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Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / ipv6 / ip6_gre.c
1 /*
2 * GRE over IPv6 protocol decoder.
3 *
4 * Authors: Dmitry Kozlov (xeb@mail.ru)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 */
12
13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15 #include <linux/capability.h>
16 #include <linux/module.h>
17 #include <linux/types.h>
18 #include <linux/kernel.h>
19 #include <linux/slab.h>
20 #include <linux/uaccess.h>
21 #include <linux/skbuff.h>
22 #include <linux/netdevice.h>
23 #include <linux/in.h>
24 #include <linux/tcp.h>
25 #include <linux/udp.h>
26 #include <linux/if_arp.h>
27 #include <linux/mroute.h>
28 #include <linux/init.h>
29 #include <linux/in6.h>
30 #include <linux/inetdevice.h>
31 #include <linux/igmp.h>
32 #include <linux/netfilter_ipv4.h>
33 #include <linux/etherdevice.h>
34 #include <linux/if_ether.h>
35 #include <linux/hash.h>
36 #include <linux/if_tunnel.h>
37 #include <linux/ip6_tunnel.h>
38
39 #include <net/sock.h>
40 #include <net/ip.h>
41 #include <net/ip_tunnels.h>
42 #include <net/icmp.h>
43 #include <net/protocol.h>
44 #include <net/addrconf.h>
45 #include <net/arp.h>
46 #include <net/checksum.h>
47 #include <net/dsfield.h>
48 #include <net/inet_ecn.h>
49 #include <net/xfrm.h>
50 #include <net/net_namespace.h>
51 #include <net/netns/generic.h>
52 #include <net/rtnetlink.h>
53
54 #include <net/ipv6.h>
55 #include <net/ip6_fib.h>
56 #include <net/ip6_route.h>
57 #include <net/ip6_tunnel.h>
58
59
60 static bool log_ecn_error = true;
61 module_param(log_ecn_error, bool, 0644);
62 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
63
64 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
65 #define IPV6_TCLASS_SHIFT 20
66
67 #define HASH_SIZE_SHIFT 5
68 #define HASH_SIZE (1 << HASH_SIZE_SHIFT)
69
70 static int ip6gre_net_id __read_mostly;
71 struct ip6gre_net {
72 struct ip6_tnl __rcu *tunnels[4][HASH_SIZE];
73
74 struct net_device *fb_tunnel_dev;
75 };
76
77 static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
78 static int ip6gre_tunnel_init(struct net_device *dev);
79 static void ip6gre_tunnel_setup(struct net_device *dev);
80 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
81 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
82
83 /* Tunnel hash table */
84
85 /*
86 4 hash tables:
87
88 3: (remote,local)
89 2: (remote,*)
90 1: (*,local)
91 0: (*,*)
92
93 We require exact key match i.e. if a key is present in packet
94 it will match only tunnel with the same key; if it is not present,
95 it will match only keyless tunnel.
96
97 All keysless packets, if not matched configured keyless tunnels
98 will match fallback tunnel.
99 */
100
101 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(HASH_SIZE - 1))
102 static u32 HASH_ADDR(const struct in6_addr *addr)
103 {
104 u32 hash = ipv6_addr_hash(addr);
105
106 return hash_32(hash, HASH_SIZE_SHIFT);
107 }
108
109 #define tunnels_r_l tunnels[3]
110 #define tunnels_r tunnels[2]
111 #define tunnels_l tunnels[1]
112 #define tunnels_wc tunnels[0]
113
114 /* Given src, dst and key, find appropriate for input tunnel. */
115
116 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
117 const struct in6_addr *remote, const struct in6_addr *local,
118 __be32 key, __be16 gre_proto)
119 {
120 struct net *net = dev_net(dev);
121 int link = dev->ifindex;
122 unsigned int h0 = HASH_ADDR(remote);
123 unsigned int h1 = HASH_KEY(key);
124 struct ip6_tnl *t, *cand = NULL;
125 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
126 int dev_type = (gre_proto == htons(ETH_P_TEB)) ?
127 ARPHRD_ETHER : ARPHRD_IP6GRE;
128 int score, cand_score = 4;
129
130 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
131 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
132 !ipv6_addr_equal(remote, &t->parms.raddr) ||
133 key != t->parms.i_key ||
134 !(t->dev->flags & IFF_UP))
135 continue;
136
137 if (t->dev->type != ARPHRD_IP6GRE &&
138 t->dev->type != dev_type)
139 continue;
140
141 score = 0;
142 if (t->parms.link != link)
143 score |= 1;
144 if (t->dev->type != dev_type)
145 score |= 2;
146 if (score == 0)
147 return t;
148
149 if (score < cand_score) {
150 cand = t;
151 cand_score = score;
152 }
153 }
154
155 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
156 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
157 key != t->parms.i_key ||
158 !(t->dev->flags & IFF_UP))
159 continue;
160
161 if (t->dev->type != ARPHRD_IP6GRE &&
162 t->dev->type != dev_type)
163 continue;
164
165 score = 0;
166 if (t->parms.link != link)
167 score |= 1;
168 if (t->dev->type != dev_type)
169 score |= 2;
170 if (score == 0)
171 return t;
172
173 if (score < cand_score) {
174 cand = t;
175 cand_score = score;
176 }
177 }
178
179 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
180 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
181 (!ipv6_addr_equal(local, &t->parms.raddr) ||
182 !ipv6_addr_is_multicast(local))) ||
183 key != t->parms.i_key ||
184 !(t->dev->flags & IFF_UP))
185 continue;
186
187 if (t->dev->type != ARPHRD_IP6GRE &&
188 t->dev->type != dev_type)
189 continue;
190
191 score = 0;
192 if (t->parms.link != link)
193 score |= 1;
194 if (t->dev->type != dev_type)
195 score |= 2;
196 if (score == 0)
197 return t;
198
199 if (score < cand_score) {
200 cand = t;
201 cand_score = score;
202 }
203 }
204
205 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
206 if (t->parms.i_key != key ||
207 !(t->dev->flags & IFF_UP))
208 continue;
209
210 if (t->dev->type != ARPHRD_IP6GRE &&
211 t->dev->type != dev_type)
212 continue;
213
214 score = 0;
215 if (t->parms.link != link)
216 score |= 1;
217 if (t->dev->type != dev_type)
218 score |= 2;
219 if (score == 0)
220 return t;
221
222 if (score < cand_score) {
223 cand = t;
224 cand_score = score;
225 }
226 }
227
228 if (cand != NULL)
229 return cand;
230
231 dev = ign->fb_tunnel_dev;
232 if (dev->flags & IFF_UP)
233 return netdev_priv(dev);
234
235 return NULL;
236 }
237
238 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
239 const struct __ip6_tnl_parm *p)
240 {
241 const struct in6_addr *remote = &p->raddr;
242 const struct in6_addr *local = &p->laddr;
243 unsigned int h = HASH_KEY(p->i_key);
244 int prio = 0;
245
246 if (!ipv6_addr_any(local))
247 prio |= 1;
248 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
249 prio |= 2;
250 h ^= HASH_ADDR(remote);
251 }
252
253 return &ign->tunnels[prio][h];
254 }
255
256 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
257 const struct ip6_tnl *t)
258 {
259 return __ip6gre_bucket(ign, &t->parms);
260 }
261
262 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
263 {
264 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
265
266 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
267 rcu_assign_pointer(*tp, t);
268 }
269
270 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
271 {
272 struct ip6_tnl __rcu **tp;
273 struct ip6_tnl *iter;
274
275 for (tp = ip6gre_bucket(ign, t);
276 (iter = rtnl_dereference(*tp)) != NULL;
277 tp = &iter->next) {
278 if (t == iter) {
279 rcu_assign_pointer(*tp, t->next);
280 break;
281 }
282 }
283 }
284
285 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
286 const struct __ip6_tnl_parm *parms,
287 int type)
288 {
289 const struct in6_addr *remote = &parms->raddr;
290 const struct in6_addr *local = &parms->laddr;
291 __be32 key = parms->i_key;
292 int link = parms->link;
293 struct ip6_tnl *t;
294 struct ip6_tnl __rcu **tp;
295 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
296
297 for (tp = __ip6gre_bucket(ign, parms);
298 (t = rtnl_dereference(*tp)) != NULL;
299 tp = &t->next)
300 if (ipv6_addr_equal(local, &t->parms.laddr) &&
301 ipv6_addr_equal(remote, &t->parms.raddr) &&
302 key == t->parms.i_key &&
303 link == t->parms.link &&
304 type == t->dev->type)
305 break;
306
307 return t;
308 }
309
310 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
311 const struct __ip6_tnl_parm *parms, int create)
312 {
313 struct ip6_tnl *t, *nt;
314 struct net_device *dev;
315 char name[IFNAMSIZ];
316 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
317
318 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
319 if (t || !create)
320 return t;
321
322 if (parms->name[0])
323 strlcpy(name, parms->name, IFNAMSIZ);
324 else
325 strcpy(name, "ip6gre%d");
326
327 dev = alloc_netdev(sizeof(*t), name, ip6gre_tunnel_setup);
328 if (!dev)
329 return NULL;
330
331 dev_net_set(dev, net);
332
333 nt = netdev_priv(dev);
334 nt->parms = *parms;
335 dev->rtnl_link_ops = &ip6gre_link_ops;
336
337 nt->dev = dev;
338 ip6gre_tnl_link_config(nt, 1);
339
340 if (register_netdevice(dev) < 0)
341 goto failed_free;
342
343 /* Can use a lockless transmit, unless we generate output sequences */
344 if (!(nt->parms.o_flags & GRE_SEQ))
345 dev->features |= NETIF_F_LLTX;
346
347 dev_hold(dev);
348 ip6gre_tunnel_link(ign, nt);
349 return nt;
350
351 failed_free:
352 free_netdev(dev);
353 return NULL;
354 }
355
356 static void ip6gre_tunnel_uninit(struct net_device *dev)
357 {
358 struct net *net = dev_net(dev);
359 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
360
361 ip6gre_tunnel_unlink(ign, netdev_priv(dev));
362 dev_put(dev);
363 }
364
365
366 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
367 u8 type, u8 code, int offset, __be32 info)
368 {
369 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
370 __be16 *p = (__be16 *)(skb->data + offset);
371 int grehlen = offset + 4;
372 struct ip6_tnl *t;
373 __be16 flags;
374
375 flags = p[0];
376 if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) {
377 if (flags&(GRE_VERSION|GRE_ROUTING))
378 return;
379 if (flags&GRE_KEY) {
380 grehlen += 4;
381 if (flags&GRE_CSUM)
382 grehlen += 4;
383 }
384 }
385
386 /* If only 8 bytes returned, keyed message will be dropped here */
387 if (!pskb_may_pull(skb, grehlen))
388 return;
389 ipv6h = (const struct ipv6hdr *)skb->data;
390 p = (__be16 *)(skb->data + offset);
391
392 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
393 flags & GRE_KEY ?
394 *(((__be32 *)p) + (grehlen / 4) - 1) : 0,
395 p[1]);
396 if (t == NULL)
397 return;
398
399 switch (type) {
400 __u32 teli;
401 struct ipv6_tlv_tnl_enc_lim *tel;
402 __u32 mtu;
403 case ICMPV6_DEST_UNREACH:
404 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
405 t->parms.name);
406 break;
407 case ICMPV6_TIME_EXCEED:
408 if (code == ICMPV6_EXC_HOPLIMIT) {
409 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
410 t->parms.name);
411 }
412 break;
413 case ICMPV6_PARAMPROB:
414 teli = 0;
415 if (code == ICMPV6_HDR_FIELD)
416 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
417
418 if (teli && teli == info - 2) {
419 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
420 if (tel->encap_limit == 0) {
421 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
422 t->parms.name);
423 }
424 } else {
425 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
426 t->parms.name);
427 }
428 break;
429 case ICMPV6_PKT_TOOBIG:
430 mtu = info - offset;
431 if (mtu < IPV6_MIN_MTU)
432 mtu = IPV6_MIN_MTU;
433 t->dev->mtu = mtu;
434 break;
435 }
436
437 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
438 t->err_count++;
439 else
440 t->err_count = 1;
441 t->err_time = jiffies;
442 }
443
444 static int ip6gre_rcv(struct sk_buff *skb)
445 {
446 const struct ipv6hdr *ipv6h;
447 u8 *h;
448 __be16 flags;
449 __sum16 csum = 0;
450 __be32 key = 0;
451 u32 seqno = 0;
452 struct ip6_tnl *tunnel;
453 int offset = 4;
454 __be16 gre_proto;
455 int err;
456
457 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
458 goto drop;
459
460 ipv6h = ipv6_hdr(skb);
461 h = skb->data;
462 flags = *(__be16 *)h;
463
464 if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) {
465 /* - Version must be 0.
466 - We do not support routing headers.
467 */
468 if (flags&(GRE_VERSION|GRE_ROUTING))
469 goto drop;
470
471 if (flags&GRE_CSUM) {
472 switch (skb->ip_summed) {
473 case CHECKSUM_COMPLETE:
474 csum = csum_fold(skb->csum);
475 if (!csum)
476 break;
477 /* fall through */
478 case CHECKSUM_NONE:
479 skb->csum = 0;
480 csum = __skb_checksum_complete(skb);
481 skb->ip_summed = CHECKSUM_COMPLETE;
482 }
483 offset += 4;
484 }
485 if (flags&GRE_KEY) {
486 key = *(__be32 *)(h + offset);
487 offset += 4;
488 }
489 if (flags&GRE_SEQ) {
490 seqno = ntohl(*(__be32 *)(h + offset));
491 offset += 4;
492 }
493 }
494
495 gre_proto = *(__be16 *)(h + 2);
496
497 tunnel = ip6gre_tunnel_lookup(skb->dev,
498 &ipv6h->saddr, &ipv6h->daddr, key,
499 gre_proto);
500 if (tunnel) {
501 struct pcpu_tstats *tstats;
502
503 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
504 goto drop;
505
506 if (!ip6_tnl_rcv_ctl(tunnel, &ipv6h->daddr, &ipv6h->saddr)) {
507 tunnel->dev->stats.rx_dropped++;
508 goto drop;
509 }
510
511 secpath_reset(skb);
512
513 skb->protocol = gre_proto;
514 /* WCCP version 1 and 2 protocol decoding.
515 * - Change protocol to IP
516 * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
517 */
518 if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) {
519 skb->protocol = htons(ETH_P_IP);
520 if ((*(h + offset) & 0xF0) != 0x40)
521 offset += 4;
522 }
523
524 skb->mac_header = skb->network_header;
525 __pskb_pull(skb, offset);
526 skb_postpull_rcsum(skb, skb_transport_header(skb), offset);
527 skb->pkt_type = PACKET_HOST;
528
529 if (((flags&GRE_CSUM) && csum) ||
530 (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) {
531 tunnel->dev->stats.rx_crc_errors++;
532 tunnel->dev->stats.rx_errors++;
533 goto drop;
534 }
535 if (tunnel->parms.i_flags&GRE_SEQ) {
536 if (!(flags&GRE_SEQ) ||
537 (tunnel->i_seqno &&
538 (s32)(seqno - tunnel->i_seqno) < 0)) {
539 tunnel->dev->stats.rx_fifo_errors++;
540 tunnel->dev->stats.rx_errors++;
541 goto drop;
542 }
543 tunnel->i_seqno = seqno + 1;
544 }
545
546 /* Warning: All skb pointers will be invalidated! */
547 if (tunnel->dev->type == ARPHRD_ETHER) {
548 if (!pskb_may_pull(skb, ETH_HLEN)) {
549 tunnel->dev->stats.rx_length_errors++;
550 tunnel->dev->stats.rx_errors++;
551 goto drop;
552 }
553
554 ipv6h = ipv6_hdr(skb);
555 skb->protocol = eth_type_trans(skb, tunnel->dev);
556 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
557 }
558
559 __skb_tunnel_rx(skb, tunnel->dev);
560
561 skb_reset_network_header(skb);
562
563 err = IP6_ECN_decapsulate(ipv6h, skb);
564 if (unlikely(err)) {
565 if (log_ecn_error)
566 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
567 &ipv6h->saddr,
568 ipv6_get_dsfield(ipv6h));
569 if (err > 1) {
570 ++tunnel->dev->stats.rx_frame_errors;
571 ++tunnel->dev->stats.rx_errors;
572 goto drop;
573 }
574 }
575
576 tstats = this_cpu_ptr(tunnel->dev->tstats);
577 u64_stats_update_begin(&tstats->syncp);
578 tstats->rx_packets++;
579 tstats->rx_bytes += skb->len;
580 u64_stats_update_end(&tstats->syncp);
581
582 netif_rx(skb);
583
584 return 0;
585 }
586 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
587
588 drop:
589 kfree_skb(skb);
590 return 0;
591 }
592
593 struct ipv6_tel_txoption {
594 struct ipv6_txoptions ops;
595 __u8 dst_opt[8];
596 };
597
598 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
599 {
600 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
601
602 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
603 opt->dst_opt[3] = 1;
604 opt->dst_opt[4] = encap_limit;
605 opt->dst_opt[5] = IPV6_TLV_PADN;
606 opt->dst_opt[6] = 1;
607
608 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
609 opt->ops.opt_nflen = 8;
610 }
611
612 static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
613 struct net_device *dev,
614 __u8 dsfield,
615 struct flowi6 *fl6,
616 int encap_limit,
617 __u32 *pmtu)
618 {
619 struct net *net = dev_net(dev);
620 struct ip6_tnl *tunnel = netdev_priv(dev);
621 struct net_device *tdev; /* Device to other host */
622 struct ipv6hdr *ipv6h; /* Our new IP header */
623 unsigned int max_headroom; /* The extra header space needed */
624 int gre_hlen;
625 struct ipv6_tel_txoption opt;
626 int mtu;
627 struct dst_entry *dst = NULL, *ndst = NULL;
628 struct net_device_stats *stats = &tunnel->dev->stats;
629 int err = -1;
630 u8 proto;
631 struct sk_buff *new_skb;
632
633 if (dev->type == ARPHRD_ETHER)
634 IPCB(skb)->flags = 0;
635
636 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) {
637 gre_hlen = 0;
638 ipv6h = (struct ipv6hdr *)skb->data;
639 fl6->daddr = ipv6h->daddr;
640 } else {
641 gre_hlen = tunnel->hlen;
642 fl6->daddr = tunnel->parms.raddr;
643 }
644
645 if (!fl6->flowi6_mark)
646 dst = ip6_tnl_dst_check(tunnel);
647
648 if (!dst) {
649 ndst = ip6_route_output(net, NULL, fl6);
650
651 if (ndst->error)
652 goto tx_err_link_failure;
653 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
654 if (IS_ERR(ndst)) {
655 err = PTR_ERR(ndst);
656 ndst = NULL;
657 goto tx_err_link_failure;
658 }
659 dst = ndst;
660 }
661
662 tdev = dst->dev;
663
664 if (tdev == dev) {
665 stats->collisions++;
666 net_warn_ratelimited("%s: Local routing loop detected!\n",
667 tunnel->parms.name);
668 goto tx_err_dst_release;
669 }
670
671 mtu = dst_mtu(dst) - sizeof(*ipv6h);
672 if (encap_limit >= 0) {
673 max_headroom += 8;
674 mtu -= 8;
675 }
676 if (mtu < IPV6_MIN_MTU)
677 mtu = IPV6_MIN_MTU;
678 if (skb_dst(skb))
679 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
680 if (skb->len > mtu) {
681 *pmtu = mtu;
682 err = -EMSGSIZE;
683 goto tx_err_dst_release;
684 }
685
686 if (tunnel->err_count > 0) {
687 if (time_before(jiffies,
688 tunnel->err_time + IP6TUNNEL_ERR_TIMEO)) {
689 tunnel->err_count--;
690
691 dst_link_failure(skb);
692 } else
693 tunnel->err_count = 0;
694 }
695
696 max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len;
697
698 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
699 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
700 new_skb = skb_realloc_headroom(skb, max_headroom);
701 if (max_headroom > dev->needed_headroom)
702 dev->needed_headroom = max_headroom;
703 if (!new_skb)
704 goto tx_err_dst_release;
705
706 if (skb->sk)
707 skb_set_owner_w(new_skb, skb->sk);
708 consume_skb(skb);
709 skb = new_skb;
710 }
711
712 skb_dst_drop(skb);
713
714 if (fl6->flowi6_mark) {
715 skb_dst_set(skb, dst);
716 ndst = NULL;
717 } else {
718 skb_dst_set_noref(skb, dst);
719 }
720
721 proto = NEXTHDR_GRE;
722 if (encap_limit >= 0) {
723 init_tel_txopt(&opt, encap_limit);
724 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
725 }
726
727 skb_push(skb, gre_hlen);
728 skb_reset_network_header(skb);
729 skb_set_transport_header(skb, sizeof(*ipv6h));
730
731 /*
732 * Push down and install the IP header.
733 */
734 ipv6h = ipv6_hdr(skb);
735 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), fl6->flowlabel);
736 ipv6h->hop_limit = tunnel->parms.hop_limit;
737 ipv6h->nexthdr = proto;
738 ipv6h->saddr = fl6->saddr;
739 ipv6h->daddr = fl6->daddr;
740
741 ((__be16 *)(ipv6h + 1))[0] = tunnel->parms.o_flags;
742 ((__be16 *)(ipv6h + 1))[1] = (dev->type == ARPHRD_ETHER) ?
743 htons(ETH_P_TEB) : skb->protocol;
744
745 if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) {
746 __be32 *ptr = (__be32 *)(((u8 *)ipv6h) + tunnel->hlen - 4);
747
748 if (tunnel->parms.o_flags&GRE_SEQ) {
749 ++tunnel->o_seqno;
750 *ptr = htonl(tunnel->o_seqno);
751 ptr--;
752 }
753 if (tunnel->parms.o_flags&GRE_KEY) {
754 *ptr = tunnel->parms.o_key;
755 ptr--;
756 }
757 if (tunnel->parms.o_flags&GRE_CSUM) {
758 *ptr = 0;
759 *(__sum16 *)ptr = ip_compute_csum((void *)(ipv6h+1),
760 skb->len - sizeof(struct ipv6hdr));
761 }
762 }
763
764 ip6tunnel_xmit(skb, dev);
765 if (ndst)
766 ip6_tnl_dst_store(tunnel, ndst);
767 return 0;
768 tx_err_link_failure:
769 stats->tx_carrier_errors++;
770 dst_link_failure(skb);
771 tx_err_dst_release:
772 dst_release(ndst);
773 return err;
774 }
775
776 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
777 {
778 struct ip6_tnl *t = netdev_priv(dev);
779 const struct iphdr *iph = ip_hdr(skb);
780 int encap_limit = -1;
781 struct flowi6 fl6;
782 __u8 dsfield;
783 __u32 mtu;
784 int err;
785
786 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
787 encap_limit = t->parms.encap_limit;
788
789 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
790 fl6.flowi6_proto = IPPROTO_IPIP;
791
792 dsfield = ipv4_get_dsfield(iph);
793
794 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
795 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
796 & IPV6_TCLASS_MASK;
797 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
798 fl6.flowi6_mark = skb->mark;
799
800 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
801 if (err != 0) {
802 /* XXX: send ICMP error even if DF is not set. */
803 if (err == -EMSGSIZE)
804 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
805 htonl(mtu));
806 return -1;
807 }
808
809 return 0;
810 }
811
812 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
813 {
814 struct ip6_tnl *t = netdev_priv(dev);
815 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
816 int encap_limit = -1;
817 __u16 offset;
818 struct flowi6 fl6;
819 __u8 dsfield;
820 __u32 mtu;
821 int err;
822
823 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
824 return -1;
825
826 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
827 if (offset > 0) {
828 struct ipv6_tlv_tnl_enc_lim *tel;
829 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
830 if (tel->encap_limit == 0) {
831 icmpv6_send(skb, ICMPV6_PARAMPROB,
832 ICMPV6_HDR_FIELD, offset + 2);
833 return -1;
834 }
835 encap_limit = tel->encap_limit - 1;
836 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
837 encap_limit = t->parms.encap_limit;
838
839 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
840 fl6.flowi6_proto = IPPROTO_IPV6;
841
842 dsfield = ipv6_get_dsfield(ipv6h);
843 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
844 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
845 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
846 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK);
847 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
848 fl6.flowi6_mark = skb->mark;
849
850 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
851 if (err != 0) {
852 if (err == -EMSGSIZE)
853 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
854 return -1;
855 }
856
857 return 0;
858 }
859
860 /**
861 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
862 * @t: the outgoing tunnel device
863 * @hdr: IPv6 header from the incoming packet
864 *
865 * Description:
866 * Avoid trivial tunneling loop by checking that tunnel exit-point
867 * doesn't match source of incoming packet.
868 *
869 * Return:
870 * 1 if conflict,
871 * 0 else
872 **/
873
874 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
875 const struct ipv6hdr *hdr)
876 {
877 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
878 }
879
880 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
881 {
882 struct ip6_tnl *t = netdev_priv(dev);
883 int encap_limit = -1;
884 struct flowi6 fl6;
885 __u32 mtu;
886 int err;
887
888 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
889 encap_limit = t->parms.encap_limit;
890
891 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
892 fl6.flowi6_proto = skb->protocol;
893
894 err = ip6gre_xmit2(skb, dev, 0, &fl6, encap_limit, &mtu);
895
896 return err;
897 }
898
899 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
900 struct net_device *dev)
901 {
902 struct ip6_tnl *t = netdev_priv(dev);
903 struct net_device_stats *stats = &t->dev->stats;
904 int ret;
905
906 if (!ip6_tnl_xmit_ctl(t))
907 goto tx_err;
908
909 switch (skb->protocol) {
910 case htons(ETH_P_IP):
911 ret = ip6gre_xmit_ipv4(skb, dev);
912 break;
913 case htons(ETH_P_IPV6):
914 ret = ip6gre_xmit_ipv6(skb, dev);
915 break;
916 default:
917 ret = ip6gre_xmit_other(skb, dev);
918 break;
919 }
920
921 if (ret < 0)
922 goto tx_err;
923
924 return NETDEV_TX_OK;
925
926 tx_err:
927 stats->tx_errors++;
928 stats->tx_dropped++;
929 kfree_skb(skb);
930 return NETDEV_TX_OK;
931 }
932
933 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
934 {
935 struct net_device *dev = t->dev;
936 struct __ip6_tnl_parm *p = &t->parms;
937 struct flowi6 *fl6 = &t->fl.u.ip6;
938 int addend = sizeof(struct ipv6hdr) + 4;
939
940 if (dev->type != ARPHRD_ETHER) {
941 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
942 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
943 }
944
945 /* Set up flowi template */
946 fl6->saddr = p->laddr;
947 fl6->daddr = p->raddr;
948 fl6->flowi6_oif = p->link;
949 fl6->flowlabel = 0;
950
951 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
952 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
953 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
954 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
955
956 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
957 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
958
959 if (p->flags&IP6_TNL_F_CAP_XMIT &&
960 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
961 dev->flags |= IFF_POINTOPOINT;
962 else
963 dev->flags &= ~IFF_POINTOPOINT;
964
965 dev->iflink = p->link;
966
967 /* Precalculate GRE options length */
968 if (t->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) {
969 if (t->parms.o_flags&GRE_CSUM)
970 addend += 4;
971 if (t->parms.o_flags&GRE_KEY)
972 addend += 4;
973 if (t->parms.o_flags&GRE_SEQ)
974 addend += 4;
975 }
976
977 if (p->flags & IP6_TNL_F_CAP_XMIT) {
978 int strict = (ipv6_addr_type(&p->raddr) &
979 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
980
981 struct rt6_info *rt = rt6_lookup(dev_net(dev),
982 &p->raddr, &p->laddr,
983 p->link, strict);
984
985 if (rt == NULL)
986 return;
987
988 if (rt->dst.dev) {
989 dev->hard_header_len = rt->dst.dev->hard_header_len + addend;
990
991 if (set_mtu) {
992 dev->mtu = rt->dst.dev->mtu - addend;
993 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
994 dev->mtu -= 8;
995
996 if (dev->mtu < IPV6_MIN_MTU)
997 dev->mtu = IPV6_MIN_MTU;
998 }
999 }
1000 ip6_rt_put(rt);
1001 }
1002
1003 t->hlen = addend;
1004 }
1005
1006 static int ip6gre_tnl_change(struct ip6_tnl *t,
1007 const struct __ip6_tnl_parm *p, int set_mtu)
1008 {
1009 t->parms.laddr = p->laddr;
1010 t->parms.raddr = p->raddr;
1011 t->parms.flags = p->flags;
1012 t->parms.hop_limit = p->hop_limit;
1013 t->parms.encap_limit = p->encap_limit;
1014 t->parms.flowinfo = p->flowinfo;
1015 t->parms.link = p->link;
1016 t->parms.proto = p->proto;
1017 t->parms.i_key = p->i_key;
1018 t->parms.o_key = p->o_key;
1019 t->parms.i_flags = p->i_flags;
1020 t->parms.o_flags = p->o_flags;
1021 ip6_tnl_dst_reset(t);
1022 ip6gre_tnl_link_config(t, set_mtu);
1023 return 0;
1024 }
1025
1026 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1027 const struct ip6_tnl_parm2 *u)
1028 {
1029 p->laddr = u->laddr;
1030 p->raddr = u->raddr;
1031 p->flags = u->flags;
1032 p->hop_limit = u->hop_limit;
1033 p->encap_limit = u->encap_limit;
1034 p->flowinfo = u->flowinfo;
1035 p->link = u->link;
1036 p->i_key = u->i_key;
1037 p->o_key = u->o_key;
1038 p->i_flags = u->i_flags;
1039 p->o_flags = u->o_flags;
1040 memcpy(p->name, u->name, sizeof(u->name));
1041 }
1042
1043 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1044 const struct __ip6_tnl_parm *p)
1045 {
1046 u->proto = IPPROTO_GRE;
1047 u->laddr = p->laddr;
1048 u->raddr = p->raddr;
1049 u->flags = p->flags;
1050 u->hop_limit = p->hop_limit;
1051 u->encap_limit = p->encap_limit;
1052 u->flowinfo = p->flowinfo;
1053 u->link = p->link;
1054 u->i_key = p->i_key;
1055 u->o_key = p->o_key;
1056 u->i_flags = p->i_flags;
1057 u->o_flags = p->o_flags;
1058 memcpy(u->name, p->name, sizeof(u->name));
1059 }
1060
1061 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1062 struct ifreq *ifr, int cmd)
1063 {
1064 int err = 0;
1065 struct ip6_tnl_parm2 p;
1066 struct __ip6_tnl_parm p1;
1067 struct ip6_tnl *t;
1068 struct net *net = dev_net(dev);
1069 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1070
1071 switch (cmd) {
1072 case SIOCGETTUNNEL:
1073 t = NULL;
1074 if (dev == ign->fb_tunnel_dev) {
1075 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1076 err = -EFAULT;
1077 break;
1078 }
1079 ip6gre_tnl_parm_from_user(&p1, &p);
1080 t = ip6gre_tunnel_locate(net, &p1, 0);
1081 }
1082 if (t == NULL)
1083 t = netdev_priv(dev);
1084 memset(&p, 0, sizeof(p));
1085 ip6gre_tnl_parm_to_user(&p, &t->parms);
1086 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1087 err = -EFAULT;
1088 break;
1089
1090 case SIOCADDTUNNEL:
1091 case SIOCCHGTUNNEL:
1092 err = -EPERM;
1093 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1094 goto done;
1095
1096 err = -EFAULT;
1097 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1098 goto done;
1099
1100 err = -EINVAL;
1101 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1102 goto done;
1103
1104 if (!(p.i_flags&GRE_KEY))
1105 p.i_key = 0;
1106 if (!(p.o_flags&GRE_KEY))
1107 p.o_key = 0;
1108
1109 ip6gre_tnl_parm_from_user(&p1, &p);
1110 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1111
1112 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1113 if (t != NULL) {
1114 if (t->dev != dev) {
1115 err = -EEXIST;
1116 break;
1117 }
1118 } else {
1119 t = netdev_priv(dev);
1120
1121 ip6gre_tunnel_unlink(ign, t);
1122 synchronize_net();
1123 ip6gre_tnl_change(t, &p1, 1);
1124 ip6gre_tunnel_link(ign, t);
1125 netdev_state_change(dev);
1126 }
1127 }
1128
1129 if (t) {
1130 err = 0;
1131
1132 memset(&p, 0, sizeof(p));
1133 ip6gre_tnl_parm_to_user(&p, &t->parms);
1134 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1135 err = -EFAULT;
1136 } else
1137 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1138 break;
1139
1140 case SIOCDELTUNNEL:
1141 err = -EPERM;
1142 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1143 goto done;
1144
1145 if (dev == ign->fb_tunnel_dev) {
1146 err = -EFAULT;
1147 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1148 goto done;
1149 err = -ENOENT;
1150 ip6gre_tnl_parm_from_user(&p1, &p);
1151 t = ip6gre_tunnel_locate(net, &p1, 0);
1152 if (t == NULL)
1153 goto done;
1154 err = -EPERM;
1155 if (t == netdev_priv(ign->fb_tunnel_dev))
1156 goto done;
1157 dev = t->dev;
1158 }
1159 unregister_netdevice(dev);
1160 err = 0;
1161 break;
1162
1163 default:
1164 err = -EINVAL;
1165 }
1166
1167 done:
1168 return err;
1169 }
1170
1171 static int ip6gre_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1172 {
1173 struct ip6_tnl *tunnel = netdev_priv(dev);
1174 if (new_mtu < 68 ||
1175 new_mtu > 0xFFF8 - dev->hard_header_len - tunnel->hlen)
1176 return -EINVAL;
1177 dev->mtu = new_mtu;
1178 return 0;
1179 }
1180
1181 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1182 unsigned short type,
1183 const void *daddr, const void *saddr, unsigned int len)
1184 {
1185 struct ip6_tnl *t = netdev_priv(dev);
1186 struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen);
1187 __be16 *p = (__be16 *)(ipv6h+1);
1188
1189 ip6_flow_hdr(ipv6h, 0, t->fl.u.ip6.flowlabel);
1190 ipv6h->hop_limit = t->parms.hop_limit;
1191 ipv6h->nexthdr = NEXTHDR_GRE;
1192 ipv6h->saddr = t->parms.laddr;
1193 ipv6h->daddr = t->parms.raddr;
1194
1195 p[0] = t->parms.o_flags;
1196 p[1] = htons(type);
1197
1198 /*
1199 * Set the source hardware address.
1200 */
1201
1202 if (saddr)
1203 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1204 if (daddr)
1205 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1206 if (!ipv6_addr_any(&ipv6h->daddr))
1207 return t->hlen;
1208
1209 return -t->hlen;
1210 }
1211
1212 static const struct header_ops ip6gre_header_ops = {
1213 .create = ip6gre_header,
1214 };
1215
1216 static const struct net_device_ops ip6gre_netdev_ops = {
1217 .ndo_init = ip6gre_tunnel_init,
1218 .ndo_uninit = ip6gre_tunnel_uninit,
1219 .ndo_start_xmit = ip6gre_tunnel_xmit,
1220 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1221 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1222 .ndo_get_stats64 = ip_tunnel_get_stats64,
1223 };
1224
1225 static void ip6gre_dev_free(struct net_device *dev)
1226 {
1227 free_percpu(dev->tstats);
1228 free_netdev(dev);
1229 }
1230
1231 static void ip6gre_tunnel_setup(struct net_device *dev)
1232 {
1233 struct ip6_tnl *t;
1234
1235 dev->netdev_ops = &ip6gre_netdev_ops;
1236 dev->destructor = ip6gre_dev_free;
1237
1238 dev->type = ARPHRD_IP6GRE;
1239 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr) + 4;
1240 dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr) - 4;
1241 t = netdev_priv(dev);
1242 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1243 dev->mtu -= 8;
1244 dev->flags |= IFF_NOARP;
1245 dev->iflink = 0;
1246 dev->addr_len = sizeof(struct in6_addr);
1247 dev->features |= NETIF_F_NETNS_LOCAL;
1248 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1249 }
1250
1251 static int ip6gre_tunnel_init(struct net_device *dev)
1252 {
1253 struct ip6_tnl *tunnel;
1254
1255 tunnel = netdev_priv(dev);
1256
1257 tunnel->dev = dev;
1258 strcpy(tunnel->parms.name, dev->name);
1259
1260 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1261 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1262
1263 if (ipv6_addr_any(&tunnel->parms.raddr))
1264 dev->header_ops = &ip6gre_header_ops;
1265
1266 dev->tstats = alloc_percpu(struct pcpu_tstats);
1267 if (!dev->tstats)
1268 return -ENOMEM;
1269
1270 return 0;
1271 }
1272
1273 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1274 {
1275 struct ip6_tnl *tunnel = netdev_priv(dev);
1276
1277 tunnel->dev = dev;
1278 strcpy(tunnel->parms.name, dev->name);
1279
1280 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1281
1282 dev_hold(dev);
1283 }
1284
1285
1286 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1287 .handler = ip6gre_rcv,
1288 .err_handler = ip6gre_err,
1289 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1290 };
1291
1292 static void ip6gre_destroy_tunnels(struct ip6gre_net *ign,
1293 struct list_head *head)
1294 {
1295 int prio;
1296
1297 for (prio = 0; prio < 4; prio++) {
1298 int h;
1299 for (h = 0; h < HASH_SIZE; h++) {
1300 struct ip6_tnl *t;
1301
1302 t = rtnl_dereference(ign->tunnels[prio][h]);
1303
1304 while (t != NULL) {
1305 unregister_netdevice_queue(t->dev, head);
1306 t = rtnl_dereference(t->next);
1307 }
1308 }
1309 }
1310 }
1311
1312 static int __net_init ip6gre_init_net(struct net *net)
1313 {
1314 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1315 int err;
1316
1317 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1318 ip6gre_tunnel_setup);
1319 if (!ign->fb_tunnel_dev) {
1320 err = -ENOMEM;
1321 goto err_alloc_dev;
1322 }
1323 dev_net_set(ign->fb_tunnel_dev, net);
1324
1325 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1326 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1327
1328 err = register_netdev(ign->fb_tunnel_dev);
1329 if (err)
1330 goto err_reg_dev;
1331
1332 rcu_assign_pointer(ign->tunnels_wc[0],
1333 netdev_priv(ign->fb_tunnel_dev));
1334 return 0;
1335
1336 err_reg_dev:
1337 ip6gre_dev_free(ign->fb_tunnel_dev);
1338 err_alloc_dev:
1339 return err;
1340 }
1341
1342 static void __net_exit ip6gre_exit_net(struct net *net)
1343 {
1344 struct ip6gre_net *ign;
1345 LIST_HEAD(list);
1346
1347 ign = net_generic(net, ip6gre_net_id);
1348 rtnl_lock();
1349 ip6gre_destroy_tunnels(ign, &list);
1350 unregister_netdevice_many(&list);
1351 rtnl_unlock();
1352 }
1353
1354 static struct pernet_operations ip6gre_net_ops = {
1355 .init = ip6gre_init_net,
1356 .exit = ip6gre_exit_net,
1357 .id = &ip6gre_net_id,
1358 .size = sizeof(struct ip6gre_net),
1359 };
1360
1361 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
1362 {
1363 __be16 flags;
1364
1365 if (!data)
1366 return 0;
1367
1368 flags = 0;
1369 if (data[IFLA_GRE_IFLAGS])
1370 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1371 if (data[IFLA_GRE_OFLAGS])
1372 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1373 if (flags & (GRE_VERSION|GRE_ROUTING))
1374 return -EINVAL;
1375
1376 return 0;
1377 }
1378
1379 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
1380 {
1381 struct in6_addr daddr;
1382
1383 if (tb[IFLA_ADDRESS]) {
1384 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1385 return -EINVAL;
1386 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1387 return -EADDRNOTAVAIL;
1388 }
1389
1390 if (!data)
1391 goto out;
1392
1393 if (data[IFLA_GRE_REMOTE]) {
1394 nla_memcpy(&daddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1395 if (ipv6_addr_any(&daddr))
1396 return -EINVAL;
1397 }
1398
1399 out:
1400 return ip6gre_tunnel_validate(tb, data);
1401 }
1402
1403
1404 static void ip6gre_netlink_parms(struct nlattr *data[],
1405 struct __ip6_tnl_parm *parms)
1406 {
1407 memset(parms, 0, sizeof(*parms));
1408
1409 if (!data)
1410 return;
1411
1412 if (data[IFLA_GRE_LINK])
1413 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1414
1415 if (data[IFLA_GRE_IFLAGS])
1416 parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]);
1417
1418 if (data[IFLA_GRE_OFLAGS])
1419 parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]);
1420
1421 if (data[IFLA_GRE_IKEY])
1422 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1423
1424 if (data[IFLA_GRE_OKEY])
1425 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1426
1427 if (data[IFLA_GRE_LOCAL])
1428 nla_memcpy(&parms->laddr, data[IFLA_GRE_LOCAL], sizeof(struct in6_addr));
1429
1430 if (data[IFLA_GRE_REMOTE])
1431 nla_memcpy(&parms->raddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1432
1433 if (data[IFLA_GRE_TTL])
1434 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1435
1436 if (data[IFLA_GRE_ENCAP_LIMIT])
1437 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1438
1439 if (data[IFLA_GRE_FLOWINFO])
1440 parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]);
1441
1442 if (data[IFLA_GRE_FLAGS])
1443 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1444 }
1445
1446 static int ip6gre_tap_init(struct net_device *dev)
1447 {
1448 struct ip6_tnl *tunnel;
1449
1450 tunnel = netdev_priv(dev);
1451
1452 tunnel->dev = dev;
1453 strcpy(tunnel->parms.name, dev->name);
1454
1455 ip6gre_tnl_link_config(tunnel, 1);
1456
1457 dev->tstats = alloc_percpu(struct pcpu_tstats);
1458 if (!dev->tstats)
1459 return -ENOMEM;
1460
1461 return 0;
1462 }
1463
1464 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1465 .ndo_init = ip6gre_tap_init,
1466 .ndo_uninit = ip6gre_tunnel_uninit,
1467 .ndo_start_xmit = ip6gre_tunnel_xmit,
1468 .ndo_set_mac_address = eth_mac_addr,
1469 .ndo_validate_addr = eth_validate_addr,
1470 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1471 .ndo_get_stats64 = ip_tunnel_get_stats64,
1472 };
1473
1474 static void ip6gre_tap_setup(struct net_device *dev)
1475 {
1476
1477 ether_setup(dev);
1478
1479 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1480 dev->destructor = ip6gre_dev_free;
1481
1482 dev->iflink = 0;
1483 dev->features |= NETIF_F_NETNS_LOCAL;
1484 }
1485
1486 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1487 struct nlattr *tb[], struct nlattr *data[])
1488 {
1489 struct ip6_tnl *nt;
1490 struct net *net = dev_net(dev);
1491 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1492 int err;
1493
1494 nt = netdev_priv(dev);
1495 ip6gre_netlink_parms(data, &nt->parms);
1496
1497 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1498 return -EEXIST;
1499
1500 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1501 eth_hw_addr_random(dev);
1502
1503 nt->dev = dev;
1504 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1505
1506 /* Can use a lockless transmit, unless we generate output sequences */
1507 if (!(nt->parms.o_flags & GRE_SEQ))
1508 dev->features |= NETIF_F_LLTX;
1509
1510 err = register_netdevice(dev);
1511 if (err)
1512 goto out;
1513
1514 dev_hold(dev);
1515 ip6gre_tunnel_link(ign, nt);
1516
1517 out:
1518 return err;
1519 }
1520
1521 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1522 struct nlattr *data[])
1523 {
1524 struct ip6_tnl *t, *nt;
1525 struct net *net = dev_net(dev);
1526 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1527 struct __ip6_tnl_parm p;
1528
1529 if (dev == ign->fb_tunnel_dev)
1530 return -EINVAL;
1531
1532 nt = netdev_priv(dev);
1533 ip6gre_netlink_parms(data, &p);
1534
1535 t = ip6gre_tunnel_locate(net, &p, 0);
1536
1537 if (t) {
1538 if (t->dev != dev)
1539 return -EEXIST;
1540 } else {
1541 t = nt;
1542
1543 ip6gre_tunnel_unlink(ign, t);
1544 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1545 ip6gre_tunnel_link(ign, t);
1546 netdev_state_change(dev);
1547 }
1548
1549 return 0;
1550 }
1551
1552 static size_t ip6gre_get_size(const struct net_device *dev)
1553 {
1554 return
1555 /* IFLA_GRE_LINK */
1556 nla_total_size(4) +
1557 /* IFLA_GRE_IFLAGS */
1558 nla_total_size(2) +
1559 /* IFLA_GRE_OFLAGS */
1560 nla_total_size(2) +
1561 /* IFLA_GRE_IKEY */
1562 nla_total_size(4) +
1563 /* IFLA_GRE_OKEY */
1564 nla_total_size(4) +
1565 /* IFLA_GRE_LOCAL */
1566 nla_total_size(sizeof(struct in6_addr)) +
1567 /* IFLA_GRE_REMOTE */
1568 nla_total_size(sizeof(struct in6_addr)) +
1569 /* IFLA_GRE_TTL */
1570 nla_total_size(1) +
1571 /* IFLA_GRE_TOS */
1572 nla_total_size(1) +
1573 /* IFLA_GRE_ENCAP_LIMIT */
1574 nla_total_size(1) +
1575 /* IFLA_GRE_FLOWINFO */
1576 nla_total_size(4) +
1577 /* IFLA_GRE_FLAGS */
1578 nla_total_size(4) +
1579 0;
1580 }
1581
1582 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1583 {
1584 struct ip6_tnl *t = netdev_priv(dev);
1585 struct __ip6_tnl_parm *p = &t->parms;
1586
1587 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1588 nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) ||
1589 nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) ||
1590 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1591 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
1592 nla_put(skb, IFLA_GRE_LOCAL, sizeof(struct in6_addr), &p->laddr) ||
1593 nla_put(skb, IFLA_GRE_REMOTE, sizeof(struct in6_addr), &p->raddr) ||
1594 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1595 /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/
1596 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1597 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1598 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags))
1599 goto nla_put_failure;
1600 return 0;
1601
1602 nla_put_failure:
1603 return -EMSGSIZE;
1604 }
1605
1606 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1607 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1608 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1609 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1610 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1611 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1612 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1613 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1614 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1615 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1616 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1617 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1618 };
1619
1620 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1621 .kind = "ip6gre",
1622 .maxtype = IFLA_GRE_MAX,
1623 .policy = ip6gre_policy,
1624 .priv_size = sizeof(struct ip6_tnl),
1625 .setup = ip6gre_tunnel_setup,
1626 .validate = ip6gre_tunnel_validate,
1627 .newlink = ip6gre_newlink,
1628 .changelink = ip6gre_changelink,
1629 .get_size = ip6gre_get_size,
1630 .fill_info = ip6gre_fill_info,
1631 };
1632
1633 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1634 .kind = "ip6gretap",
1635 .maxtype = IFLA_GRE_MAX,
1636 .policy = ip6gre_policy,
1637 .priv_size = sizeof(struct ip6_tnl),
1638 .setup = ip6gre_tap_setup,
1639 .validate = ip6gre_tap_validate,
1640 .newlink = ip6gre_newlink,
1641 .changelink = ip6gre_changelink,
1642 .get_size = ip6gre_get_size,
1643 .fill_info = ip6gre_fill_info,
1644 };
1645
1646 /*
1647 * And now the modules code and kernel interface.
1648 */
1649
1650 static int __init ip6gre_init(void)
1651 {
1652 int err;
1653
1654 pr_info("GRE over IPv6 tunneling driver\n");
1655
1656 err = register_pernet_device(&ip6gre_net_ops);
1657 if (err < 0)
1658 return err;
1659
1660 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1661 if (err < 0) {
1662 pr_info("%s: can't add protocol\n", __func__);
1663 goto add_proto_failed;
1664 }
1665
1666 err = rtnl_link_register(&ip6gre_link_ops);
1667 if (err < 0)
1668 goto rtnl_link_failed;
1669
1670 err = rtnl_link_register(&ip6gre_tap_ops);
1671 if (err < 0)
1672 goto tap_ops_failed;
1673
1674 out:
1675 return err;
1676
1677 tap_ops_failed:
1678 rtnl_link_unregister(&ip6gre_link_ops);
1679 rtnl_link_failed:
1680 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1681 add_proto_failed:
1682 unregister_pernet_device(&ip6gre_net_ops);
1683 goto out;
1684 }
1685
1686 static void __exit ip6gre_fini(void)
1687 {
1688 rtnl_link_unregister(&ip6gre_tap_ops);
1689 rtnl_link_unregister(&ip6gre_link_ops);
1690 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1691 unregister_pernet_device(&ip6gre_net_ops);
1692 }
1693
1694 module_init(ip6gre_init);
1695 module_exit(ip6gre_fini);
1696 MODULE_LICENSE("GPL");
1697 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1698 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1699 MODULE_ALIAS_RTNL_LINK("ip6gre");
1700 MODULE_ALIAS_NETDEV("ip6gre0");
kernel source for telekom puls (alcatel/mediatek)