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Merge git://git.infradead.org/users/willy/linux-nvme
[deliverable/linux.git] / net / ipv6 / ip6_gre.c
1 /*
2 * GRE over IPv6 protocol decoder.
3 *
4 * Authors: Dmitry Kozlov (xeb@mail.ru)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 */
12
13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15 #include <linux/capability.h>
16 #include <linux/module.h>
17 #include <linux/types.h>
18 #include <linux/kernel.h>
19 #include <linux/slab.h>
20 #include <linux/uaccess.h>
21 #include <linux/skbuff.h>
22 #include <linux/netdevice.h>
23 #include <linux/in.h>
24 #include <linux/tcp.h>
25 #include <linux/udp.h>
26 #include <linux/if_arp.h>
27 #include <linux/mroute.h>
28 #include <linux/init.h>
29 #include <linux/in6.h>
30 #include <linux/inetdevice.h>
31 #include <linux/igmp.h>
32 #include <linux/netfilter_ipv4.h>
33 #include <linux/etherdevice.h>
34 #include <linux/if_ether.h>
35 #include <linux/hash.h>
36 #include <linux/if_tunnel.h>
37 #include <linux/ip6_tunnel.h>
38
39 #include <net/sock.h>
40 #include <net/ip.h>
41 #include <net/ip_tunnels.h>
42 #include <net/icmp.h>
43 #include <net/protocol.h>
44 #include <net/addrconf.h>
45 #include <net/arp.h>
46 #include <net/checksum.h>
47 #include <net/dsfield.h>
48 #include <net/inet_ecn.h>
49 #include <net/xfrm.h>
50 #include <net/net_namespace.h>
51 #include <net/netns/generic.h>
52 #include <net/rtnetlink.h>
53
54 #include <net/ipv6.h>
55 #include <net/ip6_fib.h>
56 #include <net/ip6_route.h>
57 #include <net/ip6_tunnel.h>
58
59
60 static bool log_ecn_error = true;
61 module_param(log_ecn_error, bool, 0644);
62 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
63
64 #define HASH_SIZE_SHIFT 5
65 #define HASH_SIZE (1 << HASH_SIZE_SHIFT)
66
67 static int ip6gre_net_id __read_mostly;
68 struct ip6gre_net {
69 struct ip6_tnl __rcu *tunnels[4][HASH_SIZE];
70
71 struct net_device *fb_tunnel_dev;
72 };
73
74 static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
75 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
76 static int ip6gre_tunnel_init(struct net_device *dev);
77 static void ip6gre_tunnel_setup(struct net_device *dev);
78 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
79 static 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))
100 static 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]
111
112 /* Given src, dst and key, find appropriate for input tunnel. */
113
114 static 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
128 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
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
153 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
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
177 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
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
203 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
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
226 if (cand != NULL)
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
236 static 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
254 static 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
260 static 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
268 static 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
283 static 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
308 static 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);
317 if (t || !create)
318 return t;
319
320 if (parms->name[0])
321 strlcpy(name, parms->name, IFNAMSIZ);
322 else
323 strcpy(name, "ip6gre%d");
324
325 dev = alloc_netdev(sizeof(*t), name, ip6gre_tunnel_setup);
326 if (!dev)
327 return NULL;
328
329 dev_net_set(dev, net);
330
331 nt = netdev_priv(dev);
332 nt->parms = *parms;
333 dev->rtnl_link_ops = &ip6gre_link_ops;
334
335 nt->dev = dev;
336 nt->net = dev_net(dev);
337 ip6gre_tnl_link_config(nt, 1);
338
339 if (register_netdevice(dev) < 0)
340 goto failed_free;
341
342 /* Can use a lockless transmit, unless we generate output sequences */
343 if (!(nt->parms.o_flags & GRE_SEQ))
344 dev->features |= NETIF_F_LLTX;
345
346 dev_hold(dev);
347 ip6gre_tunnel_link(ign, nt);
348 return nt;
349
350 failed_free:
351 free_netdev(dev);
352 return NULL;
353 }
354
355 static void ip6gre_tunnel_uninit(struct net_device *dev)
356 {
357 struct ip6_tnl *t = netdev_priv(dev);
358 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
359
360 ip6gre_tunnel_unlink(ign, t);
361 dev_put(dev);
362 }
363
364
365 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
366 u8 type, u8 code, int offset, __be32 info)
367 {
368 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
369 __be16 *p = (__be16 *)(skb->data + offset);
370 int grehlen = offset + 4;
371 struct ip6_tnl *t;
372 __be16 flags;
373
374 flags = p[0];
375 if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) {
376 if (flags&(GRE_VERSION|GRE_ROUTING))
377 return;
378 if (flags&GRE_KEY) {
379 grehlen += 4;
380 if (flags&GRE_CSUM)
381 grehlen += 4;
382 }
383 }
384
385 /* If only 8 bytes returned, keyed message will be dropped here */
386 if (!pskb_may_pull(skb, grehlen))
387 return;
388 ipv6h = (const struct ipv6hdr *)skb->data;
389 p = (__be16 *)(skb->data + offset);
390
391 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
392 flags & GRE_KEY ?
393 *(((__be32 *)p) + (grehlen / 4) - 1) : 0,
394 p[1]);
395 if (t == NULL)
396 return;
397
398 switch (type) {
399 __u32 teli;
400 struct ipv6_tlv_tnl_enc_lim *tel;
401 __u32 mtu;
402 case ICMPV6_DEST_UNREACH:
403 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
404 t->parms.name);
405 break;
406 case ICMPV6_TIME_EXCEED:
407 if (code == ICMPV6_EXC_HOPLIMIT) {
408 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
409 t->parms.name);
410 }
411 break;
412 case ICMPV6_PARAMPROB:
413 teli = 0;
414 if (code == ICMPV6_HDR_FIELD)
415 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
416
417 if (teli && teli == info - 2) {
418 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
419 if (tel->encap_limit == 0) {
420 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
421 t->parms.name);
422 }
423 } else {
424 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
425 t->parms.name);
426 }
427 break;
428 case ICMPV6_PKT_TOOBIG:
429 mtu = info - offset;
430 if (mtu < IPV6_MIN_MTU)
431 mtu = IPV6_MIN_MTU;
432 t->dev->mtu = mtu;
433 break;
434 }
435
436 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
437 t->err_count++;
438 else
439 t->err_count = 1;
440 t->err_time = jiffies;
441 }
442
443 static int ip6gre_rcv(struct sk_buff *skb)
444 {
445 const struct ipv6hdr *ipv6h;
446 u8 *h;
447 __be16 flags;
448 __sum16 csum = 0;
449 __be32 key = 0;
450 u32 seqno = 0;
451 struct ip6_tnl *tunnel;
452 int offset = 4;
453 __be16 gre_proto;
454 int err;
455
456 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
457 goto drop;
458
459 ipv6h = ipv6_hdr(skb);
460 h = skb->data;
461 flags = *(__be16 *)h;
462
463 if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) {
464 /* - Version must be 0.
465 - We do not support routing headers.
466 */
467 if (flags&(GRE_VERSION|GRE_ROUTING))
468 goto drop;
469
470 if (flags&GRE_CSUM) {
471 csum = skb_checksum_simple_validate(skb);
472 offset += 4;
473 }
474 if (flags&GRE_KEY) {
475 key = *(__be32 *)(h + offset);
476 offset += 4;
477 }
478 if (flags&GRE_SEQ) {
479 seqno = ntohl(*(__be32 *)(h + offset));
480 offset += 4;
481 }
482 }
483
484 gre_proto = *(__be16 *)(h + 2);
485
486 tunnel = ip6gre_tunnel_lookup(skb->dev,
487 &ipv6h->saddr, &ipv6h->daddr, key,
488 gre_proto);
489 if (tunnel) {
490 struct pcpu_sw_netstats *tstats;
491
492 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
493 goto drop;
494
495 if (!ip6_tnl_rcv_ctl(tunnel, &ipv6h->daddr, &ipv6h->saddr)) {
496 tunnel->dev->stats.rx_dropped++;
497 goto drop;
498 }
499
500 skb->protocol = gre_proto;
501 /* WCCP version 1 and 2 protocol decoding.
502 * - Change protocol to IP
503 * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
504 */
505 if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) {
506 skb->protocol = htons(ETH_P_IP);
507 if ((*(h + offset) & 0xF0) != 0x40)
508 offset += 4;
509 }
510
511 skb->mac_header = skb->network_header;
512 __pskb_pull(skb, offset);
513 skb_postpull_rcsum(skb, skb_transport_header(skb), offset);
514
515 if (((flags&GRE_CSUM) && csum) ||
516 (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) {
517 tunnel->dev->stats.rx_crc_errors++;
518 tunnel->dev->stats.rx_errors++;
519 goto drop;
520 }
521 if (tunnel->parms.i_flags&GRE_SEQ) {
522 if (!(flags&GRE_SEQ) ||
523 (tunnel->i_seqno &&
524 (s32)(seqno - tunnel->i_seqno) < 0)) {
525 tunnel->dev->stats.rx_fifo_errors++;
526 tunnel->dev->stats.rx_errors++;
527 goto drop;
528 }
529 tunnel->i_seqno = seqno + 1;
530 }
531
532 /* Warning: All skb pointers will be invalidated! */
533 if (tunnel->dev->type == ARPHRD_ETHER) {
534 if (!pskb_may_pull(skb, ETH_HLEN)) {
535 tunnel->dev->stats.rx_length_errors++;
536 tunnel->dev->stats.rx_errors++;
537 goto drop;
538 }
539
540 ipv6h = ipv6_hdr(skb);
541 skb->protocol = eth_type_trans(skb, tunnel->dev);
542 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
543 }
544
545 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
546
547 skb_reset_network_header(skb);
548
549 err = IP6_ECN_decapsulate(ipv6h, skb);
550 if (unlikely(err)) {
551 if (log_ecn_error)
552 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
553 &ipv6h->saddr,
554 ipv6_get_dsfield(ipv6h));
555 if (err > 1) {
556 ++tunnel->dev->stats.rx_frame_errors;
557 ++tunnel->dev->stats.rx_errors;
558 goto drop;
559 }
560 }
561
562 tstats = this_cpu_ptr(tunnel->dev->tstats);
563 u64_stats_update_begin(&tstats->syncp);
564 tstats->rx_packets++;
565 tstats->rx_bytes += skb->len;
566 u64_stats_update_end(&tstats->syncp);
567
568 netif_rx(skb);
569
570 return 0;
571 }
572 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
573
574 drop:
575 kfree_skb(skb);
576 return 0;
577 }
578
579 struct ipv6_tel_txoption {
580 struct ipv6_txoptions ops;
581 __u8 dst_opt[8];
582 };
583
584 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
585 {
586 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
587
588 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
589 opt->dst_opt[3] = 1;
590 opt->dst_opt[4] = encap_limit;
591 opt->dst_opt[5] = IPV6_TLV_PADN;
592 opt->dst_opt[6] = 1;
593
594 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
595 opt->ops.opt_nflen = 8;
596 }
597
598 static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
599 struct net_device *dev,
600 __u8 dsfield,
601 struct flowi6 *fl6,
602 int encap_limit,
603 __u32 *pmtu)
604 {
605 struct ip6_tnl *tunnel = netdev_priv(dev);
606 struct net *net = tunnel->net;
607 struct net_device *tdev; /* Device to other host */
608 struct ipv6hdr *ipv6h; /* Our new IP header */
609 unsigned int max_headroom = 0; /* The extra header space needed */
610 int gre_hlen;
611 struct ipv6_tel_txoption opt;
612 int mtu;
613 struct dst_entry *dst = NULL, *ndst = NULL;
614 struct net_device_stats *stats = &tunnel->dev->stats;
615 int err = -1;
616 u8 proto;
617 struct sk_buff *new_skb;
618
619 if (dev->type == ARPHRD_ETHER)
620 IPCB(skb)->flags = 0;
621
622 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) {
623 gre_hlen = 0;
624 ipv6h = (struct ipv6hdr *)skb->data;
625 fl6->daddr = ipv6h->daddr;
626 } else {
627 gre_hlen = tunnel->hlen;
628 fl6->daddr = tunnel->parms.raddr;
629 }
630
631 if (!fl6->flowi6_mark)
632 dst = ip6_tnl_dst_check(tunnel);
633
634 if (!dst) {
635 ndst = ip6_route_output(net, NULL, fl6);
636
637 if (ndst->error)
638 goto tx_err_link_failure;
639 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
640 if (IS_ERR(ndst)) {
641 err = PTR_ERR(ndst);
642 ndst = NULL;
643 goto tx_err_link_failure;
644 }
645 dst = ndst;
646 }
647
648 tdev = dst->dev;
649
650 if (tdev == dev) {
651 stats->collisions++;
652 net_warn_ratelimited("%s: Local routing loop detected!\n",
653 tunnel->parms.name);
654 goto tx_err_dst_release;
655 }
656
657 mtu = dst_mtu(dst) - sizeof(*ipv6h);
658 if (encap_limit >= 0) {
659 max_headroom += 8;
660 mtu -= 8;
661 }
662 if (mtu < IPV6_MIN_MTU)
663 mtu = IPV6_MIN_MTU;
664 if (skb_dst(skb))
665 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
666 if (skb->len > mtu) {
667 *pmtu = mtu;
668 err = -EMSGSIZE;
669 goto tx_err_dst_release;
670 }
671
672 if (tunnel->err_count > 0) {
673 if (time_before(jiffies,
674 tunnel->err_time + IP6TUNNEL_ERR_TIMEO)) {
675 tunnel->err_count--;
676
677 dst_link_failure(skb);
678 } else
679 tunnel->err_count = 0;
680 }
681
682 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
683
684 max_headroom += LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len;
685
686 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
687 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
688 new_skb = skb_realloc_headroom(skb, max_headroom);
689 if (max_headroom > dev->needed_headroom)
690 dev->needed_headroom = max_headroom;
691 if (!new_skb)
692 goto tx_err_dst_release;
693
694 if (skb->sk)
695 skb_set_owner_w(new_skb, skb->sk);
696 consume_skb(skb);
697 skb = new_skb;
698 }
699
700 if (fl6->flowi6_mark) {
701 skb_dst_set(skb, dst);
702 ndst = NULL;
703 } else {
704 skb_dst_set_noref(skb, dst);
705 }
706
707 proto = NEXTHDR_GRE;
708 if (encap_limit >= 0) {
709 init_tel_txopt(&opt, encap_limit);
710 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
711 }
712
713 if (likely(!skb->encapsulation)) {
714 skb_reset_inner_headers(skb);
715 skb->encapsulation = 1;
716 }
717
718 skb_push(skb, gre_hlen);
719 skb_reset_network_header(skb);
720 skb_set_transport_header(skb, sizeof(*ipv6h));
721
722 /*
723 * Push down and install the IP header.
724 */
725 ipv6h = ipv6_hdr(skb);
726 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), fl6->flowlabel);
727 ipv6h->hop_limit = tunnel->parms.hop_limit;
728 ipv6h->nexthdr = proto;
729 ipv6h->saddr = fl6->saddr;
730 ipv6h->daddr = fl6->daddr;
731
732 ((__be16 *)(ipv6h + 1))[0] = tunnel->parms.o_flags;
733 ((__be16 *)(ipv6h + 1))[1] = (dev->type == ARPHRD_ETHER) ?
734 htons(ETH_P_TEB) : skb->protocol;
735
736 if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) {
737 __be32 *ptr = (__be32 *)(((u8 *)ipv6h) + tunnel->hlen - 4);
738
739 if (tunnel->parms.o_flags&GRE_SEQ) {
740 ++tunnel->o_seqno;
741 *ptr = htonl(tunnel->o_seqno);
742 ptr--;
743 }
744 if (tunnel->parms.o_flags&GRE_KEY) {
745 *ptr = tunnel->parms.o_key;
746 ptr--;
747 }
748 if (tunnel->parms.o_flags&GRE_CSUM) {
749 *ptr = 0;
750 *(__sum16 *)ptr = ip_compute_csum((void *)(ipv6h+1),
751 skb->len - sizeof(struct ipv6hdr));
752 }
753 }
754
755 ip6tunnel_xmit(skb, dev);
756 if (ndst)
757 ip6_tnl_dst_store(tunnel, ndst);
758 return 0;
759 tx_err_link_failure:
760 stats->tx_carrier_errors++;
761 dst_link_failure(skb);
762 tx_err_dst_release:
763 dst_release(ndst);
764 return err;
765 }
766
767 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
768 {
769 struct ip6_tnl *t = netdev_priv(dev);
770 const struct iphdr *iph = ip_hdr(skb);
771 int encap_limit = -1;
772 struct flowi6 fl6;
773 __u8 dsfield;
774 __u32 mtu;
775 int err;
776
777 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
778 encap_limit = t->parms.encap_limit;
779
780 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
781 fl6.flowi6_proto = IPPROTO_IPIP;
782
783 dsfield = ipv4_get_dsfield(iph);
784
785 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
786 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
787 & IPV6_TCLASS_MASK;
788 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
789 fl6.flowi6_mark = skb->mark;
790
791 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
792 if (err != 0) {
793 /* XXX: send ICMP error even if DF is not set. */
794 if (err == -EMSGSIZE)
795 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
796 htonl(mtu));
797 return -1;
798 }
799
800 return 0;
801 }
802
803 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
804 {
805 struct ip6_tnl *t = netdev_priv(dev);
806 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
807 int encap_limit = -1;
808 __u16 offset;
809 struct flowi6 fl6;
810 __u8 dsfield;
811 __u32 mtu;
812 int err;
813
814 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
815 return -1;
816
817 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
818 if (offset > 0) {
819 struct ipv6_tlv_tnl_enc_lim *tel;
820 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
821 if (tel->encap_limit == 0) {
822 icmpv6_send(skb, ICMPV6_PARAMPROB,
823 ICMPV6_HDR_FIELD, offset + 2);
824 return -1;
825 }
826 encap_limit = tel->encap_limit - 1;
827 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
828 encap_limit = t->parms.encap_limit;
829
830 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
831 fl6.flowi6_proto = IPPROTO_IPV6;
832
833 dsfield = ipv6_get_dsfield(ipv6h);
834 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
835 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
836 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
837 fl6.flowlabel |= ip6_flowlabel(ipv6h);
838 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
839 fl6.flowi6_mark = skb->mark;
840
841 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
842 if (err != 0) {
843 if (err == -EMSGSIZE)
844 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
845 return -1;
846 }
847
848 return 0;
849 }
850
851 /**
852 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
853 * @t: the outgoing tunnel device
854 * @hdr: IPv6 header from the incoming packet
855 *
856 * Description:
857 * Avoid trivial tunneling loop by checking that tunnel exit-point
858 * doesn't match source of incoming packet.
859 *
860 * Return:
861 * 1 if conflict,
862 * 0 else
863 **/
864
865 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
866 const struct ipv6hdr *hdr)
867 {
868 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
869 }
870
871 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
872 {
873 struct ip6_tnl *t = netdev_priv(dev);
874 int encap_limit = -1;
875 struct flowi6 fl6;
876 __u32 mtu;
877 int err;
878
879 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
880 encap_limit = t->parms.encap_limit;
881
882 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
883 fl6.flowi6_proto = skb->protocol;
884
885 err = ip6gre_xmit2(skb, dev, 0, &fl6, encap_limit, &mtu);
886
887 return err;
888 }
889
890 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
891 struct net_device *dev)
892 {
893 struct ip6_tnl *t = netdev_priv(dev);
894 struct net_device_stats *stats = &t->dev->stats;
895 int ret;
896
897 if (!ip6_tnl_xmit_ctl(t))
898 goto tx_err;
899
900 switch (skb->protocol) {
901 case htons(ETH_P_IP):
902 ret = ip6gre_xmit_ipv4(skb, dev);
903 break;
904 case htons(ETH_P_IPV6):
905 ret = ip6gre_xmit_ipv6(skb, dev);
906 break;
907 default:
908 ret = ip6gre_xmit_other(skb, dev);
909 break;
910 }
911
912 if (ret < 0)
913 goto tx_err;
914
915 return NETDEV_TX_OK;
916
917 tx_err:
918 stats->tx_errors++;
919 stats->tx_dropped++;
920 kfree_skb(skb);
921 return NETDEV_TX_OK;
922 }
923
924 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
925 {
926 struct net_device *dev = t->dev;
927 struct __ip6_tnl_parm *p = &t->parms;
928 struct flowi6 *fl6 = &t->fl.u.ip6;
929 int addend = sizeof(struct ipv6hdr) + 4;
930
931 if (dev->type != ARPHRD_ETHER) {
932 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
933 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
934 }
935
936 /* Set up flowi template */
937 fl6->saddr = p->laddr;
938 fl6->daddr = p->raddr;
939 fl6->flowi6_oif = p->link;
940 fl6->flowlabel = 0;
941
942 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
943 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
944 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
945 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
946
947 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
948 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
949
950 if (p->flags&IP6_TNL_F_CAP_XMIT &&
951 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
952 dev->flags |= IFF_POINTOPOINT;
953 else
954 dev->flags &= ~IFF_POINTOPOINT;
955
956 dev->iflink = p->link;
957
958 /* Precalculate GRE options length */
959 if (t->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) {
960 if (t->parms.o_flags&GRE_CSUM)
961 addend += 4;
962 if (t->parms.o_flags&GRE_KEY)
963 addend += 4;
964 if (t->parms.o_flags&GRE_SEQ)
965 addend += 4;
966 }
967 t->hlen = addend;
968
969 if (p->flags & IP6_TNL_F_CAP_XMIT) {
970 int strict = (ipv6_addr_type(&p->raddr) &
971 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
972
973 struct rt6_info *rt = rt6_lookup(t->net,
974 &p->raddr, &p->laddr,
975 p->link, strict);
976
977 if (rt == NULL)
978 return;
979
980 if (rt->dst.dev) {
981 dev->hard_header_len = rt->dst.dev->hard_header_len + addend;
982
983 if (set_mtu) {
984 dev->mtu = rt->dst.dev->mtu - addend;
985 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
986 dev->mtu -= 8;
987
988 if (dev->mtu < IPV6_MIN_MTU)
989 dev->mtu = IPV6_MIN_MTU;
990 }
991 }
992 ip6_rt_put(rt);
993 }
994 }
995
996 static int ip6gre_tnl_change(struct ip6_tnl *t,
997 const struct __ip6_tnl_parm *p, int set_mtu)
998 {
999 t->parms.laddr = p->laddr;
1000 t->parms.raddr = p->raddr;
1001 t->parms.flags = p->flags;
1002 t->parms.hop_limit = p->hop_limit;
1003 t->parms.encap_limit = p->encap_limit;
1004 t->parms.flowinfo = p->flowinfo;
1005 t->parms.link = p->link;
1006 t->parms.proto = p->proto;
1007 t->parms.i_key = p->i_key;
1008 t->parms.o_key = p->o_key;
1009 t->parms.i_flags = p->i_flags;
1010 t->parms.o_flags = p->o_flags;
1011 ip6_tnl_dst_reset(t);
1012 ip6gre_tnl_link_config(t, set_mtu);
1013 return 0;
1014 }
1015
1016 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1017 const struct ip6_tnl_parm2 *u)
1018 {
1019 p->laddr = u->laddr;
1020 p->raddr = u->raddr;
1021 p->flags = u->flags;
1022 p->hop_limit = u->hop_limit;
1023 p->encap_limit = u->encap_limit;
1024 p->flowinfo = u->flowinfo;
1025 p->link = u->link;
1026 p->i_key = u->i_key;
1027 p->o_key = u->o_key;
1028 p->i_flags = u->i_flags;
1029 p->o_flags = u->o_flags;
1030 memcpy(p->name, u->name, sizeof(u->name));
1031 }
1032
1033 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1034 const struct __ip6_tnl_parm *p)
1035 {
1036 u->proto = IPPROTO_GRE;
1037 u->laddr = p->laddr;
1038 u->raddr = p->raddr;
1039 u->flags = p->flags;
1040 u->hop_limit = p->hop_limit;
1041 u->encap_limit = p->encap_limit;
1042 u->flowinfo = p->flowinfo;
1043 u->link = p->link;
1044 u->i_key = p->i_key;
1045 u->o_key = p->o_key;
1046 u->i_flags = p->i_flags;
1047 u->o_flags = p->o_flags;
1048 memcpy(u->name, p->name, sizeof(u->name));
1049 }
1050
1051 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1052 struct ifreq *ifr, int cmd)
1053 {
1054 int err = 0;
1055 struct ip6_tnl_parm2 p;
1056 struct __ip6_tnl_parm p1;
1057 struct ip6_tnl *t = netdev_priv(dev);
1058 struct net *net = t->net;
1059 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1060
1061 switch (cmd) {
1062 case SIOCGETTUNNEL:
1063 if (dev == ign->fb_tunnel_dev) {
1064 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1065 err = -EFAULT;
1066 break;
1067 }
1068 ip6gre_tnl_parm_from_user(&p1, &p);
1069 t = ip6gre_tunnel_locate(net, &p1, 0);
1070 if (t == NULL)
1071 t = netdev_priv(dev);
1072 }
1073 memset(&p, 0, sizeof(p));
1074 ip6gre_tnl_parm_to_user(&p, &t->parms);
1075 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1076 err = -EFAULT;
1077 break;
1078
1079 case SIOCADDTUNNEL:
1080 case SIOCCHGTUNNEL:
1081 err = -EPERM;
1082 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1083 goto done;
1084
1085 err = -EFAULT;
1086 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1087 goto done;
1088
1089 err = -EINVAL;
1090 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1091 goto done;
1092
1093 if (!(p.i_flags&GRE_KEY))
1094 p.i_key = 0;
1095 if (!(p.o_flags&GRE_KEY))
1096 p.o_key = 0;
1097
1098 ip6gre_tnl_parm_from_user(&p1, &p);
1099 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1100
1101 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1102 if (t != NULL) {
1103 if (t->dev != dev) {
1104 err = -EEXIST;
1105 break;
1106 }
1107 } else {
1108 t = netdev_priv(dev);
1109
1110 ip6gre_tunnel_unlink(ign, t);
1111 synchronize_net();
1112 ip6gre_tnl_change(t, &p1, 1);
1113 ip6gre_tunnel_link(ign, t);
1114 netdev_state_change(dev);
1115 }
1116 }
1117
1118 if (t) {
1119 err = 0;
1120
1121 memset(&p, 0, sizeof(p));
1122 ip6gre_tnl_parm_to_user(&p, &t->parms);
1123 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1124 err = -EFAULT;
1125 } else
1126 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1127 break;
1128
1129 case SIOCDELTUNNEL:
1130 err = -EPERM;
1131 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1132 goto done;
1133
1134 if (dev == ign->fb_tunnel_dev) {
1135 err = -EFAULT;
1136 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1137 goto done;
1138 err = -ENOENT;
1139 ip6gre_tnl_parm_from_user(&p1, &p);
1140 t = ip6gre_tunnel_locate(net, &p1, 0);
1141 if (t == NULL)
1142 goto done;
1143 err = -EPERM;
1144 if (t == netdev_priv(ign->fb_tunnel_dev))
1145 goto done;
1146 dev = t->dev;
1147 }
1148 unregister_netdevice(dev);
1149 err = 0;
1150 break;
1151
1152 default:
1153 err = -EINVAL;
1154 }
1155
1156 done:
1157 return err;
1158 }
1159
1160 static int ip6gre_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1161 {
1162 if (new_mtu < 68 ||
1163 new_mtu > 0xFFF8 - dev->hard_header_len)
1164 return -EINVAL;
1165 dev->mtu = new_mtu;
1166 return 0;
1167 }
1168
1169 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1170 unsigned short type,
1171 const void *daddr, const void *saddr, unsigned int len)
1172 {
1173 struct ip6_tnl *t = netdev_priv(dev);
1174 struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen);
1175 __be16 *p = (__be16 *)(ipv6h+1);
1176
1177 ip6_flow_hdr(ipv6h, 0, t->fl.u.ip6.flowlabel);
1178 ipv6h->hop_limit = t->parms.hop_limit;
1179 ipv6h->nexthdr = NEXTHDR_GRE;
1180 ipv6h->saddr = t->parms.laddr;
1181 ipv6h->daddr = t->parms.raddr;
1182
1183 p[0] = t->parms.o_flags;
1184 p[1] = htons(type);
1185
1186 /*
1187 * Set the source hardware address.
1188 */
1189
1190 if (saddr)
1191 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1192 if (daddr)
1193 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1194 if (!ipv6_addr_any(&ipv6h->daddr))
1195 return t->hlen;
1196
1197 return -t->hlen;
1198 }
1199
1200 static const struct header_ops ip6gre_header_ops = {
1201 .create = ip6gre_header,
1202 };
1203
1204 static const struct net_device_ops ip6gre_netdev_ops = {
1205 .ndo_init = ip6gre_tunnel_init,
1206 .ndo_uninit = ip6gre_tunnel_uninit,
1207 .ndo_start_xmit = ip6gre_tunnel_xmit,
1208 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1209 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1210 .ndo_get_stats64 = ip_tunnel_get_stats64,
1211 };
1212
1213 static void ip6gre_dev_free(struct net_device *dev)
1214 {
1215 free_percpu(dev->tstats);
1216 free_netdev(dev);
1217 }
1218
1219 static void ip6gre_tunnel_setup(struct net_device *dev)
1220 {
1221 struct ip6_tnl *t;
1222
1223 dev->netdev_ops = &ip6gre_netdev_ops;
1224 dev->destructor = ip6gre_dev_free;
1225
1226 dev->type = ARPHRD_IP6GRE;
1227 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr) + 4;
1228 dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr) - 4;
1229 t = netdev_priv(dev);
1230 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1231 dev->mtu -= 8;
1232 dev->flags |= IFF_NOARP;
1233 dev->iflink = 0;
1234 dev->addr_len = sizeof(struct in6_addr);
1235 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1236 }
1237
1238 static int ip6gre_tunnel_init(struct net_device *dev)
1239 {
1240 struct ip6_tnl *tunnel;
1241 int i;
1242
1243 tunnel = netdev_priv(dev);
1244
1245 tunnel->dev = dev;
1246 tunnel->net = dev_net(dev);
1247 strcpy(tunnel->parms.name, dev->name);
1248
1249 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1250 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1251
1252 if (ipv6_addr_any(&tunnel->parms.raddr))
1253 dev->header_ops = &ip6gre_header_ops;
1254
1255 dev->tstats = alloc_percpu(struct pcpu_sw_netstats);
1256 if (!dev->tstats)
1257 return -ENOMEM;
1258
1259 for_each_possible_cpu(i) {
1260 struct pcpu_sw_netstats *ip6gre_tunnel_stats;
1261 ip6gre_tunnel_stats = per_cpu_ptr(dev->tstats, i);
1262 u64_stats_init(&ip6gre_tunnel_stats->syncp);
1263 }
1264
1265
1266 return 0;
1267 }
1268
1269 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1270 {
1271 struct ip6_tnl *tunnel = netdev_priv(dev);
1272
1273 tunnel->dev = dev;
1274 tunnel->net = dev_net(dev);
1275 strcpy(tunnel->parms.name, dev->name);
1276
1277 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1278
1279 dev_hold(dev);
1280 }
1281
1282
1283 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1284 .handler = ip6gre_rcv,
1285 .err_handler = ip6gre_err,
1286 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1287 };
1288
1289 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1290 {
1291 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1292 struct net_device *dev, *aux;
1293 int prio;
1294
1295 for_each_netdev_safe(net, dev, aux)
1296 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1297 dev->rtnl_link_ops == &ip6gre_tap_ops)
1298 unregister_netdevice_queue(dev, head);
1299
1300 for (prio = 0; prio < 4; prio++) {
1301 int h;
1302 for (h = 0; h < HASH_SIZE; h++) {
1303 struct ip6_tnl *t;
1304
1305 t = rtnl_dereference(ign->tunnels[prio][h]);
1306
1307 while (t != NULL) {
1308 /* If dev is in the same netns, it has already
1309 * been added to the list by the previous loop.
1310 */
1311 if (!net_eq(dev_net(t->dev), net))
1312 unregister_netdevice_queue(t->dev,
1313 head);
1314 t = rtnl_dereference(t->next);
1315 }
1316 }
1317 }
1318 }
1319
1320 static int __net_init ip6gre_init_net(struct net *net)
1321 {
1322 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1323 int err;
1324
1325 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1326 ip6gre_tunnel_setup);
1327 if (!ign->fb_tunnel_dev) {
1328 err = -ENOMEM;
1329 goto err_alloc_dev;
1330 }
1331 dev_net_set(ign->fb_tunnel_dev, net);
1332 /* FB netdevice is special: we have one, and only one per netns.
1333 * Allowing to move it to another netns is clearly unsafe.
1334 */
1335 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1336
1337
1338 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1339 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1340
1341 err = register_netdev(ign->fb_tunnel_dev);
1342 if (err)
1343 goto err_reg_dev;
1344
1345 rcu_assign_pointer(ign->tunnels_wc[0],
1346 netdev_priv(ign->fb_tunnel_dev));
1347 return 0;
1348
1349 err_reg_dev:
1350 ip6gre_dev_free(ign->fb_tunnel_dev);
1351 err_alloc_dev:
1352 return err;
1353 }
1354
1355 static void __net_exit ip6gre_exit_net(struct net *net)
1356 {
1357 LIST_HEAD(list);
1358
1359 rtnl_lock();
1360 ip6gre_destroy_tunnels(net, &list);
1361 unregister_netdevice_many(&list);
1362 rtnl_unlock();
1363 }
1364
1365 static struct pernet_operations ip6gre_net_ops = {
1366 .init = ip6gre_init_net,
1367 .exit = ip6gre_exit_net,
1368 .id = &ip6gre_net_id,
1369 .size = sizeof(struct ip6gre_net),
1370 };
1371
1372 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
1373 {
1374 __be16 flags;
1375
1376 if (!data)
1377 return 0;
1378
1379 flags = 0;
1380 if (data[IFLA_GRE_IFLAGS])
1381 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1382 if (data[IFLA_GRE_OFLAGS])
1383 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1384 if (flags & (GRE_VERSION|GRE_ROUTING))
1385 return -EINVAL;
1386
1387 return 0;
1388 }
1389
1390 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
1391 {
1392 struct in6_addr daddr;
1393
1394 if (tb[IFLA_ADDRESS]) {
1395 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1396 return -EINVAL;
1397 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1398 return -EADDRNOTAVAIL;
1399 }
1400
1401 if (!data)
1402 goto out;
1403
1404 if (data[IFLA_GRE_REMOTE]) {
1405 nla_memcpy(&daddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1406 if (ipv6_addr_any(&daddr))
1407 return -EINVAL;
1408 }
1409
1410 out:
1411 return ip6gre_tunnel_validate(tb, data);
1412 }
1413
1414
1415 static void ip6gre_netlink_parms(struct nlattr *data[],
1416 struct __ip6_tnl_parm *parms)
1417 {
1418 memset(parms, 0, sizeof(*parms));
1419
1420 if (!data)
1421 return;
1422
1423 if (data[IFLA_GRE_LINK])
1424 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1425
1426 if (data[IFLA_GRE_IFLAGS])
1427 parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]);
1428
1429 if (data[IFLA_GRE_OFLAGS])
1430 parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]);
1431
1432 if (data[IFLA_GRE_IKEY])
1433 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1434
1435 if (data[IFLA_GRE_OKEY])
1436 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1437
1438 if (data[IFLA_GRE_LOCAL])
1439 nla_memcpy(&parms->laddr, data[IFLA_GRE_LOCAL], sizeof(struct in6_addr));
1440
1441 if (data[IFLA_GRE_REMOTE])
1442 nla_memcpy(&parms->raddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1443
1444 if (data[IFLA_GRE_TTL])
1445 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1446
1447 if (data[IFLA_GRE_ENCAP_LIMIT])
1448 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1449
1450 if (data[IFLA_GRE_FLOWINFO])
1451 parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]);
1452
1453 if (data[IFLA_GRE_FLAGS])
1454 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1455 }
1456
1457 static int ip6gre_tap_init(struct net_device *dev)
1458 {
1459 struct ip6_tnl *tunnel;
1460
1461 tunnel = netdev_priv(dev);
1462
1463 tunnel->dev = dev;
1464 tunnel->net = dev_net(dev);
1465 strcpy(tunnel->parms.name, dev->name);
1466
1467 ip6gre_tnl_link_config(tunnel, 1);
1468
1469 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1470 if (!dev->tstats)
1471 return -ENOMEM;
1472
1473 return 0;
1474 }
1475
1476 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1477 .ndo_init = ip6gre_tap_init,
1478 .ndo_uninit = ip6gre_tunnel_uninit,
1479 .ndo_start_xmit = ip6gre_tunnel_xmit,
1480 .ndo_set_mac_address = eth_mac_addr,
1481 .ndo_validate_addr = eth_validate_addr,
1482 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1483 .ndo_get_stats64 = ip_tunnel_get_stats64,
1484 };
1485
1486 static void ip6gre_tap_setup(struct net_device *dev)
1487 {
1488
1489 ether_setup(dev);
1490
1491 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1492 dev->destructor = ip6gre_dev_free;
1493
1494 dev->iflink = 0;
1495 dev->features |= NETIF_F_NETNS_LOCAL;
1496 }
1497
1498 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1499 struct nlattr *tb[], struct nlattr *data[])
1500 {
1501 struct ip6_tnl *nt;
1502 struct net *net = dev_net(dev);
1503 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1504 int err;
1505
1506 nt = netdev_priv(dev);
1507 ip6gre_netlink_parms(data, &nt->parms);
1508
1509 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1510 return -EEXIST;
1511
1512 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1513 eth_hw_addr_random(dev);
1514
1515 nt->dev = dev;
1516 nt->net = dev_net(dev);
1517 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1518
1519 /* Can use a lockless transmit, unless we generate output sequences */
1520 if (!(nt->parms.o_flags & GRE_SEQ))
1521 dev->features |= NETIF_F_LLTX;
1522
1523 err = register_netdevice(dev);
1524 if (err)
1525 goto out;
1526
1527 dev_hold(dev);
1528 ip6gre_tunnel_link(ign, nt);
1529
1530 out:
1531 return err;
1532 }
1533
1534 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1535 struct nlattr *data[])
1536 {
1537 struct ip6_tnl *t, *nt = netdev_priv(dev);
1538 struct net *net = nt->net;
1539 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1540 struct __ip6_tnl_parm p;
1541
1542 if (dev == ign->fb_tunnel_dev)
1543 return -EINVAL;
1544
1545 ip6gre_netlink_parms(data, &p);
1546
1547 t = ip6gre_tunnel_locate(net, &p, 0);
1548
1549 if (t) {
1550 if (t->dev != dev)
1551 return -EEXIST;
1552 } else {
1553 t = nt;
1554
1555 ip6gre_tunnel_unlink(ign, t);
1556 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1557 ip6gre_tunnel_link(ign, t);
1558 netdev_state_change(dev);
1559 }
1560
1561 return 0;
1562 }
1563
1564 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
1565 {
1566 struct net *net = dev_net(dev);
1567 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1568
1569 if (dev != ign->fb_tunnel_dev)
1570 unregister_netdevice_queue(dev, head);
1571 }
1572
1573 static size_t ip6gre_get_size(const struct net_device *dev)
1574 {
1575 return
1576 /* IFLA_GRE_LINK */
1577 nla_total_size(4) +
1578 /* IFLA_GRE_IFLAGS */
1579 nla_total_size(2) +
1580 /* IFLA_GRE_OFLAGS */
1581 nla_total_size(2) +
1582 /* IFLA_GRE_IKEY */
1583 nla_total_size(4) +
1584 /* IFLA_GRE_OKEY */
1585 nla_total_size(4) +
1586 /* IFLA_GRE_LOCAL */
1587 nla_total_size(sizeof(struct in6_addr)) +
1588 /* IFLA_GRE_REMOTE */
1589 nla_total_size(sizeof(struct in6_addr)) +
1590 /* IFLA_GRE_TTL */
1591 nla_total_size(1) +
1592 /* IFLA_GRE_TOS */
1593 nla_total_size(1) +
1594 /* IFLA_GRE_ENCAP_LIMIT */
1595 nla_total_size(1) +
1596 /* IFLA_GRE_FLOWINFO */
1597 nla_total_size(4) +
1598 /* IFLA_GRE_FLAGS */
1599 nla_total_size(4) +
1600 0;
1601 }
1602
1603 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1604 {
1605 struct ip6_tnl *t = netdev_priv(dev);
1606 struct __ip6_tnl_parm *p = &t->parms;
1607
1608 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1609 nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) ||
1610 nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) ||
1611 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1612 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
1613 nla_put(skb, IFLA_GRE_LOCAL, sizeof(struct in6_addr), &p->laddr) ||
1614 nla_put(skb, IFLA_GRE_REMOTE, sizeof(struct in6_addr), &p->raddr) ||
1615 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1616 /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/
1617 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1618 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1619 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags))
1620 goto nla_put_failure;
1621 return 0;
1622
1623 nla_put_failure:
1624 return -EMSGSIZE;
1625 }
1626
1627 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1628 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1629 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1630 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1631 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1632 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1633 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1634 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1635 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1636 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1637 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1638 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1639 };
1640
1641 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1642 .kind = "ip6gre",
1643 .maxtype = IFLA_GRE_MAX,
1644 .policy = ip6gre_policy,
1645 .priv_size = sizeof(struct ip6_tnl),
1646 .setup = ip6gre_tunnel_setup,
1647 .validate = ip6gre_tunnel_validate,
1648 .newlink = ip6gre_newlink,
1649 .changelink = ip6gre_changelink,
1650 .dellink = ip6gre_dellink,
1651 .get_size = ip6gre_get_size,
1652 .fill_info = ip6gre_fill_info,
1653 };
1654
1655 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1656 .kind = "ip6gretap",
1657 .maxtype = IFLA_GRE_MAX,
1658 .policy = ip6gre_policy,
1659 .priv_size = sizeof(struct ip6_tnl),
1660 .setup = ip6gre_tap_setup,
1661 .validate = ip6gre_tap_validate,
1662 .newlink = ip6gre_newlink,
1663 .changelink = ip6gre_changelink,
1664 .get_size = ip6gre_get_size,
1665 .fill_info = ip6gre_fill_info,
1666 };
1667
1668 /*
1669 * And now the modules code and kernel interface.
1670 */
1671
1672 static int __init ip6gre_init(void)
1673 {
1674 int err;
1675
1676 pr_info("GRE over IPv6 tunneling driver\n");
1677
1678 err = register_pernet_device(&ip6gre_net_ops);
1679 if (err < 0)
1680 return err;
1681
1682 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1683 if (err < 0) {
1684 pr_info("%s: can't add protocol\n", __func__);
1685 goto add_proto_failed;
1686 }
1687
1688 err = rtnl_link_register(&ip6gre_link_ops);
1689 if (err < 0)
1690 goto rtnl_link_failed;
1691
1692 err = rtnl_link_register(&ip6gre_tap_ops);
1693 if (err < 0)
1694 goto tap_ops_failed;
1695
1696 out:
1697 return err;
1698
1699 tap_ops_failed:
1700 rtnl_link_unregister(&ip6gre_link_ops);
1701 rtnl_link_failed:
1702 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1703 add_proto_failed:
1704 unregister_pernet_device(&ip6gre_net_ops);
1705 goto out;
1706 }
1707
1708 static void __exit ip6gre_fini(void)
1709 {
1710 rtnl_link_unregister(&ip6gre_tap_ops);
1711 rtnl_link_unregister(&ip6gre_link_ops);
1712 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1713 unregister_pernet_device(&ip6gre_net_ops);
1714 }
1715
1716 module_init(ip6gre_init);
1717 module_exit(ip6gre_fini);
1718 MODULE_LICENSE("GPL");
1719 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1720 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1721 MODULE_ALIAS_RTNL_LINK("ip6gre");
1722 MODULE_ALIAS_NETDEV("ip6gre0");
Linux kernel - Deliverables
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