1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * GRE over IPv6 protocol decoder.
4 *
5 * Authors: Dmitry Kozlov (xeb@mail.ru)
6 */
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
57 static bool log_ecn_error = true;
58 module_param(log_ecn_error, bool, 0644);
59 MODULE_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
64 static unsigned int ip6gre_net_id __read_mostly;
65 struct 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
73 static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
74 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
75 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly;
76 static int ip6gre_tunnel_init(struct net_device *dev);
77 static void ip6gre_tunnel_setup(struct net_device *dev);
78 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
79 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
80 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu);
81
82 /* Tunnel hash table */
83
84 /*
85 4 hash tables:
86
87 3: (remote,local)
88 2: (remote,*)
89 1: (*,local)
90 0: (*,*)
91
92 We require exact key match i.e. if a key is present in packet
93 it will match only tunnel with the same key; if it is not present,
94 it will match only keyless tunnel.
95
96 All keysless packets, if not matched configured keyless tunnels
97 will match fallback tunnel.
98 */
99
100 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
101 static 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 /* Given src, dst and key, find appropriate for input tunnel. */
114
115 static 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
249 static 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
267 static 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
273 static 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
279 static 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
285 static 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
292 static 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
298 static 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
306 static 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
321 static 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
346 static 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 /* Can use a lockless transmit, unless we generate output sequences */
387 if (!(nt->parms.o_flags & TUNNEL_SEQ))
388 dev->features |= NETIF_F_LLTX;
389
390 dev_hold(dev);
391 ip6gre_tunnel_link(ign, nt);
392 return nt;
393
394 failed_free:
395 free_netdev(dev);
396 return NULL;
397 }
398
399 static void ip6erspan_tunnel_uninit(struct net_device *dev)
400 {
401 struct ip6_tnl *t = netdev_priv(dev);
402 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
403
404 ip6erspan_tunnel_unlink_md(ign, t);
405 ip6gre_tunnel_unlink(ign, t);
406 dst_cache_reset(&t->dst_cache);
407 dev_put(dev);
408 }
409
410 static void ip6gre_tunnel_uninit(struct net_device *dev)
411 {
412 struct ip6_tnl *t = netdev_priv(dev);
413 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
414
415 ip6gre_tunnel_unlink_md(ign, t);
416 ip6gre_tunnel_unlink(ign, t);
417 if (ign->fb_tunnel_dev == dev)
418 WRITE_ONCE(ign->fb_tunnel_dev, NULL);
419 dst_cache_reset(&t->dst_cache);
420 dev_put(dev);
421 }
422
423
424 static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
425 u8 type, u8 code, int offset, __be32 info)
426 {
427 struct net *net = dev_net(skb->dev);
428 const struct ipv6hdr *ipv6h;
429 struct tnl_ptk_info tpi;
430 struct ip6_tnl *t;
431
432 if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6),
433 offset) < 0)
434 return -EINVAL;
435
436 ipv6h = (const struct ipv6hdr *)skb->data;
437 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
438 tpi.key, tpi.proto);
439 if (!t)
440 return -ENOENT;
441
442 switch (type) {
443 case ICMPV6_DEST_UNREACH:
444 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
445 t->parms.name);
446 if (code != ICMPV6_PORT_UNREACH)
447 break;
448 return 0;
449 case ICMPV6_TIME_EXCEED:
450 if (code == ICMPV6_EXC_HOPLIMIT) {
451 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
452 t->parms.name);
453 break;
454 }
455 return 0;
456 case ICMPV6_PARAMPROB: {
457 struct ipv6_tlv_tnl_enc_lim *tel;
458 __u32 teli;
459
460 teli = 0;
461 if (code == ICMPV6_HDR_FIELD)
462 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
463
464 if (teli && teli == be32_to_cpu(info) - 2) {
465 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
466 if (tel->encap_limit == 0) {
467 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
468 t->parms.name);
469 }
470 } else {
471 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
472 t->parms.name);
473 }
474 return 0;
475 }
476 case ICMPV6_PKT_TOOBIG:
477 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
478 return 0;
479 case NDISC_REDIRECT:
480 ip6_redirect(skb, net, skb->dev->ifindex, 0,
481 sock_net_uid(net, NULL));
482 return 0;
483 }
484
485 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
486 t->err_count++;
487 else
488 t->err_count = 1;
489 t->err_time = jiffies;
490
491 return 0;
492 }
493
494 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
495 {
496 const struct ipv6hdr *ipv6h;
497 struct ip6_tnl *tunnel;
498
499 ipv6h = ipv6_hdr(skb);
500 tunnel = ip6gre_tunnel_lookup(skb->dev,
501 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
502 tpi->proto);
503 if (tunnel) {
504 if (tunnel->parms.collect_md) {
505 struct metadata_dst *tun_dst;
506 __be64 tun_id;
507 __be16 flags;
508
509 flags = tpi->flags;
510 tun_id = key32_to_tunnel_id(tpi->key);
511
512 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
513 if (!tun_dst)
514 return PACKET_REJECT;
515
516 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
517 } else {
518 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
519 }
520
521 return PACKET_RCVD;
522 }
523
524 return PACKET_REJECT;
525 }
526
527 static int ip6erspan_rcv(struct sk_buff *skb,
528 struct tnl_ptk_info *tpi,
529 int gre_hdr_len)
530 {
531 struct erspan_base_hdr *ershdr;
532 const struct ipv6hdr *ipv6h;
533 struct erspan_md2 *md2;
534 struct ip6_tnl *tunnel;
535 u8 ver;
536
537 ipv6h = ipv6_hdr(skb);
538 ershdr = (struct erspan_base_hdr *)skb->data;
539 ver = ershdr->ver;
540
541 tunnel = ip6gre_tunnel_lookup(skb->dev,
542 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
543 tpi->proto);
544 if (tunnel) {
545 int len = erspan_hdr_len(ver);
546
547 if (unlikely(!pskb_may_pull(skb, len)))
548 return PACKET_REJECT;
549
550 if (__iptunnel_pull_header(skb, len,
551 htons(ETH_P_TEB),
552 false, false) < 0)
553 return PACKET_REJECT;
554
555 if (tunnel->parms.collect_md) {
556 struct erspan_metadata *pkt_md, *md;
557 struct metadata_dst *tun_dst;
558 struct ip_tunnel_info *info;
559 unsigned char *gh;
560 __be64 tun_id;
561 __be16 flags;
562
563 tpi->flags |= TUNNEL_KEY;
564 flags = tpi->flags;
565 tun_id = key32_to_tunnel_id(tpi->key);
566
567 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
568 sizeof(*md));
569 if (!tun_dst)
570 return PACKET_REJECT;
571
572 /* skb can be uncloned in __iptunnel_pull_header, so
573 * old pkt_md is no longer valid and we need to reset
574 * it
575 */
576 gh = skb_network_header(skb) +
577 skb_network_header_len(skb);
578 pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len +
579 sizeof(*ershdr));
580 info = &tun_dst->u.tun_info;
581 md = ip_tunnel_info_opts(info);
582 md->version = ver;
583 md2 = &md->u.md2;
584 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
585 ERSPAN_V2_MDSIZE);
586 info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
587 info->options_len = sizeof(*md);
588
589 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
590
591 } else {
592 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
593 }
594
595 return PACKET_RCVD;
596 }
597
598 return PACKET_REJECT;
599 }
600
601 static int gre_rcv(struct sk_buff *skb)
602 {
603 struct tnl_ptk_info tpi;
604 bool csum_err = false;
605 int hdr_len;
606
607 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
608 if (hdr_len < 0)
609 goto drop;
610
611 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
612 goto drop;
613
614 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
615 tpi.proto == htons(ETH_P_ERSPAN2))) {
616 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
617 return 0;
618 goto out;
619 }
620
621 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
622 return 0;
623
624 out:
625 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
626 drop:
627 kfree_skb(skb);
628 return 0;
629 }
630
631 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
632 {
633 return iptunnel_handle_offloads(skb,
634 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
635 }
636
637 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
638 struct net_device *dev,
639 struct flowi6 *fl6, __u8 *dsfield,
640 int *encap_limit)
641 {
642 const struct iphdr *iph = ip_hdr(skb);
643 struct ip6_tnl *t = netdev_priv(dev);
644
645 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
646 *encap_limit = t->parms.encap_limit;
647
648 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
649
650 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
651 *dsfield = ipv4_get_dsfield(iph);
652 else
653 *dsfield = ip6_tclass(t->parms.flowinfo);
654
655 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
656 fl6->flowi6_mark = skb->mark;
657 else
658 fl6->flowi6_mark = t->parms.fwmark;
659
660 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
661 }
662
663 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
664 struct net_device *dev,
665 struct flowi6 *fl6, __u8 *dsfield,
666 int *encap_limit)
667 {
668 struct ipv6hdr *ipv6h;
669 struct ip6_tnl *t = netdev_priv(dev);
670 __u16 offset;
671
672 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
673 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
674 ipv6h = ipv6_hdr(skb);
675
676 if (offset > 0) {
677 struct ipv6_tlv_tnl_enc_lim *tel;
678
679 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
680 if (tel->encap_limit == 0) {
681 icmpv6_send(skb, ICMPV6_PARAMPROB,
682 ICMPV6_HDR_FIELD, offset + 2);
683 return -1;
684 }
685 *encap_limit = tel->encap_limit - 1;
686 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
687 *encap_limit = t->parms.encap_limit;
688 }
689
690 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
691
692 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
693 *dsfield = ipv6_get_dsfield(ipv6h);
694 else
695 *dsfield = ip6_tclass(t->parms.flowinfo);
696
697 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
698 fl6->flowlabel |= ip6_flowlabel(ipv6h);
699
700 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
701 fl6->flowi6_mark = skb->mark;
702 else
703 fl6->flowi6_mark = t->parms.fwmark;
704
705 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
706
707 return 0;
708 }
709
710 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
711 struct net_device *dev, __u8 dsfield,
712 struct flowi6 *fl6, int encap_limit,
713 __u32 *pmtu, __be16 proto)
714 {
715 struct ip6_tnl *tunnel = netdev_priv(dev);
716 __be16 protocol;
717
718 if (dev->type == ARPHRD_ETHER)
719 IPCB(skb)->flags = 0;
720
721 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
722 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
723 else
724 fl6->daddr = tunnel->parms.raddr;
725
726 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
727 return -ENOMEM;
728
729 /* Push GRE header. */
730 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
731
732 if (tunnel->parms.collect_md) {
733 struct ip_tunnel_info *tun_info;
734 const struct ip_tunnel_key *key;
735 __be16 flags;
736
737 tun_info = skb_tunnel_info(skb);
738 if (unlikely(!tun_info ||
739 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
740 ip_tunnel_info_af(tun_info) != AF_INET6))
741 return -EINVAL;
742
743 key = &tun_info->key;
744 memset(fl6, 0, sizeof(*fl6));
745 fl6->flowi6_proto = IPPROTO_GRE;
746 fl6->daddr = key->u.ipv6.dst;
747 fl6->flowlabel = key->label;
748 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
749
750 dsfield = key->tos;
751 flags = key->tun_flags &
752 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
753 tunnel->tun_hlen = gre_calc_hlen(flags);
754
755 gre_build_header(skb, tunnel->tun_hlen,
756 flags, protocol,
757 tunnel_id_to_key32(tun_info->key.tun_id),
758 (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++)
759 : 0);
760
761 } else {
762 if (tunnel->parms.o_flags & TUNNEL_SEQ)
763 tunnel->o_seqno++;
764
765 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
766 protocol, tunnel->parms.o_key,
767 htonl(tunnel->o_seqno));
768 }
769
770 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
771 NEXTHDR_GRE);
772 }
773
774 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
775 {
776 struct ip6_tnl *t = netdev_priv(dev);
777 int encap_limit = -1;
778 struct flowi6 fl6;
779 __u8 dsfield = 0;
780 __u32 mtu;
781 int err;
782
783 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
784
785 if (!t->parms.collect_md)
786 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
787 &dsfield, &encap_limit);
788
789 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
790 if (err)
791 return -1;
792
793 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
794 skb->protocol);
795 if (err != 0) {
796 /* XXX: send ICMP error even if DF is not set. */
797 if (err == -EMSGSIZE)
798 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
799 htonl(mtu));
800 return -1;
801 }
802
803 return 0;
804 }
805
806 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
807 {
808 struct ip6_tnl *t = netdev_priv(dev);
809 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
810 int encap_limit = -1;
811 struct flowi6 fl6;
812 __u8 dsfield = 0;
813 __u32 mtu;
814 int err;
815
816 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
817 return -1;
818
819 if (!t->parms.collect_md &&
820 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
821 return -1;
822
823 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
824 return -1;
825
826 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
827 &mtu, skb->protocol);
828 if (err != 0) {
829 if (err == -EMSGSIZE)
830 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
831 return -1;
832 }
833
834 return 0;
835 }
836
837 /**
838 * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own
839 * @t: the outgoing tunnel device
840 * @hdr: IPv6 header from the incoming packet
841 *
842 * Description:
843 * Avoid trivial tunneling loop by checking that tunnel exit-point
844 * doesn't match source of incoming packet.
845 *
846 * Return:
847 * 1 if conflict,
848 * 0 else
849 **/
850
851 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
852 const struct ipv6hdr *hdr)
853 {
854 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
855 }
856
857 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
858 {
859 struct ip6_tnl *t = netdev_priv(dev);
860 int encap_limit = -1;
861 struct flowi6 fl6;
862 __u32 mtu;
863 int err;
864
865 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
866 encap_limit = t->parms.encap_limit;
867
868 if (!t->parms.collect_md)
869 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
870
871 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
872 if (err)
873 return err;
874
875 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
876
877 return err;
878 }
879
880 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
881 struct net_device *dev)
882 {
883 struct ip6_tnl *t = netdev_priv(dev);
884 struct net_device_stats *stats = &t->dev->stats;
885 int ret;
886
887 if (!pskb_inet_may_pull(skb))
888 goto tx_err;
889
890 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
891 goto tx_err;
892
893 switch (skb->protocol) {
894 case htons(ETH_P_IP):
895 ret = ip6gre_xmit_ipv4(skb, dev);
896 break;
897 case htons(ETH_P_IPV6):
898 ret = ip6gre_xmit_ipv6(skb, dev);
899 break;
900 default:
901 ret = ip6gre_xmit_other(skb, dev);
902 break;
903 }
904
905 if (ret < 0)
906 goto tx_err;
907
908 return NETDEV_TX_OK;
909
910 tx_err:
911 stats->tx_errors++;
912 stats->tx_dropped++;
913 kfree_skb(skb);
914 return NETDEV_TX_OK;
915 }
916
917 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
918 struct net_device *dev)
919 {
920 struct ip6_tnl *t = netdev_priv(dev);
921 struct dst_entry *dst = skb_dst(skb);
922 struct net_device_stats *stats;
923 bool truncate = false;
924 int encap_limit = -1;
925 __u8 dsfield = false;
926 struct flowi6 fl6;
927 int err = -EINVAL;
928 __be16 proto;
929 __u32 mtu;
930 int nhoff;
931 int thoff;
932
933 if (!pskb_inet_may_pull(skb))
934 goto tx_err;
935
936 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
937 goto tx_err;
938
939 if (gre_handle_offloads(skb, false))
940 goto tx_err;
941
942 if (skb->len > dev->mtu + dev->hard_header_len) {
943 pskb_trim(skb, dev->mtu + dev->hard_header_len);
944 truncate = true;
945 }
946
947 nhoff = skb_network_header(skb) - skb_mac_header(skb);
948 if (skb->protocol == htons(ETH_P_IP) &&
949 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
950 truncate = true;
951
952 thoff = skb_transport_header(skb) - skb_mac_header(skb);
953 if (skb->protocol == htons(ETH_P_IPV6) &&
954 (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff))
955 truncate = true;
956
957 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
958 goto tx_err;
959
960 t->parms.o_flags &= ~TUNNEL_KEY;
961 IPCB(skb)->flags = 0;
962
963 /* For collect_md mode, derive fl6 from the tunnel key,
964 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
965 */
966 if (t->parms.collect_md) {
967 struct ip_tunnel_info *tun_info;
968 const struct ip_tunnel_key *key;
969 struct erspan_metadata *md;
970 __be32 tun_id;
971
972 tun_info = skb_tunnel_info(skb);
973 if (unlikely(!tun_info ||
974 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
975 ip_tunnel_info_af(tun_info) != AF_INET6))
976 goto tx_err;
977
978 key = &tun_info->key;
979 memset(&fl6, 0, sizeof(fl6));
980 fl6.flowi6_proto = IPPROTO_GRE;
981 fl6.daddr = key->u.ipv6.dst;
982 fl6.flowlabel = key->label;
983 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
984
985 dsfield = key->tos;
986 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
987 goto tx_err;
988 if (tun_info->options_len < sizeof(*md))
989 goto tx_err;
990 md = ip_tunnel_info_opts(tun_info);
991
992 tun_id = tunnel_id_to_key32(key->tun_id);
993 if (md->version == 1) {
994 erspan_build_header(skb,
995 ntohl(tun_id),
996 ntohl(md->u.index), truncate,
997 false);
998 } else if (md->version == 2) {
999 erspan_build_header_v2(skb,
1000 ntohl(tun_id),
1001 md->u.md2.dir,
1002 get_hwid(&md->u.md2),
1003 truncate, false);
1004 } else {
1005 goto tx_err;
1006 }
1007 } else {
1008 switch (skb->protocol) {
1009 case htons(ETH_P_IP):
1010 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1011 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1012 &dsfield, &encap_limit);
1013 break;
1014 case htons(ETH_P_IPV6):
1015 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1016 goto tx_err;
1017 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1018 &dsfield, &encap_limit))
1019 goto tx_err;
1020 break;
1021 default:
1022 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1023 break;
1024 }
1025
1026 if (t->parms.erspan_ver == 1)
1027 erspan_build_header(skb, ntohl(t->parms.o_key),
1028 t->parms.index,
1029 truncate, false);
1030 else if (t->parms.erspan_ver == 2)
1031 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1032 t->parms.dir,
1033 t->parms.hwid,
1034 truncate, false);
1035 else
1036 goto tx_err;
1037
1038 fl6.daddr = t->parms.raddr;
1039 }
1040
1041 /* Push GRE header. */
1042 proto = (t->parms.erspan_ver == 1) ? htons(ETH_P_ERSPAN)
1043 : htons(ETH_P_ERSPAN2);
1044 gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(t->o_seqno++));
1045
1046 /* TooBig packet may have updated dst->dev's mtu */
1047 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1048 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false);
1049
1050 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1051 NEXTHDR_GRE);
1052 if (err != 0) {
1053 /* XXX: send ICMP error even if DF is not set. */
1054 if (err == -EMSGSIZE) {
1055 if (skb->protocol == htons(ETH_P_IP))
1056 icmp_send(skb, ICMP_DEST_UNREACH,
1057 ICMP_FRAG_NEEDED, htonl(mtu));
1058 else
1059 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1060 }
1061
1062 goto tx_err;
1063 }
1064 return NETDEV_TX_OK;
1065
1066 tx_err:
1067 stats = &t->dev->stats;
1068 stats->tx_errors++;
1069 stats->tx_dropped++;
1070 kfree_skb(skb);
1071 return NETDEV_TX_OK;
1072 }
1073
1074 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1075 {
1076 struct net_device *dev = t->dev;
1077 struct __ip6_tnl_parm *p = &t->parms;
1078 struct flowi6 *fl6 = &t->fl.u.ip6;
1079
1080 if (dev->type != ARPHRD_ETHER) {
1081 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1082 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1083 }
1084
1085 /* Set up flowi template */
1086 fl6->saddr = p->laddr;
1087 fl6->daddr = p->raddr;
1088 fl6->flowi6_oif = p->link;
1089 fl6->flowlabel = 0;
1090 fl6->flowi6_proto = IPPROTO_GRE;
1091
1092 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1093 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1094 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1095 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1096
1097 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1098 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1099
1100 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1101 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1102 dev->flags |= IFF_POINTOPOINT;
1103 else
1104 dev->flags &= ~IFF_POINTOPOINT;
1105 }
1106
1107 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1108 int t_hlen)
1109 {
1110 const struct __ip6_tnl_parm *p = &t->parms;
1111 struct net_device *dev = t->dev;
1112
1113 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1114 int strict = (ipv6_addr_type(&p->raddr) &
1115 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1116
1117 struct rt6_info *rt = rt6_lookup(t->net,
1118 &p->raddr, &p->laddr,
1119 p->link, NULL, strict);
1120
1121 if (!rt)
1122 return;
1123
1124 if (rt->dst.dev) {
1125 unsigned short dst_len = rt->dst.dev->hard_header_len +
1126 t_hlen;
1127
1128 if (t->dev->header_ops)
1129 dev->hard_header_len = dst_len;
1130 else
1131 dev->needed_headroom = dst_len;
1132
1133 if (set_mtu) {
1134 dev->mtu = rt->dst.dev->mtu - t_hlen;
1135 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1136 dev->mtu -= 8;
1137 if (dev->type == ARPHRD_ETHER)
1138 dev->mtu -= ETH_HLEN;
1139
1140 if (dev->mtu < IPV6_MIN_MTU)
1141 dev->mtu = IPV6_MIN_MTU;
1142 }
1143 }
1144 ip6_rt_put(rt);
1145 }
1146 }
1147
1148 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1149 {
1150 int t_hlen;
1151
1152 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1153 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1154
1155 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1156
1157 if (tunnel->dev->header_ops)
1158 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1159 else
1160 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1161
1162 return t_hlen;
1163 }
1164
1165 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1166 {
1167 ip6gre_tnl_link_config_common(t);
1168 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1169 }
1170
1171 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1172 const struct __ip6_tnl_parm *p)
1173 {
1174 t->parms.laddr = p->laddr;
1175 t->parms.raddr = p->raddr;
1176 t->parms.flags = p->flags;
1177 t->parms.hop_limit = p->hop_limit;
1178 t->parms.encap_limit = p->encap_limit;
1179 t->parms.flowinfo = p->flowinfo;
1180 t->parms.link = p->link;
1181 t->parms.proto = p->proto;
1182 t->parms.i_key = p->i_key;
1183 t->parms.o_key = p->o_key;
1184 t->parms.i_flags = p->i_flags;
1185 t->parms.o_flags = p->o_flags;
1186 t->parms.fwmark = p->fwmark;
1187 t->parms.erspan_ver = p->erspan_ver;
1188 t->parms.index = p->index;
1189 t->parms.dir = p->dir;
1190 t->parms.hwid = p->hwid;
1191 dst_cache_reset(&t->dst_cache);
1192 }
1193
1194 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1195 int set_mtu)
1196 {
1197 ip6gre_tnl_copy_tnl_parm(t, p);
1198 ip6gre_tnl_link_config(t, set_mtu);
1199 return 0;
1200 }
1201
1202 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1203 const struct ip6_tnl_parm2 *u)
1204 {
1205 p->laddr = u->laddr;
1206 p->raddr = u->raddr;
1207 p->flags = u->flags;
1208 p->hop_limit = u->hop_limit;
1209 p->encap_limit = u->encap_limit;
1210 p->flowinfo = u->flowinfo;
1211 p->link = u->link;
1212 p->i_key = u->i_key;
1213 p->o_key = u->o_key;
1214 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1215 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1216 memcpy(p->name, u->name, sizeof(u->name));
1217 }
1218
1219 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1220 const struct __ip6_tnl_parm *p)
1221 {
1222 u->proto = IPPROTO_GRE;
1223 u->laddr = p->laddr;
1224 u->raddr = p->raddr;
1225 u->flags = p->flags;
1226 u->hop_limit = p->hop_limit;
1227 u->encap_limit = p->encap_limit;
1228 u->flowinfo = p->flowinfo;
1229 u->link = p->link;
1230 u->i_key = p->i_key;
1231 u->o_key = p->o_key;
1232 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1233 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1234 memcpy(u->name, p->name, sizeof(u->name));
1235 }
1236
1237 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1238 struct ifreq *ifr, int cmd)
1239 {
1240 int err = 0;
1241 struct ip6_tnl_parm2 p;
1242 struct __ip6_tnl_parm p1;
1243 struct ip6_tnl *t = netdev_priv(dev);
1244 struct net *net = t->net;
1245 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1246
1247 memset(&p1, 0, sizeof(p1));
1248
1249 switch (cmd) {
1250 case SIOCGETTUNNEL:
1251 if (dev == ign->fb_tunnel_dev) {
1252 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1253 err = -EFAULT;
1254 break;
1255 }
1256 ip6gre_tnl_parm_from_user(&p1, &p);
1257 t = ip6gre_tunnel_locate(net, &p1, 0);
1258 if (!t)
1259 t = netdev_priv(dev);
1260 }
1261 memset(&p, 0, sizeof(p));
1262 ip6gre_tnl_parm_to_user(&p, &t->parms);
1263 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1264 err = -EFAULT;
1265 break;
1266
1267 case SIOCADDTUNNEL:
1268 case SIOCCHGTUNNEL:
1269 err = -EPERM;
1270 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1271 goto done;
1272
1273 err = -EFAULT;
1274 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1275 goto done;
1276
1277 err = -EINVAL;
1278 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1279 goto done;
1280
1281 if (!(p.i_flags&GRE_KEY))
1282 p.i_key = 0;
1283 if (!(p.o_flags&GRE_KEY))
1284 p.o_key = 0;
1285
1286 ip6gre_tnl_parm_from_user(&p1, &p);
1287 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1288
1289 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1290 if (t) {
1291 if (t->dev != dev) {
1292 err = -EEXIST;
1293 break;
1294 }
1295 } else {
1296 t = netdev_priv(dev);
1297
1298 ip6gre_tunnel_unlink(ign, t);
1299 synchronize_net();
1300 ip6gre_tnl_change(t, &p1, 1);
1301 ip6gre_tunnel_link(ign, t);
1302 netdev_state_change(dev);
1303 }
1304 }
1305
1306 if (t) {
1307 err = 0;
1308
1309 memset(&p, 0, sizeof(p));
1310 ip6gre_tnl_parm_to_user(&p, &t->parms);
1311 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1312 err = -EFAULT;
1313 } else
1314 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1315 break;
1316
1317 case SIOCDELTUNNEL:
1318 err = -EPERM;
1319 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1320 goto done;
1321
1322 if (dev == ign->fb_tunnel_dev) {
1323 err = -EFAULT;
1324 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1325 goto done;
1326 err = -ENOENT;
1327 ip6gre_tnl_parm_from_user(&p1, &p);
1328 t = ip6gre_tunnel_locate(net, &p1, 0);
1329 if (!t)
1330 goto done;
1331 err = -EPERM;
1332 if (t == netdev_priv(ign->fb_tunnel_dev))
1333 goto done;
1334 dev = t->dev;
1335 }
1336 unregister_netdevice(dev);
1337 err = 0;
1338 break;
1339
1340 default:
1341 err = -EINVAL;
1342 }
1343
1344 done:
1345 return err;
1346 }
1347
1348 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1349 unsigned short type, const void *daddr,
1350 const void *saddr, unsigned int len)
1351 {
1352 struct ip6_tnl *t = netdev_priv(dev);
1353 struct ipv6hdr *ipv6h;
1354 __be16 *p;
1355
1356 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1357 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1358 t->fl.u.ip6.flowlabel,
1359 true, &t->fl.u.ip6));
1360 ipv6h->hop_limit = t->parms.hop_limit;
1361 ipv6h->nexthdr = NEXTHDR_GRE;
1362 ipv6h->saddr = t->parms.laddr;
1363 ipv6h->daddr = t->parms.raddr;
1364
1365 p = (__be16 *)(ipv6h + 1);
1366 p[0] = t->parms.o_flags;
1367 p[1] = htons(type);
1368
1369 /*
1370 * Set the source hardware address.
1371 */
1372
1373 if (saddr)
1374 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1375 if (daddr)
1376 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1377 if (!ipv6_addr_any(&ipv6h->daddr))
1378 return t->hlen;
1379
1380 return -t->hlen;
1381 }
1382
1383 static const struct header_ops ip6gre_header_ops = {
1384 .create = ip6gre_header,
1385 };
1386
1387 static const struct net_device_ops ip6gre_netdev_ops = {
1388 .ndo_init = ip6gre_tunnel_init,
1389 .ndo_uninit = ip6gre_tunnel_uninit,
1390 .ndo_start_xmit = ip6gre_tunnel_xmit,
1391 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1392 .ndo_change_mtu = ip6_tnl_change_mtu,
1393 .ndo_get_stats64 = ip_tunnel_get_stats64,
1394 .ndo_get_iflink = ip6_tnl_get_iflink,
1395 };
1396
1397 static void ip6gre_dev_free(struct net_device *dev)
1398 {
1399 struct ip6_tnl *t = netdev_priv(dev);
1400
1401 gro_cells_destroy(&t->gro_cells);
1402 dst_cache_destroy(&t->dst_cache);
1403 free_percpu(dev->tstats);
1404 }
1405
1406 static void ip6gre_tunnel_setup(struct net_device *dev)
1407 {
1408 dev->netdev_ops = &ip6gre_netdev_ops;
1409 dev->needs_free_netdev = true;
1410 dev->priv_destructor = ip6gre_dev_free;
1411
1412 dev->type = ARPHRD_IP6GRE;
1413
1414 dev->flags |= IFF_NOARP;
1415 dev->addr_len = sizeof(struct in6_addr);
1416 netif_keep_dst(dev);
1417 /* This perm addr will be used as interface identifier by IPv6 */
1418 dev->addr_assign_type = NET_ADDR_RANDOM;
1419 eth_random_addr(dev->perm_addr);
1420 }
1421
1422 #define GRE6_FEATURES (NETIF_F_SG | \
1423 NETIF_F_FRAGLIST | \
1424 NETIF_F_HIGHDMA | \
1425 NETIF_F_HW_CSUM)
1426
1427 static void ip6gre_tnl_init_features(struct net_device *dev)
1428 {
1429 struct ip6_tnl *nt = netdev_priv(dev);
1430
1431 dev->features |= GRE6_FEATURES;
1432 dev->hw_features |= GRE6_FEATURES;
1433
1434 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1435 /* TCP offload with GRE SEQ is not supported, nor
1436 * can we support 2 levels of outer headers requiring
1437 * an update.
1438 */
1439 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1440 nt->encap.type == TUNNEL_ENCAP_NONE) {
1441 dev->features |= NETIF_F_GSO_SOFTWARE;
1442 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1443 }
1444
1445 /* Can use a lockless transmit, unless we generate
1446 * output sequences
1447 */
1448 dev->features |= NETIF_F_LLTX;
1449 }
1450 }
1451
1452 static int ip6gre_tunnel_init_common(struct net_device *dev)
1453 {
1454 struct ip6_tnl *tunnel;
1455 int ret;
1456 int t_hlen;
1457
1458 tunnel = netdev_priv(dev);
1459
1460 tunnel->dev = dev;
1461 tunnel->net = dev_net(dev);
1462 strcpy(tunnel->parms.name, dev->name);
1463
1464 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1465 if (!dev->tstats)
1466 return -ENOMEM;
1467
1468 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1469 if (ret)
1470 goto cleanup_alloc_pcpu_stats;
1471
1472 ret = gro_cells_init(&tunnel->gro_cells, dev);
1473 if (ret)
1474 goto cleanup_dst_cache_init;
1475
1476 t_hlen = ip6gre_calc_hlen(tunnel);
1477 dev->mtu = ETH_DATA_LEN - t_hlen;
1478 if (dev->type == ARPHRD_ETHER)
1479 dev->mtu -= ETH_HLEN;
1480 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1481 dev->mtu -= 8;
1482
1483 if (tunnel->parms.collect_md) {
1484 netif_keep_dst(dev);
1485 }
1486 ip6gre_tnl_init_features(dev);
1487
1488 return 0;
1489
1490 cleanup_dst_cache_init:
1491 dst_cache_destroy(&tunnel->dst_cache);
1492 cleanup_alloc_pcpu_stats:
1493 free_percpu(dev->tstats);
1494 dev->tstats = NULL;
1495 return ret;
1496 }
1497
1498 static int ip6gre_tunnel_init(struct net_device *dev)
1499 {
1500 struct ip6_tnl *tunnel;
1501 int ret;
1502
1503 ret = ip6gre_tunnel_init_common(dev);
1504 if (ret)
1505 return ret;
1506
1507 tunnel = netdev_priv(dev);
1508
1509 if (tunnel->parms.collect_md)
1510 return 0;
1511
1512 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1513 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1514
1515 if (ipv6_addr_any(&tunnel->parms.raddr))
1516 dev->header_ops = &ip6gre_header_ops;
1517
1518 return 0;
1519 }
1520
1521 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1522 {
1523 struct ip6_tnl *tunnel = netdev_priv(dev);
1524
1525 tunnel->dev = dev;
1526 tunnel->net = dev_net(dev);
1527 strcpy(tunnel->parms.name, dev->name);
1528
1529 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1530
1531 dev_hold(dev);
1532 }
1533
1534 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1535 .handler = gre_rcv,
1536 .err_handler = ip6gre_err,
1537 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1538 };
1539
1540 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1541 {
1542 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1543 struct net_device *dev, *aux;
1544 int prio;
1545
1546 for_each_netdev_safe(net, dev, aux)
1547 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1548 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1549 dev->rtnl_link_ops == &ip6erspan_tap_ops)
1550 unregister_netdevice_queue(dev, head);
1551
1552 for (prio = 0; prio < 4; prio++) {
1553 int h;
1554 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1555 struct ip6_tnl *t;
1556
1557 t = rtnl_dereference(ign->tunnels[prio][h]);
1558
1559 while (t) {
1560 /* If dev is in the same netns, it has already
1561 * been added to the list by the previous loop.
1562 */
1563 if (!net_eq(dev_net(t->dev), net))
1564 unregister_netdevice_queue(t->dev,
1565 head);
1566 t = rtnl_dereference(t->next);
1567 }
1568 }
1569 }
1570 }
1571
1572 static int __net_init ip6gre_init_net(struct net *net)
1573 {
1574 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1575 struct net_device *ndev;
1576 int err;
1577
1578 if (!net_has_fallback_tunnels(net))
1579 return 0;
1580 ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1581 NET_NAME_UNKNOWN, ip6gre_tunnel_setup);
1582 if (!ndev) {
1583 err = -ENOMEM;
1584 goto err_alloc_dev;
1585 }
1586 ign->fb_tunnel_dev = ndev;
1587 dev_net_set(ign->fb_tunnel_dev, net);
1588 /* FB netdevice is special: we have one, and only one per netns.
1589 * Allowing to move it to another netns is clearly unsafe.
1590 */
1591 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1592
1593
1594 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1595 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1596
1597 err = register_netdev(ign->fb_tunnel_dev);
1598 if (err)
1599 goto err_reg_dev;
1600
1601 rcu_assign_pointer(ign->tunnels_wc[0],
1602 netdev_priv(ign->fb_tunnel_dev));
1603 return 0;
1604
1605 err_reg_dev:
1606 free_netdev(ndev);
1607 err_alloc_dev:
1608 return err;
1609 }
1610
1611 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1612 {
1613 struct net *net;
1614 LIST_HEAD(list);
1615
1616 rtnl_lock();
1617 list_for_each_entry(net, net_list, exit_list)
1618 ip6gre_destroy_tunnels(net, &list);
1619 unregister_netdevice_many(&list);
1620 rtnl_unlock();
1621 }
1622
1623 static struct pernet_operations ip6gre_net_ops = {
1624 .init = ip6gre_init_net,
1625 .exit_batch = ip6gre_exit_batch_net,
1626 .id = &ip6gre_net_id,
1627 .size = sizeof(struct ip6gre_net),
1628 };
1629
1630 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1631 struct netlink_ext_ack *extack)
1632 {
1633 __be16 flags;
1634
1635 if (!data)
1636 return 0;
1637
1638 flags = 0;
1639 if (data[IFLA_GRE_IFLAGS])
1640 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1641 if (data[IFLA_GRE_OFLAGS])
1642 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1643 if (flags & (GRE_VERSION|GRE_ROUTING))
1644 return -EINVAL;
1645
1646 return 0;
1647 }
1648
1649 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1650 struct netlink_ext_ack *extack)
1651 {
1652 struct in6_addr daddr;
1653
1654 if (tb[IFLA_ADDRESS]) {
1655 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1656 return -EINVAL;
1657 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1658 return -EADDRNOTAVAIL;
1659 }
1660
1661 if (!data)
1662 goto out;
1663
1664 if (data[IFLA_GRE_REMOTE]) {
1665 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1666 if (ipv6_addr_any(&daddr))
1667 return -EINVAL;
1668 }
1669
1670 out:
1671 return ip6gre_tunnel_validate(tb, data, extack);
1672 }
1673
1674 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1675 struct netlink_ext_ack *extack)
1676 {
1677 __be16 flags = 0;
1678 int ret, ver = 0;
1679
1680 if (!data)
1681 return 0;
1682
1683 ret = ip6gre_tap_validate(tb, data, extack);
1684 if (ret)
1685 return ret;
1686
1687 /* ERSPAN should only have GRE sequence and key flag */
1688 if (data[IFLA_GRE_OFLAGS])
1689 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1690 if (data[IFLA_GRE_IFLAGS])
1691 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1692 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1693 flags != (GRE_SEQ | GRE_KEY))
1694 return -EINVAL;
1695
1696 /* ERSPAN Session ID only has 10-bit. Since we reuse
1697 * 32-bit key field as ID, check it's range.
1698 */
1699 if (data[IFLA_GRE_IKEY] &&
1700 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1701 return -EINVAL;
1702
1703 if (data[IFLA_GRE_OKEY] &&
1704 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1705 return -EINVAL;
1706
1707 if (data[IFLA_GRE_ERSPAN_VER]) {
1708 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1709 if (ver != 1 && ver != 2)
1710 return -EINVAL;
1711 }
1712
1713 if (ver == 1) {
1714 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1715 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1716
1717 if (index & ~INDEX_MASK)
1718 return -EINVAL;
1719 }
1720 } else if (ver == 2) {
1721 if (data[IFLA_GRE_ERSPAN_DIR]) {
1722 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1723
1724 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1725 return -EINVAL;
1726 }
1727
1728 if (data[IFLA_GRE_ERSPAN_HWID]) {
1729 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1730
1731 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1732 return -EINVAL;
1733 }
1734 }
1735
1736 return 0;
1737 }
1738
1739 static void ip6erspan_set_version(struct nlattr *data[],
1740 struct __ip6_tnl_parm *parms)
1741 {
1742 if (!data)
1743 return;
1744
1745 parms->erspan_ver = 1;
1746 if (data[IFLA_GRE_ERSPAN_VER])
1747 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1748
1749 if (parms->erspan_ver == 1) {
1750 if (data[IFLA_GRE_ERSPAN_INDEX])
1751 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1752 } else if (parms->erspan_ver == 2) {
1753 if (data[IFLA_GRE_ERSPAN_DIR])
1754 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1755 if (data[IFLA_GRE_ERSPAN_HWID])
1756 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1757 }
1758 }
1759
1760 static void ip6gre_netlink_parms(struct nlattr *data[],
1761 struct __ip6_tnl_parm *parms)
1762 {
1763 memset(parms, 0, sizeof(*parms));
1764
1765 if (!data)
1766 return;
1767
1768 if (data[IFLA_GRE_LINK])
1769 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1770
1771 if (data[IFLA_GRE_IFLAGS])
1772 parms->i_flags = gre_flags_to_tnl_flags(
1773 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1774
1775 if (data[IFLA_GRE_OFLAGS])
1776 parms->o_flags = gre_flags_to_tnl_flags(
1777 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1778
1779 if (data[IFLA_GRE_IKEY])
1780 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1781
1782 if (data[IFLA_GRE_OKEY])
1783 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1784
1785 if (data[IFLA_GRE_LOCAL])
1786 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1787
1788 if (data[IFLA_GRE_REMOTE])
1789 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1790
1791 if (data[IFLA_GRE_TTL])
1792 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1793
1794 if (data[IFLA_GRE_ENCAP_LIMIT])
1795 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1796
1797 if (data[IFLA_GRE_FLOWINFO])
1798 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1799
1800 if (data[IFLA_GRE_FLAGS])
1801 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1802
1803 if (data[IFLA_GRE_FWMARK])
1804 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1805
1806 if (data[IFLA_GRE_COLLECT_METADATA])
1807 parms->collect_md = true;
1808 }
1809
1810 static int ip6gre_tap_init(struct net_device *dev)
1811 {
1812 int ret;
1813
1814 ret = ip6gre_tunnel_init_common(dev);
1815 if (ret)
1816 return ret;
1817
1818 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1819
1820 return 0;
1821 }
1822
1823 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1824 .ndo_init = ip6gre_tap_init,
1825 .ndo_uninit = ip6gre_tunnel_uninit,
1826 .ndo_start_xmit = ip6gre_tunnel_xmit,
1827 .ndo_set_mac_address = eth_mac_addr,
1828 .ndo_validate_addr = eth_validate_addr,
1829 .ndo_change_mtu = ip6_tnl_change_mtu,
1830 .ndo_get_stats64 = ip_tunnel_get_stats64,
1831 .ndo_get_iflink = ip6_tnl_get_iflink,
1832 };
1833
1834 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1835 {
1836 int t_hlen;
1837
1838 tunnel->tun_hlen = 8;
1839 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1840 erspan_hdr_len(tunnel->parms.erspan_ver);
1841
1842 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1843 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1844 return t_hlen;
1845 }
1846
1847 static int ip6erspan_tap_init(struct net_device *dev)
1848 {
1849 struct ip6_tnl *tunnel;
1850 int t_hlen;
1851 int ret;
1852
1853 tunnel = netdev_priv(dev);
1854
1855 tunnel->dev = dev;
1856 tunnel->net = dev_net(dev);
1857 strcpy(tunnel->parms.name, dev->name);
1858
1859 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1860 if (!dev->tstats)
1861 return -ENOMEM;
1862
1863 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1864 if (ret)
1865 goto cleanup_alloc_pcpu_stats;
1866
1867 ret = gro_cells_init(&tunnel->gro_cells, dev);
1868 if (ret)
1869 goto cleanup_dst_cache_init;
1870
1871 t_hlen = ip6erspan_calc_hlen(tunnel);
1872 dev->mtu = ETH_DATA_LEN - t_hlen;
1873 if (dev->type == ARPHRD_ETHER)
1874 dev->mtu -= ETH_HLEN;
1875 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1876 dev->mtu -= 8;
1877
1878 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1879 ip6erspan_tnl_link_config(tunnel, 1);
1880
1881 return 0;
1882
1883 cleanup_dst_cache_init:
1884 dst_cache_destroy(&tunnel->dst_cache);
1885 cleanup_alloc_pcpu_stats:
1886 free_percpu(dev->tstats);
1887 dev->tstats = NULL;
1888 return ret;
1889 }
1890
1891 static const struct net_device_ops ip6erspan_netdev_ops = {
1892 .ndo_init = ip6erspan_tap_init,
1893 .ndo_uninit = ip6erspan_tunnel_uninit,
1894 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1895 .ndo_set_mac_address = eth_mac_addr,
1896 .ndo_validate_addr = eth_validate_addr,
1897 .ndo_change_mtu = ip6_tnl_change_mtu,
1898 .ndo_get_stats64 = ip_tunnel_get_stats64,
1899 .ndo_get_iflink = ip6_tnl_get_iflink,
1900 };
1901
1902 static void ip6gre_tap_setup(struct net_device *dev)
1903 {
1904
1905 ether_setup(dev);
1906
1907 dev->max_mtu = 0;
1908 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1909 dev->needs_free_netdev = true;
1910 dev->priv_destructor = ip6gre_dev_free;
1911
1912 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1913 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1914 netif_keep_dst(dev);
1915 }
1916
1917 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1918 struct ip_tunnel_encap *ipencap)
1919 {
1920 bool ret = false;
1921
1922 memset(ipencap, 0, sizeof(*ipencap));
1923
1924 if (!data)
1925 return ret;
1926
1927 if (data[IFLA_GRE_ENCAP_TYPE]) {
1928 ret = true;
1929 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1930 }
1931
1932 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1933 ret = true;
1934 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1935 }
1936
1937 if (data[IFLA_GRE_ENCAP_SPORT]) {
1938 ret = true;
1939 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1940 }
1941
1942 if (data[IFLA_GRE_ENCAP_DPORT]) {
1943 ret = true;
1944 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1945 }
1946
1947 return ret;
1948 }
1949
1950 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1951 struct nlattr *tb[], struct nlattr *data[],
1952 struct netlink_ext_ack *extack)
1953 {
1954 struct ip6_tnl *nt;
1955 struct ip_tunnel_encap ipencap;
1956 int err;
1957
1958 nt = netdev_priv(dev);
1959
1960 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1961 int err = ip6_tnl_encap_setup(nt, &ipencap);
1962
1963 if (err < 0)
1964 return err;
1965 }
1966
1967 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1968 eth_hw_addr_random(dev);
1969
1970 nt->dev = dev;
1971 nt->net = dev_net(dev);
1972
1973 err = register_netdevice(dev);
1974 if (err)
1975 goto out;
1976
1977 if (tb[IFLA_MTU])
1978 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1979
1980 dev_hold(dev);
1981
1982 out:
1983 return err;
1984 }
1985
1986 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1987 struct nlattr *tb[], struct nlattr *data[],
1988 struct netlink_ext_ack *extack)
1989 {
1990 struct ip6_tnl *nt = netdev_priv(dev);
1991 struct net *net = dev_net(dev);
1992 struct ip6gre_net *ign;
1993 int err;
1994
1995 ip6gre_netlink_parms(data, &nt->parms);
1996 ign = net_generic(net, ip6gre_net_id);
1997
1998 if (nt->parms.collect_md) {
1999 if (rtnl_dereference(ign->collect_md_tun))
2000 return -EEXIST;
2001 } else {
2002 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2003 return -EEXIST;
2004 }
2005
2006 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2007 if (!err) {
2008 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
2009 ip6gre_tunnel_link_md(ign, nt);
2010 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2011 }
2012 return err;
2013 }
2014
2015 static struct ip6_tnl *
2016 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2017 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2018 struct netlink_ext_ack *extack)
2019 {
2020 struct ip6_tnl *t, *nt = netdev_priv(dev);
2021 struct net *net = nt->net;
2022 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2023 struct ip_tunnel_encap ipencap;
2024
2025 if (dev == ign->fb_tunnel_dev)
2026 return ERR_PTR(-EINVAL);
2027
2028 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2029 int err = ip6_tnl_encap_setup(nt, &ipencap);
2030
2031 if (err < 0)
2032 return ERR_PTR(err);
2033 }
2034
2035 ip6gre_netlink_parms(data, p_p);
2036
2037 t = ip6gre_tunnel_locate(net, p_p, 0);
2038
2039 if (t) {
2040 if (t->dev != dev)
2041 return ERR_PTR(-EEXIST);
2042 } else {
2043 t = nt;
2044 }
2045
2046 return t;
2047 }
2048
2049 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2050 struct nlattr *data[],
2051 struct netlink_ext_ack *extack)
2052 {
2053 struct ip6_tnl *t = netdev_priv(dev);
2054 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2055 struct __ip6_tnl_parm p;
2056
2057 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2058 if (IS_ERR(t))
2059 return PTR_ERR(t);
2060
2061 ip6gre_tunnel_unlink_md(ign, t);
2062 ip6gre_tunnel_unlink(ign, t);
2063 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2064 ip6gre_tunnel_link_md(ign, t);
2065 ip6gre_tunnel_link(ign, t);
2066 return 0;
2067 }
2068
2069 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2070 {
2071 struct net *net = dev_net(dev);
2072 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2073
2074 if (dev != ign->fb_tunnel_dev)
2075 unregister_netdevice_queue(dev, head);
2076 }
2077
2078 static size_t ip6gre_get_size(const struct net_device *dev)
2079 {
2080 return
2081 /* IFLA_GRE_LINK */
2082 nla_total_size(4) +
2083 /* IFLA_GRE_IFLAGS */
2084 nla_total_size(2) +
2085 /* IFLA_GRE_OFLAGS */
2086 nla_total_size(2) +
2087 /* IFLA_GRE_IKEY */
2088 nla_total_size(4) +
2089 /* IFLA_GRE_OKEY */
2090 nla_total_size(4) +
2091 /* IFLA_GRE_LOCAL */
2092 nla_total_size(sizeof(struct in6_addr)) +
2093 /* IFLA_GRE_REMOTE */
2094 nla_total_size(sizeof(struct in6_addr)) +
2095 /* IFLA_GRE_TTL */
2096 nla_total_size(1) +
2097 /* IFLA_GRE_ENCAP_LIMIT */
2098 nla_total_size(1) +
2099 /* IFLA_GRE_FLOWINFO */
2100 nla_total_size(4) +
2101 /* IFLA_GRE_FLAGS */
2102 nla_total_size(4) +
2103 /* IFLA_GRE_ENCAP_TYPE */
2104 nla_total_size(2) +
2105 /* IFLA_GRE_ENCAP_FLAGS */
2106 nla_total_size(2) +
2107 /* IFLA_GRE_ENCAP_SPORT */
2108 nla_total_size(2) +
2109 /* IFLA_GRE_ENCAP_DPORT */
2110 nla_total_size(2) +
2111 /* IFLA_GRE_COLLECT_METADATA */
2112 nla_total_size(0) +
2113 /* IFLA_GRE_FWMARK */
2114 nla_total_size(4) +
2115 /* IFLA_GRE_ERSPAN_INDEX */
2116 nla_total_size(4) +
2117 0;
2118 }
2119
2120 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2121 {
2122 struct ip6_tnl *t = netdev_priv(dev);
2123 struct __ip6_tnl_parm *p = &t->parms;
2124 __be16 o_flags = p->o_flags;
2125
2126 if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2127 if (!p->collect_md)
2128 o_flags |= TUNNEL_KEY;
2129
2130 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2131 goto nla_put_failure;
2132
2133 if (p->erspan_ver == 1) {
2134 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2135 goto nla_put_failure;
2136 } else {
2137 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2138 goto nla_put_failure;
2139 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2140 goto nla_put_failure;
2141 }
2142 }
2143
2144 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2145 nla_put_be16(skb, IFLA_GRE_IFLAGS,
2146 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2147 nla_put_be16(skb, IFLA_GRE_OFLAGS,
2148 gre_tnl_flags_to_gre_flags(o_flags)) ||
2149 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2150 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2151 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2152 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2153 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2154 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2155 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2156 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2157 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
2158 goto nla_put_failure;
2159
2160 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2161 t->encap.type) ||
2162 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2163 t->encap.sport) ||
2164 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2165 t->encap.dport) ||
2166 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2167 t->encap.flags))
2168 goto nla_put_failure;
2169
2170 if (p->collect_md) {
2171 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2172 goto nla_put_failure;
2173 }
2174
2175 return 0;
2176
2177 nla_put_failure:
2178 return -EMSGSIZE;
2179 }
2180
2181 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2182 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2183 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2184 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2185 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2186 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2187 [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct ipv6hdr, saddr) },
2188 [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct ipv6hdr, daddr) },
2189 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2190 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2191 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2192 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
2193 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2194 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2195 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2196 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
2197 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2198 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
2199 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2200 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2201 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2202 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
2203 };
2204
2205 static void ip6erspan_tap_setup(struct net_device *dev)
2206 {
2207 ether_setup(dev);
2208
2209 dev->max_mtu = 0;
2210 dev->netdev_ops = &ip6erspan_netdev_ops;
2211 dev->needs_free_netdev = true;
2212 dev->priv_destructor = ip6gre_dev_free;
2213
2214 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2215 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2216 netif_keep_dst(dev);
2217 }
2218
2219 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2220 struct nlattr *tb[], struct nlattr *data[],
2221 struct netlink_ext_ack *extack)
2222 {
2223 struct ip6_tnl *nt = netdev_priv(dev);
2224 struct net *net = dev_net(dev);
2225 struct ip6gre_net *ign;
2226 int err;
2227
2228 ip6gre_netlink_parms(data, &nt->parms);
2229 ip6erspan_set_version(data, &nt->parms);
2230 ign = net_generic(net, ip6gre_net_id);
2231
2232 if (nt->parms.collect_md) {
2233 if (rtnl_dereference(ign->collect_md_tun_erspan))
2234 return -EEXIST;
2235 } else {
2236 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2237 return -EEXIST;
2238 }
2239
2240 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2241 if (!err) {
2242 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2243 ip6erspan_tunnel_link_md(ign, nt);
2244 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2245 }
2246 return err;
2247 }
2248
2249 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2250 {
2251 ip6gre_tnl_link_config_common(t);
2252 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2253 }
2254
2255 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2256 const struct __ip6_tnl_parm *p, int set_mtu)
2257 {
2258 ip6gre_tnl_copy_tnl_parm(t, p);
2259 ip6erspan_tnl_link_config(t, set_mtu);
2260 return 0;
2261 }
2262
2263 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2264 struct nlattr *data[],
2265 struct netlink_ext_ack *extack)
2266 {
2267 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2268 struct __ip6_tnl_parm p;
2269 struct ip6_tnl *t;
2270
2271 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2272 if (IS_ERR(t))
2273 return PTR_ERR(t);
2274
2275 ip6erspan_set_version(data, &p);
2276 ip6gre_tunnel_unlink_md(ign, t);
2277 ip6gre_tunnel_unlink(ign, t);
2278 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2279 ip6erspan_tunnel_link_md(ign, t);
2280 ip6gre_tunnel_link(ign, t);
2281 return 0;
2282 }
2283
2284 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2285 .kind = "ip6gre",
2286 .maxtype = IFLA_GRE_MAX,
2287 .policy = ip6gre_policy,
2288 .priv_size = sizeof(struct ip6_tnl),
2289 .setup = ip6gre_tunnel_setup,
2290 .validate = ip6gre_tunnel_validate,
2291 .newlink = ip6gre_newlink,
2292 .changelink = ip6gre_changelink,
2293 .dellink = ip6gre_dellink,
2294 .get_size = ip6gre_get_size,
2295 .fill_info = ip6gre_fill_info,
2296 .get_link_net = ip6_tnl_get_link_net,
2297 };
2298
2299 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2300 .kind = "ip6gretap",
2301 .maxtype = IFLA_GRE_MAX,
2302 .policy = ip6gre_policy,
2303 .priv_size = sizeof(struct ip6_tnl),
2304 .setup = ip6gre_tap_setup,
2305 .validate = ip6gre_tap_validate,
2306 .newlink = ip6gre_newlink,
2307 .changelink = ip6gre_changelink,
2308 .get_size = ip6gre_get_size,
2309 .fill_info = ip6gre_fill_info,
2310 .get_link_net = ip6_tnl_get_link_net,
2311 };
2312
2313 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2314 .kind = "ip6erspan",
2315 .maxtype = IFLA_GRE_MAX,
2316 .policy = ip6gre_policy,
2317 .priv_size = sizeof(struct ip6_tnl),
2318 .setup = ip6erspan_tap_setup,
2319 .validate = ip6erspan_tap_validate,
2320 .newlink = ip6erspan_newlink,
2321 .changelink = ip6erspan_changelink,
2322 .get_size = ip6gre_get_size,
2323 .fill_info = ip6gre_fill_info,
2324 .get_link_net = ip6_tnl_get_link_net,
2325 };
2326
2327 /*
2328 * And now the modules code and kernel interface.
2329 */
2330
2331 static int __init ip6gre_init(void)
2332 {
2333 int err;
2334
2335 pr_info("GRE over IPv6 tunneling driver\n");
2336
2337 err = register_pernet_device(&ip6gre_net_ops);
2338 if (err < 0)
2339 return err;
2340
2341 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2342 if (err < 0) {
2343 pr_info("%s: can't add protocol\n", __func__);
2344 goto add_proto_failed;
2345 }
2346
2347 err = rtnl_link_register(&ip6gre_link_ops);
2348 if (err < 0)
2349 goto rtnl_link_failed;
2350
2351 err = rtnl_link_register(&ip6gre_tap_ops);
2352 if (err < 0)
2353 goto tap_ops_failed;
2354
2355 err = rtnl_link_register(&ip6erspan_tap_ops);
2356 if (err < 0)
2357 goto erspan_link_failed;
2358
2359 out:
2360 return err;
2361
2362 erspan_link_failed:
2363 rtnl_link_unregister(&ip6gre_tap_ops);
2364 tap_ops_failed:
2365 rtnl_link_unregister(&ip6gre_link_ops);
2366 rtnl_link_failed:
2367 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2368 add_proto_failed:
2369 unregister_pernet_device(&ip6gre_net_ops);
2370 goto out;
2371 }
2372
2373 static void __exit ip6gre_fini(void)
2374 {
2375 rtnl_link_unregister(&ip6gre_tap_ops);
2376 rtnl_link_unregister(&ip6gre_link_ops);
2377 rtnl_link_unregister(&ip6erspan_tap_ops);
2378 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2379 unregister_pernet_device(&ip6gre_net_ops);
2380 }
2381
2382 module_init(ip6gre_init);
2383 module_exit(ip6gre_fini);
2384 MODULE_LICENSE("GPL");
2385 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2386 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2387 MODULE_ALIAS_RTNL_LINK("ip6gre");
2388 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2389 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2390 MODULE_ALIAS_NETDEV("ip6gre0");
2391
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