projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge tag 'hwspinlock-3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/ohad...
[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, NET_NAME_UNKNOWN,
326 ip6gre_tunnel_setup);
327 if (!dev)
328 return NULL;
329
330 dev_net_set(dev, net);
331
332 nt = netdev_priv(dev);
333 nt->parms = *parms;
334 dev->rtnl_link_ops = &ip6gre_link_ops;
335
336 nt->dev = dev;
337 nt->net = dev_net(dev);
338 ip6gre_tnl_link_config(nt, 1);
339
340 if (register_netdevice(dev) < 0)
341 goto failed_free;
342
343 /* Can use a lockless transmit, unless we generate output sequences */
344 if (!(nt->parms.o_flags & GRE_SEQ))
345 dev->features |= NETIF_F_LLTX;
346
347 dev_hold(dev);
348 ip6gre_tunnel_link(ign, nt);
349 return nt;
350
351 failed_free:
352 free_netdev(dev);
353 return NULL;
354 }
355
356 static void ip6gre_tunnel_uninit(struct net_device *dev)
357 {
358 struct ip6_tnl *t = netdev_priv(dev);
359 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
360
361 ip6gre_tunnel_unlink(ign, t);
362 dev_put(dev);
363 }
364
365
366 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
367 u8 type, u8 code, int offset, __be32 info)
368 {
369 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
370 __be16 *p = (__be16 *)(skb->data + offset);
371 int grehlen = offset + 4;
372 struct ip6_tnl *t;
373 __be16 flags;
374
375 flags = p[0];
376 if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) {
377 if (flags&(GRE_VERSION|GRE_ROUTING))
378 return;
379 if (flags&GRE_KEY) {
380 grehlen += 4;
381 if (flags&GRE_CSUM)
382 grehlen += 4;
383 }
384 }
385
386 /* If only 8 bytes returned, keyed message will be dropped here */
387 if (!pskb_may_pull(skb, grehlen))
388 return;
389 ipv6h = (const struct ipv6hdr *)skb->data;
390 p = (__be16 *)(skb->data + offset);
391
392 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
393 flags & GRE_KEY ?
394 *(((__be32 *)p) + (grehlen / 4) - 1) : 0,
395 p[1]);
396 if (t == NULL)
397 return;
398
399 switch (type) {
400 __u32 teli;
401 struct ipv6_tlv_tnl_enc_lim *tel;
402 __u32 mtu;
403 case ICMPV6_DEST_UNREACH:
404 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
405 t->parms.name);
406 break;
407 case ICMPV6_TIME_EXCEED:
408 if (code == ICMPV6_EXC_HOPLIMIT) {
409 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
410 t->parms.name);
411 }
412 break;
413 case ICMPV6_PARAMPROB:
414 teli = 0;
415 if (code == ICMPV6_HDR_FIELD)
416 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
417
418 if (teli && teli == info - 2) {
419 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
420 if (tel->encap_limit == 0) {
421 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
422 t->parms.name);
423 }
424 } else {
425 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
426 t->parms.name);
427 }
428 break;
429 case ICMPV6_PKT_TOOBIG:
430 mtu = info - offset;
431 if (mtu < IPV6_MIN_MTU)
432 mtu = IPV6_MIN_MTU;
433 t->dev->mtu = mtu;
434 break;
435 }
436
437 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
438 t->err_count++;
439 else
440 t->err_count = 1;
441 t->err_time = jiffies;
442 }
443
444 static int ip6gre_rcv(struct sk_buff *skb)
445 {
446 const struct ipv6hdr *ipv6h;
447 u8 *h;
448 __be16 flags;
449 __sum16 csum = 0;
450 __be32 key = 0;
451 u32 seqno = 0;
452 struct ip6_tnl *tunnel;
453 int offset = 4;
454 __be16 gre_proto;
455 int err;
456
457 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
458 goto drop;
459
460 ipv6h = ipv6_hdr(skb);
461 h = skb->data;
462 flags = *(__be16 *)h;
463
464 if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) {
465 /* - Version must be 0.
466 - We do not support routing headers.
467 */
468 if (flags&(GRE_VERSION|GRE_ROUTING))
469 goto drop;
470
471 if (flags&GRE_CSUM) {
472 csum = skb_checksum_simple_validate(skb);
473 offset += 4;
474 }
475 if (flags&GRE_KEY) {
476 key = *(__be32 *)(h + offset);
477 offset += 4;
478 }
479 if (flags&GRE_SEQ) {
480 seqno = ntohl(*(__be32 *)(h + offset));
481 offset += 4;
482 }
483 }
484
485 gre_proto = *(__be16 *)(h + 2);
486
487 tunnel = ip6gre_tunnel_lookup(skb->dev,
488 &ipv6h->saddr, &ipv6h->daddr, key,
489 gre_proto);
490 if (tunnel) {
491 struct pcpu_sw_netstats *tstats;
492
493 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
494 goto drop;
495
496 if (!ip6_tnl_rcv_ctl(tunnel, &ipv6h->daddr, &ipv6h->saddr)) {
497 tunnel->dev->stats.rx_dropped++;
498 goto drop;
499 }
500
501 skb->protocol = gre_proto;
502 /* WCCP version 1 and 2 protocol decoding.
503 * - Change protocol to IP
504 * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
505 */
506 if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) {
507 skb->protocol = htons(ETH_P_IP);
508 if ((*(h + offset) & 0xF0) != 0x40)
509 offset += 4;
510 }
511
512 skb->mac_header = skb->network_header;
513 __pskb_pull(skb, offset);
514 skb_postpull_rcsum(skb, skb_transport_header(skb), offset);
515
516 if (((flags&GRE_CSUM) && csum) ||
517 (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) {
518 tunnel->dev->stats.rx_crc_errors++;
519 tunnel->dev->stats.rx_errors++;
520 goto drop;
521 }
522 if (tunnel->parms.i_flags&GRE_SEQ) {
523 if (!(flags&GRE_SEQ) ||
524 (tunnel->i_seqno &&
525 (s32)(seqno - tunnel->i_seqno) < 0)) {
526 tunnel->dev->stats.rx_fifo_errors++;
527 tunnel->dev->stats.rx_errors++;
528 goto drop;
529 }
530 tunnel->i_seqno = seqno + 1;
531 }
532
533 /* Warning: All skb pointers will be invalidated! */
534 if (tunnel->dev->type == ARPHRD_ETHER) {
535 if (!pskb_may_pull(skb, ETH_HLEN)) {
536 tunnel->dev->stats.rx_length_errors++;
537 tunnel->dev->stats.rx_errors++;
538 goto drop;
539 }
540
541 ipv6h = ipv6_hdr(skb);
542 skb->protocol = eth_type_trans(skb, tunnel->dev);
543 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
544 }
545
546 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
547
548 skb_reset_network_header(skb);
549
550 err = IP6_ECN_decapsulate(ipv6h, skb);
551 if (unlikely(err)) {
552 if (log_ecn_error)
553 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
554 &ipv6h->saddr,
555 ipv6_get_dsfield(ipv6h));
556 if (err > 1) {
557 ++tunnel->dev->stats.rx_frame_errors;
558 ++tunnel->dev->stats.rx_errors;
559 goto drop;
560 }
561 }
562
563 tstats = this_cpu_ptr(tunnel->dev->tstats);
564 u64_stats_update_begin(&tstats->syncp);
565 tstats->rx_packets++;
566 tstats->rx_bytes += skb->len;
567 u64_stats_update_end(&tstats->syncp);
568
569 netif_rx(skb);
570
571 return 0;
572 }
573 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
574
575 drop:
576 kfree_skb(skb);
577 return 0;
578 }
579
580 struct ipv6_tel_txoption {
581 struct ipv6_txoptions ops;
582 __u8 dst_opt[8];
583 };
584
585 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
586 {
587 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
588
589 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
590 opt->dst_opt[3] = 1;
591 opt->dst_opt[4] = encap_limit;
592 opt->dst_opt[5] = IPV6_TLV_PADN;
593 opt->dst_opt[6] = 1;
594
595 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
596 opt->ops.opt_nflen = 8;
597 }
598
599 static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
600 struct net_device *dev,
601 __u8 dsfield,
602 struct flowi6 *fl6,
603 int encap_limit,
604 __u32 *pmtu)
605 {
606 struct ip6_tnl *tunnel = netdev_priv(dev);
607 struct net *net = tunnel->net;
608 struct net_device *tdev; /* Device to other host */
609 struct ipv6hdr *ipv6h; /* Our new IP header */
610 unsigned int max_headroom = 0; /* The extra header space needed */
611 int gre_hlen;
612 struct ipv6_tel_txoption opt;
613 int mtu;
614 struct dst_entry *dst = NULL, *ndst = NULL;
615 struct net_device_stats *stats = &tunnel->dev->stats;
616 int err = -1;
617 u8 proto;
618 struct sk_buff *new_skb;
619
620 if (dev->type == ARPHRD_ETHER)
621 IPCB(skb)->flags = 0;
622
623 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) {
624 gre_hlen = 0;
625 ipv6h = (struct ipv6hdr *)skb->data;
626 fl6->daddr = ipv6h->daddr;
627 } else {
628 gre_hlen = tunnel->hlen;
629 fl6->daddr = tunnel->parms.raddr;
630 }
631
632 if (!fl6->flowi6_mark)
633 dst = ip6_tnl_dst_check(tunnel);
634
635 if (!dst) {
636 ndst = ip6_route_output(net, NULL, fl6);
637
638 if (ndst->error)
639 goto tx_err_link_failure;
640 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
641 if (IS_ERR(ndst)) {
642 err = PTR_ERR(ndst);
643 ndst = NULL;
644 goto tx_err_link_failure;
645 }
646 dst = ndst;
647 }
648
649 tdev = dst->dev;
650
651 if (tdev == dev) {
652 stats->collisions++;
653 net_warn_ratelimited("%s: Local routing loop detected!\n",
654 tunnel->parms.name);
655 goto tx_err_dst_release;
656 }
657
658 mtu = dst_mtu(dst) - sizeof(*ipv6h);
659 if (encap_limit >= 0) {
660 max_headroom += 8;
661 mtu -= 8;
662 }
663 if (mtu < IPV6_MIN_MTU)
664 mtu = IPV6_MIN_MTU;
665 if (skb_dst(skb))
666 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
667 if (skb->len > mtu) {
668 *pmtu = mtu;
669 err = -EMSGSIZE;
670 goto tx_err_dst_release;
671 }
672
673 if (tunnel->err_count > 0) {
674 if (time_before(jiffies,
675 tunnel->err_time + IP6TUNNEL_ERR_TIMEO)) {
676 tunnel->err_count--;
677
678 dst_link_failure(skb);
679 } else
680 tunnel->err_count = 0;
681 }
682
683 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
684
685 max_headroom += LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len;
686
687 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
688 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
689 new_skb = skb_realloc_headroom(skb, max_headroom);
690 if (max_headroom > dev->needed_headroom)
691 dev->needed_headroom = max_headroom;
692 if (!new_skb)
693 goto tx_err_dst_release;
694
695 if (skb->sk)
696 skb_set_owner_w(new_skb, skb->sk);
697 consume_skb(skb);
698 skb = new_skb;
699 }
700
701 if (fl6->flowi6_mark) {
702 skb_dst_set(skb, dst);
703 ndst = NULL;
704 } else {
705 skb_dst_set_noref(skb, dst);
706 }
707
708 proto = NEXTHDR_GRE;
709 if (encap_limit >= 0) {
710 init_tel_txopt(&opt, encap_limit);
711 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
712 }
713
714 if (likely(!skb->encapsulation)) {
715 skb_reset_inner_headers(skb);
716 skb->encapsulation = 1;
717 }
718
719 skb_push(skb, gre_hlen);
720 skb_reset_network_header(skb);
721 skb_set_transport_header(skb, sizeof(*ipv6h));
722
723 /*
724 * Push down and install the IP header.
725 */
726 ipv6h = ipv6_hdr(skb);
727 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield),
728 ip6_make_flowlabel(net, skb, fl6->flowlabel, false));
729 ipv6h->hop_limit = tunnel->parms.hop_limit;
730 ipv6h->nexthdr = proto;
731 ipv6h->saddr = fl6->saddr;
732 ipv6h->daddr = fl6->daddr;
733
734 ((__be16 *)(ipv6h + 1))[0] = tunnel->parms.o_flags;
735 ((__be16 *)(ipv6h + 1))[1] = (dev->type == ARPHRD_ETHER) ?
736 htons(ETH_P_TEB) : skb->protocol;
737
738 if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) {
739 __be32 *ptr = (__be32 *)(((u8 *)ipv6h) + tunnel->hlen - 4);
740
741 if (tunnel->parms.o_flags&GRE_SEQ) {
742 ++tunnel->o_seqno;
743 *ptr = htonl(tunnel->o_seqno);
744 ptr--;
745 }
746 if (tunnel->parms.o_flags&GRE_KEY) {
747 *ptr = tunnel->parms.o_key;
748 ptr--;
749 }
750 if (tunnel->parms.o_flags&GRE_CSUM) {
751 *ptr = 0;
752 *(__sum16 *)ptr = ip_compute_csum((void *)(ipv6h+1),
753 skb->len - sizeof(struct ipv6hdr));
754 }
755 }
756
757 ip6tunnel_xmit(skb, dev);
758 if (ndst)
759 ip6_tnl_dst_store(tunnel, ndst);
760 return 0;
761 tx_err_link_failure:
762 stats->tx_carrier_errors++;
763 dst_link_failure(skb);
764 tx_err_dst_release:
765 dst_release(ndst);
766 return err;
767 }
768
769 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
770 {
771 struct ip6_tnl *t = netdev_priv(dev);
772 const struct iphdr *iph = ip_hdr(skb);
773 int encap_limit = -1;
774 struct flowi6 fl6;
775 __u8 dsfield;
776 __u32 mtu;
777 int err;
778
779 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
780 encap_limit = t->parms.encap_limit;
781
782 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
783 fl6.flowi6_proto = IPPROTO_IPIP;
784
785 dsfield = ipv4_get_dsfield(iph);
786
787 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
788 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
789 & IPV6_TCLASS_MASK;
790 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
791 fl6.flowi6_mark = skb->mark;
792
793 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
794 if (err != 0) {
795 /* XXX: send ICMP error even if DF is not set. */
796 if (err == -EMSGSIZE)
797 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
798 htonl(mtu));
799 return -1;
800 }
801
802 return 0;
803 }
804
805 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
806 {
807 struct ip6_tnl *t = netdev_priv(dev);
808 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
809 int encap_limit = -1;
810 __u16 offset;
811 struct flowi6 fl6;
812 __u8 dsfield;
813 __u32 mtu;
814 int err;
815
816 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
817 return -1;
818
819 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
820 if (offset > 0) {
821 struct ipv6_tlv_tnl_enc_lim *tel;
822 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
823 if (tel->encap_limit == 0) {
824 icmpv6_send(skb, ICMPV6_PARAMPROB,
825 ICMPV6_HDR_FIELD, offset + 2);
826 return -1;
827 }
828 encap_limit = tel->encap_limit - 1;
829 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
830 encap_limit = t->parms.encap_limit;
831
832 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
833 fl6.flowi6_proto = IPPROTO_IPV6;
834
835 dsfield = ipv6_get_dsfield(ipv6h);
836 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
837 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
838 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
839 fl6.flowlabel |= ip6_flowlabel(ipv6h);
840 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
841 fl6.flowi6_mark = skb->mark;
842
843 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
844 if (err != 0) {
845 if (err == -EMSGSIZE)
846 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
847 return -1;
848 }
849
850 return 0;
851 }
852
853 /**
854 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
855 * @t: the outgoing tunnel device
856 * @hdr: IPv6 header from the incoming packet
857 *
858 * Description:
859 * Avoid trivial tunneling loop by checking that tunnel exit-point
860 * doesn't match source of incoming packet.
861 *
862 * Return:
863 * 1 if conflict,
864 * 0 else
865 **/
866
867 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
868 const struct ipv6hdr *hdr)
869 {
870 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
871 }
872
873 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
874 {
875 struct ip6_tnl *t = netdev_priv(dev);
876 int encap_limit = -1;
877 struct flowi6 fl6;
878 __u32 mtu;
879 int err;
880
881 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
882 encap_limit = t->parms.encap_limit;
883
884 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
885 fl6.flowi6_proto = skb->protocol;
886
887 err = ip6gre_xmit2(skb, dev, 0, &fl6, encap_limit, &mtu);
888
889 return err;
890 }
891
892 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
893 struct net_device *dev)
894 {
895 struct ip6_tnl *t = netdev_priv(dev);
896 struct net_device_stats *stats = &t->dev->stats;
897 int ret;
898
899 if (!ip6_tnl_xmit_ctl(t))
900 goto tx_err;
901
902 switch (skb->protocol) {
903 case htons(ETH_P_IP):
904 ret = ip6gre_xmit_ipv4(skb, dev);
905 break;
906 case htons(ETH_P_IPV6):
907 ret = ip6gre_xmit_ipv6(skb, dev);
908 break;
909 default:
910 ret = ip6gre_xmit_other(skb, dev);
911 break;
912 }
913
914 if (ret < 0)
915 goto tx_err;
916
917 return NETDEV_TX_OK;
918
919 tx_err:
920 stats->tx_errors++;
921 stats->tx_dropped++;
922 kfree_skb(skb);
923 return NETDEV_TX_OK;
924 }
925
926 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
927 {
928 struct net_device *dev = t->dev;
929 struct __ip6_tnl_parm *p = &t->parms;
930 struct flowi6 *fl6 = &t->fl.u.ip6;
931 int addend = sizeof(struct ipv6hdr) + 4;
932
933 if (dev->type != ARPHRD_ETHER) {
934 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
935 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
936 }
937
938 /* Set up flowi template */
939 fl6->saddr = p->laddr;
940 fl6->daddr = p->raddr;
941 fl6->flowi6_oif = p->link;
942 fl6->flowlabel = 0;
943
944 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
945 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
946 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
947 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
948
949 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
950 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
951
952 if (p->flags&IP6_TNL_F_CAP_XMIT &&
953 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
954 dev->flags |= IFF_POINTOPOINT;
955 else
956 dev->flags &= ~IFF_POINTOPOINT;
957
958 dev->iflink = p->link;
959
960 /* Precalculate GRE options length */
961 if (t->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) {
962 if (t->parms.o_flags&GRE_CSUM)
963 addend += 4;
964 if (t->parms.o_flags&GRE_KEY)
965 addend += 4;
966 if (t->parms.o_flags&GRE_SEQ)
967 addend += 4;
968 }
969 t->hlen = addend;
970
971 if (p->flags & IP6_TNL_F_CAP_XMIT) {
972 int strict = (ipv6_addr_type(&p->raddr) &
973 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
974
975 struct rt6_info *rt = rt6_lookup(t->net,
976 &p->raddr, &p->laddr,
977 p->link, strict);
978
979 if (rt == NULL)
980 return;
981
982 if (rt->dst.dev) {
983 dev->hard_header_len = rt->dst.dev->hard_header_len + addend;
984
985 if (set_mtu) {
986 dev->mtu = rt->dst.dev->mtu - addend;
987 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
988 dev->mtu -= 8;
989
990 if (dev->mtu < IPV6_MIN_MTU)
991 dev->mtu = IPV6_MIN_MTU;
992 }
993 }
994 ip6_rt_put(rt);
995 }
996 }
997
998 static int ip6gre_tnl_change(struct ip6_tnl *t,
999 const struct __ip6_tnl_parm *p, int set_mtu)
1000 {
1001 t->parms.laddr = p->laddr;
1002 t->parms.raddr = p->raddr;
1003 t->parms.flags = p->flags;
1004 t->parms.hop_limit = p->hop_limit;
1005 t->parms.encap_limit = p->encap_limit;
1006 t->parms.flowinfo = p->flowinfo;
1007 t->parms.link = p->link;
1008 t->parms.proto = p->proto;
1009 t->parms.i_key = p->i_key;
1010 t->parms.o_key = p->o_key;
1011 t->parms.i_flags = p->i_flags;
1012 t->parms.o_flags = p->o_flags;
1013 ip6_tnl_dst_reset(t);
1014 ip6gre_tnl_link_config(t, set_mtu);
1015 return 0;
1016 }
1017
1018 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1019 const struct ip6_tnl_parm2 *u)
1020 {
1021 p->laddr = u->laddr;
1022 p->raddr = u->raddr;
1023 p->flags = u->flags;
1024 p->hop_limit = u->hop_limit;
1025 p->encap_limit = u->encap_limit;
1026 p->flowinfo = u->flowinfo;
1027 p->link = u->link;
1028 p->i_key = u->i_key;
1029 p->o_key = u->o_key;
1030 p->i_flags = u->i_flags;
1031 p->o_flags = u->o_flags;
1032 memcpy(p->name, u->name, sizeof(u->name));
1033 }
1034
1035 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1036 const struct __ip6_tnl_parm *p)
1037 {
1038 u->proto = IPPROTO_GRE;
1039 u->laddr = p->laddr;
1040 u->raddr = p->raddr;
1041 u->flags = p->flags;
1042 u->hop_limit = p->hop_limit;
1043 u->encap_limit = p->encap_limit;
1044 u->flowinfo = p->flowinfo;
1045 u->link = p->link;
1046 u->i_key = p->i_key;
1047 u->o_key = p->o_key;
1048 u->i_flags = p->i_flags;
1049 u->o_flags = p->o_flags;
1050 memcpy(u->name, p->name, sizeof(u->name));
1051 }
1052
1053 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1054 struct ifreq *ifr, int cmd)
1055 {
1056 int err = 0;
1057 struct ip6_tnl_parm2 p;
1058 struct __ip6_tnl_parm p1;
1059 struct ip6_tnl *t = netdev_priv(dev);
1060 struct net *net = t->net;
1061 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1062
1063 switch (cmd) {
1064 case SIOCGETTUNNEL:
1065 if (dev == ign->fb_tunnel_dev) {
1066 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1067 err = -EFAULT;
1068 break;
1069 }
1070 ip6gre_tnl_parm_from_user(&p1, &p);
1071 t = ip6gre_tunnel_locate(net, &p1, 0);
1072 if (t == NULL)
1073 t = netdev_priv(dev);
1074 }
1075 memset(&p, 0, sizeof(p));
1076 ip6gre_tnl_parm_to_user(&p, &t->parms);
1077 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1078 err = -EFAULT;
1079 break;
1080
1081 case SIOCADDTUNNEL:
1082 case SIOCCHGTUNNEL:
1083 err = -EPERM;
1084 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1085 goto done;
1086
1087 err = -EFAULT;
1088 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1089 goto done;
1090
1091 err = -EINVAL;
1092 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1093 goto done;
1094
1095 if (!(p.i_flags&GRE_KEY))
1096 p.i_key = 0;
1097 if (!(p.o_flags&GRE_KEY))
1098 p.o_key = 0;
1099
1100 ip6gre_tnl_parm_from_user(&p1, &p);
1101 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1102
1103 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1104 if (t != NULL) {
1105 if (t->dev != dev) {
1106 err = -EEXIST;
1107 break;
1108 }
1109 } else {
1110 t = netdev_priv(dev);
1111
1112 ip6gre_tunnel_unlink(ign, t);
1113 synchronize_net();
1114 ip6gre_tnl_change(t, &p1, 1);
1115 ip6gre_tunnel_link(ign, t);
1116 netdev_state_change(dev);
1117 }
1118 }
1119
1120 if (t) {
1121 err = 0;
1122
1123 memset(&p, 0, sizeof(p));
1124 ip6gre_tnl_parm_to_user(&p, &t->parms);
1125 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1126 err = -EFAULT;
1127 } else
1128 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1129 break;
1130
1131 case SIOCDELTUNNEL:
1132 err = -EPERM;
1133 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1134 goto done;
1135
1136 if (dev == ign->fb_tunnel_dev) {
1137 err = -EFAULT;
1138 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1139 goto done;
1140 err = -ENOENT;
1141 ip6gre_tnl_parm_from_user(&p1, &p);
1142 t = ip6gre_tunnel_locate(net, &p1, 0);
1143 if (t == NULL)
1144 goto done;
1145 err = -EPERM;
1146 if (t == netdev_priv(ign->fb_tunnel_dev))
1147 goto done;
1148 dev = t->dev;
1149 }
1150 unregister_netdevice(dev);
1151 err = 0;
1152 break;
1153
1154 default:
1155 err = -EINVAL;
1156 }
1157
1158 done:
1159 return err;
1160 }
1161
1162 static int ip6gre_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1163 {
1164 if (new_mtu < 68 ||
1165 new_mtu > 0xFFF8 - dev->hard_header_len)
1166 return -EINVAL;
1167 dev->mtu = new_mtu;
1168 return 0;
1169 }
1170
1171 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1172 unsigned short type,
1173 const void *daddr, const void *saddr, unsigned int len)
1174 {
1175 struct ip6_tnl *t = netdev_priv(dev);
1176 struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen);
1177 __be16 *p = (__be16 *)(ipv6h+1);
1178
1179 ip6_flow_hdr(ipv6h, 0,
1180 ip6_make_flowlabel(dev_net(dev), skb,
1181 t->fl.u.ip6.flowlabel, false));
1182 ipv6h->hop_limit = t->parms.hop_limit;
1183 ipv6h->nexthdr = NEXTHDR_GRE;
1184 ipv6h->saddr = t->parms.laddr;
1185 ipv6h->daddr = t->parms.raddr;
1186
1187 p[0] = t->parms.o_flags;
1188 p[1] = htons(type);
1189
1190 /*
1191 * Set the source hardware address.
1192 */
1193
1194 if (saddr)
1195 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1196 if (daddr)
1197 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1198 if (!ipv6_addr_any(&ipv6h->daddr))
1199 return t->hlen;
1200
1201 return -t->hlen;
1202 }
1203
1204 static const struct header_ops ip6gre_header_ops = {
1205 .create = ip6gre_header,
1206 };
1207
1208 static const struct net_device_ops ip6gre_netdev_ops = {
1209 .ndo_init = ip6gre_tunnel_init,
1210 .ndo_uninit = ip6gre_tunnel_uninit,
1211 .ndo_start_xmit = ip6gre_tunnel_xmit,
1212 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1213 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1214 .ndo_get_stats64 = ip_tunnel_get_stats64,
1215 };
1216
1217 static void ip6gre_dev_free(struct net_device *dev)
1218 {
1219 free_percpu(dev->tstats);
1220 free_netdev(dev);
1221 }
1222
1223 static void ip6gre_tunnel_setup(struct net_device *dev)
1224 {
1225 struct ip6_tnl *t;
1226
1227 dev->netdev_ops = &ip6gre_netdev_ops;
1228 dev->destructor = ip6gre_dev_free;
1229
1230 dev->type = ARPHRD_IP6GRE;
1231 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr) + 4;
1232 dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr) - 4;
1233 t = netdev_priv(dev);
1234 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1235 dev->mtu -= 8;
1236 dev->flags |= IFF_NOARP;
1237 dev->iflink = 0;
1238 dev->addr_len = sizeof(struct in6_addr);
1239 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1240 }
1241
1242 static int ip6gre_tunnel_init(struct net_device *dev)
1243 {
1244 struct ip6_tnl *tunnel;
1245 int i;
1246
1247 tunnel = netdev_priv(dev);
1248
1249 tunnel->dev = dev;
1250 tunnel->net = dev_net(dev);
1251 strcpy(tunnel->parms.name, dev->name);
1252
1253 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1254 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1255
1256 if (ipv6_addr_any(&tunnel->parms.raddr))
1257 dev->header_ops = &ip6gre_header_ops;
1258
1259 dev->tstats = alloc_percpu(struct pcpu_sw_netstats);
1260 if (!dev->tstats)
1261 return -ENOMEM;
1262
1263 for_each_possible_cpu(i) {
1264 struct pcpu_sw_netstats *ip6gre_tunnel_stats;
1265 ip6gre_tunnel_stats = per_cpu_ptr(dev->tstats, i);
1266 u64_stats_init(&ip6gre_tunnel_stats->syncp);
1267 }
1268
1269
1270 return 0;
1271 }
1272
1273 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1274 {
1275 struct ip6_tnl *tunnel = netdev_priv(dev);
1276
1277 tunnel->dev = dev;
1278 tunnel->net = dev_net(dev);
1279 strcpy(tunnel->parms.name, dev->name);
1280
1281 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1282
1283 dev_hold(dev);
1284 }
1285
1286
1287 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1288 .handler = ip6gre_rcv,
1289 .err_handler = ip6gre_err,
1290 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1291 };
1292
1293 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1294 {
1295 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1296 struct net_device *dev, *aux;
1297 int prio;
1298
1299 for_each_netdev_safe(net, dev, aux)
1300 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1301 dev->rtnl_link_ops == &ip6gre_tap_ops)
1302 unregister_netdevice_queue(dev, head);
1303
1304 for (prio = 0; prio < 4; prio++) {
1305 int h;
1306 for (h = 0; h < HASH_SIZE; h++) {
1307 struct ip6_tnl *t;
1308
1309 t = rtnl_dereference(ign->tunnels[prio][h]);
1310
1311 while (t != NULL) {
1312 /* If dev is in the same netns, it has already
1313 * been added to the list by the previous loop.
1314 */
1315 if (!net_eq(dev_net(t->dev), net))
1316 unregister_netdevice_queue(t->dev,
1317 head);
1318 t = rtnl_dereference(t->next);
1319 }
1320 }
1321 }
1322 }
1323
1324 static int __net_init ip6gre_init_net(struct net *net)
1325 {
1326 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1327 int err;
1328
1329 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1330 NET_NAME_UNKNOWN,
1331 ip6gre_tunnel_setup);
1332 if (!ign->fb_tunnel_dev) {
1333 err = -ENOMEM;
1334 goto err_alloc_dev;
1335 }
1336 dev_net_set(ign->fb_tunnel_dev, net);
1337 /* FB netdevice is special: we have one, and only one per netns.
1338 * Allowing to move it to another netns is clearly unsafe.
1339 */
1340 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1341
1342
1343 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1344 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1345
1346 err = register_netdev(ign->fb_tunnel_dev);
1347 if (err)
1348 goto err_reg_dev;
1349
1350 rcu_assign_pointer(ign->tunnels_wc[0],
1351 netdev_priv(ign->fb_tunnel_dev));
1352 return 0;
1353
1354 err_reg_dev:
1355 ip6gre_dev_free(ign->fb_tunnel_dev);
1356 err_alloc_dev:
1357 return err;
1358 }
1359
1360 static void __net_exit ip6gre_exit_net(struct net *net)
1361 {
1362 LIST_HEAD(list);
1363
1364 rtnl_lock();
1365 ip6gre_destroy_tunnels(net, &list);
1366 unregister_netdevice_many(&list);
1367 rtnl_unlock();
1368 }
1369
1370 static struct pernet_operations ip6gre_net_ops = {
1371 .init = ip6gre_init_net,
1372 .exit = ip6gre_exit_net,
1373 .id = &ip6gre_net_id,
1374 .size = sizeof(struct ip6gre_net),
1375 };
1376
1377 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
1378 {
1379 __be16 flags;
1380
1381 if (!data)
1382 return 0;
1383
1384 flags = 0;
1385 if (data[IFLA_GRE_IFLAGS])
1386 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1387 if (data[IFLA_GRE_OFLAGS])
1388 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1389 if (flags & (GRE_VERSION|GRE_ROUTING))
1390 return -EINVAL;
1391
1392 return 0;
1393 }
1394
1395 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
1396 {
1397 struct in6_addr daddr;
1398
1399 if (tb[IFLA_ADDRESS]) {
1400 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1401 return -EINVAL;
1402 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1403 return -EADDRNOTAVAIL;
1404 }
1405
1406 if (!data)
1407 goto out;
1408
1409 if (data[IFLA_GRE_REMOTE]) {
1410 nla_memcpy(&daddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1411 if (ipv6_addr_any(&daddr))
1412 return -EINVAL;
1413 }
1414
1415 out:
1416 return ip6gre_tunnel_validate(tb, data);
1417 }
1418
1419
1420 static void ip6gre_netlink_parms(struct nlattr *data[],
1421 struct __ip6_tnl_parm *parms)
1422 {
1423 memset(parms, 0, sizeof(*parms));
1424
1425 if (!data)
1426 return;
1427
1428 if (data[IFLA_GRE_LINK])
1429 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1430
1431 if (data[IFLA_GRE_IFLAGS])
1432 parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]);
1433
1434 if (data[IFLA_GRE_OFLAGS])
1435 parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]);
1436
1437 if (data[IFLA_GRE_IKEY])
1438 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1439
1440 if (data[IFLA_GRE_OKEY])
1441 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1442
1443 if (data[IFLA_GRE_LOCAL])
1444 nla_memcpy(&parms->laddr, data[IFLA_GRE_LOCAL], sizeof(struct in6_addr));
1445
1446 if (data[IFLA_GRE_REMOTE])
1447 nla_memcpy(&parms->raddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1448
1449 if (data[IFLA_GRE_TTL])
1450 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1451
1452 if (data[IFLA_GRE_ENCAP_LIMIT])
1453 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1454
1455 if (data[IFLA_GRE_FLOWINFO])
1456 parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]);
1457
1458 if (data[IFLA_GRE_FLAGS])
1459 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1460 }
1461
1462 static int ip6gre_tap_init(struct net_device *dev)
1463 {
1464 struct ip6_tnl *tunnel;
1465
1466 tunnel = netdev_priv(dev);
1467
1468 tunnel->dev = dev;
1469 tunnel->net = dev_net(dev);
1470 strcpy(tunnel->parms.name, dev->name);
1471
1472 ip6gre_tnl_link_config(tunnel, 1);
1473
1474 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1475 if (!dev->tstats)
1476 return -ENOMEM;
1477
1478 return 0;
1479 }
1480
1481 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1482 .ndo_init = ip6gre_tap_init,
1483 .ndo_uninit = ip6gre_tunnel_uninit,
1484 .ndo_start_xmit = ip6gre_tunnel_xmit,
1485 .ndo_set_mac_address = eth_mac_addr,
1486 .ndo_validate_addr = eth_validate_addr,
1487 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
1488 .ndo_get_stats64 = ip_tunnel_get_stats64,
1489 };
1490
1491 static void ip6gre_tap_setup(struct net_device *dev)
1492 {
1493
1494 ether_setup(dev);
1495
1496 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1497 dev->destructor = ip6gre_dev_free;
1498
1499 dev->iflink = 0;
1500 dev->features |= NETIF_F_NETNS_LOCAL;
1501 }
1502
1503 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1504 struct nlattr *tb[], struct nlattr *data[])
1505 {
1506 struct ip6_tnl *nt;
1507 struct net *net = dev_net(dev);
1508 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1509 int err;
1510
1511 nt = netdev_priv(dev);
1512 ip6gre_netlink_parms(data, &nt->parms);
1513
1514 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1515 return -EEXIST;
1516
1517 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1518 eth_hw_addr_random(dev);
1519
1520 nt->dev = dev;
1521 nt->net = dev_net(dev);
1522 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1523
1524 /* Can use a lockless transmit, unless we generate output sequences */
1525 if (!(nt->parms.o_flags & GRE_SEQ))
1526 dev->features |= NETIF_F_LLTX;
1527
1528 err = register_netdevice(dev);
1529 if (err)
1530 goto out;
1531
1532 dev_hold(dev);
1533 ip6gre_tunnel_link(ign, nt);
1534
1535 out:
1536 return err;
1537 }
1538
1539 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1540 struct nlattr *data[])
1541 {
1542 struct ip6_tnl *t, *nt = netdev_priv(dev);
1543 struct net *net = nt->net;
1544 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1545 struct __ip6_tnl_parm p;
1546
1547 if (dev == ign->fb_tunnel_dev)
1548 return -EINVAL;
1549
1550 ip6gre_netlink_parms(data, &p);
1551
1552 t = ip6gre_tunnel_locate(net, &p, 0);
1553
1554 if (t) {
1555 if (t->dev != dev)
1556 return -EEXIST;
1557 } else {
1558 t = nt;
1559
1560 ip6gre_tunnel_unlink(ign, t);
1561 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1562 ip6gre_tunnel_link(ign, t);
1563 netdev_state_change(dev);
1564 }
1565
1566 return 0;
1567 }
1568
1569 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
1570 {
1571 struct net *net = dev_net(dev);
1572 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1573
1574 if (dev != ign->fb_tunnel_dev)
1575 unregister_netdevice_queue(dev, head);
1576 }
1577
1578 static size_t ip6gre_get_size(const struct net_device *dev)
1579 {
1580 return
1581 /* IFLA_GRE_LINK */
1582 nla_total_size(4) +
1583 /* IFLA_GRE_IFLAGS */
1584 nla_total_size(2) +
1585 /* IFLA_GRE_OFLAGS */
1586 nla_total_size(2) +
1587 /* IFLA_GRE_IKEY */
1588 nla_total_size(4) +
1589 /* IFLA_GRE_OKEY */
1590 nla_total_size(4) +
1591 /* IFLA_GRE_LOCAL */
1592 nla_total_size(sizeof(struct in6_addr)) +
1593 /* IFLA_GRE_REMOTE */
1594 nla_total_size(sizeof(struct in6_addr)) +
1595 /* IFLA_GRE_TTL */
1596 nla_total_size(1) +
1597 /* IFLA_GRE_TOS */
1598 nla_total_size(1) +
1599 /* IFLA_GRE_ENCAP_LIMIT */
1600 nla_total_size(1) +
1601 /* IFLA_GRE_FLOWINFO */
1602 nla_total_size(4) +
1603 /* IFLA_GRE_FLAGS */
1604 nla_total_size(4) +
1605 0;
1606 }
1607
1608 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1609 {
1610 struct ip6_tnl *t = netdev_priv(dev);
1611 struct __ip6_tnl_parm *p = &t->parms;
1612
1613 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1614 nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) ||
1615 nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) ||
1616 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1617 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
1618 nla_put(skb, IFLA_GRE_LOCAL, sizeof(struct in6_addr), &p->laddr) ||
1619 nla_put(skb, IFLA_GRE_REMOTE, sizeof(struct in6_addr), &p->raddr) ||
1620 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1621 /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/
1622 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1623 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1624 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags))
1625 goto nla_put_failure;
1626 return 0;
1627
1628 nla_put_failure:
1629 return -EMSGSIZE;
1630 }
1631
1632 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1633 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1634 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1635 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1636 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1637 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1638 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1639 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1640 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1641 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1642 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1643 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1644 };
1645
1646 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1647 .kind = "ip6gre",
1648 .maxtype = IFLA_GRE_MAX,
1649 .policy = ip6gre_policy,
1650 .priv_size = sizeof(struct ip6_tnl),
1651 .setup = ip6gre_tunnel_setup,
1652 .validate = ip6gre_tunnel_validate,
1653 .newlink = ip6gre_newlink,
1654 .changelink = ip6gre_changelink,
1655 .dellink = ip6gre_dellink,
1656 .get_size = ip6gre_get_size,
1657 .fill_info = ip6gre_fill_info,
1658 };
1659
1660 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1661 .kind = "ip6gretap",
1662 .maxtype = IFLA_GRE_MAX,
1663 .policy = ip6gre_policy,
1664 .priv_size = sizeof(struct ip6_tnl),
1665 .setup = ip6gre_tap_setup,
1666 .validate = ip6gre_tap_validate,
1667 .newlink = ip6gre_newlink,
1668 .changelink = ip6gre_changelink,
1669 .get_size = ip6gre_get_size,
1670 .fill_info = ip6gre_fill_info,
1671 };
1672
1673 /*
1674 * And now the modules code and kernel interface.
1675 */
1676
1677 static int __init ip6gre_init(void)
1678 {
1679 int err;
1680
1681 pr_info("GRE over IPv6 tunneling driver\n");
1682
1683 err = register_pernet_device(&ip6gre_net_ops);
1684 if (err < 0)
1685 return err;
1686
1687 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1688 if (err < 0) {
1689 pr_info("%s: can't add protocol\n", __func__);
1690 goto add_proto_failed;
1691 }
1692
1693 err = rtnl_link_register(&ip6gre_link_ops);
1694 if (err < 0)
1695 goto rtnl_link_failed;
1696
1697 err = rtnl_link_register(&ip6gre_tap_ops);
1698 if (err < 0)
1699 goto tap_ops_failed;
1700
1701 out:
1702 return err;
1703
1704 tap_ops_failed:
1705 rtnl_link_unregister(&ip6gre_link_ops);
1706 rtnl_link_failed:
1707 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1708 add_proto_failed:
1709 unregister_pernet_device(&ip6gre_net_ops);
1710 goto out;
1711 }
1712
1713 static void __exit ip6gre_fini(void)
1714 {
1715 rtnl_link_unregister(&ip6gre_tap_ops);
1716 rtnl_link_unregister(&ip6gre_link_ops);
1717 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1718 unregister_pernet_device(&ip6gre_net_ops);
1719 }
1720
1721 module_init(ip6gre_init);
1722 module_exit(ip6gre_fini);
1723 MODULE_LICENSE("GPL");
1724 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1725 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1726 MODULE_ALIAS_RTNL_LINK("ip6gre");
1727 MODULE_ALIAS_NETDEV("ip6gre0");
Linux kernel - Deliverables
This page took 0.064995 seconds and 6 git commands to generate.