projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[linux-2.6-block.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>
c5441932 41#include <net/ip_tunnels.h>
c12b395a 42#include <net/icmp.h>
43#include <net/protocol.h>
44#include <net/addrconf.h>
45#include <net/arp.h>
46#include <net/checksum.h>
47#include <net/dsfield.h>
48#include <net/inet_ecn.h>
49#include <net/xfrm.h>
50#include <net/net_namespace.h>
51#include <net/netns/generic.h>
52#include <net/rtnetlink.h>
53
54#include <net/ipv6.h>
55#include <net/ip6_fib.h>
56#include <net/ip6_route.h>
57#include <net/ip6_tunnel.h>
58
59
eccc1bb8 60static bool log_ecn_error = true;
61module_param(log_ecn_error, bool, 0644);
62MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
63
c12b395a 64#define HASH_SIZE_SHIFT 5
65#define HASH_SIZE (1 << HASH_SIZE_SHIFT)
66
67static int ip6gre_net_id __read_mostly;
68struct ip6gre_net {
69 struct ip6_tnl __rcu *tunnels[4][HASH_SIZE];
70
71 struct net_device *fb_tunnel_dev;
72};
73
74static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
22f08069 75static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
c12b395a 76static int ip6gre_tunnel_init(struct net_device *dev);
77static void ip6gre_tunnel_setup(struct net_device *dev);
78static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
79static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
80
81/* Tunnel hash table */
82
83/*
84 4 hash tables:
85
86 3: (remote,local)
87 2: (remote,*)
88 1: (*,local)
89 0: (*,*)
90
91 We require exact key match i.e. if a key is present in packet
92 it will match only tunnel with the same key; if it is not present,
93 it will match only keyless tunnel.
94
95 All keysless packets, if not matched configured keyless tunnels
96 will match fallback tunnel.
97 */
98
99#define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(HASH_SIZE - 1))
100static u32 HASH_ADDR(const struct in6_addr *addr)
101{
102 u32 hash = ipv6_addr_hash(addr);
103
104 return hash_32(hash, HASH_SIZE_SHIFT);
105}
106
107#define tunnels_r_l tunnels[3]
108#define tunnels_r tunnels[2]
109#define tunnels_l tunnels[1]
110#define tunnels_wc tunnels[0]
c12b395a 111
c12b395a 112/* Given src, dst and key, find appropriate for input tunnel. */
113
114static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
115 const struct in6_addr *remote, const struct in6_addr *local,
116 __be32 key, __be16 gre_proto)
117{
118 struct net *net = dev_net(dev);
119 int link = dev->ifindex;
120 unsigned int h0 = HASH_ADDR(remote);
121 unsigned int h1 = HASH_KEY(key);
122 struct ip6_tnl *t, *cand = NULL;
123 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
124 int dev_type = (gre_proto == htons(ETH_P_TEB)) ?
125 ARPHRD_ETHER : ARPHRD_IP6GRE;
126 int score, cand_score = 4;
127
e086cadc 128 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
c12b395a 129 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
130 !ipv6_addr_equal(remote, &t->parms.raddr) ||
131 key != t->parms.i_key ||
132 !(t->dev->flags & IFF_UP))
133 continue;
134
135 if (t->dev->type != ARPHRD_IP6GRE &&
136 t->dev->type != dev_type)
137 continue;
138
139 score = 0;
140 if (t->parms.link != link)
141 score |= 1;
142 if (t->dev->type != dev_type)
143 score |= 2;
144 if (score == 0)
145 return t;
146
147 if (score < cand_score) {
148 cand = t;
149 cand_score = score;
150 }
151 }
152
e086cadc 153 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
c12b395a 154 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
155 key != t->parms.i_key ||
156 !(t->dev->flags & IFF_UP))
157 continue;
158
159 if (t->dev->type != ARPHRD_IP6GRE &&
160 t->dev->type != dev_type)
161 continue;
162
163 score = 0;
164 if (t->parms.link != link)
165 score |= 1;
166 if (t->dev->type != dev_type)
167 score |= 2;
168 if (score == 0)
169 return t;
170
171 if (score < cand_score) {
172 cand = t;
173 cand_score = score;
174 }
175 }
176
e086cadc 177 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
c12b395a 178 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
179 (!ipv6_addr_equal(local, &t->parms.raddr) ||
180 !ipv6_addr_is_multicast(local))) ||
181 key != t->parms.i_key ||
182 !(t->dev->flags & IFF_UP))
183 continue;
184
185 if (t->dev->type != ARPHRD_IP6GRE &&
186 t->dev->type != dev_type)
187 continue;
188
189 score = 0;
190 if (t->parms.link != link)
191 score |= 1;
192 if (t->dev->type != dev_type)
193 score |= 2;
194 if (score == 0)
195 return t;
196
197 if (score < cand_score) {
198 cand = t;
199 cand_score = score;
200 }
201 }
202
e086cadc 203 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
c12b395a 204 if (t->parms.i_key != key ||
205 !(t->dev->flags & IFF_UP))
206 continue;
207
208 if (t->dev->type != ARPHRD_IP6GRE &&
209 t->dev->type != dev_type)
210 continue;
211
212 score = 0;
213 if (t->parms.link != link)
214 score |= 1;
215 if (t->dev->type != dev_type)
216 score |= 2;
217 if (score == 0)
218 return t;
219
220 if (score < cand_score) {
221 cand = t;
222 cand_score = score;
223 }
224 }
225
53b24b8f 226 if (cand)
c12b395a 227 return cand;
228
229 dev = ign->fb_tunnel_dev;
230 if (dev->flags & IFF_UP)
231 return netdev_priv(dev);
232
233 return NULL;
234}
235
236static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
237 const struct __ip6_tnl_parm *p)
238{
239 const struct in6_addr *remote = &p->raddr;
240 const struct in6_addr *local = &p->laddr;
241 unsigned int h = HASH_KEY(p->i_key);
242 int prio = 0;
243
244 if (!ipv6_addr_any(local))
245 prio |= 1;
246 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
247 prio |= 2;
248 h ^= HASH_ADDR(remote);
249 }
250
251 return &ign->tunnels[prio][h];
252}
253
254static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
255 const struct ip6_tnl *t)
256{
257 return __ip6gre_bucket(ign, &t->parms);
258}
259
260static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
261{
262 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
263
264 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
265 rcu_assign_pointer(*tp, t);
266}
267
268static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
269{
270 struct ip6_tnl __rcu **tp;
271 struct ip6_tnl *iter;
272
273 for (tp = ip6gre_bucket(ign, t);
274 (iter = rtnl_dereference(*tp)) != NULL;
275 tp = &iter->next) {
276 if (t == iter) {
277 rcu_assign_pointer(*tp, t->next);
278 break;
279 }
280 }
281}
282
283static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
284 const struct __ip6_tnl_parm *parms,
285 int type)
286{
287 const struct in6_addr *remote = &parms->raddr;
288 const struct in6_addr *local = &parms->laddr;
289 __be32 key = parms->i_key;
290 int link = parms->link;
291 struct ip6_tnl *t;
292 struct ip6_tnl __rcu **tp;
293 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
294
295 for (tp = __ip6gre_bucket(ign, parms);
296 (t = rtnl_dereference(*tp)) != NULL;
297 tp = &t->next)
298 if (ipv6_addr_equal(local, &t->parms.laddr) &&
299 ipv6_addr_equal(remote, &t->parms.raddr) &&
300 key == t->parms.i_key &&
301 link == t->parms.link &&
302 type == t->dev->type)
303 break;
304
305 return t;
306}
307
308static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
309 const struct __ip6_tnl_parm *parms, int create)
310{
311 struct ip6_tnl *t, *nt;
312 struct net_device *dev;
313 char name[IFNAMSIZ];
314 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
315
316 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
cd0a0bd9
SK		 317 if (t && create)
318 return NULL;
c12b395a 319 if (t || !create)
320 return t;
321
322 if (parms->name[0])
323 strlcpy(name, parms->name, IFNAMSIZ);
324 else
325 strcpy(name, "ip6gre%d");
326
c835a677
TG		 327 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
328 ip6gre_tunnel_setup);
c12b395a 329 if (!dev)
330 return NULL;
331
332 dev_net_set(dev, net);
333
334 nt = netdev_priv(dev);
335 nt->parms = *parms;
336 dev->rtnl_link_ops = &ip6gre_link_ops;
337
338 nt->dev = dev;
0bd87628 339 nt->net = dev_net(dev);
c12b395a 340 ip6gre_tnl_link_config(nt, 1);
341
342 if (register_netdevice(dev) < 0)
343 goto failed_free;
344
345 /* Can use a lockless transmit, unless we generate output sequences */
346 if (!(nt->parms.o_flags & GRE_SEQ))
347 dev->features |= NETIF_F_LLTX;
348
349 dev_hold(dev);
350 ip6gre_tunnel_link(ign, nt);
351 return nt;
352
353failed_free:
354 free_netdev(dev);
355 return NULL;
356}
357
358static void ip6gre_tunnel_uninit(struct net_device *dev)
359{
22f08069
ND		 360 struct ip6_tnl *t = netdev_priv(dev);
361 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
c12b395a 362
22f08069 363 ip6gre_tunnel_unlink(ign, t);
d4257295 364 ip6_tnl_dst_reset(t);
c12b395a 365 dev_put(dev);
366}
367
368
369static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
370 u8 type, u8 code, int offset, __be32 info)
371{
372 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
b87fb39e
ED		 373 __be16 *p = (__be16 *)(skb->data + offset);
374 int grehlen = offset + 4;
c12b395a 375 struct ip6_tnl *t;
376 __be16 flags;
377
378 flags = p[0];
379 if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) {
380 if (flags&(GRE_VERSION|GRE_ROUTING))
381 return;
382 if (flags&GRE_KEY) {
383 grehlen += 4;
384 if (flags&GRE_CSUM)
385 grehlen += 4;
386 }
387 }
388
389 /* If only 8 bytes returned, keyed message will be dropped here */
b87fb39e 390 if (!pskb_may_pull(skb, grehlen))
c12b395a 391 return;
b87fb39e
ED		 392 ipv6h = (const struct ipv6hdr *)skb->data;
393 p = (__be16 *)(skb->data + offset);
c12b395a 394
c12b395a 395 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
396 flags & GRE_KEY ?
397 *(((__be32 *)p) + (grehlen / 4) - 1) : 0,
398 p[1]);
63159f29 399 if (!t)
0c5794a6 400 return;
c12b395a 401
402 switch (type) {
403 __u32 teli;
404 struct ipv6_tlv_tnl_enc_lim *tel;
405 __u32 mtu;
406 case ICMPV6_DEST_UNREACH:
407 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
408 t->parms.name);
409 break;
410 case ICMPV6_TIME_EXCEED:
411 if (code == ICMPV6_EXC_HOPLIMIT) {
412 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
413 t->parms.name);
414 }
415 break;
416 case ICMPV6_PARAMPROB:
417 teli = 0;
418 if (code == ICMPV6_HDR_FIELD)
419 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
420
d1e158e2 421 if (teli && teli == be32_to_cpu(info) - 2) {
c12b395a 422 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
423 if (tel->encap_limit == 0) {
424 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
425 t->parms.name);
426 }
427 } else {
428 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
429 t->parms.name);
430 }
431 break;
432 case ICMPV6_PKT_TOOBIG:
d1e158e2 433 mtu = be32_to_cpu(info) - offset;
c12b395a 434 if (mtu < IPV6_MIN_MTU)
435 mtu = IPV6_MIN_MTU;
436 t->dev->mtu = mtu;
437 break;
438 }
439
440 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
441 t->err_count++;
442 else
443 t->err_count = 1;
444 t->err_time = jiffies;
c12b395a 445}
446
c12b395a 447static int ip6gre_rcv(struct sk_buff *skb)
448{
449 const struct ipv6hdr *ipv6h;
450 u8 *h;
451 __be16 flags;
452 __sum16 csum = 0;
453 __be32 key = 0;
454 u32 seqno = 0;
455 struct ip6_tnl *tunnel;
456 int offset = 4;
457 __be16 gre_proto;
eccc1bb8 458 int err;
c12b395a 459
460 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
0c5794a6 461 goto drop;
c12b395a 462
463 ipv6h = ipv6_hdr(skb);
464 h = skb->data;
465 flags = *(__be16 *)h;
466
467 if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) {
468 /* - Version must be 0.
469 - We do not support routing headers.
470 */
471 if (flags&(GRE_VERSION|GRE_ROUTING))
0c5794a6 472 goto drop;
c12b395a 473
474 if (flags&GRE_CSUM) {
81249bea 475 csum = skb_checksum_simple_validate(skb);
c12b395a 476 offset += 4;
477 }
478 if (flags&GRE_KEY) {
479 key = *(__be32 *)(h + offset);
480 offset += 4;
481 }
482 if (flags&GRE_SEQ) {
483 seqno = ntohl(*(__be32 *)(h + offset));
484 offset += 4;
485 }
486 }
487
488 gre_proto = *(__be16 *)(h + 2);
489
c12b395a 490 tunnel = ip6gre_tunnel_lookup(skb->dev,
491 &ipv6h->saddr, &ipv6h->daddr, key,
492 gre_proto);
493 if (tunnel) {
8f84985f 494 struct pcpu_sw_netstats *tstats;
c12b395a 495
496 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
497 goto drop;
498
499 if (!ip6_tnl_rcv_ctl(tunnel, &ipv6h->daddr, &ipv6h->saddr)) {
500 tunnel->dev->stats.rx_dropped++;
501 goto drop;
502 }
503
c12b395a 504 skb->protocol = gre_proto;
505 /* WCCP version 1 and 2 protocol decoding.
be6572fd 506 * - Change protocol to IPv6
c12b395a 507 * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
508 */
509 if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) {
be6572fd 510 skb->protocol = htons(ETH_P_IPV6);
c12b395a 511 if ((*(h + offset) & 0xF0) != 0x40)
512 offset += 4;
513 }
514
515 skb->mac_header = skb->network_header;
516 __pskb_pull(skb, offset);
517 skb_postpull_rcsum(skb, skb_transport_header(skb), offset);
c12b395a 518
519 if (((flags&GRE_CSUM) && csum) ||
520 (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) {
521 tunnel->dev->stats.rx_crc_errors++;
522 tunnel->dev->stats.rx_errors++;
523 goto drop;
524 }
525 if (tunnel->parms.i_flags&GRE_SEQ) {
526 if (!(flags&GRE_SEQ) ||
527 (tunnel->i_seqno &&
528 (s32)(seqno - tunnel->i_seqno) < 0)) {
529 tunnel->dev->stats.rx_fifo_errors++;
530 tunnel->dev->stats.rx_errors++;
531 goto drop;
532 }
533 tunnel->i_seqno = seqno + 1;
534 }
535
536 /* Warning: All skb pointers will be invalidated! */
537 if (tunnel->dev->type == ARPHRD_ETHER) {
538 if (!pskb_may_pull(skb, ETH_HLEN)) {
539 tunnel->dev->stats.rx_length_errors++;
540 tunnel->dev->stats.rx_errors++;
541 goto drop;
542 }
543
544 ipv6h = ipv6_hdr(skb);
545 skb->protocol = eth_type_trans(skb, tunnel->dev);
546 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
547 }
548
ea23192e 549 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
eccc1bb8 550
551 skb_reset_network_header(skb);
552
553 err = IP6_ECN_decapsulate(ipv6h, skb);
554 if (unlikely(err)) {
555 if (log_ecn_error)
556 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
557 &ipv6h->saddr,
558 ipv6_get_dsfield(ipv6h));
559 if (err > 1) {
560 ++tunnel->dev->stats.rx_frame_errors;
561 ++tunnel->dev->stats.rx_errors;
562 goto drop;
563 }
564 }
565
c12b395a 566 tstats = this_cpu_ptr(tunnel->dev->tstats);
567 u64_stats_update_begin(&tstats->syncp);
568 tstats->rx_packets++;
569 tstats->rx_bytes += skb->len;
570 u64_stats_update_end(&tstats->syncp);
571
c12b395a 572 netif_rx(skb);
573
c12b395a 574 return 0;
575 }
576 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
577
578drop:
c12b395a 579 kfree_skb(skb);
580 return 0;
581}
582
583struct ipv6_tel_txoption {
584 struct ipv6_txoptions ops;
585 __u8 dst_opt[8];
586};
587
588static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
589{
590 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
591
592 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
593 opt->dst_opt[3] = 1;
594 opt->dst_opt[4] = encap_limit;
595 opt->dst_opt[5] = IPV6_TLV_PADN;
596 opt->dst_opt[6] = 1;
597
598 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
599 opt->ops.opt_nflen = 8;
600}
601
602static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
603 struct net_device *dev,
604 __u8 dsfield,
605 struct flowi6 *fl6,
606 int encap_limit,
607 __u32 *pmtu)
608{
c12b395a 609 struct ip6_tnl *tunnel = netdev_priv(dev);
22f08069 610 struct net *net = tunnel->net;
c12b395a 611 struct net_device *tdev; /* Device to other host */
612 struct ipv6hdr *ipv6h; /* Our new IP header */
3da812d8 613 unsigned int max_headroom = 0; /* The extra header space needed */
c12b395a 614 int gre_hlen;
615 struct ipv6_tel_txoption opt;
616 int mtu;
617 struct dst_entry *dst = NULL, *ndst = NULL;
618 struct net_device_stats *stats = &tunnel->dev->stats;
619 int err = -1;
620 u8 proto;
c12b395a 621 struct sk_buff *new_skb;
54bc9bac 622 __be16 protocol;
c12b395a 623
624 if (dev->type == ARPHRD_ETHER)
625 IPCB(skb)->flags = 0;
626
627 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) {
628 gre_hlen = 0;
629 ipv6h = (struct ipv6hdr *)skb->data;
630 fl6->daddr = ipv6h->daddr;
631 } else {
632 gre_hlen = tunnel->hlen;
633 fl6->daddr = tunnel->parms.raddr;
634 }
635
636 if (!fl6->flowi6_mark)
637 dst = ip6_tnl_dst_check(tunnel);
638
639 if (!dst) {
640 ndst = ip6_route_output(net, NULL, fl6);
641
642 if (ndst->error)
643 goto tx_err_link_failure;
644 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
645 if (IS_ERR(ndst)) {
646 err = PTR_ERR(ndst);
647 ndst = NULL;
648 goto tx_err_link_failure;
649 }
650 dst = ndst;
651 }
652
653 tdev = dst->dev;
654
655 if (tdev == dev) {
656 stats->collisions++;
657 net_warn_ratelimited("%s: Local routing loop detected!\n",
658 tunnel->parms.name);
659 goto tx_err_dst_release;
660 }
661
662 mtu = dst_mtu(dst) - sizeof(*ipv6h);
663 if (encap_limit >= 0) {
664 max_headroom += 8;
665 mtu -= 8;
666 }
667 if (mtu < IPV6_MIN_MTU)
668 mtu = IPV6_MIN_MTU;
669 if (skb_dst(skb))
670 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
671 if (skb->len > mtu) {
672 *pmtu = mtu;
673 err = -EMSGSIZE;
674 goto tx_err_dst_release;
675 }
676
677 if (tunnel->err_count > 0) {
678 if (time_before(jiffies,
679 tunnel->err_time + IP6TUNNEL_ERR_TIMEO)) {
680 tunnel->err_count--;
681
682 dst_link_failure(skb);
683 } else
684 tunnel->err_count = 0;
685 }
686
963a88b3
ND		 687 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
688
3da812d8 689 max_headroom += LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len;
c12b395a 690
691 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
692 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
693 new_skb = skb_realloc_headroom(skb, max_headroom);
694 if (max_headroom > dev->needed_headroom)
695 dev->needed_headroom = max_headroom;
696 if (!new_skb)
697 goto tx_err_dst_release;
698
699 if (skb->sk)
700 skb_set_owner_w(new_skb, skb->sk);
701 consume_skb(skb);
702 skb = new_skb;
703 }
704
c12b395a 705 if (fl6->flowi6_mark) {
706 skb_dst_set(skb, dst);
707 ndst = NULL;
708 } else {
709 skb_dst_set_noref(skb, dst);
710 }
711
c12b395a 712 proto = NEXTHDR_GRE;
713 if (encap_limit >= 0) {
714 init_tel_txopt(&opt, encap_limit);
715 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
716 }
717
3d483058
HFS		 718 if (likely(!skb->encapsulation)) {
719 skb_reset_inner_headers(skb);
720 skb->encapsulation = 1;
721 }
722
c12b395a 723 skb_push(skb, gre_hlen);
724 skb_reset_network_header(skb);
ae782bb1 725 skb_set_transport_header(skb, sizeof(*ipv6h));
c12b395a 726
727 /*
728 * Push down and install the IP header.
729 */
730 ipv6h = ipv6_hdr(skb);
cb1ce2ef 731 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield),
42240901 732 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6));
c12b395a 733 ipv6h->hop_limit = tunnel->parms.hop_limit;
734 ipv6h->nexthdr = proto;
735 ipv6h->saddr = fl6->saddr;
736 ipv6h->daddr = fl6->daddr;
737
738 ((__be16 *)(ipv6h + 1))[0] = tunnel->parms.o_flags;
54bc9bac
TH		 739 protocol = (dev->type == ARPHRD_ETHER) ?
740 htons(ETH_P_TEB) : skb->protocol;
741 ((__be16 *)(ipv6h + 1))[1] = protocol;
c12b395a 742
743 if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) {
744 __be32 *ptr = (__be32 *)(((u8 *)ipv6h) + tunnel->hlen - 4);
745
746 if (tunnel->parms.o_flags&GRE_SEQ) {
747 ++tunnel->o_seqno;
748 *ptr = htonl(tunnel->o_seqno);
749 ptr--;
750 }
751 if (tunnel->parms.o_flags&GRE_KEY) {
752 *ptr = tunnel->parms.o_key;
753 ptr--;
754 }
755 if (tunnel->parms.o_flags&GRE_CSUM) {
756 *ptr = 0;
757 *(__sum16 *)ptr = ip_compute_csum((void *)(ipv6h+1),
758 skb->len - sizeof(struct ipv6hdr));
759 }
760 }
761
54bc9bac
TH		 762 skb_set_inner_protocol(skb, protocol);
763
79b16aad 764 ip6tunnel_xmit(NULL, skb, dev);
c12b395a 765 if (ndst)
766 ip6_tnl_dst_store(tunnel, ndst);
c12b395a 767 return 0;
768tx_err_link_failure:
769 stats->tx_carrier_errors++;
770 dst_link_failure(skb);
771tx_err_dst_release:
772 dst_release(ndst);
773 return err;
774}
775
776static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
777{
778 struct ip6_tnl *t = netdev_priv(dev);
779 const struct iphdr *iph = ip_hdr(skb);
780 int encap_limit = -1;
781 struct flowi6 fl6;
782 __u8 dsfield;
783 __u32 mtu;
784 int err;
785
786 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
787 encap_limit = t->parms.encap_limit;
788
789 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
3be07244 790 fl6.flowi6_proto = IPPROTO_GRE;
c12b395a 791
792 dsfield = ipv4_get_dsfield(iph);
793
794 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
795 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
796 & IPV6_TCLASS_MASK;
797 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
798 fl6.flowi6_mark = skb->mark;
799
800 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
801 if (err != 0) {
802 /* XXX: send ICMP error even if DF is not set. */
803 if (err == -EMSGSIZE)
804 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
805 htonl(mtu));
806 return -1;
807 }
808
809 return 0;
810}
811
812static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
813{
814 struct ip6_tnl *t = netdev_priv(dev);
815 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
816 int encap_limit = -1;
817 __u16 offset;
818 struct flowi6 fl6;
819 __u8 dsfield;
820 __u32 mtu;
821 int err;
822
823 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
824 return -1;
825
826 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
827 if (offset > 0) {
828 struct ipv6_tlv_tnl_enc_lim *tel;
829 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
830 if (tel->encap_limit == 0) {
831 icmpv6_send(skb, ICMPV6_PARAMPROB,
832 ICMPV6_HDR_FIELD, offset + 2);
833 return -1;
834 }
835 encap_limit = tel->encap_limit - 1;
836 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
837 encap_limit = t->parms.encap_limit;
838
839 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
3be07244 840 fl6.flowi6_proto = IPPROTO_GRE;
c12b395a 841
842 dsfield = ipv6_get_dsfield(ipv6h);
843 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
844 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
845 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
3308de2b 846 fl6.flowlabel |= ip6_flowlabel(ipv6h);
c12b395a 847 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
848 fl6.flowi6_mark = skb->mark;
849
850 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
851 if (err != 0) {
852 if (err == -EMSGSIZE)
853 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
854 return -1;
855 }
856
857 return 0;
858}
859
860/**
861 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
862 * @t: the outgoing tunnel device
863 * @hdr: IPv6 header from the incoming packet
864 *
865 * Description:
866 * Avoid trivial tunneling loop by checking that tunnel exit-point
867 * doesn't match source of incoming packet.
868 *
869 * Return:
870 * 1 if conflict,
871 * 0 else
872 **/
873
874static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
875 const struct ipv6hdr *hdr)
876{
877 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
878}
879
880static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
881{
882 struct ip6_tnl *t = netdev_priv(dev);
883 int encap_limit = -1;
884 struct flowi6 fl6;
885 __u32 mtu;
886 int err;
887
888 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
889 encap_limit = t->parms.encap_limit;
890
891 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
892 fl6.flowi6_proto = skb->protocol;
893
894 err = ip6gre_xmit2(skb, dev, 0, &fl6, encap_limit, &mtu);
895
896 return err;
897}
898
899static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
900 struct net_device *dev)
901{
902 struct ip6_tnl *t = netdev_priv(dev);
903 struct net_device_stats *stats = &t->dev->stats;
904 int ret;
905
d5005140 906 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
41ab3e31 907 goto tx_err;
c12b395a 908
909 switch (skb->protocol) {
910 case htons(ETH_P_IP):
911 ret = ip6gre_xmit_ipv4(skb, dev);
912 break;
913 case htons(ETH_P_IPV6):
914 ret = ip6gre_xmit_ipv6(skb, dev);
915 break;
916 default:
917 ret = ip6gre_xmit_other(skb, dev);
918 break;
919 }
920
921 if (ret < 0)
922 goto tx_err;
923
924 return NETDEV_TX_OK;
925
926tx_err:
927 stats->tx_errors++;
928 stats->tx_dropped++;
929 kfree_skb(skb);
930 return NETDEV_TX_OK;
931}
932
933static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
934{
935 struct net_device *dev = t->dev;
936 struct __ip6_tnl_parm *p = &t->parms;
937 struct flowi6 *fl6 = &t->fl.u.ip6;
938 int addend = sizeof(struct ipv6hdr) + 4;
939
940 if (dev->type != ARPHRD_ETHER) {
941 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
942 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
943 }
944
945 /* Set up flowi template */
946 fl6->saddr = p->laddr;
947 fl6->daddr = p->raddr;
948 fl6->flowi6_oif = p->link;
949 fl6->flowlabel = 0;
950
951 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
952 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
953 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
954 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
955
956 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
957 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
958
959 if (p->flags&IP6_TNL_F_CAP_XMIT &&
960 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
961 dev->flags |= IFF_POINTOPOINT;
962 else
963 dev->flags &= ~IFF_POINTOPOINT;
964
c12b395a 965 /* Precalculate GRE options length */
966 if (t->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) {
967 if (t->parms.o_flags&GRE_CSUM)
968 addend += 4;
969 if (t->parms.o_flags&GRE_KEY)
970 addend += 4;
971 if (t->parms.o_flags&GRE_SEQ)
972 addend += 4;
973 }
bf581759 974 t->hlen = addend;
c12b395a 975
976 if (p->flags & IP6_TNL_F_CAP_XMIT) {
977 int strict = (ipv6_addr_type(&p->raddr) &
978 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
979
22f08069 980 struct rt6_info *rt = rt6_lookup(t->net,
c12b395a 981 &p->raddr, &p->laddr,
982 p->link, strict);
983
63159f29 984 if (!rt)
c12b395a 985 return;
986
987 if (rt->dst.dev) {
988 dev->hard_header_len = rt->dst.dev->hard_header_len + addend;
989
990 if (set_mtu) {
991 dev->mtu = rt->dst.dev->mtu - addend;
992 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
993 dev->mtu -= 8;
994
995 if (dev->mtu < IPV6_MIN_MTU)
996 dev->mtu = IPV6_MIN_MTU;
997 }
998 }
94e187c0 999 ip6_rt_put(rt);
c12b395a 1000 }
c12b395a 1001}
1002
1003static int ip6gre_tnl_change(struct ip6_tnl *t,
1004 const struct __ip6_tnl_parm *p, int set_mtu)
1005{
1006 t->parms.laddr = p->laddr;
1007 t->parms.raddr = p->raddr;
1008 t->parms.flags = p->flags;
1009 t->parms.hop_limit = p->hop_limit;
1010 t->parms.encap_limit = p->encap_limit;
1011 t->parms.flowinfo = p->flowinfo;
1012 t->parms.link = p->link;
1013 t->parms.proto = p->proto;
1014 t->parms.i_key = p->i_key;
1015 t->parms.o_key = p->o_key;
1016 t->parms.i_flags = p->i_flags;
1017 t->parms.o_flags = p->o_flags;
1018 ip6_tnl_dst_reset(t);
1019 ip6gre_tnl_link_config(t, set_mtu);
1020 return 0;
1021}
1022
1023static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1024 const struct ip6_tnl_parm2 *u)
1025{
1026 p->laddr = u->laddr;
1027 p->raddr = u->raddr;
1028 p->flags = u->flags;
1029 p->hop_limit = u->hop_limit;
1030 p->encap_limit = u->encap_limit;
1031 p->flowinfo = u->flowinfo;
1032 p->link = u->link;
1033 p->i_key = u->i_key;
1034 p->o_key = u->o_key;
1035 p->i_flags = u->i_flags;
1036 p->o_flags = u->o_flags;
1037 memcpy(p->name, u->name, sizeof(u->name));
1038}
1039
1040static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1041 const struct __ip6_tnl_parm *p)
1042{
1043 u->proto = IPPROTO_GRE;
1044 u->laddr = p->laddr;
1045 u->raddr = p->raddr;
1046 u->flags = p->flags;
1047 u->hop_limit = p->hop_limit;
1048 u->encap_limit = p->encap_limit;
1049 u->flowinfo = p->flowinfo;
1050 u->link = p->link;
1051 u->i_key = p->i_key;
1052 u->o_key = p->o_key;
1053 u->i_flags = p->i_flags;
1054 u->o_flags = p->o_flags;
1055 memcpy(u->name, p->name, sizeof(u->name));
1056}
1057
1058static int ip6gre_tunnel_ioctl(struct net_device *dev,
1059 struct ifreq *ifr, int cmd)
1060{
1061 int err = 0;
1062 struct ip6_tnl_parm2 p;
1063 struct __ip6_tnl_parm p1;
22f08069
ND		 1064 struct ip6_tnl *t = netdev_priv(dev);
1065 struct net *net = t->net;
c12b395a 1066 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1067
1068 switch (cmd) {
1069 case SIOCGETTUNNEL:
c12b395a 1070 if (dev == ign->fb_tunnel_dev) {
1071 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1072 err = -EFAULT;
1073 break;
1074 }
1075 ip6gre_tnl_parm_from_user(&p1, &p);
1076 t = ip6gre_tunnel_locate(net, &p1, 0);
63159f29 1077 if (!t)
22f08069 1078 t = netdev_priv(dev);
c12b395a 1079 }
5dbd5068 1080 memset(&p, 0, sizeof(p));
c12b395a 1081 ip6gre_tnl_parm_to_user(&p, &t->parms);
1082 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1083 err = -EFAULT;
1084 break;
1085
1086 case SIOCADDTUNNEL:
1087 case SIOCCHGTUNNEL:
1088 err = -EPERM;
af31f412 1089 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
c12b395a 1090 goto done;
1091
1092 err = -EFAULT;
1093 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1094 goto done;
1095
1096 err = -EINVAL;
1097 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1098 goto done;
1099
1100 if (!(p.i_flags&GRE_KEY))
1101 p.i_key = 0;
1102 if (!(p.o_flags&GRE_KEY))
1103 p.o_key = 0;
1104
1105 ip6gre_tnl_parm_from_user(&p1, &p);
1106 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1107
1108 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
53b24b8f 1109 if (t) {
c12b395a 1110 if (t->dev != dev) {
1111 err = -EEXIST;
1112 break;
1113 }
1114 } else {
1115 t = netdev_priv(dev);
1116
1117 ip6gre_tunnel_unlink(ign, t);
1118 synchronize_net();
1119 ip6gre_tnl_change(t, &p1, 1);
1120 ip6gre_tunnel_link(ign, t);
1121 netdev_state_change(dev);
1122 }
1123 }
1124
1125 if (t) {
1126 err = 0;
1127
5dbd5068 1128 memset(&p, 0, sizeof(p));
c12b395a 1129 ip6gre_tnl_parm_to_user(&p, &t->parms);
1130 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1131 err = -EFAULT;
1132 } else
1133 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1134 break;
1135
1136 case SIOCDELTUNNEL:
1137 err = -EPERM;
af31f412 1138 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
c12b395a 1139 goto done;
1140
1141 if (dev == ign->fb_tunnel_dev) {
1142 err = -EFAULT;
1143 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1144 goto done;
1145 err = -ENOENT;
1146 ip6gre_tnl_parm_from_user(&p1, &p);
1147 t = ip6gre_tunnel_locate(net, &p1, 0);
63159f29 1148 if (!t)
c12b395a 1149 goto done;
1150 err = -EPERM;
1151 if (t == netdev_priv(ign->fb_tunnel_dev))
1152 goto done;
1153 dev = t->dev;
1154 }
1155 unregister_netdevice(dev);
1156 err = 0;
1157 break;
1158
1159 default:
1160 err = -EINVAL;
1161 }
1162
1163done:
1164 return err;
1165}
1166
1167static int ip6gre_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1168{
c12b395a 1169 if (new_mtu < 68 ||
0e719e3a 1170 new_mtu > 0xFFF8 - dev->hard_header_len)
c12b395a 1171 return -EINVAL;
1172 dev->mtu = new_mtu;
1173 return 0;
1174}
1175
1176static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1177 unsigned short type,
1178 const void *daddr, const void *saddr, unsigned int len)
1179{
1180 struct ip6_tnl *t = netdev_priv(dev);
1181 struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen);
1182 __be16 *p = (__be16 *)(ipv6h+1);
1183
cb1ce2ef
TH		 1184 ip6_flow_hdr(ipv6h, 0,
1185 ip6_make_flowlabel(dev_net(dev), skb,
42240901 1186 t->fl.u.ip6.flowlabel, true,
67800f9b 1187 &t->fl.u.ip6));
c12b395a 1188 ipv6h->hop_limit = t->parms.hop_limit;
1189 ipv6h->nexthdr = NEXTHDR_GRE;
1190 ipv6h->saddr = t->parms.laddr;
1191 ipv6h->daddr = t->parms.raddr;
1192
1193 p[0] = t->parms.o_flags;
1194 p[1] = htons(type);
1195
1196 /*
1197 * Set the source hardware address.
1198 */
1199
1200 if (saddr)
1201 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1202 if (daddr)
1203 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1204 if (!ipv6_addr_any(&ipv6h->daddr))
1205 return t->hlen;
1206
1207 return -t->hlen;
1208}
1209
c12b395a 1210static const struct header_ops ip6gre_header_ops = {
1211 .create = ip6gre_header,
c12b395a 1212};
1213
1214static const struct net_device_ops ip6gre_netdev_ops = {
1215 .ndo_init = ip6gre_tunnel_init,
1216 .ndo_uninit = ip6gre_tunnel_uninit,
1217 .ndo_start_xmit = ip6gre_tunnel_xmit,
1218 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1219 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
f61dd388 1220 .ndo_get_stats64 = ip_tunnel_get_stats64,
ecf2c06a 1221 .ndo_get_iflink = ip6_tnl_get_iflink,
c12b395a 1222};
1223
1224static void ip6gre_dev_free(struct net_device *dev)
1225{
1226 free_percpu(dev->tstats);
1227 free_netdev(dev);
1228}
1229
1230static void ip6gre_tunnel_setup(struct net_device *dev)
1231{
1232 struct ip6_tnl *t;
1233
1234 dev->netdev_ops = &ip6gre_netdev_ops;
1235 dev->destructor = ip6gre_dev_free;
1236
1237 dev->type = ARPHRD_IP6GRE;
1238 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr) + 4;
1239 dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr) - 4;
1240 t = netdev_priv(dev);
1241 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1242 dev->mtu -= 8;
1243 dev->flags |= IFF_NOARP;
c12b395a 1244 dev->addr_len = sizeof(struct in6_addr);
02875878 1245 netif_keep_dst(dev);
c12b395a 1246}
1247
1248static int ip6gre_tunnel_init(struct net_device *dev)
1249{
1250 struct ip6_tnl *tunnel;
1251
1252 tunnel = netdev_priv(dev);
1253
1254 tunnel->dev = dev;
0bd87628 1255 tunnel->net = dev_net(dev);
c12b395a 1256 strcpy(tunnel->parms.name, dev->name);
1257
1258 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1259 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1260
1261 if (ipv6_addr_any(&tunnel->parms.raddr))
1262 dev->header_ops = &ip6gre_header_ops;
1263
26349c71 1264 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
c12b395a 1265 if (!dev->tstats)
1266 return -ENOMEM;
1267
1268 return 0;
1269}
1270
1271static void ip6gre_fb_tunnel_init(struct net_device *dev)
1272{
1273 struct ip6_tnl *tunnel = netdev_priv(dev);
1274
1275 tunnel->dev = dev;
0bd87628 1276 tunnel->net = dev_net(dev);
c12b395a 1277 strcpy(tunnel->parms.name, dev->name);
1278
1279 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1280
1281 dev_hold(dev);
1282}
1283
1284
1285static struct inet6_protocol ip6gre_protocol __read_mostly = {
1286 .handler = ip6gre_rcv,
1287 .err_handler = ip6gre_err,
1288 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1289};
1290
22f08069 1291static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
c12b395a 1292{
22f08069
ND		 1293 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1294 struct net_device *dev, *aux;
c12b395a 1295 int prio;
1296
22f08069
ND		 1297 for_each_netdev_safe(net, dev, aux)
1298 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1299 dev->rtnl_link_ops == &ip6gre_tap_ops)
1300 unregister_netdevice_queue(dev, head);
1301
c12b395a 1302 for (prio = 0; prio < 4; prio++) {
1303 int h;
1304 for (h = 0; h < HASH_SIZE; h++) {
1305 struct ip6_tnl *t;
1306
1307 t = rtnl_dereference(ign->tunnels[prio][h]);
1308
53b24b8f 1309 while (t) {
22f08069
ND		 1310 /* If dev is in the same netns, it has already
1311 * been added to the list by the previous loop.
1312 */
1313 if (!net_eq(dev_net(t->dev), net))
1314 unregister_netdevice_queue(t->dev,
1315 head);
c12b395a 1316 t = rtnl_dereference(t->next);
1317 }
1318 }
1319 }
1320}
1321
1322static int __net_init ip6gre_init_net(struct net *net)
1323{
1324 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1325 int err;
1326
1327 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
c835a677
TG		 1328 NET_NAME_UNKNOWN,
1329 ip6gre_tunnel_setup);
c12b395a 1330 if (!ign->fb_tunnel_dev) {
1331 err = -ENOMEM;
1332 goto err_alloc_dev;
1333 }
1334 dev_net_set(ign->fb_tunnel_dev, net);
22f08069
ND		 1335 /* FB netdevice is special: we have one, and only one per netns.
1336 * Allowing to move it to another netns is clearly unsafe.
1337 */
1338 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1339
c12b395a 1340
1341 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1342 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1343
1344 err = register_netdev(ign->fb_tunnel_dev);
1345 if (err)
1346 goto err_reg_dev;
1347
1348 rcu_assign_pointer(ign->tunnels_wc[0],
1349 netdev_priv(ign->fb_tunnel_dev));
1350 return 0;
1351
1352err_reg_dev:
1353 ip6gre_dev_free(ign->fb_tunnel_dev);
1354err_alloc_dev:
1355 return err;
1356}
1357
1358static void __net_exit ip6gre_exit_net(struct net *net)
1359{
c12b395a 1360 LIST_HEAD(list);
1361
c12b395a 1362 rtnl_lock();
22f08069 1363 ip6gre_destroy_tunnels(net, &list);
c12b395a 1364 unregister_netdevice_many(&list);
1365 rtnl_unlock();
1366}
1367
1368static struct pernet_operations ip6gre_net_ops = {
1369 .init = ip6gre_init_net,
1370 .exit = ip6gre_exit_net,
1371 .id = &ip6gre_net_id,
1372 .size = sizeof(struct ip6gre_net),
1373};
1374
1375static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
1376{
1377 __be16 flags;
1378
1379 if (!data)
1380 return 0;
1381
1382 flags = 0;
1383 if (data[IFLA_GRE_IFLAGS])
1384 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1385 if (data[IFLA_GRE_OFLAGS])
1386 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1387 if (flags & (GRE_VERSION|GRE_ROUTING))
1388 return -EINVAL;
1389
1390 return 0;
1391}
1392
1393static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
1394{
1395 struct in6_addr daddr;
1396
1397 if (tb[IFLA_ADDRESS]) {
1398 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1399 return -EINVAL;
1400 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1401 return -EADDRNOTAVAIL;
1402 }
1403
1404 if (!data)
1405 goto out;
1406
1407 if (data[IFLA_GRE_REMOTE]) {
67b61f6c 1408 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
c12b395a 1409 if (ipv6_addr_any(&daddr))
1410 return -EINVAL;
1411 }
1412
1413out:
1414 return ip6gre_tunnel_validate(tb, data);
1415}
1416
1417
1418static void ip6gre_netlink_parms(struct nlattr *data[],
1419 struct __ip6_tnl_parm *parms)
1420{
1421 memset(parms, 0, sizeof(*parms));
1422
1423 if (!data)
1424 return;
1425
1426 if (data[IFLA_GRE_LINK])
1427 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1428
1429 if (data[IFLA_GRE_IFLAGS])
1430 parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]);
1431
1432 if (data[IFLA_GRE_OFLAGS])
1433 parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]);
1434
1435 if (data[IFLA_GRE_IKEY])
1436 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1437
1438 if (data[IFLA_GRE_OKEY])
1439 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1440
1441 if (data[IFLA_GRE_LOCAL])
67b61f6c 1442 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
c12b395a 1443
1444 if (data[IFLA_GRE_REMOTE])
67b61f6c 1445 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
c12b395a 1446
1447 if (data[IFLA_GRE_TTL])
1448 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1449
1450 if (data[IFLA_GRE_ENCAP_LIMIT])
1451 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1452
1453 if (data[IFLA_GRE_FLOWINFO])
1454 parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]);
1455
1456 if (data[IFLA_GRE_FLAGS])
1457 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1458}
1459
1460static int ip6gre_tap_init(struct net_device *dev)
1461{
1462 struct ip6_tnl *tunnel;
1463
1464 tunnel = netdev_priv(dev);
1465
1466 tunnel->dev = dev;
0bd87628 1467 tunnel->net = dev_net(dev);
c12b395a 1468 strcpy(tunnel->parms.name, dev->name);
1469
1470 ip6gre_tnl_link_config(tunnel, 1);
1471
1c213bd2 1472 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
c12b395a 1473 if (!dev->tstats)
1474 return -ENOMEM;
1475
1476 return 0;
1477}
1478
1479static const struct net_device_ops ip6gre_tap_netdev_ops = {
1480 .ndo_init = ip6gre_tap_init,
1481 .ndo_uninit = ip6gre_tunnel_uninit,
1482 .ndo_start_xmit = ip6gre_tunnel_xmit,
1483 .ndo_set_mac_address = eth_mac_addr,
1484 .ndo_validate_addr = eth_validate_addr,
1485 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
f61dd388 1486 .ndo_get_stats64 = ip_tunnel_get_stats64,
ecf2c06a 1487 .ndo_get_iflink = ip6_tnl_get_iflink,
c12b395a 1488};
1489
1490static void ip6gre_tap_setup(struct net_device *dev)
1491{
1492
1493 ether_setup(dev);
1494
1495 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1496 dev->destructor = ip6gre_dev_free;
1497
c12b395a 1498 dev->features |= NETIF_F_NETNS_LOCAL;
1499}
1500
1501static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1502 struct nlattr *tb[], struct nlattr *data[])
1503{
1504 struct ip6_tnl *nt;
1505 struct net *net = dev_net(dev);
1506 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1507 int err;
1508
1509 nt = netdev_priv(dev);
1510 ip6gre_netlink_parms(data, &nt->parms);
1511
1512 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1513 return -EEXIST;
1514
1515 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1516 eth_hw_addr_random(dev);
1517
1518 nt->dev = dev;
0bd87628 1519 nt->net = dev_net(dev);
c12b395a 1520 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1521
1522 /* Can use a lockless transmit, unless we generate output sequences */
1523 if (!(nt->parms.o_flags & GRE_SEQ))
1524 dev->features |= NETIF_F_LLTX;
1525
1526 err = register_netdevice(dev);
1527 if (err)
1528 goto out;
1529
1530 dev_hold(dev);
1531 ip6gre_tunnel_link(ign, nt);
1532
1533out:
1534 return err;
1535}
1536
1537static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1538 struct nlattr *data[])
1539{
22f08069
ND		 1540 struct ip6_tnl *t, *nt = netdev_priv(dev);
1541 struct net *net = nt->net;
c12b395a 1542 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1543 struct __ip6_tnl_parm p;
1544
1545 if (dev == ign->fb_tunnel_dev)
1546 return -EINVAL;
1547
c12b395a 1548 ip6gre_netlink_parms(data, &p);
1549
1550 t = ip6gre_tunnel_locate(net, &p, 0);
1551
1552 if (t) {
1553 if (t->dev != dev)
1554 return -EEXIST;
1555 } else {
1556 t = nt;
1557
1558 ip6gre_tunnel_unlink(ign, t);
1559 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1560 ip6gre_tunnel_link(ign, t);
1561 netdev_state_change(dev);
1562 }
1563
1564 return 0;
1565}
1566
54d63f78
ND		 1567static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
1568{
1569 struct net *net = dev_net(dev);
1570 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1571
1572 if (dev != ign->fb_tunnel_dev)
1573 unregister_netdevice_queue(dev, head);
1574}
1575
c12b395a 1576static size_t ip6gre_get_size(const struct net_device *dev)
1577{
1578 return
1579 /* IFLA_GRE_LINK */
1580 nla_total_size(4) +
1581 /* IFLA_GRE_IFLAGS */
1582 nla_total_size(2) +
1583 /* IFLA_GRE_OFLAGS */
1584 nla_total_size(2) +
1585 /* IFLA_GRE_IKEY */
1586 nla_total_size(4) +
1587 /* IFLA_GRE_OKEY */
1588 nla_total_size(4) +
1589 /* IFLA_GRE_LOCAL */
a3754133 1590 nla_total_size(sizeof(struct in6_addr)) +
c12b395a 1591 /* IFLA_GRE_REMOTE */
a3754133 1592 nla_total_size(sizeof(struct in6_addr)) +
c12b395a 1593 /* IFLA_GRE_TTL */
1594 nla_total_size(1) +
1595 /* IFLA_GRE_TOS */
1596 nla_total_size(1) +
1597 /* IFLA_GRE_ENCAP_LIMIT */
1598 nla_total_size(1) +
1599 /* IFLA_GRE_FLOWINFO */
1600 nla_total_size(4) +
1601 /* IFLA_GRE_FLAGS */
1602 nla_total_size(4) +
1603 0;
1604}
1605
1606static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1607{
1608 struct ip6_tnl *t = netdev_priv(dev);
1609 struct __ip6_tnl_parm *p = &t->parms;
1610
1611 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1612 nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) ||
1613 nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) ||
1614 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1615 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
930345ea
JB		 1616 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
1617 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
c12b395a 1618 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1619 /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/
1620 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1621 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1622 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags))
1623 goto nla_put_failure;
1624 return 0;
1625
1626nla_put_failure:
1627 return -EMSGSIZE;
1628}
1629
1630static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1631 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1632 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1633 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1634 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1635 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1636 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1637 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1638 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1639 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1640 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1641 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1642};
1643
1644static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1645 .kind = "ip6gre",
1646 .maxtype = IFLA_GRE_MAX,
1647 .policy = ip6gre_policy,
1648 .priv_size = sizeof(struct ip6_tnl),
1649 .setup = ip6gre_tunnel_setup,
1650 .validate = ip6gre_tunnel_validate,
1651 .newlink = ip6gre_newlink,
1652 .changelink = ip6gre_changelink,
54d63f78 1653 .dellink = ip6gre_dellink,
c12b395a 1654 .get_size = ip6gre_get_size,
1655 .fill_info = ip6gre_fill_info,
1728d4fa 1656 .get_link_net = ip6_tnl_get_link_net,
c12b395a 1657};
1658
1659static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1660 .kind = "ip6gretap",
1661 .maxtype = IFLA_GRE_MAX,
1662 .policy = ip6gre_policy,
1663 .priv_size = sizeof(struct ip6_tnl),
1664 .setup = ip6gre_tap_setup,
1665 .validate = ip6gre_tap_validate,
1666 .newlink = ip6gre_newlink,
1667 .changelink = ip6gre_changelink,
1668 .get_size = ip6gre_get_size,
1669 .fill_info = ip6gre_fill_info,
3390e397 1670 .get_link_net = ip6_tnl_get_link_net,
c12b395a 1671};
1672
1673/*
1674 * And now the modules code and kernel interface.
1675 */
1676
1677static int __init ip6gre_init(void)
1678{
1679 int err;
1680
1681 pr_info("GRE over IPv6 tunneling driver\n");
1682
1683 err = register_pernet_device(&ip6gre_net_ops);
1684 if (err < 0)
1685 return err;
1686
1687 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1688 if (err < 0) {
1689 pr_info("%s: can't add protocol\n", __func__);
1690 goto add_proto_failed;
1691 }
1692
1693 err = rtnl_link_register(&ip6gre_link_ops);
1694 if (err < 0)
1695 goto rtnl_link_failed;
1696
1697 err = rtnl_link_register(&ip6gre_tap_ops);
1698 if (err < 0)
1699 goto tap_ops_failed;
1700
1701out:
1702 return err;
1703
1704tap_ops_failed:
1705 rtnl_link_unregister(&ip6gre_link_ops);
1706rtnl_link_failed:
1707 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1708add_proto_failed:
1709 unregister_pernet_device(&ip6gre_net_ops);
1710 goto out;
1711}
1712
1713static void __exit ip6gre_fini(void)
1714{
1715 rtnl_link_unregister(&ip6gre_tap_ops);
1716 rtnl_link_unregister(&ip6gre_link_ops);
1717 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1718 unregister_pernet_device(&ip6gre_net_ops);
1719}
1720
1721module_init(ip6gre_init);
1722module_exit(ip6gre_fini);
1723MODULE_LICENSE("GPL");
1724MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1725MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1726MODULE_ALIAS_RTNL_LINK("ip6gre");
5a4ee9a9 1727MODULE_ALIAS_RTNL_LINK("ip6gretap");
c12b395a 1728MODULE_ALIAS_NETDEV("ip6gre0");
Linux 6.x block layer and io_uring tree(s)