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7
8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10#include <linux/capability.h>
11#include <linux/module.h>
12#include <linux/types.h>
13#include <linux/kernel.h>
14#include <linux/slab.h>
15#include <linux/uaccess.h>
16#include <linux/skbuff.h>
17#include <linux/netdevice.h>
18#include <linux/in.h>
19#include <linux/tcp.h>
20#include <linux/udp.h>
21#include <linux/if_arp.h>
22#include <linux/init.h>
23#include <linux/in6.h>
24#include <linux/inetdevice.h>
25#include <linux/igmp.h>
26#include <linux/netfilter_ipv4.h>
27#include <linux/etherdevice.h>
28#include <linux/if_ether.h>
29#include <linux/hash.h>
30#include <linux/if_tunnel.h>
31#include <linux/ip6_tunnel.h>
32
33#include <net/sock.h>
34#include <net/ip.h>
35#include <net/ip_tunnels.h>
36#include <net/icmp.h>
37#include <net/protocol.h>
38#include <net/addrconf.h>
39#include <net/arp.h>
40#include <net/checksum.h>
41#include <net/dsfield.h>
42#include <net/inet_ecn.h>
43#include <net/xfrm.h>
44#include <net/net_namespace.h>
45#include <net/netns/generic.h>
46#include <net/rtnetlink.h>
47
48#include <net/ipv6.h>
49#include <net/ip6_fib.h>
50#include <net/ip6_route.h>
51#include <net/ip6_tunnel.h>
52#include <net/gre.h>
53#include <net/erspan.h>
54#include <net/dst_metadata.h>
55
56
57static bool log_ecn_error = true;
58module_param(log_ecn_error, bool, 0644);
59MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
60
61#define IP6_GRE_HASH_SIZE_SHIFT 5
62#define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
63
64static unsigned int ip6gre_net_id __read_mostly;
65struct ip6gre_net {
66 struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
67
68 struct ip6_tnl __rcu *collect_md_tun;
69 struct ip6_tnl __rcu *collect_md_tun_erspan;
70 struct net_device *fb_tunnel_dev;
71};
72
73static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
74static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
75static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly;
76static int ip6gre_tunnel_init(struct net_device *dev);
77static void ip6gre_tunnel_setup(struct net_device *dev);
78static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
79static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
80static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu);
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100#define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
101static u32 HASH_ADDR(const struct in6_addr *addr)
102{
103 u32 hash = ipv6_addr_hash(addr);
104
105 return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
106}
107
108#define tunnels_r_l tunnels[3]
109#define tunnels_r tunnels[2]
110#define tunnels_l tunnels[1]
111#define tunnels_wc tunnels[0]
112
113
114
115static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
116 const struct in6_addr *remote, const struct in6_addr *local,
117 __be32 key, __be16 gre_proto)
118{
119 struct net *net = dev_net(dev);
120 int link = dev->ifindex;
121 unsigned int h0 = HASH_ADDR(remote);
122 unsigned int h1 = HASH_KEY(key);
123 struct ip6_tnl *t, *cand = NULL;
124 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
125 int dev_type = (gre_proto == htons(ETH_P_TEB) ||
126 gre_proto == htons(ETH_P_ERSPAN) ||
127 gre_proto == htons(ETH_P_ERSPAN2)) ?
128 ARPHRD_ETHER : ARPHRD_IP6GRE;
129 int score, cand_score = 4;
130 struct net_device *ndev;
131
132 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
133 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
134 !ipv6_addr_equal(remote, &t->parms.raddr) ||
135 key != t->parms.i_key ||
136 !(t->dev->flags & IFF_UP))
137 continue;
138
139 if (t->dev->type != ARPHRD_IP6GRE &&
140 t->dev->type != dev_type)
141 continue;
142
143 score = 0;
144 if (t->parms.link != link)
145 score |= 1;
146 if (t->dev->type != dev_type)
147 score |= 2;
148 if (score == 0)
149 return t;
150
151 if (score < cand_score) {
152 cand = t;
153 cand_score = score;
154 }
155 }
156
157 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
158 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
159 key != t->parms.i_key ||
160 !(t->dev->flags & IFF_UP))
161 continue;
162
163 if (t->dev->type != ARPHRD_IP6GRE &&
164 t->dev->type != dev_type)
165 continue;
166
167 score = 0;
168 if (t->parms.link != link)
169 score |= 1;
170 if (t->dev->type != dev_type)
171 score |= 2;
172 if (score == 0)
173 return t;
174
175 if (score < cand_score) {
176 cand = t;
177 cand_score = score;
178 }
179 }
180
181 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
182 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
183 (!ipv6_addr_equal(local, &t->parms.raddr) ||
184 !ipv6_addr_is_multicast(local))) ||
185 key != t->parms.i_key ||
186 !(t->dev->flags & IFF_UP))
187 continue;
188
189 if (t->dev->type != ARPHRD_IP6GRE &&
190 t->dev->type != dev_type)
191 continue;
192
193 score = 0;
194 if (t->parms.link != link)
195 score |= 1;
196 if (t->dev->type != dev_type)
197 score |= 2;
198 if (score == 0)
199 return t;
200
201 if (score < cand_score) {
202 cand = t;
203 cand_score = score;
204 }
205 }
206
207 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
208 if (t->parms.i_key != key ||
209 !(t->dev->flags & IFF_UP))
210 continue;
211
212 if (t->dev->type != ARPHRD_IP6GRE &&
213 t->dev->type != dev_type)
214 continue;
215
216 score = 0;
217 if (t->parms.link != link)
218 score |= 1;
219 if (t->dev->type != dev_type)
220 score |= 2;
221 if (score == 0)
222 return t;
223
224 if (score < cand_score) {
225 cand = t;
226 cand_score = score;
227 }
228 }
229
230 if (cand)
231 return cand;
232
233 if (gre_proto == htons(ETH_P_ERSPAN) ||
234 gre_proto == htons(ETH_P_ERSPAN2))
235 t = rcu_dereference(ign->collect_md_tun_erspan);
236 else
237 t = rcu_dereference(ign->collect_md_tun);
238
239 if (t && t->dev->flags & IFF_UP)
240 return t;
241
242 ndev = READ_ONCE(ign->fb_tunnel_dev);
243 if (ndev && ndev->flags & IFF_UP)
244 return netdev_priv(ndev);
245
246 return NULL;
247}
248
249static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
250 const struct __ip6_tnl_parm *p)
251{
252 const struct in6_addr *remote = &p->raddr;
253 const struct in6_addr *local = &p->laddr;
254 unsigned int h = HASH_KEY(p->i_key);
255 int prio = 0;
256
257 if (!ipv6_addr_any(local))
258 prio |= 1;
259 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
260 prio |= 2;
261 h ^= HASH_ADDR(remote);
262 }
263
264 return &ign->tunnels[prio][h];
265}
266
267static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
268{
269 if (t->parms.collect_md)
270 rcu_assign_pointer(ign->collect_md_tun, t);
271}
272
273static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
274{
275 if (t->parms.collect_md)
276 rcu_assign_pointer(ign->collect_md_tun_erspan, t);
277}
278
279static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t)
280{
281 if (t->parms.collect_md)
282 rcu_assign_pointer(ign->collect_md_tun, NULL);
283}
284
285static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign,
286 struct ip6_tnl *t)
287{
288 if (t->parms.collect_md)
289 rcu_assign_pointer(ign->collect_md_tun_erspan, NULL);
290}
291
292static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
293 const struct ip6_tnl *t)
294{
295 return __ip6gre_bucket(ign, &t->parms);
296}
297
298static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
299{
300 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
301
302 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
303 rcu_assign_pointer(*tp, t);
304}
305
306static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
307{
308 struct ip6_tnl __rcu **tp;
309 struct ip6_tnl *iter;
310
311 for (tp = ip6gre_bucket(ign, t);
312 (iter = rtnl_dereference(*tp)) != NULL;
313 tp = &iter->next) {
314 if (t == iter) {
315 rcu_assign_pointer(*tp, t->next);
316 break;
317 }
318 }
319}
320
321static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
322 const struct __ip6_tnl_parm *parms,
323 int type)
324{
325 const struct in6_addr *remote = &parms->raddr;
326 const struct in6_addr *local = &parms->laddr;
327 __be32 key = parms->i_key;
328 int link = parms->link;
329 struct ip6_tnl *t;
330 struct ip6_tnl __rcu **tp;
331 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
332
333 for (tp = __ip6gre_bucket(ign, parms);
334 (t = rtnl_dereference(*tp)) != NULL;
335 tp = &t->next)
336 if (ipv6_addr_equal(local, &t->parms.laddr) &&
337 ipv6_addr_equal(remote, &t->parms.raddr) &&
338 key == t->parms.i_key &&
339 link == t->parms.link &&
340 type == t->dev->type)
341 break;
342
343 return t;
344}
345
346static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
347 const struct __ip6_tnl_parm *parms, int create)
348{
349 struct ip6_tnl *t, *nt;
350 struct net_device *dev;
351 char name[IFNAMSIZ];
352 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
353
354 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
355 if (t && create)
356 return NULL;
357 if (t || !create)
358 return t;
359
360 if (parms->name[0]) {
361 if (!dev_valid_name(parms->name))
362 return NULL;
363 strlcpy(name, parms->name, IFNAMSIZ);
364 } else {
365 strcpy(name, "ip6gre%d");
366 }
367 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
368 ip6gre_tunnel_setup);
369 if (!dev)
370 return NULL;
371
372 dev_net_set(dev, net);
373
374 nt = netdev_priv(dev);
375 nt->parms = *parms;
376 dev->rtnl_link_ops = &ip6gre_link_ops;
377
378 nt->dev = dev;
379 nt->net = dev_net(dev);
380
381 if (register_netdevice(dev) < 0)
382 goto failed_free;
383
384 ip6gre_tnl_link_config(nt, 1);
385 ip6gre_tunnel_link(ign, nt);
386 return nt;
387
388failed_free:
389 free_netdev(dev);
390 return NULL;
391}
392
393static void ip6erspan_tunnel_uninit(struct net_device *dev)
394{
395 struct ip6_tnl *t = netdev_priv(dev);
396 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
397
398 ip6erspan_tunnel_unlink_md(ign, t);
399 ip6gre_tunnel_unlink(ign, t);
400 dst_cache_reset(&t->dst_cache);
401 dev_put_track(dev, &t->dev_tracker);
402}
403
404static void ip6gre_tunnel_uninit(struct net_device *dev)
405{
406 struct ip6_tnl *t = netdev_priv(dev);
407 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
408
409 ip6gre_tunnel_unlink_md(ign, t);
410 ip6gre_tunnel_unlink(ign, t);
411 if (ign->fb_tunnel_dev == dev)
412 WRITE_ONCE(ign->fb_tunnel_dev, NULL);
413 dst_cache_reset(&t->dst_cache);
414 dev_put_track(dev, &t->dev_tracker);
415}
416
417
418static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
419 u8 type, u8 code, int offset, __be32 info)
420{
421 struct net *net = dev_net(skb->dev);
422 const struct ipv6hdr *ipv6h;
423 struct tnl_ptk_info tpi;
424 struct ip6_tnl *t;
425
426 if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6),
427 offset) < 0)
428 return -EINVAL;
429
430 ipv6h = (const struct ipv6hdr *)skb->data;
431 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
432 tpi.key, tpi.proto);
433 if (!t)
434 return -ENOENT;
435
436 switch (type) {
437 case ICMPV6_DEST_UNREACH:
438 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
439 t->parms.name);
440 if (code != ICMPV6_PORT_UNREACH)
441 break;
442 return 0;
443 case ICMPV6_TIME_EXCEED:
444 if (code == ICMPV6_EXC_HOPLIMIT) {
445 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
446 t->parms.name);
447 break;
448 }
449 return 0;
450 case ICMPV6_PARAMPROB: {
451 struct ipv6_tlv_tnl_enc_lim *tel;
452 __u32 teli;
453
454 teli = 0;
455 if (code == ICMPV6_HDR_FIELD)
456 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
457
458 if (teli && teli == be32_to_cpu(info) - 2) {
459 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
460 if (tel->encap_limit == 0) {
461 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
462 t->parms.name);
463 }
464 } else {
465 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
466 t->parms.name);
467 }
468 return 0;
469 }
470 case ICMPV6_PKT_TOOBIG:
471 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
472 return 0;
473 case NDISC_REDIRECT:
474 ip6_redirect(skb, net, skb->dev->ifindex, 0,
475 sock_net_uid(net, NULL));
476 return 0;
477 }
478
479 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
480 t->err_count++;
481 else
482 t->err_count = 1;
483 t->err_time = jiffies;
484
485 return 0;
486}
487
488static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
489{
490 const struct ipv6hdr *ipv6h;
491 struct ip6_tnl *tunnel;
492
493 ipv6h = ipv6_hdr(skb);
494 tunnel = ip6gre_tunnel_lookup(skb->dev,
495 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
496 tpi->proto);
497 if (tunnel) {
498 if (tunnel->parms.collect_md) {
499 struct metadata_dst *tun_dst;
500 __be64 tun_id;
501 __be16 flags;
502
503 flags = tpi->flags;
504 tun_id = key32_to_tunnel_id(tpi->key);
505
506 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
507 if (!tun_dst)
508 return PACKET_REJECT;
509
510 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
511 } else {
512 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
513 }
514
515 return PACKET_RCVD;
516 }
517
518 return PACKET_REJECT;
519}
520
521static int ip6erspan_rcv(struct sk_buff *skb,
522 struct tnl_ptk_info *tpi,
523 int gre_hdr_len)
524{
525 struct erspan_base_hdr *ershdr;
526 const struct ipv6hdr *ipv6h;
527 struct erspan_md2 *md2;
528 struct ip6_tnl *tunnel;
529 u8 ver;
530
531 ipv6h = ipv6_hdr(skb);
532 ershdr = (struct erspan_base_hdr *)skb->data;
533 ver = ershdr->ver;
534
535 tunnel = ip6gre_tunnel_lookup(skb->dev,
536 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
537 tpi->proto);
538 if (tunnel) {
539 int len = erspan_hdr_len(ver);
540
541 if (unlikely(!pskb_may_pull(skb, len)))
542 return PACKET_REJECT;
543
544 if (__iptunnel_pull_header(skb, len,
545 htons(ETH_P_TEB),
546 false, false) < 0)
547 return PACKET_REJECT;
548
549 if (tunnel->parms.collect_md) {
550 struct erspan_metadata *pkt_md, *md;
551 struct metadata_dst *tun_dst;
552 struct ip_tunnel_info *info;
553 unsigned char *gh;
554 __be64 tun_id;
555 __be16 flags;
556
557 tpi->flags |= TUNNEL_KEY;
558 flags = tpi->flags;
559 tun_id = key32_to_tunnel_id(tpi->key);
560
561 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
562 sizeof(*md));
563 if (!tun_dst)
564 return PACKET_REJECT;
565
566
567
568
569
570 gh = skb_network_header(skb) +
571 skb_network_header_len(skb);
572 pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len +
573 sizeof(*ershdr));
574 info = &tun_dst->u.tun_info;
575 md = ip_tunnel_info_opts(info);
576 md->version = ver;
577 md2 = &md->u.md2;
578 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
579 ERSPAN_V2_MDSIZE);
580 info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
581 info->options_len = sizeof(*md);
582
583 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
584
585 } else {
586 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
587 }
588
589 return PACKET_RCVD;
590 }
591
592 return PACKET_REJECT;
593}
594
595static int gre_rcv(struct sk_buff *skb)
596{
597 struct tnl_ptk_info tpi;
598 bool csum_err = false;
599 int hdr_len;
600
601 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
602 if (hdr_len < 0)
603 goto drop;
604
605 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
606 goto drop;
607
608 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
609 tpi.proto == htons(ETH_P_ERSPAN2))) {
610 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
611 return 0;
612 goto out;
613 }
614
615 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
616 return 0;
617
618out:
619 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
620drop:
621 kfree_skb(skb);
622 return 0;
623}
624
625static int gre_handle_offloads(struct sk_buff *skb, bool csum)
626{
627 return iptunnel_handle_offloads(skb,
628 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
629}
630
631static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
632 struct net_device *dev,
633 struct flowi6 *fl6, __u8 *dsfield,
634 int *encap_limit)
635{
636 const struct iphdr *iph = ip_hdr(skb);
637 struct ip6_tnl *t = netdev_priv(dev);
638
639 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
640 *encap_limit = t->parms.encap_limit;
641
642 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
643
644 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
645 *dsfield = ipv4_get_dsfield(iph);
646 else
647 *dsfield = ip6_tclass(t->parms.flowinfo);
648
649 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
650 fl6->flowi6_mark = skb->mark;
651 else
652 fl6->flowi6_mark = t->parms.fwmark;
653
654 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
655}
656
657static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
658 struct net_device *dev,
659 struct flowi6 *fl6, __u8 *dsfield,
660 int *encap_limit)
661{
662 struct ipv6hdr *ipv6h;
663 struct ip6_tnl *t = netdev_priv(dev);
664 __u16 offset;
665
666 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
667
668 ipv6h = ipv6_hdr(skb);
669
670 if (offset > 0) {
671 struct ipv6_tlv_tnl_enc_lim *tel;
672
673 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
674 if (tel->encap_limit == 0) {
675 icmpv6_ndo_send(skb, ICMPV6_PARAMPROB,
676 ICMPV6_HDR_FIELD, offset + 2);
677 return -1;
678 }
679 *encap_limit = tel->encap_limit - 1;
680 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
681 *encap_limit = t->parms.encap_limit;
682 }
683
684 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
685
686 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
687 *dsfield = ipv6_get_dsfield(ipv6h);
688 else
689 *dsfield = ip6_tclass(t->parms.flowinfo);
690
691 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
692 fl6->flowlabel |= ip6_flowlabel(ipv6h);
693
694 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
695 fl6->flowi6_mark = skb->mark;
696 else
697 fl6->flowi6_mark = t->parms.fwmark;
698
699 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
700
701 return 0;
702}
703
704static struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb)
705{
706 struct ip_tunnel_info *tun_info;
707
708 tun_info = skb_tunnel_info(skb);
709 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX)))
710 return ERR_PTR(-EINVAL);
711
712 return tun_info;
713}
714
715static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
716 struct net_device *dev, __u8 dsfield,
717 struct flowi6 *fl6, int encap_limit,
718 __u32 *pmtu, __be16 proto)
719{
720 struct ip6_tnl *tunnel = netdev_priv(dev);
721 __be16 protocol;
722 __be16 flags;
723
724 if (dev->type == ARPHRD_ETHER)
725 IPCB(skb)->flags = 0;
726
727 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
728 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
729 else
730 fl6->daddr = tunnel->parms.raddr;
731
732
733 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
734
735 if (tunnel->parms.collect_md) {
736 struct ip_tunnel_info *tun_info;
737 const struct ip_tunnel_key *key;
738 int tun_hlen;
739
740 tun_info = skb_tunnel_info_txcheck(skb);
741 if (IS_ERR(tun_info) ||
742 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
743 return -EINVAL;
744
745 key = &tun_info->key;
746 memset(fl6, 0, sizeof(*fl6));
747 fl6->flowi6_proto = IPPROTO_GRE;
748 fl6->daddr = key->u.ipv6.dst;
749 fl6->flowlabel = key->label;
750 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
751 fl6->fl6_gre_key = tunnel_id_to_key32(key->tun_id);
752
753 dsfield = key->tos;
754 flags = key->tun_flags &
755 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
756 tun_hlen = gre_calc_hlen(flags);
757
758 if (skb_cow_head(skb, dev->needed_headroom ?: tun_hlen + tunnel->encap_hlen))
759 return -ENOMEM;
760
761 gre_build_header(skb, tun_hlen,
762 flags, protocol,
763 tunnel_id_to_key32(tun_info->key.tun_id),
764 (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno))
765 : 0);
766
767 } else {
768 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
769 return -ENOMEM;
770
771 flags = tunnel->parms.o_flags;
772
773 gre_build_header(skb, tunnel->tun_hlen, flags,
774 protocol, tunnel->parms.o_key,
775 (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno))
776 : 0);
777 }
778
779 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
780 NEXTHDR_GRE);
781}
782
783static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
784{
785 struct ip6_tnl *t = netdev_priv(dev);
786 int encap_limit = -1;
787 struct flowi6 fl6;
788 __u8 dsfield = 0;
789 __u32 mtu;
790 int err;
791
792 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
793
794 if (!t->parms.collect_md)
795 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
796 &dsfield, &encap_limit);
797
798 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
799 if (err)
800 return -1;
801
802 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
803 skb->protocol);
804 if (err != 0) {
805
806 if (err == -EMSGSIZE)
807 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
808 htonl(mtu));
809 return -1;
810 }
811
812 return 0;
813}
814
815static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
816{
817 struct ip6_tnl *t = netdev_priv(dev);
818 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
819 int encap_limit = -1;
820 struct flowi6 fl6;
821 __u8 dsfield = 0;
822 __u32 mtu;
823 int err;
824
825 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
826 return -1;
827
828 if (!t->parms.collect_md &&
829 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
830 return -1;
831
832 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
833 return -1;
834
835 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
836 &mtu, skb->protocol);
837 if (err != 0) {
838 if (err == -EMSGSIZE)
839 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
840 return -1;
841 }
842
843 return 0;
844}
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
861 const struct ipv6hdr *hdr)
862{
863 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
864}
865
866static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
867{
868 struct ip6_tnl *t = netdev_priv(dev);
869 int encap_limit = -1;
870 struct flowi6 fl6;
871 __u32 mtu;
872 int err;
873
874 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
875 encap_limit = t->parms.encap_limit;
876
877 if (!t->parms.collect_md)
878 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
879
880 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
881 if (err)
882 return err;
883
884 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
885
886 return err;
887}
888
889static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
890 struct net_device *dev)
891{
892 struct ip6_tnl *t = netdev_priv(dev);
893 struct net_device_stats *stats = &t->dev->stats;
894 int ret;
895
896 if (!pskb_inet_may_pull(skb))
897 goto tx_err;
898
899 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
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
919tx_err:
920 if (!t->parms.collect_md || !IS_ERR(skb_tunnel_info_txcheck(skb)))
921 stats->tx_errors++;
922 stats->tx_dropped++;
923 kfree_skb(skb);
924 return NETDEV_TX_OK;
925}
926
927static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
928 struct net_device *dev)
929{
930 struct ip_tunnel_info *tun_info = NULL;
931 struct ip6_tnl *t = netdev_priv(dev);
932 struct dst_entry *dst = skb_dst(skb);
933 struct net_device_stats *stats;
934 bool truncate = false;
935 int encap_limit = -1;
936 __u8 dsfield = false;
937 struct flowi6 fl6;
938 int err = -EINVAL;
939 __be16 proto;
940 __u32 mtu;
941 int nhoff;
942
943 if (!pskb_inet_may_pull(skb))
944 goto tx_err;
945
946 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
947 goto tx_err;
948
949 if (gre_handle_offloads(skb, false))
950 goto tx_err;
951
952 if (skb->len > dev->mtu + dev->hard_header_len) {
953 pskb_trim(skb, dev->mtu + dev->hard_header_len);
954 truncate = true;
955 }
956
957 nhoff = skb_network_header(skb) - skb_mac_header(skb);
958 if (skb->protocol == htons(ETH_P_IP) &&
959 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
960 truncate = true;
961
962 if (skb->protocol == htons(ETH_P_IPV6)) {
963 int thoff;
964
965 if (skb_transport_header_was_set(skb))
966 thoff = skb_transport_header(skb) - skb_mac_header(skb);
967 else
968 thoff = nhoff + sizeof(struct ipv6hdr);
969 if (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)
970 truncate = true;
971 }
972
973 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
974 goto tx_err;
975
976 t->parms.o_flags &= ~TUNNEL_KEY;
977 IPCB(skb)->flags = 0;
978
979
980
981
982 if (t->parms.collect_md) {
983 const struct ip_tunnel_key *key;
984 struct erspan_metadata *md;
985 __be32 tun_id;
986
987 tun_info = skb_tunnel_info_txcheck(skb);
988 if (IS_ERR(tun_info) ||
989 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
990 goto tx_err;
991
992 key = &tun_info->key;
993 memset(&fl6, 0, sizeof(fl6));
994 fl6.flowi6_proto = IPPROTO_GRE;
995 fl6.daddr = key->u.ipv6.dst;
996 fl6.flowlabel = key->label;
997 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
998 fl6.fl6_gre_key = tunnel_id_to_key32(key->tun_id);
999
1000 dsfield = key->tos;
1001 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
1002 goto tx_err;
1003 if (tun_info->options_len < sizeof(*md))
1004 goto tx_err;
1005 md = ip_tunnel_info_opts(tun_info);
1006
1007 tun_id = tunnel_id_to_key32(key->tun_id);
1008 if (md->version == 1) {
1009 erspan_build_header(skb,
1010 ntohl(tun_id),
1011 ntohl(md->u.index), truncate,
1012 false);
1013 } else if (md->version == 2) {
1014 erspan_build_header_v2(skb,
1015 ntohl(tun_id),
1016 md->u.md2.dir,
1017 get_hwid(&md->u.md2),
1018 truncate, false);
1019 } else {
1020 goto tx_err;
1021 }
1022 } else {
1023 switch (skb->protocol) {
1024 case htons(ETH_P_IP):
1025 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1026 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1027 &dsfield, &encap_limit);
1028 break;
1029 case htons(ETH_P_IPV6):
1030 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1031 goto tx_err;
1032 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1033 &dsfield, &encap_limit))
1034 goto tx_err;
1035 break;
1036 default:
1037 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1038 break;
1039 }
1040
1041 if (t->parms.erspan_ver == 1)
1042 erspan_build_header(skb, ntohl(t->parms.o_key),
1043 t->parms.index,
1044 truncate, false);
1045 else if (t->parms.erspan_ver == 2)
1046 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1047 t->parms.dir,
1048 t->parms.hwid,
1049 truncate, false);
1050 else
1051 goto tx_err;
1052
1053 fl6.daddr = t->parms.raddr;
1054 }
1055
1056
1057 proto = (t->parms.erspan_ver == 1) ? htons(ETH_P_ERSPAN)
1058 : htons(ETH_P_ERSPAN2);
1059 gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(atomic_fetch_inc(&t->o_seqno)));
1060
1061
1062 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1063 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false);
1064
1065 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1066 NEXTHDR_GRE);
1067 if (err != 0) {
1068
1069 if (err == -EMSGSIZE) {
1070 if (skb->protocol == htons(ETH_P_IP))
1071 icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1072 ICMP_FRAG_NEEDED, htonl(mtu));
1073 else
1074 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1075 }
1076
1077 goto tx_err;
1078 }
1079 return NETDEV_TX_OK;
1080
1081tx_err:
1082 stats = &t->dev->stats;
1083 if (!IS_ERR(tun_info))
1084 stats->tx_errors++;
1085 stats->tx_dropped++;
1086 kfree_skb(skb);
1087 return NETDEV_TX_OK;
1088}
1089
1090static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1091{
1092 struct net_device *dev = t->dev;
1093 struct __ip6_tnl_parm *p = &t->parms;
1094 struct flowi6 *fl6 = &t->fl.u.ip6;
1095
1096 if (dev->type != ARPHRD_ETHER) {
1097 __dev_addr_set(dev, &p->laddr, sizeof(struct in6_addr));
1098 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1099 }
1100
1101
1102 fl6->saddr = p->laddr;
1103 fl6->daddr = p->raddr;
1104 fl6->flowi6_oif = p->link;
1105 fl6->flowlabel = 0;
1106 fl6->flowi6_proto = IPPROTO_GRE;
1107 fl6->fl6_gre_key = t->parms.o_key;
1108
1109 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1110 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1111 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1112 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1113
1114 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1115 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1116
1117 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1118 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1119 dev->flags |= IFF_POINTOPOINT;
1120 else
1121 dev->flags &= ~IFF_POINTOPOINT;
1122}
1123
1124static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1125 int t_hlen)
1126{
1127 const struct __ip6_tnl_parm *p = &t->parms;
1128 struct net_device *dev = t->dev;
1129
1130 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1131 int strict = (ipv6_addr_type(&p->raddr) &
1132 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1133
1134 struct rt6_info *rt = rt6_lookup(t->net,
1135 &p->raddr, &p->laddr,
1136 p->link, NULL, strict);
1137
1138 if (!rt)
1139 return;
1140
1141 if (rt->dst.dev) {
1142 unsigned short dst_len = rt->dst.dev->hard_header_len +
1143 t_hlen;
1144
1145 if (t->dev->header_ops)
1146 dev->hard_header_len = dst_len;
1147 else
1148 dev->needed_headroom = dst_len;
1149
1150 if (set_mtu) {
1151 dev->mtu = rt->dst.dev->mtu - t_hlen;
1152 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1153 dev->mtu -= 8;
1154 if (dev->type == ARPHRD_ETHER)
1155 dev->mtu -= ETH_HLEN;
1156
1157 if (dev->mtu < IPV6_MIN_MTU)
1158 dev->mtu = IPV6_MIN_MTU;
1159 }
1160 }
1161 ip6_rt_put(rt);
1162 }
1163}
1164
1165static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1166{
1167 int t_hlen;
1168
1169 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1170 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1171
1172 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1173
1174 if (tunnel->dev->header_ops)
1175 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1176 else
1177 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1178
1179 return t_hlen;
1180}
1181
1182static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1183{
1184 ip6gre_tnl_link_config_common(t);
1185 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1186}
1187
1188static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1189 const struct __ip6_tnl_parm *p)
1190{
1191 t->parms.laddr = p->laddr;
1192 t->parms.raddr = p->raddr;
1193 t->parms.flags = p->flags;
1194 t->parms.hop_limit = p->hop_limit;
1195 t->parms.encap_limit = p->encap_limit;
1196 t->parms.flowinfo = p->flowinfo;
1197 t->parms.link = p->link;
1198 t->parms.proto = p->proto;
1199 t->parms.i_key = p->i_key;
1200 t->parms.o_key = p->o_key;
1201 t->parms.i_flags = p->i_flags;
1202 t->parms.o_flags = p->o_flags;
1203 t->parms.fwmark = p->fwmark;
1204 t->parms.erspan_ver = p->erspan_ver;
1205 t->parms.index = p->index;
1206 t->parms.dir = p->dir;
1207 t->parms.hwid = p->hwid;
1208 dst_cache_reset(&t->dst_cache);
1209}
1210
1211static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1212 int set_mtu)
1213{
1214 ip6gre_tnl_copy_tnl_parm(t, p);
1215 ip6gre_tnl_link_config(t, set_mtu);
1216 return 0;
1217}
1218
1219static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1220 const struct ip6_tnl_parm2 *u)
1221{
1222 p->laddr = u->laddr;
1223 p->raddr = u->raddr;
1224 p->flags = u->flags;
1225 p->hop_limit = u->hop_limit;
1226 p->encap_limit = u->encap_limit;
1227 p->flowinfo = u->flowinfo;
1228 p->link = u->link;
1229 p->i_key = u->i_key;
1230 p->o_key = u->o_key;
1231 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1232 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1233 memcpy(p->name, u->name, sizeof(u->name));
1234}
1235
1236static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1237 const struct __ip6_tnl_parm *p)
1238{
1239 u->proto = IPPROTO_GRE;
1240 u->laddr = p->laddr;
1241 u->raddr = p->raddr;
1242 u->flags = p->flags;
1243 u->hop_limit = p->hop_limit;
1244 u->encap_limit = p->encap_limit;
1245 u->flowinfo = p->flowinfo;
1246 u->link = p->link;
1247 u->i_key = p->i_key;
1248 u->o_key = p->o_key;
1249 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1250 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1251 memcpy(u->name, p->name, sizeof(u->name));
1252}
1253
1254static int ip6gre_tunnel_siocdevprivate(struct net_device *dev,
1255 struct ifreq *ifr, void __user *data,
1256 int cmd)
1257{
1258 int err = 0;
1259 struct ip6_tnl_parm2 p;
1260 struct __ip6_tnl_parm p1;
1261 struct ip6_tnl *t = netdev_priv(dev);
1262 struct net *net = t->net;
1263 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1264
1265 memset(&p1, 0, sizeof(p1));
1266
1267 switch (cmd) {
1268 case SIOCGETTUNNEL:
1269 if (dev == ign->fb_tunnel_dev) {
1270 if (copy_from_user(&p, data, sizeof(p))) {
1271 err = -EFAULT;
1272 break;
1273 }
1274 ip6gre_tnl_parm_from_user(&p1, &p);
1275 t = ip6gre_tunnel_locate(net, &p1, 0);
1276 if (!t)
1277 t = netdev_priv(dev);
1278 }
1279 memset(&p, 0, sizeof(p));
1280 ip6gre_tnl_parm_to_user(&p, &t->parms);
1281 if (copy_to_user(data, &p, sizeof(p)))
1282 err = -EFAULT;
1283 break;
1284
1285 case SIOCADDTUNNEL:
1286 case SIOCCHGTUNNEL:
1287 err = -EPERM;
1288 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1289 goto done;
1290
1291 err = -EFAULT;
1292 if (copy_from_user(&p, data, sizeof(p)))
1293 goto done;
1294
1295 err = -EINVAL;
1296 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1297 goto done;
1298
1299 if (!(p.i_flags&GRE_KEY))
1300 p.i_key = 0;
1301 if (!(p.o_flags&GRE_KEY))
1302 p.o_key = 0;
1303
1304 ip6gre_tnl_parm_from_user(&p1, &p);
1305 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1306
1307 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1308 if (t) {
1309 if (t->dev != dev) {
1310 err = -EEXIST;
1311 break;
1312 }
1313 } else {
1314 t = netdev_priv(dev);
1315
1316 ip6gre_tunnel_unlink(ign, t);
1317 synchronize_net();
1318 ip6gre_tnl_change(t, &p1, 1);
1319 ip6gre_tunnel_link(ign, t);
1320 netdev_state_change(dev);
1321 }
1322 }
1323
1324 if (t) {
1325 err = 0;
1326
1327 memset(&p, 0, sizeof(p));
1328 ip6gre_tnl_parm_to_user(&p, &t->parms);
1329 if (copy_to_user(data, &p, sizeof(p)))
1330 err = -EFAULT;
1331 } else
1332 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1333 break;
1334
1335 case SIOCDELTUNNEL:
1336 err = -EPERM;
1337 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1338 goto done;
1339
1340 if (dev == ign->fb_tunnel_dev) {
1341 err = -EFAULT;
1342 if (copy_from_user(&p, data, sizeof(p)))
1343 goto done;
1344 err = -ENOENT;
1345 ip6gre_tnl_parm_from_user(&p1, &p);
1346 t = ip6gre_tunnel_locate(net, &p1, 0);
1347 if (!t)
1348 goto done;
1349 err = -EPERM;
1350 if (t == netdev_priv(ign->fb_tunnel_dev))
1351 goto done;
1352 dev = t->dev;
1353 }
1354 unregister_netdevice(dev);
1355 err = 0;
1356 break;
1357
1358 default:
1359 err = -EINVAL;
1360 }
1361
1362done:
1363 return err;
1364}
1365
1366static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1367 unsigned short type, const void *daddr,
1368 const void *saddr, unsigned int len)
1369{
1370 struct ip6_tnl *t = netdev_priv(dev);
1371 struct ipv6hdr *ipv6h;
1372 __be16 *p;
1373
1374 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1375 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1376 t->fl.u.ip6.flowlabel,
1377 true, &t->fl.u.ip6));
1378 ipv6h->hop_limit = t->parms.hop_limit;
1379 ipv6h->nexthdr = NEXTHDR_GRE;
1380 ipv6h->saddr = t->parms.laddr;
1381 ipv6h->daddr = t->parms.raddr;
1382
1383 p = (__be16 *)(ipv6h + 1);
1384 p[0] = t->parms.o_flags;
1385 p[1] = htons(type);
1386
1387
1388
1389
1390
1391 if (saddr)
1392 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1393 if (daddr)
1394 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1395 if (!ipv6_addr_any(&ipv6h->daddr))
1396 return t->hlen;
1397
1398 return -t->hlen;
1399}
1400
1401static const struct header_ops ip6gre_header_ops = {
1402 .create = ip6gre_header,
1403};
1404
1405static const struct net_device_ops ip6gre_netdev_ops = {
1406 .ndo_init = ip6gre_tunnel_init,
1407 .ndo_uninit = ip6gre_tunnel_uninit,
1408 .ndo_start_xmit = ip6gre_tunnel_xmit,
1409 .ndo_siocdevprivate = ip6gre_tunnel_siocdevprivate,
1410 .ndo_change_mtu = ip6_tnl_change_mtu,
1411 .ndo_get_stats64 = dev_get_tstats64,
1412 .ndo_get_iflink = ip6_tnl_get_iflink,
1413};
1414
1415static void ip6gre_dev_free(struct net_device *dev)
1416{
1417 struct ip6_tnl *t = netdev_priv(dev);
1418
1419 gro_cells_destroy(&t->gro_cells);
1420 dst_cache_destroy(&t->dst_cache);
1421 free_percpu(dev->tstats);
1422}
1423
1424static void ip6gre_tunnel_setup(struct net_device *dev)
1425{
1426 dev->netdev_ops = &ip6gre_netdev_ops;
1427 dev->needs_free_netdev = true;
1428 dev->priv_destructor = ip6gre_dev_free;
1429
1430 dev->type = ARPHRD_IP6GRE;
1431
1432 dev->flags |= IFF_NOARP;
1433 dev->addr_len = sizeof(struct in6_addr);
1434 netif_keep_dst(dev);
1435
1436 dev->addr_assign_type = NET_ADDR_RANDOM;
1437 eth_random_addr(dev->perm_addr);
1438}
1439
1440#define GRE6_FEATURES (NETIF_F_SG | \
1441 NETIF_F_FRAGLIST | \
1442 NETIF_F_HIGHDMA | \
1443 NETIF_F_HW_CSUM)
1444
1445static void ip6gre_tnl_init_features(struct net_device *dev)
1446{
1447 struct ip6_tnl *nt = netdev_priv(dev);
1448 __be16 flags;
1449
1450 dev->features |= GRE6_FEATURES | NETIF_F_LLTX;
1451 dev->hw_features |= GRE6_FEATURES;
1452
1453 flags = nt->parms.o_flags;
1454
1455
1456
1457
1458 if (flags & TUNNEL_SEQ)
1459 return;
1460 if (flags & TUNNEL_CSUM && nt->encap.type != TUNNEL_ENCAP_NONE)
1461 return;
1462
1463 dev->features |= NETIF_F_GSO_SOFTWARE;
1464 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1465}
1466
1467static int ip6gre_tunnel_init_common(struct net_device *dev)
1468{
1469 struct ip6_tnl *tunnel;
1470 int ret;
1471 int t_hlen;
1472
1473 tunnel = netdev_priv(dev);
1474
1475 tunnel->dev = dev;
1476 tunnel->net = dev_net(dev);
1477 strcpy(tunnel->parms.name, dev->name);
1478
1479 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1480 if (!dev->tstats)
1481 return -ENOMEM;
1482
1483 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1484 if (ret)
1485 goto cleanup_alloc_pcpu_stats;
1486
1487 ret = gro_cells_init(&tunnel->gro_cells, dev);
1488 if (ret)
1489 goto cleanup_dst_cache_init;
1490
1491 t_hlen = ip6gre_calc_hlen(tunnel);
1492 dev->mtu = ETH_DATA_LEN - t_hlen;
1493 if (dev->type == ARPHRD_ETHER)
1494 dev->mtu -= ETH_HLEN;
1495 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1496 dev->mtu -= 8;
1497
1498 if (tunnel->parms.collect_md) {
1499 netif_keep_dst(dev);
1500 }
1501 ip6gre_tnl_init_features(dev);
1502
1503 dev_hold_track(dev, &tunnel->dev_tracker, GFP_KERNEL);
1504 return 0;
1505
1506cleanup_dst_cache_init:
1507 dst_cache_destroy(&tunnel->dst_cache);
1508cleanup_alloc_pcpu_stats:
1509 free_percpu(dev->tstats);
1510 dev->tstats = NULL;
1511 return ret;
1512}
1513
1514static int ip6gre_tunnel_init(struct net_device *dev)
1515{
1516 struct ip6_tnl *tunnel;
1517 int ret;
1518
1519 ret = ip6gre_tunnel_init_common(dev);
1520 if (ret)
1521 return ret;
1522
1523 tunnel = netdev_priv(dev);
1524
1525 if (tunnel->parms.collect_md)
1526 return 0;
1527
1528 __dev_addr_set(dev, &tunnel->parms.laddr, sizeof(struct in6_addr));
1529 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1530
1531 if (ipv6_addr_any(&tunnel->parms.raddr))
1532 dev->header_ops = &ip6gre_header_ops;
1533
1534 return 0;
1535}
1536
1537static void ip6gre_fb_tunnel_init(struct net_device *dev)
1538{
1539 struct ip6_tnl *tunnel = netdev_priv(dev);
1540
1541 tunnel->dev = dev;
1542 tunnel->net = dev_net(dev);
1543 strcpy(tunnel->parms.name, dev->name);
1544
1545 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1546}
1547
1548static struct inet6_protocol ip6gre_protocol __read_mostly = {
1549 .handler = gre_rcv,
1550 .err_handler = ip6gre_err,
1551 .flags = INET6_PROTO_FINAL,
1552};
1553
1554static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1555{
1556 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1557 struct net_device *dev, *aux;
1558 int prio;
1559
1560 for_each_netdev_safe(net, dev, aux)
1561 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1562 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1563 dev->rtnl_link_ops == &ip6erspan_tap_ops)
1564 unregister_netdevice_queue(dev, head);
1565
1566 for (prio = 0; prio < 4; prio++) {
1567 int h;
1568 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1569 struct ip6_tnl *t;
1570
1571 t = rtnl_dereference(ign->tunnels[prio][h]);
1572
1573 while (t) {
1574
1575
1576
1577 if (!net_eq(dev_net(t->dev), net))
1578 unregister_netdevice_queue(t->dev,
1579 head);
1580 t = rtnl_dereference(t->next);
1581 }
1582 }
1583 }
1584}
1585
1586static int __net_init ip6gre_init_net(struct net *net)
1587{
1588 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1589 struct net_device *ndev;
1590 int err;
1591
1592 if (!net_has_fallback_tunnels(net))
1593 return 0;
1594 ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1595 NET_NAME_UNKNOWN, ip6gre_tunnel_setup);
1596 if (!ndev) {
1597 err = -ENOMEM;
1598 goto err_alloc_dev;
1599 }
1600 ign->fb_tunnel_dev = ndev;
1601 dev_net_set(ign->fb_tunnel_dev, net);
1602
1603
1604
1605 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1606
1607
1608 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1609 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1610
1611 err = register_netdev(ign->fb_tunnel_dev);
1612 if (err)
1613 goto err_reg_dev;
1614
1615 rcu_assign_pointer(ign->tunnels_wc[0],
1616 netdev_priv(ign->fb_tunnel_dev));
1617 return 0;
1618
1619err_reg_dev:
1620 free_netdev(ndev);
1621err_alloc_dev:
1622 return err;
1623}
1624
1625static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1626{
1627 struct net *net;
1628 LIST_HEAD(list);
1629
1630 rtnl_lock();
1631 list_for_each_entry(net, net_list, exit_list)
1632 ip6gre_destroy_tunnels(net, &list);
1633 unregister_netdevice_many(&list);
1634 rtnl_unlock();
1635}
1636
1637static struct pernet_operations ip6gre_net_ops = {
1638 .init = ip6gre_init_net,
1639 .exit_batch = ip6gre_exit_batch_net,
1640 .id = &ip6gre_net_id,
1641 .size = sizeof(struct ip6gre_net),
1642};
1643
1644static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1645 struct netlink_ext_ack *extack)
1646{
1647 __be16 flags;
1648
1649 if (!data)
1650 return 0;
1651
1652 flags = 0;
1653 if (data[IFLA_GRE_IFLAGS])
1654 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1655 if (data[IFLA_GRE_OFLAGS])
1656 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1657 if (flags & (GRE_VERSION|GRE_ROUTING))
1658 return -EINVAL;
1659
1660 return 0;
1661}
1662
1663static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1664 struct netlink_ext_ack *extack)
1665{
1666 struct in6_addr daddr;
1667
1668 if (tb[IFLA_ADDRESS]) {
1669 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1670 return -EINVAL;
1671 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1672 return -EADDRNOTAVAIL;
1673 }
1674
1675 if (!data)
1676 goto out;
1677
1678 if (data[IFLA_GRE_REMOTE]) {
1679 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1680 if (ipv6_addr_any(&daddr))
1681 return -EINVAL;
1682 }
1683
1684out:
1685 return ip6gre_tunnel_validate(tb, data, extack);
1686}
1687
1688static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1689 struct netlink_ext_ack *extack)
1690{
1691 __be16 flags = 0;
1692 int ret, ver = 0;
1693
1694 if (!data)
1695 return 0;
1696
1697 ret = ip6gre_tap_validate(tb, data, extack);
1698 if (ret)
1699 return ret;
1700
1701
1702 if (data[IFLA_GRE_OFLAGS])
1703 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1704 if (data[IFLA_GRE_IFLAGS])
1705 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1706 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1707 flags != (GRE_SEQ | GRE_KEY))
1708 return -EINVAL;
1709
1710
1711
1712
1713 if (data[IFLA_GRE_IKEY] &&
1714 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1715 return -EINVAL;
1716
1717 if (data[IFLA_GRE_OKEY] &&
1718 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1719 return -EINVAL;
1720
1721 if (data[IFLA_GRE_ERSPAN_VER]) {
1722 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1723 if (ver != 1 && ver != 2)
1724 return -EINVAL;
1725 }
1726
1727 if (ver == 1) {
1728 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1729 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1730
1731 if (index & ~INDEX_MASK)
1732 return -EINVAL;
1733 }
1734 } else if (ver == 2) {
1735 if (data[IFLA_GRE_ERSPAN_DIR]) {
1736 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1737
1738 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1739 return -EINVAL;
1740 }
1741
1742 if (data[IFLA_GRE_ERSPAN_HWID]) {
1743 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1744
1745 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1746 return -EINVAL;
1747 }
1748 }
1749
1750 return 0;
1751}
1752
1753static void ip6erspan_set_version(struct nlattr *data[],
1754 struct __ip6_tnl_parm *parms)
1755{
1756 if (!data)
1757 return;
1758
1759 parms->erspan_ver = 1;
1760 if (data[IFLA_GRE_ERSPAN_VER])
1761 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1762
1763 if (parms->erspan_ver == 1) {
1764 if (data[IFLA_GRE_ERSPAN_INDEX])
1765 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1766 } else if (parms->erspan_ver == 2) {
1767 if (data[IFLA_GRE_ERSPAN_DIR])
1768 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1769 if (data[IFLA_GRE_ERSPAN_HWID])
1770 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1771 }
1772}
1773
1774static void ip6gre_netlink_parms(struct nlattr *data[],
1775 struct __ip6_tnl_parm *parms)
1776{
1777 memset(parms, 0, sizeof(*parms));
1778
1779 if (!data)
1780 return;
1781
1782 if (data[IFLA_GRE_LINK])
1783 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1784
1785 if (data[IFLA_GRE_IFLAGS])
1786 parms->i_flags = gre_flags_to_tnl_flags(
1787 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1788
1789 if (data[IFLA_GRE_OFLAGS])
1790 parms->o_flags = gre_flags_to_tnl_flags(
1791 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1792
1793 if (data[IFLA_GRE_IKEY])
1794 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1795
1796 if (data[IFLA_GRE_OKEY])
1797 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1798
1799 if (data[IFLA_GRE_LOCAL])
1800 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1801
1802 if (data[IFLA_GRE_REMOTE])
1803 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1804
1805 if (data[IFLA_GRE_TTL])
1806 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1807
1808 if (data[IFLA_GRE_ENCAP_LIMIT])
1809 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1810
1811 if (data[IFLA_GRE_FLOWINFO])
1812 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1813
1814 if (data[IFLA_GRE_FLAGS])
1815 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1816
1817 if (data[IFLA_GRE_FWMARK])
1818 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1819
1820 if (data[IFLA_GRE_COLLECT_METADATA])
1821 parms->collect_md = true;
1822}
1823
1824static int ip6gre_tap_init(struct net_device *dev)
1825{
1826 int ret;
1827
1828 ret = ip6gre_tunnel_init_common(dev);
1829 if (ret)
1830 return ret;
1831
1832 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1833
1834 return 0;
1835}
1836
1837static const struct net_device_ops ip6gre_tap_netdev_ops = {
1838 .ndo_init = ip6gre_tap_init,
1839 .ndo_uninit = ip6gre_tunnel_uninit,
1840 .ndo_start_xmit = ip6gre_tunnel_xmit,
1841 .ndo_set_mac_address = eth_mac_addr,
1842 .ndo_validate_addr = eth_validate_addr,
1843 .ndo_change_mtu = ip6_tnl_change_mtu,
1844 .ndo_get_stats64 = dev_get_tstats64,
1845 .ndo_get_iflink = ip6_tnl_get_iflink,
1846};
1847
1848static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1849{
1850 int t_hlen;
1851
1852 tunnel->tun_hlen = 8;
1853 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1854 erspan_hdr_len(tunnel->parms.erspan_ver);
1855
1856 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1857 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1858 return t_hlen;
1859}
1860
1861static int ip6erspan_tap_init(struct net_device *dev)
1862{
1863 struct ip6_tnl *tunnel;
1864 int t_hlen;
1865 int ret;
1866
1867 tunnel = netdev_priv(dev);
1868
1869 tunnel->dev = dev;
1870 tunnel->net = dev_net(dev);
1871 strcpy(tunnel->parms.name, dev->name);
1872
1873 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1874 if (!dev->tstats)
1875 return -ENOMEM;
1876
1877 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1878 if (ret)
1879 goto cleanup_alloc_pcpu_stats;
1880
1881 ret = gro_cells_init(&tunnel->gro_cells, dev);
1882 if (ret)
1883 goto cleanup_dst_cache_init;
1884
1885 t_hlen = ip6erspan_calc_hlen(tunnel);
1886 dev->mtu = ETH_DATA_LEN - t_hlen;
1887 if (dev->type == ARPHRD_ETHER)
1888 dev->mtu -= ETH_HLEN;
1889 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1890 dev->mtu -= 8;
1891
1892 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1893 ip6erspan_tnl_link_config(tunnel, 1);
1894
1895 dev_hold_track(dev, &tunnel->dev_tracker, GFP_KERNEL);
1896 return 0;
1897
1898cleanup_dst_cache_init:
1899 dst_cache_destroy(&tunnel->dst_cache);
1900cleanup_alloc_pcpu_stats:
1901 free_percpu(dev->tstats);
1902 dev->tstats = NULL;
1903 return ret;
1904}
1905
1906static const struct net_device_ops ip6erspan_netdev_ops = {
1907 .ndo_init = ip6erspan_tap_init,
1908 .ndo_uninit = ip6erspan_tunnel_uninit,
1909 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1910 .ndo_set_mac_address = eth_mac_addr,
1911 .ndo_validate_addr = eth_validate_addr,
1912 .ndo_change_mtu = ip6_tnl_change_mtu,
1913 .ndo_get_stats64 = dev_get_tstats64,
1914 .ndo_get_iflink = ip6_tnl_get_iflink,
1915};
1916
1917static void ip6gre_tap_setup(struct net_device *dev)
1918{
1919
1920 ether_setup(dev);
1921
1922 dev->max_mtu = 0;
1923 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1924 dev->needs_free_netdev = true;
1925 dev->priv_destructor = ip6gre_dev_free;
1926
1927 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1928 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1929 netif_keep_dst(dev);
1930}
1931
1932static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1933 struct ip_tunnel_encap *ipencap)
1934{
1935 bool ret = false;
1936
1937 memset(ipencap, 0, sizeof(*ipencap));
1938
1939 if (!data)
1940 return ret;
1941
1942 if (data[IFLA_GRE_ENCAP_TYPE]) {
1943 ret = true;
1944 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1945 }
1946
1947 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1948 ret = true;
1949 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1950 }
1951
1952 if (data[IFLA_GRE_ENCAP_SPORT]) {
1953 ret = true;
1954 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1955 }
1956
1957 if (data[IFLA_GRE_ENCAP_DPORT]) {
1958 ret = true;
1959 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1960 }
1961
1962 return ret;
1963}
1964
1965static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1966 struct nlattr *tb[], struct nlattr *data[],
1967 struct netlink_ext_ack *extack)
1968{
1969 struct ip6_tnl *nt;
1970 struct ip_tunnel_encap ipencap;
1971 int err;
1972
1973 nt = netdev_priv(dev);
1974
1975 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1976 int err = ip6_tnl_encap_setup(nt, &ipencap);
1977
1978 if (err < 0)
1979 return err;
1980 }
1981
1982 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1983 eth_hw_addr_random(dev);
1984
1985 nt->dev = dev;
1986 nt->net = dev_net(dev);
1987
1988 err = register_netdevice(dev);
1989 if (err)
1990 goto out;
1991
1992 if (tb[IFLA_MTU])
1993 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1994
1995out:
1996 return err;
1997}
1998
1999static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
2000 struct nlattr *tb[], struct nlattr *data[],
2001 struct netlink_ext_ack *extack)
2002{
2003 struct ip6_tnl *nt = netdev_priv(dev);
2004 struct net *net = dev_net(dev);
2005 struct ip6gre_net *ign;
2006 int err;
2007
2008 ip6gre_netlink_parms(data, &nt->parms);
2009 ign = net_generic(net, ip6gre_net_id);
2010
2011 if (nt->parms.collect_md) {
2012 if (rtnl_dereference(ign->collect_md_tun))
2013 return -EEXIST;
2014 } else {
2015 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2016 return -EEXIST;
2017 }
2018
2019 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2020 if (!err) {
2021 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
2022 ip6gre_tunnel_link_md(ign, nt);
2023 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2024 }
2025 return err;
2026}
2027
2028static struct ip6_tnl *
2029ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2030 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2031 struct netlink_ext_ack *extack)
2032{
2033 struct ip6_tnl *t, *nt = netdev_priv(dev);
2034 struct net *net = nt->net;
2035 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2036 struct ip_tunnel_encap ipencap;
2037
2038 if (dev == ign->fb_tunnel_dev)
2039 return ERR_PTR(-EINVAL);
2040
2041 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2042 int err = ip6_tnl_encap_setup(nt, &ipencap);
2043
2044 if (err < 0)
2045 return ERR_PTR(err);
2046 }
2047
2048 ip6gre_netlink_parms(data, p_p);
2049
2050 t = ip6gre_tunnel_locate(net, p_p, 0);
2051
2052 if (t) {
2053 if (t->dev != dev)
2054 return ERR_PTR(-EEXIST);
2055 } else {
2056 t = nt;
2057 }
2058
2059 return t;
2060}
2061
2062static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2063 struct nlattr *data[],
2064 struct netlink_ext_ack *extack)
2065{
2066 struct ip6_tnl *t = netdev_priv(dev);
2067 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2068 struct __ip6_tnl_parm p;
2069
2070 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2071 if (IS_ERR(t))
2072 return PTR_ERR(t);
2073
2074 ip6gre_tunnel_unlink_md(ign, t);
2075 ip6gre_tunnel_unlink(ign, t);
2076 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2077 ip6gre_tunnel_link_md(ign, t);
2078 ip6gre_tunnel_link(ign, t);
2079 return 0;
2080}
2081
2082static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2083{
2084 struct net *net = dev_net(dev);
2085 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2086
2087 if (dev != ign->fb_tunnel_dev)
2088 unregister_netdevice_queue(dev, head);
2089}
2090
2091static size_t ip6gre_get_size(const struct net_device *dev)
2092{
2093 return
2094
2095 nla_total_size(4) +
2096
2097 nla_total_size(2) +
2098
2099 nla_total_size(2) +
2100
2101 nla_total_size(4) +
2102
2103 nla_total_size(4) +
2104
2105 nla_total_size(sizeof(struct in6_addr)) +
2106
2107 nla_total_size(sizeof(struct in6_addr)) +
2108
2109 nla_total_size(1) +
2110
2111 nla_total_size(1) +
2112
2113 nla_total_size(4) +
2114
2115 nla_total_size(4) +
2116
2117 nla_total_size(2) +
2118
2119 nla_total_size(2) +
2120
2121 nla_total_size(2) +
2122
2123 nla_total_size(2) +
2124
2125 nla_total_size(0) +
2126
2127 nla_total_size(4) +
2128
2129 nla_total_size(4) +
2130 0;
2131}
2132
2133static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2134{
2135 struct ip6_tnl *t = netdev_priv(dev);
2136 struct __ip6_tnl_parm *p = &t->parms;
2137 __be16 o_flags = p->o_flags;
2138
2139 if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2140 if (!p->collect_md)
2141 o_flags |= TUNNEL_KEY;
2142
2143 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2144 goto nla_put_failure;
2145
2146 if (p->erspan_ver == 1) {
2147 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2148 goto nla_put_failure;
2149 } else {
2150 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2151 goto nla_put_failure;
2152 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2153 goto nla_put_failure;
2154 }
2155 }
2156
2157 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2158 nla_put_be16(skb, IFLA_GRE_IFLAGS,
2159 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2160 nla_put_be16(skb, IFLA_GRE_OFLAGS,
2161 gre_tnl_flags_to_gre_flags(o_flags)) ||
2162 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2163 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2164 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2165 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2166 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2167 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2168 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2169 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2170 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
2171 goto nla_put_failure;
2172
2173 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2174 t->encap.type) ||
2175 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2176 t->encap.sport) ||
2177 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2178 t->encap.dport) ||
2179 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2180 t->encap.flags))
2181 goto nla_put_failure;
2182
2183 if (p->collect_md) {
2184 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2185 goto nla_put_failure;
2186 }
2187
2188 return 0;
2189
2190nla_put_failure:
2191 return -EMSGSIZE;
2192}
2193
2194static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2195 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2196 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2197 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2198 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2199 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2200 [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct ipv6hdr, saddr) },
2201 [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct ipv6hdr, daddr) },
2202 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2203 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2204 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2205 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
2206 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2207 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2208 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2209 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
2210 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2211 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
2212 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2213 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2214 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2215 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
2216};
2217
2218static void ip6erspan_tap_setup(struct net_device *dev)
2219{
2220 ether_setup(dev);
2221
2222 dev->max_mtu = 0;
2223 dev->netdev_ops = &ip6erspan_netdev_ops;
2224 dev->needs_free_netdev = true;
2225 dev->priv_destructor = ip6gre_dev_free;
2226
2227 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2228 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2229 netif_keep_dst(dev);
2230}
2231
2232static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2233 struct nlattr *tb[], struct nlattr *data[],
2234 struct netlink_ext_ack *extack)
2235{
2236 struct ip6_tnl *nt = netdev_priv(dev);
2237 struct net *net = dev_net(dev);
2238 struct ip6gre_net *ign;
2239 int err;
2240
2241 ip6gre_netlink_parms(data, &nt->parms);
2242 ip6erspan_set_version(data, &nt->parms);
2243 ign = net_generic(net, ip6gre_net_id);
2244
2245 if (nt->parms.collect_md) {
2246 if (rtnl_dereference(ign->collect_md_tun_erspan))
2247 return -EEXIST;
2248 } else {
2249 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2250 return -EEXIST;
2251 }
2252
2253 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2254 if (!err) {
2255 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2256 ip6erspan_tunnel_link_md(ign, nt);
2257 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2258 }
2259 return err;
2260}
2261
2262static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2263{
2264 ip6gre_tnl_link_config_common(t);
2265 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2266}
2267
2268static int ip6erspan_tnl_change(struct ip6_tnl *t,
2269 const struct __ip6_tnl_parm *p, int set_mtu)
2270{
2271 ip6gre_tnl_copy_tnl_parm(t, p);
2272 ip6erspan_tnl_link_config(t, set_mtu);
2273 return 0;
2274}
2275
2276static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2277 struct nlattr *data[],
2278 struct netlink_ext_ack *extack)
2279{
2280 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2281 struct __ip6_tnl_parm p;
2282 struct ip6_tnl *t;
2283
2284 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2285 if (IS_ERR(t))
2286 return PTR_ERR(t);
2287
2288 ip6erspan_set_version(data, &p);
2289 ip6gre_tunnel_unlink_md(ign, t);
2290 ip6gre_tunnel_unlink(ign, t);
2291 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2292 ip6erspan_tunnel_link_md(ign, t);
2293 ip6gre_tunnel_link(ign, t);
2294 return 0;
2295}
2296
2297static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2298 .kind = "ip6gre",
2299 .maxtype = IFLA_GRE_MAX,
2300 .policy = ip6gre_policy,
2301 .priv_size = sizeof(struct ip6_tnl),
2302 .setup = ip6gre_tunnel_setup,
2303 .validate = ip6gre_tunnel_validate,
2304 .newlink = ip6gre_newlink,
2305 .changelink = ip6gre_changelink,
2306 .dellink = ip6gre_dellink,
2307 .get_size = ip6gre_get_size,
2308 .fill_info = ip6gre_fill_info,
2309 .get_link_net = ip6_tnl_get_link_net,
2310};
2311
2312static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2313 .kind = "ip6gretap",
2314 .maxtype = IFLA_GRE_MAX,
2315 .policy = ip6gre_policy,
2316 .priv_size = sizeof(struct ip6_tnl),
2317 .setup = ip6gre_tap_setup,
2318 .validate = ip6gre_tap_validate,
2319 .newlink = ip6gre_newlink,
2320 .changelink = ip6gre_changelink,
2321 .get_size = ip6gre_get_size,
2322 .fill_info = ip6gre_fill_info,
2323 .get_link_net = ip6_tnl_get_link_net,
2324};
2325
2326static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2327 .kind = "ip6erspan",
2328 .maxtype = IFLA_GRE_MAX,
2329 .policy = ip6gre_policy,
2330 .priv_size = sizeof(struct ip6_tnl),
2331 .setup = ip6erspan_tap_setup,
2332 .validate = ip6erspan_tap_validate,
2333 .newlink = ip6erspan_newlink,
2334 .changelink = ip6erspan_changelink,
2335 .get_size = ip6gre_get_size,
2336 .fill_info = ip6gre_fill_info,
2337 .get_link_net = ip6_tnl_get_link_net,
2338};
2339
2340
2341
2342
2343
2344static int __init ip6gre_init(void)
2345{
2346 int err;
2347
2348 pr_info("GRE over IPv6 tunneling driver\n");
2349
2350 err = register_pernet_device(&ip6gre_net_ops);
2351 if (err < 0)
2352 return err;
2353
2354 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2355 if (err < 0) {
2356 pr_info("%s: can't add protocol\n", __func__);
2357 goto add_proto_failed;
2358 }
2359
2360 err = rtnl_link_register(&ip6gre_link_ops);
2361 if (err < 0)
2362 goto rtnl_link_failed;
2363
2364 err = rtnl_link_register(&ip6gre_tap_ops);
2365 if (err < 0)
2366 goto tap_ops_failed;
2367
2368 err = rtnl_link_register(&ip6erspan_tap_ops);
2369 if (err < 0)
2370 goto erspan_link_failed;
2371
2372out:
2373 return err;
2374
2375erspan_link_failed:
2376 rtnl_link_unregister(&ip6gre_tap_ops);
2377tap_ops_failed:
2378 rtnl_link_unregister(&ip6gre_link_ops);
2379rtnl_link_failed:
2380 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2381add_proto_failed:
2382 unregister_pernet_device(&ip6gre_net_ops);
2383 goto out;
2384}
2385
2386static void __exit ip6gre_fini(void)
2387{
2388 rtnl_link_unregister(&ip6gre_tap_ops);
2389 rtnl_link_unregister(&ip6gre_link_ops);
2390 rtnl_link_unregister(&ip6erspan_tap_ops);
2391 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2392 unregister_pernet_device(&ip6gre_net_ops);
2393}
2394
2395module_init(ip6gre_init);
2396module_exit(ip6gre_fini);
2397MODULE_LICENSE("GPL");
2398MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2399MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2400MODULE_ALIAS_RTNL_LINK("ip6gre");
2401MODULE_ALIAS_RTNL_LINK("ip6gretap");
2402MODULE_ALIAS_RTNL_LINK("ip6erspan");
2403MODULE_ALIAS_NETDEV("ip6gre0");
2404
