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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
386
387 if (!(nt->parms.o_flags & TUNNEL_SEQ))
388 dev->features |= NETIF_F_LLTX;
389
390 ip6gre_tunnel_link(ign, nt);
391 return nt;
392
393failed_free:
394 free_netdev(dev);
395 return NULL;
396}
397
398static void ip6erspan_tunnel_uninit(struct net_device *dev)
399{
400 struct ip6_tnl *t = netdev_priv(dev);
401 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
402
403 ip6erspan_tunnel_unlink_md(ign, t);
404 ip6gre_tunnel_unlink(ign, t);
405 dst_cache_reset(&t->dst_cache);
406 dev_put(dev);
407}
408
409static void ip6gre_tunnel_uninit(struct net_device *dev)
410{
411 struct ip6_tnl *t = netdev_priv(dev);
412 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
413
414 ip6gre_tunnel_unlink_md(ign, t);
415 ip6gre_tunnel_unlink(ign, t);
416 if (ign->fb_tunnel_dev == dev)
417 WRITE_ONCE(ign->fb_tunnel_dev, NULL);
418 dst_cache_reset(&t->dst_cache);
419 dev_put(dev);
420}
421
422
423static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
424 u8 type, u8 code, int offset, __be32 info)
425{
426 struct net *net = dev_net(skb->dev);
427 const struct ipv6hdr *ipv6h;
428 struct tnl_ptk_info tpi;
429 struct ip6_tnl *t;
430
431 if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6),
432 offset) < 0)
433 return -EINVAL;
434
435 ipv6h = (const struct ipv6hdr *)skb->data;
436 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
437 tpi.key, tpi.proto);
438 if (!t)
439 return -ENOENT;
440
441 switch (type) {
442 case ICMPV6_DEST_UNREACH:
443 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
444 t->parms.name);
445 if (code != ICMPV6_PORT_UNREACH)
446 break;
447 return 0;
448 case ICMPV6_TIME_EXCEED:
449 if (code == ICMPV6_EXC_HOPLIMIT) {
450 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
451 t->parms.name);
452 break;
453 }
454 return 0;
455 case ICMPV6_PARAMPROB: {
456 struct ipv6_tlv_tnl_enc_lim *tel;
457 __u32 teli;
458
459 teli = 0;
460 if (code == ICMPV6_HDR_FIELD)
461 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
462
463 if (teli && teli == be32_to_cpu(info) - 2) {
464 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
465 if (tel->encap_limit == 0) {
466 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
467 t->parms.name);
468 }
469 } else {
470 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
471 t->parms.name);
472 }
473 return 0;
474 }
475 case ICMPV6_PKT_TOOBIG:
476 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
477 return 0;
478 case NDISC_REDIRECT:
479 ip6_redirect(skb, net, skb->dev->ifindex, 0,
480 sock_net_uid(net, NULL));
481 return 0;
482 }
483
484 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
485 t->err_count++;
486 else
487 t->err_count = 1;
488 t->err_time = jiffies;
489
490 return 0;
491}
492
493static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
494{
495 const struct ipv6hdr *ipv6h;
496 struct ip6_tnl *tunnel;
497
498 ipv6h = ipv6_hdr(skb);
499 tunnel = ip6gre_tunnel_lookup(skb->dev,
500 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
501 tpi->proto);
502 if (tunnel) {
503 if (tunnel->parms.collect_md) {
504 struct metadata_dst *tun_dst;
505 __be64 tun_id;
506 __be16 flags;
507
508 flags = tpi->flags;
509 tun_id = key32_to_tunnel_id(tpi->key);
510
511 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
512 if (!tun_dst)
513 return PACKET_REJECT;
514
515 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
516 } else {
517 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
518 }
519
520 return PACKET_RCVD;
521 }
522
523 return PACKET_REJECT;
524}
525
526static int ip6erspan_rcv(struct sk_buff *skb,
527 struct tnl_ptk_info *tpi,
528 int gre_hdr_len)
529{
530 struct erspan_base_hdr *ershdr;
531 const struct ipv6hdr *ipv6h;
532 struct erspan_md2 *md2;
533 struct ip6_tnl *tunnel;
534 u8 ver;
535
536 ipv6h = ipv6_hdr(skb);
537 ershdr = (struct erspan_base_hdr *)skb->data;
538 ver = ershdr->ver;
539
540 tunnel = ip6gre_tunnel_lookup(skb->dev,
541 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
542 tpi->proto);
543 if (tunnel) {
544 int len = erspan_hdr_len(ver);
545
546 if (unlikely(!pskb_may_pull(skb, len)))
547 return PACKET_REJECT;
548
549 if (__iptunnel_pull_header(skb, len,
550 htons(ETH_P_TEB),
551 false, false) < 0)
552 return PACKET_REJECT;
553
554 if (tunnel->parms.collect_md) {
555 struct erspan_metadata *pkt_md, *md;
556 struct metadata_dst *tun_dst;
557 struct ip_tunnel_info *info;
558 unsigned char *gh;
559 __be64 tun_id;
560 __be16 flags;
561
562 tpi->flags |= TUNNEL_KEY;
563 flags = tpi->flags;
564 tun_id = key32_to_tunnel_id(tpi->key);
565
566 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
567 sizeof(*md));
568 if (!tun_dst)
569 return PACKET_REJECT;
570
571
572
573
574
575 gh = skb_network_header(skb) +
576 skb_network_header_len(skb);
577 pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len +
578 sizeof(*ershdr));
579 info = &tun_dst->u.tun_info;
580 md = ip_tunnel_info_opts(info);
581 md->version = ver;
582 md2 = &md->u.md2;
583 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
584 ERSPAN_V2_MDSIZE);
585 info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
586 info->options_len = sizeof(*md);
587
588 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
589
590 } else {
591 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
592 }
593
594 return PACKET_RCVD;
595 }
596
597 return PACKET_REJECT;
598}
599
600static int gre_rcv(struct sk_buff *skb)
601{
602 struct tnl_ptk_info tpi;
603 bool csum_err = false;
604 int hdr_len;
605
606 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
607 if (hdr_len < 0)
608 goto drop;
609
610 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
611 goto drop;
612
613 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
614 tpi.proto == htons(ETH_P_ERSPAN2))) {
615 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
616 return 0;
617 goto out;
618 }
619
620 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
621 return 0;
622
623out:
624 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
625drop:
626 kfree_skb(skb);
627 return 0;
628}
629
630static int gre_handle_offloads(struct sk_buff *skb, bool csum)
631{
632 if (csum && skb_checksum_start(skb) < skb->data)
633 return -EINVAL;
634 return iptunnel_handle_offloads(skb,
635 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
636}
637
638static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
639 struct net_device *dev,
640 struct flowi6 *fl6, __u8 *dsfield,
641 int *encap_limit)
642{
643 const struct iphdr *iph = ip_hdr(skb);
644 struct ip6_tnl *t = netdev_priv(dev);
645
646 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
647 *encap_limit = t->parms.encap_limit;
648
649 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
650
651 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
652 *dsfield = ipv4_get_dsfield(iph);
653 else
654 *dsfield = ip6_tclass(t->parms.flowinfo);
655
656 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
657 fl6->flowi6_mark = skb->mark;
658 else
659 fl6->flowi6_mark = t->parms.fwmark;
660
661 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
662}
663
664static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
665 struct net_device *dev,
666 struct flowi6 *fl6, __u8 *dsfield,
667 int *encap_limit)
668{
669 struct ipv6hdr *ipv6h;
670 struct ip6_tnl *t = netdev_priv(dev);
671 __u16 offset;
672
673 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
674
675 ipv6h = ipv6_hdr(skb);
676
677 if (offset > 0) {
678 struct ipv6_tlv_tnl_enc_lim *tel;
679
680 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
681 if (tel->encap_limit == 0) {
682 icmpv6_ndo_send(skb, ICMPV6_PARAMPROB,
683 ICMPV6_HDR_FIELD, offset + 2);
684 return -1;
685 }
686 *encap_limit = tel->encap_limit - 1;
687 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
688 *encap_limit = t->parms.encap_limit;
689 }
690
691 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
692
693 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
694 *dsfield = ipv6_get_dsfield(ipv6h);
695 else
696 *dsfield = ip6_tclass(t->parms.flowinfo);
697
698 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
699 fl6->flowlabel |= ip6_flowlabel(ipv6h);
700
701 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
702 fl6->flowi6_mark = skb->mark;
703 else
704 fl6->flowi6_mark = t->parms.fwmark;
705
706 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
707
708 return 0;
709}
710
711static struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb)
712{
713 struct ip_tunnel_info *tun_info;
714
715 tun_info = skb_tunnel_info(skb);
716 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX)))
717 return ERR_PTR(-EINVAL);
718
719 return tun_info;
720}
721
722static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
723 struct net_device *dev, __u8 dsfield,
724 struct flowi6 *fl6, int encap_limit,
725 __u32 *pmtu, __be16 proto)
726{
727 struct ip6_tnl *tunnel = netdev_priv(dev);
728 __be16 protocol;
729
730 if (dev->type == ARPHRD_ETHER)
731 IPCB(skb)->flags = 0;
732
733 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
734 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
735 else
736 fl6->daddr = tunnel->parms.raddr;
737
738 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
739 return -ENOMEM;
740
741
742 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
743
744 if (tunnel->parms.collect_md) {
745 struct ip_tunnel_info *tun_info;
746 const struct ip_tunnel_key *key;
747 __be16 flags;
748
749 tun_info = skb_tunnel_info_txcheck(skb);
750 if (IS_ERR(tun_info) ||
751 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
752 return -EINVAL;
753
754 key = &tun_info->key;
755 memset(fl6, 0, sizeof(*fl6));
756 fl6->flowi6_proto = IPPROTO_GRE;
757 fl6->daddr = key->u.ipv6.dst;
758 fl6->flowlabel = key->label;
759 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
760
761 dsfield = key->tos;
762 flags = key->tun_flags &
763 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
764 tunnel->tun_hlen = gre_calc_hlen(flags);
765
766 gre_build_header(skb, tunnel->tun_hlen,
767 flags, protocol,
768 tunnel_id_to_key32(tun_info->key.tun_id),
769 (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++)
770 : 0);
771
772 } else {
773 if (tunnel->parms.o_flags & TUNNEL_SEQ)
774 tunnel->o_seqno++;
775
776 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
777 protocol, tunnel->parms.o_key,
778 htonl(tunnel->o_seqno));
779 }
780
781 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
782 NEXTHDR_GRE);
783}
784
785static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
786{
787 struct ip6_tnl *t = netdev_priv(dev);
788 int encap_limit = -1;
789 struct flowi6 fl6;
790 __u8 dsfield = 0;
791 __u32 mtu;
792 int err;
793
794 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
795
796 if (!t->parms.collect_md)
797 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
798 &dsfield, &encap_limit);
799
800 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
801 if (err)
802 return -1;
803
804 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
805 skb->protocol);
806 if (err != 0) {
807
808 if (err == -EMSGSIZE)
809 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
810 htonl(mtu));
811 return -1;
812 }
813
814 return 0;
815}
816
817static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
818{
819 struct ip6_tnl *t = netdev_priv(dev);
820 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
821 int encap_limit = -1;
822 struct flowi6 fl6;
823 __u8 dsfield = 0;
824 __u32 mtu;
825 int err;
826
827 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
828 return -1;
829
830 if (!t->parms.collect_md &&
831 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
832 return -1;
833
834 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
835 return -1;
836
837 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
838 &mtu, skb->protocol);
839 if (err != 0) {
840 if (err == -EMSGSIZE)
841 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
842 return -1;
843 }
844
845 return 0;
846}
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
863 const struct ipv6hdr *hdr)
864{
865 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
866}
867
868static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
869{
870 struct ip6_tnl *t = netdev_priv(dev);
871 int encap_limit = -1;
872 struct flowi6 fl6;
873 __u32 mtu;
874 int err;
875
876 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
877 encap_limit = t->parms.encap_limit;
878
879 if (!t->parms.collect_md)
880 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
881
882 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
883 if (err)
884 return err;
885
886 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
887
888 return err;
889}
890
891static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
892 struct net_device *dev)
893{
894 struct ip6_tnl *t = netdev_priv(dev);
895 struct net_device_stats *stats = &t->dev->stats;
896 int ret;
897
898 if (!pskb_inet_may_pull(skb))
899 goto tx_err;
900
901 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
902 goto tx_err;
903
904 switch (skb->protocol) {
905 case htons(ETH_P_IP):
906 ret = ip6gre_xmit_ipv4(skb, dev);
907 break;
908 case htons(ETH_P_IPV6):
909 ret = ip6gre_xmit_ipv6(skb, dev);
910 break;
911 default:
912 ret = ip6gre_xmit_other(skb, dev);
913 break;
914 }
915
916 if (ret < 0)
917 goto tx_err;
918
919 return NETDEV_TX_OK;
920
921tx_err:
922 if (!t->parms.collect_md || !IS_ERR(skb_tunnel_info_txcheck(skb)))
923 stats->tx_errors++;
924 stats->tx_dropped++;
925 kfree_skb(skb);
926 return NETDEV_TX_OK;
927}
928
929static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
930 struct net_device *dev)
931{
932 struct ip_tunnel_info *tun_info = NULL;
933 struct ip6_tnl *t = netdev_priv(dev);
934 struct dst_entry *dst = skb_dst(skb);
935 struct net_device_stats *stats;
936 bool truncate = false;
937 int encap_limit = -1;
938 __u8 dsfield = false;
939 struct flowi6 fl6;
940 int err = -EINVAL;
941 __be16 proto;
942 __u32 mtu;
943 int nhoff;
944 int thoff;
945
946 if (!pskb_inet_may_pull(skb))
947 goto tx_err;
948
949 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
950 goto tx_err;
951
952 if (gre_handle_offloads(skb, false))
953 goto tx_err;
954
955 if (skb->len > dev->mtu + dev->hard_header_len) {
956 pskb_trim(skb, dev->mtu + dev->hard_header_len);
957 truncate = true;
958 }
959
960 nhoff = skb_network_header(skb) - skb_mac_header(skb);
961 if (skb->protocol == htons(ETH_P_IP) &&
962 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
963 truncate = true;
964
965 thoff = skb_transport_header(skb) - skb_mac_header(skb);
966 if (skb->protocol == htons(ETH_P_IPV6) &&
967 (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff))
968 truncate = true;
969
970 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
971 goto tx_err;
972
973 t->parms.o_flags &= ~TUNNEL_KEY;
974 IPCB(skb)->flags = 0;
975
976
977
978
979 if (t->parms.collect_md) {
980 const struct ip_tunnel_key *key;
981 struct erspan_metadata *md;
982 __be32 tun_id;
983
984 tun_info = skb_tunnel_info_txcheck(skb);
985 if (IS_ERR(tun_info) ||
986 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
987 goto tx_err;
988
989 key = &tun_info->key;
990 memset(&fl6, 0, sizeof(fl6));
991 fl6.flowi6_proto = IPPROTO_GRE;
992 fl6.daddr = key->u.ipv6.dst;
993 fl6.flowlabel = key->label;
994 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
995
996 dsfield = key->tos;
997 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
998 goto tx_err;
999 if (tun_info->options_len < sizeof(*md))
1000 goto tx_err;
1001 md = ip_tunnel_info_opts(tun_info);
1002
1003 tun_id = tunnel_id_to_key32(key->tun_id);
1004 if (md->version == 1) {
1005 erspan_build_header(skb,
1006 ntohl(tun_id),
1007 ntohl(md->u.index), truncate,
1008 false);
1009 } else if (md->version == 2) {
1010 erspan_build_header_v2(skb,
1011 ntohl(tun_id),
1012 md->u.md2.dir,
1013 get_hwid(&md->u.md2),
1014 truncate, false);
1015 } else {
1016 goto tx_err;
1017 }
1018 } else {
1019 switch (skb->protocol) {
1020 case htons(ETH_P_IP):
1021 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1022 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1023 &dsfield, &encap_limit);
1024 break;
1025 case htons(ETH_P_IPV6):
1026 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1027 goto tx_err;
1028 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1029 &dsfield, &encap_limit))
1030 goto tx_err;
1031 break;
1032 default:
1033 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1034 break;
1035 }
1036
1037 if (t->parms.erspan_ver == 1)
1038 erspan_build_header(skb, ntohl(t->parms.o_key),
1039 t->parms.index,
1040 truncate, false);
1041 else if (t->parms.erspan_ver == 2)
1042 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1043 t->parms.dir,
1044 t->parms.hwid,
1045 truncate, false);
1046 else
1047 goto tx_err;
1048
1049 fl6.daddr = t->parms.raddr;
1050 }
1051
1052
1053 proto = (t->parms.erspan_ver == 1) ? htons(ETH_P_ERSPAN)
1054 : htons(ETH_P_ERSPAN2);
1055 gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(t->o_seqno++));
1056
1057
1058 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1059 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false);
1060
1061 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1062 NEXTHDR_GRE);
1063 if (err != 0) {
1064
1065 if (err == -EMSGSIZE) {
1066 if (skb->protocol == htons(ETH_P_IP))
1067 icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1068 ICMP_FRAG_NEEDED, htonl(mtu));
1069 else
1070 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1071 }
1072
1073 goto tx_err;
1074 }
1075 return NETDEV_TX_OK;
1076
1077tx_err:
1078 stats = &t->dev->stats;
1079 if (!IS_ERR(tun_info))
1080 stats->tx_errors++;
1081 stats->tx_dropped++;
1082 kfree_skb(skb);
1083 return NETDEV_TX_OK;
1084}
1085
1086static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1087{
1088 struct net_device *dev = t->dev;
1089 struct __ip6_tnl_parm *p = &t->parms;
1090 struct flowi6 *fl6 = &t->fl.u.ip6;
1091
1092 if (dev->type != ARPHRD_ETHER) {
1093 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1094 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1095 }
1096
1097
1098 fl6->saddr = p->laddr;
1099 fl6->daddr = p->raddr;
1100 fl6->flowi6_oif = p->link;
1101 fl6->flowlabel = 0;
1102 fl6->flowi6_proto = IPPROTO_GRE;
1103
1104 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1105 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1106 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1107 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1108
1109 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1110 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1111
1112 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1113 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1114 dev->flags |= IFF_POINTOPOINT;
1115 else
1116 dev->flags &= ~IFF_POINTOPOINT;
1117}
1118
1119static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1120 int t_hlen)
1121{
1122 const struct __ip6_tnl_parm *p = &t->parms;
1123 struct net_device *dev = t->dev;
1124
1125 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1126 int strict = (ipv6_addr_type(&p->raddr) &
1127 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1128
1129 struct rt6_info *rt = rt6_lookup(t->net,
1130 &p->raddr, &p->laddr,
1131 p->link, NULL, strict);
1132
1133 if (!rt)
1134 return;
1135
1136 if (rt->dst.dev) {
1137 unsigned short dst_len = rt->dst.dev->hard_header_len +
1138 t_hlen;
1139
1140 if (t->dev->header_ops)
1141 dev->hard_header_len = dst_len;
1142 else
1143 dev->needed_headroom = dst_len;
1144
1145 if (set_mtu) {
1146 dev->mtu = rt->dst.dev->mtu - t_hlen;
1147 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1148 dev->mtu -= 8;
1149 if (dev->type == ARPHRD_ETHER)
1150 dev->mtu -= ETH_HLEN;
1151
1152 if (dev->mtu < IPV6_MIN_MTU)
1153 dev->mtu = IPV6_MIN_MTU;
1154 }
1155 }
1156 ip6_rt_put(rt);
1157 }
1158}
1159
1160static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1161{
1162 int t_hlen;
1163
1164 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1165 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1166
1167 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1168
1169 if (tunnel->dev->header_ops)
1170 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1171 else
1172 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1173
1174 return t_hlen;
1175}
1176
1177static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1178{
1179 ip6gre_tnl_link_config_common(t);
1180 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1181}
1182
1183static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1184 const struct __ip6_tnl_parm *p)
1185{
1186 t->parms.laddr = p->laddr;
1187 t->parms.raddr = p->raddr;
1188 t->parms.flags = p->flags;
1189 t->parms.hop_limit = p->hop_limit;
1190 t->parms.encap_limit = p->encap_limit;
1191 t->parms.flowinfo = p->flowinfo;
1192 t->parms.link = p->link;
1193 t->parms.proto = p->proto;
1194 t->parms.i_key = p->i_key;
1195 t->parms.o_key = p->o_key;
1196 t->parms.i_flags = p->i_flags;
1197 t->parms.o_flags = p->o_flags;
1198 t->parms.fwmark = p->fwmark;
1199 t->parms.erspan_ver = p->erspan_ver;
1200 t->parms.index = p->index;
1201 t->parms.dir = p->dir;
1202 t->parms.hwid = p->hwid;
1203 dst_cache_reset(&t->dst_cache);
1204}
1205
1206static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1207 int set_mtu)
1208{
1209 ip6gre_tnl_copy_tnl_parm(t, p);
1210 ip6gre_tnl_link_config(t, set_mtu);
1211 return 0;
1212}
1213
1214static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1215 const struct ip6_tnl_parm2 *u)
1216{
1217 p->laddr = u->laddr;
1218 p->raddr = u->raddr;
1219 p->flags = u->flags;
1220 p->hop_limit = u->hop_limit;
1221 p->encap_limit = u->encap_limit;
1222 p->flowinfo = u->flowinfo;
1223 p->link = u->link;
1224 p->i_key = u->i_key;
1225 p->o_key = u->o_key;
1226 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1227 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1228 memcpy(p->name, u->name, sizeof(u->name));
1229}
1230
1231static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1232 const struct __ip6_tnl_parm *p)
1233{
1234 u->proto = IPPROTO_GRE;
1235 u->laddr = p->laddr;
1236 u->raddr = p->raddr;
1237 u->flags = p->flags;
1238 u->hop_limit = p->hop_limit;
1239 u->encap_limit = p->encap_limit;
1240 u->flowinfo = p->flowinfo;
1241 u->link = p->link;
1242 u->i_key = p->i_key;
1243 u->o_key = p->o_key;
1244 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1245 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1246 memcpy(u->name, p->name, sizeof(u->name));
1247}
1248
1249static int ip6gre_tunnel_ioctl(struct net_device *dev,
1250 struct ifreq *ifr, int cmd)
1251{
1252 int err = 0;
1253 struct ip6_tnl_parm2 p;
1254 struct __ip6_tnl_parm p1;
1255 struct ip6_tnl *t = netdev_priv(dev);
1256 struct net *net = t->net;
1257 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1258
1259 memset(&p1, 0, sizeof(p1));
1260
1261 switch (cmd) {
1262 case SIOCGETTUNNEL:
1263 if (dev == ign->fb_tunnel_dev) {
1264 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1265 err = -EFAULT;
1266 break;
1267 }
1268 ip6gre_tnl_parm_from_user(&p1, &p);
1269 t = ip6gre_tunnel_locate(net, &p1, 0);
1270 if (!t)
1271 t = netdev_priv(dev);
1272 }
1273 memset(&p, 0, sizeof(p));
1274 ip6gre_tnl_parm_to_user(&p, &t->parms);
1275 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1276 err = -EFAULT;
1277 break;
1278
1279 case SIOCADDTUNNEL:
1280 case SIOCCHGTUNNEL:
1281 err = -EPERM;
1282 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1283 goto done;
1284
1285 err = -EFAULT;
1286 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1287 goto done;
1288
1289 err = -EINVAL;
1290 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1291 goto done;
1292
1293 if (!(p.i_flags&GRE_KEY))
1294 p.i_key = 0;
1295 if (!(p.o_flags&GRE_KEY))
1296 p.o_key = 0;
1297
1298 ip6gre_tnl_parm_from_user(&p1, &p);
1299 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1300
1301 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1302 if (t) {
1303 if (t->dev != dev) {
1304 err = -EEXIST;
1305 break;
1306 }
1307 } else {
1308 t = netdev_priv(dev);
1309
1310 ip6gre_tunnel_unlink(ign, t);
1311 synchronize_net();
1312 ip6gre_tnl_change(t, &p1, 1);
1313 ip6gre_tunnel_link(ign, t);
1314 netdev_state_change(dev);
1315 }
1316 }
1317
1318 if (t) {
1319 err = 0;
1320
1321 memset(&p, 0, sizeof(p));
1322 ip6gre_tnl_parm_to_user(&p, &t->parms);
1323 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1324 err = -EFAULT;
1325 } else
1326 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1327 break;
1328
1329 case SIOCDELTUNNEL:
1330 err = -EPERM;
1331 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1332 goto done;
1333
1334 if (dev == ign->fb_tunnel_dev) {
1335 err = -EFAULT;
1336 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1337 goto done;
1338 err = -ENOENT;
1339 ip6gre_tnl_parm_from_user(&p1, &p);
1340 t = ip6gre_tunnel_locate(net, &p1, 0);
1341 if (!t)
1342 goto done;
1343 err = -EPERM;
1344 if (t == netdev_priv(ign->fb_tunnel_dev))
1345 goto done;
1346 dev = t->dev;
1347 }
1348 unregister_netdevice(dev);
1349 err = 0;
1350 break;
1351
1352 default:
1353 err = -EINVAL;
1354 }
1355
1356done:
1357 return err;
1358}
1359
1360static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1361 unsigned short type, const void *daddr,
1362 const void *saddr, unsigned int len)
1363{
1364 struct ip6_tnl *t = netdev_priv(dev);
1365 struct ipv6hdr *ipv6h;
1366 __be16 *p;
1367
1368 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1369 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1370 t->fl.u.ip6.flowlabel,
1371 true, &t->fl.u.ip6));
1372 ipv6h->hop_limit = t->parms.hop_limit;
1373 ipv6h->nexthdr = NEXTHDR_GRE;
1374 ipv6h->saddr = t->parms.laddr;
1375 ipv6h->daddr = t->parms.raddr;
1376
1377 p = (__be16 *)(ipv6h + 1);
1378 p[0] = t->parms.o_flags;
1379 p[1] = htons(type);
1380
1381
1382
1383
1384
1385 if (saddr)
1386 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1387 if (daddr)
1388 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1389 if (!ipv6_addr_any(&ipv6h->daddr))
1390 return t->hlen;
1391
1392 return -t->hlen;
1393}
1394
1395static const struct header_ops ip6gre_header_ops = {
1396 .create = ip6gre_header,
1397};
1398
1399static const struct net_device_ops ip6gre_netdev_ops = {
1400 .ndo_init = ip6gre_tunnel_init,
1401 .ndo_uninit = ip6gre_tunnel_uninit,
1402 .ndo_start_xmit = ip6gre_tunnel_xmit,
1403 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1404 .ndo_change_mtu = ip6_tnl_change_mtu,
1405 .ndo_get_stats64 = dev_get_tstats64,
1406 .ndo_get_iflink = ip6_tnl_get_iflink,
1407};
1408
1409static void ip6gre_dev_free(struct net_device *dev)
1410{
1411 struct ip6_tnl *t = netdev_priv(dev);
1412
1413 gro_cells_destroy(&t->gro_cells);
1414 dst_cache_destroy(&t->dst_cache);
1415 free_percpu(dev->tstats);
1416}
1417
1418static void ip6gre_tunnel_setup(struct net_device *dev)
1419{
1420 dev->netdev_ops = &ip6gre_netdev_ops;
1421 dev->needs_free_netdev = true;
1422 dev->priv_destructor = ip6gre_dev_free;
1423
1424 dev->type = ARPHRD_IP6GRE;
1425
1426 dev->flags |= IFF_NOARP;
1427 dev->addr_len = sizeof(struct in6_addr);
1428 netif_keep_dst(dev);
1429
1430 dev->addr_assign_type = NET_ADDR_RANDOM;
1431 eth_random_addr(dev->perm_addr);
1432}
1433
1434#define GRE6_FEATURES (NETIF_F_SG | \
1435 NETIF_F_FRAGLIST | \
1436 NETIF_F_HIGHDMA | \
1437 NETIF_F_HW_CSUM)
1438
1439static void ip6gre_tnl_init_features(struct net_device *dev)
1440{
1441 struct ip6_tnl *nt = netdev_priv(dev);
1442
1443 dev->features |= GRE6_FEATURES;
1444 dev->hw_features |= GRE6_FEATURES;
1445
1446 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1447
1448
1449
1450
1451 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1452 nt->encap.type == TUNNEL_ENCAP_NONE) {
1453 dev->features |= NETIF_F_GSO_SOFTWARE;
1454 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1455 }
1456
1457
1458
1459
1460 dev->features |= NETIF_F_LLTX;
1461 }
1462}
1463
1464static int ip6gre_tunnel_init_common(struct net_device *dev)
1465{
1466 struct ip6_tnl *tunnel;
1467 int ret;
1468 int t_hlen;
1469
1470 tunnel = netdev_priv(dev);
1471
1472 tunnel->dev = dev;
1473 tunnel->net = dev_net(dev);
1474 strcpy(tunnel->parms.name, dev->name);
1475
1476 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1477 if (!dev->tstats)
1478 return -ENOMEM;
1479
1480 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1481 if (ret)
1482 goto cleanup_alloc_pcpu_stats;
1483
1484 ret = gro_cells_init(&tunnel->gro_cells, dev);
1485 if (ret)
1486 goto cleanup_dst_cache_init;
1487
1488 t_hlen = ip6gre_calc_hlen(tunnel);
1489 dev->mtu = ETH_DATA_LEN - t_hlen;
1490 if (dev->type == ARPHRD_ETHER)
1491 dev->mtu -= ETH_HLEN;
1492 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1493 dev->mtu -= 8;
1494
1495 if (tunnel->parms.collect_md) {
1496 netif_keep_dst(dev);
1497 }
1498 ip6gre_tnl_init_features(dev);
1499
1500 dev_hold(dev);
1501 return 0;
1502
1503cleanup_dst_cache_init:
1504 dst_cache_destroy(&tunnel->dst_cache);
1505cleanup_alloc_pcpu_stats:
1506 free_percpu(dev->tstats);
1507 dev->tstats = NULL;
1508 return ret;
1509}
1510
1511static int ip6gre_tunnel_init(struct net_device *dev)
1512{
1513 struct ip6_tnl *tunnel;
1514 int ret;
1515
1516 ret = ip6gre_tunnel_init_common(dev);
1517 if (ret)
1518 return ret;
1519
1520 tunnel = netdev_priv(dev);
1521
1522 if (tunnel->parms.collect_md)
1523 return 0;
1524
1525 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1526 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1527
1528 if (ipv6_addr_any(&tunnel->parms.raddr))
1529 dev->header_ops = &ip6gre_header_ops;
1530
1531 return 0;
1532}
1533
1534static void ip6gre_fb_tunnel_init(struct net_device *dev)
1535{
1536 struct ip6_tnl *tunnel = netdev_priv(dev);
1537
1538 tunnel->dev = dev;
1539 tunnel->net = dev_net(dev);
1540 strcpy(tunnel->parms.name, dev->name);
1541
1542 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1543}
1544
1545static struct inet6_protocol ip6gre_protocol __read_mostly = {
1546 .handler = gre_rcv,
1547 .err_handler = ip6gre_err,
1548 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1549};
1550
1551static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1552{
1553 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1554 struct net_device *dev, *aux;
1555 int prio;
1556
1557 for_each_netdev_safe(net, dev, aux)
1558 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1559 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1560 dev->rtnl_link_ops == &ip6erspan_tap_ops)
1561 unregister_netdevice_queue(dev, head);
1562
1563 for (prio = 0; prio < 4; prio++) {
1564 int h;
1565 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1566 struct ip6_tnl *t;
1567
1568 t = rtnl_dereference(ign->tunnels[prio][h]);
1569
1570 while (t) {
1571
1572
1573
1574 if (!net_eq(dev_net(t->dev), net))
1575 unregister_netdevice_queue(t->dev,
1576 head);
1577 t = rtnl_dereference(t->next);
1578 }
1579 }
1580 }
1581}
1582
1583static int __net_init ip6gre_init_net(struct net *net)
1584{
1585 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1586 struct net_device *ndev;
1587 int err;
1588
1589 if (!net_has_fallback_tunnels(net))
1590 return 0;
1591 ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1592 NET_NAME_UNKNOWN, ip6gre_tunnel_setup);
1593 if (!ndev) {
1594 err = -ENOMEM;
1595 goto err_alloc_dev;
1596 }
1597 ign->fb_tunnel_dev = ndev;
1598 dev_net_set(ign->fb_tunnel_dev, net);
1599
1600
1601
1602 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1603
1604
1605 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1606 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1607
1608 err = register_netdev(ign->fb_tunnel_dev);
1609 if (err)
1610 goto err_reg_dev;
1611
1612 rcu_assign_pointer(ign->tunnels_wc[0],
1613 netdev_priv(ign->fb_tunnel_dev));
1614 return 0;
1615
1616err_reg_dev:
1617 free_netdev(ndev);
1618err_alloc_dev:
1619 return err;
1620}
1621
1622static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1623{
1624 struct net *net;
1625 LIST_HEAD(list);
1626
1627 rtnl_lock();
1628 list_for_each_entry(net, net_list, exit_list)
1629 ip6gre_destroy_tunnels(net, &list);
1630 unregister_netdevice_many(&list);
1631 rtnl_unlock();
1632}
1633
1634static struct pernet_operations ip6gre_net_ops = {
1635 .init = ip6gre_init_net,
1636 .exit_batch = ip6gre_exit_batch_net,
1637 .id = &ip6gre_net_id,
1638 .size = sizeof(struct ip6gre_net),
1639};
1640
1641static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1642 struct netlink_ext_ack *extack)
1643{
1644 __be16 flags;
1645
1646 if (!data)
1647 return 0;
1648
1649 flags = 0;
1650 if (data[IFLA_GRE_IFLAGS])
1651 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1652 if (data[IFLA_GRE_OFLAGS])
1653 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1654 if (flags & (GRE_VERSION|GRE_ROUTING))
1655 return -EINVAL;
1656
1657 return 0;
1658}
1659
1660static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1661 struct netlink_ext_ack *extack)
1662{
1663 struct in6_addr daddr;
1664
1665 if (tb[IFLA_ADDRESS]) {
1666 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1667 return -EINVAL;
1668 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1669 return -EADDRNOTAVAIL;
1670 }
1671
1672 if (!data)
1673 goto out;
1674
1675 if (data[IFLA_GRE_REMOTE]) {
1676 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1677 if (ipv6_addr_any(&daddr))
1678 return -EINVAL;
1679 }
1680
1681out:
1682 return ip6gre_tunnel_validate(tb, data, extack);
1683}
1684
1685static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1686 struct netlink_ext_ack *extack)
1687{
1688 __be16 flags = 0;
1689 int ret, ver = 0;
1690
1691 if (!data)
1692 return 0;
1693
1694 ret = ip6gre_tap_validate(tb, data, extack);
1695 if (ret)
1696 return ret;
1697
1698
1699 if (data[IFLA_GRE_OFLAGS])
1700 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1701 if (data[IFLA_GRE_IFLAGS])
1702 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1703 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1704 flags != (GRE_SEQ | GRE_KEY))
1705 return -EINVAL;
1706
1707
1708
1709
1710 if (data[IFLA_GRE_IKEY] &&
1711 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1712 return -EINVAL;
1713
1714 if (data[IFLA_GRE_OKEY] &&
1715 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1716 return -EINVAL;
1717
1718 if (data[IFLA_GRE_ERSPAN_VER]) {
1719 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1720 if (ver != 1 && ver != 2)
1721 return -EINVAL;
1722 }
1723
1724 if (ver == 1) {
1725 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1726 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1727
1728 if (index & ~INDEX_MASK)
1729 return -EINVAL;
1730 }
1731 } else if (ver == 2) {
1732 if (data[IFLA_GRE_ERSPAN_DIR]) {
1733 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1734
1735 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1736 return -EINVAL;
1737 }
1738
1739 if (data[IFLA_GRE_ERSPAN_HWID]) {
1740 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1741
1742 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1743 return -EINVAL;
1744 }
1745 }
1746
1747 return 0;
1748}
1749
1750static void ip6erspan_set_version(struct nlattr *data[],
1751 struct __ip6_tnl_parm *parms)
1752{
1753 if (!data)
1754 return;
1755
1756 parms->erspan_ver = 1;
1757 if (data[IFLA_GRE_ERSPAN_VER])
1758 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1759
1760 if (parms->erspan_ver == 1) {
1761 if (data[IFLA_GRE_ERSPAN_INDEX])
1762 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1763 } else if (parms->erspan_ver == 2) {
1764 if (data[IFLA_GRE_ERSPAN_DIR])
1765 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1766 if (data[IFLA_GRE_ERSPAN_HWID])
1767 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1768 }
1769}
1770
1771static void ip6gre_netlink_parms(struct nlattr *data[],
1772 struct __ip6_tnl_parm *parms)
1773{
1774 memset(parms, 0, sizeof(*parms));
1775
1776 if (!data)
1777 return;
1778
1779 if (data[IFLA_GRE_LINK])
1780 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1781
1782 if (data[IFLA_GRE_IFLAGS])
1783 parms->i_flags = gre_flags_to_tnl_flags(
1784 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1785
1786 if (data[IFLA_GRE_OFLAGS])
1787 parms->o_flags = gre_flags_to_tnl_flags(
1788 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1789
1790 if (data[IFLA_GRE_IKEY])
1791 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1792
1793 if (data[IFLA_GRE_OKEY])
1794 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1795
1796 if (data[IFLA_GRE_LOCAL])
1797 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1798
1799 if (data[IFLA_GRE_REMOTE])
1800 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1801
1802 if (data[IFLA_GRE_TTL])
1803 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1804
1805 if (data[IFLA_GRE_ENCAP_LIMIT])
1806 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1807
1808 if (data[IFLA_GRE_FLOWINFO])
1809 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1810
1811 if (data[IFLA_GRE_FLAGS])
1812 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1813
1814 if (data[IFLA_GRE_FWMARK])
1815 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1816
1817 if (data[IFLA_GRE_COLLECT_METADATA])
1818 parms->collect_md = true;
1819}
1820
1821static int ip6gre_tap_init(struct net_device *dev)
1822{
1823 int ret;
1824
1825 ret = ip6gre_tunnel_init_common(dev);
1826 if (ret)
1827 return ret;
1828
1829 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1830
1831 return 0;
1832}
1833
1834static const struct net_device_ops ip6gre_tap_netdev_ops = {
1835 .ndo_init = ip6gre_tap_init,
1836 .ndo_uninit = ip6gre_tunnel_uninit,
1837 .ndo_start_xmit = ip6gre_tunnel_xmit,
1838 .ndo_set_mac_address = eth_mac_addr,
1839 .ndo_validate_addr = eth_validate_addr,
1840 .ndo_change_mtu = ip6_tnl_change_mtu,
1841 .ndo_get_stats64 = dev_get_tstats64,
1842 .ndo_get_iflink = ip6_tnl_get_iflink,
1843};
1844
1845static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1846{
1847 int t_hlen;
1848
1849 tunnel->tun_hlen = 8;
1850 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1851 erspan_hdr_len(tunnel->parms.erspan_ver);
1852
1853 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1854 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1855 return t_hlen;
1856}
1857
1858static int ip6erspan_tap_init(struct net_device *dev)
1859{
1860 struct ip6_tnl *tunnel;
1861 int t_hlen;
1862 int ret;
1863
1864 tunnel = netdev_priv(dev);
1865
1866 tunnel->dev = dev;
1867 tunnel->net = dev_net(dev);
1868 strcpy(tunnel->parms.name, dev->name);
1869
1870 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1871 if (!dev->tstats)
1872 return -ENOMEM;
1873
1874 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1875 if (ret)
1876 goto cleanup_alloc_pcpu_stats;
1877
1878 ret = gro_cells_init(&tunnel->gro_cells, dev);
1879 if (ret)
1880 goto cleanup_dst_cache_init;
1881
1882 t_hlen = ip6erspan_calc_hlen(tunnel);
1883 dev->mtu = ETH_DATA_LEN - t_hlen;
1884 if (dev->type == ARPHRD_ETHER)
1885 dev->mtu -= ETH_HLEN;
1886 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1887 dev->mtu -= 8;
1888
1889 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1890 ip6erspan_tnl_link_config(tunnel, 1);
1891
1892 dev_hold(dev);
1893 return 0;
1894
1895cleanup_dst_cache_init:
1896 dst_cache_destroy(&tunnel->dst_cache);
1897cleanup_alloc_pcpu_stats:
1898 free_percpu(dev->tstats);
1899 dev->tstats = NULL;
1900 return ret;
1901}
1902
1903static const struct net_device_ops ip6erspan_netdev_ops = {
1904 .ndo_init = ip6erspan_tap_init,
1905 .ndo_uninit = ip6erspan_tunnel_uninit,
1906 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1907 .ndo_set_mac_address = eth_mac_addr,
1908 .ndo_validate_addr = eth_validate_addr,
1909 .ndo_change_mtu = ip6_tnl_change_mtu,
1910 .ndo_get_stats64 = dev_get_tstats64,
1911 .ndo_get_iflink = ip6_tnl_get_iflink,
1912};
1913
1914static void ip6gre_tap_setup(struct net_device *dev)
1915{
1916
1917 ether_setup(dev);
1918
1919 dev->max_mtu = 0;
1920 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1921 dev->needs_free_netdev = true;
1922 dev->priv_destructor = ip6gre_dev_free;
1923
1924 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1925 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1926 netif_keep_dst(dev);
1927}
1928
1929static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1930 struct ip_tunnel_encap *ipencap)
1931{
1932 bool ret = false;
1933
1934 memset(ipencap, 0, sizeof(*ipencap));
1935
1936 if (!data)
1937 return ret;
1938
1939 if (data[IFLA_GRE_ENCAP_TYPE]) {
1940 ret = true;
1941 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1942 }
1943
1944 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1945 ret = true;
1946 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1947 }
1948
1949 if (data[IFLA_GRE_ENCAP_SPORT]) {
1950 ret = true;
1951 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1952 }
1953
1954 if (data[IFLA_GRE_ENCAP_DPORT]) {
1955 ret = true;
1956 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1957 }
1958
1959 return ret;
1960}
1961
1962static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1963 struct nlattr *tb[], struct nlattr *data[],
1964 struct netlink_ext_ack *extack)
1965{
1966 struct ip6_tnl *nt;
1967 struct ip_tunnel_encap ipencap;
1968 int err;
1969
1970 nt = netdev_priv(dev);
1971
1972 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1973 int err = ip6_tnl_encap_setup(nt, &ipencap);
1974
1975 if (err < 0)
1976 return err;
1977 }
1978
1979 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1980 eth_hw_addr_random(dev);
1981
1982 nt->dev = dev;
1983 nt->net = dev_net(dev);
1984
1985 err = register_netdevice(dev);
1986 if (err)
1987 goto out;
1988
1989 if (tb[IFLA_MTU])
1990 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1991
1992out:
1993 return err;
1994}
1995
1996static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1997 struct nlattr *tb[], struct nlattr *data[],
1998 struct netlink_ext_ack *extack)
1999{
2000 struct ip6_tnl *nt = netdev_priv(dev);
2001 struct net *net = dev_net(dev);
2002 struct ip6gre_net *ign;
2003 int err;
2004
2005 ip6gre_netlink_parms(data, &nt->parms);
2006 ign = net_generic(net, ip6gre_net_id);
2007
2008 if (nt->parms.collect_md) {
2009 if (rtnl_dereference(ign->collect_md_tun))
2010 return -EEXIST;
2011 } else {
2012 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2013 return -EEXIST;
2014 }
2015
2016 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2017 if (!err) {
2018 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
2019 ip6gre_tunnel_link_md(ign, nt);
2020 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2021 }
2022 return err;
2023}
2024
2025static struct ip6_tnl *
2026ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2027 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2028 struct netlink_ext_ack *extack)
2029{
2030 struct ip6_tnl *t, *nt = netdev_priv(dev);
2031 struct net *net = nt->net;
2032 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2033 struct ip_tunnel_encap ipencap;
2034
2035 if (dev == ign->fb_tunnel_dev)
2036 return ERR_PTR(-EINVAL);
2037
2038 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2039 int err = ip6_tnl_encap_setup(nt, &ipencap);
2040
2041 if (err < 0)
2042 return ERR_PTR(err);
2043 }
2044
2045 ip6gre_netlink_parms(data, p_p);
2046
2047 t = ip6gre_tunnel_locate(net, p_p, 0);
2048
2049 if (t) {
2050 if (t->dev != dev)
2051 return ERR_PTR(-EEXIST);
2052 } else {
2053 t = nt;
2054 }
2055
2056 return t;
2057}
2058
2059static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2060 struct nlattr *data[],
2061 struct netlink_ext_ack *extack)
2062{
2063 struct ip6_tnl *t = netdev_priv(dev);
2064 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2065 struct __ip6_tnl_parm p;
2066
2067 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2068 if (IS_ERR(t))
2069 return PTR_ERR(t);
2070
2071 ip6gre_tunnel_unlink_md(ign, t);
2072 ip6gre_tunnel_unlink(ign, t);
2073 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2074 ip6gre_tunnel_link_md(ign, t);
2075 ip6gre_tunnel_link(ign, t);
2076 return 0;
2077}
2078
2079static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2080{
2081 struct net *net = dev_net(dev);
2082 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2083
2084 if (dev != ign->fb_tunnel_dev)
2085 unregister_netdevice_queue(dev, head);
2086}
2087
2088static size_t ip6gre_get_size(const struct net_device *dev)
2089{
2090 return
2091
2092 nla_total_size(4) +
2093
2094 nla_total_size(2) +
2095
2096 nla_total_size(2) +
2097
2098 nla_total_size(4) +
2099
2100 nla_total_size(4) +
2101
2102 nla_total_size(sizeof(struct in6_addr)) +
2103
2104 nla_total_size(sizeof(struct in6_addr)) +
2105
2106 nla_total_size(1) +
2107
2108 nla_total_size(1) +
2109
2110 nla_total_size(4) +
2111
2112 nla_total_size(4) +
2113
2114 nla_total_size(2) +
2115
2116 nla_total_size(2) +
2117
2118 nla_total_size(2) +
2119
2120 nla_total_size(2) +
2121
2122 nla_total_size(0) +
2123
2124 nla_total_size(4) +
2125
2126 nla_total_size(4) +
2127 0;
2128}
2129
2130static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2131{
2132 struct ip6_tnl *t = netdev_priv(dev);
2133 struct __ip6_tnl_parm *p = &t->parms;
2134 __be16 o_flags = p->o_flags;
2135
2136 if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2137 if (!p->collect_md)
2138 o_flags |= TUNNEL_KEY;
2139
2140 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2141 goto nla_put_failure;
2142
2143 if (p->erspan_ver == 1) {
2144 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2145 goto nla_put_failure;
2146 } else {
2147 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2148 goto nla_put_failure;
2149 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2150 goto nla_put_failure;
2151 }
2152 }
2153
2154 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2155 nla_put_be16(skb, IFLA_GRE_IFLAGS,
2156 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2157 nla_put_be16(skb, IFLA_GRE_OFLAGS,
2158 gre_tnl_flags_to_gre_flags(o_flags)) ||
2159 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2160 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2161 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2162 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2163 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2164 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2165 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2166 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2167 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
2168 goto nla_put_failure;
2169
2170 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2171 t->encap.type) ||
2172 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2173 t->encap.sport) ||
2174 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2175 t->encap.dport) ||
2176 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2177 t->encap.flags))
2178 goto nla_put_failure;
2179
2180 if (p->collect_md) {
2181 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2182 goto nla_put_failure;
2183 }
2184
2185 return 0;
2186
2187nla_put_failure:
2188 return -EMSGSIZE;
2189}
2190
2191static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2192 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2193 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2194 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2195 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2196 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2197 [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct ipv6hdr, saddr) },
2198 [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct ipv6hdr, daddr) },
2199 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2200 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2201 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2202 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
2203 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2204 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2205 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2206 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
2207 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2208 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
2209 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2210 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2211 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2212 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
2213};
2214
2215static void ip6erspan_tap_setup(struct net_device *dev)
2216{
2217 ether_setup(dev);
2218
2219 dev->max_mtu = 0;
2220 dev->netdev_ops = &ip6erspan_netdev_ops;
2221 dev->needs_free_netdev = true;
2222 dev->priv_destructor = ip6gre_dev_free;
2223
2224 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2225 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2226 netif_keep_dst(dev);
2227}
2228
2229static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2230 struct nlattr *tb[], struct nlattr *data[],
2231 struct netlink_ext_ack *extack)
2232{
2233 struct ip6_tnl *nt = netdev_priv(dev);
2234 struct net *net = dev_net(dev);
2235 struct ip6gre_net *ign;
2236 int err;
2237
2238 ip6gre_netlink_parms(data, &nt->parms);
2239 ip6erspan_set_version(data, &nt->parms);
2240 ign = net_generic(net, ip6gre_net_id);
2241
2242 if (nt->parms.collect_md) {
2243 if (rtnl_dereference(ign->collect_md_tun_erspan))
2244 return -EEXIST;
2245 } else {
2246 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2247 return -EEXIST;
2248 }
2249
2250 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2251 if (!err) {
2252 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2253 ip6erspan_tunnel_link_md(ign, nt);
2254 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2255 }
2256 return err;
2257}
2258
2259static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2260{
2261 ip6gre_tnl_link_config_common(t);
2262 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2263}
2264
2265static int ip6erspan_tnl_change(struct ip6_tnl *t,
2266 const struct __ip6_tnl_parm *p, int set_mtu)
2267{
2268 ip6gre_tnl_copy_tnl_parm(t, p);
2269 ip6erspan_tnl_link_config(t, set_mtu);
2270 return 0;
2271}
2272
2273static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2274 struct nlattr *data[],
2275 struct netlink_ext_ack *extack)
2276{
2277 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2278 struct __ip6_tnl_parm p;
2279 struct ip6_tnl *t;
2280
2281 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2282 if (IS_ERR(t))
2283 return PTR_ERR(t);
2284
2285 ip6erspan_set_version(data, &p);
2286 ip6gre_tunnel_unlink_md(ign, t);
2287 ip6gre_tunnel_unlink(ign, t);
2288 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2289 ip6erspan_tunnel_link_md(ign, t);
2290 ip6gre_tunnel_link(ign, t);
2291 return 0;
2292}
2293
2294static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2295 .kind = "ip6gre",
2296 .maxtype = IFLA_GRE_MAX,
2297 .policy = ip6gre_policy,
2298 .priv_size = sizeof(struct ip6_tnl),
2299 .setup = ip6gre_tunnel_setup,
2300 .validate = ip6gre_tunnel_validate,
2301 .newlink = ip6gre_newlink,
2302 .changelink = ip6gre_changelink,
2303 .dellink = ip6gre_dellink,
2304 .get_size = ip6gre_get_size,
2305 .fill_info = ip6gre_fill_info,
2306 .get_link_net = ip6_tnl_get_link_net,
2307};
2308
2309static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2310 .kind = "ip6gretap",
2311 .maxtype = IFLA_GRE_MAX,
2312 .policy = ip6gre_policy,
2313 .priv_size = sizeof(struct ip6_tnl),
2314 .setup = ip6gre_tap_setup,
2315 .validate = ip6gre_tap_validate,
2316 .newlink = ip6gre_newlink,
2317 .changelink = ip6gre_changelink,
2318 .get_size = ip6gre_get_size,
2319 .fill_info = ip6gre_fill_info,
2320 .get_link_net = ip6_tnl_get_link_net,
2321};
2322
2323static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2324 .kind = "ip6erspan",
2325 .maxtype = IFLA_GRE_MAX,
2326 .policy = ip6gre_policy,
2327 .priv_size = sizeof(struct ip6_tnl),
2328 .setup = ip6erspan_tap_setup,
2329 .validate = ip6erspan_tap_validate,
2330 .newlink = ip6erspan_newlink,
2331 .changelink = ip6erspan_changelink,
2332 .get_size = ip6gre_get_size,
2333 .fill_info = ip6gre_fill_info,
2334 .get_link_net = ip6_tnl_get_link_net,
2335};
2336
2337
2338
2339
2340
2341static int __init ip6gre_init(void)
2342{
2343 int err;
2344
2345 pr_info("GRE over IPv6 tunneling driver\n");
2346
2347 err = register_pernet_device(&ip6gre_net_ops);
2348 if (err < 0)
2349 return err;
2350
2351 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2352 if (err < 0) {
2353 pr_info("%s: can't add protocol\n", __func__);
2354 goto add_proto_failed;
2355 }
2356
2357 err = rtnl_link_register(&ip6gre_link_ops);
2358 if (err < 0)
2359 goto rtnl_link_failed;
2360
2361 err = rtnl_link_register(&ip6gre_tap_ops);
2362 if (err < 0)
2363 goto tap_ops_failed;
2364
2365 err = rtnl_link_register(&ip6erspan_tap_ops);
2366 if (err < 0)
2367 goto erspan_link_failed;
2368
2369out:
2370 return err;
2371
2372erspan_link_failed:
2373 rtnl_link_unregister(&ip6gre_tap_ops);
2374tap_ops_failed:
2375 rtnl_link_unregister(&ip6gre_link_ops);
2376rtnl_link_failed:
2377 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2378add_proto_failed:
2379 unregister_pernet_device(&ip6gre_net_ops);
2380 goto out;
2381}
2382
2383static void __exit ip6gre_fini(void)
2384{
2385 rtnl_link_unregister(&ip6gre_tap_ops);
2386 rtnl_link_unregister(&ip6gre_link_ops);
2387 rtnl_link_unregister(&ip6erspan_tap_ops);
2388 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2389 unregister_pernet_device(&ip6gre_net_ops);
2390}
2391
2392module_init(ip6gre_init);
2393module_exit(ip6gre_fini);
2394MODULE_LICENSE("GPL");
2395MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2396MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2397MODULE_ALIAS_RTNL_LINK("ip6gre");
2398MODULE_ALIAS_RTNL_LINK("ip6gretap");
2399MODULE_ALIAS_RTNL_LINK("ip6erspan");
2400MODULE_ALIAS_NETDEV("ip6gre0");
2401
