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Linux 3.7.4
[linux/fpc-iii.git] / net / ipv6 / ip6_gre.c
blobd5cb3c4e66f888bf056b4103cfd684f8a3e0a7a0
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/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 IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
64 #define IPV6_TCLASS_SHIFT 20
65
66 #define HASH_SIZE_SHIFT 5
67 #define HASH_SIZE (1 << HASH_SIZE_SHIFT)
68
69 static int ip6gre_net_id __read_mostly;
70 struct ip6gre_net {
71 struct ip6_tnl __rcu *tunnels[4][HASH_SIZE];
72
73 struct net_device *fb_tunnel_dev;
74 };
75
76 static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
77 static int ip6gre_tunnel_init(struct net_device *dev);
78 static void ip6gre_tunnel_setup(struct net_device *dev);
79 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
80 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
81
82 /* Tunnel hash table */
83
84 /*
85 4 hash tables:
86
87 3: (remote,local)
88 2: (remote,*)
89 1: (*,local)
90 0: (*,*)
91
92 We require exact key match i.e. if a key is present in packet
93 it will match only tunnel with the same key; if it is not present,
94 it will match only keyless tunnel.
95
96 All keysless packets, if not matched configured keyless tunnels
97 will match fallback tunnel.
98 */
99
100 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(HASH_SIZE - 1))
101 static u32 HASH_ADDR(const struct in6_addr *addr)
102 {
103 u32 hash = ipv6_addr_hash(addr);
104
105 return hash_32(hash, HASH_SIZE_SHIFT);
106 }
107
108 #define tunnels_r_l tunnels[3]
109 #define tunnels_r tunnels[2]
110 #define tunnels_l tunnels[1]
111 #define tunnels_wc tunnels[0]
112 /*
113 * Locking : hash tables are protected by RCU and RTNL
114 */
115
116 #define for_each_ip_tunnel_rcu(start) \
117 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
118
119 /* often modified stats are per cpu, other are shared (netdev->stats) */
120 struct pcpu_tstats {
121 u64 rx_packets;
122 u64 rx_bytes;
123 u64 tx_packets;
124 u64 tx_bytes;
125 struct u64_stats_sync syncp;
126 };
127
128 static struct rtnl_link_stats64 *ip6gre_get_stats64(struct net_device *dev,
129 struct rtnl_link_stats64 *tot)
130 {
131 int i;
132
133 for_each_possible_cpu(i) {
134 const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
135 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
136 unsigned int start;
137
138 do {
139 start = u64_stats_fetch_begin_bh(&tstats->syncp);
140 rx_packets = tstats->rx_packets;
141 tx_packets = tstats->tx_packets;
142 rx_bytes = tstats->rx_bytes;
143 tx_bytes = tstats->tx_bytes;
144 } while (u64_stats_fetch_retry_bh(&tstats->syncp, start));
145
146 tot->rx_packets += rx_packets;
147 tot->tx_packets += tx_packets;
148 tot->rx_bytes += rx_bytes;
149 tot->tx_bytes += tx_bytes;
150 }
151
152 tot->multicast = dev->stats.multicast;
153 tot->rx_crc_errors = dev->stats.rx_crc_errors;
154 tot->rx_fifo_errors = dev->stats.rx_fifo_errors;
155 tot->rx_length_errors = dev->stats.rx_length_errors;
156 tot->rx_frame_errors = dev->stats.rx_frame_errors;
157 tot->rx_errors = dev->stats.rx_errors;
158
159 tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
160 tot->tx_carrier_errors = dev->stats.tx_carrier_errors;
161 tot->tx_dropped = dev->stats.tx_dropped;
162 tot->tx_aborted_errors = dev->stats.tx_aborted_errors;
163 tot->tx_errors = dev->stats.tx_errors;
164
165 return tot;
166 }
167
168 /* Given src, dst and key, find appropriate for input tunnel. */
169
170 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
171 const struct in6_addr *remote, const struct in6_addr *local,
172 __be32 key, __be16 gre_proto)
173 {
174 struct net *net = dev_net(dev);
175 int link = dev->ifindex;
176 unsigned int h0 = HASH_ADDR(remote);
177 unsigned int h1 = HASH_KEY(key);
178 struct ip6_tnl *t, *cand = NULL;
179 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
180 int dev_type = (gre_proto == htons(ETH_P_TEB)) ?
181 ARPHRD_ETHER : ARPHRD_IP6GRE;
182 int score, cand_score = 4;
183
184 for_each_ip_tunnel_rcu(ign->tunnels_r_l[h0 ^ h1]) {
185 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
186 !ipv6_addr_equal(remote, &t->parms.raddr) ||
187 key != t->parms.i_key ||
188 !(t->dev->flags & IFF_UP))
189 continue;
190
191 if (t->dev->type != ARPHRD_IP6GRE &&
192 t->dev->type != dev_type)
193 continue;
194
195 score = 0;
196 if (t->parms.link != link)
197 score |= 1;
198 if (t->dev->type != dev_type)
199 score |= 2;
200 if (score == 0)
201 return t;
202
203 if (score < cand_score) {
204 cand = t;
205 cand_score = score;
206 }
207 }
208
209 for_each_ip_tunnel_rcu(ign->tunnels_r[h0 ^ h1]) {
210 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
211 key != t->parms.i_key ||
212 !(t->dev->flags & IFF_UP))
213 continue;
214
215 if (t->dev->type != ARPHRD_IP6GRE &&
216 t->dev->type != dev_type)
217 continue;
218
219 score = 0;
220 if (t->parms.link != link)
221 score |= 1;
222 if (t->dev->type != dev_type)
223 score |= 2;
224 if (score == 0)
225 return t;
226
227 if (score < cand_score) {
228 cand = t;
229 cand_score = score;
230 }
231 }
232
233 for_each_ip_tunnel_rcu(ign->tunnels_l[h1]) {
234 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
235 (!ipv6_addr_equal(local, &t->parms.raddr) ||
236 !ipv6_addr_is_multicast(local))) ||
237 key != t->parms.i_key ||
238 !(t->dev->flags & IFF_UP))
239 continue;
240
241 if (t->dev->type != ARPHRD_IP6GRE &&
242 t->dev->type != dev_type)
243 continue;
244
245 score = 0;
246 if (t->parms.link != link)
247 score |= 1;
248 if (t->dev->type != dev_type)
249 score |= 2;
250 if (score == 0)
251 return t;
252
253 if (score < cand_score) {
254 cand = t;
255 cand_score = score;
256 }
257 }
258
259 for_each_ip_tunnel_rcu(ign->tunnels_wc[h1]) {
260 if (t->parms.i_key != key ||
261 !(t->dev->flags & IFF_UP))
262 continue;
263
264 if (t->dev->type != ARPHRD_IP6GRE &&
265 t->dev->type != dev_type)
266 continue;
267
268 score = 0;
269 if (t->parms.link != link)
270 score |= 1;
271 if (t->dev->type != dev_type)
272 score |= 2;
273 if (score == 0)
274 return t;
275
276 if (score < cand_score) {
277 cand = t;
278 cand_score = score;
279 }
280 }
281
282 if (cand != NULL)
283 return cand;
284
285 dev = ign->fb_tunnel_dev;
286 if (dev->flags & IFF_UP)
287 return netdev_priv(dev);
288
289 return NULL;
290 }
291
292 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
293 const struct __ip6_tnl_parm *p)
294 {
295 const struct in6_addr *remote = &p->raddr;
296 const struct in6_addr *local = &p->laddr;
297 unsigned int h = HASH_KEY(p->i_key);
298 int prio = 0;
299
300 if (!ipv6_addr_any(local))
301 prio |= 1;
302 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
303 prio |= 2;
304 h ^= HASH_ADDR(remote);
305 }
306
307 return &ign->tunnels[prio][h];
308 }
309
310 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
311 const struct ip6_tnl *t)
312 {
313 return __ip6gre_bucket(ign, &t->parms);
314 }
315
316 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
317 {
318 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
319
320 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
321 rcu_assign_pointer(*tp, t);
322 }
323
324 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
325 {
326 struct ip6_tnl __rcu **tp;
327 struct ip6_tnl *iter;
328
329 for (tp = ip6gre_bucket(ign, t);
330 (iter = rtnl_dereference(*tp)) != NULL;
331 tp = &iter->next) {
332 if (t == iter) {
333 rcu_assign_pointer(*tp, t->next);
334 break;
335 }
336 }
337 }
338
339 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
340 const struct __ip6_tnl_parm *parms,
341 int type)
342 {
343 const struct in6_addr *remote = &parms->raddr;
344 const struct in6_addr *local = &parms->laddr;
345 __be32 key = parms->i_key;
346 int link = parms->link;
347 struct ip6_tnl *t;
348 struct ip6_tnl __rcu **tp;
349 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
350
351 for (tp = __ip6gre_bucket(ign, parms);
352 (t = rtnl_dereference(*tp)) != NULL;
353 tp = &t->next)
354 if (ipv6_addr_equal(local, &t->parms.laddr) &&
355 ipv6_addr_equal(remote, &t->parms.raddr) &&
356 key == t->parms.i_key &&
357 link == t->parms.link &&
358 type == t->dev->type)
359 break;
360
361 return t;
362 }
363
364 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
365 const struct __ip6_tnl_parm *parms, int create)
366 {
367 struct ip6_tnl *t, *nt;
368 struct net_device *dev;
369 char name[IFNAMSIZ];
370 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
371
372 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
373 if (t || !create)
374 return t;
375
376 if (parms->name[0])
377 strlcpy(name, parms->name, IFNAMSIZ);
378 else
379 strcpy(name, "ip6gre%d");
380
381 dev = alloc_netdev(sizeof(*t), name, ip6gre_tunnel_setup);
382 if (!dev)
383 return NULL;
384
385 dev_net_set(dev, net);
386
387 nt = netdev_priv(dev);
388 nt->parms = *parms;
389 dev->rtnl_link_ops = &ip6gre_link_ops;
390
391 nt->dev = dev;
392 ip6gre_tnl_link_config(nt, 1);
393
394 if (register_netdevice(dev) < 0)
395 goto failed_free;
396
397 /* Can use a lockless transmit, unless we generate output sequences */
398 if (!(nt->parms.o_flags & GRE_SEQ))
399 dev->features |= NETIF_F_LLTX;
400
401 dev_hold(dev);
402 ip6gre_tunnel_link(ign, nt);
403 return nt;
404
405 failed_free:
406 free_netdev(dev);
407 return NULL;
408 }
409
410 static void ip6gre_tunnel_uninit(struct net_device *dev)
411 {
412 struct net *net = dev_net(dev);
413 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
414
415 ip6gre_tunnel_unlink(ign, netdev_priv(dev));
416 dev_put(dev);
417 }
418
419
420 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
421 u8 type, u8 code, int offset, __be32 info)
422 {
423 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
424 __be16 *p = (__be16 *)(skb->data + offset);
425 int grehlen = offset + 4;
426 struct ip6_tnl *t;
427 __be16 flags;
428
429 flags = p[0];
430 if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) {
431 if (flags&(GRE_VERSION|GRE_ROUTING))
432 return;
433 if (flags&GRE_KEY) {
434 grehlen += 4;
435 if (flags&GRE_CSUM)
436 grehlen += 4;
437 }
438 }
439
440 /* If only 8 bytes returned, keyed message will be dropped here */
441 if (!pskb_may_pull(skb, grehlen))
442 return;
443 ipv6h = (const struct ipv6hdr *)skb->data;
444 p = (__be16 *)(skb->data + offset);
445
446 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
447 flags & GRE_KEY ?
448 *(((__be32 *)p) + (grehlen / 4) - 1) : 0,
449 p[1]);
450 if (t == NULL)
451 return;
452
453 switch (type) {
454 __u32 teli;
455 struct ipv6_tlv_tnl_enc_lim *tel;
456 __u32 mtu;
457 case ICMPV6_DEST_UNREACH:
458 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
459 t->parms.name);
460 break;
461 case ICMPV6_TIME_EXCEED:
462 if (code == ICMPV6_EXC_HOPLIMIT) {
463 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
464 t->parms.name);
465 }
466 break;
467 case ICMPV6_PARAMPROB:
468 teli = 0;
469 if (code == ICMPV6_HDR_FIELD)
470 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
471
472 if (teli && teli == info - 2) {
473 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
474 if (tel->encap_limit == 0) {
475 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
476 t->parms.name);
477 }
478 } else {
479 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
480 t->parms.name);
481 }
482 break;
483 case ICMPV6_PKT_TOOBIG:
484 mtu = info - offset;
485 if (mtu < IPV6_MIN_MTU)
486 mtu = IPV6_MIN_MTU;
487 t->dev->mtu = mtu;
488 break;
489 }
490
491 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
492 t->err_count++;
493 else
494 t->err_count = 1;
495 t->err_time = jiffies;
496 }
497
498 static int ip6gre_rcv(struct sk_buff *skb)
499 {
500 const struct ipv6hdr *ipv6h;
501 u8 *h;
502 __be16 flags;
503 __sum16 csum = 0;
504 __be32 key = 0;
505 u32 seqno = 0;
506 struct ip6_tnl *tunnel;
507 int offset = 4;
508 __be16 gre_proto;
509 int err;
510
511 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
512 goto drop;
513
514 ipv6h = ipv6_hdr(skb);
515 h = skb->data;
516 flags = *(__be16 *)h;
517
518 if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) {
519 /* - Version must be 0.
520 - We do not support routing headers.
521 */
522 if (flags&(GRE_VERSION|GRE_ROUTING))
523 goto drop;
524
525 if (flags&GRE_CSUM) {
526 switch (skb->ip_summed) {
527 case CHECKSUM_COMPLETE:
528 csum = csum_fold(skb->csum);
529 if (!csum)
530 break;
531 /* fall through */
532 case CHECKSUM_NONE:
533 skb->csum = 0;
534 csum = __skb_checksum_complete(skb);
535 skb->ip_summed = CHECKSUM_COMPLETE;
536 }
537 offset += 4;
538 }
539 if (flags&GRE_KEY) {
540 key = *(__be32 *)(h + offset);
541 offset += 4;
542 }
543 if (flags&GRE_SEQ) {
544 seqno = ntohl(*(__be32 *)(h + offset));
545 offset += 4;
546 }
547 }
548
549 gre_proto = *(__be16 *)(h + 2);
550
551 tunnel = ip6gre_tunnel_lookup(skb->dev,
552 &ipv6h->saddr, &ipv6h->daddr, key,
553 gre_proto);
554 if (tunnel) {
555 struct pcpu_tstats *tstats;
556
557 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
558 goto drop;
559
560 if (!ip6_tnl_rcv_ctl(tunnel, &ipv6h->daddr, &ipv6h->saddr)) {
561 tunnel->dev->stats.rx_dropped++;
562 goto drop;
563 }
564
565 secpath_reset(skb);
566
567 skb->protocol = gre_proto;
568 /* WCCP version 1 and 2 protocol decoding.
569 * - Change protocol to IP
570 * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
571 */
572 if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) {
573 skb->protocol = htons(ETH_P_IP);
574 if ((*(h + offset) & 0xF0) != 0x40)
575 offset += 4;
576 }
577
578 skb->mac_header = skb->network_header;
579 __pskb_pull(skb, offset);
580 skb_postpull_rcsum(skb, skb_transport_header(skb), offset);
581 skb->pkt_type = PACKET_HOST;
582
583 if (((flags&GRE_CSUM) && csum) ||
584 (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) {
585 tunnel->dev->stats.rx_crc_errors++;
586 tunnel->dev->stats.rx_errors++;
587 goto drop;
588 }
589 if (tunnel->parms.i_flags&GRE_SEQ) {
590 if (!(flags&GRE_SEQ) ||
591 (tunnel->i_seqno &&
592 (s32)(seqno - tunnel->i_seqno) < 0)) {
593 tunnel->dev->stats.rx_fifo_errors++;
594 tunnel->dev->stats.rx_errors++;
595 goto drop;
596 }
597 tunnel->i_seqno = seqno + 1;
598 }
599
600 /* Warning: All skb pointers will be invalidated! */
601 if (tunnel->dev->type == ARPHRD_ETHER) {
602 if (!pskb_may_pull(skb, ETH_HLEN)) {
603 tunnel->dev->stats.rx_length_errors++;
604 tunnel->dev->stats.rx_errors++;
605 goto drop;
606 }
607
608 ipv6h = ipv6_hdr(skb);
609 skb->protocol = eth_type_trans(skb, tunnel->dev);
610 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
611 }
612
613 __skb_tunnel_rx(skb, tunnel->dev);
614
615 skb_reset_network_header(skb);
616
617 err = IP6_ECN_decapsulate(ipv6h, skb);
618 if (unlikely(err)) {
619 if (log_ecn_error)
620 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
621 &ipv6h->saddr,
622 ipv6_get_dsfield(ipv6h));
623 if (err > 1) {
624 ++tunnel->dev->stats.rx_frame_errors;
625 ++tunnel->dev->stats.rx_errors;
626 goto drop;
627 }
628 }
629
630 tstats = this_cpu_ptr(tunnel->dev->tstats);
631 u64_stats_update_begin(&tstats->syncp);
632 tstats->rx_packets++;
633 tstats->rx_bytes += skb->len;
634 u64_stats_update_end(&tstats->syncp);
635
636 netif_rx(skb);
637
638 return 0;
639 }
640 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
641
642 drop:
643 kfree_skb(skb);
644 return 0;
645 }
646
647 struct ipv6_tel_txoption {
648 struct ipv6_txoptions ops;
649 __u8 dst_opt[8];
650 };
651
652 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
653 {
654 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
655
656 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
657 opt->dst_opt[3] = 1;
658 opt->dst_opt[4] = encap_limit;
659 opt->dst_opt[5] = IPV6_TLV_PADN;
660 opt->dst_opt[6] = 1;
661
662 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
663 opt->ops.opt_nflen = 8;
664 }
665
666 static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
667 struct net_device *dev,
668 __u8 dsfield,
669 struct flowi6 *fl6,
670 int encap_limit,
671 __u32 *pmtu)
672 {
673 struct net *net = dev_net(dev);
674 struct ip6_tnl *tunnel = netdev_priv(dev);
675 struct net_device *tdev; /* Device to other host */
676 struct ipv6hdr *ipv6h; /* Our new IP header */
677 unsigned int max_headroom; /* The extra header space needed */
678 int gre_hlen;
679 struct ipv6_tel_txoption opt;
680 int mtu;
681 struct dst_entry *dst = NULL, *ndst = NULL;
682 struct net_device_stats *stats = &tunnel->dev->stats;
683 int err = -1;
684 u8 proto;
685 int pkt_len;
686 struct sk_buff *new_skb;
687
688 if (dev->type == ARPHRD_ETHER)
689 IPCB(skb)->flags = 0;
690
691 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) {
692 gre_hlen = 0;
693 ipv6h = (struct ipv6hdr *)skb->data;
694 fl6->daddr = ipv6h->daddr;
695 } else {
696 gre_hlen = tunnel->hlen;
697 fl6->daddr = tunnel->parms.raddr;
698 }
699
700 if (!fl6->flowi6_mark)
701 dst = ip6_tnl_dst_check(tunnel);
702
703 if (!dst) {
704 ndst = ip6_route_output(net, NULL, fl6);
705
706 if (ndst->error)
707 goto tx_err_link_failure;
708 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
709 if (IS_ERR(ndst)) {
710 err = PTR_ERR(ndst);
711 ndst = NULL;
712 goto tx_err_link_failure;
713 }
714 dst = ndst;
715 }
716
717 tdev = dst->dev;
718
719 if (tdev == dev) {
720 stats->collisions++;
721 net_warn_ratelimited("%s: Local routing loop detected!\n",
722 tunnel->parms.name);
723 goto tx_err_dst_release;
724 }
725
726 mtu = dst_mtu(dst) - sizeof(*ipv6h);
727 if (encap_limit >= 0) {
728 max_headroom += 8;
729 mtu -= 8;
730 }
731 if (mtu < IPV6_MIN_MTU)
732 mtu = IPV6_MIN_MTU;
733 if (skb_dst(skb))
734 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
735 if (skb->len > mtu) {
736 *pmtu = mtu;
737 err = -EMSGSIZE;
738 goto tx_err_dst_release;
739 }
740
741 if (tunnel->err_count > 0) {
742 if (time_before(jiffies,
743 tunnel->err_time + IP6TUNNEL_ERR_TIMEO)) {
744 tunnel->err_count--;
745
746 dst_link_failure(skb);
747 } else
748 tunnel->err_count = 0;
749 }
750
751 max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len;
752
753 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
754 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
755 new_skb = skb_realloc_headroom(skb, max_headroom);
756 if (max_headroom > dev->needed_headroom)
757 dev->needed_headroom = max_headroom;
758 if (!new_skb)
759 goto tx_err_dst_release;
760
761 if (skb->sk)
762 skb_set_owner_w(new_skb, skb->sk);
763 consume_skb(skb);
764 skb = new_skb;
765 }
766
767 skb_dst_drop(skb);
768
769 if (fl6->flowi6_mark) {
770 skb_dst_set(skb, dst);
771 ndst = NULL;
772 } else {
773 skb_dst_set_noref(skb, dst);
774 }
775
776 skb->transport_header = skb->network_header;
777
778 proto = NEXTHDR_GRE;
779 if (encap_limit >= 0) {
780 init_tel_txopt(&opt, encap_limit);
781 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
782 }
783
784 skb_push(skb, gre_hlen);
785 skb_reset_network_header(skb);
786
787 /*
788 * Push down and install the IP header.
789 */
790 ipv6h = ipv6_hdr(skb);
791 *(__be32 *)ipv6h = fl6->flowlabel | htonl(0x60000000);
792 dsfield = INET_ECN_encapsulate(0, dsfield);
793 ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield);
794 ipv6h->hop_limit = tunnel->parms.hop_limit;
795 ipv6h->nexthdr = proto;
796 ipv6h->saddr = fl6->saddr;
797 ipv6h->daddr = fl6->daddr;
798
799 ((__be16 *)(ipv6h + 1))[0] = tunnel->parms.o_flags;
800 ((__be16 *)(ipv6h + 1))[1] = (dev->type == ARPHRD_ETHER) ?
801 htons(ETH_P_TEB) : skb->protocol;
802
803 if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) {
804 __be32 *ptr = (__be32 *)(((u8 *)ipv6h) + tunnel->hlen - 4);
805
806 if (tunnel->parms.o_flags&GRE_SEQ) {
807 ++tunnel->o_seqno;
808 *ptr = htonl(tunnel->o_seqno);
809 ptr--;
810 }
811 if (tunnel->parms.o_flags&GRE_KEY) {
812 *ptr = tunnel->parms.o_key;
813 ptr--;
814 }
815 if (tunnel->parms.o_flags&GRE_CSUM) {
816 *ptr = 0;
817 *(__sum16 *)ptr = ip_compute_csum((void *)(ipv6h+1),
818 skb->len - sizeof(struct ipv6hdr));
819 }
820 }
821
822 nf_reset(skb);
823 pkt_len = skb->len;
824 err = ip6_local_out(skb);
825
826 if (net_xmit_eval(err) == 0) {
827 struct pcpu_tstats *tstats = this_cpu_ptr(tunnel->dev->tstats);
828
829 tstats->tx_bytes += pkt_len;
830 tstats->tx_packets++;
831 } else {
832 stats->tx_errors++;
833 stats->tx_aborted_errors++;
834 }
835
836 if (ndst)
837 ip6_tnl_dst_store(tunnel, ndst);
838
839 return 0;
840 tx_err_link_failure:
841 stats->tx_carrier_errors++;
842 dst_link_failure(skb);
843 tx_err_dst_release:
844 dst_release(ndst);
845 return err;
846 }
847
848 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
849 {
850 struct ip6_tnl *t = netdev_priv(dev);
851 const struct iphdr *iph = ip_hdr(skb);
852 int encap_limit = -1;
853 struct flowi6 fl6;
854 __u8 dsfield;
855 __u32 mtu;
856 int err;
857
858 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
859 encap_limit = t->parms.encap_limit;
860
861 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
862 fl6.flowi6_proto = IPPROTO_IPIP;
863
864 dsfield = ipv4_get_dsfield(iph);
865
866 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
867 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
868 & IPV6_TCLASS_MASK;
869 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
870 fl6.flowi6_mark = skb->mark;
871
872 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
873 if (err != 0) {
874 /* XXX: send ICMP error even if DF is not set. */
875 if (err == -EMSGSIZE)
876 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
877 htonl(mtu));
878 return -1;
879 }
880
881 return 0;
882 }
883
884 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
885 {
886 struct ip6_tnl *t = netdev_priv(dev);
887 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
888 int encap_limit = -1;
889 __u16 offset;
890 struct flowi6 fl6;
891 __u8 dsfield;
892 __u32 mtu;
893 int err;
894
895 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
896 return -1;
897
898 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
899 if (offset > 0) {
900 struct ipv6_tlv_tnl_enc_lim *tel;
901 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
902 if (tel->encap_limit == 0) {
903 icmpv6_send(skb, ICMPV6_PARAMPROB,
904 ICMPV6_HDR_FIELD, offset + 2);
905 return -1;
906 }
907 encap_limit = tel->encap_limit - 1;
908 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
909 encap_limit = t->parms.encap_limit;
910
911 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
912 fl6.flowi6_proto = IPPROTO_IPV6;
913
914 dsfield = ipv6_get_dsfield(ipv6h);
915 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
916 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
917 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
918 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK);
919 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
920 fl6.flowi6_mark = skb->mark;
921
922 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
923 if (err != 0) {
924 if (err == -EMSGSIZE)
925 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
926 return -1;
927 }
928
929 return 0;
930 }
931
932 /**
933 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
934 * @t: the outgoing tunnel device
935 * @hdr: IPv6 header from the incoming packet
936 *
937 * Description:
938 * Avoid trivial tunneling loop by checking that tunnel exit-point
939 * doesn't match source of incoming packet.
940 *
941 * Return:
942 * 1 if conflict,
943 * 0 else
944 **/
945
946 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
947 const struct ipv6hdr *hdr)
948 {
949 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
950 }
951
952 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
953 {
954 struct ip6_tnl *t = netdev_priv(dev);
955 int encap_limit = -1;
956 struct flowi6 fl6;
957 __u32 mtu;
958 int err;
959
960 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
961 encap_limit = t->parms.encap_limit;
962
963 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
964 fl6.flowi6_proto = skb->protocol;
965
966 err = ip6gre_xmit2(skb, dev, 0, &fl6, encap_limit, &mtu);
967
968 return err;
969 }
970
971 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
972 struct net_device *dev)
973 {
974 struct ip6_tnl *t = netdev_priv(dev);
975 struct net_device_stats *stats = &t->dev->stats;
976 int ret;
977
978 if (!ip6_tnl_xmit_ctl(t))
979 return -1;
980
981 switch (skb->protocol) {
982 case htons(ETH_P_IP):
983 ret = ip6gre_xmit_ipv4(skb, dev);
984 break;
985 case htons(ETH_P_IPV6):
986 ret = ip6gre_xmit_ipv6(skb, dev);
987 break;
988 default:
989 ret = ip6gre_xmit_other(skb, dev);
990 break;
991 }
992
993 if (ret < 0)
994 goto tx_err;
995
996 return NETDEV_TX_OK;
997
998 tx_err:
999 stats->tx_errors++;
1000 stats->tx_dropped++;
1001 kfree_skb(skb);
1002 return NETDEV_TX_OK;
1003 }
1004
1005 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1006 {
1007 struct net_device *dev = t->dev;
1008 struct __ip6_tnl_parm *p = &t->parms;
1009 struct flowi6 *fl6 = &t->fl.u.ip6;
1010 int addend = sizeof(struct ipv6hdr) + 4;
1011
1012 if (dev->type != ARPHRD_ETHER) {
1013 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1014 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1015 }
1016
1017 /* Set up flowi template */
1018 fl6->saddr = p->laddr;
1019 fl6->daddr = p->raddr;
1020 fl6->flowi6_oif = p->link;
1021 fl6->flowlabel = 0;
1022
1023 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1024 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1025 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1026 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1027
1028 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1029 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1030
1031 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1032 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1033 dev->flags |= IFF_POINTOPOINT;
1034 else
1035 dev->flags &= ~IFF_POINTOPOINT;
1036
1037 dev->iflink = p->link;
1038
1039 /* Precalculate GRE options length */
1040 if (t->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) {
1041 if (t->parms.o_flags&GRE_CSUM)
1042 addend += 4;
1043 if (t->parms.o_flags&GRE_KEY)
1044 addend += 4;
1045 if (t->parms.o_flags&GRE_SEQ)
1046 addend += 4;
1047 }
1048
1049 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1050 int strict = (ipv6_addr_type(&p->raddr) &
1051 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1052
1053 struct rt6_info *rt = rt6_lookup(dev_net(dev),
1054 &p->raddr, &p->laddr,
1055 p->link, strict);
1056
1057 if (rt == NULL)
1058 return;
1059
1060 if (rt->dst.dev) {
1061 dev->hard_header_len = rt->dst.dev->hard_header_len + addend;
1062
1063 if (set_mtu) {
1064 dev->mtu = rt->dst.dev->mtu - addend;
1065 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1066 dev->mtu -= 8;
1067
1068 if (dev->mtu < IPV6_MIN_MTU)
1069 dev->mtu = IPV6_MIN_MTU;
1070 }
1071 }
1072 dst_release(&rt->dst);
1073 }
1074
1075 t->hlen = addend;
1076 }
1077
1078 static int ip6gre_tnl_change(struct ip6_tnl *t,
1079 const struct __ip6_tnl_parm *p, int set_mtu)
1080 {
1081 t->parms.laddr = p->laddr;
1082 t->parms.raddr = p->raddr;
1083 t->parms.flags = p->flags;
1084 t->parms.hop_limit = p->hop_limit;
1085 t->parms.encap_limit = p->encap_limit;
1086 t->parms.flowinfo = p->flowinfo;
1087 t->parms.link = p->link;
1088 t->parms.proto = p->proto;
1089 t->parms.i_key = p->i_key;
1090 t->parms.o_key = p->o_key;
1091 t->parms.i_flags = p->i_flags;
1092 t->parms.o_flags = p->o_flags;
1093 ip6_tnl_dst_reset(t);
1094 ip6gre_tnl_link_config(t, set_mtu);
1095 return 0;
1096 }
1097
1098 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1099 const struct ip6_tnl_parm2 *u)
1100 {
1101 p->laddr = u->laddr;
1102 p->raddr = u->raddr;
1103 p->flags = u->flags;
1104 p->hop_limit = u->hop_limit;
1105 p->encap_limit = u->encap_limit;
1106 p->flowinfo = u->flowinfo;
1107 p->link = u->link;
1108 p->i_key = u->i_key;
1109 p->o_key = u->o_key;
1110 p->i_flags = u->i_flags;
1111 p->o_flags = u->o_flags;
1112 memcpy(p->name, u->name, sizeof(u->name));
1113 }
1114
1115 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1116 const struct __ip6_tnl_parm *p)
1117 {
1118 u->proto = IPPROTO_GRE;
1119 u->laddr = p->laddr;
1120 u->raddr = p->raddr;
1121 u->flags = p->flags;
1122 u->hop_limit = p->hop_limit;
1123 u->encap_limit = p->encap_limit;
1124 u->flowinfo = p->flowinfo;
1125 u->link = p->link;
1126 u->i_key = p->i_key;
1127 u->o_key = p->o_key;
1128 u->i_flags = p->i_flags;
1129 u->o_flags = p->o_flags;
1130 memcpy(u->name, p->name, sizeof(u->name));
1131 }
1132
1133 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1134 struct ifreq *ifr, int cmd)
1135 {
1136 int err = 0;
1137 struct ip6_tnl_parm2 p;
1138 struct __ip6_tnl_parm p1;
1139 struct ip6_tnl *t;
1140 struct net *net = dev_net(dev);
1141 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1142
1143 switch (cmd) {
1144 case SIOCGETTUNNEL:
1145 t = NULL;
1146 if (dev == ign->fb_tunnel_dev) {
1147 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1148 err = -EFAULT;
1149 break;
1150 }
1151 ip6gre_tnl_parm_from_user(&p1, &p);
1152 t = ip6gre_tunnel_locate(net, &p1, 0);
1153 }
1154 if (t == NULL)
1155 t = netdev_priv(dev);
1156 ip6gre_tnl_parm_to_user(&p, &t->parms);
1157 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1158 err = -EFAULT;
1159 break;
1160
1161 case SIOCADDTUNNEL:
1162 case SIOCCHGTUNNEL:
1163 err = -EPERM;
1164 if (!capable(CAP_NET_ADMIN))
1165 goto done;
1166
1167 err = -EFAULT;
1168 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1169 goto done;
1170
1171 err = -EINVAL;
1172 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1173 goto done;
1174
1175 if (!(p.i_flags&GRE_KEY))
1176 p.i_key = 0;
1177 if (!(p.o_flags&GRE_KEY))
1178 p.o_key = 0;
1179
1180 ip6gre_tnl_parm_from_user(&p1, &p);
1181 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1182
1183 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1184 if (t != NULL) {
1185 if (t->dev != dev) {
1186 err = -EEXIST;
1187 break;
1188 }
1189 } else {
1190 t = netdev_priv(dev);
1191
1192 ip6gre_tunnel_unlink(ign, t);
1193 synchronize_net();
1194 ip6gre_tnl_change(t, &p1, 1);
1195 ip6gre_tunnel_link(ign, t);
1196 netdev_state_change(dev);
1197 }
1198 }
1199
1200 if (t) {
1201 err = 0;
1202
1203 ip6gre_tnl_parm_to_user(&p, &t->parms);
1204 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1205 err = -EFAULT;
1206 } else
1207 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1208 break;
1209
1210 case SIOCDELTUNNEL:
1211 err = -EPERM;
1212 if (!capable(CAP_NET_ADMIN))
1213 goto done;
1214
1215 if (dev == ign->fb_tunnel_dev) {
1216 err = -EFAULT;
1217 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1218 goto done;
1219 err = -ENOENT;
1220 ip6gre_tnl_parm_from_user(&p1, &p);
1221 t = ip6gre_tunnel_locate(net, &p1, 0);
1222 if (t == NULL)
1223 goto done;
1224 err = -EPERM;
1225 if (t == netdev_priv(ign->fb_tunnel_dev))
1226 goto done;
1227 dev = t->dev;
1228 }
1229 unregister_netdevice(dev);
1230 err = 0;
1231 break;
1232
1233 default:
1234 err = -EINVAL;
1235 }
1236
1237 done:
1238 return err;
1239 }
1240
1241 static int ip6gre_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1242 {
1243 struct ip6_tnl *tunnel = netdev_priv(dev);
1244 if (new_mtu < 68 ||
1245 new_mtu > 0xFFF8 - dev->hard_header_len - tunnel->hlen)
1246 return -EINVAL;
1247 dev->mtu = new_mtu;
1248 return 0;
1249 }
1250
1251 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1252 unsigned short type,
1253 const void *daddr, const void *saddr, unsigned int len)
1254 {
1255 struct ip6_tnl *t = netdev_priv(dev);
1256 struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen);
1257 __be16 *p = (__be16 *)(ipv6h+1);
1258
1259 *(__be32 *)ipv6h = t->fl.u.ip6.flowlabel | htonl(0x60000000);
1260 ipv6h->hop_limit = t->parms.hop_limit;
1261 ipv6h->nexthdr = NEXTHDR_GRE;
1262 ipv6h->saddr = t->parms.laddr;
1263 ipv6h->daddr = t->parms.raddr;
1264
1265 p[0] = t->parms.o_flags;
1266 p[1] = htons(type);
1267
1268 /*
1269 * Set the source hardware address.
1270 */
1271
1272 if (saddr)
1273 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1274 if (daddr)
1275 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1276 if (!ipv6_addr_any(&ipv6h->daddr))
1277 return t->hlen;
1278
1279 return -t->hlen;
1280 }
1281
1282 static const struct header_ops ip6gre_header_ops = {
1283 .create = ip6gre_header,
1284 };
1285
1286 static const struct net_device_ops ip6gre_netdev_ops = {
1287 .ndo_init = ip6gre_tunnel_init,
1288 .ndo_uninit = ip6gre_tunnel_uninit,
1289 .ndo_start_xmit = ip6gre_tunnel_xmit,
1290 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1291 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1292 .ndo_get_stats64 = ip6gre_get_stats64,
1293 };
1294
1295 static void ip6gre_dev_free(struct net_device *dev)
1296 {
1297 free_percpu(dev->tstats);
1298 free_netdev(dev);
1299 }
1300
1301 static void ip6gre_tunnel_setup(struct net_device *dev)
1302 {
1303 struct ip6_tnl *t;
1304
1305 dev->netdev_ops = &ip6gre_netdev_ops;
1306 dev->destructor = ip6gre_dev_free;
1307
1308 dev->type = ARPHRD_IP6GRE;
1309 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr) + 4;
1310 dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr) - 4;
1311 t = netdev_priv(dev);
1312 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1313 dev->mtu -= 8;
1314 dev->flags |= IFF_NOARP;
1315 dev->iflink = 0;
1316 dev->addr_len = sizeof(struct in6_addr);
1317 dev->features |= NETIF_F_NETNS_LOCAL;
1318 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1319 }
1320
1321 static int ip6gre_tunnel_init(struct net_device *dev)
1322 {
1323 struct ip6_tnl *tunnel;
1324
1325 tunnel = netdev_priv(dev);
1326
1327 tunnel->dev = dev;
1328 strcpy(tunnel->parms.name, dev->name);
1329
1330 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1331 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1332
1333 if (ipv6_addr_any(&tunnel->parms.raddr))
1334 dev->header_ops = &ip6gre_header_ops;
1335
1336 dev->tstats = alloc_percpu(struct pcpu_tstats);
1337 if (!dev->tstats)
1338 return -ENOMEM;
1339
1340 return 0;
1341 }
1342
1343 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1344 {
1345 struct ip6_tnl *tunnel = netdev_priv(dev);
1346
1347 tunnel->dev = dev;
1348 strcpy(tunnel->parms.name, dev->name);
1349
1350 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1351
1352 dev_hold(dev);
1353 }
1354
1355
1356 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1357 .handler = ip6gre_rcv,
1358 .err_handler = ip6gre_err,
1359 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1360 };
1361
1362 static void ip6gre_destroy_tunnels(struct ip6gre_net *ign,
1363 struct list_head *head)
1364 {
1365 int prio;
1366
1367 for (prio = 0; prio < 4; prio++) {
1368 int h;
1369 for (h = 0; h < HASH_SIZE; h++) {
1370 struct ip6_tnl *t;
1371
1372 t = rtnl_dereference(ign->tunnels[prio][h]);
1373
1374 while (t != NULL) {
1375 unregister_netdevice_queue(t->dev, head);
1376 t = rtnl_dereference(t->next);
1377 }
1378 }
1379 }
1380 }
1381
1382 static int __net_init ip6gre_init_net(struct net *net)
1383 {
1384 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1385 int err;
1386
1387 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1388 ip6gre_tunnel_setup);
1389 if (!ign->fb_tunnel_dev) {
1390 err = -ENOMEM;
1391 goto err_alloc_dev;
1392 }
1393 dev_net_set(ign->fb_tunnel_dev, net);
1394
1395 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1396 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1397
1398 err = register_netdev(ign->fb_tunnel_dev);
1399 if (err)
1400 goto err_reg_dev;
1401
1402 rcu_assign_pointer(ign->tunnels_wc[0],
1403 netdev_priv(ign->fb_tunnel_dev));
1404 return 0;
1405
1406 err_reg_dev:
1407 ip6gre_dev_free(ign->fb_tunnel_dev);
1408 err_alloc_dev:
1409 return err;
1410 }
1411
1412 static void __net_exit ip6gre_exit_net(struct net *net)
1413 {
1414 struct ip6gre_net *ign;
1415 LIST_HEAD(list);
1416
1417 ign = net_generic(net, ip6gre_net_id);
1418 rtnl_lock();
1419 ip6gre_destroy_tunnels(ign, &list);
1420 unregister_netdevice_many(&list);
1421 rtnl_unlock();
1422 }
1423
1424 static struct pernet_operations ip6gre_net_ops = {
1425 .init = ip6gre_init_net,
1426 .exit = ip6gre_exit_net,
1427 .id = &ip6gre_net_id,
1428 .size = sizeof(struct ip6gre_net),
1429 };
1430
1431 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
1432 {
1433 __be16 flags;
1434
1435 if (!data)
1436 return 0;
1437
1438 flags = 0;
1439 if (data[IFLA_GRE_IFLAGS])
1440 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1441 if (data[IFLA_GRE_OFLAGS])
1442 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1443 if (flags & (GRE_VERSION|GRE_ROUTING))
1444 return -EINVAL;
1445
1446 return 0;
1447 }
1448
1449 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
1450 {
1451 struct in6_addr daddr;
1452
1453 if (tb[IFLA_ADDRESS]) {
1454 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1455 return -EINVAL;
1456 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1457 return -EADDRNOTAVAIL;
1458 }
1459
1460 if (!data)
1461 goto out;
1462
1463 if (data[IFLA_GRE_REMOTE]) {
1464 nla_memcpy(&daddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1465 if (ipv6_addr_any(&daddr))
1466 return -EINVAL;
1467 }
1468
1469 out:
1470 return ip6gre_tunnel_validate(tb, data);
1471 }
1472
1473
1474 static void ip6gre_netlink_parms(struct nlattr *data[],
1475 struct __ip6_tnl_parm *parms)
1476 {
1477 memset(parms, 0, sizeof(*parms));
1478
1479 if (!data)
1480 return;
1481
1482 if (data[IFLA_GRE_LINK])
1483 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1484
1485 if (data[IFLA_GRE_IFLAGS])
1486 parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]);
1487
1488 if (data[IFLA_GRE_OFLAGS])
1489 parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]);
1490
1491 if (data[IFLA_GRE_IKEY])
1492 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1493
1494 if (data[IFLA_GRE_OKEY])
1495 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1496
1497 if (data[IFLA_GRE_LOCAL])
1498 nla_memcpy(&parms->laddr, data[IFLA_GRE_LOCAL], sizeof(struct in6_addr));
1499
1500 if (data[IFLA_GRE_REMOTE])
1501 nla_memcpy(&parms->raddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1502
1503 if (data[IFLA_GRE_TTL])
1504 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1505
1506 if (data[IFLA_GRE_ENCAP_LIMIT])
1507 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1508
1509 if (data[IFLA_GRE_FLOWINFO])
1510 parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]);
1511
1512 if (data[IFLA_GRE_FLAGS])
1513 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1514 }
1515
1516 static int ip6gre_tap_init(struct net_device *dev)
1517 {
1518 struct ip6_tnl *tunnel;
1519
1520 tunnel = netdev_priv(dev);
1521
1522 tunnel->dev = dev;
1523 strcpy(tunnel->parms.name, dev->name);
1524
1525 ip6gre_tnl_link_config(tunnel, 1);
1526
1527 dev->tstats = alloc_percpu(struct pcpu_tstats);
1528 if (!dev->tstats)
1529 return -ENOMEM;
1530
1531 return 0;
1532 }
1533
1534 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1535 .ndo_init = ip6gre_tap_init,
1536 .ndo_uninit = ip6gre_tunnel_uninit,
1537 .ndo_start_xmit = ip6gre_tunnel_xmit,
1538 .ndo_set_mac_address = eth_mac_addr,
1539 .ndo_validate_addr = eth_validate_addr,
1540 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1541 .ndo_get_stats64 = ip6gre_get_stats64,
1542 };
1543
1544 static void ip6gre_tap_setup(struct net_device *dev)
1545 {
1546
1547 ether_setup(dev);
1548
1549 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1550 dev->destructor = ip6gre_dev_free;
1551
1552 dev->iflink = 0;
1553 dev->features |= NETIF_F_NETNS_LOCAL;
1554 }
1555
1556 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1557 struct nlattr *tb[], struct nlattr *data[])
1558 {
1559 struct ip6_tnl *nt;
1560 struct net *net = dev_net(dev);
1561 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1562 int err;
1563
1564 nt = netdev_priv(dev);
1565 ip6gre_netlink_parms(data, &nt->parms);
1566
1567 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1568 return -EEXIST;
1569
1570 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1571 eth_hw_addr_random(dev);
1572
1573 nt->dev = dev;
1574 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1575
1576 /* Can use a lockless transmit, unless we generate output sequences */
1577 if (!(nt->parms.o_flags & GRE_SEQ))
1578 dev->features |= NETIF_F_LLTX;
1579
1580 err = register_netdevice(dev);
1581 if (err)
1582 goto out;
1583
1584 dev_hold(dev);
1585 ip6gre_tunnel_link(ign, nt);
1586
1587 out:
1588 return err;
1589 }
1590
1591 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1592 struct nlattr *data[])
1593 {
1594 struct ip6_tnl *t, *nt;
1595 struct net *net = dev_net(dev);
1596 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1597 struct __ip6_tnl_parm p;
1598
1599 if (dev == ign->fb_tunnel_dev)
1600 return -EINVAL;
1601
1602 nt = netdev_priv(dev);
1603 ip6gre_netlink_parms(data, &p);
1604
1605 t = ip6gre_tunnel_locate(net, &p, 0);
1606
1607 if (t) {
1608 if (t->dev != dev)
1609 return -EEXIST;
1610 } else {
1611 t = nt;
1612
1613 ip6gre_tunnel_unlink(ign, t);
1614 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1615 ip6gre_tunnel_link(ign, t);
1616 netdev_state_change(dev);
1617 }
1618
1619 return 0;
1620 }
1621
1622 static size_t ip6gre_get_size(const struct net_device *dev)
1623 {
1624 return
1625 /* IFLA_GRE_LINK */
1626 nla_total_size(4) +
1627 /* IFLA_GRE_IFLAGS */
1628 nla_total_size(2) +
1629 /* IFLA_GRE_OFLAGS */
1630 nla_total_size(2) +
1631 /* IFLA_GRE_IKEY */
1632 nla_total_size(4) +
1633 /* IFLA_GRE_OKEY */
1634 nla_total_size(4) +
1635 /* IFLA_GRE_LOCAL */
1636 nla_total_size(sizeof(struct in6_addr)) +
1637 /* IFLA_GRE_REMOTE */
1638 nla_total_size(sizeof(struct in6_addr)) +
1639 /* IFLA_GRE_TTL */
1640 nla_total_size(1) +
1641 /* IFLA_GRE_TOS */
1642 nla_total_size(1) +
1643 /* IFLA_GRE_ENCAP_LIMIT */
1644 nla_total_size(1) +
1645 /* IFLA_GRE_FLOWINFO */
1646 nla_total_size(4) +
1647 /* IFLA_GRE_FLAGS */
1648 nla_total_size(4) +
1649 0;
1650 }
1651
1652 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1653 {
1654 struct ip6_tnl *t = netdev_priv(dev);
1655 struct __ip6_tnl_parm *p = &t->parms;
1656
1657 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1658 nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) ||
1659 nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) ||
1660 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1661 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
1662 nla_put(skb, IFLA_GRE_LOCAL, sizeof(struct in6_addr), &p->laddr) ||
1663 nla_put(skb, IFLA_GRE_REMOTE, sizeof(struct in6_addr), &p->raddr) ||
1664 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1665 /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/
1666 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1667 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1668 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags))
1669 goto nla_put_failure;
1670 return 0;
1671
1672 nla_put_failure:
1673 return -EMSGSIZE;
1674 }
1675
1676 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1677 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1678 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1679 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1680 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1681 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1682 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1683 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1684 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1685 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1686 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1687 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1688 };
1689
1690 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1691 .kind = "ip6gre",
1692 .maxtype = IFLA_GRE_MAX,
1693 .policy = ip6gre_policy,
1694 .priv_size = sizeof(struct ip6_tnl),
1695 .setup = ip6gre_tunnel_setup,
1696 .validate = ip6gre_tunnel_validate,
1697 .newlink = ip6gre_newlink,
1698 .changelink = ip6gre_changelink,
1699 .get_size = ip6gre_get_size,
1700 .fill_info = ip6gre_fill_info,
1701 };
1702
1703 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1704 .kind = "ip6gretap",
1705 .maxtype = IFLA_GRE_MAX,
1706 .policy = ip6gre_policy,
1707 .priv_size = sizeof(struct ip6_tnl),
1708 .setup = ip6gre_tap_setup,
1709 .validate = ip6gre_tap_validate,
1710 .newlink = ip6gre_newlink,
1711 .changelink = ip6gre_changelink,
1712 .get_size = ip6gre_get_size,
1713 .fill_info = ip6gre_fill_info,
1714 };
1715
1716 /*
1717 * And now the modules code and kernel interface.
1718 */
1719
1720 static int __init ip6gre_init(void)
1721 {
1722 int err;
1723
1724 pr_info("GRE over IPv6 tunneling driver\n");
1725
1726 err = register_pernet_device(&ip6gre_net_ops);
1727 if (err < 0)
1728 return err;
1729
1730 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1731 if (err < 0) {
1732 pr_info("%s: can't add protocol\n", __func__);
1733 goto add_proto_failed;
1734 }
1735
1736 err = rtnl_link_register(&ip6gre_link_ops);
1737 if (err < 0)
1738 goto rtnl_link_failed;
1739
1740 err = rtnl_link_register(&ip6gre_tap_ops);
1741 if (err < 0)
1742 goto tap_ops_failed;
1743
1744 out:
1745 return err;
1746
1747 tap_ops_failed:
1748 rtnl_link_unregister(&ip6gre_link_ops);
1749 rtnl_link_failed:
1750 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1751 add_proto_failed:
1752 unregister_pernet_device(&ip6gre_net_ops);
1753 goto out;
1754 }
1755
1756 static void __exit ip6gre_fini(void)
1757 {
1758 rtnl_link_unregister(&ip6gre_tap_ops);
1759 rtnl_link_unregister(&ip6gre_link_ops);
1760 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1761 unregister_pernet_device(&ip6gre_net_ops);
1762 }
1763
1764 module_init(ip6gre_init);
1765 module_exit(ip6gre_fini);
1766 MODULE_LICENSE("GPL");
1767 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1768 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1769 MODULE_ALIAS_RTNL_LINK("ip6gre");
1770 MODULE_ALIAS_NETDEV("ip6gre0");
Linux with added FPC-III support