?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Linux 3.9-rc4
[linux-2.6/cjktty.git] / net / ipv6 / ip6_gre.c
blobe4efffe2522e0173a6ec96100f6cac3d34a61d1e
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 static struct rtnl_link_stats64 *ip6gre_get_stats64(struct net_device *dev,
114 struct rtnl_link_stats64 *tot)
115 {
116 int i;
117
118 for_each_possible_cpu(i) {
119 const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
120 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
121 unsigned int start;
122
123 do {
124 start = u64_stats_fetch_begin_bh(&tstats->syncp);
125 rx_packets = tstats->rx_packets;
126 tx_packets = tstats->tx_packets;
127 rx_bytes = tstats->rx_bytes;
128 tx_bytes = tstats->tx_bytes;
129 } while (u64_stats_fetch_retry_bh(&tstats->syncp, start));
130
131 tot->rx_packets += rx_packets;
132 tot->tx_packets += tx_packets;
133 tot->rx_bytes += rx_bytes;
134 tot->tx_bytes += tx_bytes;
135 }
136
137 tot->multicast = dev->stats.multicast;
138 tot->rx_crc_errors = dev->stats.rx_crc_errors;
139 tot->rx_fifo_errors = dev->stats.rx_fifo_errors;
140 tot->rx_length_errors = dev->stats.rx_length_errors;
141 tot->rx_frame_errors = dev->stats.rx_frame_errors;
142 tot->rx_errors = dev->stats.rx_errors;
143
144 tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
145 tot->tx_carrier_errors = dev->stats.tx_carrier_errors;
146 tot->tx_dropped = dev->stats.tx_dropped;
147 tot->tx_aborted_errors = dev->stats.tx_aborted_errors;
148 tot->tx_errors = dev->stats.tx_errors;
149
150 return tot;
151 }
152
153 /* Given src, dst and key, find appropriate for input tunnel. */
154
155 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
156 const struct in6_addr *remote, const struct in6_addr *local,
157 __be32 key, __be16 gre_proto)
158 {
159 struct net *net = dev_net(dev);
160 int link = dev->ifindex;
161 unsigned int h0 = HASH_ADDR(remote);
162 unsigned int h1 = HASH_KEY(key);
163 struct ip6_tnl *t, *cand = NULL;
164 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
165 int dev_type = (gre_proto == htons(ETH_P_TEB)) ?
166 ARPHRD_ETHER : ARPHRD_IP6GRE;
167 int score, cand_score = 4;
168
169 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
170 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
171 !ipv6_addr_equal(remote, &t->parms.raddr) ||
172 key != t->parms.i_key ||
173 !(t->dev->flags & IFF_UP))
174 continue;
175
176 if (t->dev->type != ARPHRD_IP6GRE &&
177 t->dev->type != dev_type)
178 continue;
179
180 score = 0;
181 if (t->parms.link != link)
182 score |= 1;
183 if (t->dev->type != dev_type)
184 score |= 2;
185 if (score == 0)
186 return t;
187
188 if (score < cand_score) {
189 cand = t;
190 cand_score = score;
191 }
192 }
193
194 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
195 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
196 key != t->parms.i_key ||
197 !(t->dev->flags & IFF_UP))
198 continue;
199
200 if (t->dev->type != ARPHRD_IP6GRE &&
201 t->dev->type != dev_type)
202 continue;
203
204 score = 0;
205 if (t->parms.link != link)
206 score |= 1;
207 if (t->dev->type != dev_type)
208 score |= 2;
209 if (score == 0)
210 return t;
211
212 if (score < cand_score) {
213 cand = t;
214 cand_score = score;
215 }
216 }
217
218 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
219 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
220 (!ipv6_addr_equal(local, &t->parms.raddr) ||
221 !ipv6_addr_is_multicast(local))) ||
222 key != t->parms.i_key ||
223 !(t->dev->flags & IFF_UP))
224 continue;
225
226 if (t->dev->type != ARPHRD_IP6GRE &&
227 t->dev->type != dev_type)
228 continue;
229
230 score = 0;
231 if (t->parms.link != link)
232 score |= 1;
233 if (t->dev->type != dev_type)
234 score |= 2;
235 if (score == 0)
236 return t;
237
238 if (score < cand_score) {
239 cand = t;
240 cand_score = score;
241 }
242 }
243
244 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
245 if (t->parms.i_key != key ||
246 !(t->dev->flags & IFF_UP))
247 continue;
248
249 if (t->dev->type != ARPHRD_IP6GRE &&
250 t->dev->type != dev_type)
251 continue;
252
253 score = 0;
254 if (t->parms.link != link)
255 score |= 1;
256 if (t->dev->type != dev_type)
257 score |= 2;
258 if (score == 0)
259 return t;
260
261 if (score < cand_score) {
262 cand = t;
263 cand_score = score;
264 }
265 }
266
267 if (cand != NULL)
268 return cand;
269
270 dev = ign->fb_tunnel_dev;
271 if (dev->flags & IFF_UP)
272 return netdev_priv(dev);
273
274 return NULL;
275 }
276
277 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
278 const struct __ip6_tnl_parm *p)
279 {
280 const struct in6_addr *remote = &p->raddr;
281 const struct in6_addr *local = &p->laddr;
282 unsigned int h = HASH_KEY(p->i_key);
283 int prio = 0;
284
285 if (!ipv6_addr_any(local))
286 prio |= 1;
287 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
288 prio |= 2;
289 h ^= HASH_ADDR(remote);
290 }
291
292 return &ign->tunnels[prio][h];
293 }
294
295 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
296 const struct ip6_tnl *t)
297 {
298 return __ip6gre_bucket(ign, &t->parms);
299 }
300
301 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
302 {
303 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
304
305 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
306 rcu_assign_pointer(*tp, t);
307 }
308
309 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
310 {
311 struct ip6_tnl __rcu **tp;
312 struct ip6_tnl *iter;
313
314 for (tp = ip6gre_bucket(ign, t);
315 (iter = rtnl_dereference(*tp)) != NULL;
316 tp = &iter->next) {
317 if (t == iter) {
318 rcu_assign_pointer(*tp, t->next);
319 break;
320 }
321 }
322 }
323
324 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
325 const struct __ip6_tnl_parm *parms,
326 int type)
327 {
328 const struct in6_addr *remote = &parms->raddr;
329 const struct in6_addr *local = &parms->laddr;
330 __be32 key = parms->i_key;
331 int link = parms->link;
332 struct ip6_tnl *t;
333 struct ip6_tnl __rcu **tp;
334 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
335
336 for (tp = __ip6gre_bucket(ign, parms);
337 (t = rtnl_dereference(*tp)) != NULL;
338 tp = &t->next)
339 if (ipv6_addr_equal(local, &t->parms.laddr) &&
340 ipv6_addr_equal(remote, &t->parms.raddr) &&
341 key == t->parms.i_key &&
342 link == t->parms.link &&
343 type == t->dev->type)
344 break;
345
346 return t;
347 }
348
349 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
350 const struct __ip6_tnl_parm *parms, int create)
351 {
352 struct ip6_tnl *t, *nt;
353 struct net_device *dev;
354 char name[IFNAMSIZ];
355 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
356
357 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
358 if (t || !create)
359 return t;
360
361 if (parms->name[0])
362 strlcpy(name, parms->name, IFNAMSIZ);
363 else
364 strcpy(name, "ip6gre%d");
365
366 dev = alloc_netdev(sizeof(*t), name, ip6gre_tunnel_setup);
367 if (!dev)
368 return NULL;
369
370 dev_net_set(dev, net);
371
372 nt = netdev_priv(dev);
373 nt->parms = *parms;
374 dev->rtnl_link_ops = &ip6gre_link_ops;
375
376 nt->dev = dev;
377 ip6gre_tnl_link_config(nt, 1);
378
379 if (register_netdevice(dev) < 0)
380 goto failed_free;
381
382 /* Can use a lockless transmit, unless we generate output sequences */
383 if (!(nt->parms.o_flags & GRE_SEQ))
384 dev->features |= NETIF_F_LLTX;
385
386 dev_hold(dev);
387 ip6gre_tunnel_link(ign, nt);
388 return nt;
389
390 failed_free:
391 free_netdev(dev);
392 return NULL;
393 }
394
395 static void ip6gre_tunnel_uninit(struct net_device *dev)
396 {
397 struct net *net = dev_net(dev);
398 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
399
400 ip6gre_tunnel_unlink(ign, netdev_priv(dev));
401 dev_put(dev);
402 }
403
404
405 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
406 u8 type, u8 code, int offset, __be32 info)
407 {
408 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
409 __be16 *p = (__be16 *)(skb->data + offset);
410 int grehlen = offset + 4;
411 struct ip6_tnl *t;
412 __be16 flags;
413
414 flags = p[0];
415 if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) {
416 if (flags&(GRE_VERSION|GRE_ROUTING))
417 return;
418 if (flags&GRE_KEY) {
419 grehlen += 4;
420 if (flags&GRE_CSUM)
421 grehlen += 4;
422 }
423 }
424
425 /* If only 8 bytes returned, keyed message will be dropped here */
426 if (!pskb_may_pull(skb, grehlen))
427 return;
428 ipv6h = (const struct ipv6hdr *)skb->data;
429 p = (__be16 *)(skb->data + offset);
430
431 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
432 flags & GRE_KEY ?
433 *(((__be32 *)p) + (grehlen / 4) - 1) : 0,
434 p[1]);
435 if (t == NULL)
436 return;
437
438 switch (type) {
439 __u32 teli;
440 struct ipv6_tlv_tnl_enc_lim *tel;
441 __u32 mtu;
442 case ICMPV6_DEST_UNREACH:
443 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
444 t->parms.name);
445 break;
446 case ICMPV6_TIME_EXCEED:
447 if (code == ICMPV6_EXC_HOPLIMIT) {
448 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
449 t->parms.name);
450 }
451 break;
452 case ICMPV6_PARAMPROB:
453 teli = 0;
454 if (code == ICMPV6_HDR_FIELD)
455 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
456
457 if (teli && teli == info - 2) {
458 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
459 if (tel->encap_limit == 0) {
460 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
461 t->parms.name);
462 }
463 } else {
464 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
465 t->parms.name);
466 }
467 break;
468 case ICMPV6_PKT_TOOBIG:
469 mtu = info - offset;
470 if (mtu < IPV6_MIN_MTU)
471 mtu = IPV6_MIN_MTU;
472 t->dev->mtu = mtu;
473 break;
474 }
475
476 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
477 t->err_count++;
478 else
479 t->err_count = 1;
480 t->err_time = jiffies;
481 }
482
483 static int ip6gre_rcv(struct sk_buff *skb)
484 {
485 const struct ipv6hdr *ipv6h;
486 u8 *h;
487 __be16 flags;
488 __sum16 csum = 0;
489 __be32 key = 0;
490 u32 seqno = 0;
491 struct ip6_tnl *tunnel;
492 int offset = 4;
493 __be16 gre_proto;
494 int err;
495
496 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
497 goto drop;
498
499 ipv6h = ipv6_hdr(skb);
500 h = skb->data;
501 flags = *(__be16 *)h;
502
503 if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) {
504 /* - Version must be 0.
505 - We do not support routing headers.
506 */
507 if (flags&(GRE_VERSION|GRE_ROUTING))
508 goto drop;
509
510 if (flags&GRE_CSUM) {
511 switch (skb->ip_summed) {
512 case CHECKSUM_COMPLETE:
513 csum = csum_fold(skb->csum);
514 if (!csum)
515 break;
516 /* fall through */
517 case CHECKSUM_NONE:
518 skb->csum = 0;
519 csum = __skb_checksum_complete(skb);
520 skb->ip_summed = CHECKSUM_COMPLETE;
521 }
522 offset += 4;
523 }
524 if (flags&GRE_KEY) {
525 key = *(__be32 *)(h + offset);
526 offset += 4;
527 }
528 if (flags&GRE_SEQ) {
529 seqno = ntohl(*(__be32 *)(h + offset));
530 offset += 4;
531 }
532 }
533
534 gre_proto = *(__be16 *)(h + 2);
535
536 tunnel = ip6gre_tunnel_lookup(skb->dev,
537 &ipv6h->saddr, &ipv6h->daddr, key,
538 gre_proto);
539 if (tunnel) {
540 struct pcpu_tstats *tstats;
541
542 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
543 goto drop;
544
545 if (!ip6_tnl_rcv_ctl(tunnel, &ipv6h->daddr, &ipv6h->saddr)) {
546 tunnel->dev->stats.rx_dropped++;
547 goto drop;
548 }
549
550 secpath_reset(skb);
551
552 skb->protocol = gre_proto;
553 /* WCCP version 1 and 2 protocol decoding.
554 * - Change protocol to IP
555 * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
556 */
557 if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) {
558 skb->protocol = htons(ETH_P_IP);
559 if ((*(h + offset) & 0xF0) != 0x40)
560 offset += 4;
561 }
562
563 skb->mac_header = skb->network_header;
564 __pskb_pull(skb, offset);
565 skb_postpull_rcsum(skb, skb_transport_header(skb), offset);
566 skb->pkt_type = PACKET_HOST;
567
568 if (((flags&GRE_CSUM) && csum) ||
569 (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) {
570 tunnel->dev->stats.rx_crc_errors++;
571 tunnel->dev->stats.rx_errors++;
572 goto drop;
573 }
574 if (tunnel->parms.i_flags&GRE_SEQ) {
575 if (!(flags&GRE_SEQ) ||
576 (tunnel->i_seqno &&
577 (s32)(seqno - tunnel->i_seqno) < 0)) {
578 tunnel->dev->stats.rx_fifo_errors++;
579 tunnel->dev->stats.rx_errors++;
580 goto drop;
581 }
582 tunnel->i_seqno = seqno + 1;
583 }
584
585 /* Warning: All skb pointers will be invalidated! */
586 if (tunnel->dev->type == ARPHRD_ETHER) {
587 if (!pskb_may_pull(skb, ETH_HLEN)) {
588 tunnel->dev->stats.rx_length_errors++;
589 tunnel->dev->stats.rx_errors++;
590 goto drop;
591 }
592
593 ipv6h = ipv6_hdr(skb);
594 skb->protocol = eth_type_trans(skb, tunnel->dev);
595 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
596 }
597
598 __skb_tunnel_rx(skb, tunnel->dev);
599
600 skb_reset_network_header(skb);
601
602 err = IP6_ECN_decapsulate(ipv6h, skb);
603 if (unlikely(err)) {
604 if (log_ecn_error)
605 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
606 &ipv6h->saddr,
607 ipv6_get_dsfield(ipv6h));
608 if (err > 1) {
609 ++tunnel->dev->stats.rx_frame_errors;
610 ++tunnel->dev->stats.rx_errors;
611 goto drop;
612 }
613 }
614
615 tstats = this_cpu_ptr(tunnel->dev->tstats);
616 u64_stats_update_begin(&tstats->syncp);
617 tstats->rx_packets++;
618 tstats->rx_bytes += skb->len;
619 u64_stats_update_end(&tstats->syncp);
620
621 netif_rx(skb);
622
623 return 0;
624 }
625 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
626
627 drop:
628 kfree_skb(skb);
629 return 0;
630 }
631
632 struct ipv6_tel_txoption {
633 struct ipv6_txoptions ops;
634 __u8 dst_opt[8];
635 };
636
637 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
638 {
639 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
640
641 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
642 opt->dst_opt[3] = 1;
643 opt->dst_opt[4] = encap_limit;
644 opt->dst_opt[5] = IPV6_TLV_PADN;
645 opt->dst_opt[6] = 1;
646
647 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
648 opt->ops.opt_nflen = 8;
649 }
650
651 static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
652 struct net_device *dev,
653 __u8 dsfield,
654 struct flowi6 *fl6,
655 int encap_limit,
656 __u32 *pmtu)
657 {
658 struct net *net = dev_net(dev);
659 struct ip6_tnl *tunnel = netdev_priv(dev);
660 struct net_device *tdev; /* Device to other host */
661 struct ipv6hdr *ipv6h; /* Our new IP header */
662 unsigned int max_headroom; /* The extra header space needed */
663 int gre_hlen;
664 struct ipv6_tel_txoption opt;
665 int mtu;
666 struct dst_entry *dst = NULL, *ndst = NULL;
667 struct net_device_stats *stats = &tunnel->dev->stats;
668 int err = -1;
669 u8 proto;
670 int pkt_len;
671 struct sk_buff *new_skb;
672
673 if (dev->type == ARPHRD_ETHER)
674 IPCB(skb)->flags = 0;
675
676 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) {
677 gre_hlen = 0;
678 ipv6h = (struct ipv6hdr *)skb->data;
679 fl6->daddr = ipv6h->daddr;
680 } else {
681 gre_hlen = tunnel->hlen;
682 fl6->daddr = tunnel->parms.raddr;
683 }
684
685 if (!fl6->flowi6_mark)
686 dst = ip6_tnl_dst_check(tunnel);
687
688 if (!dst) {
689 ndst = ip6_route_output(net, NULL, fl6);
690
691 if (ndst->error)
692 goto tx_err_link_failure;
693 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
694 if (IS_ERR(ndst)) {
695 err = PTR_ERR(ndst);
696 ndst = NULL;
697 goto tx_err_link_failure;
698 }
699 dst = ndst;
700 }
701
702 tdev = dst->dev;
703
704 if (tdev == dev) {
705 stats->collisions++;
706 net_warn_ratelimited("%s: Local routing loop detected!\n",
707 tunnel->parms.name);
708 goto tx_err_dst_release;
709 }
710
711 mtu = dst_mtu(dst) - sizeof(*ipv6h);
712 if (encap_limit >= 0) {
713 max_headroom += 8;
714 mtu -= 8;
715 }
716 if (mtu < IPV6_MIN_MTU)
717 mtu = IPV6_MIN_MTU;
718 if (skb_dst(skb))
719 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
720 if (skb->len > mtu) {
721 *pmtu = mtu;
722 err = -EMSGSIZE;
723 goto tx_err_dst_release;
724 }
725
726 if (tunnel->err_count > 0) {
727 if (time_before(jiffies,
728 tunnel->err_time + IP6TUNNEL_ERR_TIMEO)) {
729 tunnel->err_count--;
730
731 dst_link_failure(skb);
732 } else
733 tunnel->err_count = 0;
734 }
735
736 max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len;
737
738 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
739 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
740 new_skb = skb_realloc_headroom(skb, max_headroom);
741 if (max_headroom > dev->needed_headroom)
742 dev->needed_headroom = max_headroom;
743 if (!new_skb)
744 goto tx_err_dst_release;
745
746 if (skb->sk)
747 skb_set_owner_w(new_skb, skb->sk);
748 consume_skb(skb);
749 skb = new_skb;
750 }
751
752 skb_dst_drop(skb);
753
754 if (fl6->flowi6_mark) {
755 skb_dst_set(skb, dst);
756 ndst = NULL;
757 } else {
758 skb_dst_set_noref(skb, dst);
759 }
760
761 proto = NEXTHDR_GRE;
762 if (encap_limit >= 0) {
763 init_tel_txopt(&opt, encap_limit);
764 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
765 }
766
767 skb_push(skb, gre_hlen);
768 skb_reset_network_header(skb);
769 skb_set_transport_header(skb, sizeof(*ipv6h));
770
771 /*
772 * Push down and install the IP header.
773 */
774 ipv6h = ipv6_hdr(skb);
775 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), fl6->flowlabel);
776 ipv6h->hop_limit = tunnel->parms.hop_limit;
777 ipv6h->nexthdr = proto;
778 ipv6h->saddr = fl6->saddr;
779 ipv6h->daddr = fl6->daddr;
780
781 ((__be16 *)(ipv6h + 1))[0] = tunnel->parms.o_flags;
782 ((__be16 *)(ipv6h + 1))[1] = (dev->type == ARPHRD_ETHER) ?
783 htons(ETH_P_TEB) : skb->protocol;
784
785 if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) {
786 __be32 *ptr = (__be32 *)(((u8 *)ipv6h) + tunnel->hlen - 4);
787
788 if (tunnel->parms.o_flags&GRE_SEQ) {
789 ++tunnel->o_seqno;
790 *ptr = htonl(tunnel->o_seqno);
791 ptr--;
792 }
793 if (tunnel->parms.o_flags&GRE_KEY) {
794 *ptr = tunnel->parms.o_key;
795 ptr--;
796 }
797 if (tunnel->parms.o_flags&GRE_CSUM) {
798 *ptr = 0;
799 *(__sum16 *)ptr = ip_compute_csum((void *)(ipv6h+1),
800 skb->len - sizeof(struct ipv6hdr));
801 }
802 }
803
804 nf_reset(skb);
805 pkt_len = skb->len;
806 err = ip6_local_out(skb);
807
808 if (net_xmit_eval(err) == 0) {
809 struct pcpu_tstats *tstats = this_cpu_ptr(tunnel->dev->tstats);
810
811 tstats->tx_bytes += pkt_len;
812 tstats->tx_packets++;
813 } else {
814 stats->tx_errors++;
815 stats->tx_aborted_errors++;
816 }
817
818 if (ndst)
819 ip6_tnl_dst_store(tunnel, ndst);
820
821 return 0;
822 tx_err_link_failure:
823 stats->tx_carrier_errors++;
824 dst_link_failure(skb);
825 tx_err_dst_release:
826 dst_release(ndst);
827 return err;
828 }
829
830 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
831 {
832 struct ip6_tnl *t = netdev_priv(dev);
833 const struct iphdr *iph = ip_hdr(skb);
834 int encap_limit = -1;
835 struct flowi6 fl6;
836 __u8 dsfield;
837 __u32 mtu;
838 int err;
839
840 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
841 encap_limit = t->parms.encap_limit;
842
843 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
844 fl6.flowi6_proto = IPPROTO_IPIP;
845
846 dsfield = ipv4_get_dsfield(iph);
847
848 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
849 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
850 & IPV6_TCLASS_MASK;
851 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
852 fl6.flowi6_mark = skb->mark;
853
854 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
855 if (err != 0) {
856 /* XXX: send ICMP error even if DF is not set. */
857 if (err == -EMSGSIZE)
858 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
859 htonl(mtu));
860 return -1;
861 }
862
863 return 0;
864 }
865
866 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
867 {
868 struct ip6_tnl *t = netdev_priv(dev);
869 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
870 int encap_limit = -1;
871 __u16 offset;
872 struct flowi6 fl6;
873 __u8 dsfield;
874 __u32 mtu;
875 int err;
876
877 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
878 return -1;
879
880 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
881 if (offset > 0) {
882 struct ipv6_tlv_tnl_enc_lim *tel;
883 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
884 if (tel->encap_limit == 0) {
885 icmpv6_send(skb, ICMPV6_PARAMPROB,
886 ICMPV6_HDR_FIELD, offset + 2);
887 return -1;
888 }
889 encap_limit = tel->encap_limit - 1;
890 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
891 encap_limit = t->parms.encap_limit;
892
893 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
894 fl6.flowi6_proto = IPPROTO_IPV6;
895
896 dsfield = ipv6_get_dsfield(ipv6h);
897 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
898 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
899 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
900 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK);
901 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
902 fl6.flowi6_mark = skb->mark;
903
904 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
905 if (err != 0) {
906 if (err == -EMSGSIZE)
907 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
908 return -1;
909 }
910
911 return 0;
912 }
913
914 /**
915 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
916 * @t: the outgoing tunnel device
917 * @hdr: IPv6 header from the incoming packet
918 *
919 * Description:
920 * Avoid trivial tunneling loop by checking that tunnel exit-point
921 * doesn't match source of incoming packet.
922 *
923 * Return:
924 * 1 if conflict,
925 * 0 else
926 **/
927
928 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
929 const struct ipv6hdr *hdr)
930 {
931 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
932 }
933
934 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
935 {
936 struct ip6_tnl *t = netdev_priv(dev);
937 int encap_limit = -1;
938 struct flowi6 fl6;
939 __u32 mtu;
940 int err;
941
942 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
943 encap_limit = t->parms.encap_limit;
944
945 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
946 fl6.flowi6_proto = skb->protocol;
947
948 err = ip6gre_xmit2(skb, dev, 0, &fl6, encap_limit, &mtu);
949
950 return err;
951 }
952
953 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
954 struct net_device *dev)
955 {
956 struct ip6_tnl *t = netdev_priv(dev);
957 struct net_device_stats *stats = &t->dev->stats;
958 int ret;
959
960 if (!ip6_tnl_xmit_ctl(t))
961 goto tx_err;
962
963 switch (skb->protocol) {
964 case htons(ETH_P_IP):
965 ret = ip6gre_xmit_ipv4(skb, dev);
966 break;
967 case htons(ETH_P_IPV6):
968 ret = ip6gre_xmit_ipv6(skb, dev);
969 break;
970 default:
971 ret = ip6gre_xmit_other(skb, dev);
972 break;
973 }
974
975 if (ret < 0)
976 goto tx_err;
977
978 return NETDEV_TX_OK;
979
980 tx_err:
981 stats->tx_errors++;
982 stats->tx_dropped++;
983 kfree_skb(skb);
984 return NETDEV_TX_OK;
985 }
986
987 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
988 {
989 struct net_device *dev = t->dev;
990 struct __ip6_tnl_parm *p = &t->parms;
991 struct flowi6 *fl6 = &t->fl.u.ip6;
992 int addend = sizeof(struct ipv6hdr) + 4;
993
994 if (dev->type != ARPHRD_ETHER) {
995 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
996 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
997 }
998
999 /* Set up flowi template */
1000 fl6->saddr = p->laddr;
1001 fl6->daddr = p->raddr;
1002 fl6->flowi6_oif = p->link;
1003 fl6->flowlabel = 0;
1004
1005 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1006 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1007 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1008 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1009
1010 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1011 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1012
1013 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1014 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1015 dev->flags |= IFF_POINTOPOINT;
1016 else
1017 dev->flags &= ~IFF_POINTOPOINT;
1018
1019 dev->iflink = p->link;
1020
1021 /* Precalculate GRE options length */
1022 if (t->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) {
1023 if (t->parms.o_flags&GRE_CSUM)
1024 addend += 4;
1025 if (t->parms.o_flags&GRE_KEY)
1026 addend += 4;
1027 if (t->parms.o_flags&GRE_SEQ)
1028 addend += 4;
1029 }
1030
1031 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1032 int strict = (ipv6_addr_type(&p->raddr) &
1033 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1034
1035 struct rt6_info *rt = rt6_lookup(dev_net(dev),
1036 &p->raddr, &p->laddr,
1037 p->link, strict);
1038
1039 if (rt == NULL)
1040 return;
1041
1042 if (rt->dst.dev) {
1043 dev->hard_header_len = rt->dst.dev->hard_header_len + addend;
1044
1045 if (set_mtu) {
1046 dev->mtu = rt->dst.dev->mtu - addend;
1047 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1048 dev->mtu -= 8;
1049
1050 if (dev->mtu < IPV6_MIN_MTU)
1051 dev->mtu = IPV6_MIN_MTU;
1052 }
1053 }
1054 ip6_rt_put(rt);
1055 }
1056
1057 t->hlen = addend;
1058 }
1059
1060 static int ip6gre_tnl_change(struct ip6_tnl *t,
1061 const struct __ip6_tnl_parm *p, int set_mtu)
1062 {
1063 t->parms.laddr = p->laddr;
1064 t->parms.raddr = p->raddr;
1065 t->parms.flags = p->flags;
1066 t->parms.hop_limit = p->hop_limit;
1067 t->parms.encap_limit = p->encap_limit;
1068 t->parms.flowinfo = p->flowinfo;
1069 t->parms.link = p->link;
1070 t->parms.proto = p->proto;
1071 t->parms.i_key = p->i_key;
1072 t->parms.o_key = p->o_key;
1073 t->parms.i_flags = p->i_flags;
1074 t->parms.o_flags = p->o_flags;
1075 ip6_tnl_dst_reset(t);
1076 ip6gre_tnl_link_config(t, set_mtu);
1077 return 0;
1078 }
1079
1080 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1081 const struct ip6_tnl_parm2 *u)
1082 {
1083 p->laddr = u->laddr;
1084 p->raddr = u->raddr;
1085 p->flags = u->flags;
1086 p->hop_limit = u->hop_limit;
1087 p->encap_limit = u->encap_limit;
1088 p->flowinfo = u->flowinfo;
1089 p->link = u->link;
1090 p->i_key = u->i_key;
1091 p->o_key = u->o_key;
1092 p->i_flags = u->i_flags;
1093 p->o_flags = u->o_flags;
1094 memcpy(p->name, u->name, sizeof(u->name));
1095 }
1096
1097 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1098 const struct __ip6_tnl_parm *p)
1099 {
1100 u->proto = IPPROTO_GRE;
1101 u->laddr = p->laddr;
1102 u->raddr = p->raddr;
1103 u->flags = p->flags;
1104 u->hop_limit = p->hop_limit;
1105 u->encap_limit = p->encap_limit;
1106 u->flowinfo = p->flowinfo;
1107 u->link = p->link;
1108 u->i_key = p->i_key;
1109 u->o_key = p->o_key;
1110 u->i_flags = p->i_flags;
1111 u->o_flags = p->o_flags;
1112 memcpy(u->name, p->name, sizeof(u->name));
1113 }
1114
1115 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1116 struct ifreq *ifr, int cmd)
1117 {
1118 int err = 0;
1119 struct ip6_tnl_parm2 p;
1120 struct __ip6_tnl_parm p1;
1121 struct ip6_tnl *t;
1122 struct net *net = dev_net(dev);
1123 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1124
1125 switch (cmd) {
1126 case SIOCGETTUNNEL:
1127 t = NULL;
1128 if (dev == ign->fb_tunnel_dev) {
1129 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1130 err = -EFAULT;
1131 break;
1132 }
1133 ip6gre_tnl_parm_from_user(&p1, &p);
1134 t = ip6gre_tunnel_locate(net, &p1, 0);
1135 }
1136 if (t == NULL)
1137 t = netdev_priv(dev);
1138 ip6gre_tnl_parm_to_user(&p, &t->parms);
1139 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1140 err = -EFAULT;
1141 break;
1142
1143 case SIOCADDTUNNEL:
1144 case SIOCCHGTUNNEL:
1145 err = -EPERM;
1146 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1147 goto done;
1148
1149 err = -EFAULT;
1150 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1151 goto done;
1152
1153 err = -EINVAL;
1154 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1155 goto done;
1156
1157 if (!(p.i_flags&GRE_KEY))
1158 p.i_key = 0;
1159 if (!(p.o_flags&GRE_KEY))
1160 p.o_key = 0;
1161
1162 ip6gre_tnl_parm_from_user(&p1, &p);
1163 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1164
1165 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1166 if (t != NULL) {
1167 if (t->dev != dev) {
1168 err = -EEXIST;
1169 break;
1170 }
1171 } else {
1172 t = netdev_priv(dev);
1173
1174 ip6gre_tunnel_unlink(ign, t);
1175 synchronize_net();
1176 ip6gre_tnl_change(t, &p1, 1);
1177 ip6gre_tunnel_link(ign, t);
1178 netdev_state_change(dev);
1179 }
1180 }
1181
1182 if (t) {
1183 err = 0;
1184
1185 ip6gre_tnl_parm_to_user(&p, &t->parms);
1186 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1187 err = -EFAULT;
1188 } else
1189 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1190 break;
1191
1192 case SIOCDELTUNNEL:
1193 err = -EPERM;
1194 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1195 goto done;
1196
1197 if (dev == ign->fb_tunnel_dev) {
1198 err = -EFAULT;
1199 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1200 goto done;
1201 err = -ENOENT;
1202 ip6gre_tnl_parm_from_user(&p1, &p);
1203 t = ip6gre_tunnel_locate(net, &p1, 0);
1204 if (t == NULL)
1205 goto done;
1206 err = -EPERM;
1207 if (t == netdev_priv(ign->fb_tunnel_dev))
1208 goto done;
1209 dev = t->dev;
1210 }
1211 unregister_netdevice(dev);
1212 err = 0;
1213 break;
1214
1215 default:
1216 err = -EINVAL;
1217 }
1218
1219 done:
1220 return err;
1221 }
1222
1223 static int ip6gre_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1224 {
1225 struct ip6_tnl *tunnel = netdev_priv(dev);
1226 if (new_mtu < 68 ||
1227 new_mtu > 0xFFF8 - dev->hard_header_len - tunnel->hlen)
1228 return -EINVAL;
1229 dev->mtu = new_mtu;
1230 return 0;
1231 }
1232
1233 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1234 unsigned short type,
1235 const void *daddr, const void *saddr, unsigned int len)
1236 {
1237 struct ip6_tnl *t = netdev_priv(dev);
1238 struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen);
1239 __be16 *p = (__be16 *)(ipv6h+1);
1240
1241 ip6_flow_hdr(ipv6h, 0, t->fl.u.ip6.flowlabel);
1242 ipv6h->hop_limit = t->parms.hop_limit;
1243 ipv6h->nexthdr = NEXTHDR_GRE;
1244 ipv6h->saddr = t->parms.laddr;
1245 ipv6h->daddr = t->parms.raddr;
1246
1247 p[0] = t->parms.o_flags;
1248 p[1] = htons(type);
1249
1250 /*
1251 * Set the source hardware address.
1252 */
1253
1254 if (saddr)
1255 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1256 if (daddr)
1257 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1258 if (!ipv6_addr_any(&ipv6h->daddr))
1259 return t->hlen;
1260
1261 return -t->hlen;
1262 }
1263
1264 static const struct header_ops ip6gre_header_ops = {
1265 .create = ip6gre_header,
1266 };
1267
1268 static const struct net_device_ops ip6gre_netdev_ops = {
1269 .ndo_init = ip6gre_tunnel_init,
1270 .ndo_uninit = ip6gre_tunnel_uninit,
1271 .ndo_start_xmit = ip6gre_tunnel_xmit,
1272 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1273 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1274 .ndo_get_stats64 = ip6gre_get_stats64,
1275 };
1276
1277 static void ip6gre_dev_free(struct net_device *dev)
1278 {
1279 free_percpu(dev->tstats);
1280 free_netdev(dev);
1281 }
1282
1283 static void ip6gre_tunnel_setup(struct net_device *dev)
1284 {
1285 struct ip6_tnl *t;
1286
1287 dev->netdev_ops = &ip6gre_netdev_ops;
1288 dev->destructor = ip6gre_dev_free;
1289
1290 dev->type = ARPHRD_IP6GRE;
1291 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr) + 4;
1292 dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr) - 4;
1293 t = netdev_priv(dev);
1294 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1295 dev->mtu -= 8;
1296 dev->flags |= IFF_NOARP;
1297 dev->iflink = 0;
1298 dev->addr_len = sizeof(struct in6_addr);
1299 dev->features |= NETIF_F_NETNS_LOCAL;
1300 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1301 }
1302
1303 static int ip6gre_tunnel_init(struct net_device *dev)
1304 {
1305 struct ip6_tnl *tunnel;
1306
1307 tunnel = netdev_priv(dev);
1308
1309 tunnel->dev = dev;
1310 strcpy(tunnel->parms.name, dev->name);
1311
1312 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1313 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1314
1315 if (ipv6_addr_any(&tunnel->parms.raddr))
1316 dev->header_ops = &ip6gre_header_ops;
1317
1318 dev->tstats = alloc_percpu(struct pcpu_tstats);
1319 if (!dev->tstats)
1320 return -ENOMEM;
1321
1322 return 0;
1323 }
1324
1325 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1326 {
1327 struct ip6_tnl *tunnel = netdev_priv(dev);
1328
1329 tunnel->dev = dev;
1330 strcpy(tunnel->parms.name, dev->name);
1331
1332 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1333
1334 dev_hold(dev);
1335 }
1336
1337
1338 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1339 .handler = ip6gre_rcv,
1340 .err_handler = ip6gre_err,
1341 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1342 };
1343
1344 static void ip6gre_destroy_tunnels(struct ip6gre_net *ign,
1345 struct list_head *head)
1346 {
1347 int prio;
1348
1349 for (prio = 0; prio < 4; prio++) {
1350 int h;
1351 for (h = 0; h < HASH_SIZE; h++) {
1352 struct ip6_tnl *t;
1353
1354 t = rtnl_dereference(ign->tunnels[prio][h]);
1355
1356 while (t != NULL) {
1357 unregister_netdevice_queue(t->dev, head);
1358 t = rtnl_dereference(t->next);
1359 }
1360 }
1361 }
1362 }
1363
1364 static int __net_init ip6gre_init_net(struct net *net)
1365 {
1366 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1367 int err;
1368
1369 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1370 ip6gre_tunnel_setup);
1371 if (!ign->fb_tunnel_dev) {
1372 err = -ENOMEM;
1373 goto err_alloc_dev;
1374 }
1375 dev_net_set(ign->fb_tunnel_dev, net);
1376
1377 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1378 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1379
1380 err = register_netdev(ign->fb_tunnel_dev);
1381 if (err)
1382 goto err_reg_dev;
1383
1384 rcu_assign_pointer(ign->tunnels_wc[0],
1385 netdev_priv(ign->fb_tunnel_dev));
1386 return 0;
1387
1388 err_reg_dev:
1389 ip6gre_dev_free(ign->fb_tunnel_dev);
1390 err_alloc_dev:
1391 return err;
1392 }
1393
1394 static void __net_exit ip6gre_exit_net(struct net *net)
1395 {
1396 struct ip6gre_net *ign;
1397 LIST_HEAD(list);
1398
1399 ign = net_generic(net, ip6gre_net_id);
1400 rtnl_lock();
1401 ip6gre_destroy_tunnels(ign, &list);
1402 unregister_netdevice_many(&list);
1403 rtnl_unlock();
1404 }
1405
1406 static struct pernet_operations ip6gre_net_ops = {
1407 .init = ip6gre_init_net,
1408 .exit = ip6gre_exit_net,
1409 .id = &ip6gre_net_id,
1410 .size = sizeof(struct ip6gre_net),
1411 };
1412
1413 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
1414 {
1415 __be16 flags;
1416
1417 if (!data)
1418 return 0;
1419
1420 flags = 0;
1421 if (data[IFLA_GRE_IFLAGS])
1422 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1423 if (data[IFLA_GRE_OFLAGS])
1424 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1425 if (flags & (GRE_VERSION|GRE_ROUTING))
1426 return -EINVAL;
1427
1428 return 0;
1429 }
1430
1431 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
1432 {
1433 struct in6_addr daddr;
1434
1435 if (tb[IFLA_ADDRESS]) {
1436 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1437 return -EINVAL;
1438 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1439 return -EADDRNOTAVAIL;
1440 }
1441
1442 if (!data)
1443 goto out;
1444
1445 if (data[IFLA_GRE_REMOTE]) {
1446 nla_memcpy(&daddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1447 if (ipv6_addr_any(&daddr))
1448 return -EINVAL;
1449 }
1450
1451 out:
1452 return ip6gre_tunnel_validate(tb, data);
1453 }
1454
1455
1456 static void ip6gre_netlink_parms(struct nlattr *data[],
1457 struct __ip6_tnl_parm *parms)
1458 {
1459 memset(parms, 0, sizeof(*parms));
1460
1461 if (!data)
1462 return;
1463
1464 if (data[IFLA_GRE_LINK])
1465 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1466
1467 if (data[IFLA_GRE_IFLAGS])
1468 parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]);
1469
1470 if (data[IFLA_GRE_OFLAGS])
1471 parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]);
1472
1473 if (data[IFLA_GRE_IKEY])
1474 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1475
1476 if (data[IFLA_GRE_OKEY])
1477 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1478
1479 if (data[IFLA_GRE_LOCAL])
1480 nla_memcpy(&parms->laddr, data[IFLA_GRE_LOCAL], sizeof(struct in6_addr));
1481
1482 if (data[IFLA_GRE_REMOTE])
1483 nla_memcpy(&parms->raddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1484
1485 if (data[IFLA_GRE_TTL])
1486 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1487
1488 if (data[IFLA_GRE_ENCAP_LIMIT])
1489 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1490
1491 if (data[IFLA_GRE_FLOWINFO])
1492 parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]);
1493
1494 if (data[IFLA_GRE_FLAGS])
1495 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1496 }
1497
1498 static int ip6gre_tap_init(struct net_device *dev)
1499 {
1500 struct ip6_tnl *tunnel;
1501
1502 tunnel = netdev_priv(dev);
1503
1504 tunnel->dev = dev;
1505 strcpy(tunnel->parms.name, dev->name);
1506
1507 ip6gre_tnl_link_config(tunnel, 1);
1508
1509 dev->tstats = alloc_percpu(struct pcpu_tstats);
1510 if (!dev->tstats)
1511 return -ENOMEM;
1512
1513 return 0;
1514 }
1515
1516 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1517 .ndo_init = ip6gre_tap_init,
1518 .ndo_uninit = ip6gre_tunnel_uninit,
1519 .ndo_start_xmit = ip6gre_tunnel_xmit,
1520 .ndo_set_mac_address = eth_mac_addr,
1521 .ndo_validate_addr = eth_validate_addr,
1522 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1523 .ndo_get_stats64 = ip6gre_get_stats64,
1524 };
1525
1526 static void ip6gre_tap_setup(struct net_device *dev)
1527 {
1528
1529 ether_setup(dev);
1530
1531 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1532 dev->destructor = ip6gre_dev_free;
1533
1534 dev->iflink = 0;
1535 dev->features |= NETIF_F_NETNS_LOCAL;
1536 }
1537
1538 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1539 struct nlattr *tb[], struct nlattr *data[])
1540 {
1541 struct ip6_tnl *nt;
1542 struct net *net = dev_net(dev);
1543 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1544 int err;
1545
1546 nt = netdev_priv(dev);
1547 ip6gre_netlink_parms(data, &nt->parms);
1548
1549 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1550 return -EEXIST;
1551
1552 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1553 eth_hw_addr_random(dev);
1554
1555 nt->dev = dev;
1556 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1557
1558 /* Can use a lockless transmit, unless we generate output sequences */
1559 if (!(nt->parms.o_flags & GRE_SEQ))
1560 dev->features |= NETIF_F_LLTX;
1561
1562 err = register_netdevice(dev);
1563 if (err)
1564 goto out;
1565
1566 dev_hold(dev);
1567 ip6gre_tunnel_link(ign, nt);
1568
1569 out:
1570 return err;
1571 }
1572
1573 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1574 struct nlattr *data[])
1575 {
1576 struct ip6_tnl *t, *nt;
1577 struct net *net = dev_net(dev);
1578 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1579 struct __ip6_tnl_parm p;
1580
1581 if (dev == ign->fb_tunnel_dev)
1582 return -EINVAL;
1583
1584 nt = netdev_priv(dev);
1585 ip6gre_netlink_parms(data, &p);
1586
1587 t = ip6gre_tunnel_locate(net, &p, 0);
1588
1589 if (t) {
1590 if (t->dev != dev)
1591 return -EEXIST;
1592 } else {
1593 t = nt;
1594
1595 ip6gre_tunnel_unlink(ign, t);
1596 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1597 ip6gre_tunnel_link(ign, t);
1598 netdev_state_change(dev);
1599 }
1600
1601 return 0;
1602 }
1603
1604 static size_t ip6gre_get_size(const struct net_device *dev)
1605 {
1606 return
1607 /* IFLA_GRE_LINK */
1608 nla_total_size(4) +
1609 /* IFLA_GRE_IFLAGS */
1610 nla_total_size(2) +
1611 /* IFLA_GRE_OFLAGS */
1612 nla_total_size(2) +
1613 /* IFLA_GRE_IKEY */
1614 nla_total_size(4) +
1615 /* IFLA_GRE_OKEY */
1616 nla_total_size(4) +
1617 /* IFLA_GRE_LOCAL */
1618 nla_total_size(sizeof(struct in6_addr)) +
1619 /* IFLA_GRE_REMOTE */
1620 nla_total_size(sizeof(struct in6_addr)) +
1621 /* IFLA_GRE_TTL */
1622 nla_total_size(1) +
1623 /* IFLA_GRE_TOS */
1624 nla_total_size(1) +
1625 /* IFLA_GRE_ENCAP_LIMIT */
1626 nla_total_size(1) +
1627 /* IFLA_GRE_FLOWINFO */
1628 nla_total_size(4) +
1629 /* IFLA_GRE_FLAGS */
1630 nla_total_size(4) +
1631 0;
1632 }
1633
1634 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1635 {
1636 struct ip6_tnl *t = netdev_priv(dev);
1637 struct __ip6_tnl_parm *p = &t->parms;
1638
1639 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1640 nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) ||
1641 nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) ||
1642 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1643 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
1644 nla_put(skb, IFLA_GRE_LOCAL, sizeof(struct in6_addr), &p->laddr) ||
1645 nla_put(skb, IFLA_GRE_REMOTE, sizeof(struct in6_addr), &p->raddr) ||
1646 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1647 /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/
1648 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1649 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1650 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags))
1651 goto nla_put_failure;
1652 return 0;
1653
1654 nla_put_failure:
1655 return -EMSGSIZE;
1656 }
1657
1658 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1659 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1660 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1661 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1662 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1663 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1664 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1665 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1666 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1667 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1668 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1669 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1670 };
1671
1672 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1673 .kind = "ip6gre",
1674 .maxtype = IFLA_GRE_MAX,
1675 .policy = ip6gre_policy,
1676 .priv_size = sizeof(struct ip6_tnl),
1677 .setup = ip6gre_tunnel_setup,
1678 .validate = ip6gre_tunnel_validate,
1679 .newlink = ip6gre_newlink,
1680 .changelink = ip6gre_changelink,
1681 .get_size = ip6gre_get_size,
1682 .fill_info = ip6gre_fill_info,
1683 };
1684
1685 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1686 .kind = "ip6gretap",
1687 .maxtype = IFLA_GRE_MAX,
1688 .policy = ip6gre_policy,
1689 .priv_size = sizeof(struct ip6_tnl),
1690 .setup = ip6gre_tap_setup,
1691 .validate = ip6gre_tap_validate,
1692 .newlink = ip6gre_newlink,
1693 .changelink = ip6gre_changelink,
1694 .get_size = ip6gre_get_size,
1695 .fill_info = ip6gre_fill_info,
1696 };
1697
1698 /*
1699 * And now the modules code and kernel interface.
1700 */
1701
1702 static int __init ip6gre_init(void)
1703 {
1704 int err;
1705
1706 pr_info("GRE over IPv6 tunneling driver\n");
1707
1708 err = register_pernet_device(&ip6gre_net_ops);
1709 if (err < 0)
1710 return err;
1711
1712 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1713 if (err < 0) {
1714 pr_info("%s: can't add protocol\n", __func__);
1715 goto add_proto_failed;
1716 }
1717
1718 err = rtnl_link_register(&ip6gre_link_ops);
1719 if (err < 0)
1720 goto rtnl_link_failed;
1721
1722 err = rtnl_link_register(&ip6gre_tap_ops);
1723 if (err < 0)
1724 goto tap_ops_failed;
1725
1726 out:
1727 return err;
1728
1729 tap_ops_failed:
1730 rtnl_link_unregister(&ip6gre_link_ops);
1731 rtnl_link_failed:
1732 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1733 add_proto_failed:
1734 unregister_pernet_device(&ip6gre_net_ops);
1735 goto out;
1736 }
1737
1738 static void __exit ip6gre_fini(void)
1739 {
1740 rtnl_link_unregister(&ip6gre_tap_ops);
1741 rtnl_link_unregister(&ip6gre_link_ops);
1742 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1743 unregister_pernet_device(&ip6gre_net_ops);
1744 }
1745
1746 module_init(ip6gre_init);
1747 module_exit(ip6gre_fini);
1748 MODULE_LICENSE("GPL");
1749 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1750 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1751 MODULE_ALIAS_RTNL_LINK("ip6gre");
1752 MODULE_ALIAS_NETDEV("ip6gre0");
CJK support for tty framebuffer vt