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[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 NULL;
319 if (t || !create)
320 return t;
321
322 if (parms->name[0])
323 strlcpy(name, parms->name, IFNAMSIZ);
324 else
325 strcpy(name, "ip6gre%d");
326
327 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
328 ip6gre_tunnel_setup);
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;
339 nt->net = dev_net(dev);
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
353 failed_free:
354 free_netdev(dev);
355 return NULL;
356 }
357
358 static void ip6gre_tunnel_uninit(struct net_device *dev)
359 {
360 struct ip6_tnl *t = netdev_priv(dev);
361 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
362
363 ip6gre_tunnel_unlink(ign, t);
364 dev_put(dev);
365 }
366
367
368 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
369 u8 type, u8 code, int offset, __be32 info)
370 {
371 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
372 __be16 *p = (__be16 *)(skb->data + offset);
373 int grehlen = offset + 4;
374 struct ip6_tnl *t;
375 __be16 flags;
376
377 flags = p[0];
378 if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) {
379 if (flags&(GRE_VERSION|GRE_ROUTING))
380 return;
381 if (flags&GRE_KEY) {
382 grehlen += 4;
383 if (flags&GRE_CSUM)
384 grehlen += 4;
385 }
386 }
387
388 /* If only 8 bytes returned, keyed message will be dropped here */
389 if (!pskb_may_pull(skb, grehlen))
390 return;
391 ipv6h = (const struct ipv6hdr *)skb->data;
392 p = (__be16 *)(skb->data + offset);
393
394 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
395 flags & GRE_KEY ?
396 *(((__be32 *)p) + (grehlen / 4) - 1) : 0,
397 p[1]);
398 if (t == NULL)
399 return;
400
401 switch (type) {
402 __u32 teli;
403 struct ipv6_tlv_tnl_enc_lim *tel;
404 __u32 mtu;
405 case ICMPV6_DEST_UNREACH:
406 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
407 t->parms.name);
408 break;
409 case ICMPV6_TIME_EXCEED:
410 if (code == ICMPV6_EXC_HOPLIMIT) {
411 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
412 t->parms.name);
413 }
414 break;
415 case ICMPV6_PARAMPROB:
416 teli = 0;
417 if (code == ICMPV6_HDR_FIELD)
418 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
419
420 if (teli && teli == info - 2) {
421 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
422 if (tel->encap_limit == 0) {
423 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
424 t->parms.name);
425 }
426 } else {
427 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
428 t->parms.name);
429 }
430 break;
431 case ICMPV6_PKT_TOOBIG:
432 mtu = info - offset;
433 if (mtu < IPV6_MIN_MTU)
434 mtu = IPV6_MIN_MTU;
435 t->dev->mtu = mtu;
436 break;
437 }
438
439 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
440 t->err_count++;
441 else
442 t->err_count = 1;
443 t->err_time = jiffies;
444 }
445
446 static int ip6gre_rcv(struct sk_buff *skb)
447 {
448 const struct ipv6hdr *ipv6h;
449 u8 *h;
450 __be16 flags;
451 __sum16 csum = 0;
452 __be32 key = 0;
453 u32 seqno = 0;
454 struct ip6_tnl *tunnel;
455 int offset = 4;
456 __be16 gre_proto;
457 int err;
458
459 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
460 goto drop;
461
462 ipv6h = ipv6_hdr(skb);
463 h = skb->data;
464 flags = *(__be16 *)h;
465
466 if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) {
467 /* - Version must be 0.
468 - We do not support routing headers.
469 */
470 if (flags&(GRE_VERSION|GRE_ROUTING))
471 goto drop;
472
473 if (flags&GRE_CSUM) {
474 csum = skb_checksum_simple_validate(skb);
475 offset += 4;
476 }
477 if (flags&GRE_KEY) {
478 key = *(__be32 *)(h + offset);
479 offset += 4;
480 }
481 if (flags&GRE_SEQ) {
482 seqno = ntohl(*(__be32 *)(h + offset));
483 offset += 4;
484 }
485 }
486
487 gre_proto = *(__be16 *)(h + 2);
488
489 tunnel = ip6gre_tunnel_lookup(skb->dev,
490 &ipv6h->saddr, &ipv6h->daddr, key,
491 gre_proto);
492 if (tunnel) {
493 struct pcpu_sw_netstats *tstats;
494
495 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
496 goto drop;
497
498 if (!ip6_tnl_rcv_ctl(tunnel, &ipv6h->daddr, &ipv6h->saddr)) {
499 tunnel->dev->stats.rx_dropped++;
500 goto drop;
501 }
502
503 skb->protocol = gre_proto;
504 /* WCCP version 1 and 2 protocol decoding.
505 * - Change protocol to IP
506 * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
507 */
508 if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) {
509 skb->protocol = htons(ETH_P_IP);
510 if ((*(h + offset) & 0xF0) != 0x40)
511 offset += 4;
512 }
513
514 skb->mac_header = skb->network_header;
515 __pskb_pull(skb, offset);
516 skb_postpull_rcsum(skb, skb_transport_header(skb), offset);
517
518 if (((flags&GRE_CSUM) && csum) ||
519 (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) {
520 tunnel->dev->stats.rx_crc_errors++;
521 tunnel->dev->stats.rx_errors++;
522 goto drop;
523 }
524 if (tunnel->parms.i_flags&GRE_SEQ) {
525 if (!(flags&GRE_SEQ) ||
526 (tunnel->i_seqno &&
527 (s32)(seqno - tunnel->i_seqno) < 0)) {
528 tunnel->dev->stats.rx_fifo_errors++;
529 tunnel->dev->stats.rx_errors++;
530 goto drop;
531 }
532 tunnel->i_seqno = seqno + 1;
533 }
534
535 /* Warning: All skb pointers will be invalidated! */
536 if (tunnel->dev->type == ARPHRD_ETHER) {
537 if (!pskb_may_pull(skb, ETH_HLEN)) {
538 tunnel->dev->stats.rx_length_errors++;
539 tunnel->dev->stats.rx_errors++;
540 goto drop;
541 }
542
543 ipv6h = ipv6_hdr(skb);
544 skb->protocol = eth_type_trans(skb, tunnel->dev);
545 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
546 }
547
548 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
549
550 skb_reset_network_header(skb);
551
552 err = IP6_ECN_decapsulate(ipv6h, skb);
553 if (unlikely(err)) {
554 if (log_ecn_error)
555 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
556 &ipv6h->saddr,
557 ipv6_get_dsfield(ipv6h));
558 if (err > 1) {
559 ++tunnel->dev->stats.rx_frame_errors;
560 ++tunnel->dev->stats.rx_errors;
561 goto drop;
562 }
563 }
564
565 tstats = this_cpu_ptr(tunnel->dev->tstats);
566 u64_stats_update_begin(&tstats->syncp);
567 tstats->rx_packets++;
568 tstats->rx_bytes += skb->len;
569 u64_stats_update_end(&tstats->syncp);
570
571 netif_rx(skb);
572
573 return 0;
574 }
575 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
576
577 drop:
578 kfree_skb(skb);
579 return 0;
580 }
581
582 struct ipv6_tel_txoption {
583 struct ipv6_txoptions ops;
584 __u8 dst_opt[8];
585 };
586
587 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
588 {
589 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
590
591 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
592 opt->dst_opt[3] = 1;
593 opt->dst_opt[4] = encap_limit;
594 opt->dst_opt[5] = IPV6_TLV_PADN;
595 opt->dst_opt[6] = 1;
596
597 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
598 opt->ops.opt_nflen = 8;
599 }
600
601 static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
602 struct net_device *dev,
603 __u8 dsfield,
604 struct flowi6 *fl6,
605 int encap_limit,
606 __u32 *pmtu)
607 {
608 struct ip6_tnl *tunnel = netdev_priv(dev);
609 struct net *net = tunnel->net;
610 struct net_device *tdev; /* Device to other host */
611 struct ipv6hdr *ipv6h; /* Our new IP header */
612 unsigned int max_headroom = 0; /* The extra header space needed */
613 int gre_hlen;
614 struct ipv6_tel_txoption opt;
615 int mtu;
616 struct dst_entry *dst = NULL, *ndst = NULL;
617 struct net_device_stats *stats = &tunnel->dev->stats;
618 int err = -1;
619 u8 proto;
620 struct sk_buff *new_skb;
621
622 if (dev->type == ARPHRD_ETHER)
623 IPCB(skb)->flags = 0;
624
625 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) {
626 gre_hlen = 0;
627 ipv6h = (struct ipv6hdr *)skb->data;
628 fl6->daddr = ipv6h->daddr;
629 } else {
630 gre_hlen = tunnel->hlen;
631 fl6->daddr = tunnel->parms.raddr;
632 }
633
634 if (!fl6->flowi6_mark)
635 dst = ip6_tnl_dst_check(tunnel);
636
637 if (!dst) {
638 ndst = ip6_route_output(net, NULL, fl6);
639
640 if (ndst->error)
641 goto tx_err_link_failure;
642 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
643 if (IS_ERR(ndst)) {
644 err = PTR_ERR(ndst);
645 ndst = NULL;
646 goto tx_err_link_failure;
647 }
648 dst = ndst;
649 }
650
651 tdev = dst->dev;
652
653 if (tdev == dev) {
654 stats->collisions++;
655 net_warn_ratelimited("%s: Local routing loop detected!\n",
656 tunnel->parms.name);
657 goto tx_err_dst_release;
658 }
659
660 mtu = dst_mtu(dst) - sizeof(*ipv6h);
661 if (encap_limit >= 0) {
662 max_headroom += 8;
663 mtu -= 8;
664 }
665 if (mtu < IPV6_MIN_MTU)
666 mtu = IPV6_MIN_MTU;
667 if (skb_dst(skb))
668 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
669 if (skb->len > mtu) {
670 *pmtu = mtu;
671 err = -EMSGSIZE;
672 goto tx_err_dst_release;
673 }
674
675 if (tunnel->err_count > 0) {
676 if (time_before(jiffies,
677 tunnel->err_time + IP6TUNNEL_ERR_TIMEO)) {
678 tunnel->err_count--;
679
680 dst_link_failure(skb);
681 } else
682 tunnel->err_count = 0;
683 }
684
685 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
686
687 max_headroom += LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len;
688
689 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
690 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
691 new_skb = skb_realloc_headroom(skb, max_headroom);
692 if (max_headroom > dev->needed_headroom)
693 dev->needed_headroom = max_headroom;
694 if (!new_skb)
695 goto tx_err_dst_release;
696
697 if (skb->sk)
698 skb_set_owner_w(new_skb, skb->sk);
699 consume_skb(skb);
700 skb = new_skb;
701 }
702
703 if (fl6->flowi6_mark) {
704 skb_dst_set(skb, dst);
705 ndst = NULL;
706 } else {
707 skb_dst_set_noref(skb, dst);
708 }
709
710 proto = NEXTHDR_GRE;
711 if (encap_limit >= 0) {
712 init_tel_txopt(&opt, encap_limit);
713 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
714 }
715
716 if (likely(!skb->encapsulation)) {
717 skb_reset_inner_headers(skb);
718 skb->encapsulation = 1;
719 }
720
721 skb_push(skb, gre_hlen);
722 skb_reset_network_header(skb);
723 skb_set_transport_header(skb, sizeof(*ipv6h));
724
725 /*
726 * Push down and install the IP header.
727 */
728 ipv6h = ipv6_hdr(skb);
729 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield),
730 ip6_make_flowlabel(net, skb, fl6->flowlabel, false));
731 ipv6h->hop_limit = tunnel->parms.hop_limit;
732 ipv6h->nexthdr = proto;
733 ipv6h->saddr = fl6->saddr;
734 ipv6h->daddr = fl6->daddr;
735
736 ((__be16 *)(ipv6h + 1))[0] = tunnel->parms.o_flags;
737 ((__be16 *)(ipv6h + 1))[1] = (dev->type == ARPHRD_ETHER) ?
738 htons(ETH_P_TEB) : skb->protocol;
739
740 if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) {
741 __be32 *ptr = (__be32 *)(((u8 *)ipv6h) + tunnel->hlen - 4);
742
743 if (tunnel->parms.o_flags&GRE_SEQ) {
744 ++tunnel->o_seqno;
745 *ptr = htonl(tunnel->o_seqno);
746 ptr--;
747 }
748 if (tunnel->parms.o_flags&GRE_KEY) {
749 *ptr = tunnel->parms.o_key;
750 ptr--;
751 }
752 if (tunnel->parms.o_flags&GRE_CSUM) {
753 *ptr = 0;
754 *(__sum16 *)ptr = ip_compute_csum((void *)(ipv6h+1),
755 skb->len - sizeof(struct ipv6hdr));
756 }
757 }
758
759 ip6tunnel_xmit(skb, dev);
760 if (ndst)
761 ip6_tnl_dst_store(tunnel, ndst);
762 return 0;
763 tx_err_link_failure:
764 stats->tx_carrier_errors++;
765 dst_link_failure(skb);
766 tx_err_dst_release:
767 dst_release(ndst);
768 return err;
769 }
770
771 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
772 {
773 struct ip6_tnl *t = netdev_priv(dev);
774 const struct iphdr *iph = ip_hdr(skb);
775 int encap_limit = -1;
776 struct flowi6 fl6;
777 __u8 dsfield;
778 __u32 mtu;
779 int err;
780
781 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
782 encap_limit = t->parms.encap_limit;
783
784 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
785 fl6.flowi6_proto = IPPROTO_IPIP;
786
787 dsfield = ipv4_get_dsfield(iph);
788
789 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
790 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
791 & IPV6_TCLASS_MASK;
792 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
793 fl6.flowi6_mark = skb->mark;
794
795 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
796 if (err != 0) {
797 /* XXX: send ICMP error even if DF is not set. */
798 if (err == -EMSGSIZE)
799 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
800 htonl(mtu));
801 return -1;
802 }
803
804 return 0;
805 }
806
807 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
808 {
809 struct ip6_tnl *t = netdev_priv(dev);
810 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
811 int encap_limit = -1;
812 __u16 offset;
813 struct flowi6 fl6;
814 __u8 dsfield;
815 __u32 mtu;
816 int err;
817
818 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
819 return -1;
820
821 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
822 if (offset > 0) {
823 struct ipv6_tlv_tnl_enc_lim *tel;
824 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
825 if (tel->encap_limit == 0) {
826 icmpv6_send(skb, ICMPV6_PARAMPROB,
827 ICMPV6_HDR_FIELD, offset + 2);
828 return -1;
829 }
830 encap_limit = tel->encap_limit - 1;
831 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
832 encap_limit = t->parms.encap_limit;
833
834 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
835 fl6.flowi6_proto = IPPROTO_IPV6;
836
837 dsfield = ipv6_get_dsfield(ipv6h);
838 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
839 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
840 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
841 fl6.flowlabel |= ip6_flowlabel(ipv6h);
842 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
843 fl6.flowi6_mark = skb->mark;
844
845 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
846 if (err != 0) {
847 if (err == -EMSGSIZE)
848 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
849 return -1;
850 }
851
852 return 0;
853 }
854
855 /**
856 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
857 * @t: the outgoing tunnel device
858 * @hdr: IPv6 header from the incoming packet
859 *
860 * Description:
861 * Avoid trivial tunneling loop by checking that tunnel exit-point
862 * doesn't match source of incoming packet.
863 *
864 * Return:
865 * 1 if conflict,
866 * 0 else
867 **/
868
869 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
870 const struct ipv6hdr *hdr)
871 {
872 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
873 }
874
875 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
876 {
877 struct ip6_tnl *t = netdev_priv(dev);
878 int encap_limit = -1;
879 struct flowi6 fl6;
880 __u32 mtu;
881 int err;
882
883 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
884 encap_limit = t->parms.encap_limit;
885
886 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
887 fl6.flowi6_proto = skb->protocol;
888
889 err = ip6gre_xmit2(skb, dev, 0, &fl6, encap_limit, &mtu);
890
891 return err;
892 }
893
894 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
895 struct net_device *dev)
896 {
897 struct ip6_tnl *t = netdev_priv(dev);
898 struct net_device_stats *stats = &t->dev->stats;
899 int ret;
900
901 if (!ip6_tnl_xmit_ctl(t))
902 goto tx_err;
903
904 switch (skb->protocol) {
905 case htons(ETH_P_IP):
906 ret = ip6gre_xmit_ipv4(skb, dev);
907 break;
908 case htons(ETH_P_IPV6):
909 ret = ip6gre_xmit_ipv6(skb, dev);
910 break;
911 default:
912 ret = ip6gre_xmit_other(skb, dev);
913 break;
914 }
915
916 if (ret < 0)
917 goto tx_err;
918
919 return NETDEV_TX_OK;
920
921 tx_err:
922 stats->tx_errors++;
923 stats->tx_dropped++;
924 kfree_skb(skb);
925 return NETDEV_TX_OK;
926 }
927
928 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
929 {
930 struct net_device *dev = t->dev;
931 struct __ip6_tnl_parm *p = &t->parms;
932 struct flowi6 *fl6 = &t->fl.u.ip6;
933 int addend = sizeof(struct ipv6hdr) + 4;
934
935 if (dev->type != ARPHRD_ETHER) {
936 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
937 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
938 }
939
940 /* Set up flowi template */
941 fl6->saddr = p->laddr;
942 fl6->daddr = p->raddr;
943 fl6->flowi6_oif = p->link;
944 fl6->flowlabel = 0;
945
946 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
947 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
948 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
949 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
950
951 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
952 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
953
954 if (p->flags&IP6_TNL_F_CAP_XMIT &&
955 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
956 dev->flags |= IFF_POINTOPOINT;
957 else
958 dev->flags &= ~IFF_POINTOPOINT;
959
960 dev->iflink = p->link;
961
962 /* Precalculate GRE options length */
963 if (t->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) {
964 if (t->parms.o_flags&GRE_CSUM)
965 addend += 4;
966 if (t->parms.o_flags&GRE_KEY)
967 addend += 4;
968 if (t->parms.o_flags&GRE_SEQ)
969 addend += 4;
970 }
971 t->hlen = addend;
972
973 if (p->flags & IP6_TNL_F_CAP_XMIT) {
974 int strict = (ipv6_addr_type(&p->raddr) &
975 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
976
977 struct rt6_info *rt = rt6_lookup(t->net,
978 &p->raddr, &p->laddr,
979 p->link, strict);
980
981 if (rt == NULL)
982 return;
983
984 if (rt->dst.dev) {
985 dev->hard_header_len = rt->dst.dev->hard_header_len + addend;
986
987 if (set_mtu) {
988 dev->mtu = rt->dst.dev->mtu - addend;
989 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
990 dev->mtu -= 8;
991
992 if (dev->mtu < IPV6_MIN_MTU)
993 dev->mtu = IPV6_MIN_MTU;
994 }
995 }
996 ip6_rt_put(rt);
997 }
998 }
999
1000 static int ip6gre_tnl_change(struct ip6_tnl *t,
1001 const struct __ip6_tnl_parm *p, int set_mtu)
1002 {
1003 t->parms.laddr = p->laddr;
1004 t->parms.raddr = p->raddr;
1005 t->parms.flags = p->flags;
1006 t->parms.hop_limit = p->hop_limit;
1007 t->parms.encap_limit = p->encap_limit;
1008 t->parms.flowinfo = p->flowinfo;
1009 t->parms.link = p->link;
1010 t->parms.proto = p->proto;
1011 t->parms.i_key = p->i_key;
1012 t->parms.o_key = p->o_key;
1013 t->parms.i_flags = p->i_flags;
1014 t->parms.o_flags = p->o_flags;
1015 ip6_tnl_dst_reset(t);
1016 ip6gre_tnl_link_config(t, set_mtu);
1017 return 0;
1018 }
1019
1020 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1021 const struct ip6_tnl_parm2 *u)
1022 {
1023 p->laddr = u->laddr;
1024 p->raddr = u->raddr;
1025 p->flags = u->flags;
1026 p->hop_limit = u->hop_limit;
1027 p->encap_limit = u->encap_limit;
1028 p->flowinfo = u->flowinfo;
1029 p->link = u->link;
1030 p->i_key = u->i_key;
1031 p->o_key = u->o_key;
1032 p->i_flags = u->i_flags;
1033 p->o_flags = u->o_flags;
1034 memcpy(p->name, u->name, sizeof(u->name));
1035 }
1036
1037 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1038 const struct __ip6_tnl_parm *p)
1039 {
1040 u->proto = IPPROTO_GRE;
1041 u->laddr = p->laddr;
1042 u->raddr = p->raddr;
1043 u->flags = p->flags;
1044 u->hop_limit = p->hop_limit;
1045 u->encap_limit = p->encap_limit;
1046 u->flowinfo = p->flowinfo;
1047 u->link = p->link;
1048 u->i_key = p->i_key;
1049 u->o_key = p->o_key;
1050 u->i_flags = p->i_flags;
1051 u->o_flags = p->o_flags;
1052 memcpy(u->name, p->name, sizeof(u->name));
1053 }
1054
1055 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1056 struct ifreq *ifr, int cmd)
1057 {
1058 int err = 0;
1059 struct ip6_tnl_parm2 p;
1060 struct __ip6_tnl_parm p1;
1061 struct ip6_tnl *t = netdev_priv(dev);
1062 struct net *net = t->net;
1063 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1064
1065 switch (cmd) {
1066 case SIOCGETTUNNEL:
1067 if (dev == ign->fb_tunnel_dev) {
1068 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1069 err = -EFAULT;
1070 break;
1071 }
1072 ip6gre_tnl_parm_from_user(&p1, &p);
1073 t = ip6gre_tunnel_locate(net, &p1, 0);
1074 if (t == NULL)
1075 t = netdev_priv(dev);
1076 }
1077 memset(&p, 0, sizeof(p));
1078 ip6gre_tnl_parm_to_user(&p, &t->parms);
1079 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1080 err = -EFAULT;
1081 break;
1082
1083 case SIOCADDTUNNEL:
1084 case SIOCCHGTUNNEL:
1085 err = -EPERM;
1086 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1087 goto done;
1088
1089 err = -EFAULT;
1090 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1091 goto done;
1092
1093 err = -EINVAL;
1094 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1095 goto done;
1096
1097 if (!(p.i_flags&GRE_KEY))
1098 p.i_key = 0;
1099 if (!(p.o_flags&GRE_KEY))
1100 p.o_key = 0;
1101
1102 ip6gre_tnl_parm_from_user(&p1, &p);
1103 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1104
1105 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1106 if (t != NULL) {
1107 if (t->dev != dev) {
1108 err = -EEXIST;
1109 break;
1110 }
1111 } else {
1112 t = netdev_priv(dev);
1113
1114 ip6gre_tunnel_unlink(ign, t);
1115 synchronize_net();
1116 ip6gre_tnl_change(t, &p1, 1);
1117 ip6gre_tunnel_link(ign, t);
1118 netdev_state_change(dev);
1119 }
1120 }
1121
1122 if (t) {
1123 err = 0;
1124
1125 memset(&p, 0, sizeof(p));
1126 ip6gre_tnl_parm_to_user(&p, &t->parms);
1127 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1128 err = -EFAULT;
1129 } else
1130 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1131 break;
1132
1133 case SIOCDELTUNNEL:
1134 err = -EPERM;
1135 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1136 goto done;
1137
1138 if (dev == ign->fb_tunnel_dev) {
1139 err = -EFAULT;
1140 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1141 goto done;
1142 err = -ENOENT;
1143 ip6gre_tnl_parm_from_user(&p1, &p);
1144 t = ip6gre_tunnel_locate(net, &p1, 0);
1145 if (t == NULL)
1146 goto done;
1147 err = -EPERM;
1148 if (t == netdev_priv(ign->fb_tunnel_dev))
1149 goto done;
1150 dev = t->dev;
1151 }
1152 unregister_netdevice(dev);
1153 err = 0;
1154 break;
1155
1156 default:
1157 err = -EINVAL;
1158 }
1159
1160 done:
1161 return err;
1162 }
1163
1164 static int ip6gre_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1165 {
1166 if (new_mtu < 68 ||
1167 new_mtu > 0xFFF8 - dev->hard_header_len)
1168 return -EINVAL;
1169 dev->mtu = new_mtu;
1170 return 0;
1171 }
1172
1173 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1174 unsigned short type,
1175 const void *daddr, const void *saddr, unsigned int len)
1176 {
1177 struct ip6_tnl *t = netdev_priv(dev);
1178 struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen);
1179 __be16 *p = (__be16 *)(ipv6h+1);
1180
1181 ip6_flow_hdr(ipv6h, 0,
1182 ip6_make_flowlabel(dev_net(dev), skb,
1183 t->fl.u.ip6.flowlabel, false));
1184 ipv6h->hop_limit = t->parms.hop_limit;
1185 ipv6h->nexthdr = NEXTHDR_GRE;
1186 ipv6h->saddr = t->parms.laddr;
1187 ipv6h->daddr = t->parms.raddr;
1188
1189 p[0] = t->parms.o_flags;
1190 p[1] = htons(type);
1191
1192 /*
1193 * Set the source hardware address.
1194 */
1195
1196 if (saddr)
1197 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1198 if (daddr)
1199 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1200 if (!ipv6_addr_any(&ipv6h->daddr))
1201 return t->hlen;
1202
1203 return -t->hlen;
1204 }
1205
1206 static const struct header_ops ip6gre_header_ops = {
1207 .create = ip6gre_header,
1208 };
1209
1210 static const struct net_device_ops ip6gre_netdev_ops = {
1211 .ndo_init = ip6gre_tunnel_init,
1212 .ndo_uninit = ip6gre_tunnel_uninit,
1213 .ndo_start_xmit = ip6gre_tunnel_xmit,
1214 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1215 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1216 .ndo_get_stats64 = ip_tunnel_get_stats64,
1217 };
1218
1219 static void ip6gre_dev_free(struct net_device *dev)
1220 {
1221 free_percpu(dev->tstats);
1222 free_netdev(dev);
1223 }
1224
1225 static void ip6gre_tunnel_setup(struct net_device *dev)
1226 {
1227 struct ip6_tnl *t;
1228
1229 dev->netdev_ops = &ip6gre_netdev_ops;
1230 dev->destructor = ip6gre_dev_free;
1231
1232 dev->type = ARPHRD_IP6GRE;
1233 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr) + 4;
1234 dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr) - 4;
1235 t = netdev_priv(dev);
1236 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1237 dev->mtu -= 8;
1238 dev->flags |= IFF_NOARP;
1239 dev->iflink = 0;
1240 dev->addr_len = sizeof(struct in6_addr);
1241 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1242 }
1243
1244 static int ip6gre_tunnel_init(struct net_device *dev)
1245 {
1246 struct ip6_tnl *tunnel;
1247 int i;
1248
1249 tunnel = netdev_priv(dev);
1250
1251 tunnel->dev = dev;
1252 tunnel->net = dev_net(dev);
1253 strcpy(tunnel->parms.name, dev->name);
1254
1255 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1256 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1257
1258 if (ipv6_addr_any(&tunnel->parms.raddr))
1259 dev->header_ops = &ip6gre_header_ops;
1260
1261 dev->tstats = alloc_percpu(struct pcpu_sw_netstats);
1262 if (!dev->tstats)
1263 return -ENOMEM;
1264
1265 for_each_possible_cpu(i) {
1266 struct pcpu_sw_netstats *ip6gre_tunnel_stats;
1267 ip6gre_tunnel_stats = per_cpu_ptr(dev->tstats, i);
1268 u64_stats_init(&ip6gre_tunnel_stats->syncp);
1269 }
1270
1271
1272 return 0;
1273 }
1274
1275 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1276 {
1277 struct ip6_tnl *tunnel = netdev_priv(dev);
1278
1279 tunnel->dev = dev;
1280 tunnel->net = dev_net(dev);
1281 strcpy(tunnel->parms.name, dev->name);
1282
1283 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1284
1285 dev_hold(dev);
1286 }
1287
1288
1289 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1290 .handler = ip6gre_rcv,
1291 .err_handler = ip6gre_err,
1292 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1293 };
1294
1295 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1296 {
1297 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1298 struct net_device *dev, *aux;
1299 int prio;
1300
1301 for_each_netdev_safe(net, dev, aux)
1302 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1303 dev->rtnl_link_ops == &ip6gre_tap_ops)
1304 unregister_netdevice_queue(dev, head);
1305
1306 for (prio = 0; prio < 4; prio++) {
1307 int h;
1308 for (h = 0; h < HASH_SIZE; h++) {
1309 struct ip6_tnl *t;
1310
1311 t = rtnl_dereference(ign->tunnels[prio][h]);
1312
1313 while (t != NULL) {
1314 /* If dev is in the same netns, it has already
1315 * been added to the list by the previous loop.
1316 */
1317 if (!net_eq(dev_net(t->dev), net))
1318 unregister_netdevice_queue(t->dev,
1319 head);
1320 t = rtnl_dereference(t->next);
1321 }
1322 }
1323 }
1324 }
1325
1326 static int __net_init ip6gre_init_net(struct net *net)
1327 {
1328 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1329 int err;
1330
1331 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1332 NET_NAME_UNKNOWN,
1333 ip6gre_tunnel_setup);
1334 if (!ign->fb_tunnel_dev) {
1335 err = -ENOMEM;
1336 goto err_alloc_dev;
1337 }
1338 dev_net_set(ign->fb_tunnel_dev, net);
1339 /* FB netdevice is special: we have one, and only one per netns.
1340 * Allowing to move it to another netns is clearly unsafe.
1341 */
1342 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1343
1344
1345 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1346 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1347
1348 err = register_netdev(ign->fb_tunnel_dev);
1349 if (err)
1350 goto err_reg_dev;
1351
1352 rcu_assign_pointer(ign->tunnels_wc[0],
1353 netdev_priv(ign->fb_tunnel_dev));
1354 return 0;
1355
1356 err_reg_dev:
1357 ip6gre_dev_free(ign->fb_tunnel_dev);
1358 err_alloc_dev:
1359 return err;
1360 }
1361
1362 static void __net_exit ip6gre_exit_net(struct net *net)
1363 {
1364 LIST_HEAD(list);
1365
1366 rtnl_lock();
1367 ip6gre_destroy_tunnels(net, &list);
1368 unregister_netdevice_many(&list);
1369 rtnl_unlock();
1370 }
1371
1372 static struct pernet_operations ip6gre_net_ops = {
1373 .init = ip6gre_init_net,
1374 .exit = ip6gre_exit_net,
1375 .id = &ip6gre_net_id,
1376 .size = sizeof(struct ip6gre_net),
1377 };
1378
1379 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
1380 {
1381 __be16 flags;
1382
1383 if (!data)
1384 return 0;
1385
1386 flags = 0;
1387 if (data[IFLA_GRE_IFLAGS])
1388 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1389 if (data[IFLA_GRE_OFLAGS])
1390 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1391 if (flags & (GRE_VERSION|GRE_ROUTING))
1392 return -EINVAL;
1393
1394 return 0;
1395 }
1396
1397 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
1398 {
1399 struct in6_addr daddr;
1400
1401 if (tb[IFLA_ADDRESS]) {
1402 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1403 return -EINVAL;
1404 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1405 return -EADDRNOTAVAIL;
1406 }
1407
1408 if (!data)
1409 goto out;
1410
1411 if (data[IFLA_GRE_REMOTE]) {
1412 nla_memcpy(&daddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1413 if (ipv6_addr_any(&daddr))
1414 return -EINVAL;
1415 }
1416
1417 out:
1418 return ip6gre_tunnel_validate(tb, data);
1419 }
1420
1421
1422 static void ip6gre_netlink_parms(struct nlattr *data[],
1423 struct __ip6_tnl_parm *parms)
1424 {
1425 memset(parms, 0, sizeof(*parms));
1426
1427 if (!data)
1428 return;
1429
1430 if (data[IFLA_GRE_LINK])
1431 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1432
1433 if (data[IFLA_GRE_IFLAGS])
1434 parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]);
1435
1436 if (data[IFLA_GRE_OFLAGS])
1437 parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]);
1438
1439 if (data[IFLA_GRE_IKEY])
1440 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1441
1442 if (data[IFLA_GRE_OKEY])
1443 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1444
1445 if (data[IFLA_GRE_LOCAL])
1446 nla_memcpy(&parms->laddr, data[IFLA_GRE_LOCAL], sizeof(struct in6_addr));
1447
1448 if (data[IFLA_GRE_REMOTE])
1449 nla_memcpy(&parms->raddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1450
1451 if (data[IFLA_GRE_TTL])
1452 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1453
1454 if (data[IFLA_GRE_ENCAP_LIMIT])
1455 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1456
1457 if (data[IFLA_GRE_FLOWINFO])
1458 parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]);
1459
1460 if (data[IFLA_GRE_FLAGS])
1461 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1462 }
1463
1464 static int ip6gre_tap_init(struct net_device *dev)
1465 {
1466 struct ip6_tnl *tunnel;
1467
1468 tunnel = netdev_priv(dev);
1469
1470 tunnel->dev = dev;
1471 tunnel->net = dev_net(dev);
1472 strcpy(tunnel->parms.name, dev->name);
1473
1474 ip6gre_tnl_link_config(tunnel, 1);
1475
1476 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1477 if (!dev->tstats)
1478 return -ENOMEM;
1479
1480 return 0;
1481 }
1482
1483 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1484 .ndo_init = ip6gre_tap_init,
1485 .ndo_uninit = ip6gre_tunnel_uninit,
1486 .ndo_start_xmit = ip6gre_tunnel_xmit,
1487 .ndo_set_mac_address = eth_mac_addr,
1488 .ndo_validate_addr = eth_validate_addr,
1489 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1490 .ndo_get_stats64 = ip_tunnel_get_stats64,
1491 };
1492
1493 static void ip6gre_tap_setup(struct net_device *dev)
1494 {
1495
1496 ether_setup(dev);
1497
1498 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1499 dev->destructor = ip6gre_dev_free;
1500
1501 dev->iflink = 0;
1502 dev->features |= NETIF_F_NETNS_LOCAL;
1503 }
1504
1505 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1506 struct nlattr *tb[], struct nlattr *data[])
1507 {
1508 struct ip6_tnl *nt;
1509 struct net *net = dev_net(dev);
1510 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1511 int err;
1512
1513 nt = netdev_priv(dev);
1514 ip6gre_netlink_parms(data, &nt->parms);
1515
1516 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1517 return -EEXIST;
1518
1519 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1520 eth_hw_addr_random(dev);
1521
1522 nt->dev = dev;
1523 nt->net = dev_net(dev);
1524 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1525
1526 /* Can use a lockless transmit, unless we generate output sequences */
1527 if (!(nt->parms.o_flags & GRE_SEQ))
1528 dev->features |= NETIF_F_LLTX;
1529
1530 err = register_netdevice(dev);
1531 if (err)
1532 goto out;
1533
1534 dev_hold(dev);
1535 ip6gre_tunnel_link(ign, nt);
1536
1537 out:
1538 return err;
1539 }
1540
1541 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1542 struct nlattr *data[])
1543 {
1544 struct ip6_tnl *t, *nt = netdev_priv(dev);
1545 struct net *net = nt->net;
1546 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1547 struct __ip6_tnl_parm p;
1548
1549 if (dev == ign->fb_tunnel_dev)
1550 return -EINVAL;
1551
1552 ip6gre_netlink_parms(data, &p);
1553
1554 t = ip6gre_tunnel_locate(net, &p, 0);
1555
1556 if (t) {
1557 if (t->dev != dev)
1558 return -EEXIST;
1559 } else {
1560 t = nt;
1561
1562 ip6gre_tunnel_unlink(ign, t);
1563 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1564 ip6gre_tunnel_link(ign, t);
1565 netdev_state_change(dev);
1566 }
1567
1568 return 0;
1569 }
1570
1571 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
1572 {
1573 struct net *net = dev_net(dev);
1574 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1575
1576 if (dev != ign->fb_tunnel_dev)
1577 unregister_netdevice_queue(dev, head);
1578 }
1579
1580 static size_t ip6gre_get_size(const struct net_device *dev)
1581 {
1582 return
1583 /* IFLA_GRE_LINK */
1584 nla_total_size(4) +
1585 /* IFLA_GRE_IFLAGS */
1586 nla_total_size(2) +
1587 /* IFLA_GRE_OFLAGS */
1588 nla_total_size(2) +
1589 /* IFLA_GRE_IKEY */
1590 nla_total_size(4) +
1591 /* IFLA_GRE_OKEY */
1592 nla_total_size(4) +
1593 /* IFLA_GRE_LOCAL */
1594 nla_total_size(sizeof(struct in6_addr)) +
1595 /* IFLA_GRE_REMOTE */
1596 nla_total_size(sizeof(struct in6_addr)) +
1597 /* IFLA_GRE_TTL */
1598 nla_total_size(1) +
1599 /* IFLA_GRE_TOS */
1600 nla_total_size(1) +
1601 /* IFLA_GRE_ENCAP_LIMIT */
1602 nla_total_size(1) +
1603 /* IFLA_GRE_FLOWINFO */
1604 nla_total_size(4) +
1605 /* IFLA_GRE_FLAGS */
1606 nla_total_size(4) +
1607 0;
1608 }
1609
1610 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1611 {
1612 struct ip6_tnl *t = netdev_priv(dev);
1613 struct __ip6_tnl_parm *p = &t->parms;
1614
1615 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1616 nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) ||
1617 nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) ||
1618 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1619 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
1620 nla_put(skb, IFLA_GRE_LOCAL, sizeof(struct in6_addr), &p->laddr) ||
1621 nla_put(skb, IFLA_GRE_REMOTE, sizeof(struct in6_addr), &p->raddr) ||
1622 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1623 /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/
1624 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1625 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1626 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags))
1627 goto nla_put_failure;
1628 return 0;
1629
1630 nla_put_failure:
1631 return -EMSGSIZE;
1632 }
1633
1634 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1635 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1636 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1637 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1638 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1639 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1640 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1641 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1642 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1643 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1644 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1645 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1646 };
1647
1648 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1649 .kind = "ip6gre",
1650 .maxtype = IFLA_GRE_MAX,
1651 .policy = ip6gre_policy,
1652 .priv_size = sizeof(struct ip6_tnl),
1653 .setup = ip6gre_tunnel_setup,
1654 .validate = ip6gre_tunnel_validate,
1655 .newlink = ip6gre_newlink,
1656 .changelink = ip6gre_changelink,
1657 .dellink = ip6gre_dellink,
1658 .get_size = ip6gre_get_size,
1659 .fill_info = ip6gre_fill_info,
1660 };
1661
1662 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1663 .kind = "ip6gretap",
1664 .maxtype = IFLA_GRE_MAX,
1665 .policy = ip6gre_policy,
1666 .priv_size = sizeof(struct ip6_tnl),
1667 .setup = ip6gre_tap_setup,
1668 .validate = ip6gre_tap_validate,
1669 .newlink = ip6gre_newlink,
1670 .changelink = ip6gre_changelink,
1671 .get_size = ip6gre_get_size,
1672 .fill_info = ip6gre_fill_info,
1673 };
1674
1675 /*
1676 * And now the modules code and kernel interface.
1677 */
1678
1679 static int __init ip6gre_init(void)
1680 {
1681 int err;
1682
1683 pr_info("GRE over IPv6 tunneling driver\n");
1684
1685 err = register_pernet_device(&ip6gre_net_ops);
1686 if (err < 0)
1687 return err;
1688
1689 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1690 if (err < 0) {
1691 pr_info("%s: can't add protocol\n", __func__);
1692 goto add_proto_failed;
1693 }
1694
1695 err = rtnl_link_register(&ip6gre_link_ops);
1696 if (err < 0)
1697 goto rtnl_link_failed;
1698
1699 err = rtnl_link_register(&ip6gre_tap_ops);
1700 if (err < 0)
1701 goto tap_ops_failed;
1702
1703 out:
1704 return err;
1705
1706 tap_ops_failed:
1707 rtnl_link_unregister(&ip6gre_link_ops);
1708 rtnl_link_failed:
1709 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1710 add_proto_failed:
1711 unregister_pernet_device(&ip6gre_net_ops);
1712 goto out;
1713 }
1714
1715 static void __exit ip6gre_fini(void)
1716 {
1717 rtnl_link_unregister(&ip6gre_tap_ops);
1718 rtnl_link_unregister(&ip6gre_link_ops);
1719 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1720 unregister_pernet_device(&ip6gre_net_ops);
1721 }
1722
1723 module_init(ip6gre_init);
1724 module_exit(ip6gre_fini);
1725 MODULE_LICENSE("GPL");
1726 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1727 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1728 MODULE_ALIAS_RTNL_LINK("ip6gre");
1729 MODULE_ALIAS_RTNL_LINK("ip6gretap");
1730 MODULE_ALIAS_NETDEV("ip6gre0");
Linux kernel - Deliverables
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