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net: Explicitly initialize u64_stats_sync structures for lockdep
[deliverable/linux.git] / net / ipv6 / ip6_gre.c
1 /*
2 * GRE over IPv6 protocol decoder.
3 *
4 * Authors: Dmitry Kozlov (xeb@mail.ru)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 */
12
13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15 #include <linux/capability.h>
16 #include <linux/module.h>
17 #include <linux/types.h>
18 #include <linux/kernel.h>
19 #include <linux/slab.h>
20 #include <linux/uaccess.h>
21 #include <linux/skbuff.h>
22 #include <linux/netdevice.h>
23 #include <linux/in.h>
24 #include <linux/tcp.h>
25 #include <linux/udp.h>
26 #include <linux/if_arp.h>
27 #include <linux/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 nt->net = dev_net(dev);
339 ip6gre_tnl_link_config(nt, 1);
340
341 if (register_netdevice(dev) < 0)
342 goto failed_free;
343
344 /* Can use a lockless transmit, unless we generate output sequences */
345 if (!(nt->parms.o_flags & GRE_SEQ))
346 dev->features |= NETIF_F_LLTX;
347
348 dev_hold(dev);
349 ip6gre_tunnel_link(ign, nt);
350 return nt;
351
352 failed_free:
353 free_netdev(dev);
354 return NULL;
355 }
356
357 static void ip6gre_tunnel_uninit(struct net_device *dev)
358 {
359 struct net *net = dev_net(dev);
360 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
361
362 ip6gre_tunnel_unlink(ign, netdev_priv(dev));
363 dev_put(dev);
364 }
365
366
367 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
368 u8 type, u8 code, int offset, __be32 info)
369 {
370 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
371 __be16 *p = (__be16 *)(skb->data + offset);
372 int grehlen = offset + 4;
373 struct ip6_tnl *t;
374 __be16 flags;
375
376 flags = p[0];
377 if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) {
378 if (flags&(GRE_VERSION|GRE_ROUTING))
379 return;
380 if (flags&GRE_KEY) {
381 grehlen += 4;
382 if (flags&GRE_CSUM)
383 grehlen += 4;
384 }
385 }
386
387 /* If only 8 bytes returned, keyed message will be dropped here */
388 if (!pskb_may_pull(skb, grehlen))
389 return;
390 ipv6h = (const struct ipv6hdr *)skb->data;
391 p = (__be16 *)(skb->data + offset);
392
393 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
394 flags & GRE_KEY ?
395 *(((__be32 *)p) + (grehlen / 4) - 1) : 0,
396 p[1]);
397 if (t == NULL)
398 return;
399
400 switch (type) {
401 __u32 teli;
402 struct ipv6_tlv_tnl_enc_lim *tel;
403 __u32 mtu;
404 case ICMPV6_DEST_UNREACH:
405 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
406 t->parms.name);
407 break;
408 case ICMPV6_TIME_EXCEED:
409 if (code == ICMPV6_EXC_HOPLIMIT) {
410 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
411 t->parms.name);
412 }
413 break;
414 case ICMPV6_PARAMPROB:
415 teli = 0;
416 if (code == ICMPV6_HDR_FIELD)
417 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
418
419 if (teli && teli == info - 2) {
420 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
421 if (tel->encap_limit == 0) {
422 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
423 t->parms.name);
424 }
425 } else {
426 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
427 t->parms.name);
428 }
429 break;
430 case ICMPV6_PKT_TOOBIG:
431 mtu = info - offset;
432 if (mtu < IPV6_MIN_MTU)
433 mtu = IPV6_MIN_MTU;
434 t->dev->mtu = mtu;
435 break;
436 }
437
438 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
439 t->err_count++;
440 else
441 t->err_count = 1;
442 t->err_time = jiffies;
443 }
444
445 static int ip6gre_rcv(struct sk_buff *skb)
446 {
447 const struct ipv6hdr *ipv6h;
448 u8 *h;
449 __be16 flags;
450 __sum16 csum = 0;
451 __be32 key = 0;
452 u32 seqno = 0;
453 struct ip6_tnl *tunnel;
454 int offset = 4;
455 __be16 gre_proto;
456 int err;
457
458 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
459 goto drop;
460
461 ipv6h = ipv6_hdr(skb);
462 h = skb->data;
463 flags = *(__be16 *)h;
464
465 if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) {
466 /* - Version must be 0.
467 - We do not support routing headers.
468 */
469 if (flags&(GRE_VERSION|GRE_ROUTING))
470 goto drop;
471
472 if (flags&GRE_CSUM) {
473 switch (skb->ip_summed) {
474 case CHECKSUM_COMPLETE:
475 csum = csum_fold(skb->csum);
476 if (!csum)
477 break;
478 /* fall through */
479 case CHECKSUM_NONE:
480 skb->csum = 0;
481 csum = __skb_checksum_complete(skb);
482 skb->ip_summed = CHECKSUM_COMPLETE;
483 }
484 offset += 4;
485 }
486 if (flags&GRE_KEY) {
487 key = *(__be32 *)(h + offset);
488 offset += 4;
489 }
490 if (flags&GRE_SEQ) {
491 seqno = ntohl(*(__be32 *)(h + offset));
492 offset += 4;
493 }
494 }
495
496 gre_proto = *(__be16 *)(h + 2);
497
498 tunnel = ip6gre_tunnel_lookup(skb->dev,
499 &ipv6h->saddr, &ipv6h->daddr, key,
500 gre_proto);
501 if (tunnel) {
502 struct pcpu_tstats *tstats;
503
504 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
505 goto drop;
506
507 if (!ip6_tnl_rcv_ctl(tunnel, &ipv6h->daddr, &ipv6h->saddr)) {
508 tunnel->dev->stats.rx_dropped++;
509 goto drop;
510 }
511
512 skb->protocol = gre_proto;
513 /* WCCP version 1 and 2 protocol decoding.
514 * - Change protocol to IP
515 * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
516 */
517 if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) {
518 skb->protocol = htons(ETH_P_IP);
519 if ((*(h + offset) & 0xF0) != 0x40)
520 offset += 4;
521 }
522
523 skb->mac_header = skb->network_header;
524 __pskb_pull(skb, offset);
525 skb_postpull_rcsum(skb, skb_transport_header(skb), offset);
526
527 if (((flags&GRE_CSUM) && csum) ||
528 (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) {
529 tunnel->dev->stats.rx_crc_errors++;
530 tunnel->dev->stats.rx_errors++;
531 goto drop;
532 }
533 if (tunnel->parms.i_flags&GRE_SEQ) {
534 if (!(flags&GRE_SEQ) ||
535 (tunnel->i_seqno &&
536 (s32)(seqno - tunnel->i_seqno) < 0)) {
537 tunnel->dev->stats.rx_fifo_errors++;
538 tunnel->dev->stats.rx_errors++;
539 goto drop;
540 }
541 tunnel->i_seqno = seqno + 1;
542 }
543
544 /* Warning: All skb pointers will be invalidated! */
545 if (tunnel->dev->type == ARPHRD_ETHER) {
546 if (!pskb_may_pull(skb, ETH_HLEN)) {
547 tunnel->dev->stats.rx_length_errors++;
548 tunnel->dev->stats.rx_errors++;
549 goto drop;
550 }
551
552 ipv6h = ipv6_hdr(skb);
553 skb->protocol = eth_type_trans(skb, tunnel->dev);
554 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
555 }
556
557 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
558
559 skb_reset_network_header(skb);
560
561 err = IP6_ECN_decapsulate(ipv6h, skb);
562 if (unlikely(err)) {
563 if (log_ecn_error)
564 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
565 &ipv6h->saddr,
566 ipv6_get_dsfield(ipv6h));
567 if (err > 1) {
568 ++tunnel->dev->stats.rx_frame_errors;
569 ++tunnel->dev->stats.rx_errors;
570 goto drop;
571 }
572 }
573
574 tstats = this_cpu_ptr(tunnel->dev->tstats);
575 u64_stats_update_begin(&tstats->syncp);
576 tstats->rx_packets++;
577 tstats->rx_bytes += skb->len;
578 u64_stats_update_end(&tstats->syncp);
579
580 netif_rx(skb);
581
582 return 0;
583 }
584 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
585
586 drop:
587 kfree_skb(skb);
588 return 0;
589 }
590
591 struct ipv6_tel_txoption {
592 struct ipv6_txoptions ops;
593 __u8 dst_opt[8];
594 };
595
596 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
597 {
598 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
599
600 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
601 opt->dst_opt[3] = 1;
602 opt->dst_opt[4] = encap_limit;
603 opt->dst_opt[5] = IPV6_TLV_PADN;
604 opt->dst_opt[6] = 1;
605
606 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
607 opt->ops.opt_nflen = 8;
608 }
609
610 static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
611 struct net_device *dev,
612 __u8 dsfield,
613 struct flowi6 *fl6,
614 int encap_limit,
615 __u32 *pmtu)
616 {
617 struct net *net = dev_net(dev);
618 struct ip6_tnl *tunnel = netdev_priv(dev);
619 struct net_device *tdev; /* Device to other host */
620 struct ipv6hdr *ipv6h; /* Our new IP header */
621 unsigned int max_headroom = 0; /* The extra header space needed */
622 int gre_hlen;
623 struct ipv6_tel_txoption opt;
624 int mtu;
625 struct dst_entry *dst = NULL, *ndst = NULL;
626 struct net_device_stats *stats = &tunnel->dev->stats;
627 int err = -1;
628 u8 proto;
629 struct sk_buff *new_skb;
630
631 if (dev->type == ARPHRD_ETHER)
632 IPCB(skb)->flags = 0;
633
634 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) {
635 gre_hlen = 0;
636 ipv6h = (struct ipv6hdr *)skb->data;
637 fl6->daddr = ipv6h->daddr;
638 } else {
639 gre_hlen = tunnel->hlen;
640 fl6->daddr = tunnel->parms.raddr;
641 }
642
643 if (!fl6->flowi6_mark)
644 dst = ip6_tnl_dst_check(tunnel);
645
646 if (!dst) {
647 ndst = ip6_route_output(net, NULL, fl6);
648
649 if (ndst->error)
650 goto tx_err_link_failure;
651 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
652 if (IS_ERR(ndst)) {
653 err = PTR_ERR(ndst);
654 ndst = NULL;
655 goto tx_err_link_failure;
656 }
657 dst = ndst;
658 }
659
660 tdev = dst->dev;
661
662 if (tdev == dev) {
663 stats->collisions++;
664 net_warn_ratelimited("%s: Local routing loop detected!\n",
665 tunnel->parms.name);
666 goto tx_err_dst_release;
667 }
668
669 mtu = dst_mtu(dst) - sizeof(*ipv6h);
670 if (encap_limit >= 0) {
671 max_headroom += 8;
672 mtu -= 8;
673 }
674 if (mtu < IPV6_MIN_MTU)
675 mtu = IPV6_MIN_MTU;
676 if (skb_dst(skb))
677 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
678 if (skb->len > mtu) {
679 *pmtu = mtu;
680 err = -EMSGSIZE;
681 goto tx_err_dst_release;
682 }
683
684 if (tunnel->err_count > 0) {
685 if (time_before(jiffies,
686 tunnel->err_time + IP6TUNNEL_ERR_TIMEO)) {
687 tunnel->err_count--;
688
689 dst_link_failure(skb);
690 } else
691 tunnel->err_count = 0;
692 }
693
694 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
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 if (fl6->flowi6_mark) {
713 skb_dst_set(skb, dst);
714 ndst = NULL;
715 } else {
716 skb_dst_set_noref(skb, dst);
717 }
718
719 proto = NEXTHDR_GRE;
720 if (encap_limit >= 0) {
721 init_tel_txopt(&opt, encap_limit);
722 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
723 }
724
725 if (likely(!skb->encapsulation)) {
726 skb_reset_inner_headers(skb);
727 skb->encapsulation = 1;
728 }
729
730 skb_push(skb, gre_hlen);
731 skb_reset_network_header(skb);
732 skb_set_transport_header(skb, sizeof(*ipv6h));
733
734 /*
735 * Push down and install the IP header.
736 */
737 ipv6h = ipv6_hdr(skb);
738 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), fl6->flowlabel);
739 ipv6h->hop_limit = tunnel->parms.hop_limit;
740 ipv6h->nexthdr = proto;
741 ipv6h->saddr = fl6->saddr;
742 ipv6h->daddr = fl6->daddr;
743
744 ((__be16 *)(ipv6h + 1))[0] = tunnel->parms.o_flags;
745 ((__be16 *)(ipv6h + 1))[1] = (dev->type == ARPHRD_ETHER) ?
746 htons(ETH_P_TEB) : skb->protocol;
747
748 if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) {
749 __be32 *ptr = (__be32 *)(((u8 *)ipv6h) + tunnel->hlen - 4);
750
751 if (tunnel->parms.o_flags&GRE_SEQ) {
752 ++tunnel->o_seqno;
753 *ptr = htonl(tunnel->o_seqno);
754 ptr--;
755 }
756 if (tunnel->parms.o_flags&GRE_KEY) {
757 *ptr = tunnel->parms.o_key;
758 ptr--;
759 }
760 if (tunnel->parms.o_flags&GRE_CSUM) {
761 *ptr = 0;
762 *(__sum16 *)ptr = ip_compute_csum((void *)(ipv6h+1),
763 skb->len - sizeof(struct ipv6hdr));
764 }
765 }
766
767 ip6tunnel_xmit(skb, dev);
768 if (ndst)
769 ip6_tnl_dst_store(tunnel, ndst);
770 return 0;
771 tx_err_link_failure:
772 stats->tx_carrier_errors++;
773 dst_link_failure(skb);
774 tx_err_dst_release:
775 dst_release(ndst);
776 return err;
777 }
778
779 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
780 {
781 struct ip6_tnl *t = netdev_priv(dev);
782 const struct iphdr *iph = ip_hdr(skb);
783 int encap_limit = -1;
784 struct flowi6 fl6;
785 __u8 dsfield;
786 __u32 mtu;
787 int err;
788
789 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
790 encap_limit = t->parms.encap_limit;
791
792 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
793 fl6.flowi6_proto = IPPROTO_IPIP;
794
795 dsfield = ipv4_get_dsfield(iph);
796
797 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
798 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
799 & IPV6_TCLASS_MASK;
800 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
801 fl6.flowi6_mark = skb->mark;
802
803 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
804 if (err != 0) {
805 /* XXX: send ICMP error even if DF is not set. */
806 if (err == -EMSGSIZE)
807 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
808 htonl(mtu));
809 return -1;
810 }
811
812 return 0;
813 }
814
815 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
816 {
817 struct ip6_tnl *t = netdev_priv(dev);
818 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
819 int encap_limit = -1;
820 __u16 offset;
821 struct flowi6 fl6;
822 __u8 dsfield;
823 __u32 mtu;
824 int err;
825
826 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
827 return -1;
828
829 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
830 if (offset > 0) {
831 struct ipv6_tlv_tnl_enc_lim *tel;
832 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
833 if (tel->encap_limit == 0) {
834 icmpv6_send(skb, ICMPV6_PARAMPROB,
835 ICMPV6_HDR_FIELD, offset + 2);
836 return -1;
837 }
838 encap_limit = tel->encap_limit - 1;
839 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
840 encap_limit = t->parms.encap_limit;
841
842 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
843 fl6.flowi6_proto = IPPROTO_IPV6;
844
845 dsfield = ipv6_get_dsfield(ipv6h);
846 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
847 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
848 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
849 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK);
850 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
851 fl6.flowi6_mark = skb->mark;
852
853 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
854 if (err != 0) {
855 if (err == -EMSGSIZE)
856 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
857 return -1;
858 }
859
860 return 0;
861 }
862
863 /**
864 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
865 * @t: the outgoing tunnel device
866 * @hdr: IPv6 header from the incoming packet
867 *
868 * Description:
869 * Avoid trivial tunneling loop by checking that tunnel exit-point
870 * doesn't match source of incoming packet.
871 *
872 * Return:
873 * 1 if conflict,
874 * 0 else
875 **/
876
877 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
878 const struct ipv6hdr *hdr)
879 {
880 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
881 }
882
883 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
884 {
885 struct ip6_tnl *t = netdev_priv(dev);
886 int encap_limit = -1;
887 struct flowi6 fl6;
888 __u32 mtu;
889 int err;
890
891 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
892 encap_limit = t->parms.encap_limit;
893
894 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
895 fl6.flowi6_proto = skb->protocol;
896
897 err = ip6gre_xmit2(skb, dev, 0, &fl6, encap_limit, &mtu);
898
899 return err;
900 }
901
902 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
903 struct net_device *dev)
904 {
905 struct ip6_tnl *t = netdev_priv(dev);
906 struct net_device_stats *stats = &t->dev->stats;
907 int ret;
908
909 if (!ip6_tnl_xmit_ctl(t))
910 goto tx_err;
911
912 switch (skb->protocol) {
913 case htons(ETH_P_IP):
914 ret = ip6gre_xmit_ipv4(skb, dev);
915 break;
916 case htons(ETH_P_IPV6):
917 ret = ip6gre_xmit_ipv6(skb, dev);
918 break;
919 default:
920 ret = ip6gre_xmit_other(skb, dev);
921 break;
922 }
923
924 if (ret < 0)
925 goto tx_err;
926
927 return NETDEV_TX_OK;
928
929 tx_err:
930 stats->tx_errors++;
931 stats->tx_dropped++;
932 kfree_skb(skb);
933 return NETDEV_TX_OK;
934 }
935
936 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
937 {
938 struct net_device *dev = t->dev;
939 struct __ip6_tnl_parm *p = &t->parms;
940 struct flowi6 *fl6 = &t->fl.u.ip6;
941 int addend = sizeof(struct ipv6hdr) + 4;
942
943 if (dev->type != ARPHRD_ETHER) {
944 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
945 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
946 }
947
948 /* Set up flowi template */
949 fl6->saddr = p->laddr;
950 fl6->daddr = p->raddr;
951 fl6->flowi6_oif = p->link;
952 fl6->flowlabel = 0;
953
954 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
955 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
956 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
957 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
958
959 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
960 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
961
962 if (p->flags&IP6_TNL_F_CAP_XMIT &&
963 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
964 dev->flags |= IFF_POINTOPOINT;
965 else
966 dev->flags &= ~IFF_POINTOPOINT;
967
968 dev->iflink = p->link;
969
970 /* Precalculate GRE options length */
971 if (t->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) {
972 if (t->parms.o_flags&GRE_CSUM)
973 addend += 4;
974 if (t->parms.o_flags&GRE_KEY)
975 addend += 4;
976 if (t->parms.o_flags&GRE_SEQ)
977 addend += 4;
978 }
979 t->hlen = addend;
980
981 if (p->flags & IP6_TNL_F_CAP_XMIT) {
982 int strict = (ipv6_addr_type(&p->raddr) &
983 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
984
985 struct rt6_info *rt = rt6_lookup(dev_net(dev),
986 &p->raddr, &p->laddr,
987 p->link, strict);
988
989 if (rt == NULL)
990 return;
991
992 if (rt->dst.dev) {
993 dev->hard_header_len = rt->dst.dev->hard_header_len + addend;
994
995 if (set_mtu) {
996 dev->mtu = rt->dst.dev->mtu - addend;
997 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
998 dev->mtu -= 8;
999
1000 if (dev->mtu < IPV6_MIN_MTU)
1001 dev->mtu = IPV6_MIN_MTU;
1002 }
1003 }
1004 ip6_rt_put(rt);
1005 }
1006 }
1007
1008 static int ip6gre_tnl_change(struct ip6_tnl *t,
1009 const struct __ip6_tnl_parm *p, int set_mtu)
1010 {
1011 t->parms.laddr = p->laddr;
1012 t->parms.raddr = p->raddr;
1013 t->parms.flags = p->flags;
1014 t->parms.hop_limit = p->hop_limit;
1015 t->parms.encap_limit = p->encap_limit;
1016 t->parms.flowinfo = p->flowinfo;
1017 t->parms.link = p->link;
1018 t->parms.proto = p->proto;
1019 t->parms.i_key = p->i_key;
1020 t->parms.o_key = p->o_key;
1021 t->parms.i_flags = p->i_flags;
1022 t->parms.o_flags = p->o_flags;
1023 ip6_tnl_dst_reset(t);
1024 ip6gre_tnl_link_config(t, set_mtu);
1025 return 0;
1026 }
1027
1028 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1029 const struct ip6_tnl_parm2 *u)
1030 {
1031 p->laddr = u->laddr;
1032 p->raddr = u->raddr;
1033 p->flags = u->flags;
1034 p->hop_limit = u->hop_limit;
1035 p->encap_limit = u->encap_limit;
1036 p->flowinfo = u->flowinfo;
1037 p->link = u->link;
1038 p->i_key = u->i_key;
1039 p->o_key = u->o_key;
1040 p->i_flags = u->i_flags;
1041 p->o_flags = u->o_flags;
1042 memcpy(p->name, u->name, sizeof(u->name));
1043 }
1044
1045 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1046 const struct __ip6_tnl_parm *p)
1047 {
1048 u->proto = IPPROTO_GRE;
1049 u->laddr = p->laddr;
1050 u->raddr = p->raddr;
1051 u->flags = p->flags;
1052 u->hop_limit = p->hop_limit;
1053 u->encap_limit = p->encap_limit;
1054 u->flowinfo = p->flowinfo;
1055 u->link = p->link;
1056 u->i_key = p->i_key;
1057 u->o_key = p->o_key;
1058 u->i_flags = p->i_flags;
1059 u->o_flags = p->o_flags;
1060 memcpy(u->name, p->name, sizeof(u->name));
1061 }
1062
1063 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1064 struct ifreq *ifr, int cmd)
1065 {
1066 int err = 0;
1067 struct ip6_tnl_parm2 p;
1068 struct __ip6_tnl_parm p1;
1069 struct ip6_tnl *t;
1070 struct net *net = dev_net(dev);
1071 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1072
1073 switch (cmd) {
1074 case SIOCGETTUNNEL:
1075 t = NULL;
1076 if (dev == ign->fb_tunnel_dev) {
1077 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1078 err = -EFAULT;
1079 break;
1080 }
1081 ip6gre_tnl_parm_from_user(&p1, &p);
1082 t = ip6gre_tunnel_locate(net, &p1, 0);
1083 }
1084 if (t == NULL)
1085 t = netdev_priv(dev);
1086 memset(&p, 0, sizeof(p));
1087 ip6gre_tnl_parm_to_user(&p, &t->parms);
1088 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1089 err = -EFAULT;
1090 break;
1091
1092 case SIOCADDTUNNEL:
1093 case SIOCCHGTUNNEL:
1094 err = -EPERM;
1095 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1096 goto done;
1097
1098 err = -EFAULT;
1099 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1100 goto done;
1101
1102 err = -EINVAL;
1103 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1104 goto done;
1105
1106 if (!(p.i_flags&GRE_KEY))
1107 p.i_key = 0;
1108 if (!(p.o_flags&GRE_KEY))
1109 p.o_key = 0;
1110
1111 ip6gre_tnl_parm_from_user(&p1, &p);
1112 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1113
1114 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1115 if (t != NULL) {
1116 if (t->dev != dev) {
1117 err = -EEXIST;
1118 break;
1119 }
1120 } else {
1121 t = netdev_priv(dev);
1122
1123 ip6gre_tunnel_unlink(ign, t);
1124 synchronize_net();
1125 ip6gre_tnl_change(t, &p1, 1);
1126 ip6gre_tunnel_link(ign, t);
1127 netdev_state_change(dev);
1128 }
1129 }
1130
1131 if (t) {
1132 err = 0;
1133
1134 memset(&p, 0, sizeof(p));
1135 ip6gre_tnl_parm_to_user(&p, &t->parms);
1136 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1137 err = -EFAULT;
1138 } else
1139 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1140 break;
1141
1142 case SIOCDELTUNNEL:
1143 err = -EPERM;
1144 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1145 goto done;
1146
1147 if (dev == ign->fb_tunnel_dev) {
1148 err = -EFAULT;
1149 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1150 goto done;
1151 err = -ENOENT;
1152 ip6gre_tnl_parm_from_user(&p1, &p);
1153 t = ip6gre_tunnel_locate(net, &p1, 0);
1154 if (t == NULL)
1155 goto done;
1156 err = -EPERM;
1157 if (t == netdev_priv(ign->fb_tunnel_dev))
1158 goto done;
1159 dev = t->dev;
1160 }
1161 unregister_netdevice(dev);
1162 err = 0;
1163 break;
1164
1165 default:
1166 err = -EINVAL;
1167 }
1168
1169 done:
1170 return err;
1171 }
1172
1173 static int ip6gre_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1174 {
1175 if (new_mtu < 68 ||
1176 new_mtu > 0xFFF8 - dev->hard_header_len)
1177 return -EINVAL;
1178 dev->mtu = new_mtu;
1179 return 0;
1180 }
1181
1182 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1183 unsigned short type,
1184 const void *daddr, const void *saddr, unsigned int len)
1185 {
1186 struct ip6_tnl *t = netdev_priv(dev);
1187 struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen);
1188 __be16 *p = (__be16 *)(ipv6h+1);
1189
1190 ip6_flow_hdr(ipv6h, 0, t->fl.u.ip6.flowlabel);
1191 ipv6h->hop_limit = t->parms.hop_limit;
1192 ipv6h->nexthdr = NEXTHDR_GRE;
1193 ipv6h->saddr = t->parms.laddr;
1194 ipv6h->daddr = t->parms.raddr;
1195
1196 p[0] = t->parms.o_flags;
1197 p[1] = htons(type);
1198
1199 /*
1200 * Set the source hardware address.
1201 */
1202
1203 if (saddr)
1204 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1205 if (daddr)
1206 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1207 if (!ipv6_addr_any(&ipv6h->daddr))
1208 return t->hlen;
1209
1210 return -t->hlen;
1211 }
1212
1213 static const struct header_ops ip6gre_header_ops = {
1214 .create = ip6gre_header,
1215 };
1216
1217 static const struct net_device_ops ip6gre_netdev_ops = {
1218 .ndo_init = ip6gre_tunnel_init,
1219 .ndo_uninit = ip6gre_tunnel_uninit,
1220 .ndo_start_xmit = ip6gre_tunnel_xmit,
1221 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1222 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1223 .ndo_get_stats64 = ip_tunnel_get_stats64,
1224 };
1225
1226 static void ip6gre_dev_free(struct net_device *dev)
1227 {
1228 free_percpu(dev->tstats);
1229 free_netdev(dev);
1230 }
1231
1232 static void ip6gre_tunnel_setup(struct net_device *dev)
1233 {
1234 struct ip6_tnl *t;
1235
1236 dev->netdev_ops = &ip6gre_netdev_ops;
1237 dev->destructor = ip6gre_dev_free;
1238
1239 dev->type = ARPHRD_IP6GRE;
1240 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr) + 4;
1241 dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr) - 4;
1242 t = netdev_priv(dev);
1243 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1244 dev->mtu -= 8;
1245 dev->flags |= IFF_NOARP;
1246 dev->iflink = 0;
1247 dev->addr_len = sizeof(struct in6_addr);
1248 dev->features |= NETIF_F_NETNS_LOCAL;
1249 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1250 }
1251
1252 static int ip6gre_tunnel_init(struct net_device *dev)
1253 {
1254 struct ip6_tnl *tunnel;
1255 int i;
1256
1257 tunnel = netdev_priv(dev);
1258
1259 tunnel->dev = dev;
1260 tunnel->net = dev_net(dev);
1261 strcpy(tunnel->parms.name, dev->name);
1262
1263 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1264 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1265
1266 if (ipv6_addr_any(&tunnel->parms.raddr))
1267 dev->header_ops = &ip6gre_header_ops;
1268
1269 dev->tstats = alloc_percpu(struct pcpu_tstats);
1270 if (!dev->tstats)
1271 return -ENOMEM;
1272
1273 for_each_possible_cpu(i) {
1274 struct pcpu_tstats *ip6gre_tunnel_stats;
1275 ip6gre_tunnel_stats = per_cpu_ptr(dev->tstats, i);
1276 u64_stats_init(&ip6gre_tunnel_stats->syncp);
1277 }
1278
1279
1280 return 0;
1281 }
1282
1283 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1284 {
1285 struct ip6_tnl *tunnel = netdev_priv(dev);
1286
1287 tunnel->dev = dev;
1288 tunnel->net = dev_net(dev);
1289 strcpy(tunnel->parms.name, dev->name);
1290
1291 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1292
1293 dev_hold(dev);
1294 }
1295
1296
1297 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1298 .handler = ip6gre_rcv,
1299 .err_handler = ip6gre_err,
1300 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1301 };
1302
1303 static void ip6gre_destroy_tunnels(struct ip6gre_net *ign,
1304 struct list_head *head)
1305 {
1306 int prio;
1307
1308 for (prio = 0; prio < 4; prio++) {
1309 int h;
1310 for (h = 0; h < HASH_SIZE; h++) {
1311 struct ip6_tnl *t;
1312
1313 t = rtnl_dereference(ign->tunnels[prio][h]);
1314
1315 while (t != NULL) {
1316 unregister_netdevice_queue(t->dev, head);
1317 t = rtnl_dereference(t->next);
1318 }
1319 }
1320 }
1321 }
1322
1323 static int __net_init ip6gre_init_net(struct net *net)
1324 {
1325 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1326 int err;
1327
1328 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1329 ip6gre_tunnel_setup);
1330 if (!ign->fb_tunnel_dev) {
1331 err = -ENOMEM;
1332 goto err_alloc_dev;
1333 }
1334 dev_net_set(ign->fb_tunnel_dev, net);
1335
1336 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1337 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1338
1339 err = register_netdev(ign->fb_tunnel_dev);
1340 if (err)
1341 goto err_reg_dev;
1342
1343 rcu_assign_pointer(ign->tunnels_wc[0],
1344 netdev_priv(ign->fb_tunnel_dev));
1345 return 0;
1346
1347 err_reg_dev:
1348 ip6gre_dev_free(ign->fb_tunnel_dev);
1349 err_alloc_dev:
1350 return err;
1351 }
1352
1353 static void __net_exit ip6gre_exit_net(struct net *net)
1354 {
1355 struct ip6gre_net *ign;
1356 LIST_HEAD(list);
1357
1358 ign = net_generic(net, ip6gre_net_id);
1359 rtnl_lock();
1360 ip6gre_destroy_tunnels(ign, &list);
1361 unregister_netdevice_many(&list);
1362 rtnl_unlock();
1363 }
1364
1365 static struct pernet_operations ip6gre_net_ops = {
1366 .init = ip6gre_init_net,
1367 .exit = ip6gre_exit_net,
1368 .id = &ip6gre_net_id,
1369 .size = sizeof(struct ip6gre_net),
1370 };
1371
1372 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
1373 {
1374 __be16 flags;
1375
1376 if (!data)
1377 return 0;
1378
1379 flags = 0;
1380 if (data[IFLA_GRE_IFLAGS])
1381 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1382 if (data[IFLA_GRE_OFLAGS])
1383 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1384 if (flags & (GRE_VERSION|GRE_ROUTING))
1385 return -EINVAL;
1386
1387 return 0;
1388 }
1389
1390 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
1391 {
1392 struct in6_addr daddr;
1393
1394 if (tb[IFLA_ADDRESS]) {
1395 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1396 return -EINVAL;
1397 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1398 return -EADDRNOTAVAIL;
1399 }
1400
1401 if (!data)
1402 goto out;
1403
1404 if (data[IFLA_GRE_REMOTE]) {
1405 nla_memcpy(&daddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1406 if (ipv6_addr_any(&daddr))
1407 return -EINVAL;
1408 }
1409
1410 out:
1411 return ip6gre_tunnel_validate(tb, data);
1412 }
1413
1414
1415 static void ip6gre_netlink_parms(struct nlattr *data[],
1416 struct __ip6_tnl_parm *parms)
1417 {
1418 memset(parms, 0, sizeof(*parms));
1419
1420 if (!data)
1421 return;
1422
1423 if (data[IFLA_GRE_LINK])
1424 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1425
1426 if (data[IFLA_GRE_IFLAGS])
1427 parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]);
1428
1429 if (data[IFLA_GRE_OFLAGS])
1430 parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]);
1431
1432 if (data[IFLA_GRE_IKEY])
1433 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1434
1435 if (data[IFLA_GRE_OKEY])
1436 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1437
1438 if (data[IFLA_GRE_LOCAL])
1439 nla_memcpy(&parms->laddr, data[IFLA_GRE_LOCAL], sizeof(struct in6_addr));
1440
1441 if (data[IFLA_GRE_REMOTE])
1442 nla_memcpy(&parms->raddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1443
1444 if (data[IFLA_GRE_TTL])
1445 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1446
1447 if (data[IFLA_GRE_ENCAP_LIMIT])
1448 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1449
1450 if (data[IFLA_GRE_FLOWINFO])
1451 parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]);
1452
1453 if (data[IFLA_GRE_FLAGS])
1454 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1455 }
1456
1457 static int ip6gre_tap_init(struct net_device *dev)
1458 {
1459 struct ip6_tnl *tunnel;
1460 int i;
1461
1462 tunnel = netdev_priv(dev);
1463
1464 tunnel->dev = dev;
1465 tunnel->net = dev_net(dev);
1466 strcpy(tunnel->parms.name, dev->name);
1467
1468 ip6gre_tnl_link_config(tunnel, 1);
1469
1470 dev->tstats = alloc_percpu(struct pcpu_tstats);
1471 if (!dev->tstats)
1472 return -ENOMEM;
1473
1474 for_each_possible_cpu(i) {
1475 struct pcpu_tstats *ip6gre_tap_stats;
1476 ip6gre_tap_stats = per_cpu_ptr(dev->tstats, i);
1477 u64_stats_init(&ip6gre_tap_stats->syncp);
1478 }
1479
1480 return 0;
1481 }
1482
1483 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1484 .ndo_init = ip6gre_tap_init,
1485 .ndo_uninit = ip6gre_tunnel_uninit,
1486 .ndo_start_xmit = ip6gre_tunnel_xmit,
1487 .ndo_set_mac_address = eth_mac_addr,
1488 .ndo_validate_addr = eth_validate_addr,
1489 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1490 .ndo_get_stats64 = ip_tunnel_get_stats64,
1491 };
1492
1493 static void ip6gre_tap_setup(struct net_device *dev)
1494 {
1495
1496 ether_setup(dev);
1497
1498 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1499 dev->destructor = ip6gre_dev_free;
1500
1501 dev->iflink = 0;
1502 dev->features |= NETIF_F_NETNS_LOCAL;
1503 }
1504
1505 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1506 struct nlattr *tb[], struct nlattr *data[])
1507 {
1508 struct ip6_tnl *nt;
1509 struct net *net = dev_net(dev);
1510 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1511 int err;
1512
1513 nt = netdev_priv(dev);
1514 ip6gre_netlink_parms(data, &nt->parms);
1515
1516 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1517 return -EEXIST;
1518
1519 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1520 eth_hw_addr_random(dev);
1521
1522 nt->dev = dev;
1523 nt->net = dev_net(dev);
1524 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1525
1526 /* Can use a lockless transmit, unless we generate output sequences */
1527 if (!(nt->parms.o_flags & GRE_SEQ))
1528 dev->features |= NETIF_F_LLTX;
1529
1530 err = register_netdevice(dev);
1531 if (err)
1532 goto out;
1533
1534 dev_hold(dev);
1535 ip6gre_tunnel_link(ign, nt);
1536
1537 out:
1538 return err;
1539 }
1540
1541 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1542 struct nlattr *data[])
1543 {
1544 struct ip6_tnl *t, *nt;
1545 struct net *net = dev_net(dev);
1546 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1547 struct __ip6_tnl_parm p;
1548
1549 if (dev == ign->fb_tunnel_dev)
1550 return -EINVAL;
1551
1552 nt = netdev_priv(dev);
1553 ip6gre_netlink_parms(data, &p);
1554
1555 t = ip6gre_tunnel_locate(net, &p, 0);
1556
1557 if (t) {
1558 if (t->dev != dev)
1559 return -EEXIST;
1560 } else {
1561 t = nt;
1562
1563 ip6gre_tunnel_unlink(ign, t);
1564 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1565 ip6gre_tunnel_link(ign, t);
1566 netdev_state_change(dev);
1567 }
1568
1569 return 0;
1570 }
1571
1572 static size_t ip6gre_get_size(const struct net_device *dev)
1573 {
1574 return
1575 /* IFLA_GRE_LINK */
1576 nla_total_size(4) +
1577 /* IFLA_GRE_IFLAGS */
1578 nla_total_size(2) +
1579 /* IFLA_GRE_OFLAGS */
1580 nla_total_size(2) +
1581 /* IFLA_GRE_IKEY */
1582 nla_total_size(4) +
1583 /* IFLA_GRE_OKEY */
1584 nla_total_size(4) +
1585 /* IFLA_GRE_LOCAL */
1586 nla_total_size(sizeof(struct in6_addr)) +
1587 /* IFLA_GRE_REMOTE */
1588 nla_total_size(sizeof(struct in6_addr)) +
1589 /* IFLA_GRE_TTL */
1590 nla_total_size(1) +
1591 /* IFLA_GRE_TOS */
1592 nla_total_size(1) +
1593 /* IFLA_GRE_ENCAP_LIMIT */
1594 nla_total_size(1) +
1595 /* IFLA_GRE_FLOWINFO */
1596 nla_total_size(4) +
1597 /* IFLA_GRE_FLAGS */
1598 nla_total_size(4) +
1599 0;
1600 }
1601
1602 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1603 {
1604 struct ip6_tnl *t = netdev_priv(dev);
1605 struct __ip6_tnl_parm *p = &t->parms;
1606
1607 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1608 nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) ||
1609 nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) ||
1610 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1611 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
1612 nla_put(skb, IFLA_GRE_LOCAL, sizeof(struct in6_addr), &p->laddr) ||
1613 nla_put(skb, IFLA_GRE_REMOTE, sizeof(struct in6_addr), &p->raddr) ||
1614 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1615 /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/
1616 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1617 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1618 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags))
1619 goto nla_put_failure;
1620 return 0;
1621
1622 nla_put_failure:
1623 return -EMSGSIZE;
1624 }
1625
1626 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1627 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1628 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1629 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1630 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1631 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1632 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1633 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1634 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1635 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1636 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1637 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1638 };
1639
1640 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1641 .kind = "ip6gre",
1642 .maxtype = IFLA_GRE_MAX,
1643 .policy = ip6gre_policy,
1644 .priv_size = sizeof(struct ip6_tnl),
1645 .setup = ip6gre_tunnel_setup,
1646 .validate = ip6gre_tunnel_validate,
1647 .newlink = ip6gre_newlink,
1648 .changelink = ip6gre_changelink,
1649 .get_size = ip6gre_get_size,
1650 .fill_info = ip6gre_fill_info,
1651 };
1652
1653 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1654 .kind = "ip6gretap",
1655 .maxtype = IFLA_GRE_MAX,
1656 .policy = ip6gre_policy,
1657 .priv_size = sizeof(struct ip6_tnl),
1658 .setup = ip6gre_tap_setup,
1659 .validate = ip6gre_tap_validate,
1660 .newlink = ip6gre_newlink,
1661 .changelink = ip6gre_changelink,
1662 .get_size = ip6gre_get_size,
1663 .fill_info = ip6gre_fill_info,
1664 };
1665
1666 /*
1667 * And now the modules code and kernel interface.
1668 */
1669
1670 static int __init ip6gre_init(void)
1671 {
1672 int err;
1673
1674 pr_info("GRE over IPv6 tunneling driver\n");
1675
1676 err = register_pernet_device(&ip6gre_net_ops);
1677 if (err < 0)
1678 return err;
1679
1680 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1681 if (err < 0) {
1682 pr_info("%s: can't add protocol\n", __func__);
1683 goto add_proto_failed;
1684 }
1685
1686 err = rtnl_link_register(&ip6gre_link_ops);
1687 if (err < 0)
1688 goto rtnl_link_failed;
1689
1690 err = rtnl_link_register(&ip6gre_tap_ops);
1691 if (err < 0)
1692 goto tap_ops_failed;
1693
1694 out:
1695 return err;
1696
1697 tap_ops_failed:
1698 rtnl_link_unregister(&ip6gre_link_ops);
1699 rtnl_link_failed:
1700 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1701 add_proto_failed:
1702 unregister_pernet_device(&ip6gre_net_ops);
1703 goto out;
1704 }
1705
1706 static void __exit ip6gre_fini(void)
1707 {
1708 rtnl_link_unregister(&ip6gre_tap_ops);
1709 rtnl_link_unregister(&ip6gre_link_ops);
1710 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1711 unregister_pernet_device(&ip6gre_net_ops);
1712 }
1713
1714 module_init(ip6gre_init);
1715 module_exit(ip6gre_fini);
1716 MODULE_LICENSE("GPL");
1717 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1718 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1719 MODULE_ALIAS_RTNL_LINK("ip6gre");
1720 MODULE_ALIAS_NETDEV("ip6gre0");
Linux kernel - Deliverables
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