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usblp: do not set TASK_INTERRUPTIBLE before lock
[linux/fpc-iii.git] / net / ipv6 / ip6_gre.c
blobbf6233cdb7532671804cf7a5922c8f7d6c812c01
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 IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
65 #define IPV6_TCLASS_SHIFT 20
66
67 #define HASH_SIZE_SHIFT 5
68 #define HASH_SIZE (1 << HASH_SIZE_SHIFT)
69
70 static int ip6gre_net_id __read_mostly;
71 struct ip6gre_net {
72 struct ip6_tnl __rcu *tunnels[4][HASH_SIZE];
73
74 struct net_device *fb_tunnel_dev;
75 };
76
77 static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
78 static int ip6gre_tunnel_init(struct net_device *dev);
79 static void ip6gre_tunnel_setup(struct net_device *dev);
80 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
81 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
82
83 /* Tunnel hash table */
84
85 /*
86 4 hash tables:
87
88 3: (remote,local)
89 2: (remote,*)
90 1: (*,local)
91 0: (*,*)
92
93 We require exact key match i.e. if a key is present in packet
94 it will match only tunnel with the same key; if it is not present,
95 it will match only keyless tunnel.
96
97 All keysless packets, if not matched configured keyless tunnels
98 will match fallback tunnel.
99 */
100
101 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(HASH_SIZE - 1))
102 static u32 HASH_ADDR(const struct in6_addr *addr)
103 {
104 u32 hash = ipv6_addr_hash(addr);
105
106 return hash_32(hash, HASH_SIZE_SHIFT);
107 }
108
109 #define tunnels_r_l tunnels[3]
110 #define tunnels_r tunnels[2]
111 #define tunnels_l tunnels[1]
112 #define tunnels_wc tunnels[0]
113
114 /* Given src, dst and key, find appropriate for input tunnel. */
115
116 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
117 const struct in6_addr *remote, const struct in6_addr *local,
118 __be32 key, __be16 gre_proto)
119 {
120 struct net *net = dev_net(dev);
121 int link = dev->ifindex;
122 unsigned int h0 = HASH_ADDR(remote);
123 unsigned int h1 = HASH_KEY(key);
124 struct ip6_tnl *t, *cand = NULL;
125 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
126 int dev_type = (gre_proto == htons(ETH_P_TEB)) ?
127 ARPHRD_ETHER : ARPHRD_IP6GRE;
128 int score, cand_score = 4;
129
130 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
131 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
132 !ipv6_addr_equal(remote, &t->parms.raddr) ||
133 key != t->parms.i_key ||
134 !(t->dev->flags & IFF_UP))
135 continue;
136
137 if (t->dev->type != ARPHRD_IP6GRE &&
138 t->dev->type != dev_type)
139 continue;
140
141 score = 0;
142 if (t->parms.link != link)
143 score |= 1;
144 if (t->dev->type != dev_type)
145 score |= 2;
146 if (score == 0)
147 return t;
148
149 if (score < cand_score) {
150 cand = t;
151 cand_score = score;
152 }
153 }
154
155 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
156 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
157 key != t->parms.i_key ||
158 !(t->dev->flags & IFF_UP))
159 continue;
160
161 if (t->dev->type != ARPHRD_IP6GRE &&
162 t->dev->type != dev_type)
163 continue;
164
165 score = 0;
166 if (t->parms.link != link)
167 score |= 1;
168 if (t->dev->type != dev_type)
169 score |= 2;
170 if (score == 0)
171 return t;
172
173 if (score < cand_score) {
174 cand = t;
175 cand_score = score;
176 }
177 }
178
179 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
180 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
181 (!ipv6_addr_equal(local, &t->parms.raddr) ||
182 !ipv6_addr_is_multicast(local))) ||
183 key != t->parms.i_key ||
184 !(t->dev->flags & IFF_UP))
185 continue;
186
187 if (t->dev->type != ARPHRD_IP6GRE &&
188 t->dev->type != dev_type)
189 continue;
190
191 score = 0;
192 if (t->parms.link != link)
193 score |= 1;
194 if (t->dev->type != dev_type)
195 score |= 2;
196 if (score == 0)
197 return t;
198
199 if (score < cand_score) {
200 cand = t;
201 cand_score = score;
202 }
203 }
204
205 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
206 if (t->parms.i_key != key ||
207 !(t->dev->flags & IFF_UP))
208 continue;
209
210 if (t->dev->type != ARPHRD_IP6GRE &&
211 t->dev->type != dev_type)
212 continue;
213
214 score = 0;
215 if (t->parms.link != link)
216 score |= 1;
217 if (t->dev->type != dev_type)
218 score |= 2;
219 if (score == 0)
220 return t;
221
222 if (score < cand_score) {
223 cand = t;
224 cand_score = score;
225 }
226 }
227
228 if (cand != NULL)
229 return cand;
230
231 dev = ign->fb_tunnel_dev;
232 if (dev->flags & IFF_UP)
233 return netdev_priv(dev);
234
235 return NULL;
236 }
237
238 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
239 const struct __ip6_tnl_parm *p)
240 {
241 const struct in6_addr *remote = &p->raddr;
242 const struct in6_addr *local = &p->laddr;
243 unsigned int h = HASH_KEY(p->i_key);
244 int prio = 0;
245
246 if (!ipv6_addr_any(local))
247 prio |= 1;
248 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
249 prio |= 2;
250 h ^= HASH_ADDR(remote);
251 }
252
253 return &ign->tunnels[prio][h];
254 }
255
256 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
257 const struct ip6_tnl *t)
258 {
259 return __ip6gre_bucket(ign, &t->parms);
260 }
261
262 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
263 {
264 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
265
266 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
267 rcu_assign_pointer(*tp, t);
268 }
269
270 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
271 {
272 struct ip6_tnl __rcu **tp;
273 struct ip6_tnl *iter;
274
275 for (tp = ip6gre_bucket(ign, t);
276 (iter = rtnl_dereference(*tp)) != NULL;
277 tp = &iter->next) {
278 if (t == iter) {
279 rcu_assign_pointer(*tp, t->next);
280 break;
281 }
282 }
283 }
284
285 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
286 const struct __ip6_tnl_parm *parms,
287 int type)
288 {
289 const struct in6_addr *remote = &parms->raddr;
290 const struct in6_addr *local = &parms->laddr;
291 __be32 key = parms->i_key;
292 int link = parms->link;
293 struct ip6_tnl *t;
294 struct ip6_tnl __rcu **tp;
295 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
296
297 for (tp = __ip6gre_bucket(ign, parms);
298 (t = rtnl_dereference(*tp)) != NULL;
299 tp = &t->next)
300 if (ipv6_addr_equal(local, &t->parms.laddr) &&
301 ipv6_addr_equal(remote, &t->parms.raddr) &&
302 key == t->parms.i_key &&
303 link == t->parms.link &&
304 type == t->dev->type)
305 break;
306
307 return t;
308 }
309
310 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
311 const struct __ip6_tnl_parm *parms, int create)
312 {
313 struct ip6_tnl *t, *nt;
314 struct net_device *dev;
315 char name[IFNAMSIZ];
316 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
317
318 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
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, 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 ip6gre_tnl_link_config(nt, 1);
339
340 if (register_netdevice(dev) < 0)
341 goto failed_free;
342
343 /* Can use a lockless transmit, unless we generate output sequences */
344 if (!(nt->parms.o_flags & GRE_SEQ))
345 dev->features |= NETIF_F_LLTX;
346
347 dev_hold(dev);
348 ip6gre_tunnel_link(ign, nt);
349 return nt;
350
351 failed_free:
352 free_netdev(dev);
353 return NULL;
354 }
355
356 static void ip6gre_tunnel_uninit(struct net_device *dev)
357 {
358 struct net *net = dev_net(dev);
359 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
360
361 ip6gre_tunnel_unlink(ign, netdev_priv(dev));
362 ip6_tnl_dst_reset(netdev_priv(dev));
363 dev_put(dev);
364 }
365
366
367 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
368 u8 type, u8 code, int offset, __be32 info)
369 {
370 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
371 __be16 *p = (__be16 *)(skb->data + offset);
372 int grehlen = offset + 4;
373 struct ip6_tnl *t;
374 __be16 flags;
375
376 flags = p[0];
377 if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) {
378 if (flags&(GRE_VERSION|GRE_ROUTING))
379 return;
380 if (flags&GRE_KEY) {
381 grehlen += 4;
382 if (flags&GRE_CSUM)
383 grehlen += 4;
384 }
385 }
386
387 /* If only 8 bytes returned, keyed message will be dropped here */
388 if (!pskb_may_pull(skb, grehlen))
389 return;
390 ipv6h = (const struct ipv6hdr *)skb->data;
391 p = (__be16 *)(skb->data + offset);
392
393 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
394 flags & GRE_KEY ?
395 *(((__be32 *)p) + (grehlen / 4) - 1) : 0,
396 p[1]);
397 if (t == NULL)
398 return;
399
400 switch (type) {
401 __u32 teli;
402 struct ipv6_tlv_tnl_enc_lim *tel;
403 __u32 mtu;
404 case ICMPV6_DEST_UNREACH:
405 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
406 t->parms.name);
407 break;
408 case ICMPV6_TIME_EXCEED:
409 if (code == ICMPV6_EXC_HOPLIMIT) {
410 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
411 t->parms.name);
412 }
413 break;
414 case ICMPV6_PARAMPROB:
415 teli = 0;
416 if (code == ICMPV6_HDR_FIELD)
417 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
418
419 if (teli && teli == info - 2) {
420 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
421 if (tel->encap_limit == 0) {
422 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
423 t->parms.name);
424 }
425 } else {
426 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
427 t->parms.name);
428 }
429 break;
430 case ICMPV6_PKT_TOOBIG:
431 mtu = info - offset;
432 if (mtu < IPV6_MIN_MTU)
433 mtu = IPV6_MIN_MTU;
434 t->dev->mtu = mtu;
435 break;
436 }
437
438 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
439 t->err_count++;
440 else
441 t->err_count = 1;
442 t->err_time = jiffies;
443 }
444
445 static int ip6gre_rcv(struct sk_buff *skb)
446 {
447 const struct ipv6hdr *ipv6h;
448 u8 *h;
449 __be16 flags;
450 __sum16 csum = 0;
451 __be32 key = 0;
452 u32 seqno = 0;
453 struct ip6_tnl *tunnel;
454 int offset = 4;
455 __be16 gre_proto;
456 int err;
457
458 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
459 goto drop;
460
461 ipv6h = ipv6_hdr(skb);
462 h = skb->data;
463 flags = *(__be16 *)h;
464
465 if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) {
466 /* - Version must be 0.
467 - We do not support routing headers.
468 */
469 if (flags&(GRE_VERSION|GRE_ROUTING))
470 goto drop;
471
472 if (flags&GRE_CSUM) {
473 switch (skb->ip_summed) {
474 case CHECKSUM_COMPLETE:
475 csum = csum_fold(skb->csum);
476 if (!csum)
477 break;
478 /* fall through */
479 case CHECKSUM_NONE:
480 skb->csum = 0;
481 csum = __skb_checksum_complete(skb);
482 skb->ip_summed = CHECKSUM_COMPLETE;
483 }
484 offset += 4;
485 }
486 if (flags&GRE_KEY) {
487 key = *(__be32 *)(h + offset);
488 offset += 4;
489 }
490 if (flags&GRE_SEQ) {
491 seqno = ntohl(*(__be32 *)(h + offset));
492 offset += 4;
493 }
494 }
495
496 gre_proto = *(__be16 *)(h + 2);
497
498 tunnel = ip6gre_tunnel_lookup(skb->dev,
499 &ipv6h->saddr, &ipv6h->daddr, key,
500 gre_proto);
501 if (tunnel) {
502 struct pcpu_tstats *tstats;
503
504 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
505 goto drop;
506
507 if (!ip6_tnl_rcv_ctl(tunnel, &ipv6h->daddr, &ipv6h->saddr)) {
508 tunnel->dev->stats.rx_dropped++;
509 goto drop;
510 }
511
512 secpath_reset(skb);
513
514 skb->protocol = gre_proto;
515 /* WCCP version 1 and 2 protocol decoding.
516 * - Change protocol to IPv6
517 * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
518 */
519 if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) {
520 skb->protocol = htons(ETH_P_IPV6);
521 if ((*(h + offset) & 0xF0) != 0x40)
522 offset += 4;
523 }
524
525 skb->mac_header = skb->network_header;
526 __pskb_pull(skb, offset);
527 skb_postpull_rcsum(skb, skb_transport_header(skb), offset);
528 skb->pkt_type = PACKET_HOST;
529
530 if (((flags&GRE_CSUM) && csum) ||
531 (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) {
532 tunnel->dev->stats.rx_crc_errors++;
533 tunnel->dev->stats.rx_errors++;
534 goto drop;
535 }
536 if (tunnel->parms.i_flags&GRE_SEQ) {
537 if (!(flags&GRE_SEQ) ||
538 (tunnel->i_seqno &&
539 (s32)(seqno - tunnel->i_seqno) < 0)) {
540 tunnel->dev->stats.rx_fifo_errors++;
541 tunnel->dev->stats.rx_errors++;
542 goto drop;
543 }
544 tunnel->i_seqno = seqno + 1;
545 }
546
547 /* Warning: All skb pointers will be invalidated! */
548 if (tunnel->dev->type == ARPHRD_ETHER) {
549 if (!pskb_may_pull(skb, ETH_HLEN)) {
550 tunnel->dev->stats.rx_length_errors++;
551 tunnel->dev->stats.rx_errors++;
552 goto drop;
553 }
554
555 ipv6h = ipv6_hdr(skb);
556 skb->protocol = eth_type_trans(skb, tunnel->dev);
557 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
558 }
559
560 __skb_tunnel_rx(skb, tunnel->dev);
561
562 skb_reset_network_header(skb);
563
564 err = IP6_ECN_decapsulate(ipv6h, skb);
565 if (unlikely(err)) {
566 if (log_ecn_error)
567 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
568 &ipv6h->saddr,
569 ipv6_get_dsfield(ipv6h));
570 if (err > 1) {
571 ++tunnel->dev->stats.rx_frame_errors;
572 ++tunnel->dev->stats.rx_errors;
573 goto drop;
574 }
575 }
576
577 tstats = this_cpu_ptr(tunnel->dev->tstats);
578 u64_stats_update_begin(&tstats->syncp);
579 tstats->rx_packets++;
580 tstats->rx_bytes += skb->len;
581 u64_stats_update_end(&tstats->syncp);
582
583 netif_rx(skb);
584
585 return 0;
586 }
587 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
588
589 drop:
590 kfree_skb(skb);
591 return 0;
592 }
593
594 struct ipv6_tel_txoption {
595 struct ipv6_txoptions ops;
596 __u8 dst_opt[8];
597 };
598
599 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
600 {
601 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
602
603 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
604 opt->dst_opt[3] = 1;
605 opt->dst_opt[4] = encap_limit;
606 opt->dst_opt[5] = IPV6_TLV_PADN;
607 opt->dst_opt[6] = 1;
608
609 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
610 opt->ops.opt_nflen = 8;
611 }
612
613 static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
614 struct net_device *dev,
615 __u8 dsfield,
616 struct flowi6 *fl6,
617 int encap_limit,
618 __u32 *pmtu)
619 {
620 struct net *net = dev_net(dev);
621 struct ip6_tnl *tunnel = netdev_priv(dev);
622 struct net_device *tdev; /* Device to other host */
623 struct ipv6hdr *ipv6h; /* Our new IP header */
624 unsigned int max_headroom = 0; /* The extra header space needed */
625 int gre_hlen;
626 struct ipv6_tel_txoption opt;
627 int mtu;
628 struct dst_entry *dst = NULL, *ndst = NULL;
629 struct net_device_stats *stats = &tunnel->dev->stats;
630 int err = -1;
631 u8 proto;
632 struct sk_buff *new_skb;
633
634 if (dev->type == ARPHRD_ETHER)
635 IPCB(skb)->flags = 0;
636
637 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) {
638 gre_hlen = 0;
639 ipv6h = (struct ipv6hdr *)skb->data;
640 fl6->daddr = ipv6h->daddr;
641 } else {
642 gre_hlen = tunnel->hlen;
643 fl6->daddr = tunnel->parms.raddr;
644 }
645
646 if (!fl6->flowi6_mark)
647 dst = ip6_tnl_dst_check(tunnel);
648
649 if (!dst) {
650 ndst = ip6_route_output(net, NULL, fl6);
651
652 if (ndst->error)
653 goto tx_err_link_failure;
654 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
655 if (IS_ERR(ndst)) {
656 err = PTR_ERR(ndst);
657 ndst = NULL;
658 goto tx_err_link_failure;
659 }
660 dst = ndst;
661 }
662
663 tdev = dst->dev;
664
665 if (tdev == dev) {
666 stats->collisions++;
667 net_warn_ratelimited("%s: Local routing loop detected!\n",
668 tunnel->parms.name);
669 goto tx_err_dst_release;
670 }
671
672 mtu = dst_mtu(dst) - sizeof(*ipv6h);
673 if (encap_limit >= 0) {
674 max_headroom += 8;
675 mtu -= 8;
676 }
677 if (mtu < IPV6_MIN_MTU)
678 mtu = IPV6_MIN_MTU;
679 if (skb_dst(skb))
680 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
681 if (skb->len > mtu) {
682 *pmtu = mtu;
683 err = -EMSGSIZE;
684 goto tx_err_dst_release;
685 }
686
687 if (tunnel->err_count > 0) {
688 if (time_before(jiffies,
689 tunnel->err_time + IP6TUNNEL_ERR_TIMEO)) {
690 tunnel->err_count--;
691
692 dst_link_failure(skb);
693 } else
694 tunnel->err_count = 0;
695 }
696
697 max_headroom += LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len;
698
699 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
700 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
701 new_skb = skb_realloc_headroom(skb, max_headroom);
702 if (max_headroom > dev->needed_headroom)
703 dev->needed_headroom = max_headroom;
704 if (!new_skb)
705 goto tx_err_dst_release;
706
707 if (skb->sk)
708 skb_set_owner_w(new_skb, skb->sk);
709 consume_skb(skb);
710 skb = new_skb;
711 }
712
713 skb_dst_drop(skb);
714
715 if (fl6->flowi6_mark) {
716 skb_dst_set(skb, dst);
717 ndst = NULL;
718 } else {
719 skb_dst_set_noref(skb, dst);
720 }
721
722 proto = NEXTHDR_GRE;
723 if (encap_limit >= 0) {
724 init_tel_txopt(&opt, encap_limit);
725 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
726 }
727
728 skb_push(skb, gre_hlen);
729 skb_reset_network_header(skb);
730 skb_set_transport_header(skb, sizeof(*ipv6h));
731
732 /*
733 * Push down and install the IP header.
734 */
735 ipv6h = ipv6_hdr(skb);
736 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), fl6->flowlabel);
737 ipv6h->hop_limit = tunnel->parms.hop_limit;
738 ipv6h->nexthdr = proto;
739 ipv6h->saddr = fl6->saddr;
740 ipv6h->daddr = fl6->daddr;
741
742 ((__be16 *)(ipv6h + 1))[0] = tunnel->parms.o_flags;
743 ((__be16 *)(ipv6h + 1))[1] = (dev->type == ARPHRD_ETHER) ?
744 htons(ETH_P_TEB) : skb->protocol;
745
746 if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) {
747 __be32 *ptr = (__be32 *)(((u8 *)ipv6h) + tunnel->hlen - 4);
748
749 if (tunnel->parms.o_flags&GRE_SEQ) {
750 ++tunnel->o_seqno;
751 *ptr = htonl(tunnel->o_seqno);
752 ptr--;
753 }
754 if (tunnel->parms.o_flags&GRE_KEY) {
755 *ptr = tunnel->parms.o_key;
756 ptr--;
757 }
758 if (tunnel->parms.o_flags&GRE_CSUM) {
759 *ptr = 0;
760 *(__sum16 *)ptr = ip_compute_csum((void *)(ipv6h+1),
761 skb->len - sizeof(struct ipv6hdr));
762 }
763 }
764
765 ip6tunnel_xmit(skb, dev);
766 if (ndst)
767 ip6_tnl_dst_store(tunnel, ndst);
768 return 0;
769 tx_err_link_failure:
770 stats->tx_carrier_errors++;
771 dst_link_failure(skb);
772 tx_err_dst_release:
773 dst_release(ndst);
774 return err;
775 }
776
777 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
778 {
779 struct ip6_tnl *t = netdev_priv(dev);
780 const struct iphdr *iph = ip_hdr(skb);
781 int encap_limit = -1;
782 struct flowi6 fl6;
783 __u8 dsfield;
784 __u32 mtu;
785 int err;
786
787 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
788 encap_limit = t->parms.encap_limit;
789
790 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
791 fl6.flowi6_proto = IPPROTO_GRE;
792
793 dsfield = ipv4_get_dsfield(iph);
794
795 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
796 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
797 & IPV6_TCLASS_MASK;
798 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
799 fl6.flowi6_mark = skb->mark;
800
801 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
802 if (err != 0) {
803 /* XXX: send ICMP error even if DF is not set. */
804 if (err == -EMSGSIZE)
805 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
806 htonl(mtu));
807 return -1;
808 }
809
810 return 0;
811 }
812
813 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
814 {
815 struct ip6_tnl *t = netdev_priv(dev);
816 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
817 int encap_limit = -1;
818 __u16 offset;
819 struct flowi6 fl6;
820 __u8 dsfield;
821 __u32 mtu;
822 int err;
823
824 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
825 return -1;
826
827 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
828 if (offset > 0) {
829 struct ipv6_tlv_tnl_enc_lim *tel;
830 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
831 if (tel->encap_limit == 0) {
832 icmpv6_send(skb, ICMPV6_PARAMPROB,
833 ICMPV6_HDR_FIELD, offset + 2);
834 return -1;
835 }
836 encap_limit = tel->encap_limit - 1;
837 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
838 encap_limit = t->parms.encap_limit;
839
840 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
841 fl6.flowi6_proto = IPPROTO_GRE;
842
843 dsfield = ipv6_get_dsfield(ipv6h);
844 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
845 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
846 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
847 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK);
848 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
849 fl6.flowi6_mark = skb->mark;
850
851 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
852 if (err != 0) {
853 if (err == -EMSGSIZE)
854 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
855 return -1;
856 }
857
858 return 0;
859 }
860
861 /**
862 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
863 * @t: the outgoing tunnel device
864 * @hdr: IPv6 header from the incoming packet
865 *
866 * Description:
867 * Avoid trivial tunneling loop by checking that tunnel exit-point
868 * doesn't match source of incoming packet.
869 *
870 * Return:
871 * 1 if conflict,
872 * 0 else
873 **/
874
875 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
876 const struct ipv6hdr *hdr)
877 {
878 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
879 }
880
881 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
882 {
883 struct ip6_tnl *t = netdev_priv(dev);
884 int encap_limit = -1;
885 struct flowi6 fl6;
886 __u32 mtu;
887 int err;
888
889 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
890 encap_limit = t->parms.encap_limit;
891
892 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
893 fl6.flowi6_proto = skb->protocol;
894
895 err = ip6gre_xmit2(skb, dev, 0, &fl6, encap_limit, &mtu);
896
897 return err;
898 }
899
900 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
901 struct net_device *dev)
902 {
903 struct ip6_tnl *t = netdev_priv(dev);
904 struct net_device_stats *stats = &t->dev->stats;
905 int ret;
906
907 if (!ip6_tnl_xmit_ctl(t))
908 goto tx_err;
909
910 switch (skb->protocol) {
911 case htons(ETH_P_IP):
912 ret = ip6gre_xmit_ipv4(skb, dev);
913 break;
914 case htons(ETH_P_IPV6):
915 ret = ip6gre_xmit_ipv6(skb, dev);
916 break;
917 default:
918 ret = ip6gre_xmit_other(skb, dev);
919 break;
920 }
921
922 if (ret < 0)
923 goto tx_err;
924
925 return NETDEV_TX_OK;
926
927 tx_err:
928 stats->tx_errors++;
929 stats->tx_dropped++;
930 kfree_skb(skb);
931 return NETDEV_TX_OK;
932 }
933
934 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
935 {
936 struct net_device *dev = t->dev;
937 struct __ip6_tnl_parm *p = &t->parms;
938 struct flowi6 *fl6 = &t->fl.u.ip6;
939 int addend = sizeof(struct ipv6hdr) + 4;
940
941 if (dev->type != ARPHRD_ETHER) {
942 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
943 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
944 }
945
946 /* Set up flowi template */
947 fl6->saddr = p->laddr;
948 fl6->daddr = p->raddr;
949 fl6->flowi6_oif = p->link;
950 fl6->flowlabel = 0;
951
952 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
953 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
954 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
955 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
956
957 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
958 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
959
960 if (p->flags&IP6_TNL_F_CAP_XMIT &&
961 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
962 dev->flags |= IFF_POINTOPOINT;
963 else
964 dev->flags &= ~IFF_POINTOPOINT;
965
966 /* Precalculate GRE options length */
967 if (t->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) {
968 if (t->parms.o_flags&GRE_CSUM)
969 addend += 4;
970 if (t->parms.o_flags&GRE_KEY)
971 addend += 4;
972 if (t->parms.o_flags&GRE_SEQ)
973 addend += 4;
974 }
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(dev_net(dev),
981 &p->raddr, &p->laddr,
982 p->link, strict);
983
984 if (rt == NULL)
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 t->hlen = addend;
1003 }
1004
1005 static int ip6gre_tnl_change(struct ip6_tnl *t,
1006 const struct __ip6_tnl_parm *p, int set_mtu)
1007 {
1008 t->parms.laddr = p->laddr;
1009 t->parms.raddr = p->raddr;
1010 t->parms.flags = p->flags;
1011 t->parms.hop_limit = p->hop_limit;
1012 t->parms.encap_limit = p->encap_limit;
1013 t->parms.flowinfo = p->flowinfo;
1014 t->parms.link = p->link;
1015 t->parms.proto = p->proto;
1016 t->parms.i_key = p->i_key;
1017 t->parms.o_key = p->o_key;
1018 t->parms.i_flags = p->i_flags;
1019 t->parms.o_flags = p->o_flags;
1020 ip6_tnl_dst_reset(t);
1021 ip6gre_tnl_link_config(t, set_mtu);
1022 return 0;
1023 }
1024
1025 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1026 const struct ip6_tnl_parm2 *u)
1027 {
1028 p->laddr = u->laddr;
1029 p->raddr = u->raddr;
1030 p->flags = u->flags;
1031 p->hop_limit = u->hop_limit;
1032 p->encap_limit = u->encap_limit;
1033 p->flowinfo = u->flowinfo;
1034 p->link = u->link;
1035 p->i_key = u->i_key;
1036 p->o_key = u->o_key;
1037 p->i_flags = u->i_flags;
1038 p->o_flags = u->o_flags;
1039 memcpy(p->name, u->name, sizeof(u->name));
1040 }
1041
1042 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1043 const struct __ip6_tnl_parm *p)
1044 {
1045 u->proto = IPPROTO_GRE;
1046 u->laddr = p->laddr;
1047 u->raddr = p->raddr;
1048 u->flags = p->flags;
1049 u->hop_limit = p->hop_limit;
1050 u->encap_limit = p->encap_limit;
1051 u->flowinfo = p->flowinfo;
1052 u->link = p->link;
1053 u->i_key = p->i_key;
1054 u->o_key = p->o_key;
1055 u->i_flags = p->i_flags;
1056 u->o_flags = p->o_flags;
1057 memcpy(u->name, p->name, sizeof(u->name));
1058 }
1059
1060 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1061 struct ifreq *ifr, int cmd)
1062 {
1063 int err = 0;
1064 struct ip6_tnl_parm2 p;
1065 struct __ip6_tnl_parm p1;
1066 struct ip6_tnl *t;
1067 struct net *net = dev_net(dev);
1068 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1069
1070 switch (cmd) {
1071 case SIOCGETTUNNEL:
1072 t = NULL;
1073 if (dev == ign->fb_tunnel_dev) {
1074 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1075 err = -EFAULT;
1076 break;
1077 }
1078 ip6gre_tnl_parm_from_user(&p1, &p);
1079 t = ip6gre_tunnel_locate(net, &p1, 0);
1080 }
1081 if (t == NULL)
1082 t = netdev_priv(dev);
1083 memset(&p, 0, sizeof(p));
1084 ip6gre_tnl_parm_to_user(&p, &t->parms);
1085 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1086 err = -EFAULT;
1087 break;
1088
1089 case SIOCADDTUNNEL:
1090 case SIOCCHGTUNNEL:
1091 err = -EPERM;
1092 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1093 goto done;
1094
1095 err = -EFAULT;
1096 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1097 goto done;
1098
1099 err = -EINVAL;
1100 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1101 goto done;
1102
1103 if (!(p.i_flags&GRE_KEY))
1104 p.i_key = 0;
1105 if (!(p.o_flags&GRE_KEY))
1106 p.o_key = 0;
1107
1108 ip6gre_tnl_parm_from_user(&p1, &p);
1109 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1110
1111 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1112 if (t != NULL) {
1113 if (t->dev != dev) {
1114 err = -EEXIST;
1115 break;
1116 }
1117 } else {
1118 t = netdev_priv(dev);
1119
1120 ip6gre_tunnel_unlink(ign, t);
1121 synchronize_net();
1122 ip6gre_tnl_change(t, &p1, 1);
1123 ip6gre_tunnel_link(ign, t);
1124 netdev_state_change(dev);
1125 }
1126 }
1127
1128 if (t) {
1129 err = 0;
1130
1131 memset(&p, 0, sizeof(p));
1132 ip6gre_tnl_parm_to_user(&p, &t->parms);
1133 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1134 err = -EFAULT;
1135 } else
1136 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1137 break;
1138
1139 case SIOCDELTUNNEL:
1140 err = -EPERM;
1141 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1142 goto done;
1143
1144 if (dev == ign->fb_tunnel_dev) {
1145 err = -EFAULT;
1146 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1147 goto done;
1148 err = -ENOENT;
1149 ip6gre_tnl_parm_from_user(&p1, &p);
1150 t = ip6gre_tunnel_locate(net, &p1, 0);
1151 if (t == NULL)
1152 goto done;
1153 err = -EPERM;
1154 if (t == netdev_priv(ign->fb_tunnel_dev))
1155 goto done;
1156 dev = t->dev;
1157 }
1158 unregister_netdevice(dev);
1159 err = 0;
1160 break;
1161
1162 default:
1163 err = -EINVAL;
1164 }
1165
1166 done:
1167 return err;
1168 }
1169
1170 static int ip6gre_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1171 {
1172 struct ip6_tnl *tunnel = netdev_priv(dev);
1173 if (new_mtu < 68 ||
1174 new_mtu > 0xFFF8 - dev->hard_header_len - tunnel->hlen)
1175 return -EINVAL;
1176 dev->mtu = new_mtu;
1177 return 0;
1178 }
1179
1180 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1181 unsigned short type,
1182 const void *daddr, const void *saddr, unsigned int len)
1183 {
1184 struct ip6_tnl *t = netdev_priv(dev);
1185 struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen);
1186 __be16 *p = (__be16 *)(ipv6h+1);
1187
1188 ip6_flow_hdr(ipv6h, 0, t->fl.u.ip6.flowlabel);
1189 ipv6h->hop_limit = t->parms.hop_limit;
1190 ipv6h->nexthdr = NEXTHDR_GRE;
1191 ipv6h->saddr = t->parms.laddr;
1192 ipv6h->daddr = t->parms.raddr;
1193
1194 p[0] = t->parms.o_flags;
1195 p[1] = htons(type);
1196
1197 /*
1198 * Set the source hardware address.
1199 */
1200
1201 if (saddr)
1202 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1203 if (daddr)
1204 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1205 if (!ipv6_addr_any(&ipv6h->daddr))
1206 return t->hlen;
1207
1208 return -t->hlen;
1209 }
1210
1211 static const struct header_ops ip6gre_header_ops = {
1212 .create = ip6gre_header,
1213 };
1214
1215 static const struct net_device_ops ip6gre_netdev_ops = {
1216 .ndo_init = ip6gre_tunnel_init,
1217 .ndo_uninit = ip6gre_tunnel_uninit,
1218 .ndo_start_xmit = ip6gre_tunnel_xmit,
1219 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1220 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1221 .ndo_get_stats64 = ip_tunnel_get_stats64,
1222 };
1223
1224 static void ip6gre_dev_free(struct net_device *dev)
1225 {
1226 free_percpu(dev->tstats);
1227 free_netdev(dev);
1228 }
1229
1230 static void ip6gre_tunnel_setup(struct net_device *dev)
1231 {
1232 struct ip6_tnl *t;
1233
1234 dev->netdev_ops = &ip6gre_netdev_ops;
1235 dev->destructor = ip6gre_dev_free;
1236
1237 dev->type = ARPHRD_IP6GRE;
1238 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr) + 4;
1239 dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr) - 4;
1240 t = netdev_priv(dev);
1241 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1242 dev->mtu -= 8;
1243 dev->flags |= IFF_NOARP;
1244 dev->iflink = 0;
1245 dev->addr_len = sizeof(struct in6_addr);
1246 dev->features |= NETIF_F_NETNS_LOCAL;
1247 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1248 }
1249
1250 static int ip6gre_tunnel_init(struct net_device *dev)
1251 {
1252 struct ip6_tnl *tunnel;
1253
1254 tunnel = netdev_priv(dev);
1255
1256 tunnel->dev = dev;
1257 strcpy(tunnel->parms.name, dev->name);
1258
1259 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1260 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1261
1262 if (ipv6_addr_any(&tunnel->parms.raddr))
1263 dev->header_ops = &ip6gre_header_ops;
1264
1265 dev->tstats = alloc_percpu(struct pcpu_tstats);
1266 if (!dev->tstats)
1267 return -ENOMEM;
1268
1269 dev->iflink = tunnel->parms.link;
1270
1271 return 0;
1272 }
1273
1274 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1275 {
1276 struct ip6_tnl *tunnel = netdev_priv(dev);
1277
1278 tunnel->dev = dev;
1279 strcpy(tunnel->parms.name, dev->name);
1280
1281 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1282
1283 dev_hold(dev);
1284 }
1285
1286 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1287 .handler = ip6gre_rcv,
1288 .err_handler = ip6gre_err,
1289 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1290 };
1291
1292 static void ip6gre_destroy_tunnels(struct ip6gre_net *ign,
1293 struct list_head *head)
1294 {
1295 int prio;
1296
1297 for (prio = 0; prio < 4; prio++) {
1298 int h;
1299 for (h = 0; h < HASH_SIZE; h++) {
1300 struct ip6_tnl *t;
1301
1302 t = rtnl_dereference(ign->tunnels[prio][h]);
1303
1304 while (t != NULL) {
1305 unregister_netdevice_queue(t->dev, head);
1306 t = rtnl_dereference(t->next);
1307 }
1308 }
1309 }
1310 }
1311
1312 static int __net_init ip6gre_init_net(struct net *net)
1313 {
1314 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1315 int err;
1316
1317 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1318 ip6gre_tunnel_setup);
1319 if (!ign->fb_tunnel_dev) {
1320 err = -ENOMEM;
1321 goto err_alloc_dev;
1322 }
1323 dev_net_set(ign->fb_tunnel_dev, net);
1324
1325 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1326 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1327
1328 err = register_netdev(ign->fb_tunnel_dev);
1329 if (err)
1330 goto err_reg_dev;
1331
1332 rcu_assign_pointer(ign->tunnels_wc[0],
1333 netdev_priv(ign->fb_tunnel_dev));
1334 return 0;
1335
1336 err_reg_dev:
1337 ip6gre_dev_free(ign->fb_tunnel_dev);
1338 err_alloc_dev:
1339 return err;
1340 }
1341
1342 static void __net_exit ip6gre_exit_net(struct net *net)
1343 {
1344 struct ip6gre_net *ign;
1345 LIST_HEAD(list);
1346
1347 ign = net_generic(net, ip6gre_net_id);
1348 rtnl_lock();
1349 ip6gre_destroy_tunnels(ign, &list);
1350 unregister_netdevice_many(&list);
1351 rtnl_unlock();
1352 }
1353
1354 static struct pernet_operations ip6gre_net_ops = {
1355 .init = ip6gre_init_net,
1356 .exit = ip6gre_exit_net,
1357 .id = &ip6gre_net_id,
1358 .size = sizeof(struct ip6gre_net),
1359 };
1360
1361 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
1362 {
1363 __be16 flags;
1364
1365 if (!data)
1366 return 0;
1367
1368 flags = 0;
1369 if (data[IFLA_GRE_IFLAGS])
1370 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1371 if (data[IFLA_GRE_OFLAGS])
1372 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1373 if (flags & (GRE_VERSION|GRE_ROUTING))
1374 return -EINVAL;
1375
1376 return 0;
1377 }
1378
1379 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
1380 {
1381 struct in6_addr daddr;
1382
1383 if (tb[IFLA_ADDRESS]) {
1384 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1385 return -EINVAL;
1386 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1387 return -EADDRNOTAVAIL;
1388 }
1389
1390 if (!data)
1391 goto out;
1392
1393 if (data[IFLA_GRE_REMOTE]) {
1394 nla_memcpy(&daddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1395 if (ipv6_addr_any(&daddr))
1396 return -EINVAL;
1397 }
1398
1399 out:
1400 return ip6gre_tunnel_validate(tb, data);
1401 }
1402
1403
1404 static void ip6gre_netlink_parms(struct nlattr *data[],
1405 struct __ip6_tnl_parm *parms)
1406 {
1407 memset(parms, 0, sizeof(*parms));
1408
1409 if (!data)
1410 return;
1411
1412 if (data[IFLA_GRE_LINK])
1413 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1414
1415 if (data[IFLA_GRE_IFLAGS])
1416 parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]);
1417
1418 if (data[IFLA_GRE_OFLAGS])
1419 parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]);
1420
1421 if (data[IFLA_GRE_IKEY])
1422 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1423
1424 if (data[IFLA_GRE_OKEY])
1425 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1426
1427 if (data[IFLA_GRE_LOCAL])
1428 nla_memcpy(&parms->laddr, data[IFLA_GRE_LOCAL], sizeof(struct in6_addr));
1429
1430 if (data[IFLA_GRE_REMOTE])
1431 nla_memcpy(&parms->raddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1432
1433 if (data[IFLA_GRE_TTL])
1434 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1435
1436 if (data[IFLA_GRE_ENCAP_LIMIT])
1437 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1438
1439 if (data[IFLA_GRE_FLOWINFO])
1440 parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]);
1441
1442 if (data[IFLA_GRE_FLAGS])
1443 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1444 }
1445
1446 static int ip6gre_tap_init(struct net_device *dev)
1447 {
1448 struct ip6_tnl *tunnel;
1449
1450 tunnel = netdev_priv(dev);
1451
1452 tunnel->dev = dev;
1453 strcpy(tunnel->parms.name, dev->name);
1454
1455 ip6gre_tnl_link_config(tunnel, 1);
1456
1457 dev->tstats = alloc_percpu(struct pcpu_tstats);
1458 if (!dev->tstats)
1459 return -ENOMEM;
1460
1461 dev->iflink = tunnel->parms.link;
1462
1463 return 0;
1464 }
1465
1466 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1467 .ndo_init = ip6gre_tap_init,
1468 .ndo_uninit = ip6gre_tunnel_uninit,
1469 .ndo_start_xmit = ip6gre_tunnel_xmit,
1470 .ndo_set_mac_address = eth_mac_addr,
1471 .ndo_validate_addr = eth_validate_addr,
1472 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1473 .ndo_get_stats64 = ip_tunnel_get_stats64,
1474 };
1475
1476 static void ip6gre_tap_setup(struct net_device *dev)
1477 {
1478
1479 ether_setup(dev);
1480
1481 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1482 dev->destructor = ip6gre_dev_free;
1483
1484 dev->iflink = 0;
1485 dev->features |= NETIF_F_NETNS_LOCAL;
1486 }
1487
1488 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1489 struct nlattr *tb[], struct nlattr *data[])
1490 {
1491 struct ip6_tnl *nt;
1492 struct net *net = dev_net(dev);
1493 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1494 int err;
1495
1496 nt = netdev_priv(dev);
1497 ip6gre_netlink_parms(data, &nt->parms);
1498
1499 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1500 return -EEXIST;
1501
1502 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1503 eth_hw_addr_random(dev);
1504
1505 nt->dev = dev;
1506 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1507
1508 /* Can use a lockless transmit, unless we generate output sequences */
1509 if (!(nt->parms.o_flags & GRE_SEQ))
1510 dev->features |= NETIF_F_LLTX;
1511
1512 err = register_netdevice(dev);
1513 if (err)
1514 goto out;
1515
1516 dev_hold(dev);
1517 ip6gre_tunnel_link(ign, nt);
1518
1519 out:
1520 return err;
1521 }
1522
1523 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1524 struct nlattr *data[])
1525 {
1526 struct ip6_tnl *t, *nt;
1527 struct net *net = dev_net(dev);
1528 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1529 struct __ip6_tnl_parm p;
1530
1531 if (dev == ign->fb_tunnel_dev)
1532 return -EINVAL;
1533
1534 nt = netdev_priv(dev);
1535 ip6gre_netlink_parms(data, &p);
1536
1537 t = ip6gre_tunnel_locate(net, &p, 0);
1538
1539 if (t) {
1540 if (t->dev != dev)
1541 return -EEXIST;
1542 } else {
1543 t = nt;
1544
1545 ip6gre_tunnel_unlink(ign, t);
1546 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1547 ip6gre_tunnel_link(ign, t);
1548 netdev_state_change(dev);
1549 }
1550
1551 return 0;
1552 }
1553
1554 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
1555 {
1556 struct net *net = dev_net(dev);
1557 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1558
1559 if (dev != ign->fb_tunnel_dev)
1560 unregister_netdevice_queue(dev, head);
1561 }
1562
1563 static size_t ip6gre_get_size(const struct net_device *dev)
1564 {
1565 return
1566 /* IFLA_GRE_LINK */
1567 nla_total_size(4) +
1568 /* IFLA_GRE_IFLAGS */
1569 nla_total_size(2) +
1570 /* IFLA_GRE_OFLAGS */
1571 nla_total_size(2) +
1572 /* IFLA_GRE_IKEY */
1573 nla_total_size(4) +
1574 /* IFLA_GRE_OKEY */
1575 nla_total_size(4) +
1576 /* IFLA_GRE_LOCAL */
1577 nla_total_size(sizeof(struct in6_addr)) +
1578 /* IFLA_GRE_REMOTE */
1579 nla_total_size(sizeof(struct in6_addr)) +
1580 /* IFLA_GRE_TTL */
1581 nla_total_size(1) +
1582 /* IFLA_GRE_TOS */
1583 nla_total_size(1) +
1584 /* IFLA_GRE_ENCAP_LIMIT */
1585 nla_total_size(1) +
1586 /* IFLA_GRE_FLOWINFO */
1587 nla_total_size(4) +
1588 /* IFLA_GRE_FLAGS */
1589 nla_total_size(4) +
1590 0;
1591 }
1592
1593 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1594 {
1595 struct ip6_tnl *t = netdev_priv(dev);
1596 struct __ip6_tnl_parm *p = &t->parms;
1597
1598 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1599 nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) ||
1600 nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) ||
1601 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1602 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
1603 nla_put(skb, IFLA_GRE_LOCAL, sizeof(struct in6_addr), &p->laddr) ||
1604 nla_put(skb, IFLA_GRE_REMOTE, sizeof(struct in6_addr), &p->raddr) ||
1605 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1606 /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/
1607 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1608 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1609 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags))
1610 goto nla_put_failure;
1611 return 0;
1612
1613 nla_put_failure:
1614 return -EMSGSIZE;
1615 }
1616
1617 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1618 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1619 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1620 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1621 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1622 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1623 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1624 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1625 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1626 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1627 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1628 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1629 };
1630
1631 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1632 .kind = "ip6gre",
1633 .maxtype = IFLA_GRE_MAX,
1634 .policy = ip6gre_policy,
1635 .priv_size = sizeof(struct ip6_tnl),
1636 .setup = ip6gre_tunnel_setup,
1637 .validate = ip6gre_tunnel_validate,
1638 .newlink = ip6gre_newlink,
1639 .changelink = ip6gre_changelink,
1640 .dellink = ip6gre_dellink,
1641 .get_size = ip6gre_get_size,
1642 .fill_info = ip6gre_fill_info,
1643 };
1644
1645 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1646 .kind = "ip6gretap",
1647 .maxtype = IFLA_GRE_MAX,
1648 .policy = ip6gre_policy,
1649 .priv_size = sizeof(struct ip6_tnl),
1650 .setup = ip6gre_tap_setup,
1651 .validate = ip6gre_tap_validate,
1652 .newlink = ip6gre_newlink,
1653 .changelink = ip6gre_changelink,
1654 .get_size = ip6gre_get_size,
1655 .fill_info = ip6gre_fill_info,
1656 };
1657
1658 /*
1659 * And now the modules code and kernel interface.
1660 */
1661
1662 static int __init ip6gre_init(void)
1663 {
1664 int err;
1665
1666 pr_info("GRE over IPv6 tunneling driver\n");
1667
1668 err = register_pernet_device(&ip6gre_net_ops);
1669 if (err < 0)
1670 return err;
1671
1672 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1673 if (err < 0) {
1674 pr_info("%s: can't add protocol\n", __func__);
1675 goto add_proto_failed;
1676 }
1677
1678 err = rtnl_link_register(&ip6gre_link_ops);
1679 if (err < 0)
1680 goto rtnl_link_failed;
1681
1682 err = rtnl_link_register(&ip6gre_tap_ops);
1683 if (err < 0)
1684 goto tap_ops_failed;
1685
1686 out:
1687 return err;
1688
1689 tap_ops_failed:
1690 rtnl_link_unregister(&ip6gre_link_ops);
1691 rtnl_link_failed:
1692 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1693 add_proto_failed:
1694 unregister_pernet_device(&ip6gre_net_ops);
1695 goto out;
1696 }
1697
1698 static void __exit ip6gre_fini(void)
1699 {
1700 rtnl_link_unregister(&ip6gre_tap_ops);
1701 rtnl_link_unregister(&ip6gre_link_ops);
1702 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1703 unregister_pernet_device(&ip6gre_net_ops);
1704 }
1705
1706 module_init(ip6gre_init);
1707 module_exit(ip6gre_fini);
1708 MODULE_LICENSE("GPL");
1709 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1710 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1711 MODULE_ALIAS_RTNL_LINK("ip6gre");
1712 MODULE_ALIAS_NETDEV("ip6gre0");
Linux with added FPC-III support