->o_key;
1012 t->parms.i_flags = p->i_flags;
1013 t->parms.o_flags = p->o_flags;
1014 dst_cache_reset(&t->dst_cache);
1015 ip6gre_tnl_link_config(t, set_mtu);
1016 return 0;
1017 }
1018
1019 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1020 const struct ip6_tnl_parm2 *u)
1021 {
1022 p->laddr = u->laddr;
1023 p->raddr = u->raddr;
1024 p->flags = u->flags;
1025 p->hop_limit = u->hop_limit;
1026 p->encap_limit = u->encap_limit;
1027 p->flowinfo = u->flowinfo;
1028 p->link = u->link;
1029 p->i_key = u->i_key;
1030 p->o_key = u->o_key;
1031 p->i_flags = u->i_flags;
1032 p->o_flags = u->o_flags;
1033 memcpy(p->name, u->name, sizeof(u->name));
1034 }
1035
1036 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1037 const struct __ip6_tnl_parm *p)
1038 {
1039 u->proto = IPPROTO_GRE;
1040 u->laddr = p->laddr;
1041 u->raddr = p->raddr;
1042 u->flags = p->flags;
1043 u->hop_limit = p->hop_limit;
1044 u->encap_limit = p->encap_limit;
1045 u->flowinfo = p->flowinfo;
1046 u->link = p->link;
1047 u->i_key = p->i_key;
1048 u->o_key = p->o_key;
1049 u->i_flags = p->i_flags;
1050 u->o_flags = p->o_flags;
1051 memcpy(u->name, p->name, sizeof(u->name));
1052 }
1053
1054 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1055 struct ifreq *ifr, int cmd)
1056 {
1057 int err = 0;
1058 struct ip6_tnl_parm2 p;
1059 struct __ip6_tnl_parm p1;
1060 struct ip6_tnl *t = netdev_priv(dev);
1061 struct net *net = t->net;
1062 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1063
1064 switch (cmd) {
1065 case SIOCGETTUNNEL:
1066 if (dev == ign->fb_tunnel_dev) {
1067 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1068 err = -EFAULT;
1069 break;
1070 }
1071 ip6gre_tnl_parm_from_user(&p1, &p);
1072 t = ip6gre_tunnel_locate(net, &p1, 0);
1073 if (!t)
1074 t = netdev_priv(dev);
1075 }
1076 memset(&p, 0, sizeof(p));
1077 ip6gre_tnl_parm_to_user(&p, &t->parms);
1078 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1079 err = -EFAULT;
1080 break;
1081
1082 case SIOCADDTUNNEL:
1083 case SIOCCHGTUNNEL:
1084 err = -EPERM;
1085 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1086 goto done;
1087
1088 err = -EFAULT;
1089 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1090 goto done;
1091
1092 err = -EINVAL;
1093 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1094 goto done;
1095
1096 if (!(p.i_flags&GRE_KEY))
1097 p.i_key = 0;
1098 if (!(p.o_flags&GRE_KEY))
1099 p.o_key = 0;
1100
1101 ip6gre_tnl_parm_from_user(&p1, &p);
1102 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1103
1104 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1105 if (t) {
1106 if (t->dev != dev) {
1107 err = -EEXIST;
1108 break;
1109 }
1110 } else {
1111 t = netdev_priv(dev);
1112
1113 ip6gre_tunnel_unlink(ign, t);
1114 synchronize_net();
1115 ip6gre_tnl_change(t, &p1, 1);
1116 ip6gre_tunnel_link(ign, t);
1117 netdev_state_change(dev);
1118 }
1119 }
1120
1121 if (t) {
1122 err = 0;
1123
1124 memset(&p, 0, sizeof(p));
1125 ip6gre_tnl_parm_to_user(&p, &t->parms);
1126 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1127 err = -EFAULT;
1128 } else
1129 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1130 break;
1131
1132 case SIOCDELTUNNEL:
1133 err = -EPERM;
1134 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1135 goto done;
1136
1137 if (dev == ign->fb_tunnel_dev) {
1138 err = -EFAULT;
1139 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1140 goto done;
1141 err = -ENOENT;
1142 ip6gre_tnl_parm_from_user(&p1, &p);
1143 t = ip6gre_tunnel_locate(net, &p1, 0);
1144 if (!t)
1145 goto done;
1146 err = -EPERM;
1147 if (t == netdev_priv(ign->fb_tunnel_dev))
1148 goto done;
1149 dev = t->dev;
1150 }
1151 unregister_netdevice(dev);
1152 err = 0;
1153 break;
1154
1155 default:
1156 err = -EINVAL;
1157 }
1158
1159 done:
1160 return err;
1161 }
1162
1163 static int ip6gre_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1164 {
1165 if (new_mtu < 68 ||
1166 new_mtu > 0xFFF8 - dev->hard_header_len)
1167 return -EINVAL;
1168 dev->mtu = new_mtu;
1169 return 0;
1170 }
1171
1172 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1173 unsigned short type,
1174 const void *daddr, const void *saddr, unsigned int len)
1175 {
1176 struct ip6_tnl *t = netdev_priv(dev);
1177 struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen);
1178 __be16 *p = (__be16 *)(ipv6h+1);
1179
1180 ip6_flow_hdr(ipv6h, 0,
1181 ip6_make_flowlabel(dev_net(dev), skb,
1182 t->fl.u.ip6.flowlabel, true,
1183 &t->fl.u.ip6));
1184 ipv6h->hop_limit = t->parms.hop_limit;
1185 ipv6h->nexthdr = NEXTHDR_GRE;
1186 ipv6h->saddr = t->parms.laddr;
1187 ipv6h->daddr = t->parms.raddr;
1188
1189 p[0] = t->parms.o_flags;
1190 p[1] = htons(type);
1191
1192 /*
1193 * Set the source hardware address.
1194 */
1195
1196 if (saddr)
1197 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1198 if (daddr)
1199 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1200 if (!ipv6_addr_any(&ipv6h->daddr))
1201 return t->hlen;
1202
1203 return -t->hlen;
1204 }
1205
1206 static const struct header_ops ip6gre_header_ops = {
1207 .create = ip6gre_header,
1208 };
1209
1210 static const struct net_device_ops ip6gre_netdev_ops = {
1211 .ndo_init = ip6gre_tunnel_init,
1212 .ndo_uninit = ip6gre_tunnel_uninit,
1213 .ndo_start_xmit = ip6gre_tunnel_xmit,
1214 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1215 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1216 .ndo_get_stats64 = ip_tunnel_get_stats64,
1217 .ndo_get_iflink = ip6_tnl_get_iflink,
1218 };
1219
1220 static void ip6gre_dev_free(struct net_device *dev)
1221 {
1222 struct ip6_tnl *t = netdev_priv(dev);
1223
1224 dst_cache_destroy(&t->dst_cache);
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_common(struct net_device *dev)
1248 {
1249 struct ip6_tnl *tunnel;
1250 int ret;
1251
1252 tunnel = netdev_priv(dev);
1253
1254 tunnel->dev = dev;
1255 tunnel->net = dev_net(dev);
1256 strcpy(tunnel->parms.name, dev->name);
1257
1258 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1259 if (!dev->tstats)
1260 return -ENOMEM;
1261
1262 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1263 if (ret) {
1264 free_percpu(dev->tstats);
1265 dev->tstats = NULL;
1266 return ret;
1267 }
1268
1269 return 0;
1270 }
1271
1272 static int ip6gre_tunnel_init(struct net_device *dev)
1273 {
1274 struct ip6_tnl *tunnel;
1275 int ret;
1276
1277 ret = ip6gre_tunnel_init_common(dev);
1278 if (ret)
1279 return ret;
1280
1281 tunnel = netdev_priv(dev);
1282
1283 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1284 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1285
1286 if (ipv6_addr_any(&tunnel->parms.raddr))
1287 dev->header_ops = &ip6gre_header_ops;
1288
1289 return 0;
1290 }
1291
1292 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1293 {
1294 struct ip6_tnl *tunnel = netdev_priv(dev);
1295
1296 tunnel->dev = dev;
1297 tunnel->net = dev_net(dev);
1298 strcpy(tunnel->parms.name, dev->name);
1299
1300 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1301
1302 dev_hold(dev);
1303 }
1304
1305
1306 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1307 .handler = ip6gre_rcv,
1308 .err_handler = ip6gre_err,
1309 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1310 };
1311
1312 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1313 {
1314 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1315 struct net_device *dev, *aux;
1316 int prio;
1317
1318 for_each_netdev_safe(net, dev, aux)
1319 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1320 dev->rtnl_link_ops == &ip6gre_tap_ops)
1321 unregister_netdevice_queue(dev, head);
1322
1323 for (prio = 0; prio < 4; prio++) {
1324 int h;
1325 for (h = 0; h < HASH_SIZE; h++) {
1326 struct ip6_tnl *t;
1327
1328 t = rtnl_dereference(ign->tunnels[prio][h]);
1329
1330 while (t) {
1331 /* If dev is in the same netns, it has already
1332 * been added to the list by the previous loop.
1333 */
1334 if (!net_eq(dev_net(t->dev), net))
1335 unregister_netdevice_queue(t->dev,
1336 head);
1337 t = rtnl_dereference(t->next);
1338 }
1339 }
1340 }
1341 }
1342
1343 static int __net_init ip6gre_init_net(struct net *net)
1344 {
1345 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1346 int err;
1347
1348 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1349 NET_NAME_UNKNOWN,
1350 ip6gre_tunnel_setup);
1351 if (!ign->fb_tunnel_dev) {
1352 err = -ENOMEM;
1353 goto err_alloc_dev;
1354 }
1355 dev_net_set(ign->fb_tunnel_dev, net);
1356 /* FB netdevice is special: we have one, and only one per netns.
1357 * Allowing to move it to another netns is clearly unsafe.
1358 */
1359 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1360
1361
1362 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1363 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1364
1365 err = register_netdev(ign->fb_tunnel_dev);
1366 if (err)
1367 goto err_reg_dev;
1368
1369 rcu_assign_pointer(ign->tunnels_wc[0],
1370 netdev_priv(ign->fb_tunnel_dev));
1371 return 0;
1372
1373 err_reg_dev:
1374 ip6gre_dev_free(ign->fb_tunnel_dev);
1375 err_alloc_dev:
1376 return err;
1377 }
1378
1379 static void __net_exit ip6gre_exit_net(struct net *net)
1380 {
1381 LIST_HEAD(list);
1382
1383 rtnl_lock();
1384 ip6gre_destroy_tunnels(net, &list);
1385 unregister_netdevice_many(&list);
1386 rtnl_unlock();
1387 }
1388
1389 static struct pernet_operations ip6gre_net_ops = {
1390 .init = ip6gre_init_net,
1391 .exit = ip6gre_exit_net,
1392 .id = &ip6gre_net_id,
1393 .size = sizeof(struct ip6gre_net),
1394 };
1395
1396 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
1397 {
1398 __be16 flags;
1399
1400 if (!data)
1401 return 0;
1402
1403 flags = 0;
1404 if (data[IFLA_GRE_IFLAGS])
1405 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1406 if (data[IFLA_GRE_OFLAGS])
1407 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1408 if (flags & (GRE_VERSION|GRE_ROUTING))
1409 return -EINVAL;
1410
1411 return 0;
1412 }
1413
1414 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
1415 {
1416 struct in6_addr daddr;
1417
1418 if (tb[IFLA_ADDRESS]) {
1419 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1420 return -EINVAL;
1421 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1422 return -EADDRNOTAVAIL;
1423 }
1424
1425 if (!data)
1426 goto out;
1427
1428 if (data[IFLA_GRE_REMOTE]) {
1429 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1430 if (ipv6_addr_any(&daddr))
1431 return -EINVAL;
1432 }
1433
1434 out:
1435 return ip6gre_tunnel_validate(tb, data);
1436 }
1437
1438
1439 static void ip6gre_netlink_parms(struct nlattr *data[],
1440 struct __ip6_tnl_parm *parms)
1441 {
1442 memset(parms, 0, sizeof(*parms));
1443
1444 if (!data)
1445 return;
1446
1447 if (data[IFLA_GRE_LINK])
1448 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1449
1450 if (data[IFLA_GRE_IFLAGS])
1451 parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]);
1452
1453 if (data[IFLA_GRE_OFLAGS])
1454 parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]);
1455
1456 if (data[IFLA_GRE_IKEY])
1457 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1458
1459 if (data[IFLA_GRE_OKEY])
1460 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1461
1462 if (data[IFLA_GRE_LOCAL])
1463 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1464
1465 if (data[IFLA_GRE_REMOTE])
1466 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1467
1468 if (data[IFLA_GRE_TTL])
1469 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1470
1471 if (data[IFLA_GRE_ENCAP_LIMIT])
1472 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1473
1474 if (data[IFLA_GRE_FLOWINFO])
1475 parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]);
1476
1477 if (data[IFLA_GRE_FLAGS])
1478 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1479 }
1480
1481 static int ip6gre_tap_init(struct net_device *dev)
1482 {
1483 struct ip6_tnl *tunnel;
1484 int ret;
1485
1486 ret = ip6gre_tunnel_init_common(dev);
1487 if (ret)
1488 return ret;
1489
1490 tunnel = netdev_priv(dev);
1491
1492 ip6gre_tnl_link_config(tunnel, 1);
1493
1494 return 0;
1495 }
1496
1497 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1498 .ndo_init = ip6gre_tap_init,
1499 .ndo_uninit = ip6gre_tunnel_uninit,
1500 .ndo_start_xmit = ip6gre_tunnel_xmit,
1501 .ndo_set_mac_address = eth_mac_addr,
1502 .ndo_validate_addr = eth_validate_addr,
1503 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1504 .ndo_get_stats64 = ip_tunnel_get_stats64,
1505 .ndo_get_iflink = ip6_tnl_get_iflink,
1506 };
1507
1508 static void ip6gre_tap_setup(struct net_device *dev)
1509 {
1510
1511 ether_setup(dev);
1512
1513 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1514 dev->destructor = ip6gre_dev_free;
1515
1516 dev->features |= NETIF_F_NETNS_LOCAL;
1517 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1518 }
1519
1520 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1521 struct nlattr *tb[], struct nlattr *data[])
1522 {
1523 struct ip6_tnl *nt;
1524 struct net *net = dev_net(dev);
1525 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1526 int err;
1527
1528 nt = netdev_priv(dev);
1529 ip6gre_netlink_parms(data, &nt->parms);
1530
1531 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1532 return -EEXIST;
1533
1534 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1535 eth_hw_addr_random(dev);
1536
1537 nt->dev = dev;
1538 nt->net = dev_net(dev);
1539 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1540
1541 /* Can use a lockless transmit, unless we generate output sequences */
1542 if (!(nt->parms.o_flags & GRE_SEQ))
1543 dev->features |= NETIF_F_LLTX;
1544
1545 err = register_netdevice(dev);
1546 if (err)
1547 goto out;
1548
1549 dev_hold(dev);
1550 ip6gre_tunnel_link(ign, nt);
1551
1552 out:
1553 return err;
1554 }
1555
1556 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1557 struct nlattr *data[])
1558 {
1559 struct ip6_tnl *t, *nt = netdev_priv(dev);
1560 struct net *net = nt->net;
1561 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1562 struct __ip6_tnl_parm p;
1563
1564 if (dev == ign->fb_tunnel_dev)
1565 return -EINVAL;
1566
1567 ip6gre_netlink_parms(data, &p);
1568
1569 t = ip6gre_tunnel_locate(net, &p, 0);
1570
1571 if (t) {
1572 if (t->dev != dev)
1573 return -EEXIST;
1574 } else {
1575 t = nt;
1576 }
1577
1578 ip6gre_tunnel_unlink(ign, t);
1579 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1580 ip6gre_tunnel_link(ign, t);
1581 return 0;
1582 }
1583
1584 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
1585 {
1586 struct net *net = dev_net(dev);
1587 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1588
1589 if (dev != ign->fb_tunnel_dev)
1590 unregister_netdevice_queue(dev, head);
1591 }
1592
1593 static size_t ip6gre_get_size(const struct net_device *dev)
1594 {
1595 return
1596 /* IFLA_GRE_LINK */
1597 nla_total_size(4) +
1598 /* IFLA_GRE_IFLAGS */
1599 nla_total_size(2) +
1600 /* IFLA_GRE_OFLAGS */
1601 nla_total_size(2) +
1602 /* IFLA_GRE_IKEY */
1603 nla_total_size(4) +
1604 /* IFLA_GRE_OKEY */
1605 nla_total_size(4) +
1606 /* IFLA_GRE_LOCAL */
1607 nla_total_size(sizeof(struct in6_addr)) +
1608 /* IFLA_GRE_REMOTE */
1609 nla_total_size(sizeof(struct in6_addr)) +
1610 /* IFLA_GRE_TTL */
1611 nla_total_size(1) +
1612 /* IFLA_GRE_TOS */
1613 nla_total_size(1) +
1614 /* IFLA_GRE_ENCAP_LIMIT */
1615 nla_total_size(1) +
1616 /* IFLA_GRE_FLOWINFO */
1617 nla_total_size(4) +
1618 /* IFLA_GRE_FLAGS */
1619 nla_total_size(4) +
1620 0;
1621 }
1622
1623 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1624 {
1625 struct ip6_tnl *t = netdev_priv(dev);
1626 struct __ip6_tnl_parm *p = &t->parms;
1627
1628 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1629 nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) ||
1630 nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) ||
1631 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1632 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
1633 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
1634 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
1635 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1636 /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/
1637 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1638 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1639 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags))
1640 goto nla_put_failure;
1641 return 0;
1642
1643 nla_put_failure:
1644 return -EMSGSIZE;
1645 }
1646
1647 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1648 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1649 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1650 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1651 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1652 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1653 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1654 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1655 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1656 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1657 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1658 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1659 };
1660
1661 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1662 .kind = "ip6gre",
1663 .maxtype = IFLA_GRE_MAX,
1664 .policy = ip6gre_policy,
1665 .priv_size = sizeof(struct ip6_tnl),
1666 .setup = ip6gre_tunnel_setup,
1667 .validate = ip6gre_tunnel_validate,
1668 .newlink = ip6gre_newlink,
1669 .changelink = ip6gre_changelink,
1670 .dellink = ip6gre_dellink,
1671 .get_size = ip6gre_get_size,
1672 .fill_info = ip6gre_fill_info,
1673 .get_link_net = ip6_tnl_get_link_net,
1674 };
1675
1676 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1677 .kind = "ip6gretap",
1678 .maxtype = IFLA_GRE_MAX,
1679 .policy = ip6gre_policy,
1680 .priv_size = sizeof(struct ip6_tnl),
1681 .setup = ip6gre_tap_setup,
1682 .validate = ip6gre_tap_validate,
1683 .newlink = ip6gre_newlink,
1684 .changelink = ip6gre_changelink,
1685 .get_size = ip6gre_get_size,
1686 .fill_info = ip6gre_fill_info,
1687 .get_link_net = ip6_tnl_get_link_net,
1688 };
1689
1690 /*
1691 * And now the modules code and kernel interface.
1692 */
1693
1694 static int __init ip6gre_init(void)
1695 {
1696 int err;
1697
1698 pr_info("GRE over IPv6 tunneling driver\n");
1699
1700 err = register_pernet_device(&ip6gre_net_ops);
1701 if (err < 0)
1702 return err;
1703
1704 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1705 if (err < 0) {
1706 pr_info("%s: can't add protocol\n", __func__);
1707 goto add_proto_failed;
1708 }
1709
1710 err = rtnl_link_register(&ip6gre_link_ops);
1711 if (err < 0)
1712 goto rtnl_link_failed;
1713
1714 err = rtnl_link_register(&ip6gre_tap_ops);
1715 if (err < 0)
1716 goto tap_ops_failed;
1717
1718 out:
1719 return err;
1720
1721 tap_ops_failed:
1722 rtnl_link_unregister(&ip6gre_link_ops);
1723 rtnl_link_failed:
1724 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1725 add_proto_failed:
1726 unregister_pernet_device(&ip6gre_net_ops);
1727 goto out;
1728 }
1729
1730 static void __exit ip6gre_fini(void)
1731 {
1732 rtnl_link_unregister(&ip6gre_tap_ops);
1733 rtnl_link_unregister(&ip6gre_link_ops);
1734 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1735 unregister_pernet_device(&ip6gre_net_ops);
1736 }
1737
1738 module_init(ip6gre_init);
1739 module_exit(ip6gre_fini);
1740 MODULE_LICENSE("GPL");
1741 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1742 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1743 MODULE_ALIAS_RTNL_LINK("ip6gre");
1744 MODULE_ALIAS_RTNL_LINK("ip6gretap");
1745 MODULE_ALIAS_NETDEV("ip6gre0");
Linux kernel - Deliverables
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