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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux...
[deliverable/linux.git] / net / ipv6 / ip6_gre.c
CommitLineData
c12b395a 1/*
2 * GRE over IPv6 protocol decoder.
3 *
4 * Authors: Dmitry Kozlov (xeb@mail.ru)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 */
12
13#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15#include <linux/capability.h>
16#include <linux/module.h>
17#include <linux/types.h>
18#include <linux/kernel.h>
19#include <linux/slab.h>
20#include <linux/uaccess.h>
21#include <linux/skbuff.h>
22#include <linux/netdevice.h>
23#include <linux/in.h>
24#include <linux/tcp.h>
25#include <linux/udp.h>
26#include <linux/if_arp.h>
27#include <linux/mroute.h>
28#include <linux/init.h>
29#include <linux/in6.h>
30#include <linux/inetdevice.h>
31#include <linux/igmp.h>
32#include <linux/netfilter_ipv4.h>
33#include <linux/etherdevice.h>
34#include <linux/if_ether.h>
35#include <linux/hash.h>
36#include <linux/if_tunnel.h>
37#include <linux/ip6_tunnel.h>
38
39#include <net/sock.h>
40#include <net/ip.h>
41#include <net/icmp.h>
42#include <net/protocol.h>
43#include <net/addrconf.h>
44#include <net/arp.h>
45#include <net/checksum.h>
46#include <net/dsfield.h>
47#include <net/inet_ecn.h>
48#include <net/xfrm.h>
49#include <net/net_namespace.h>
50#include <net/netns/generic.h>
51#include <net/rtnetlink.h>
52
53#include <net/ipv6.h>
54#include <net/ip6_fib.h>
55#include <net/ip6_route.h>
56#include <net/ip6_tunnel.h>
57
58
eccc1bb8 59static bool log_ecn_error = true;
60module_param(log_ecn_error, bool, 0644);
61MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
62
c12b395a 63#define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
64#define IPV6_TCLASS_SHIFT 20
65
66#define HASH_SIZE_SHIFT 5
67#define HASH_SIZE (1 << HASH_SIZE_SHIFT)
68
69static int ip6gre_net_id __read_mostly;
70struct ip6gre_net {
71 struct ip6_tnl __rcu *tunnels[4][HASH_SIZE];
72
73 struct net_device *fb_tunnel_dev;
74};
75
76static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
77static int ip6gre_tunnel_init(struct net_device *dev);
78static void ip6gre_tunnel_setup(struct net_device *dev);
79static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
80static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
81
82/* Tunnel hash table */
83
84/*
85 4 hash tables:
86
87 3: (remote,local)
88 2: (remote,*)
89 1: (*,local)
90 0: (*,*)
91
92 We require exact key match i.e. if a key is present in packet
93 it will match only tunnel with the same key; if it is not present,
94 it will match only keyless tunnel.
95
96 All keysless packets, if not matched configured keyless tunnels
97 will match fallback tunnel.
98 */
99
100#define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(HASH_SIZE - 1))
101static u32 HASH_ADDR(const struct in6_addr *addr)
102{
103 u32 hash = ipv6_addr_hash(addr);
104
105 return hash_32(hash, HASH_SIZE_SHIFT);
106}
107
108#define tunnels_r_l tunnels[3]
109#define tunnels_r tunnels[2]
110#define tunnels_l tunnels[1]
111#define tunnels_wc tunnels[0]
c12b395a 112
c12b395a 113static struct rtnl_link_stats64 *ip6gre_get_stats64(struct net_device *dev,
114 struct rtnl_link_stats64 *tot)
115{
116 int i;
117
118 for_each_possible_cpu(i) {
119 const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
120 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
121 unsigned int start;
122
123 do {
124 start = u64_stats_fetch_begin_bh(&tstats->syncp);
125 rx_packets = tstats->rx_packets;
126 tx_packets = tstats->tx_packets;
127 rx_bytes = tstats->rx_bytes;
128 tx_bytes = tstats->tx_bytes;
129 } while (u64_stats_fetch_retry_bh(&tstats->syncp, start));
130
131 tot->rx_packets += rx_packets;
132 tot->tx_packets += tx_packets;
133 tot->rx_bytes += rx_bytes;
134 tot->tx_bytes += tx_bytes;
135 }
136
137 tot->multicast = dev->stats.multicast;
138 tot->rx_crc_errors = dev->stats.rx_crc_errors;
139 tot->rx_fifo_errors = dev->stats.rx_fifo_errors;
140 tot->rx_length_errors = dev->stats.rx_length_errors;
eccc1bb8 141 tot->rx_frame_errors = dev->stats.rx_frame_errors;
c12b395a 142 tot->rx_errors = dev->stats.rx_errors;
eccc1bb8 143
c12b395a 144 tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
145 tot->tx_carrier_errors = dev->stats.tx_carrier_errors;
146 tot->tx_dropped = dev->stats.tx_dropped;
147 tot->tx_aborted_errors = dev->stats.tx_aborted_errors;
148 tot->tx_errors = dev->stats.tx_errors;
149
150 return tot;
151}
152
153/* Given src, dst and key, find appropriate for input tunnel. */
154
155static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
156 const struct in6_addr *remote, const struct in6_addr *local,
157 __be32 key, __be16 gre_proto)
158{
159 struct net *net = dev_net(dev);
160 int link = dev->ifindex;
161 unsigned int h0 = HASH_ADDR(remote);
162 unsigned int h1 = HASH_KEY(key);
163 struct ip6_tnl *t, *cand = NULL;
164 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
165 int dev_type = (gre_proto == htons(ETH_P_TEB)) ?
166 ARPHRD_ETHER : ARPHRD_IP6GRE;
167 int score, cand_score = 4;
168
e086cadc 169 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
c12b395a 170 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
171 !ipv6_addr_equal(remote, &t->parms.raddr) ||
172 key != t->parms.i_key ||
173 !(t->dev->flags & IFF_UP))
174 continue;
175
176 if (t->dev->type != ARPHRD_IP6GRE &&
177 t->dev->type != dev_type)
178 continue;
179
180 score = 0;
181 if (t->parms.link != link)
182 score |= 1;
183 if (t->dev->type != dev_type)
184 score |= 2;
185 if (score == 0)
186 return t;
187
188 if (score < cand_score) {
189 cand = t;
190 cand_score = score;
191 }
192 }
193
e086cadc 194 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
c12b395a 195 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
196 key != t->parms.i_key ||
197 !(t->dev->flags & IFF_UP))
198 continue;
199
200 if (t->dev->type != ARPHRD_IP6GRE &&
201 t->dev->type != dev_type)
202 continue;
203
204 score = 0;
205 if (t->parms.link != link)
206 score |= 1;
207 if (t->dev->type != dev_type)
208 score |= 2;
209 if (score == 0)
210 return t;
211
212 if (score < cand_score) {
213 cand = t;
214 cand_score = score;
215 }
216 }
217
e086cadc 218 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
c12b395a 219 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
220 (!ipv6_addr_equal(local, &t->parms.raddr) ||
221 !ipv6_addr_is_multicast(local))) ||
222 key != t->parms.i_key ||
223 !(t->dev->flags & IFF_UP))
224 continue;
225
226 if (t->dev->type != ARPHRD_IP6GRE &&
227 t->dev->type != dev_type)
228 continue;
229
230 score = 0;
231 if (t->parms.link != link)
232 score |= 1;
233 if (t->dev->type != dev_type)
234 score |= 2;
235 if (score == 0)
236 return t;
237
238 if (score < cand_score) {
239 cand = t;
240 cand_score = score;
241 }
242 }
243
e086cadc 244 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
c12b395a 245 if (t->parms.i_key != key ||
246 !(t->dev->flags & IFF_UP))
247 continue;
248
249 if (t->dev->type != ARPHRD_IP6GRE &&
250 t->dev->type != dev_type)
251 continue;
252
253 score = 0;
254 if (t->parms.link != link)
255 score |= 1;
256 if (t->dev->type != dev_type)
257 score |= 2;
258 if (score == 0)
259 return t;
260
261 if (score < cand_score) {
262 cand = t;
263 cand_score = score;
264 }
265 }
266
267 if (cand != NULL)
268 return cand;
269
270 dev = ign->fb_tunnel_dev;
271 if (dev->flags & IFF_UP)
272 return netdev_priv(dev);
273
274 return NULL;
275}
276
277static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
278 const struct __ip6_tnl_parm *p)
279{
280 const struct in6_addr *remote = &p->raddr;
281 const struct in6_addr *local = &p->laddr;
282 unsigned int h = HASH_KEY(p->i_key);
283 int prio = 0;
284
285 if (!ipv6_addr_any(local))
286 prio |= 1;
287 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
288 prio |= 2;
289 h ^= HASH_ADDR(remote);
290 }
291
292 return &ign->tunnels[prio][h];
293}
294
295static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
296 const struct ip6_tnl *t)
297{
298 return __ip6gre_bucket(ign, &t->parms);
299}
300
301static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
302{
303 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
304
305 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
306 rcu_assign_pointer(*tp, t);
307}
308
309static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
310{
311 struct ip6_tnl __rcu **tp;
312 struct ip6_tnl *iter;
313
314 for (tp = ip6gre_bucket(ign, t);
315 (iter = rtnl_dereference(*tp)) != NULL;
316 tp = &iter->next) {
317 if (t == iter) {
318 rcu_assign_pointer(*tp, t->next);
319 break;
320 }
321 }
322}
323
324static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
325 const struct __ip6_tnl_parm *parms,
326 int type)
327{
328 const struct in6_addr *remote = &parms->raddr;
329 const struct in6_addr *local = &parms->laddr;
330 __be32 key = parms->i_key;
331 int link = parms->link;
332 struct ip6_tnl *t;
333 struct ip6_tnl __rcu **tp;
334 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
335
336 for (tp = __ip6gre_bucket(ign, parms);
337 (t = rtnl_dereference(*tp)) != NULL;
338 tp = &t->next)
339 if (ipv6_addr_equal(local, &t->parms.laddr) &&
340 ipv6_addr_equal(remote, &t->parms.raddr) &&
341 key == t->parms.i_key &&
342 link == t->parms.link &&
343 type == t->dev->type)
344 break;
345
346 return t;
347}
348
349static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
350 const struct __ip6_tnl_parm *parms, int create)
351{
352 struct ip6_tnl *t, *nt;
353 struct net_device *dev;
354 char name[IFNAMSIZ];
355 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
356
357 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
358 if (t || !create)
359 return t;
360
361 if (parms->name[0])
362 strlcpy(name, parms->name, IFNAMSIZ);
363 else
364 strcpy(name, "ip6gre%d");
365
366 dev = alloc_netdev(sizeof(*t), name, ip6gre_tunnel_setup);
367 if (!dev)
368 return NULL;
369
370 dev_net_set(dev, net);
371
372 nt = netdev_priv(dev);
373 nt->parms = *parms;
374 dev->rtnl_link_ops = &ip6gre_link_ops;
375
376 nt->dev = dev;
377 ip6gre_tnl_link_config(nt, 1);
378
379 if (register_netdevice(dev) < 0)
380 goto failed_free;
381
382 /* Can use a lockless transmit, unless we generate output sequences */
383 if (!(nt->parms.o_flags & GRE_SEQ))
384 dev->features |= NETIF_F_LLTX;
385
386 dev_hold(dev);
387 ip6gre_tunnel_link(ign, nt);
388 return nt;
389
390failed_free:
391 free_netdev(dev);
392 return NULL;
393}
394
395static void ip6gre_tunnel_uninit(struct net_device *dev)
396{
397 struct net *net = dev_net(dev);
398 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
399
400 ip6gre_tunnel_unlink(ign, netdev_priv(dev));
401 dev_put(dev);
402}
403
404
405static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
406 u8 type, u8 code, int offset, __be32 info)
407{
408 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
b87fb39e
ED		 409 __be16 *p = (__be16 *)(skb->data + offset);
410 int grehlen = offset + 4;
c12b395a 411 struct ip6_tnl *t;
412 __be16 flags;
413
414 flags = p[0];
415 if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) {
416 if (flags&(GRE_VERSION|GRE_ROUTING))
417 return;
418 if (flags&GRE_KEY) {
419 grehlen += 4;
420 if (flags&GRE_CSUM)
421 grehlen += 4;
422 }
423 }
424
425 /* If only 8 bytes returned, keyed message will be dropped here */
b87fb39e 426 if (!pskb_may_pull(skb, grehlen))
c12b395a 427 return;
b87fb39e
ED		 428 ipv6h = (const struct ipv6hdr *)skb->data;
429 p = (__be16 *)(skb->data + offset);
c12b395a 430
c12b395a 431 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
432 flags & GRE_KEY ?
433 *(((__be32 *)p) + (grehlen / 4) - 1) : 0,
434 p[1]);
435 if (t == NULL)
0c5794a6 436 return;
c12b395a 437
438 switch (type) {
439 __u32 teli;
440 struct ipv6_tlv_tnl_enc_lim *tel;
441 __u32 mtu;
442 case ICMPV6_DEST_UNREACH:
443 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
444 t->parms.name);
445 break;
446 case ICMPV6_TIME_EXCEED:
447 if (code == ICMPV6_EXC_HOPLIMIT) {
448 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
449 t->parms.name);
450 }
451 break;
452 case ICMPV6_PARAMPROB:
453 teli = 0;
454 if (code == ICMPV6_HDR_FIELD)
455 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
456
457 if (teli && teli == info - 2) {
458 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
459 if (tel->encap_limit == 0) {
460 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
461 t->parms.name);
462 }
463 } else {
464 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
465 t->parms.name);
466 }
467 break;
468 case ICMPV6_PKT_TOOBIG:
469 mtu = info - offset;
470 if (mtu < IPV6_MIN_MTU)
471 mtu = IPV6_MIN_MTU;
472 t->dev->mtu = mtu;
473 break;
474 }
475
476 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
477 t->err_count++;
478 else
479 t->err_count = 1;
480 t->err_time = jiffies;
c12b395a 481}
482
c12b395a 483static int ip6gre_rcv(struct sk_buff *skb)
484{
485 const struct ipv6hdr *ipv6h;
486 u8 *h;
487 __be16 flags;
488 __sum16 csum = 0;
489 __be32 key = 0;
490 u32 seqno = 0;
491 struct ip6_tnl *tunnel;
492 int offset = 4;
493 __be16 gre_proto;
eccc1bb8 494 int err;
c12b395a 495
496 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
0c5794a6 497 goto drop;
c12b395a 498
499 ipv6h = ipv6_hdr(skb);
500 h = skb->data;
501 flags = *(__be16 *)h;
502
503 if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) {
504 /* - Version must be 0.
505 - We do not support routing headers.
506 */
507 if (flags&(GRE_VERSION|GRE_ROUTING))
0c5794a6 508 goto drop;
c12b395a 509
510 if (flags&GRE_CSUM) {
511 switch (skb->ip_summed) {
512 case CHECKSUM_COMPLETE:
513 csum = csum_fold(skb->csum);
514 if (!csum)
515 break;
516 /* fall through */
517 case CHECKSUM_NONE:
518 skb->csum = 0;
519 csum = __skb_checksum_complete(skb);
520 skb->ip_summed = CHECKSUM_COMPLETE;
521 }
522 offset += 4;
523 }
524 if (flags&GRE_KEY) {
525 key = *(__be32 *)(h + offset);
526 offset += 4;
527 }
528 if (flags&GRE_SEQ) {
529 seqno = ntohl(*(__be32 *)(h + offset));
530 offset += 4;
531 }
532 }
533
534 gre_proto = *(__be16 *)(h + 2);
535
c12b395a 536 tunnel = ip6gre_tunnel_lookup(skb->dev,
537 &ipv6h->saddr, &ipv6h->daddr, key,
538 gre_proto);
539 if (tunnel) {
540 struct pcpu_tstats *tstats;
541
542 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
543 goto drop;
544
545 if (!ip6_tnl_rcv_ctl(tunnel, &ipv6h->daddr, &ipv6h->saddr)) {
546 tunnel->dev->stats.rx_dropped++;
547 goto drop;
548 }
549
550 secpath_reset(skb);
551
552 skb->protocol = gre_proto;
553 /* WCCP version 1 and 2 protocol decoding.
554 * - Change protocol to IP
555 * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
556 */
557 if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) {
558 skb->protocol = htons(ETH_P_IP);
559 if ((*(h + offset) & 0xF0) != 0x40)
560 offset += 4;
561 }
562
563 skb->mac_header = skb->network_header;
564 __pskb_pull(skb, offset);
565 skb_postpull_rcsum(skb, skb_transport_header(skb), offset);
566 skb->pkt_type = PACKET_HOST;
567
568 if (((flags&GRE_CSUM) && csum) ||
569 (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) {
570 tunnel->dev->stats.rx_crc_errors++;
571 tunnel->dev->stats.rx_errors++;
572 goto drop;
573 }
574 if (tunnel->parms.i_flags&GRE_SEQ) {
575 if (!(flags&GRE_SEQ) ||
576 (tunnel->i_seqno &&
577 (s32)(seqno - tunnel->i_seqno) < 0)) {
578 tunnel->dev->stats.rx_fifo_errors++;
579 tunnel->dev->stats.rx_errors++;
580 goto drop;
581 }
582 tunnel->i_seqno = seqno + 1;
583 }
584
585 /* Warning: All skb pointers will be invalidated! */
586 if (tunnel->dev->type == ARPHRD_ETHER) {
587 if (!pskb_may_pull(skb, ETH_HLEN)) {
588 tunnel->dev->stats.rx_length_errors++;
589 tunnel->dev->stats.rx_errors++;
590 goto drop;
591 }
592
593 ipv6h = ipv6_hdr(skb);
594 skb->protocol = eth_type_trans(skb, tunnel->dev);
595 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
596 }
597
eccc1bb8 598 __skb_tunnel_rx(skb, tunnel->dev);
599
600 skb_reset_network_header(skb);
601
602 err = IP6_ECN_decapsulate(ipv6h, skb);
603 if (unlikely(err)) {
604 if (log_ecn_error)
605 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
606 &ipv6h->saddr,
607 ipv6_get_dsfield(ipv6h));
608 if (err > 1) {
609 ++tunnel->dev->stats.rx_frame_errors;
610 ++tunnel->dev->stats.rx_errors;
611 goto drop;
612 }
613 }
614
c12b395a 615 tstats = this_cpu_ptr(tunnel->dev->tstats);
616 u64_stats_update_begin(&tstats->syncp);
617 tstats->rx_packets++;
618 tstats->rx_bytes += skb->len;
619 u64_stats_update_end(&tstats->syncp);
620
c12b395a 621 netif_rx(skb);
622
c12b395a 623 return 0;
624 }
625 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
626
627drop:
c12b395a 628 kfree_skb(skb);
629 return 0;
630}
631
632struct ipv6_tel_txoption {
633 struct ipv6_txoptions ops;
634 __u8 dst_opt[8];
635};
636
637static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
638{
639 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
640
641 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
642 opt->dst_opt[3] = 1;
643 opt->dst_opt[4] = encap_limit;
644 opt->dst_opt[5] = IPV6_TLV_PADN;
645 opt->dst_opt[6] = 1;
646
647 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
648 opt->ops.opt_nflen = 8;
649}
650
651static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
652 struct net_device *dev,
653 __u8 dsfield,
654 struct flowi6 *fl6,
655 int encap_limit,
656 __u32 *pmtu)
657{
658 struct net *net = dev_net(dev);
659 struct ip6_tnl *tunnel = netdev_priv(dev);
660 struct net_device *tdev; /* Device to other host */
661 struct ipv6hdr *ipv6h; /* Our new IP header */
662 unsigned int max_headroom; /* The extra header space needed */
663 int gre_hlen;
664 struct ipv6_tel_txoption opt;
665 int mtu;
666 struct dst_entry *dst = NULL, *ndst = NULL;
667 struct net_device_stats *stats = &tunnel->dev->stats;
668 int err = -1;
669 u8 proto;
670 int pkt_len;
671 struct sk_buff *new_skb;
672
673 if (dev->type == ARPHRD_ETHER)
674 IPCB(skb)->flags = 0;
675
676 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) {
677 gre_hlen = 0;
678 ipv6h = (struct ipv6hdr *)skb->data;
679 fl6->daddr = ipv6h->daddr;
680 } else {
681 gre_hlen = tunnel->hlen;
682 fl6->daddr = tunnel->parms.raddr;
683 }
684
685 if (!fl6->flowi6_mark)
686 dst = ip6_tnl_dst_check(tunnel);
687
688 if (!dst) {
689 ndst = ip6_route_output(net, NULL, fl6);
690
691 if (ndst->error)
692 goto tx_err_link_failure;
693 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
694 if (IS_ERR(ndst)) {
695 err = PTR_ERR(ndst);
696 ndst = NULL;
697 goto tx_err_link_failure;
698 }
699 dst = ndst;
700 }
701
702 tdev = dst->dev;
703
704 if (tdev == dev) {
705 stats->collisions++;
706 net_warn_ratelimited("%s: Local routing loop detected!\n",
707 tunnel->parms.name);
708 goto tx_err_dst_release;
709 }
710
711 mtu = dst_mtu(dst) - sizeof(*ipv6h);
712 if (encap_limit >= 0) {
713 max_headroom += 8;
714 mtu -= 8;
715 }
716 if (mtu < IPV6_MIN_MTU)
717 mtu = IPV6_MIN_MTU;
718 if (skb_dst(skb))
719 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
720 if (skb->len > mtu) {
721 *pmtu = mtu;
722 err = -EMSGSIZE;
723 goto tx_err_dst_release;
724 }
725
726 if (tunnel->err_count > 0) {
727 if (time_before(jiffies,
728 tunnel->err_time + IP6TUNNEL_ERR_TIMEO)) {
729 tunnel->err_count--;
730
731 dst_link_failure(skb);
732 } else
733 tunnel->err_count = 0;
734 }
735
736 max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len;
737
738 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
739 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
740 new_skb = skb_realloc_headroom(skb, max_headroom);
741 if (max_headroom > dev->needed_headroom)
742 dev->needed_headroom = max_headroom;
743 if (!new_skb)
744 goto tx_err_dst_release;
745
746 if (skb->sk)
747 skb_set_owner_w(new_skb, skb->sk);
748 consume_skb(skb);
749 skb = new_skb;
750 }
751
752 skb_dst_drop(skb);
753
754 if (fl6->flowi6_mark) {
755 skb_dst_set(skb, dst);
756 ndst = NULL;
757 } else {
758 skb_dst_set_noref(skb, dst);
759 }
760
c12b395a 761 proto = NEXTHDR_GRE;
762 if (encap_limit >= 0) {
763 init_tel_txopt(&opt, encap_limit);
764 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
765 }
766
767 skb_push(skb, gre_hlen);
768 skb_reset_network_header(skb);
ae782bb1 769 skb_set_transport_header(skb, sizeof(*ipv6h));
c12b395a 770
771 /*
772 * Push down and install the IP header.
773 */
774 ipv6h = ipv6_hdr(skb);
775 *(__be32 *)ipv6h = fl6->flowlabel | htonl(0x60000000);
776 dsfield = INET_ECN_encapsulate(0, dsfield);
777 ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield);
778 ipv6h->hop_limit = tunnel->parms.hop_limit;
779 ipv6h->nexthdr = proto;
780 ipv6h->saddr = fl6->saddr;
781 ipv6h->daddr = fl6->daddr;
782
783 ((__be16 *)(ipv6h + 1))[0] = tunnel->parms.o_flags;
784 ((__be16 *)(ipv6h + 1))[1] = (dev->type == ARPHRD_ETHER) ?
785 htons(ETH_P_TEB) : skb->protocol;
786
787 if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) {
788 __be32 *ptr = (__be32 *)(((u8 *)ipv6h) + tunnel->hlen - 4);
789
790 if (tunnel->parms.o_flags&GRE_SEQ) {
791 ++tunnel->o_seqno;
792 *ptr = htonl(tunnel->o_seqno);
793 ptr--;
794 }
795 if (tunnel->parms.o_flags&GRE_KEY) {
796 *ptr = tunnel->parms.o_key;
797 ptr--;
798 }
799 if (tunnel->parms.o_flags&GRE_CSUM) {
800 *ptr = 0;
801 *(__sum16 *)ptr = ip_compute_csum((void *)(ipv6h+1),
802 skb->len - sizeof(struct ipv6hdr));
803 }
804 }
805
806 nf_reset(skb);
807 pkt_len = skb->len;
808 err = ip6_local_out(skb);
809
810 if (net_xmit_eval(err) == 0) {
811 struct pcpu_tstats *tstats = this_cpu_ptr(tunnel->dev->tstats);
812
813 tstats->tx_bytes += pkt_len;
814 tstats->tx_packets++;
815 } else {
816 stats->tx_errors++;
817 stats->tx_aborted_errors++;
818 }
819
820 if (ndst)
821 ip6_tnl_dst_store(tunnel, ndst);
822
823 return 0;
824tx_err_link_failure:
825 stats->tx_carrier_errors++;
826 dst_link_failure(skb);
827tx_err_dst_release:
828 dst_release(ndst);
829 return err;
830}
831
832static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
833{
834 struct ip6_tnl *t = netdev_priv(dev);
835 const struct iphdr *iph = ip_hdr(skb);
836 int encap_limit = -1;
837 struct flowi6 fl6;
838 __u8 dsfield;
839 __u32 mtu;
840 int err;
841
842 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
843 encap_limit = t->parms.encap_limit;
844
845 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
846 fl6.flowi6_proto = IPPROTO_IPIP;
847
848 dsfield = ipv4_get_dsfield(iph);
849
850 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
851 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
852 & IPV6_TCLASS_MASK;
853 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
854 fl6.flowi6_mark = skb->mark;
855
856 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
857 if (err != 0) {
858 /* XXX: send ICMP error even if DF is not set. */
859 if (err == -EMSGSIZE)
860 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
861 htonl(mtu));
862 return -1;
863 }
864
865 return 0;
866}
867
868static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
869{
870 struct ip6_tnl *t = netdev_priv(dev);
871 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
872 int encap_limit = -1;
873 __u16 offset;
874 struct flowi6 fl6;
875 __u8 dsfield;
876 __u32 mtu;
877 int err;
878
879 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
880 return -1;
881
882 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
883 if (offset > 0) {
884 struct ipv6_tlv_tnl_enc_lim *tel;
885 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
886 if (tel->encap_limit == 0) {
887 icmpv6_send(skb, ICMPV6_PARAMPROB,
888 ICMPV6_HDR_FIELD, offset + 2);
889 return -1;
890 }
891 encap_limit = tel->encap_limit - 1;
892 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
893 encap_limit = t->parms.encap_limit;
894
895 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
896 fl6.flowi6_proto = IPPROTO_IPV6;
897
898 dsfield = ipv6_get_dsfield(ipv6h);
899 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
900 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
901 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
902 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK);
903 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
904 fl6.flowi6_mark = skb->mark;
905
906 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
907 if (err != 0) {
908 if (err == -EMSGSIZE)
909 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
910 return -1;
911 }
912
913 return 0;
914}
915
916/**
917 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
918 * @t: the outgoing tunnel device
919 * @hdr: IPv6 header from the incoming packet
920 *
921 * Description:
922 * Avoid trivial tunneling loop by checking that tunnel exit-point
923 * doesn't match source of incoming packet.
924 *
925 * Return:
926 * 1 if conflict,
927 * 0 else
928 **/
929
930static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
931 const struct ipv6hdr *hdr)
932{
933 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
934}
935
936static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
937{
938 struct ip6_tnl *t = netdev_priv(dev);
939 int encap_limit = -1;
940 struct flowi6 fl6;
941 __u32 mtu;
942 int err;
943
944 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
945 encap_limit = t->parms.encap_limit;
946
947 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
948 fl6.flowi6_proto = skb->protocol;
949
950 err = ip6gre_xmit2(skb, dev, 0, &fl6, encap_limit, &mtu);
951
952 return err;
953}
954
955static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
956 struct net_device *dev)
957{
958 struct ip6_tnl *t = netdev_priv(dev);
959 struct net_device_stats *stats = &t->dev->stats;
960 int ret;
961
962 if (!ip6_tnl_xmit_ctl(t))
963 return -1;
964
965 switch (skb->protocol) {
966 case htons(ETH_P_IP):
967 ret = ip6gre_xmit_ipv4(skb, dev);
968 break;
969 case htons(ETH_P_IPV6):
970 ret = ip6gre_xmit_ipv6(skb, dev);
971 break;
972 default:
973 ret = ip6gre_xmit_other(skb, dev);
974 break;
975 }
976
977 if (ret < 0)
978 goto tx_err;
979
980 return NETDEV_TX_OK;
981
982tx_err:
983 stats->tx_errors++;
984 stats->tx_dropped++;
985 kfree_skb(skb);
986 return NETDEV_TX_OK;
987}
988
989static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
990{
991 struct net_device *dev = t->dev;
992 struct __ip6_tnl_parm *p = &t->parms;
993 struct flowi6 *fl6 = &t->fl.u.ip6;
994 int addend = sizeof(struct ipv6hdr) + 4;
995
996 if (dev->type != ARPHRD_ETHER) {
997 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
998 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
999 }
1000
1001 /* Set up flowi template */
1002 fl6->saddr = p->laddr;
1003 fl6->daddr = p->raddr;
1004 fl6->flowi6_oif = p->link;
1005 fl6->flowlabel = 0;
1006
1007 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1008 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1009 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1010 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1011
1012 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1013 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1014
1015 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1016 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1017 dev->flags |= IFF_POINTOPOINT;
1018 else
1019 dev->flags &= ~IFF_POINTOPOINT;
1020
1021 dev->iflink = p->link;
1022
1023 /* Precalculate GRE options length */
1024 if (t->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) {
1025 if (t->parms.o_flags&GRE_CSUM)
1026 addend += 4;
1027 if (t->parms.o_flags&GRE_KEY)
1028 addend += 4;
1029 if (t->parms.o_flags&GRE_SEQ)
1030 addend += 4;
1031 }
1032
1033 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1034 int strict = (ipv6_addr_type(&p->raddr) &
1035 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1036
1037 struct rt6_info *rt = rt6_lookup(dev_net(dev),
1038 &p->raddr, &p->laddr,
1039 p->link, strict);
1040
1041 if (rt == NULL)
1042 return;
1043
1044 if (rt->dst.dev) {
1045 dev->hard_header_len = rt->dst.dev->hard_header_len + addend;
1046
1047 if (set_mtu) {
1048 dev->mtu = rt->dst.dev->mtu - addend;
1049 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1050 dev->mtu -= 8;
1051
1052 if (dev->mtu < IPV6_MIN_MTU)
1053 dev->mtu = IPV6_MIN_MTU;
1054 }
1055 }
94e187c0 1056 ip6_rt_put(rt);
c12b395a 1057 }
1058
1059 t->hlen = addend;
1060}
1061
1062static int ip6gre_tnl_change(struct ip6_tnl *t,
1063 const struct __ip6_tnl_parm *p, int set_mtu)
1064{
1065 t->parms.laddr = p->laddr;
1066 t->parms.raddr = p->raddr;
1067 t->parms.flags = p->flags;
1068 t->parms.hop_limit = p->hop_limit;
1069 t->parms.encap_limit = p->encap_limit;
1070 t->parms.flowinfo = p->flowinfo;
1071 t->parms.link = p->link;
1072 t->parms.proto = p->proto;
1073 t->parms.i_key = p->i_key;
1074 t->parms.o_key = p->o_key;
1075 t->parms.i_flags = p->i_flags;
1076 t->parms.o_flags = p->o_flags;
1077 ip6_tnl_dst_reset(t);
1078 ip6gre_tnl_link_config(t, set_mtu);
1079 return 0;
1080}
1081
1082static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1083 const struct ip6_tnl_parm2 *u)
1084{
1085 p->laddr = u->laddr;
1086 p->raddr = u->raddr;
1087 p->flags = u->flags;
1088 p->hop_limit = u->hop_limit;
1089 p->encap_limit = u->encap_limit;
1090 p->flowinfo = u->flowinfo;
1091 p->link = u->link;
1092 p->i_key = u->i_key;
1093 p->o_key = u->o_key;
1094 p->i_flags = u->i_flags;
1095 p->o_flags = u->o_flags;
1096 memcpy(p->name, u->name, sizeof(u->name));
1097}
1098
1099static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1100 const struct __ip6_tnl_parm *p)
1101{
1102 u->proto = IPPROTO_GRE;
1103 u->laddr = p->laddr;
1104 u->raddr = p->raddr;
1105 u->flags = p->flags;
1106 u->hop_limit = p->hop_limit;
1107 u->encap_limit = p->encap_limit;
1108 u->flowinfo = p->flowinfo;
1109 u->link = p->link;
1110 u->i_key = p->i_key;
1111 u->o_key = p->o_key;
1112 u->i_flags = p->i_flags;
1113 u->o_flags = p->o_flags;
1114 memcpy(u->name, p->name, sizeof(u->name));
1115}
1116
1117static int ip6gre_tunnel_ioctl(struct net_device *dev,
1118 struct ifreq *ifr, int cmd)
1119{
1120 int err = 0;
1121 struct ip6_tnl_parm2 p;
1122 struct __ip6_tnl_parm p1;
1123 struct ip6_tnl *t;
1124 struct net *net = dev_net(dev);
1125 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1126
1127 switch (cmd) {
1128 case SIOCGETTUNNEL:
1129 t = NULL;
1130 if (dev == ign->fb_tunnel_dev) {
1131 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1132 err = -EFAULT;
1133 break;
1134 }
1135 ip6gre_tnl_parm_from_user(&p1, &p);
1136 t = ip6gre_tunnel_locate(net, &p1, 0);
1137 }
1138 if (t == NULL)
1139 t = netdev_priv(dev);
1140 ip6gre_tnl_parm_to_user(&p, &t->parms);
1141 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1142 err = -EFAULT;
1143 break;
1144
1145 case SIOCADDTUNNEL:
1146 case SIOCCHGTUNNEL:
1147 err = -EPERM;
af31f412 1148 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
c12b395a 1149 goto done;
1150
1151 err = -EFAULT;
1152 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1153 goto done;
1154
1155 err = -EINVAL;
1156 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1157 goto done;
1158
1159 if (!(p.i_flags&GRE_KEY))
1160 p.i_key = 0;
1161 if (!(p.o_flags&GRE_KEY))
1162 p.o_key = 0;
1163
1164 ip6gre_tnl_parm_from_user(&p1, &p);
1165 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1166
1167 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1168 if (t != NULL) {
1169 if (t->dev != dev) {
1170 err = -EEXIST;
1171 break;
1172 }
1173 } else {
1174 t = netdev_priv(dev);
1175
1176 ip6gre_tunnel_unlink(ign, t);
1177 synchronize_net();
1178 ip6gre_tnl_change(t, &p1, 1);
1179 ip6gre_tunnel_link(ign, t);
1180 netdev_state_change(dev);
1181 }
1182 }
1183
1184 if (t) {
1185 err = 0;
1186
1187 ip6gre_tnl_parm_to_user(&p, &t->parms);
1188 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1189 err = -EFAULT;
1190 } else
1191 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1192 break;
1193
1194 case SIOCDELTUNNEL:
1195 err = -EPERM;
af31f412 1196 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
c12b395a 1197 goto done;
1198
1199 if (dev == ign->fb_tunnel_dev) {
1200 err = -EFAULT;
1201 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1202 goto done;
1203 err = -ENOENT;
1204 ip6gre_tnl_parm_from_user(&p1, &p);
1205 t = ip6gre_tunnel_locate(net, &p1, 0);
1206 if (t == NULL)
1207 goto done;
1208 err = -EPERM;
1209 if (t == netdev_priv(ign->fb_tunnel_dev))
1210 goto done;
1211 dev = t->dev;
1212 }
1213 unregister_netdevice(dev);
1214 err = 0;
1215 break;
1216
1217 default:
1218 err = -EINVAL;
1219 }
1220
1221done:
1222 return err;
1223}
1224
1225static int ip6gre_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1226{
1227 struct ip6_tnl *tunnel = netdev_priv(dev);
1228 if (new_mtu < 68 ||
1229 new_mtu > 0xFFF8 - dev->hard_header_len - tunnel->hlen)
1230 return -EINVAL;
1231 dev->mtu = new_mtu;
1232 return 0;
1233}
1234
1235static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1236 unsigned short type,
1237 const void *daddr, const void *saddr, unsigned int len)
1238{
1239 struct ip6_tnl *t = netdev_priv(dev);
1240 struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen);
1241 __be16 *p = (__be16 *)(ipv6h+1);
1242
1243 *(__be32 *)ipv6h = t->fl.u.ip6.flowlabel | htonl(0x60000000);
1244 ipv6h->hop_limit = t->parms.hop_limit;
1245 ipv6h->nexthdr = NEXTHDR_GRE;
1246 ipv6h->saddr = t->parms.laddr;
1247 ipv6h->daddr = t->parms.raddr;
1248
1249 p[0] = t->parms.o_flags;
1250 p[1] = htons(type);
1251
1252 /*
1253 * Set the source hardware address.
1254 */
1255
1256 if (saddr)
1257 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1258 if (daddr)
1259 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1260 if (!ipv6_addr_any(&ipv6h->daddr))
1261 return t->hlen;
1262
1263 return -t->hlen;
1264}
1265
c12b395a 1266static const struct header_ops ip6gre_header_ops = {
1267 .create = ip6gre_header,
c12b395a 1268};
1269
1270static const struct net_device_ops ip6gre_netdev_ops = {
1271 .ndo_init = ip6gre_tunnel_init,
1272 .ndo_uninit = ip6gre_tunnel_uninit,
1273 .ndo_start_xmit = ip6gre_tunnel_xmit,
1274 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1275 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1276 .ndo_get_stats64 = ip6gre_get_stats64,
1277};
1278
1279static void ip6gre_dev_free(struct net_device *dev)
1280{
1281 free_percpu(dev->tstats);
1282 free_netdev(dev);
1283}
1284
1285static void ip6gre_tunnel_setup(struct net_device *dev)
1286{
1287 struct ip6_tnl *t;
1288
1289 dev->netdev_ops = &ip6gre_netdev_ops;
1290 dev->destructor = ip6gre_dev_free;
1291
1292 dev->type = ARPHRD_IP6GRE;
1293 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr) + 4;
1294 dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr) - 4;
1295 t = netdev_priv(dev);
1296 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1297 dev->mtu -= 8;
1298 dev->flags |= IFF_NOARP;
1299 dev->iflink = 0;
1300 dev->addr_len = sizeof(struct in6_addr);
1301 dev->features |= NETIF_F_NETNS_LOCAL;
1302 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1303}
1304
1305static int ip6gre_tunnel_init(struct net_device *dev)
1306{
1307 struct ip6_tnl *tunnel;
1308
1309 tunnel = netdev_priv(dev);
1310
1311 tunnel->dev = dev;
1312 strcpy(tunnel->parms.name, dev->name);
1313
1314 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1315 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1316
1317 if (ipv6_addr_any(&tunnel->parms.raddr))
1318 dev->header_ops = &ip6gre_header_ops;
1319
1320 dev->tstats = alloc_percpu(struct pcpu_tstats);
1321 if (!dev->tstats)
1322 return -ENOMEM;
1323
1324 return 0;
1325}
1326
1327static void ip6gre_fb_tunnel_init(struct net_device *dev)
1328{
1329 struct ip6_tnl *tunnel = netdev_priv(dev);
1330
1331 tunnel->dev = dev;
1332 strcpy(tunnel->parms.name, dev->name);
1333
1334 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1335
1336 dev_hold(dev);
1337}
1338
1339
1340static struct inet6_protocol ip6gre_protocol __read_mostly = {
1341 .handler = ip6gre_rcv,
1342 .err_handler = ip6gre_err,
1343 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1344};
1345
1346static void ip6gre_destroy_tunnels(struct ip6gre_net *ign,
1347 struct list_head *head)
1348{
1349 int prio;
1350
1351 for (prio = 0; prio < 4; prio++) {
1352 int h;
1353 for (h = 0; h < HASH_SIZE; h++) {
1354 struct ip6_tnl *t;
1355
1356 t = rtnl_dereference(ign->tunnels[prio][h]);
1357
1358 while (t != NULL) {
1359 unregister_netdevice_queue(t->dev, head);
1360 t = rtnl_dereference(t->next);
1361 }
1362 }
1363 }
1364}
1365
1366static int __net_init ip6gre_init_net(struct net *net)
1367{
1368 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1369 int err;
1370
1371 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1372 ip6gre_tunnel_setup);
1373 if (!ign->fb_tunnel_dev) {
1374 err = -ENOMEM;
1375 goto err_alloc_dev;
1376 }
1377 dev_net_set(ign->fb_tunnel_dev, net);
1378
1379 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1380 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1381
1382 err = register_netdev(ign->fb_tunnel_dev);
1383 if (err)
1384 goto err_reg_dev;
1385
1386 rcu_assign_pointer(ign->tunnels_wc[0],
1387 netdev_priv(ign->fb_tunnel_dev));
1388 return 0;
1389
1390err_reg_dev:
1391 ip6gre_dev_free(ign->fb_tunnel_dev);
1392err_alloc_dev:
1393 return err;
1394}
1395
1396static void __net_exit ip6gre_exit_net(struct net *net)
1397{
1398 struct ip6gre_net *ign;
1399 LIST_HEAD(list);
1400
1401 ign = net_generic(net, ip6gre_net_id);
1402 rtnl_lock();
1403 ip6gre_destroy_tunnels(ign, &list);
1404 unregister_netdevice_many(&list);
1405 rtnl_unlock();
1406}
1407
1408static struct pernet_operations ip6gre_net_ops = {
1409 .init = ip6gre_init_net,
1410 .exit = ip6gre_exit_net,
1411 .id = &ip6gre_net_id,
1412 .size = sizeof(struct ip6gre_net),
1413};
1414
1415static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
1416{
1417 __be16 flags;
1418
1419 if (!data)
1420 return 0;
1421
1422 flags = 0;
1423 if (data[IFLA_GRE_IFLAGS])
1424 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1425 if (data[IFLA_GRE_OFLAGS])
1426 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1427 if (flags & (GRE_VERSION|GRE_ROUTING))
1428 return -EINVAL;
1429
1430 return 0;
1431}
1432
1433static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
1434{
1435 struct in6_addr daddr;
1436
1437 if (tb[IFLA_ADDRESS]) {
1438 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1439 return -EINVAL;
1440 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1441 return -EADDRNOTAVAIL;
1442 }
1443
1444 if (!data)
1445 goto out;
1446
1447 if (data[IFLA_GRE_REMOTE]) {
1448 nla_memcpy(&daddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1449 if (ipv6_addr_any(&daddr))
1450 return -EINVAL;
1451 }
1452
1453out:
1454 return ip6gre_tunnel_validate(tb, data);
1455}
1456
1457
1458static void ip6gre_netlink_parms(struct nlattr *data[],
1459 struct __ip6_tnl_parm *parms)
1460{
1461 memset(parms, 0, sizeof(*parms));
1462
1463 if (!data)
1464 return;
1465
1466 if (data[IFLA_GRE_LINK])
1467 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1468
1469 if (data[IFLA_GRE_IFLAGS])
1470 parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]);
1471
1472 if (data[IFLA_GRE_OFLAGS])
1473 parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]);
1474
1475 if (data[IFLA_GRE_IKEY])
1476 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1477
1478 if (data[IFLA_GRE_OKEY])
1479 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1480
1481 if (data[IFLA_GRE_LOCAL])
1482 nla_memcpy(&parms->laddr, data[IFLA_GRE_LOCAL], sizeof(struct in6_addr));
1483
1484 if (data[IFLA_GRE_REMOTE])
1485 nla_memcpy(&parms->raddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1486
1487 if (data[IFLA_GRE_TTL])
1488 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1489
1490 if (data[IFLA_GRE_ENCAP_LIMIT])
1491 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1492
1493 if (data[IFLA_GRE_FLOWINFO])
1494 parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]);
1495
1496 if (data[IFLA_GRE_FLAGS])
1497 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1498}
1499
1500static int ip6gre_tap_init(struct net_device *dev)
1501{
1502 struct ip6_tnl *tunnel;
1503
1504 tunnel = netdev_priv(dev);
1505
1506 tunnel->dev = dev;
1507 strcpy(tunnel->parms.name, dev->name);
1508
1509 ip6gre_tnl_link_config(tunnel, 1);
1510
1511 dev->tstats = alloc_percpu(struct pcpu_tstats);
1512 if (!dev->tstats)
1513 return -ENOMEM;
1514
1515 return 0;
1516}
1517
1518static const struct net_device_ops ip6gre_tap_netdev_ops = {
1519 .ndo_init = ip6gre_tap_init,
1520 .ndo_uninit = ip6gre_tunnel_uninit,
1521 .ndo_start_xmit = ip6gre_tunnel_xmit,
1522 .ndo_set_mac_address = eth_mac_addr,
1523 .ndo_validate_addr = eth_validate_addr,
1524 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1525 .ndo_get_stats64 = ip6gre_get_stats64,
1526};
1527
1528static void ip6gre_tap_setup(struct net_device *dev)
1529{
1530
1531 ether_setup(dev);
1532
1533 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1534 dev->destructor = ip6gre_dev_free;
1535
1536 dev->iflink = 0;
1537 dev->features |= NETIF_F_NETNS_LOCAL;
1538}
1539
1540static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1541 struct nlattr *tb[], struct nlattr *data[])
1542{
1543 struct ip6_tnl *nt;
1544 struct net *net = dev_net(dev);
1545 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1546 int err;
1547
1548 nt = netdev_priv(dev);
1549 ip6gre_netlink_parms(data, &nt->parms);
1550
1551 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1552 return -EEXIST;
1553
1554 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1555 eth_hw_addr_random(dev);
1556
1557 nt->dev = dev;
1558 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1559
1560 /* Can use a lockless transmit, unless we generate output sequences */
1561 if (!(nt->parms.o_flags & GRE_SEQ))
1562 dev->features |= NETIF_F_LLTX;
1563
1564 err = register_netdevice(dev);
1565 if (err)
1566 goto out;
1567
1568 dev_hold(dev);
1569 ip6gre_tunnel_link(ign, nt);
1570
1571out:
1572 return err;
1573}
1574
1575static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1576 struct nlattr *data[])
1577{
1578 struct ip6_tnl *t, *nt;
1579 struct net *net = dev_net(dev);
1580 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1581 struct __ip6_tnl_parm p;
1582
1583 if (dev == ign->fb_tunnel_dev)
1584 return -EINVAL;
1585
1586 nt = netdev_priv(dev);
1587 ip6gre_netlink_parms(data, &p);
1588
1589 t = ip6gre_tunnel_locate(net, &p, 0);
1590
1591 if (t) {
1592 if (t->dev != dev)
1593 return -EEXIST;
1594 } else {
1595 t = nt;
1596
1597 ip6gre_tunnel_unlink(ign, t);
1598 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1599 ip6gre_tunnel_link(ign, t);
1600 netdev_state_change(dev);
1601 }
1602
1603 return 0;
1604}
1605
1606static size_t ip6gre_get_size(const struct net_device *dev)
1607{
1608 return
1609 /* IFLA_GRE_LINK */
1610 nla_total_size(4) +
1611 /* IFLA_GRE_IFLAGS */
1612 nla_total_size(2) +
1613 /* IFLA_GRE_OFLAGS */
1614 nla_total_size(2) +
1615 /* IFLA_GRE_IKEY */
1616 nla_total_size(4) +
1617 /* IFLA_GRE_OKEY */
1618 nla_total_size(4) +
1619 /* IFLA_GRE_LOCAL */
a3754133 1620 nla_total_size(sizeof(struct in6_addr)) +
c12b395a 1621 /* IFLA_GRE_REMOTE */
a3754133 1622 nla_total_size(sizeof(struct in6_addr)) +
c12b395a 1623 /* IFLA_GRE_TTL */
1624 nla_total_size(1) +
1625 /* IFLA_GRE_TOS */
1626 nla_total_size(1) +
1627 /* IFLA_GRE_ENCAP_LIMIT */
1628 nla_total_size(1) +
1629 /* IFLA_GRE_FLOWINFO */
1630 nla_total_size(4) +
1631 /* IFLA_GRE_FLAGS */
1632 nla_total_size(4) +
1633 0;
1634}
1635
1636static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1637{
1638 struct ip6_tnl *t = netdev_priv(dev);
1639 struct __ip6_tnl_parm *p = &t->parms;
1640
1641 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1642 nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) ||
1643 nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) ||
1644 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1645 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
a3754133
ND		 1646 nla_put(skb, IFLA_GRE_LOCAL, sizeof(struct in6_addr), &p->laddr) ||
1647 nla_put(skb, IFLA_GRE_REMOTE, sizeof(struct in6_addr), &p->raddr) ||
c12b395a 1648 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1649 /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/
1650 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1651 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1652 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags))
1653 goto nla_put_failure;
1654 return 0;
1655
1656nla_put_failure:
1657 return -EMSGSIZE;
1658}
1659
1660static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1661 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1662 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1663 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1664 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1665 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1666 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1667 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1668 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1669 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1670 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1671 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1672};
1673
1674static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1675 .kind = "ip6gre",
1676 .maxtype = IFLA_GRE_MAX,
1677 .policy = ip6gre_policy,
1678 .priv_size = sizeof(struct ip6_tnl),
1679 .setup = ip6gre_tunnel_setup,
1680 .validate = ip6gre_tunnel_validate,
1681 .newlink = ip6gre_newlink,
1682 .changelink = ip6gre_changelink,
1683 .get_size = ip6gre_get_size,
1684 .fill_info = ip6gre_fill_info,
1685};
1686
1687static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1688 .kind = "ip6gretap",
1689 .maxtype = IFLA_GRE_MAX,
1690 .policy = ip6gre_policy,
1691 .priv_size = sizeof(struct ip6_tnl),
1692 .setup = ip6gre_tap_setup,
1693 .validate = ip6gre_tap_validate,
1694 .newlink = ip6gre_newlink,
1695 .changelink = ip6gre_changelink,
1696 .get_size = ip6gre_get_size,
1697 .fill_info = ip6gre_fill_info,
1698};
1699
1700/*
1701 * And now the modules code and kernel interface.
1702 */
1703
1704static int __init ip6gre_init(void)
1705{
1706 int err;
1707
1708 pr_info("GRE over IPv6 tunneling driver\n");
1709
1710 err = register_pernet_device(&ip6gre_net_ops);
1711 if (err < 0)
1712 return err;
1713
1714 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1715 if (err < 0) {
1716 pr_info("%s: can't add protocol\n", __func__);
1717 goto add_proto_failed;
1718 }
1719
1720 err = rtnl_link_register(&ip6gre_link_ops);
1721 if (err < 0)
1722 goto rtnl_link_failed;
1723
1724 err = rtnl_link_register(&ip6gre_tap_ops);
1725 if (err < 0)
1726 goto tap_ops_failed;
1727
1728out:
1729 return err;
1730
1731tap_ops_failed:
1732 rtnl_link_unregister(&ip6gre_link_ops);
1733rtnl_link_failed:
1734 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1735add_proto_failed:
1736 unregister_pernet_device(&ip6gre_net_ops);
1737 goto out;
1738}
1739
1740static void __exit ip6gre_fini(void)
1741{
1742 rtnl_link_unregister(&ip6gre_tap_ops);
1743 rtnl_link_unregister(&ip6gre_link_ops);
1744 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1745 unregister_pernet_device(&ip6gre_net_ops);
1746}
1747
1748module_init(ip6gre_init);
1749module_exit(ip6gre_fini);
1750MODULE_LICENSE("GPL");
1751MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1752MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1753MODULE_ALIAS_RTNL_LINK("ip6gre");
1754MODULE_ALIAS_NETDEV("ip6gre0");
Linux kernel - Deliverables
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