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Linux 4.19-rc7
[linux-2.6/btrfs-unstable.git] / net / ipv6 / ip6_gre.c
blobe493b041d4ac9900d44972a22ebdc898def323fe
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 void 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 gre_base_hdr *greh;
431 const struct ipv6hdr *ipv6h;
432 int grehlen = sizeof(*greh);
433 struct ip6_tnl *t;
434 int key_off = 0;
435 __be16 flags;
436 __be32 key;
437
438 if (!pskb_may_pull(skb, offset + grehlen))
439 return;
440 greh = (const struct gre_base_hdr *)(skb->data + offset);
441 flags = greh->flags;
442 if (flags & (GRE_VERSION | GRE_ROUTING))
443 return;
444 if (flags & GRE_CSUM)
445 grehlen += 4;
446 if (flags & GRE_KEY) {
447 key_off = grehlen + offset;
448 grehlen += 4;
449 }
450
451 if (!pskb_may_pull(skb, offset + grehlen))
452 return;
453 ipv6h = (const struct ipv6hdr *)skb->data;
454 greh = (const struct gre_base_hdr *)(skb->data + offset);
455 key = key_off ? *(__be32 *)(skb->data + key_off) : 0;
456
457 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
458 key, greh->protocol);
459 if (!t)
460 return;
461
462 switch (type) {
463 struct ipv6_tlv_tnl_enc_lim *tel;
464 __u32 teli;
465 case ICMPV6_DEST_UNREACH:
466 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
467 t->parms.name);
468 if (code != ICMPV6_PORT_UNREACH)
469 break;
470 return;
471 case ICMPV6_TIME_EXCEED:
472 if (code == ICMPV6_EXC_HOPLIMIT) {
473 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
474 t->parms.name);
475 break;
476 }
477 return;
478 case ICMPV6_PARAMPROB:
479 teli = 0;
480 if (code == ICMPV6_HDR_FIELD)
481 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
482
483 if (teli && teli == be32_to_cpu(info) - 2) {
484 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
485 if (tel->encap_limit == 0) {
486 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
487 t->parms.name);
488 }
489 } else {
490 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
491 t->parms.name);
492 }
493 return;
494 case ICMPV6_PKT_TOOBIG:
495 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
496 return;
497 case NDISC_REDIRECT:
498 ip6_redirect(skb, net, skb->dev->ifindex, 0,
499 sock_net_uid(net, NULL));
500 return;
501 }
502
503 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
504 t->err_count++;
505 else
506 t->err_count = 1;
507 t->err_time = jiffies;
508 }
509
510 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
511 {
512 const struct ipv6hdr *ipv6h;
513 struct ip6_tnl *tunnel;
514
515 ipv6h = ipv6_hdr(skb);
516 tunnel = ip6gre_tunnel_lookup(skb->dev,
517 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
518 tpi->proto);
519 if (tunnel) {
520 if (tunnel->parms.collect_md) {
521 struct metadata_dst *tun_dst;
522 __be64 tun_id;
523 __be16 flags;
524
525 flags = tpi->flags;
526 tun_id = key32_to_tunnel_id(tpi->key);
527
528 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
529 if (!tun_dst)
530 return PACKET_REJECT;
531
532 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
533 } else {
534 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
535 }
536
537 return PACKET_RCVD;
538 }
539
540 return PACKET_REJECT;
541 }
542
543 static int ip6erspan_rcv(struct sk_buff *skb, int gre_hdr_len,
544 struct tnl_ptk_info *tpi)
545 {
546 struct erspan_base_hdr *ershdr;
547 struct erspan_metadata *pkt_md;
548 const struct ipv6hdr *ipv6h;
549 struct erspan_md2 *md2;
550 struct ip6_tnl *tunnel;
551 u8 ver;
552
553 if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr))))
554 return PACKET_REJECT;
555
556 ipv6h = ipv6_hdr(skb);
557 ershdr = (struct erspan_base_hdr *)skb->data;
558 ver = ershdr->ver;
559 tpi->key = cpu_to_be32(get_session_id(ershdr));
560
561 tunnel = ip6gre_tunnel_lookup(skb->dev,
562 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
563 tpi->proto);
564 if (tunnel) {
565 int len = erspan_hdr_len(ver);
566
567 if (unlikely(!pskb_may_pull(skb, len)))
568 return PACKET_REJECT;
569
570 ershdr = (struct erspan_base_hdr *)skb->data;
571 pkt_md = (struct erspan_metadata *)(ershdr + 1);
572
573 if (__iptunnel_pull_header(skb, len,
574 htons(ETH_P_TEB),
575 false, false) < 0)
576 return PACKET_REJECT;
577
578 if (tunnel->parms.collect_md) {
579 struct metadata_dst *tun_dst;
580 struct ip_tunnel_info *info;
581 struct erspan_metadata *md;
582 __be64 tun_id;
583 __be16 flags;
584
585 tpi->flags |= TUNNEL_KEY;
586 flags = tpi->flags;
587 tun_id = key32_to_tunnel_id(tpi->key);
588
589 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
590 sizeof(*md));
591 if (!tun_dst)
592 return PACKET_REJECT;
593
594 info = &tun_dst->u.tun_info;
595 md = ip_tunnel_info_opts(info);
596 md->version = ver;
597 md2 = &md->u.md2;
598 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
599 ERSPAN_V2_MDSIZE);
600 info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
601 info->options_len = sizeof(*md);
602
603 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
604
605 } else {
606 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
607 }
608
609 return PACKET_RCVD;
610 }
611
612 return PACKET_REJECT;
613 }
614
615 static int gre_rcv(struct sk_buff *skb)
616 {
617 struct tnl_ptk_info tpi;
618 bool csum_err = false;
619 int hdr_len;
620
621 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
622 if (hdr_len < 0)
623 goto drop;
624
625 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
626 goto drop;
627
628 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
629 tpi.proto == htons(ETH_P_ERSPAN2))) {
630 if (ip6erspan_rcv(skb, hdr_len, &tpi) == PACKET_RCVD)
631 return 0;
632 goto out;
633 }
634
635 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
636 return 0;
637
638 out:
639 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
640 drop:
641 kfree_skb(skb);
642 return 0;
643 }
644
645 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
646 {
647 return iptunnel_handle_offloads(skb,
648 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
649 }
650
651 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
652 struct net_device *dev,
653 struct flowi6 *fl6, __u8 *dsfield,
654 int *encap_limit)
655 {
656 const struct iphdr *iph = ip_hdr(skb);
657 struct ip6_tnl *t = netdev_priv(dev);
658
659 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
660 *encap_limit = t->parms.encap_limit;
661
662 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
663
664 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
665 *dsfield = ipv4_get_dsfield(iph);
666 else
667 *dsfield = ip6_tclass(t->parms.flowinfo);
668
669 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
670 fl6->flowi6_mark = skb->mark;
671 else
672 fl6->flowi6_mark = t->parms.fwmark;
673
674 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
675 }
676
677 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
678 struct net_device *dev,
679 struct flowi6 *fl6, __u8 *dsfield,
680 int *encap_limit)
681 {
682 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
683 struct ip6_tnl *t = netdev_priv(dev);
684 __u16 offset;
685
686 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
687 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
688
689 if (offset > 0) {
690 struct ipv6_tlv_tnl_enc_lim *tel;
691
692 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
693 if (tel->encap_limit == 0) {
694 icmpv6_send(skb, ICMPV6_PARAMPROB,
695 ICMPV6_HDR_FIELD, offset + 2);
696 return -1;
697 }
698 *encap_limit = tel->encap_limit - 1;
699 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
700 *encap_limit = t->parms.encap_limit;
701 }
702
703 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
704
705 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
706 *dsfield = ipv6_get_dsfield(ipv6h);
707 else
708 *dsfield = ip6_tclass(t->parms.flowinfo);
709
710 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
711 fl6->flowlabel |= ip6_flowlabel(ipv6h);
712
713 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
714 fl6->flowi6_mark = skb->mark;
715 else
716 fl6->flowi6_mark = t->parms.fwmark;
717
718 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
719
720 return 0;
721 }
722
723 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
724 struct net_device *dev, __u8 dsfield,
725 struct flowi6 *fl6, int encap_limit,
726 __u32 *pmtu, __be16 proto)
727 {
728 struct ip6_tnl *tunnel = netdev_priv(dev);
729 __be16 protocol;
730
731 if (dev->type == ARPHRD_ETHER)
732 IPCB(skb)->flags = 0;
733
734 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
735 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
736 else
737 fl6->daddr = tunnel->parms.raddr;
738
739 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
740 return -ENOMEM;
741
742 /* Push GRE header. */
743 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
744
745 if (tunnel->parms.collect_md) {
746 struct ip_tunnel_info *tun_info;
747 const struct ip_tunnel_key *key;
748 __be16 flags;
749
750 tun_info = skb_tunnel_info(skb);
751 if (unlikely(!tun_info ||
752 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
753 ip_tunnel_info_af(tun_info) != AF_INET6))
754 return -EINVAL;
755
756 key = &tun_info->key;
757 memset(fl6, 0, sizeof(*fl6));
758 fl6->flowi6_proto = IPPROTO_GRE;
759 fl6->daddr = key->u.ipv6.dst;
760 fl6->flowlabel = key->label;
761 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
762
763 dsfield = key->tos;
764 flags = key->tun_flags &
765 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
766 tunnel->tun_hlen = gre_calc_hlen(flags);
767
768 gre_build_header(skb, tunnel->tun_hlen,
769 flags, protocol,
770 tunnel_id_to_key32(tun_info->key.tun_id),
771 (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++)
772 : 0);
773
774 } else {
775 if (tunnel->parms.o_flags & TUNNEL_SEQ)
776 tunnel->o_seqno++;
777
778 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
779 protocol, tunnel->parms.o_key,
780 htonl(tunnel->o_seqno));
781 }
782
783 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
784 NEXTHDR_GRE);
785 }
786
787 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
788 {
789 struct ip6_tnl *t = netdev_priv(dev);
790 int encap_limit = -1;
791 struct flowi6 fl6;
792 __u8 dsfield = 0;
793 __u32 mtu;
794 int err;
795
796 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
797
798 if (!t->parms.collect_md)
799 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
800 &dsfield, &encap_limit);
801
802 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
803 if (err)
804 return -1;
805
806 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
807 skb->protocol);
808 if (err != 0) {
809 /* XXX: send ICMP error even if DF is not set. */
810 if (err == -EMSGSIZE)
811 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
812 htonl(mtu));
813 return -1;
814 }
815
816 return 0;
817 }
818
819 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
820 {
821 struct ip6_tnl *t = netdev_priv(dev);
822 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
823 int encap_limit = -1;
824 struct flowi6 fl6;
825 __u8 dsfield = 0;
826 __u32 mtu;
827 int err;
828
829 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
830 return -1;
831
832 if (!t->parms.collect_md &&
833 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
834 return -1;
835
836 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
837 return -1;
838
839 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
840 &mtu, skb->protocol);
841 if (err != 0) {
842 if (err == -EMSGSIZE)
843 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
844 return -1;
845 }
846
847 return 0;
848 }
849
850 /**
851 * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own
852 * @t: the outgoing tunnel device
853 * @hdr: IPv6 header from the incoming packet
854 *
855 * Description:
856 * Avoid trivial tunneling loop by checking that tunnel exit-point
857 * doesn't match source of incoming packet.
858 *
859 * Return:
860 * 1 if conflict,
861 * 0 else
862 **/
863
864 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
865 const struct ipv6hdr *hdr)
866 {
867 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
868 }
869
870 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
871 {
872 struct ip6_tnl *t = netdev_priv(dev);
873 int encap_limit = -1;
874 struct flowi6 fl6;
875 __u32 mtu;
876 int err;
877
878 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
879 encap_limit = t->parms.encap_limit;
880
881 if (!t->parms.collect_md)
882 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
883
884 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
885 if (err)
886 return err;
887
888 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
889
890 return err;
891 }
892
893 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
894 struct net_device *dev)
895 {
896 struct ip6_tnl *t = netdev_priv(dev);
897 struct net_device_stats *stats = &t->dev->stats;
898 int ret;
899
900 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
901 goto tx_err;
902
903 switch (skb->protocol) {
904 case htons(ETH_P_IP):
905 ret = ip6gre_xmit_ipv4(skb, dev);
906 break;
907 case htons(ETH_P_IPV6):
908 ret = ip6gre_xmit_ipv6(skb, dev);
909 break;
910 default:
911 ret = ip6gre_xmit_other(skb, dev);
912 break;
913 }
914
915 if (ret < 0)
916 goto tx_err;
917
918 return NETDEV_TX_OK;
919
920 tx_err:
921 stats->tx_errors++;
922 stats->tx_dropped++;
923 kfree_skb(skb);
924 return NETDEV_TX_OK;
925 }
926
927 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
928 struct net_device *dev)
929 {
930 struct ip6_tnl *t = netdev_priv(dev);
931 struct dst_entry *dst = skb_dst(skb);
932 struct net_device_stats *stats;
933 bool truncate = false;
934 int encap_limit = -1;
935 __u8 dsfield = false;
936 struct flowi6 fl6;
937 int err = -EINVAL;
938 __u32 mtu;
939 int nhoff;
940 int thoff;
941
942 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
943 goto tx_err;
944
945 if (gre_handle_offloads(skb, false))
946 goto tx_err;
947
948 if (skb->len > dev->mtu + dev->hard_header_len) {
949 pskb_trim(skb, dev->mtu + dev->hard_header_len);
950 truncate = true;
951 }
952
953 nhoff = skb_network_header(skb) - skb_mac_header(skb);
954 if (skb->protocol == htons(ETH_P_IP) &&
955 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
956 truncate = true;
957
958 thoff = skb_transport_header(skb) - skb_mac_header(skb);
959 if (skb->protocol == htons(ETH_P_IPV6) &&
960 (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff))
961 truncate = true;
962
963 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
964 goto tx_err;
965
966 t->parms.o_flags &= ~TUNNEL_KEY;
967 IPCB(skb)->flags = 0;
968
969 /* For collect_md mode, derive fl6 from the tunnel key,
970 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
971 */
972 if (t->parms.collect_md) {
973 struct ip_tunnel_info *tun_info;
974 const struct ip_tunnel_key *key;
975 struct erspan_metadata *md;
976 __be32 tun_id;
977
978 tun_info = skb_tunnel_info(skb);
979 if (unlikely(!tun_info ||
980 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
981 ip_tunnel_info_af(tun_info) != AF_INET6))
982 return -EINVAL;
983
984 key = &tun_info->key;
985 memset(&fl6, 0, sizeof(fl6));
986 fl6.flowi6_proto = IPPROTO_GRE;
987 fl6.daddr = key->u.ipv6.dst;
988 fl6.flowlabel = key->label;
989 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
990
991 dsfield = key->tos;
992 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
993 goto tx_err;
994 md = ip_tunnel_info_opts(tun_info);
995 if (!md)
996 goto tx_err;
997
998 tun_id = tunnel_id_to_key32(key->tun_id);
999 if (md->version == 1) {
1000 erspan_build_header(skb,
1001 ntohl(tun_id),
1002 ntohl(md->u.index), truncate,
1003 false);
1004 } else if (md->version == 2) {
1005 erspan_build_header_v2(skb,
1006 ntohl(tun_id),
1007 md->u.md2.dir,
1008 get_hwid(&md->u.md2),
1009 truncate, false);
1010 } else {
1011 goto tx_err;
1012 }
1013 } else {
1014 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
1015
1016 switch (skb->protocol) {
1017 case htons(ETH_P_IP):
1018 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1019 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1020 &dsfield, &encap_limit);
1021 break;
1022 case htons(ETH_P_IPV6):
1023 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
1024 goto tx_err;
1025 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1026 &dsfield, &encap_limit))
1027 goto tx_err;
1028 break;
1029 default:
1030 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1031 break;
1032 }
1033
1034 if (t->parms.erspan_ver == 1)
1035 erspan_build_header(skb, ntohl(t->parms.o_key),
1036 t->parms.index,
1037 truncate, false);
1038 else if (t->parms.erspan_ver == 2)
1039 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1040 t->parms.dir,
1041 t->parms.hwid,
1042 truncate, false);
1043 else
1044 goto tx_err;
1045
1046 fl6.daddr = t->parms.raddr;
1047 }
1048
1049 /* Push GRE header. */
1050 gre_build_header(skb, 8, TUNNEL_SEQ,
1051 htons(ETH_P_ERSPAN), 0, htonl(t->o_seqno++));
1052
1053 /* TooBig packet may have updated dst->dev's mtu */
1054 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1055 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu);
1056
1057 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1058 NEXTHDR_GRE);
1059 if (err != 0) {
1060 /* XXX: send ICMP error even if DF is not set. */
1061 if (err == -EMSGSIZE) {
1062 if (skb->protocol == htons(ETH_P_IP))
1063 icmp_send(skb, ICMP_DEST_UNREACH,
1064 ICMP_FRAG_NEEDED, htonl(mtu));
1065 else
1066 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1067 }
1068
1069 goto tx_err;
1070 }
1071 return NETDEV_TX_OK;
1072
1073 tx_err:
1074 stats = &t->dev->stats;
1075 stats->tx_errors++;
1076 stats->tx_dropped++;
1077 kfree_skb(skb);
1078 return NETDEV_TX_OK;
1079 }
1080
1081 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1082 {
1083 struct net_device *dev = t->dev;
1084 struct __ip6_tnl_parm *p = &t->parms;
1085 struct flowi6 *fl6 = &t->fl.u.ip6;
1086
1087 if (dev->type != ARPHRD_ETHER) {
1088 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1089 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1090 }
1091
1092 /* Set up flowi template */
1093 fl6->saddr = p->laddr;
1094 fl6->daddr = p->raddr;
1095 fl6->flowi6_oif = p->link;
1096 fl6->flowlabel = 0;
1097 fl6->flowi6_proto = IPPROTO_GRE;
1098
1099 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1100 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1101 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1102 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1103
1104 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1105 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1106
1107 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1108 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1109 dev->flags |= IFF_POINTOPOINT;
1110 else
1111 dev->flags &= ~IFF_POINTOPOINT;
1112 }
1113
1114 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1115 int t_hlen)
1116 {
1117 const struct __ip6_tnl_parm *p = &t->parms;
1118 struct net_device *dev = t->dev;
1119
1120 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1121 int strict = (ipv6_addr_type(&p->raddr) &
1122 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1123
1124 struct rt6_info *rt = rt6_lookup(t->net,
1125 &p->raddr, &p->laddr,
1126 p->link, NULL, strict);
1127
1128 if (!rt)
1129 return;
1130
1131 if (rt->dst.dev) {
1132 dev->needed_headroom = rt->dst.dev->hard_header_len +
1133 t_hlen;
1134
1135 if (set_mtu) {
1136 dev->mtu = rt->dst.dev->mtu - t_hlen;
1137 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1138 dev->mtu -= 8;
1139 if (dev->type == ARPHRD_ETHER)
1140 dev->mtu -= ETH_HLEN;
1141
1142 if (dev->mtu < IPV6_MIN_MTU)
1143 dev->mtu = IPV6_MIN_MTU;
1144 }
1145 }
1146 ip6_rt_put(rt);
1147 }
1148 }
1149
1150 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1151 {
1152 int t_hlen;
1153
1154 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1155 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1156
1157 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1158 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1159 return t_hlen;
1160 }
1161
1162 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1163 {
1164 ip6gre_tnl_link_config_common(t);
1165 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1166 }
1167
1168 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1169 const struct __ip6_tnl_parm *p)
1170 {
1171 t->parms.laddr = p->laddr;
1172 t->parms.raddr = p->raddr;
1173 t->parms.flags = p->flags;
1174 t->parms.hop_limit = p->hop_limit;
1175 t->parms.encap_limit = p->encap_limit;
1176 t->parms.flowinfo = p->flowinfo;
1177 t->parms.link = p->link;
1178 t->parms.proto = p->proto;
1179 t->parms.i_key = p->i_key;
1180 t->parms.o_key = p->o_key;
1181 t->parms.i_flags = p->i_flags;
1182 t->parms.o_flags = p->o_flags;
1183 t->parms.fwmark = p->fwmark;
1184 dst_cache_reset(&t->dst_cache);
1185 }
1186
1187 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1188 int set_mtu)
1189 {
1190 ip6gre_tnl_copy_tnl_parm(t, p);
1191 ip6gre_tnl_link_config(t, set_mtu);
1192 return 0;
1193 }
1194
1195 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1196 const struct ip6_tnl_parm2 *u)
1197 {
1198 p->laddr = u->laddr;
1199 p->raddr = u->raddr;
1200 p->flags = u->flags;
1201 p->hop_limit = u->hop_limit;
1202 p->encap_limit = u->encap_limit;
1203 p->flowinfo = u->flowinfo;
1204 p->link = u->link;
1205 p->i_key = u->i_key;
1206 p->o_key = u->o_key;
1207 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1208 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1209 memcpy(p->name, u->name, sizeof(u->name));
1210 }
1211
1212 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1213 const struct __ip6_tnl_parm *p)
1214 {
1215 u->proto = IPPROTO_GRE;
1216 u->laddr = p->laddr;
1217 u->raddr = p->raddr;
1218 u->flags = p->flags;
1219 u->hop_limit = p->hop_limit;
1220 u->encap_limit = p->encap_limit;
1221 u->flowinfo = p->flowinfo;
1222 u->link = p->link;
1223 u->i_key = p->i_key;
1224 u->o_key = p->o_key;
1225 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1226 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1227 memcpy(u->name, p->name, sizeof(u->name));
1228 }
1229
1230 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1231 struct ifreq *ifr, int cmd)
1232 {
1233 int err = 0;
1234 struct ip6_tnl_parm2 p;
1235 struct __ip6_tnl_parm p1;
1236 struct ip6_tnl *t = netdev_priv(dev);
1237 struct net *net = t->net;
1238 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1239
1240 memset(&p1, 0, sizeof(p1));
1241
1242 switch (cmd) {
1243 case SIOCGETTUNNEL:
1244 if (dev == ign->fb_tunnel_dev) {
1245 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1246 err = -EFAULT;
1247 break;
1248 }
1249 ip6gre_tnl_parm_from_user(&p1, &p);
1250 t = ip6gre_tunnel_locate(net, &p1, 0);
1251 if (!t)
1252 t = netdev_priv(dev);
1253 }
1254 memset(&p, 0, sizeof(p));
1255 ip6gre_tnl_parm_to_user(&p, &t->parms);
1256 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1257 err = -EFAULT;
1258 break;
1259
1260 case SIOCADDTUNNEL:
1261 case SIOCCHGTUNNEL:
1262 err = -EPERM;
1263 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1264 goto done;
1265
1266 err = -EFAULT;
1267 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1268 goto done;
1269
1270 err = -EINVAL;
1271 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1272 goto done;
1273
1274 if (!(p.i_flags&GRE_KEY))
1275 p.i_key = 0;
1276 if (!(p.o_flags&GRE_KEY))
1277 p.o_key = 0;
1278
1279 ip6gre_tnl_parm_from_user(&p1, &p);
1280 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1281
1282 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1283 if (t) {
1284 if (t->dev != dev) {
1285 err = -EEXIST;
1286 break;
1287 }
1288 } else {
1289 t = netdev_priv(dev);
1290
1291 ip6gre_tunnel_unlink(ign, t);
1292 synchronize_net();
1293 ip6gre_tnl_change(t, &p1, 1);
1294 ip6gre_tunnel_link(ign, t);
1295 netdev_state_change(dev);
1296 }
1297 }
1298
1299 if (t) {
1300 err = 0;
1301
1302 memset(&p, 0, sizeof(p));
1303 ip6gre_tnl_parm_to_user(&p, &t->parms);
1304 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1305 err = -EFAULT;
1306 } else
1307 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1308 break;
1309
1310 case SIOCDELTUNNEL:
1311 err = -EPERM;
1312 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1313 goto done;
1314
1315 if (dev == ign->fb_tunnel_dev) {
1316 err = -EFAULT;
1317 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1318 goto done;
1319 err = -ENOENT;
1320 ip6gre_tnl_parm_from_user(&p1, &p);
1321 t = ip6gre_tunnel_locate(net, &p1, 0);
1322 if (!t)
1323 goto done;
1324 err = -EPERM;
1325 if (t == netdev_priv(ign->fb_tunnel_dev))
1326 goto done;
1327 dev = t->dev;
1328 }
1329 unregister_netdevice(dev);
1330 err = 0;
1331 break;
1332
1333 default:
1334 err = -EINVAL;
1335 }
1336
1337 done:
1338 return err;
1339 }
1340
1341 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1342 unsigned short type, const void *daddr,
1343 const void *saddr, unsigned int len)
1344 {
1345 struct ip6_tnl *t = netdev_priv(dev);
1346 struct ipv6hdr *ipv6h;
1347 __be16 *p;
1348
1349 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1350 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1351 t->fl.u.ip6.flowlabel,
1352 true, &t->fl.u.ip6));
1353 ipv6h->hop_limit = t->parms.hop_limit;
1354 ipv6h->nexthdr = NEXTHDR_GRE;
1355 ipv6h->saddr = t->parms.laddr;
1356 ipv6h->daddr = t->parms.raddr;
1357
1358 p = (__be16 *)(ipv6h + 1);
1359 p[0] = t->parms.o_flags;
1360 p[1] = htons(type);
1361
1362 /*
1363 * Set the source hardware address.
1364 */
1365
1366 if (saddr)
1367 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1368 if (daddr)
1369 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1370 if (!ipv6_addr_any(&ipv6h->daddr))
1371 return t->hlen;
1372
1373 return -t->hlen;
1374 }
1375
1376 static const struct header_ops ip6gre_header_ops = {
1377 .create = ip6gre_header,
1378 };
1379
1380 static const struct net_device_ops ip6gre_netdev_ops = {
1381 .ndo_init = ip6gre_tunnel_init,
1382 .ndo_uninit = ip6gre_tunnel_uninit,
1383 .ndo_start_xmit = ip6gre_tunnel_xmit,
1384 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1385 .ndo_change_mtu = ip6_tnl_change_mtu,
1386 .ndo_get_stats64 = ip_tunnel_get_stats64,
1387 .ndo_get_iflink = ip6_tnl_get_iflink,
1388 };
1389
1390 static void ip6gre_dev_free(struct net_device *dev)
1391 {
1392 struct ip6_tnl *t = netdev_priv(dev);
1393
1394 gro_cells_destroy(&t->gro_cells);
1395 dst_cache_destroy(&t->dst_cache);
1396 free_percpu(dev->tstats);
1397 }
1398
1399 static void ip6gre_tunnel_setup(struct net_device *dev)
1400 {
1401 dev->netdev_ops = &ip6gre_netdev_ops;
1402 dev->needs_free_netdev = true;
1403 dev->priv_destructor = ip6gre_dev_free;
1404
1405 dev->type = ARPHRD_IP6GRE;
1406
1407 dev->flags |= IFF_NOARP;
1408 dev->addr_len = sizeof(struct in6_addr);
1409 netif_keep_dst(dev);
1410 /* This perm addr will be used as interface identifier by IPv6 */
1411 dev->addr_assign_type = NET_ADDR_RANDOM;
1412 eth_random_addr(dev->perm_addr);
1413 }
1414
1415 #define GRE6_FEATURES (NETIF_F_SG | \
1416 NETIF_F_FRAGLIST | \
1417 NETIF_F_HIGHDMA | \
1418 NETIF_F_HW_CSUM)
1419
1420 static void ip6gre_tnl_init_features(struct net_device *dev)
1421 {
1422 struct ip6_tnl *nt = netdev_priv(dev);
1423
1424 dev->features |= GRE6_FEATURES;
1425 dev->hw_features |= GRE6_FEATURES;
1426
1427 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1428 /* TCP offload with GRE SEQ is not supported, nor
1429 * can we support 2 levels of outer headers requiring
1430 * an update.
1431 */
1432 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1433 nt->encap.type == TUNNEL_ENCAP_NONE) {
1434 dev->features |= NETIF_F_GSO_SOFTWARE;
1435 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1436 }
1437
1438 /* Can use a lockless transmit, unless we generate
1439 * output sequences
1440 */
1441 dev->features |= NETIF_F_LLTX;
1442 }
1443 }
1444
1445 static int ip6gre_tunnel_init_common(struct net_device *dev)
1446 {
1447 struct ip6_tnl *tunnel;
1448 int ret;
1449 int t_hlen;
1450
1451 tunnel = netdev_priv(dev);
1452
1453 tunnel->dev = dev;
1454 tunnel->net = dev_net(dev);
1455 strcpy(tunnel->parms.name, dev->name);
1456
1457 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1458 if (!dev->tstats)
1459 return -ENOMEM;
1460
1461 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1462 if (ret)
1463 goto cleanup_alloc_pcpu_stats;
1464
1465 ret = gro_cells_init(&tunnel->gro_cells, dev);
1466 if (ret)
1467 goto cleanup_dst_cache_init;
1468
1469 t_hlen = ip6gre_calc_hlen(tunnel);
1470 dev->mtu = ETH_DATA_LEN - t_hlen;
1471 if (dev->type == ARPHRD_ETHER)
1472 dev->mtu -= ETH_HLEN;
1473 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1474 dev->mtu -= 8;
1475
1476 if (tunnel->parms.collect_md) {
1477 dev->features |= NETIF_F_NETNS_LOCAL;
1478 netif_keep_dst(dev);
1479 }
1480 ip6gre_tnl_init_features(dev);
1481
1482 return 0;
1483
1484 cleanup_dst_cache_init:
1485 dst_cache_destroy(&tunnel->dst_cache);
1486 cleanup_alloc_pcpu_stats:
1487 free_percpu(dev->tstats);
1488 dev->tstats = NULL;
1489 return ret;
1490 }
1491
1492 static int ip6gre_tunnel_init(struct net_device *dev)
1493 {
1494 struct ip6_tnl *tunnel;
1495 int ret;
1496
1497 ret = ip6gre_tunnel_init_common(dev);
1498 if (ret)
1499 return ret;
1500
1501 tunnel = netdev_priv(dev);
1502
1503 if (tunnel->parms.collect_md)
1504 return 0;
1505
1506 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1507 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1508
1509 if (ipv6_addr_any(&tunnel->parms.raddr))
1510 dev->header_ops = &ip6gre_header_ops;
1511
1512 return 0;
1513 }
1514
1515 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1516 {
1517 struct ip6_tnl *tunnel = netdev_priv(dev);
1518
1519 tunnel->dev = dev;
1520 tunnel->net = dev_net(dev);
1521 strcpy(tunnel->parms.name, dev->name);
1522
1523 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1524
1525 dev_hold(dev);
1526 }
1527
1528 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1529 .handler = gre_rcv,
1530 .err_handler = ip6gre_err,
1531 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1532 };
1533
1534 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1535 {
1536 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1537 struct net_device *dev, *aux;
1538 int prio;
1539
1540 for_each_netdev_safe(net, dev, aux)
1541 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1542 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1543 dev->rtnl_link_ops == &ip6erspan_tap_ops)
1544 unregister_netdevice_queue(dev, head);
1545
1546 for (prio = 0; prio < 4; prio++) {
1547 int h;
1548 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1549 struct ip6_tnl *t;
1550
1551 t = rtnl_dereference(ign->tunnels[prio][h]);
1552
1553 while (t) {
1554 /* If dev is in the same netns, it has already
1555 * been added to the list by the previous loop.
1556 */
1557 if (!net_eq(dev_net(t->dev), net))
1558 unregister_netdevice_queue(t->dev,
1559 head);
1560 t = rtnl_dereference(t->next);
1561 }
1562 }
1563 }
1564 }
1565
1566 static int __net_init ip6gre_init_net(struct net *net)
1567 {
1568 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1569 int err;
1570
1571 if (!net_has_fallback_tunnels(net))
1572 return 0;
1573 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1574 NET_NAME_UNKNOWN,
1575 ip6gre_tunnel_setup);
1576 if (!ign->fb_tunnel_dev) {
1577 err = -ENOMEM;
1578 goto err_alloc_dev;
1579 }
1580 dev_net_set(ign->fb_tunnel_dev, net);
1581 /* FB netdevice is special: we have one, and only one per netns.
1582 * Allowing to move it to another netns is clearly unsafe.
1583 */
1584 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1585
1586
1587 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1588 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1589
1590 err = register_netdev(ign->fb_tunnel_dev);
1591 if (err)
1592 goto err_reg_dev;
1593
1594 rcu_assign_pointer(ign->tunnels_wc[0],
1595 netdev_priv(ign->fb_tunnel_dev));
1596 return 0;
1597
1598 err_reg_dev:
1599 free_netdev(ign->fb_tunnel_dev);
1600 err_alloc_dev:
1601 return err;
1602 }
1603
1604 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1605 {
1606 struct net *net;
1607 LIST_HEAD(list);
1608
1609 rtnl_lock();
1610 list_for_each_entry(net, net_list, exit_list)
1611 ip6gre_destroy_tunnels(net, &list);
1612 unregister_netdevice_many(&list);
1613 rtnl_unlock();
1614 }
1615
1616 static struct pernet_operations ip6gre_net_ops = {
1617 .init = ip6gre_init_net,
1618 .exit_batch = ip6gre_exit_batch_net,
1619 .id = &ip6gre_net_id,
1620 .size = sizeof(struct ip6gre_net),
1621 };
1622
1623 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1624 struct netlink_ext_ack *extack)
1625 {
1626 __be16 flags;
1627
1628 if (!data)
1629 return 0;
1630
1631 flags = 0;
1632 if (data[IFLA_GRE_IFLAGS])
1633 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1634 if (data[IFLA_GRE_OFLAGS])
1635 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1636 if (flags & (GRE_VERSION|GRE_ROUTING))
1637 return -EINVAL;
1638
1639 return 0;
1640 }
1641
1642 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1643 struct netlink_ext_ack *extack)
1644 {
1645 struct in6_addr daddr;
1646
1647 if (tb[IFLA_ADDRESS]) {
1648 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1649 return -EINVAL;
1650 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1651 return -EADDRNOTAVAIL;
1652 }
1653
1654 if (!data)
1655 goto out;
1656
1657 if (data[IFLA_GRE_REMOTE]) {
1658 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1659 if (ipv6_addr_any(&daddr))
1660 return -EINVAL;
1661 }
1662
1663 out:
1664 return ip6gre_tunnel_validate(tb, data, extack);
1665 }
1666
1667 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1668 struct netlink_ext_ack *extack)
1669 {
1670 __be16 flags = 0;
1671 int ret, ver = 0;
1672
1673 if (!data)
1674 return 0;
1675
1676 ret = ip6gre_tap_validate(tb, data, extack);
1677 if (ret)
1678 return ret;
1679
1680 /* ERSPAN should only have GRE sequence and key flag */
1681 if (data[IFLA_GRE_OFLAGS])
1682 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1683 if (data[IFLA_GRE_IFLAGS])
1684 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1685 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1686 flags != (GRE_SEQ | GRE_KEY))
1687 return -EINVAL;
1688
1689 /* ERSPAN Session ID only has 10-bit. Since we reuse
1690 * 32-bit key field as ID, check it's range.
1691 */
1692 if (data[IFLA_GRE_IKEY] &&
1693 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1694 return -EINVAL;
1695
1696 if (data[IFLA_GRE_OKEY] &&
1697 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1698 return -EINVAL;
1699
1700 if (data[IFLA_GRE_ERSPAN_VER]) {
1701 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1702 if (ver != 1 && ver != 2)
1703 return -EINVAL;
1704 }
1705
1706 if (ver == 1) {
1707 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1708 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1709
1710 if (index & ~INDEX_MASK)
1711 return -EINVAL;
1712 }
1713 } else if (ver == 2) {
1714 if (data[IFLA_GRE_ERSPAN_DIR]) {
1715 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1716
1717 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1718 return -EINVAL;
1719 }
1720
1721 if (data[IFLA_GRE_ERSPAN_HWID]) {
1722 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1723
1724 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1725 return -EINVAL;
1726 }
1727 }
1728
1729 return 0;
1730 }
1731
1732 static void ip6gre_netlink_parms(struct nlattr *data[],
1733 struct __ip6_tnl_parm *parms)
1734 {
1735 memset(parms, 0, sizeof(*parms));
1736
1737 if (!data)
1738 return;
1739
1740 if (data[IFLA_GRE_LINK])
1741 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1742
1743 if (data[IFLA_GRE_IFLAGS])
1744 parms->i_flags = gre_flags_to_tnl_flags(
1745 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1746
1747 if (data[IFLA_GRE_OFLAGS])
1748 parms->o_flags = gre_flags_to_tnl_flags(
1749 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1750
1751 if (data[IFLA_GRE_IKEY])
1752 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1753
1754 if (data[IFLA_GRE_OKEY])
1755 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1756
1757 if (data[IFLA_GRE_LOCAL])
1758 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1759
1760 if (data[IFLA_GRE_REMOTE])
1761 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1762
1763 if (data[IFLA_GRE_TTL])
1764 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1765
1766 if (data[IFLA_GRE_ENCAP_LIMIT])
1767 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1768
1769 if (data[IFLA_GRE_FLOWINFO])
1770 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1771
1772 if (data[IFLA_GRE_FLAGS])
1773 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1774
1775 if (data[IFLA_GRE_FWMARK])
1776 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1777
1778 if (data[IFLA_GRE_COLLECT_METADATA])
1779 parms->collect_md = true;
1780
1781 parms->erspan_ver = 1;
1782 if (data[IFLA_GRE_ERSPAN_VER])
1783 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1784
1785 if (parms->erspan_ver == 1) {
1786 if (data[IFLA_GRE_ERSPAN_INDEX])
1787 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1788 } else if (parms->erspan_ver == 2) {
1789 if (data[IFLA_GRE_ERSPAN_DIR])
1790 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1791 if (data[IFLA_GRE_ERSPAN_HWID])
1792 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1793 }
1794 }
1795
1796 static int ip6gre_tap_init(struct net_device *dev)
1797 {
1798 int ret;
1799
1800 ret = ip6gre_tunnel_init_common(dev);
1801 if (ret)
1802 return ret;
1803
1804 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1805
1806 return 0;
1807 }
1808
1809 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1810 .ndo_init = ip6gre_tap_init,
1811 .ndo_uninit = ip6gre_tunnel_uninit,
1812 .ndo_start_xmit = ip6gre_tunnel_xmit,
1813 .ndo_set_mac_address = eth_mac_addr,
1814 .ndo_validate_addr = eth_validate_addr,
1815 .ndo_change_mtu = ip6_tnl_change_mtu,
1816 .ndo_get_stats64 = ip_tunnel_get_stats64,
1817 .ndo_get_iflink = ip6_tnl_get_iflink,
1818 };
1819
1820 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1821 {
1822 int t_hlen;
1823
1824 tunnel->tun_hlen = 8;
1825 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1826 erspan_hdr_len(tunnel->parms.erspan_ver);
1827
1828 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1829 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1830 return t_hlen;
1831 }
1832
1833 static int ip6erspan_tap_init(struct net_device *dev)
1834 {
1835 struct ip6_tnl *tunnel;
1836 int t_hlen;
1837 int ret;
1838
1839 tunnel = netdev_priv(dev);
1840
1841 tunnel->dev = dev;
1842 tunnel->net = dev_net(dev);
1843 strcpy(tunnel->parms.name, dev->name);
1844
1845 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1846 if (!dev->tstats)
1847 return -ENOMEM;
1848
1849 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1850 if (ret)
1851 goto cleanup_alloc_pcpu_stats;
1852
1853 ret = gro_cells_init(&tunnel->gro_cells, dev);
1854 if (ret)
1855 goto cleanup_dst_cache_init;
1856
1857 t_hlen = ip6erspan_calc_hlen(tunnel);
1858 dev->mtu = ETH_DATA_LEN - t_hlen;
1859 if (dev->type == ARPHRD_ETHER)
1860 dev->mtu -= ETH_HLEN;
1861 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1862 dev->mtu -= 8;
1863
1864 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1865 ip6erspan_tnl_link_config(tunnel, 1);
1866
1867 return 0;
1868
1869 cleanup_dst_cache_init:
1870 dst_cache_destroy(&tunnel->dst_cache);
1871 cleanup_alloc_pcpu_stats:
1872 free_percpu(dev->tstats);
1873 dev->tstats = NULL;
1874 return ret;
1875 }
1876
1877 static const struct net_device_ops ip6erspan_netdev_ops = {
1878 .ndo_init = ip6erspan_tap_init,
1879 .ndo_uninit = ip6erspan_tunnel_uninit,
1880 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1881 .ndo_set_mac_address = eth_mac_addr,
1882 .ndo_validate_addr = eth_validate_addr,
1883 .ndo_change_mtu = ip6_tnl_change_mtu,
1884 .ndo_get_stats64 = ip_tunnel_get_stats64,
1885 .ndo_get_iflink = ip6_tnl_get_iflink,
1886 };
1887
1888 static void ip6gre_tap_setup(struct net_device *dev)
1889 {
1890
1891 ether_setup(dev);
1892
1893 dev->max_mtu = 0;
1894 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1895 dev->needs_free_netdev = true;
1896 dev->priv_destructor = ip6gre_dev_free;
1897
1898 dev->features |= NETIF_F_NETNS_LOCAL;
1899 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1900 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1901 netif_keep_dst(dev);
1902 }
1903
1904 bool is_ip6gretap_dev(const struct net_device *dev)
1905 {
1906 return dev->netdev_ops == &ip6gre_tap_netdev_ops;
1907 }
1908 EXPORT_SYMBOL_GPL(is_ip6gretap_dev);
1909
1910 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1911 struct ip_tunnel_encap *ipencap)
1912 {
1913 bool ret = false;
1914
1915 memset(ipencap, 0, sizeof(*ipencap));
1916
1917 if (!data)
1918 return ret;
1919
1920 if (data[IFLA_GRE_ENCAP_TYPE]) {
1921 ret = true;
1922 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1923 }
1924
1925 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1926 ret = true;
1927 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1928 }
1929
1930 if (data[IFLA_GRE_ENCAP_SPORT]) {
1931 ret = true;
1932 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1933 }
1934
1935 if (data[IFLA_GRE_ENCAP_DPORT]) {
1936 ret = true;
1937 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1938 }
1939
1940 return ret;
1941 }
1942
1943 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1944 struct nlattr *tb[], struct nlattr *data[],
1945 struct netlink_ext_ack *extack)
1946 {
1947 struct ip6_tnl *nt;
1948 struct ip_tunnel_encap ipencap;
1949 int err;
1950
1951 nt = netdev_priv(dev);
1952
1953 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1954 int err = ip6_tnl_encap_setup(nt, &ipencap);
1955
1956 if (err < 0)
1957 return err;
1958 }
1959
1960 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1961 eth_hw_addr_random(dev);
1962
1963 nt->dev = dev;
1964 nt->net = dev_net(dev);
1965
1966 err = register_netdevice(dev);
1967 if (err)
1968 goto out;
1969
1970 if (tb[IFLA_MTU])
1971 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1972
1973 dev_hold(dev);
1974
1975 out:
1976 return err;
1977 }
1978
1979 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1980 struct nlattr *tb[], struct nlattr *data[],
1981 struct netlink_ext_ack *extack)
1982 {
1983 struct ip6_tnl *nt = netdev_priv(dev);
1984 struct net *net = dev_net(dev);
1985 struct ip6gre_net *ign;
1986 int err;
1987
1988 ip6gre_netlink_parms(data, &nt->parms);
1989 ign = net_generic(net, ip6gre_net_id);
1990
1991 if (nt->parms.collect_md) {
1992 if (rtnl_dereference(ign->collect_md_tun))
1993 return -EEXIST;
1994 } else {
1995 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1996 return -EEXIST;
1997 }
1998
1999 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2000 if (!err) {
2001 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
2002 ip6gre_tunnel_link_md(ign, nt);
2003 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2004 }
2005 return err;
2006 }
2007
2008 static struct ip6_tnl *
2009 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2010 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2011 struct netlink_ext_ack *extack)
2012 {
2013 struct ip6_tnl *t, *nt = netdev_priv(dev);
2014 struct net *net = nt->net;
2015 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2016 struct ip_tunnel_encap ipencap;
2017
2018 if (dev == ign->fb_tunnel_dev)
2019 return ERR_PTR(-EINVAL);
2020
2021 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2022 int err = ip6_tnl_encap_setup(nt, &ipencap);
2023
2024 if (err < 0)
2025 return ERR_PTR(err);
2026 }
2027
2028 ip6gre_netlink_parms(data, p_p);
2029
2030 t = ip6gre_tunnel_locate(net, p_p, 0);
2031
2032 if (t) {
2033 if (t->dev != dev)
2034 return ERR_PTR(-EEXIST);
2035 } else {
2036 t = nt;
2037 }
2038
2039 return t;
2040 }
2041
2042 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2043 struct nlattr *data[],
2044 struct netlink_ext_ack *extack)
2045 {
2046 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2047 struct __ip6_tnl_parm p;
2048 struct ip6_tnl *t;
2049
2050 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2051 if (IS_ERR(t))
2052 return PTR_ERR(t);
2053
2054 ip6gre_tunnel_unlink_md(ign, t);
2055 ip6gre_tunnel_unlink(ign, t);
2056 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2057 ip6gre_tunnel_link_md(ign, t);
2058 ip6gre_tunnel_link(ign, t);
2059 return 0;
2060 }
2061
2062 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2063 {
2064 struct net *net = dev_net(dev);
2065 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2066
2067 if (dev != ign->fb_tunnel_dev)
2068 unregister_netdevice_queue(dev, head);
2069 }
2070
2071 static size_t ip6gre_get_size(const struct net_device *dev)
2072 {
2073 return
2074 /* IFLA_GRE_LINK */
2075 nla_total_size(4) +
2076 /* IFLA_GRE_IFLAGS */
2077 nla_total_size(2) +
2078 /* IFLA_GRE_OFLAGS */
2079 nla_total_size(2) +
2080 /* IFLA_GRE_IKEY */
2081 nla_total_size(4) +
2082 /* IFLA_GRE_OKEY */
2083 nla_total_size(4) +
2084 /* IFLA_GRE_LOCAL */
2085 nla_total_size(sizeof(struct in6_addr)) +
2086 /* IFLA_GRE_REMOTE */
2087 nla_total_size(sizeof(struct in6_addr)) +
2088 /* IFLA_GRE_TTL */
2089 nla_total_size(1) +
2090 /* IFLA_GRE_ENCAP_LIMIT */
2091 nla_total_size(1) +
2092 /* IFLA_GRE_FLOWINFO */
2093 nla_total_size(4) +
2094 /* IFLA_GRE_FLAGS */
2095 nla_total_size(4) +
2096 /* IFLA_GRE_ENCAP_TYPE */
2097 nla_total_size(2) +
2098 /* IFLA_GRE_ENCAP_FLAGS */
2099 nla_total_size(2) +
2100 /* IFLA_GRE_ENCAP_SPORT */
2101 nla_total_size(2) +
2102 /* IFLA_GRE_ENCAP_DPORT */
2103 nla_total_size(2) +
2104 /* IFLA_GRE_COLLECT_METADATA */
2105 nla_total_size(0) +
2106 /* IFLA_GRE_FWMARK */
2107 nla_total_size(4) +
2108 /* IFLA_GRE_ERSPAN_INDEX */
2109 nla_total_size(4) +
2110 0;
2111 }
2112
2113 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2114 {
2115 struct ip6_tnl *t = netdev_priv(dev);
2116 struct __ip6_tnl_parm *p = &t->parms;
2117
2118 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2119 nla_put_be16(skb, IFLA_GRE_IFLAGS,
2120 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2121 nla_put_be16(skb, IFLA_GRE_OFLAGS,
2122 gre_tnl_flags_to_gre_flags(p->o_flags)) ||
2123 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2124 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2125 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2126 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2127 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2128 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2129 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2130 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2131 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark) ||
2132 nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2133 goto nla_put_failure;
2134
2135 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2136 t->encap.type) ||
2137 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2138 t->encap.sport) ||
2139 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2140 t->encap.dport) ||
2141 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2142 t->encap.flags))
2143 goto nla_put_failure;
2144
2145 if (p->collect_md) {
2146 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2147 goto nla_put_failure;
2148 }
2149
2150 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2151 goto nla_put_failure;
2152
2153 if (p->erspan_ver == 1) {
2154 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2155 goto nla_put_failure;
2156 } else if (p->erspan_ver == 2) {
2157 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2158 goto nla_put_failure;
2159 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2160 goto nla_put_failure;
2161 }
2162
2163 return 0;
2164
2165 nla_put_failure:
2166 return -EMSGSIZE;
2167 }
2168
2169 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2170 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2171 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2172 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2173 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2174 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2175 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
2176 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
2177 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2178 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2179 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2180 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
2181 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2182 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2183 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2184 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
2185 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2186 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
2187 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2188 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2189 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2190 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
2191 };
2192
2193 static void ip6erspan_tap_setup(struct net_device *dev)
2194 {
2195 ether_setup(dev);
2196
2197 dev->netdev_ops = &ip6erspan_netdev_ops;
2198 dev->needs_free_netdev = true;
2199 dev->priv_destructor = ip6gre_dev_free;
2200
2201 dev->features |= NETIF_F_NETNS_LOCAL;
2202 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2203 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2204 netif_keep_dst(dev);
2205 }
2206
2207 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2208 struct nlattr *tb[], struct nlattr *data[],
2209 struct netlink_ext_ack *extack)
2210 {
2211 struct ip6_tnl *nt = netdev_priv(dev);
2212 struct net *net = dev_net(dev);
2213 struct ip6gre_net *ign;
2214 int err;
2215
2216 ip6gre_netlink_parms(data, &nt->parms);
2217 ign = net_generic(net, ip6gre_net_id);
2218
2219 if (nt->parms.collect_md) {
2220 if (rtnl_dereference(ign->collect_md_tun_erspan))
2221 return -EEXIST;
2222 } else {
2223 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2224 return -EEXIST;
2225 }
2226
2227 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2228 if (!err) {
2229 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2230 ip6erspan_tunnel_link_md(ign, nt);
2231 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2232 }
2233 return err;
2234 }
2235
2236 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2237 {
2238 ip6gre_tnl_link_config_common(t);
2239 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2240 }
2241
2242 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2243 const struct __ip6_tnl_parm *p, int set_mtu)
2244 {
2245 ip6gre_tnl_copy_tnl_parm(t, p);
2246 ip6erspan_tnl_link_config(t, set_mtu);
2247 return 0;
2248 }
2249
2250 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2251 struct nlattr *data[],
2252 struct netlink_ext_ack *extack)
2253 {
2254 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2255 struct __ip6_tnl_parm p;
2256 struct ip6_tnl *t;
2257
2258 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2259 if (IS_ERR(t))
2260 return PTR_ERR(t);
2261
2262 ip6gre_tunnel_unlink_md(ign, t);
2263 ip6gre_tunnel_unlink(ign, t);
2264 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2265 ip6erspan_tunnel_link_md(ign, t);
2266 ip6gre_tunnel_link(ign, t);
2267 return 0;
2268 }
2269
2270 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2271 .kind = "ip6gre",
2272 .maxtype = IFLA_GRE_MAX,
2273 .policy = ip6gre_policy,
2274 .priv_size = sizeof(struct ip6_tnl),
2275 .setup = ip6gre_tunnel_setup,
2276 .validate = ip6gre_tunnel_validate,
2277 .newlink = ip6gre_newlink,
2278 .changelink = ip6gre_changelink,
2279 .dellink = ip6gre_dellink,
2280 .get_size = ip6gre_get_size,
2281 .fill_info = ip6gre_fill_info,
2282 .get_link_net = ip6_tnl_get_link_net,
2283 };
2284
2285 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2286 .kind = "ip6gretap",
2287 .maxtype = IFLA_GRE_MAX,
2288 .policy = ip6gre_policy,
2289 .priv_size = sizeof(struct ip6_tnl),
2290 .setup = ip6gre_tap_setup,
2291 .validate = ip6gre_tap_validate,
2292 .newlink = ip6gre_newlink,
2293 .changelink = ip6gre_changelink,
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 ip6erspan_tap_ops __read_mostly = {
2300 .kind = "ip6erspan",
2301 .maxtype = IFLA_GRE_MAX,
2302 .policy = ip6gre_policy,
2303 .priv_size = sizeof(struct ip6_tnl),
2304 .setup = ip6erspan_tap_setup,
2305 .validate = ip6erspan_tap_validate,
2306 .newlink = ip6erspan_newlink,
2307 .changelink = ip6erspan_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 /*
2314 * And now the modules code and kernel interface.
2315 */
2316
2317 static int __init ip6gre_init(void)
2318 {
2319 int err;
2320
2321 pr_info("GRE over IPv6 tunneling driver\n");
2322
2323 err = register_pernet_device(&ip6gre_net_ops);
2324 if (err < 0)
2325 return err;
2326
2327 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2328 if (err < 0) {
2329 pr_info("%s: can't add protocol\n", __func__);
2330 goto add_proto_failed;
2331 }
2332
2333 err = rtnl_link_register(&ip6gre_link_ops);
2334 if (err < 0)
2335 goto rtnl_link_failed;
2336
2337 err = rtnl_link_register(&ip6gre_tap_ops);
2338 if (err < 0)
2339 goto tap_ops_failed;
2340
2341 err = rtnl_link_register(&ip6erspan_tap_ops);
2342 if (err < 0)
2343 goto erspan_link_failed;
2344
2345 out:
2346 return err;
2347
2348 erspan_link_failed:
2349 rtnl_link_unregister(&ip6gre_tap_ops);
2350 tap_ops_failed:
2351 rtnl_link_unregister(&ip6gre_link_ops);
2352 rtnl_link_failed:
2353 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2354 add_proto_failed:
2355 unregister_pernet_device(&ip6gre_net_ops);
2356 goto out;
2357 }
2358
2359 static void __exit ip6gre_fini(void)
2360 {
2361 rtnl_link_unregister(&ip6gre_tap_ops);
2362 rtnl_link_unregister(&ip6gre_link_ops);
2363 rtnl_link_unregister(&ip6erspan_tap_ops);
2364 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2365 unregister_pernet_device(&ip6gre_net_ops);
2366 }
2367
2368 module_init(ip6gre_init);
2369 module_exit(ip6gre_fini);
2370 MODULE_LICENSE("GPL");
2371 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2372 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2373 MODULE_ALIAS_RTNL_LINK("ip6gre");
2374 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2375 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2376 MODULE_ALIAS_NETDEV("ip6gre0");
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