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Linux 5.1.15
[linux/fpc-iii.git] / net / ipv6 / ip6_gre.c
blob655e46b227f9eb99e43369ffb96a411bd662eadb
1 /*
2 * GRE over IPv6 protocol decoder.
3 *
4 * Authors: Dmitry Kozlov (xeb@mail.ru)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 */
12
13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15 #include <linux/capability.h>
16 #include <linux/module.h>
17 #include <linux/types.h>
18 #include <linux/kernel.h>
19 #include <linux/slab.h>
20 #include <linux/uaccess.h>
21 #include <linux/skbuff.h>
22 #include <linux/netdevice.h>
23 #include <linux/in.h>
24 #include <linux/tcp.h>
25 #include <linux/udp.h>
26 #include <linux/if_arp.h>
27 #include <linux/init.h>
28 #include <linux/in6.h>
29 #include <linux/inetdevice.h>
30 #include <linux/igmp.h>
31 #include <linux/netfilter_ipv4.h>
32 #include <linux/etherdevice.h>
33 #include <linux/if_ether.h>
34 #include <linux/hash.h>
35 #include <linux/if_tunnel.h>
36 #include <linux/ip6_tunnel.h>
37
38 #include <net/sock.h>
39 #include <net/ip.h>
40 #include <net/ip_tunnels.h>
41 #include <net/icmp.h>
42 #include <net/protocol.h>
43 #include <net/addrconf.h>
44 #include <net/arp.h>
45 #include <net/checksum.h>
46 #include <net/dsfield.h>
47 #include <net/inet_ecn.h>
48 #include <net/xfrm.h>
49 #include <net/net_namespace.h>
50 #include <net/netns/generic.h>
51 #include <net/rtnetlink.h>
52
53 #include <net/ipv6.h>
54 #include <net/ip6_fib.h>
55 #include <net/ip6_route.h>
56 #include <net/ip6_tunnel.h>
57 #include <net/gre.h>
58 #include <net/erspan.h>
59 #include <net/dst_metadata.h>
60
61
62 static bool log_ecn_error = true;
63 module_param(log_ecn_error, bool, 0644);
64 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
65
66 #define IP6_GRE_HASH_SIZE_SHIFT 5
67 #define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
68
69 static unsigned int ip6gre_net_id __read_mostly;
70 struct ip6gre_net {
71 struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
72
73 struct ip6_tnl __rcu *collect_md_tun;
74 struct ip6_tnl __rcu *collect_md_tun_erspan;
75 struct net_device *fb_tunnel_dev;
76 };
77
78 static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
79 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
80 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly;
81 static int ip6gre_tunnel_init(struct net_device *dev);
82 static void ip6gre_tunnel_setup(struct net_device *dev);
83 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
84 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
85 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu);
86
87 /* Tunnel hash table */
88
89 /*
90 4 hash tables:
91
92 3: (remote,local)
93 2: (remote,*)
94 1: (*,local)
95 0: (*,*)
96
97 We require exact key match i.e. if a key is present in packet
98 it will match only tunnel with the same key; if it is not present,
99 it will match only keyless tunnel.
100
101 All keysless packets, if not matched configured keyless tunnels
102 will match fallback tunnel.
103 */
104
105 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
106 static u32 HASH_ADDR(const struct in6_addr *addr)
107 {
108 u32 hash = ipv6_addr_hash(addr);
109
110 return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
111 }
112
113 #define tunnels_r_l tunnels[3]
114 #define tunnels_r tunnels[2]
115 #define tunnels_l tunnels[1]
116 #define tunnels_wc tunnels[0]
117
118 /* Given src, dst and key, find appropriate for input tunnel. */
119
120 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
121 const struct in6_addr *remote, const struct in6_addr *local,
122 __be32 key, __be16 gre_proto)
123 {
124 struct net *net = dev_net(dev);
125 int link = dev->ifindex;
126 unsigned int h0 = HASH_ADDR(remote);
127 unsigned int h1 = HASH_KEY(key);
128 struct ip6_tnl *t, *cand = NULL;
129 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
130 int dev_type = (gre_proto == htons(ETH_P_TEB) ||
131 gre_proto == htons(ETH_P_ERSPAN) ||
132 gre_proto == htons(ETH_P_ERSPAN2)) ?
133 ARPHRD_ETHER : ARPHRD_IP6GRE;
134 int score, cand_score = 4;
135
136 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
137 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
138 !ipv6_addr_equal(remote, &t->parms.raddr) ||
139 key != t->parms.i_key ||
140 !(t->dev->flags & IFF_UP))
141 continue;
142
143 if (t->dev->type != ARPHRD_IP6GRE &&
144 t->dev->type != dev_type)
145 continue;
146
147 score = 0;
148 if (t->parms.link != link)
149 score |= 1;
150 if (t->dev->type != dev_type)
151 score |= 2;
152 if (score == 0)
153 return t;
154
155 if (score < cand_score) {
156 cand = t;
157 cand_score = score;
158 }
159 }
160
161 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
162 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
163 key != t->parms.i_key ||
164 !(t->dev->flags & IFF_UP))
165 continue;
166
167 if (t->dev->type != ARPHRD_IP6GRE &&
168 t->dev->type != dev_type)
169 continue;
170
171 score = 0;
172 if (t->parms.link != link)
173 score |= 1;
174 if (t->dev->type != dev_type)
175 score |= 2;
176 if (score == 0)
177 return t;
178
179 if (score < cand_score) {
180 cand = t;
181 cand_score = score;
182 }
183 }
184
185 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
186 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
187 (!ipv6_addr_equal(local, &t->parms.raddr) ||
188 !ipv6_addr_is_multicast(local))) ||
189 key != t->parms.i_key ||
190 !(t->dev->flags & IFF_UP))
191 continue;
192
193 if (t->dev->type != ARPHRD_IP6GRE &&
194 t->dev->type != dev_type)
195 continue;
196
197 score = 0;
198 if (t->parms.link != link)
199 score |= 1;
200 if (t->dev->type != dev_type)
201 score |= 2;
202 if (score == 0)
203 return t;
204
205 if (score < cand_score) {
206 cand = t;
207 cand_score = score;
208 }
209 }
210
211 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
212 if (t->parms.i_key != key ||
213 !(t->dev->flags & IFF_UP))
214 continue;
215
216 if (t->dev->type != ARPHRD_IP6GRE &&
217 t->dev->type != dev_type)
218 continue;
219
220 score = 0;
221 if (t->parms.link != link)
222 score |= 1;
223 if (t->dev->type != dev_type)
224 score |= 2;
225 if (score == 0)
226 return t;
227
228 if (score < cand_score) {
229 cand = t;
230 cand_score = score;
231 }
232 }
233
234 if (cand)
235 return cand;
236
237 if (gre_proto == htons(ETH_P_ERSPAN) ||
238 gre_proto == htons(ETH_P_ERSPAN2))
239 t = rcu_dereference(ign->collect_md_tun_erspan);
240 else
241 t = rcu_dereference(ign->collect_md_tun);
242
243 if (t && t->dev->flags & IFF_UP)
244 return t;
245
246 dev = ign->fb_tunnel_dev;
247 if (dev && dev->flags & IFF_UP)
248 return netdev_priv(dev);
249
250 return NULL;
251 }
252
253 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
254 const struct __ip6_tnl_parm *p)
255 {
256 const struct in6_addr *remote = &p->raddr;
257 const struct in6_addr *local = &p->laddr;
258 unsigned int h = HASH_KEY(p->i_key);
259 int prio = 0;
260
261 if (!ipv6_addr_any(local))
262 prio |= 1;
263 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
264 prio |= 2;
265 h ^= HASH_ADDR(remote);
266 }
267
268 return &ign->tunnels[prio][h];
269 }
270
271 static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
272 {
273 if (t->parms.collect_md)
274 rcu_assign_pointer(ign->collect_md_tun, t);
275 }
276
277 static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
278 {
279 if (t->parms.collect_md)
280 rcu_assign_pointer(ign->collect_md_tun_erspan, t);
281 }
282
283 static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t)
284 {
285 if (t->parms.collect_md)
286 rcu_assign_pointer(ign->collect_md_tun, NULL);
287 }
288
289 static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign,
290 struct ip6_tnl *t)
291 {
292 if (t->parms.collect_md)
293 rcu_assign_pointer(ign->collect_md_tun_erspan, NULL);
294 }
295
296 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
297 const struct ip6_tnl *t)
298 {
299 return __ip6gre_bucket(ign, &t->parms);
300 }
301
302 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
303 {
304 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
305
306 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
307 rcu_assign_pointer(*tp, t);
308 }
309
310 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
311 {
312 struct ip6_tnl __rcu **tp;
313 struct ip6_tnl *iter;
314
315 for (tp = ip6gre_bucket(ign, t);
316 (iter = rtnl_dereference(*tp)) != NULL;
317 tp = &iter->next) {
318 if (t == iter) {
319 rcu_assign_pointer(*tp, t->next);
320 break;
321 }
322 }
323 }
324
325 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
326 const struct __ip6_tnl_parm *parms,
327 int type)
328 {
329 const struct in6_addr *remote = &parms->raddr;
330 const struct in6_addr *local = &parms->laddr;
331 __be32 key = parms->i_key;
332 int link = parms->link;
333 struct ip6_tnl *t;
334 struct ip6_tnl __rcu **tp;
335 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
336
337 for (tp = __ip6gre_bucket(ign, parms);
338 (t = rtnl_dereference(*tp)) != NULL;
339 tp = &t->next)
340 if (ipv6_addr_equal(local, &t->parms.laddr) &&
341 ipv6_addr_equal(remote, &t->parms.raddr) &&
342 key == t->parms.i_key &&
343 link == t->parms.link &&
344 type == t->dev->type)
345 break;
346
347 return t;
348 }
349
350 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
351 const struct __ip6_tnl_parm *parms, int create)
352 {
353 struct ip6_tnl *t, *nt;
354 struct net_device *dev;
355 char name[IFNAMSIZ];
356 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
357
358 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
359 if (t && create)
360 return NULL;
361 if (t || !create)
362 return t;
363
364 if (parms->name[0]) {
365 if (!dev_valid_name(parms->name))
366 return NULL;
367 strlcpy(name, parms->name, IFNAMSIZ);
368 } else {
369 strcpy(name, "ip6gre%d");
370 }
371 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
372 ip6gre_tunnel_setup);
373 if (!dev)
374 return NULL;
375
376 dev_net_set(dev, net);
377
378 nt = netdev_priv(dev);
379 nt->parms = *parms;
380 dev->rtnl_link_ops = &ip6gre_link_ops;
381
382 nt->dev = dev;
383 nt->net = dev_net(dev);
384
385 if (register_netdevice(dev) < 0)
386 goto failed_free;
387
388 ip6gre_tnl_link_config(nt, 1);
389
390 /* Can use a lockless transmit, unless we generate output sequences */
391 if (!(nt->parms.o_flags & TUNNEL_SEQ))
392 dev->features |= NETIF_F_LLTX;
393
394 dev_hold(dev);
395 ip6gre_tunnel_link(ign, nt);
396 return nt;
397
398 failed_free:
399 free_netdev(dev);
400 return NULL;
401 }
402
403 static void ip6erspan_tunnel_uninit(struct net_device *dev)
404 {
405 struct ip6_tnl *t = netdev_priv(dev);
406 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
407
408 ip6erspan_tunnel_unlink_md(ign, t);
409 ip6gre_tunnel_unlink(ign, t);
410 dst_cache_reset(&t->dst_cache);
411 dev_put(dev);
412 }
413
414 static void ip6gre_tunnel_uninit(struct net_device *dev)
415 {
416 struct ip6_tnl *t = netdev_priv(dev);
417 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
418
419 ip6gre_tunnel_unlink_md(ign, t);
420 ip6gre_tunnel_unlink(ign, t);
421 dst_cache_reset(&t->dst_cache);
422 dev_put(dev);
423 }
424
425
426 static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
427 u8 type, u8 code, int offset, __be32 info)
428 {
429 struct net *net = dev_net(skb->dev);
430 const struct ipv6hdr *ipv6h;
431 struct tnl_ptk_info tpi;
432 struct ip6_tnl *t;
433
434 if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6),
435 offset) < 0)
436 return -EINVAL;
437
438 ipv6h = (const struct ipv6hdr *)skb->data;
439 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
440 tpi.key, tpi.proto);
441 if (!t)
442 return -ENOENT;
443
444 switch (type) {
445 struct ipv6_tlv_tnl_enc_lim *tel;
446 __u32 teli;
447 case ICMPV6_DEST_UNREACH:
448 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
449 t->parms.name);
450 if (code != ICMPV6_PORT_UNREACH)
451 break;
452 return 0;
453 case ICMPV6_TIME_EXCEED:
454 if (code == ICMPV6_EXC_HOPLIMIT) {
455 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
456 t->parms.name);
457 break;
458 }
459 return 0;
460 case ICMPV6_PARAMPROB:
461 teli = 0;
462 if (code == ICMPV6_HDR_FIELD)
463 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
464
465 if (teli && teli == be32_to_cpu(info) - 2) {
466 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
467 if (tel->encap_limit == 0) {
468 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
469 t->parms.name);
470 }
471 } else {
472 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
473 t->parms.name);
474 }
475 return 0;
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 = ipv6_hdr(skb);
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
675 if (offset > 0) {
676 struct ipv6_tlv_tnl_enc_lim *tel;
677
678 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
679 if (tel->encap_limit == 0) {
680 icmpv6_send(skb, ICMPV6_PARAMPROB,
681 ICMPV6_HDR_FIELD, offset + 2);
682 return -1;
683 }
684 *encap_limit = tel->encap_limit - 1;
685 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
686 *encap_limit = t->parms.encap_limit;
687 }
688
689 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
690
691 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
692 *dsfield = ipv6_get_dsfield(ipv6h);
693 else
694 *dsfield = ip6_tclass(t->parms.flowinfo);
695
696 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
697 fl6->flowlabel |= ip6_flowlabel(ipv6h);
698
699 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
700 fl6->flowi6_mark = skb->mark;
701 else
702 fl6->flowi6_mark = t->parms.fwmark;
703
704 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
705
706 return 0;
707 }
708
709 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
710 struct net_device *dev, __u8 dsfield,
711 struct flowi6 *fl6, int encap_limit,
712 __u32 *pmtu, __be16 proto)
713 {
714 struct ip6_tnl *tunnel = netdev_priv(dev);
715 __be16 protocol;
716
717 if (dev->type == ARPHRD_ETHER)
718 IPCB(skb)->flags = 0;
719
720 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
721 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
722 else
723 fl6->daddr = tunnel->parms.raddr;
724
725 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
726 return -ENOMEM;
727
728 /* Push GRE header. */
729 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
730
731 if (tunnel->parms.collect_md) {
732 struct ip_tunnel_info *tun_info;
733 const struct ip_tunnel_key *key;
734 __be16 flags;
735
736 tun_info = skb_tunnel_info(skb);
737 if (unlikely(!tun_info ||
738 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
739 ip_tunnel_info_af(tun_info) != AF_INET6))
740 return -EINVAL;
741
742 key = &tun_info->key;
743 memset(fl6, 0, sizeof(*fl6));
744 fl6->flowi6_proto = IPPROTO_GRE;
745 fl6->daddr = key->u.ipv6.dst;
746 fl6->flowlabel = key->label;
747 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
748
749 dsfield = key->tos;
750 flags = key->tun_flags &
751 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
752 tunnel->tun_hlen = gre_calc_hlen(flags);
753
754 gre_build_header(skb, tunnel->tun_hlen,
755 flags, protocol,
756 tunnel_id_to_key32(tun_info->key.tun_id),
757 (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++)
758 : 0);
759
760 } else {
761 if (tunnel->parms.o_flags & TUNNEL_SEQ)
762 tunnel->o_seqno++;
763
764 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
765 protocol, tunnel->parms.o_key,
766 htonl(tunnel->o_seqno));
767 }
768
769 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
770 NEXTHDR_GRE);
771 }
772
773 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
774 {
775 struct ip6_tnl *t = netdev_priv(dev);
776 int encap_limit = -1;
777 struct flowi6 fl6;
778 __u8 dsfield = 0;
779 __u32 mtu;
780 int err;
781
782 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
783
784 if (!t->parms.collect_md)
785 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
786 &dsfield, &encap_limit);
787
788 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
789 if (err)
790 return -1;
791
792 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
793 skb->protocol);
794 if (err != 0) {
795 /* XXX: send ICMP error even if DF is not set. */
796 if (err == -EMSGSIZE)
797 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
798 htonl(mtu));
799 return -1;
800 }
801
802 return 0;
803 }
804
805 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
806 {
807 struct ip6_tnl *t = netdev_priv(dev);
808 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
809 int encap_limit = -1;
810 struct flowi6 fl6;
811 __u8 dsfield = 0;
812 __u32 mtu;
813 int err;
814
815 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
816 return -1;
817
818 if (!t->parms.collect_md &&
819 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
820 return -1;
821
822 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
823 return -1;
824
825 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
826 &mtu, skb->protocol);
827 if (err != 0) {
828 if (err == -EMSGSIZE)
829 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
830 return -1;
831 }
832
833 return 0;
834 }
835
836 /**
837 * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own
838 * @t: the outgoing tunnel device
839 * @hdr: IPv6 header from the incoming packet
840 *
841 * Description:
842 * Avoid trivial tunneling loop by checking that tunnel exit-point
843 * doesn't match source of incoming packet.
844 *
845 * Return:
846 * 1 if conflict,
847 * 0 else
848 **/
849
850 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
851 const struct ipv6hdr *hdr)
852 {
853 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
854 }
855
856 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
857 {
858 struct ip6_tnl *t = netdev_priv(dev);
859 int encap_limit = -1;
860 struct flowi6 fl6;
861 __u32 mtu;
862 int err;
863
864 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
865 encap_limit = t->parms.encap_limit;
866
867 if (!t->parms.collect_md)
868 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
869
870 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
871 if (err)
872 return err;
873
874 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
875
876 return err;
877 }
878
879 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
880 struct net_device *dev)
881 {
882 struct ip6_tnl *t = netdev_priv(dev);
883 struct net_device_stats *stats = &t->dev->stats;
884 int ret;
885
886 if (!pskb_inet_may_pull(skb))
887 goto tx_err;
888
889 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
890 goto tx_err;
891
892 switch (skb->protocol) {
893 case htons(ETH_P_IP):
894 ret = ip6gre_xmit_ipv4(skb, dev);
895 break;
896 case htons(ETH_P_IPV6):
897 ret = ip6gre_xmit_ipv6(skb, dev);
898 break;
899 default:
900 ret = ip6gre_xmit_other(skb, dev);
901 break;
902 }
903
904 if (ret < 0)
905 goto tx_err;
906
907 return NETDEV_TX_OK;
908
909 tx_err:
910 stats->tx_errors++;
911 stats->tx_dropped++;
912 kfree_skb(skb);
913 return NETDEV_TX_OK;
914 }
915
916 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
917 struct net_device *dev)
918 {
919 struct ip6_tnl *t = netdev_priv(dev);
920 struct dst_entry *dst = skb_dst(skb);
921 struct net_device_stats *stats;
922 bool truncate = false;
923 int encap_limit = -1;
924 __u8 dsfield = false;
925 struct flowi6 fl6;
926 int err = -EINVAL;
927 __be16 proto;
928 __u32 mtu;
929 int nhoff;
930 int thoff;
931
932 if (!pskb_inet_may_pull(skb))
933 goto tx_err;
934
935 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
936 goto tx_err;
937
938 if (gre_handle_offloads(skb, false))
939 goto tx_err;
940
941 if (skb->len > dev->mtu + dev->hard_header_len) {
942 pskb_trim(skb, dev->mtu + dev->hard_header_len);
943 truncate = true;
944 }
945
946 nhoff = skb_network_header(skb) - skb_mac_header(skb);
947 if (skb->protocol == htons(ETH_P_IP) &&
948 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
949 truncate = true;
950
951 thoff = skb_transport_header(skb) - skb_mac_header(skb);
952 if (skb->protocol == htons(ETH_P_IPV6) &&
953 (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff))
954 truncate = true;
955
956 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
957 goto tx_err;
958
959 t->parms.o_flags &= ~TUNNEL_KEY;
960 IPCB(skb)->flags = 0;
961
962 /* For collect_md mode, derive fl6 from the tunnel key,
963 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
964 */
965 if (t->parms.collect_md) {
966 struct ip_tunnel_info *tun_info;
967 const struct ip_tunnel_key *key;
968 struct erspan_metadata *md;
969 __be32 tun_id;
970
971 tun_info = skb_tunnel_info(skb);
972 if (unlikely(!tun_info ||
973 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
974 ip_tunnel_info_af(tun_info) != AF_INET6))
975 return -EINVAL;
976
977 key = &tun_info->key;
978 memset(&fl6, 0, sizeof(fl6));
979 fl6.flowi6_proto = IPPROTO_GRE;
980 fl6.daddr = key->u.ipv6.dst;
981 fl6.flowlabel = key->label;
982 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
983
984 dsfield = key->tos;
985 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
986 goto tx_err;
987 md = ip_tunnel_info_opts(tun_info);
988 if (!md)
989 goto tx_err;
990
991 tun_id = tunnel_id_to_key32(key->tun_id);
992 if (md->version == 1) {
993 erspan_build_header(skb,
994 ntohl(tun_id),
995 ntohl(md->u.index), truncate,
996 false);
997 } else if (md->version == 2) {
998 erspan_build_header_v2(skb,
999 ntohl(tun_id),
1000 md->u.md2.dir,
1001 get_hwid(&md->u.md2),
1002 truncate, false);
1003 } else {
1004 goto tx_err;
1005 }
1006 } else {
1007 switch (skb->protocol) {
1008 case htons(ETH_P_IP):
1009 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1010 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1011 &dsfield, &encap_limit);
1012 break;
1013 case htons(ETH_P_IPV6):
1014 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1015 goto tx_err;
1016 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1017 &dsfield, &encap_limit))
1018 goto tx_err;
1019 break;
1020 default:
1021 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1022 break;
1023 }
1024
1025 if (t->parms.erspan_ver == 1)
1026 erspan_build_header(skb, ntohl(t->parms.o_key),
1027 t->parms.index,
1028 truncate, false);
1029 else if (t->parms.erspan_ver == 2)
1030 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1031 t->parms.dir,
1032 t->parms.hwid,
1033 truncate, false);
1034 else
1035 goto tx_err;
1036
1037 fl6.daddr = t->parms.raddr;
1038 }
1039
1040 /* Push GRE header. */
1041 proto = (t->parms.erspan_ver == 1) ? htons(ETH_P_ERSPAN)
1042 : htons(ETH_P_ERSPAN2);
1043 gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(t->o_seqno++));
1044
1045 /* TooBig packet may have updated dst->dev's mtu */
1046 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1047 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu);
1048
1049 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1050 NEXTHDR_GRE);
1051 if (err != 0) {
1052 /* XXX: send ICMP error even if DF is not set. */
1053 if (err == -EMSGSIZE) {
1054 if (skb->protocol == htons(ETH_P_IP))
1055 icmp_send(skb, ICMP_DEST_UNREACH,
1056 ICMP_FRAG_NEEDED, htonl(mtu));
1057 else
1058 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1059 }
1060
1061 goto tx_err;
1062 }
1063 return NETDEV_TX_OK;
1064
1065 tx_err:
1066 stats = &t->dev->stats;
1067 stats->tx_errors++;
1068 stats->tx_dropped++;
1069 kfree_skb(skb);
1070 return NETDEV_TX_OK;
1071 }
1072
1073 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1074 {
1075 struct net_device *dev = t->dev;
1076 struct __ip6_tnl_parm *p = &t->parms;
1077 struct flowi6 *fl6 = &t->fl.u.ip6;
1078
1079 if (dev->type != ARPHRD_ETHER) {
1080 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1081 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1082 }
1083
1084 /* Set up flowi template */
1085 fl6->saddr = p->laddr;
1086 fl6->daddr = p->raddr;
1087 fl6->flowi6_oif = p->link;
1088 fl6->flowlabel = 0;
1089 fl6->flowi6_proto = IPPROTO_GRE;
1090
1091 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1092 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1093 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1094 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1095
1096 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1097 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1098
1099 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1100 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1101 dev->flags |= IFF_POINTOPOINT;
1102 else
1103 dev->flags &= ~IFF_POINTOPOINT;
1104 }
1105
1106 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1107 int t_hlen)
1108 {
1109 const struct __ip6_tnl_parm *p = &t->parms;
1110 struct net_device *dev = t->dev;
1111
1112 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1113 int strict = (ipv6_addr_type(&p->raddr) &
1114 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1115
1116 struct rt6_info *rt = rt6_lookup(t->net,
1117 &p->raddr, &p->laddr,
1118 p->link, NULL, strict);
1119
1120 if (!rt)
1121 return;
1122
1123 if (rt->dst.dev) {
1124 dev->needed_headroom = rt->dst.dev->hard_header_len +
1125 t_hlen;
1126
1127 if (set_mtu) {
1128 dev->mtu = rt->dst.dev->mtu - t_hlen;
1129 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1130 dev->mtu -= 8;
1131 if (dev->type == ARPHRD_ETHER)
1132 dev->mtu -= ETH_HLEN;
1133
1134 if (dev->mtu < IPV6_MIN_MTU)
1135 dev->mtu = IPV6_MIN_MTU;
1136 }
1137 }
1138 ip6_rt_put(rt);
1139 }
1140 }
1141
1142 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1143 {
1144 int t_hlen;
1145
1146 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1147 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1148
1149 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1150 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1151 return t_hlen;
1152 }
1153
1154 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1155 {
1156 ip6gre_tnl_link_config_common(t);
1157 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1158 }
1159
1160 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1161 const struct __ip6_tnl_parm *p)
1162 {
1163 t->parms.laddr = p->laddr;
1164 t->parms.raddr = p->raddr;
1165 t->parms.flags = p->flags;
1166 t->parms.hop_limit = p->hop_limit;
1167 t->parms.encap_limit = p->encap_limit;
1168 t->parms.flowinfo = p->flowinfo;
1169 t->parms.link = p->link;
1170 t->parms.proto = p->proto;
1171 t->parms.i_key = p->i_key;
1172 t->parms.o_key = p->o_key;
1173 t->parms.i_flags = p->i_flags;
1174 t->parms.o_flags = p->o_flags;
1175 t->parms.fwmark = p->fwmark;
1176 t->parms.erspan_ver = p->erspan_ver;
1177 t->parms.index = p->index;
1178 t->parms.dir = p->dir;
1179 t->parms.hwid = p->hwid;
1180 dst_cache_reset(&t->dst_cache);
1181 }
1182
1183 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1184 int set_mtu)
1185 {
1186 ip6gre_tnl_copy_tnl_parm(t, p);
1187 ip6gre_tnl_link_config(t, set_mtu);
1188 return 0;
1189 }
1190
1191 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1192 const struct ip6_tnl_parm2 *u)
1193 {
1194 p->laddr = u->laddr;
1195 p->raddr = u->raddr;
1196 p->flags = u->flags;
1197 p->hop_limit = u->hop_limit;
1198 p->encap_limit = u->encap_limit;
1199 p->flowinfo = u->flowinfo;
1200 p->link = u->link;
1201 p->i_key = u->i_key;
1202 p->o_key = u->o_key;
1203 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1204 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1205 memcpy(p->name, u->name, sizeof(u->name));
1206 }
1207
1208 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1209 const struct __ip6_tnl_parm *p)
1210 {
1211 u->proto = IPPROTO_GRE;
1212 u->laddr = p->laddr;
1213 u->raddr = p->raddr;
1214 u->flags = p->flags;
1215 u->hop_limit = p->hop_limit;
1216 u->encap_limit = p->encap_limit;
1217 u->flowinfo = p->flowinfo;
1218 u->link = p->link;
1219 u->i_key = p->i_key;
1220 u->o_key = p->o_key;
1221 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1222 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1223 memcpy(u->name, p->name, sizeof(u->name));
1224 }
1225
1226 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1227 struct ifreq *ifr, int cmd)
1228 {
1229 int err = 0;
1230 struct ip6_tnl_parm2 p;
1231 struct __ip6_tnl_parm p1;
1232 struct ip6_tnl *t = netdev_priv(dev);
1233 struct net *net = t->net;
1234 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1235
1236 memset(&p1, 0, sizeof(p1));
1237
1238 switch (cmd) {
1239 case SIOCGETTUNNEL:
1240 if (dev == ign->fb_tunnel_dev) {
1241 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1242 err = -EFAULT;
1243 break;
1244 }
1245 ip6gre_tnl_parm_from_user(&p1, &p);
1246 t = ip6gre_tunnel_locate(net, &p1, 0);
1247 if (!t)
1248 t = netdev_priv(dev);
1249 }
1250 memset(&p, 0, sizeof(p));
1251 ip6gre_tnl_parm_to_user(&p, &t->parms);
1252 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1253 err = -EFAULT;
1254 break;
1255
1256 case SIOCADDTUNNEL:
1257 case SIOCCHGTUNNEL:
1258 err = -EPERM;
1259 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1260 goto done;
1261
1262 err = -EFAULT;
1263 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1264 goto done;
1265
1266 err = -EINVAL;
1267 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1268 goto done;
1269
1270 if (!(p.i_flags&GRE_KEY))
1271 p.i_key = 0;
1272 if (!(p.o_flags&GRE_KEY))
1273 p.o_key = 0;
1274
1275 ip6gre_tnl_parm_from_user(&p1, &p);
1276 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1277
1278 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1279 if (t) {
1280 if (t->dev != dev) {
1281 err = -EEXIST;
1282 break;
1283 }
1284 } else {
1285 t = netdev_priv(dev);
1286
1287 ip6gre_tunnel_unlink(ign, t);
1288 synchronize_net();
1289 ip6gre_tnl_change(t, &p1, 1);
1290 ip6gre_tunnel_link(ign, t);
1291 netdev_state_change(dev);
1292 }
1293 }
1294
1295 if (t) {
1296 err = 0;
1297
1298 memset(&p, 0, sizeof(p));
1299 ip6gre_tnl_parm_to_user(&p, &t->parms);
1300 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1301 err = -EFAULT;
1302 } else
1303 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1304 break;
1305
1306 case SIOCDELTUNNEL:
1307 err = -EPERM;
1308 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1309 goto done;
1310
1311 if (dev == ign->fb_tunnel_dev) {
1312 err = -EFAULT;
1313 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1314 goto done;
1315 err = -ENOENT;
1316 ip6gre_tnl_parm_from_user(&p1, &p);
1317 t = ip6gre_tunnel_locate(net, &p1, 0);
1318 if (!t)
1319 goto done;
1320 err = -EPERM;
1321 if (t == netdev_priv(ign->fb_tunnel_dev))
1322 goto done;
1323 dev = t->dev;
1324 }
1325 unregister_netdevice(dev);
1326 err = 0;
1327 break;
1328
1329 default:
1330 err = -EINVAL;
1331 }
1332
1333 done:
1334 return err;
1335 }
1336
1337 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1338 unsigned short type, const void *daddr,
1339 const void *saddr, unsigned int len)
1340 {
1341 struct ip6_tnl *t = netdev_priv(dev);
1342 struct ipv6hdr *ipv6h;
1343 __be16 *p;
1344
1345 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1346 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1347 t->fl.u.ip6.flowlabel,
1348 true, &t->fl.u.ip6));
1349 ipv6h->hop_limit = t->parms.hop_limit;
1350 ipv6h->nexthdr = NEXTHDR_GRE;
1351 ipv6h->saddr = t->parms.laddr;
1352 ipv6h->daddr = t->parms.raddr;
1353
1354 p = (__be16 *)(ipv6h + 1);
1355 p[0] = t->parms.o_flags;
1356 p[1] = htons(type);
1357
1358 /*
1359 * Set the source hardware address.
1360 */
1361
1362 if (saddr)
1363 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1364 if (daddr)
1365 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1366 if (!ipv6_addr_any(&ipv6h->daddr))
1367 return t->hlen;
1368
1369 return -t->hlen;
1370 }
1371
1372 static const struct header_ops ip6gre_header_ops = {
1373 .create = ip6gre_header,
1374 };
1375
1376 static const struct net_device_ops ip6gre_netdev_ops = {
1377 .ndo_init = ip6gre_tunnel_init,
1378 .ndo_uninit = ip6gre_tunnel_uninit,
1379 .ndo_start_xmit = ip6gre_tunnel_xmit,
1380 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1381 .ndo_change_mtu = ip6_tnl_change_mtu,
1382 .ndo_get_stats64 = ip_tunnel_get_stats64,
1383 .ndo_get_iflink = ip6_tnl_get_iflink,
1384 };
1385
1386 static void ip6gre_dev_free(struct net_device *dev)
1387 {
1388 struct ip6_tnl *t = netdev_priv(dev);
1389
1390 gro_cells_destroy(&t->gro_cells);
1391 dst_cache_destroy(&t->dst_cache);
1392 free_percpu(dev->tstats);
1393 }
1394
1395 static void ip6gre_tunnel_setup(struct net_device *dev)
1396 {
1397 dev->netdev_ops = &ip6gre_netdev_ops;
1398 dev->needs_free_netdev = true;
1399 dev->priv_destructor = ip6gre_dev_free;
1400
1401 dev->type = ARPHRD_IP6GRE;
1402
1403 dev->flags |= IFF_NOARP;
1404 dev->addr_len = sizeof(struct in6_addr);
1405 netif_keep_dst(dev);
1406 /* This perm addr will be used as interface identifier by IPv6 */
1407 dev->addr_assign_type = NET_ADDR_RANDOM;
1408 eth_random_addr(dev->perm_addr);
1409 }
1410
1411 #define GRE6_FEATURES (NETIF_F_SG | \
1412 NETIF_F_FRAGLIST | \
1413 NETIF_F_HIGHDMA | \
1414 NETIF_F_HW_CSUM)
1415
1416 static void ip6gre_tnl_init_features(struct net_device *dev)
1417 {
1418 struct ip6_tnl *nt = netdev_priv(dev);
1419
1420 dev->features |= GRE6_FEATURES;
1421 dev->hw_features |= GRE6_FEATURES;
1422
1423 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1424 /* TCP offload with GRE SEQ is not supported, nor
1425 * can we support 2 levels of outer headers requiring
1426 * an update.
1427 */
1428 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1429 nt->encap.type == TUNNEL_ENCAP_NONE) {
1430 dev->features |= NETIF_F_GSO_SOFTWARE;
1431 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1432 }
1433
1434 /* Can use a lockless transmit, unless we generate
1435 * output sequences
1436 */
1437 dev->features |= NETIF_F_LLTX;
1438 }
1439 }
1440
1441 static int ip6gre_tunnel_init_common(struct net_device *dev)
1442 {
1443 struct ip6_tnl *tunnel;
1444 int ret;
1445 int t_hlen;
1446
1447 tunnel = netdev_priv(dev);
1448
1449 tunnel->dev = dev;
1450 tunnel->net = dev_net(dev);
1451 strcpy(tunnel->parms.name, dev->name);
1452
1453 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1454 if (!dev->tstats)
1455 return -ENOMEM;
1456
1457 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1458 if (ret)
1459 goto cleanup_alloc_pcpu_stats;
1460
1461 ret = gro_cells_init(&tunnel->gro_cells, dev);
1462 if (ret)
1463 goto cleanup_dst_cache_init;
1464
1465 t_hlen = ip6gre_calc_hlen(tunnel);
1466 dev->mtu = ETH_DATA_LEN - t_hlen;
1467 if (dev->type == ARPHRD_ETHER)
1468 dev->mtu -= ETH_HLEN;
1469 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1470 dev->mtu -= 8;
1471
1472 if (tunnel->parms.collect_md) {
1473 dev->features |= NETIF_F_NETNS_LOCAL;
1474 netif_keep_dst(dev);
1475 }
1476 ip6gre_tnl_init_features(dev);
1477
1478 return 0;
1479
1480 cleanup_dst_cache_init:
1481 dst_cache_destroy(&tunnel->dst_cache);
1482 cleanup_alloc_pcpu_stats:
1483 free_percpu(dev->tstats);
1484 dev->tstats = NULL;
1485 return ret;
1486 }
1487
1488 static int ip6gre_tunnel_init(struct net_device *dev)
1489 {
1490 struct ip6_tnl *tunnel;
1491 int ret;
1492
1493 ret = ip6gre_tunnel_init_common(dev);
1494 if (ret)
1495 return ret;
1496
1497 tunnel = netdev_priv(dev);
1498
1499 if (tunnel->parms.collect_md)
1500 return 0;
1501
1502 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1503 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1504
1505 if (ipv6_addr_any(&tunnel->parms.raddr))
1506 dev->header_ops = &ip6gre_header_ops;
1507
1508 return 0;
1509 }
1510
1511 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1512 {
1513 struct ip6_tnl *tunnel = netdev_priv(dev);
1514
1515 tunnel->dev = dev;
1516 tunnel->net = dev_net(dev);
1517 strcpy(tunnel->parms.name, dev->name);
1518
1519 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1520
1521 dev_hold(dev);
1522 }
1523
1524 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1525 .handler = gre_rcv,
1526 .err_handler = ip6gre_err,
1527 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1528 };
1529
1530 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1531 {
1532 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1533 struct net_device *dev, *aux;
1534 int prio;
1535
1536 for_each_netdev_safe(net, dev, aux)
1537 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1538 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1539 dev->rtnl_link_ops == &ip6erspan_tap_ops)
1540 unregister_netdevice_queue(dev, head);
1541
1542 for (prio = 0; prio < 4; prio++) {
1543 int h;
1544 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1545 struct ip6_tnl *t;
1546
1547 t = rtnl_dereference(ign->tunnels[prio][h]);
1548
1549 while (t) {
1550 /* If dev is in the same netns, it has already
1551 * been added to the list by the previous loop.
1552 */
1553 if (!net_eq(dev_net(t->dev), net))
1554 unregister_netdevice_queue(t->dev,
1555 head);
1556 t = rtnl_dereference(t->next);
1557 }
1558 }
1559 }
1560 }
1561
1562 static int __net_init ip6gre_init_net(struct net *net)
1563 {
1564 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1565 int err;
1566
1567 if (!net_has_fallback_tunnels(net))
1568 return 0;
1569 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1570 NET_NAME_UNKNOWN,
1571 ip6gre_tunnel_setup);
1572 if (!ign->fb_tunnel_dev) {
1573 err = -ENOMEM;
1574 goto err_alloc_dev;
1575 }
1576 dev_net_set(ign->fb_tunnel_dev, net);
1577 /* FB netdevice is special: we have one, and only one per netns.
1578 * Allowing to move it to another netns is clearly unsafe.
1579 */
1580 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1581
1582
1583 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1584 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1585
1586 err = register_netdev(ign->fb_tunnel_dev);
1587 if (err)
1588 goto err_reg_dev;
1589
1590 rcu_assign_pointer(ign->tunnels_wc[0],
1591 netdev_priv(ign->fb_tunnel_dev));
1592 return 0;
1593
1594 err_reg_dev:
1595 free_netdev(ign->fb_tunnel_dev);
1596 err_alloc_dev:
1597 return err;
1598 }
1599
1600 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1601 {
1602 struct net *net;
1603 LIST_HEAD(list);
1604
1605 rtnl_lock();
1606 list_for_each_entry(net, net_list, exit_list)
1607 ip6gre_destroy_tunnels(net, &list);
1608 unregister_netdevice_many(&list);
1609 rtnl_unlock();
1610 }
1611
1612 static struct pernet_operations ip6gre_net_ops = {
1613 .init = ip6gre_init_net,
1614 .exit_batch = ip6gre_exit_batch_net,
1615 .id = &ip6gre_net_id,
1616 .size = sizeof(struct ip6gre_net),
1617 };
1618
1619 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1620 struct netlink_ext_ack *extack)
1621 {
1622 __be16 flags;
1623
1624 if (!data)
1625 return 0;
1626
1627 flags = 0;
1628 if (data[IFLA_GRE_IFLAGS])
1629 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1630 if (data[IFLA_GRE_OFLAGS])
1631 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1632 if (flags & (GRE_VERSION|GRE_ROUTING))
1633 return -EINVAL;
1634
1635 return 0;
1636 }
1637
1638 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1639 struct netlink_ext_ack *extack)
1640 {
1641 struct in6_addr daddr;
1642
1643 if (tb[IFLA_ADDRESS]) {
1644 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1645 return -EINVAL;
1646 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1647 return -EADDRNOTAVAIL;
1648 }
1649
1650 if (!data)
1651 goto out;
1652
1653 if (data[IFLA_GRE_REMOTE]) {
1654 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1655 if (ipv6_addr_any(&daddr))
1656 return -EINVAL;
1657 }
1658
1659 out:
1660 return ip6gre_tunnel_validate(tb, data, extack);
1661 }
1662
1663 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1664 struct netlink_ext_ack *extack)
1665 {
1666 __be16 flags = 0;
1667 int ret, ver = 0;
1668
1669 if (!data)
1670 return 0;
1671
1672 ret = ip6gre_tap_validate(tb, data, extack);
1673 if (ret)
1674 return ret;
1675
1676 /* ERSPAN should only have GRE sequence and key flag */
1677 if (data[IFLA_GRE_OFLAGS])
1678 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1679 if (data[IFLA_GRE_IFLAGS])
1680 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1681 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1682 flags != (GRE_SEQ | GRE_KEY))
1683 return -EINVAL;
1684
1685 /* ERSPAN Session ID only has 10-bit. Since we reuse
1686 * 32-bit key field as ID, check it's range.
1687 */
1688 if (data[IFLA_GRE_IKEY] &&
1689 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1690 return -EINVAL;
1691
1692 if (data[IFLA_GRE_OKEY] &&
1693 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1694 return -EINVAL;
1695
1696 if (data[IFLA_GRE_ERSPAN_VER]) {
1697 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1698 if (ver != 1 && ver != 2)
1699 return -EINVAL;
1700 }
1701
1702 if (ver == 1) {
1703 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1704 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1705
1706 if (index & ~INDEX_MASK)
1707 return -EINVAL;
1708 }
1709 } else if (ver == 2) {
1710 if (data[IFLA_GRE_ERSPAN_DIR]) {
1711 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1712
1713 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1714 return -EINVAL;
1715 }
1716
1717 if (data[IFLA_GRE_ERSPAN_HWID]) {
1718 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1719
1720 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1721 return -EINVAL;
1722 }
1723 }
1724
1725 return 0;
1726 }
1727
1728 static void ip6erspan_set_version(struct nlattr *data[],
1729 struct __ip6_tnl_parm *parms)
1730 {
1731 if (!data)
1732 return;
1733
1734 parms->erspan_ver = 1;
1735 if (data[IFLA_GRE_ERSPAN_VER])
1736 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1737
1738 if (parms->erspan_ver == 1) {
1739 if (data[IFLA_GRE_ERSPAN_INDEX])
1740 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1741 } else if (parms->erspan_ver == 2) {
1742 if (data[IFLA_GRE_ERSPAN_DIR])
1743 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1744 if (data[IFLA_GRE_ERSPAN_HWID])
1745 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1746 }
1747 }
1748
1749 static void ip6gre_netlink_parms(struct nlattr *data[],
1750 struct __ip6_tnl_parm *parms)
1751 {
1752 memset(parms, 0, sizeof(*parms));
1753
1754 if (!data)
1755 return;
1756
1757 if (data[IFLA_GRE_LINK])
1758 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1759
1760 if (data[IFLA_GRE_IFLAGS])
1761 parms->i_flags = gre_flags_to_tnl_flags(
1762 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1763
1764 if (data[IFLA_GRE_OFLAGS])
1765 parms->o_flags = gre_flags_to_tnl_flags(
1766 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1767
1768 if (data[IFLA_GRE_IKEY])
1769 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1770
1771 if (data[IFLA_GRE_OKEY])
1772 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1773
1774 if (data[IFLA_GRE_LOCAL])
1775 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1776
1777 if (data[IFLA_GRE_REMOTE])
1778 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1779
1780 if (data[IFLA_GRE_TTL])
1781 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1782
1783 if (data[IFLA_GRE_ENCAP_LIMIT])
1784 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1785
1786 if (data[IFLA_GRE_FLOWINFO])
1787 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1788
1789 if (data[IFLA_GRE_FLAGS])
1790 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1791
1792 if (data[IFLA_GRE_FWMARK])
1793 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1794
1795 if (data[IFLA_GRE_COLLECT_METADATA])
1796 parms->collect_md = true;
1797 }
1798
1799 static int ip6gre_tap_init(struct net_device *dev)
1800 {
1801 int ret;
1802
1803 ret = ip6gre_tunnel_init_common(dev);
1804 if (ret)
1805 return ret;
1806
1807 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1808
1809 return 0;
1810 }
1811
1812 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1813 .ndo_init = ip6gre_tap_init,
1814 .ndo_uninit = ip6gre_tunnel_uninit,
1815 .ndo_start_xmit = ip6gre_tunnel_xmit,
1816 .ndo_set_mac_address = eth_mac_addr,
1817 .ndo_validate_addr = eth_validate_addr,
1818 .ndo_change_mtu = ip6_tnl_change_mtu,
1819 .ndo_get_stats64 = ip_tunnel_get_stats64,
1820 .ndo_get_iflink = ip6_tnl_get_iflink,
1821 };
1822
1823 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1824 {
1825 int t_hlen;
1826
1827 tunnel->tun_hlen = 8;
1828 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1829 erspan_hdr_len(tunnel->parms.erspan_ver);
1830
1831 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1832 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1833 return t_hlen;
1834 }
1835
1836 static int ip6erspan_tap_init(struct net_device *dev)
1837 {
1838 struct ip6_tnl *tunnel;
1839 int t_hlen;
1840 int ret;
1841
1842 tunnel = netdev_priv(dev);
1843
1844 tunnel->dev = dev;
1845 tunnel->net = dev_net(dev);
1846 strcpy(tunnel->parms.name, dev->name);
1847
1848 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1849 if (!dev->tstats)
1850 return -ENOMEM;
1851
1852 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1853 if (ret)
1854 goto cleanup_alloc_pcpu_stats;
1855
1856 ret = gro_cells_init(&tunnel->gro_cells, dev);
1857 if (ret)
1858 goto cleanup_dst_cache_init;
1859
1860 t_hlen = ip6erspan_calc_hlen(tunnel);
1861 dev->mtu = ETH_DATA_LEN - t_hlen;
1862 if (dev->type == ARPHRD_ETHER)
1863 dev->mtu -= ETH_HLEN;
1864 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1865 dev->mtu -= 8;
1866
1867 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1868 ip6erspan_tnl_link_config(tunnel, 1);
1869
1870 return 0;
1871
1872 cleanup_dst_cache_init:
1873 dst_cache_destroy(&tunnel->dst_cache);
1874 cleanup_alloc_pcpu_stats:
1875 free_percpu(dev->tstats);
1876 dev->tstats = NULL;
1877 return ret;
1878 }
1879
1880 static const struct net_device_ops ip6erspan_netdev_ops = {
1881 .ndo_init = ip6erspan_tap_init,
1882 .ndo_uninit = ip6erspan_tunnel_uninit,
1883 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1884 .ndo_set_mac_address = eth_mac_addr,
1885 .ndo_validate_addr = eth_validate_addr,
1886 .ndo_change_mtu = ip6_tnl_change_mtu,
1887 .ndo_get_stats64 = ip_tunnel_get_stats64,
1888 .ndo_get_iflink = ip6_tnl_get_iflink,
1889 };
1890
1891 static void ip6gre_tap_setup(struct net_device *dev)
1892 {
1893
1894 ether_setup(dev);
1895
1896 dev->max_mtu = 0;
1897 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1898 dev->needs_free_netdev = true;
1899 dev->priv_destructor = ip6gre_dev_free;
1900
1901 dev->features |= NETIF_F_NETNS_LOCAL;
1902 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1903 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1904 netif_keep_dst(dev);
1905 }
1906
1907 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1908 struct ip_tunnel_encap *ipencap)
1909 {
1910 bool ret = false;
1911
1912 memset(ipencap, 0, sizeof(*ipencap));
1913
1914 if (!data)
1915 return ret;
1916
1917 if (data[IFLA_GRE_ENCAP_TYPE]) {
1918 ret = true;
1919 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1920 }
1921
1922 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1923 ret = true;
1924 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1925 }
1926
1927 if (data[IFLA_GRE_ENCAP_SPORT]) {
1928 ret = true;
1929 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1930 }
1931
1932 if (data[IFLA_GRE_ENCAP_DPORT]) {
1933 ret = true;
1934 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1935 }
1936
1937 return ret;
1938 }
1939
1940 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1941 struct nlattr *tb[], struct nlattr *data[],
1942 struct netlink_ext_ack *extack)
1943 {
1944 struct ip6_tnl *nt;
1945 struct ip_tunnel_encap ipencap;
1946 int err;
1947
1948 nt = netdev_priv(dev);
1949
1950 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1951 int err = ip6_tnl_encap_setup(nt, &ipencap);
1952
1953 if (err < 0)
1954 return err;
1955 }
1956
1957 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1958 eth_hw_addr_random(dev);
1959
1960 nt->dev = dev;
1961 nt->net = dev_net(dev);
1962
1963 err = register_netdevice(dev);
1964 if (err)
1965 goto out;
1966
1967 if (tb[IFLA_MTU])
1968 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1969
1970 dev_hold(dev);
1971
1972 out:
1973 return err;
1974 }
1975
1976 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1977 struct nlattr *tb[], struct nlattr *data[],
1978 struct netlink_ext_ack *extack)
1979 {
1980 struct ip6_tnl *nt = netdev_priv(dev);
1981 struct net *net = dev_net(dev);
1982 struct ip6gre_net *ign;
1983 int err;
1984
1985 ip6gre_netlink_parms(data, &nt->parms);
1986 ign = net_generic(net, ip6gre_net_id);
1987
1988 if (nt->parms.collect_md) {
1989 if (rtnl_dereference(ign->collect_md_tun))
1990 return -EEXIST;
1991 } else {
1992 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1993 return -EEXIST;
1994 }
1995
1996 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
1997 if (!err) {
1998 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1999 ip6gre_tunnel_link_md(ign, nt);
2000 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2001 }
2002 return err;
2003 }
2004
2005 static struct ip6_tnl *
2006 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2007 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2008 struct netlink_ext_ack *extack)
2009 {
2010 struct ip6_tnl *t, *nt = netdev_priv(dev);
2011 struct net *net = nt->net;
2012 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2013 struct ip_tunnel_encap ipencap;
2014
2015 if (dev == ign->fb_tunnel_dev)
2016 return ERR_PTR(-EINVAL);
2017
2018 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2019 int err = ip6_tnl_encap_setup(nt, &ipencap);
2020
2021 if (err < 0)
2022 return ERR_PTR(err);
2023 }
2024
2025 ip6gre_netlink_parms(data, p_p);
2026
2027 t = ip6gre_tunnel_locate(net, p_p, 0);
2028
2029 if (t) {
2030 if (t->dev != dev)
2031 return ERR_PTR(-EEXIST);
2032 } else {
2033 t = nt;
2034 }
2035
2036 return t;
2037 }
2038
2039 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2040 struct nlattr *data[],
2041 struct netlink_ext_ack *extack)
2042 {
2043 struct ip6_tnl *t = netdev_priv(dev);
2044 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2045 struct __ip6_tnl_parm p;
2046
2047 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2048 if (IS_ERR(t))
2049 return PTR_ERR(t);
2050
2051 ip6gre_tunnel_unlink_md(ign, t);
2052 ip6gre_tunnel_unlink(ign, t);
2053 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2054 ip6gre_tunnel_link_md(ign, t);
2055 ip6gre_tunnel_link(ign, t);
2056 return 0;
2057 }
2058
2059 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2060 {
2061 struct net *net = dev_net(dev);
2062 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2063
2064 if (dev != ign->fb_tunnel_dev)
2065 unregister_netdevice_queue(dev, head);
2066 }
2067
2068 static size_t ip6gre_get_size(const struct net_device *dev)
2069 {
2070 return
2071 /* IFLA_GRE_LINK */
2072 nla_total_size(4) +
2073 /* IFLA_GRE_IFLAGS */
2074 nla_total_size(2) +
2075 /* IFLA_GRE_OFLAGS */
2076 nla_total_size(2) +
2077 /* IFLA_GRE_IKEY */
2078 nla_total_size(4) +
2079 /* IFLA_GRE_OKEY */
2080 nla_total_size(4) +
2081 /* IFLA_GRE_LOCAL */
2082 nla_total_size(sizeof(struct in6_addr)) +
2083 /* IFLA_GRE_REMOTE */
2084 nla_total_size(sizeof(struct in6_addr)) +
2085 /* IFLA_GRE_TTL */
2086 nla_total_size(1) +
2087 /* IFLA_GRE_ENCAP_LIMIT */
2088 nla_total_size(1) +
2089 /* IFLA_GRE_FLOWINFO */
2090 nla_total_size(4) +
2091 /* IFLA_GRE_FLAGS */
2092 nla_total_size(4) +
2093 /* IFLA_GRE_ENCAP_TYPE */
2094 nla_total_size(2) +
2095 /* IFLA_GRE_ENCAP_FLAGS */
2096 nla_total_size(2) +
2097 /* IFLA_GRE_ENCAP_SPORT */
2098 nla_total_size(2) +
2099 /* IFLA_GRE_ENCAP_DPORT */
2100 nla_total_size(2) +
2101 /* IFLA_GRE_COLLECT_METADATA */
2102 nla_total_size(0) +
2103 /* IFLA_GRE_FWMARK */
2104 nla_total_size(4) +
2105 /* IFLA_GRE_ERSPAN_INDEX */
2106 nla_total_size(4) +
2107 0;
2108 }
2109
2110 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2111 {
2112 struct ip6_tnl *t = netdev_priv(dev);
2113 struct __ip6_tnl_parm *p = &t->parms;
2114 __be16 o_flags = p->o_flags;
2115
2116 if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2117 if (!p->collect_md)
2118 o_flags |= TUNNEL_KEY;
2119
2120 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2121 goto nla_put_failure;
2122
2123 if (p->erspan_ver == 1) {
2124 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2125 goto nla_put_failure;
2126 } else {
2127 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2128 goto nla_put_failure;
2129 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2130 goto nla_put_failure;
2131 }
2132 }
2133
2134 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2135 nla_put_be16(skb, IFLA_GRE_IFLAGS,
2136 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2137 nla_put_be16(skb, IFLA_GRE_OFLAGS,
2138 gre_tnl_flags_to_gre_flags(o_flags)) ||
2139 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2140 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2141 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2142 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2143 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2144 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2145 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2146 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2147 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
2148 goto nla_put_failure;
2149
2150 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2151 t->encap.type) ||
2152 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2153 t->encap.sport) ||
2154 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2155 t->encap.dport) ||
2156 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2157 t->encap.flags))
2158 goto nla_put_failure;
2159
2160 if (p->collect_md) {
2161 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2162 goto nla_put_failure;
2163 }
2164
2165 return 0;
2166
2167 nla_put_failure:
2168 return -EMSGSIZE;
2169 }
2170
2171 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2172 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2173 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2174 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2175 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2176 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2177 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
2178 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
2179 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2180 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2181 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2182 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
2183 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2184 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2185 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2186 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
2187 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2188 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
2189 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2190 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2191 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2192 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
2193 };
2194
2195 static void ip6erspan_tap_setup(struct net_device *dev)
2196 {
2197 ether_setup(dev);
2198
2199 dev->netdev_ops = &ip6erspan_netdev_ops;
2200 dev->needs_free_netdev = true;
2201 dev->priv_destructor = ip6gre_dev_free;
2202
2203 dev->features |= NETIF_F_NETNS_LOCAL;
2204 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2205 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2206 netif_keep_dst(dev);
2207 }
2208
2209 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2210 struct nlattr *tb[], struct nlattr *data[],
2211 struct netlink_ext_ack *extack)
2212 {
2213 struct ip6_tnl *nt = netdev_priv(dev);
2214 struct net *net = dev_net(dev);
2215 struct ip6gre_net *ign;
2216 int err;
2217
2218 ip6gre_netlink_parms(data, &nt->parms);
2219 ip6erspan_set_version(data, &nt->parms);
2220 ign = net_generic(net, ip6gre_net_id);
2221
2222 if (nt->parms.collect_md) {
2223 if (rtnl_dereference(ign->collect_md_tun_erspan))
2224 return -EEXIST;
2225 } else {
2226 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2227 return -EEXIST;
2228 }
2229
2230 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2231 if (!err) {
2232 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2233 ip6erspan_tunnel_link_md(ign, nt);
2234 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2235 }
2236 return err;
2237 }
2238
2239 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2240 {
2241 ip6gre_tnl_link_config_common(t);
2242 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2243 }
2244
2245 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2246 const struct __ip6_tnl_parm *p, int set_mtu)
2247 {
2248 ip6gre_tnl_copy_tnl_parm(t, p);
2249 ip6erspan_tnl_link_config(t, set_mtu);
2250 return 0;
2251 }
2252
2253 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2254 struct nlattr *data[],
2255 struct netlink_ext_ack *extack)
2256 {
2257 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2258 struct __ip6_tnl_parm p;
2259 struct ip6_tnl *t;
2260
2261 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2262 if (IS_ERR(t))
2263 return PTR_ERR(t);
2264
2265 ip6erspan_set_version(data, &p);
2266 ip6gre_tunnel_unlink_md(ign, t);
2267 ip6gre_tunnel_unlink(ign, t);
2268 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2269 ip6erspan_tunnel_link_md(ign, t);
2270 ip6gre_tunnel_link(ign, t);
2271 return 0;
2272 }
2273
2274 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2275 .kind = "ip6gre",
2276 .maxtype = IFLA_GRE_MAX,
2277 .policy = ip6gre_policy,
2278 .priv_size = sizeof(struct ip6_tnl),
2279 .setup = ip6gre_tunnel_setup,
2280 .validate = ip6gre_tunnel_validate,
2281 .newlink = ip6gre_newlink,
2282 .changelink = ip6gre_changelink,
2283 .dellink = ip6gre_dellink,
2284 .get_size = ip6gre_get_size,
2285 .fill_info = ip6gre_fill_info,
2286 .get_link_net = ip6_tnl_get_link_net,
2287 };
2288
2289 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2290 .kind = "ip6gretap",
2291 .maxtype = IFLA_GRE_MAX,
2292 .policy = ip6gre_policy,
2293 .priv_size = sizeof(struct ip6_tnl),
2294 .setup = ip6gre_tap_setup,
2295 .validate = ip6gre_tap_validate,
2296 .newlink = ip6gre_newlink,
2297 .changelink = ip6gre_changelink,
2298 .get_size = ip6gre_get_size,
2299 .fill_info = ip6gre_fill_info,
2300 .get_link_net = ip6_tnl_get_link_net,
2301 };
2302
2303 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2304 .kind = "ip6erspan",
2305 .maxtype = IFLA_GRE_MAX,
2306 .policy = ip6gre_policy,
2307 .priv_size = sizeof(struct ip6_tnl),
2308 .setup = ip6erspan_tap_setup,
2309 .validate = ip6erspan_tap_validate,
2310 .newlink = ip6erspan_newlink,
2311 .changelink = ip6erspan_changelink,
2312 .get_size = ip6gre_get_size,
2313 .fill_info = ip6gre_fill_info,
2314 .get_link_net = ip6_tnl_get_link_net,
2315 };
2316
2317 /*
2318 * And now the modules code and kernel interface.
2319 */
2320
2321 static int __init ip6gre_init(void)
2322 {
2323 int err;
2324
2325 pr_info("GRE over IPv6 tunneling driver\n");
2326
2327 err = register_pernet_device(&ip6gre_net_ops);
2328 if (err < 0)
2329 return err;
2330
2331 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2332 if (err < 0) {
2333 pr_info("%s: can't add protocol\n", __func__);
2334 goto add_proto_failed;
2335 }
2336
2337 err = rtnl_link_register(&ip6gre_link_ops);
2338 if (err < 0)
2339 goto rtnl_link_failed;
2340
2341 err = rtnl_link_register(&ip6gre_tap_ops);
2342 if (err < 0)
2343 goto tap_ops_failed;
2344
2345 err = rtnl_link_register(&ip6erspan_tap_ops);
2346 if (err < 0)
2347 goto erspan_link_failed;
2348
2349 out:
2350 return err;
2351
2352 erspan_link_failed:
2353 rtnl_link_unregister(&ip6gre_tap_ops);
2354 tap_ops_failed:
2355 rtnl_link_unregister(&ip6gre_link_ops);
2356 rtnl_link_failed:
2357 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2358 add_proto_failed:
2359 unregister_pernet_device(&ip6gre_net_ops);
2360 goto out;
2361 }
2362
2363 static void __exit ip6gre_fini(void)
2364 {
2365 rtnl_link_unregister(&ip6gre_tap_ops);
2366 rtnl_link_unregister(&ip6gre_link_ops);
2367 rtnl_link_unregister(&ip6erspan_tap_ops);
2368 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2369 unregister_pernet_device(&ip6gre_net_ops);
2370 }
2371
2372 module_init(ip6gre_init);
2373 module_exit(ip6gre_fini);
2374 MODULE_LICENSE("GPL");
2375 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2376 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2377 MODULE_ALIAS_RTNL_LINK("ip6gre");
2378 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2379 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2380 MODULE_ALIAS_NETDEV("ip6gre0");
Linux with added FPC-III support