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net: Print functions in /proc/net/ptype without the offset.
[deliverable/linux.git] / net / ipv6 / ip6_gre.c
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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;
c12b395a 670 struct sk_buff *new_skb;
671
672 if (dev->type == ARPHRD_ETHER)
673 IPCB(skb)->flags = 0;
674
675 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) {
676 gre_hlen = 0;
677 ipv6h = (struct ipv6hdr *)skb->data;
678 fl6->daddr = ipv6h->daddr;
679 } else {
680 gre_hlen = tunnel->hlen;
681 fl6->daddr = tunnel->parms.raddr;
682 }
683
684 if (!fl6->flowi6_mark)
685 dst = ip6_tnl_dst_check(tunnel);
686
687 if (!dst) {
688 ndst = ip6_route_output(net, NULL, fl6);
689
690 if (ndst->error)
691 goto tx_err_link_failure;
692 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
693 if (IS_ERR(ndst)) {
694 err = PTR_ERR(ndst);
695 ndst = NULL;
696 goto tx_err_link_failure;
697 }
698 dst = ndst;
699 }
700
701 tdev = dst->dev;
702
703 if (tdev == dev) {
704 stats->collisions++;
705 net_warn_ratelimited("%s: Local routing loop detected!\n",
706 tunnel->parms.name);
707 goto tx_err_dst_release;
708 }
709
710 mtu = dst_mtu(dst) - sizeof(*ipv6h);
711 if (encap_limit >= 0) {
712 max_headroom += 8;
713 mtu -= 8;
714 }
715 if (mtu < IPV6_MIN_MTU)
716 mtu = IPV6_MIN_MTU;
717 if (skb_dst(skb))
718 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
719 if (skb->len > mtu) {
720 *pmtu = mtu;
721 err = -EMSGSIZE;
722 goto tx_err_dst_release;
723 }
724
725 if (tunnel->err_count > 0) {
726 if (time_before(jiffies,
727 tunnel->err_time + IP6TUNNEL_ERR_TIMEO)) {
728 tunnel->err_count--;
729
730 dst_link_failure(skb);
731 } else
732 tunnel->err_count = 0;
733 }
734
735 max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len;
736
737 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
738 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
739 new_skb = skb_realloc_headroom(skb, max_headroom);
740 if (max_headroom > dev->needed_headroom)
741 dev->needed_headroom = max_headroom;
742 if (!new_skb)
743 goto tx_err_dst_release;
744
745 if (skb->sk)
746 skb_set_owner_w(new_skb, skb->sk);
747 consume_skb(skb);
748 skb = new_skb;
749 }
750
751 skb_dst_drop(skb);
752
753 if (fl6->flowi6_mark) {
754 skb_dst_set(skb, dst);
755 ndst = NULL;
756 } else {
757 skb_dst_set_noref(skb, dst);
758 }
759
c12b395a 760 proto = NEXTHDR_GRE;
761 if (encap_limit >= 0) {
762 init_tel_txopt(&opt, encap_limit);
763 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
764 }
765
766 skb_push(skb, gre_hlen);
767 skb_reset_network_header(skb);
ae782bb1 768 skb_set_transport_header(skb, sizeof(*ipv6h));
c12b395a 769
770 /*
771 * Push down and install the IP header.
772 */
773 ipv6h = ipv6_hdr(skb);
3e4e4c1f 774 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), fl6->flowlabel);
c12b395a 775 ipv6h->hop_limit = tunnel->parms.hop_limit;
776 ipv6h->nexthdr = proto;
777 ipv6h->saddr = fl6->saddr;
778 ipv6h->daddr = fl6->daddr;
779
780 ((__be16 *)(ipv6h + 1))[0] = tunnel->parms.o_flags;
781 ((__be16 *)(ipv6h + 1))[1] = (dev->type == ARPHRD_ETHER) ?
782 htons(ETH_P_TEB) : skb->protocol;
783
784 if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) {
785 __be32 *ptr = (__be32 *)(((u8 *)ipv6h) + tunnel->hlen - 4);
786
787 if (tunnel->parms.o_flags&GRE_SEQ) {
788 ++tunnel->o_seqno;
789 *ptr = htonl(tunnel->o_seqno);
790 ptr--;
791 }
792 if (tunnel->parms.o_flags&GRE_KEY) {
793 *ptr = tunnel->parms.o_key;
794 ptr--;
795 }
796 if (tunnel->parms.o_flags&GRE_CSUM) {
797 *ptr = 0;
798 *(__sum16 *)ptr = ip_compute_csum((void *)(ipv6h+1),
799 skb->len - sizeof(struct ipv6hdr));
800 }
801 }
802
e8f72ea4 803 ip6tunnel_xmit(skb, dev);
c12b395a 804 if (ndst)
805 ip6_tnl_dst_store(tunnel, ndst);
c12b395a 806 return 0;
807tx_err_link_failure:
808 stats->tx_carrier_errors++;
809 dst_link_failure(skb);
810tx_err_dst_release:
811 dst_release(ndst);
812 return err;
813}
814
815static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
816{
817 struct ip6_tnl *t = netdev_priv(dev);
818 const struct iphdr *iph = ip_hdr(skb);
819 int encap_limit = -1;
820 struct flowi6 fl6;
821 __u8 dsfield;
822 __u32 mtu;
823 int err;
824
825 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
826 encap_limit = t->parms.encap_limit;
827
828 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
829 fl6.flowi6_proto = IPPROTO_IPIP;
830
831 dsfield = ipv4_get_dsfield(iph);
832
833 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
834 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
835 & IPV6_TCLASS_MASK;
836 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
837 fl6.flowi6_mark = skb->mark;
838
839 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
840 if (err != 0) {
841 /* XXX: send ICMP error even if DF is not set. */
842 if (err == -EMSGSIZE)
843 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
844 htonl(mtu));
845 return -1;
846 }
847
848 return 0;
849}
850
851static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
852{
853 struct ip6_tnl *t = netdev_priv(dev);
854 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
855 int encap_limit = -1;
856 __u16 offset;
857 struct flowi6 fl6;
858 __u8 dsfield;
859 __u32 mtu;
860 int err;
861
862 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
863 return -1;
864
865 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
866 if (offset > 0) {
867 struct ipv6_tlv_tnl_enc_lim *tel;
868 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
869 if (tel->encap_limit == 0) {
870 icmpv6_send(skb, ICMPV6_PARAMPROB,
871 ICMPV6_HDR_FIELD, offset + 2);
872 return -1;
873 }
874 encap_limit = tel->encap_limit - 1;
875 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
876 encap_limit = t->parms.encap_limit;
877
878 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
879 fl6.flowi6_proto = IPPROTO_IPV6;
880
881 dsfield = ipv6_get_dsfield(ipv6h);
882 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
883 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
884 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
885 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK);
886 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
887 fl6.flowi6_mark = skb->mark;
888
889 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
890 if (err != 0) {
891 if (err == -EMSGSIZE)
892 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
893 return -1;
894 }
895
896 return 0;
897}
898
899/**
900 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
901 * @t: the outgoing tunnel device
902 * @hdr: IPv6 header from the incoming packet
903 *
904 * Description:
905 * Avoid trivial tunneling loop by checking that tunnel exit-point
906 * doesn't match source of incoming packet.
907 *
908 * Return:
909 * 1 if conflict,
910 * 0 else
911 **/
912
913static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
914 const struct ipv6hdr *hdr)
915{
916 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
917}
918
919static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
920{
921 struct ip6_tnl *t = netdev_priv(dev);
922 int encap_limit = -1;
923 struct flowi6 fl6;
924 __u32 mtu;
925 int err;
926
927 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
928 encap_limit = t->parms.encap_limit;
929
930 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
931 fl6.flowi6_proto = skb->protocol;
932
933 err = ip6gre_xmit2(skb, dev, 0, &fl6, encap_limit, &mtu);
934
935 return err;
936}
937
938static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
939 struct net_device *dev)
940{
941 struct ip6_tnl *t = netdev_priv(dev);
942 struct net_device_stats *stats = &t->dev->stats;
943 int ret;
944
945 if (!ip6_tnl_xmit_ctl(t))
41ab3e31 946 goto tx_err;
c12b395a 947
948 switch (skb->protocol) {
949 case htons(ETH_P_IP):
950 ret = ip6gre_xmit_ipv4(skb, dev);
951 break;
952 case htons(ETH_P_IPV6):
953 ret = ip6gre_xmit_ipv6(skb, dev);
954 break;
955 default:
956 ret = ip6gre_xmit_other(skb, dev);
957 break;
958 }
959
960 if (ret < 0)
961 goto tx_err;
962
963 return NETDEV_TX_OK;
964
965tx_err:
966 stats->tx_errors++;
967 stats->tx_dropped++;
968 kfree_skb(skb);
969 return NETDEV_TX_OK;
970}
971
972static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
973{
974 struct net_device *dev = t->dev;
975 struct __ip6_tnl_parm *p = &t->parms;
976 struct flowi6 *fl6 = &t->fl.u.ip6;
977 int addend = sizeof(struct ipv6hdr) + 4;
978
979 if (dev->type != ARPHRD_ETHER) {
980 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
981 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
982 }
983
984 /* Set up flowi template */
985 fl6->saddr = p->laddr;
986 fl6->daddr = p->raddr;
987 fl6->flowi6_oif = p->link;
988 fl6->flowlabel = 0;
989
990 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
991 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
992 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
993 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
994
995 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
996 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
997
998 if (p->flags&IP6_TNL_F_CAP_XMIT &&
999 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1000 dev->flags |= IFF_POINTOPOINT;
1001 else
1002 dev->flags &= ~IFF_POINTOPOINT;
1003
1004 dev->iflink = p->link;
1005
1006 /* Precalculate GRE options length */
1007 if (t->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) {
1008 if (t->parms.o_flags&GRE_CSUM)
1009 addend += 4;
1010 if (t->parms.o_flags&GRE_KEY)
1011 addend += 4;
1012 if (t->parms.o_flags&GRE_SEQ)
1013 addend += 4;
1014 }
1015
1016 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1017 int strict = (ipv6_addr_type(&p->raddr) &
1018 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1019
1020 struct rt6_info *rt = rt6_lookup(dev_net(dev),
1021 &p->raddr, &p->laddr,
1022 p->link, strict);
1023
1024 if (rt == NULL)
1025 return;
1026
1027 if (rt->dst.dev) {
1028 dev->hard_header_len = rt->dst.dev->hard_header_len + addend;
1029
1030 if (set_mtu) {
1031 dev->mtu = rt->dst.dev->mtu - addend;
1032 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1033 dev->mtu -= 8;
1034
1035 if (dev->mtu < IPV6_MIN_MTU)
1036 dev->mtu = IPV6_MIN_MTU;
1037 }
1038 }
94e187c0 1039 ip6_rt_put(rt);
c12b395a 1040 }
1041
1042 t->hlen = addend;
1043}
1044
1045static int ip6gre_tnl_change(struct ip6_tnl *t,
1046 const struct __ip6_tnl_parm *p, int set_mtu)
1047{
1048 t->parms.laddr = p->laddr;
1049 t->parms.raddr = p->raddr;
1050 t->parms.flags = p->flags;
1051 t->parms.hop_limit = p->hop_limit;
1052 t->parms.encap_limit = p->encap_limit;
1053 t->parms.flowinfo = p->flowinfo;
1054 t->parms.link = p->link;
1055 t->parms.proto = p->proto;
1056 t->parms.i_key = p->i_key;
1057 t->parms.o_key = p->o_key;
1058 t->parms.i_flags = p->i_flags;
1059 t->parms.o_flags = p->o_flags;
1060 ip6_tnl_dst_reset(t);
1061 ip6gre_tnl_link_config(t, set_mtu);
1062 return 0;
1063}
1064
1065static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1066 const struct ip6_tnl_parm2 *u)
1067{
1068 p->laddr = u->laddr;
1069 p->raddr = u->raddr;
1070 p->flags = u->flags;
1071 p->hop_limit = u->hop_limit;
1072 p->encap_limit = u->encap_limit;
1073 p->flowinfo = u->flowinfo;
1074 p->link = u->link;
1075 p->i_key = u->i_key;
1076 p->o_key = u->o_key;
1077 p->i_flags = u->i_flags;
1078 p->o_flags = u->o_flags;
1079 memcpy(p->name, u->name, sizeof(u->name));
1080}
1081
1082static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1083 const struct __ip6_tnl_parm *p)
1084{
1085 u->proto = IPPROTO_GRE;
1086 u->laddr = p->laddr;
1087 u->raddr = p->raddr;
1088 u->flags = p->flags;
1089 u->hop_limit = p->hop_limit;
1090 u->encap_limit = p->encap_limit;
1091 u->flowinfo = p->flowinfo;
1092 u->link = p->link;
1093 u->i_key = p->i_key;
1094 u->o_key = p->o_key;
1095 u->i_flags = p->i_flags;
1096 u->o_flags = p->o_flags;
1097 memcpy(u->name, p->name, sizeof(u->name));
1098}
1099
1100static int ip6gre_tunnel_ioctl(struct net_device *dev,
1101 struct ifreq *ifr, int cmd)
1102{
1103 int err = 0;
1104 struct ip6_tnl_parm2 p;
1105 struct __ip6_tnl_parm p1;
1106 struct ip6_tnl *t;
1107 struct net *net = dev_net(dev);
1108 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1109
1110 switch (cmd) {
1111 case SIOCGETTUNNEL:
1112 t = NULL;
1113 if (dev == ign->fb_tunnel_dev) {
1114 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1115 err = -EFAULT;
1116 break;
1117 }
1118 ip6gre_tnl_parm_from_user(&p1, &p);
1119 t = ip6gre_tunnel_locate(net, &p1, 0);
1120 }
1121 if (t == NULL)
1122 t = netdev_priv(dev);
1123 ip6gre_tnl_parm_to_user(&p, &t->parms);
1124 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1125 err = -EFAULT;
1126 break;
1127
1128 case SIOCADDTUNNEL:
1129 case SIOCCHGTUNNEL:
1130 err = -EPERM;
af31f412 1131 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
c12b395a 1132 goto done;
1133
1134 err = -EFAULT;
1135 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1136 goto done;
1137
1138 err = -EINVAL;
1139 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1140 goto done;
1141
1142 if (!(p.i_flags&GRE_KEY))
1143 p.i_key = 0;
1144 if (!(p.o_flags&GRE_KEY))
1145 p.o_key = 0;
1146
1147 ip6gre_tnl_parm_from_user(&p1, &p);
1148 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1149
1150 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1151 if (t != NULL) {
1152 if (t->dev != dev) {
1153 err = -EEXIST;
1154 break;
1155 }
1156 } else {
1157 t = netdev_priv(dev);
1158
1159 ip6gre_tunnel_unlink(ign, t);
1160 synchronize_net();
1161 ip6gre_tnl_change(t, &p1, 1);
1162 ip6gre_tunnel_link(ign, t);
1163 netdev_state_change(dev);
1164 }
1165 }
1166
1167 if (t) {
1168 err = 0;
1169
1170 ip6gre_tnl_parm_to_user(&p, &t->parms);
1171 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1172 err = -EFAULT;
1173 } else
1174 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1175 break;
1176
1177 case SIOCDELTUNNEL:
1178 err = -EPERM;
af31f412 1179 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
c12b395a 1180 goto done;
1181
1182 if (dev == ign->fb_tunnel_dev) {
1183 err = -EFAULT;
1184 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1185 goto done;
1186 err = -ENOENT;
1187 ip6gre_tnl_parm_from_user(&p1, &p);
1188 t = ip6gre_tunnel_locate(net, &p1, 0);
1189 if (t == NULL)
1190 goto done;
1191 err = -EPERM;
1192 if (t == netdev_priv(ign->fb_tunnel_dev))
1193 goto done;
1194 dev = t->dev;
1195 }
1196 unregister_netdevice(dev);
1197 err = 0;
1198 break;
1199
1200 default:
1201 err = -EINVAL;
1202 }
1203
1204done:
1205 return err;
1206}
1207
1208static int ip6gre_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1209{
1210 struct ip6_tnl *tunnel = netdev_priv(dev);
1211 if (new_mtu < 68 ||
1212 new_mtu > 0xFFF8 - dev->hard_header_len - tunnel->hlen)
1213 return -EINVAL;
1214 dev->mtu = new_mtu;
1215 return 0;
1216}
1217
1218static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1219 unsigned short type,
1220 const void *daddr, const void *saddr, unsigned int len)
1221{
1222 struct ip6_tnl *t = netdev_priv(dev);
1223 struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen);
1224 __be16 *p = (__be16 *)(ipv6h+1);
1225
3e4e4c1f 1226 ip6_flow_hdr(ipv6h, 0, t->fl.u.ip6.flowlabel);
c12b395a 1227 ipv6h->hop_limit = t->parms.hop_limit;
1228 ipv6h->nexthdr = NEXTHDR_GRE;
1229 ipv6h->saddr = t->parms.laddr;
1230 ipv6h->daddr = t->parms.raddr;
1231
1232 p[0] = t->parms.o_flags;
1233 p[1] = htons(type);
1234
1235 /*
1236 * Set the source hardware address.
1237 */
1238
1239 if (saddr)
1240 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1241 if (daddr)
1242 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1243 if (!ipv6_addr_any(&ipv6h->daddr))
1244 return t->hlen;
1245
1246 return -t->hlen;
1247}
1248
c12b395a 1249static const struct header_ops ip6gre_header_ops = {
1250 .create = ip6gre_header,
c12b395a 1251};
1252
1253static const struct net_device_ops ip6gre_netdev_ops = {
1254 .ndo_init = ip6gre_tunnel_init,
1255 .ndo_uninit = ip6gre_tunnel_uninit,
1256 .ndo_start_xmit = ip6gre_tunnel_xmit,
1257 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1258 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1259 .ndo_get_stats64 = ip6gre_get_stats64,
1260};
1261
1262static void ip6gre_dev_free(struct net_device *dev)
1263{
1264 free_percpu(dev->tstats);
1265 free_netdev(dev);
1266}
1267
1268static void ip6gre_tunnel_setup(struct net_device *dev)
1269{
1270 struct ip6_tnl *t;
1271
1272 dev->netdev_ops = &ip6gre_netdev_ops;
1273 dev->destructor = ip6gre_dev_free;
1274
1275 dev->type = ARPHRD_IP6GRE;
1276 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr) + 4;
1277 dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr) - 4;
1278 t = netdev_priv(dev);
1279 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1280 dev->mtu -= 8;
1281 dev->flags |= IFF_NOARP;
1282 dev->iflink = 0;
1283 dev->addr_len = sizeof(struct in6_addr);
1284 dev->features |= NETIF_F_NETNS_LOCAL;
1285 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1286}
1287
1288static int ip6gre_tunnel_init(struct net_device *dev)
1289{
1290 struct ip6_tnl *tunnel;
1291
1292 tunnel = netdev_priv(dev);
1293
1294 tunnel->dev = dev;
1295 strcpy(tunnel->parms.name, dev->name);
1296
1297 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1298 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1299
1300 if (ipv6_addr_any(&tunnel->parms.raddr))
1301 dev->header_ops = &ip6gre_header_ops;
1302
1303 dev->tstats = alloc_percpu(struct pcpu_tstats);
1304 if (!dev->tstats)
1305 return -ENOMEM;
1306
1307 return 0;
1308}
1309
1310static void ip6gre_fb_tunnel_init(struct net_device *dev)
1311{
1312 struct ip6_tnl *tunnel = netdev_priv(dev);
1313
1314 tunnel->dev = dev;
1315 strcpy(tunnel->parms.name, dev->name);
1316
1317 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1318
1319 dev_hold(dev);
1320}
1321
1322
1323static struct inet6_protocol ip6gre_protocol __read_mostly = {
1324 .handler = ip6gre_rcv,
1325 .err_handler = ip6gre_err,
1326 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1327};
1328
1329static void ip6gre_destroy_tunnels(struct ip6gre_net *ign,
1330 struct list_head *head)
1331{
1332 int prio;
1333
1334 for (prio = 0; prio < 4; prio++) {
1335 int h;
1336 for (h = 0; h < HASH_SIZE; h++) {
1337 struct ip6_tnl *t;
1338
1339 t = rtnl_dereference(ign->tunnels[prio][h]);
1340
1341 while (t != NULL) {
1342 unregister_netdevice_queue(t->dev, head);
1343 t = rtnl_dereference(t->next);
1344 }
1345 }
1346 }
1347}
1348
1349static int __net_init ip6gre_init_net(struct net *net)
1350{
1351 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1352 int err;
1353
1354 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1355 ip6gre_tunnel_setup);
1356 if (!ign->fb_tunnel_dev) {
1357 err = -ENOMEM;
1358 goto err_alloc_dev;
1359 }
1360 dev_net_set(ign->fb_tunnel_dev, net);
1361
1362 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1363 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1364
1365 err = register_netdev(ign->fb_tunnel_dev);
1366 if (err)
1367 goto err_reg_dev;
1368
1369 rcu_assign_pointer(ign->tunnels_wc[0],
1370 netdev_priv(ign->fb_tunnel_dev));
1371 return 0;
1372
1373err_reg_dev:
1374 ip6gre_dev_free(ign->fb_tunnel_dev);
1375err_alloc_dev:
1376 return err;
1377}
1378
1379static void __net_exit ip6gre_exit_net(struct net *net)
1380{
1381 struct ip6gre_net *ign;
1382 LIST_HEAD(list);
1383
1384 ign = net_generic(net, ip6gre_net_id);
1385 rtnl_lock();
1386 ip6gre_destroy_tunnels(ign, &list);
1387 unregister_netdevice_many(&list);
1388 rtnl_unlock();
1389}
1390
1391static struct pernet_operations ip6gre_net_ops = {
1392 .init = ip6gre_init_net,
1393 .exit = ip6gre_exit_net,
1394 .id = &ip6gre_net_id,
1395 .size = sizeof(struct ip6gre_net),
1396};
1397
1398static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
1399{
1400 __be16 flags;
1401
1402 if (!data)
1403 return 0;
1404
1405 flags = 0;
1406 if (data[IFLA_GRE_IFLAGS])
1407 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1408 if (data[IFLA_GRE_OFLAGS])
1409 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1410 if (flags & (GRE_VERSION|GRE_ROUTING))
1411 return -EINVAL;
1412
1413 return 0;
1414}
1415
1416static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
1417{
1418 struct in6_addr daddr;
1419
1420 if (tb[IFLA_ADDRESS]) {
1421 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1422 return -EINVAL;
1423 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1424 return -EADDRNOTAVAIL;
1425 }
1426
1427 if (!data)
1428 goto out;
1429
1430 if (data[IFLA_GRE_REMOTE]) {
1431 nla_memcpy(&daddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1432 if (ipv6_addr_any(&daddr))
1433 return -EINVAL;
1434 }
1435
1436out:
1437 return ip6gre_tunnel_validate(tb, data);
1438}
1439
1440
1441static void ip6gre_netlink_parms(struct nlattr *data[],
1442 struct __ip6_tnl_parm *parms)
1443{
1444 memset(parms, 0, sizeof(*parms));
1445
1446 if (!data)
1447 return;
1448
1449 if (data[IFLA_GRE_LINK])
1450 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1451
1452 if (data[IFLA_GRE_IFLAGS])
1453 parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]);
1454
1455 if (data[IFLA_GRE_OFLAGS])
1456 parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]);
1457
1458 if (data[IFLA_GRE_IKEY])
1459 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1460
1461 if (data[IFLA_GRE_OKEY])
1462 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1463
1464 if (data[IFLA_GRE_LOCAL])
1465 nla_memcpy(&parms->laddr, data[IFLA_GRE_LOCAL], sizeof(struct in6_addr));
1466
1467 if (data[IFLA_GRE_REMOTE])
1468 nla_memcpy(&parms->raddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1469
1470 if (data[IFLA_GRE_TTL])
1471 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1472
1473 if (data[IFLA_GRE_ENCAP_LIMIT])
1474 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1475
1476 if (data[IFLA_GRE_FLOWINFO])
1477 parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]);
1478
1479 if (data[IFLA_GRE_FLAGS])
1480 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1481}
1482
1483static int ip6gre_tap_init(struct net_device *dev)
1484{
1485 struct ip6_tnl *tunnel;
1486
1487 tunnel = netdev_priv(dev);
1488
1489 tunnel->dev = dev;
1490 strcpy(tunnel->parms.name, dev->name);
1491
1492 ip6gre_tnl_link_config(tunnel, 1);
1493
1494 dev->tstats = alloc_percpu(struct pcpu_tstats);
1495 if (!dev->tstats)
1496 return -ENOMEM;
1497
1498 return 0;
1499}
1500
1501static const struct net_device_ops ip6gre_tap_netdev_ops = {
1502 .ndo_init = ip6gre_tap_init,
1503 .ndo_uninit = ip6gre_tunnel_uninit,
1504 .ndo_start_xmit = ip6gre_tunnel_xmit,
1505 .ndo_set_mac_address = eth_mac_addr,
1506 .ndo_validate_addr = eth_validate_addr,
1507 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1508 .ndo_get_stats64 = ip6gre_get_stats64,
1509};
1510
1511static void ip6gre_tap_setup(struct net_device *dev)
1512{
1513
1514 ether_setup(dev);
1515
1516 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1517 dev->destructor = ip6gre_dev_free;
1518
1519 dev->iflink = 0;
1520 dev->features |= NETIF_F_NETNS_LOCAL;
1521}
1522
1523static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1524 struct nlattr *tb[], struct nlattr *data[])
1525{
1526 struct ip6_tnl *nt;
1527 struct net *net = dev_net(dev);
1528 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1529 int err;
1530
1531 nt = netdev_priv(dev);
1532 ip6gre_netlink_parms(data, &nt->parms);
1533
1534 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1535 return -EEXIST;
1536
1537 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1538 eth_hw_addr_random(dev);
1539
1540 nt->dev = dev;
1541 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1542
1543 /* Can use a lockless transmit, unless we generate output sequences */
1544 if (!(nt->parms.o_flags & GRE_SEQ))
1545 dev->features |= NETIF_F_LLTX;
1546
1547 err = register_netdevice(dev);
1548 if (err)
1549 goto out;
1550
1551 dev_hold(dev);
1552 ip6gre_tunnel_link(ign, nt);
1553
1554out:
1555 return err;
1556}
1557
1558static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1559 struct nlattr *data[])
1560{
1561 struct ip6_tnl *t, *nt;
1562 struct net *net = dev_net(dev);
1563 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1564 struct __ip6_tnl_parm p;
1565
1566 if (dev == ign->fb_tunnel_dev)
1567 return -EINVAL;
1568
1569 nt = netdev_priv(dev);
1570 ip6gre_netlink_parms(data, &p);
1571
1572 t = ip6gre_tunnel_locate(net, &p, 0);
1573
1574 if (t) {
1575 if (t->dev != dev)
1576 return -EEXIST;
1577 } else {
1578 t = nt;
1579
1580 ip6gre_tunnel_unlink(ign, t);
1581 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1582 ip6gre_tunnel_link(ign, t);
1583 netdev_state_change(dev);
1584 }
1585
1586 return 0;
1587}
1588
1589static size_t ip6gre_get_size(const struct net_device *dev)
1590{
1591 return
1592 /* IFLA_GRE_LINK */
1593 nla_total_size(4) +
1594 /* IFLA_GRE_IFLAGS */
1595 nla_total_size(2) +
1596 /* IFLA_GRE_OFLAGS */
1597 nla_total_size(2) +
1598 /* IFLA_GRE_IKEY */
1599 nla_total_size(4) +
1600 /* IFLA_GRE_OKEY */
1601 nla_total_size(4) +
1602 /* IFLA_GRE_LOCAL */
a3754133 1603 nla_total_size(sizeof(struct in6_addr)) +
c12b395a 1604 /* IFLA_GRE_REMOTE */
a3754133 1605 nla_total_size(sizeof(struct in6_addr)) +
c12b395a 1606 /* IFLA_GRE_TTL */
1607 nla_total_size(1) +
1608 /* IFLA_GRE_TOS */
1609 nla_total_size(1) +
1610 /* IFLA_GRE_ENCAP_LIMIT */
1611 nla_total_size(1) +
1612 /* IFLA_GRE_FLOWINFO */
1613 nla_total_size(4) +
1614 /* IFLA_GRE_FLAGS */
1615 nla_total_size(4) +
1616 0;
1617}
1618
1619static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1620{
1621 struct ip6_tnl *t = netdev_priv(dev);
1622 struct __ip6_tnl_parm *p = &t->parms;
1623
1624 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1625 nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) ||
1626 nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) ||
1627 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1628 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
a3754133
ND		 1629 nla_put(skb, IFLA_GRE_LOCAL, sizeof(struct in6_addr), &p->laddr) ||
1630 nla_put(skb, IFLA_GRE_REMOTE, sizeof(struct in6_addr), &p->raddr) ||
c12b395a 1631 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1632 /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/
1633 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1634 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1635 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags))
1636 goto nla_put_failure;
1637 return 0;
1638
1639nla_put_failure:
1640 return -EMSGSIZE;
1641}
1642
1643static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1644 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1645 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1646 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1647 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1648 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1649 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1650 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1651 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1652 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1653 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1654 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1655};
1656
1657static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1658 .kind = "ip6gre",
1659 .maxtype = IFLA_GRE_MAX,
1660 .policy = ip6gre_policy,
1661 .priv_size = sizeof(struct ip6_tnl),
1662 .setup = ip6gre_tunnel_setup,
1663 .validate = ip6gre_tunnel_validate,
1664 .newlink = ip6gre_newlink,
1665 .changelink = ip6gre_changelink,
1666 .get_size = ip6gre_get_size,
1667 .fill_info = ip6gre_fill_info,
1668};
1669
1670static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1671 .kind = "ip6gretap",
1672 .maxtype = IFLA_GRE_MAX,
1673 .policy = ip6gre_policy,
1674 .priv_size = sizeof(struct ip6_tnl),
1675 .setup = ip6gre_tap_setup,
1676 .validate = ip6gre_tap_validate,
1677 .newlink = ip6gre_newlink,
1678 .changelink = ip6gre_changelink,
1679 .get_size = ip6gre_get_size,
1680 .fill_info = ip6gre_fill_info,
1681};
1682
1683/*
1684 * And now the modules code and kernel interface.
1685 */
1686
1687static int __init ip6gre_init(void)
1688{
1689 int err;
1690
1691 pr_info("GRE over IPv6 tunneling driver\n");
1692
1693 err = register_pernet_device(&ip6gre_net_ops);
1694 if (err < 0)
1695 return err;
1696
1697 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1698 if (err < 0) {
1699 pr_info("%s: can't add protocol\n", __func__);
1700 goto add_proto_failed;
1701 }
1702
1703 err = rtnl_link_register(&ip6gre_link_ops);
1704 if (err < 0)
1705 goto rtnl_link_failed;
1706
1707 err = rtnl_link_register(&ip6gre_tap_ops);
1708 if (err < 0)
1709 goto tap_ops_failed;
1710
1711out:
1712 return err;
1713
1714tap_ops_failed:
1715 rtnl_link_unregister(&ip6gre_link_ops);
1716rtnl_link_failed:
1717 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1718add_proto_failed:
1719 unregister_pernet_device(&ip6gre_net_ops);
1720 goto out;
1721}
1722
1723static void __exit ip6gre_fini(void)
1724{
1725 rtnl_link_unregister(&ip6gre_tap_ops);
1726 rtnl_link_unregister(&ip6gre_link_ops);
1727 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1728 unregister_pernet_device(&ip6gre_net_ops);
1729}
1730
1731module_init(ip6gre_init);
1732module_exit(ip6gre_fini);
1733MODULE_LICENSE("GPL");
1734MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1735MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1736MODULE_ALIAS_RTNL_LINK("ip6gre");
1737MODULE_ALIAS_NETDEV("ip6gre0");
Linux kernel - Deliverables
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