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net: Drop pernet_operations::async
[linux-2.6/btrfs-unstable.git] / net / ipv6 / ip6_gre.c
blob22e86557aca45baa79b224f9319c0a7213f29ebb
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 net_device *fb_tunnel_dev;
75 };
76
77 static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
78 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
79 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly;
80 static int ip6gre_tunnel_init(struct net_device *dev);
81 static void ip6gre_tunnel_setup(struct net_device *dev);
82 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
83 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
84
85 /* Tunnel hash table */
86
87 /*
88 4 hash tables:
89
90 3: (remote,local)
91 2: (remote,*)
92 1: (*,local)
93 0: (*,*)
94
95 We require exact key match i.e. if a key is present in packet
96 it will match only tunnel with the same key; if it is not present,
97 it will match only keyless tunnel.
98
99 All keysless packets, if not matched configured keyless tunnels
100 will match fallback tunnel.
101 */
102
103 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
104 static u32 HASH_ADDR(const struct in6_addr *addr)
105 {
106 u32 hash = ipv6_addr_hash(addr);
107
108 return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
109 }
110
111 #define tunnels_r_l tunnels[3]
112 #define tunnels_r tunnels[2]
113 #define tunnels_l tunnels[1]
114 #define tunnels_wc tunnels[0]
115
116 /* Given src, dst and key, find appropriate for input tunnel. */
117
118 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
119 const struct in6_addr *remote, const struct in6_addr *local,
120 __be32 key, __be16 gre_proto)
121 {
122 struct net *net = dev_net(dev);
123 int link = dev->ifindex;
124 unsigned int h0 = HASH_ADDR(remote);
125 unsigned int h1 = HASH_KEY(key);
126 struct ip6_tnl *t, *cand = NULL;
127 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
128 int dev_type = (gre_proto == htons(ETH_P_TEB) ||
129 gre_proto == htons(ETH_P_ERSPAN) ||
130 gre_proto == htons(ETH_P_ERSPAN2)) ?
131 ARPHRD_ETHER : ARPHRD_IP6GRE;
132 int score, cand_score = 4;
133
134 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
135 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
136 !ipv6_addr_equal(remote, &t->parms.raddr) ||
137 key != t->parms.i_key ||
138 !(t->dev->flags & IFF_UP))
139 continue;
140
141 if (t->dev->type != ARPHRD_IP6GRE &&
142 t->dev->type != dev_type)
143 continue;
144
145 score = 0;
146 if (t->parms.link != link)
147 score |= 1;
148 if (t->dev->type != dev_type)
149 score |= 2;
150 if (score == 0)
151 return t;
152
153 if (score < cand_score) {
154 cand = t;
155 cand_score = score;
156 }
157 }
158
159 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
160 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
161 key != t->parms.i_key ||
162 !(t->dev->flags & IFF_UP))
163 continue;
164
165 if (t->dev->type != ARPHRD_IP6GRE &&
166 t->dev->type != dev_type)
167 continue;
168
169 score = 0;
170 if (t->parms.link != link)
171 score |= 1;
172 if (t->dev->type != dev_type)
173 score |= 2;
174 if (score == 0)
175 return t;
176
177 if (score < cand_score) {
178 cand = t;
179 cand_score = score;
180 }
181 }
182
183 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
184 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
185 (!ipv6_addr_equal(local, &t->parms.raddr) ||
186 !ipv6_addr_is_multicast(local))) ||
187 key != t->parms.i_key ||
188 !(t->dev->flags & IFF_UP))
189 continue;
190
191 if (t->dev->type != ARPHRD_IP6GRE &&
192 t->dev->type != dev_type)
193 continue;
194
195 score = 0;
196 if (t->parms.link != link)
197 score |= 1;
198 if (t->dev->type != dev_type)
199 score |= 2;
200 if (score == 0)
201 return t;
202
203 if (score < cand_score) {
204 cand = t;
205 cand_score = score;
206 }
207 }
208
209 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
210 if (t->parms.i_key != key ||
211 !(t->dev->flags & IFF_UP))
212 continue;
213
214 if (t->dev->type != ARPHRD_IP6GRE &&
215 t->dev->type != dev_type)
216 continue;
217
218 score = 0;
219 if (t->parms.link != link)
220 score |= 1;
221 if (t->dev->type != dev_type)
222 score |= 2;
223 if (score == 0)
224 return t;
225
226 if (score < cand_score) {
227 cand = t;
228 cand_score = score;
229 }
230 }
231
232 if (cand)
233 return cand;
234
235 t = rcu_dereference(ign->collect_md_tun);
236 if (t && t->dev->flags & IFF_UP)
237 return t;
238
239 dev = ign->fb_tunnel_dev;
240 if (dev && dev->flags & IFF_UP)
241 return netdev_priv(dev);
242
243 return NULL;
244 }
245
246 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
247 const struct __ip6_tnl_parm *p)
248 {
249 const struct in6_addr *remote = &p->raddr;
250 const struct in6_addr *local = &p->laddr;
251 unsigned int h = HASH_KEY(p->i_key);
252 int prio = 0;
253
254 if (!ipv6_addr_any(local))
255 prio |= 1;
256 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
257 prio |= 2;
258 h ^= HASH_ADDR(remote);
259 }
260
261 return &ign->tunnels[prio][h];
262 }
263
264 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
265 const struct ip6_tnl *t)
266 {
267 return __ip6gre_bucket(ign, &t->parms);
268 }
269
270 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
271 {
272 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
273
274 if (t->parms.collect_md)
275 rcu_assign_pointer(ign->collect_md_tun, t);
276
277 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
278 rcu_assign_pointer(*tp, t);
279 }
280
281 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
282 {
283 struct ip6_tnl __rcu **tp;
284 struct ip6_tnl *iter;
285
286 if (t->parms.collect_md)
287 rcu_assign_pointer(ign->collect_md_tun, NULL);
288
289 for (tp = ip6gre_bucket(ign, t);
290 (iter = rtnl_dereference(*tp)) != NULL;
291 tp = &iter->next) {
292 if (t == iter) {
293 rcu_assign_pointer(*tp, t->next);
294 break;
295 }
296 }
297 }
298
299 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
300 const struct __ip6_tnl_parm *parms,
301 int type)
302 {
303 const struct in6_addr *remote = &parms->raddr;
304 const struct in6_addr *local = &parms->laddr;
305 __be32 key = parms->i_key;
306 int link = parms->link;
307 struct ip6_tnl *t;
308 struct ip6_tnl __rcu **tp;
309 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
310
311 for (tp = __ip6gre_bucket(ign, parms);
312 (t = rtnl_dereference(*tp)) != NULL;
313 tp = &t->next)
314 if (ipv6_addr_equal(local, &t->parms.laddr) &&
315 ipv6_addr_equal(remote, &t->parms.raddr) &&
316 key == t->parms.i_key &&
317 link == t->parms.link &&
318 type == t->dev->type)
319 break;
320
321 return t;
322 }
323
324 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
325 const struct __ip6_tnl_parm *parms, int create)
326 {
327 struct ip6_tnl *t, *nt;
328 struct net_device *dev;
329 char name[IFNAMSIZ];
330 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
331
332 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
333 if (t && create)
334 return NULL;
335 if (t || !create)
336 return t;
337
338 if (parms->name[0])
339 strlcpy(name, parms->name, IFNAMSIZ);
340 else
341 strcpy(name, "ip6gre%d");
342
343 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
344 ip6gre_tunnel_setup);
345 if (!dev)
346 return NULL;
347
348 dev_net_set(dev, net);
349
350 nt = netdev_priv(dev);
351 nt->parms = *parms;
352 dev->rtnl_link_ops = &ip6gre_link_ops;
353
354 nt->dev = dev;
355 nt->net = dev_net(dev);
356
357 if (register_netdevice(dev) < 0)
358 goto failed_free;
359
360 ip6gre_tnl_link_config(nt, 1);
361
362 /* Can use a lockless transmit, unless we generate output sequences */
363 if (!(nt->parms.o_flags & TUNNEL_SEQ))
364 dev->features |= NETIF_F_LLTX;
365
366 dev_hold(dev);
367 ip6gre_tunnel_link(ign, nt);
368 return nt;
369
370 failed_free:
371 free_netdev(dev);
372 return NULL;
373 }
374
375 static void ip6gre_tunnel_uninit(struct net_device *dev)
376 {
377 struct ip6_tnl *t = netdev_priv(dev);
378 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
379
380 ip6gre_tunnel_unlink(ign, t);
381 dst_cache_reset(&t->dst_cache);
382 dev_put(dev);
383 }
384
385
386 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
387 u8 type, u8 code, int offset, __be32 info)
388 {
389 struct net *net = dev_net(skb->dev);
390 const struct gre_base_hdr *greh;
391 const struct ipv6hdr *ipv6h;
392 int grehlen = sizeof(*greh);
393 struct ip6_tnl *t;
394 int key_off = 0;
395 __be16 flags;
396 __be32 key;
397
398 if (!pskb_may_pull(skb, offset + grehlen))
399 return;
400 greh = (const struct gre_base_hdr *)(skb->data + offset);
401 flags = greh->flags;
402 if (flags & (GRE_VERSION | GRE_ROUTING))
403 return;
404 if (flags & GRE_CSUM)
405 grehlen += 4;
406 if (flags & GRE_KEY) {
407 key_off = grehlen + offset;
408 grehlen += 4;
409 }
410
411 if (!pskb_may_pull(skb, offset + grehlen))
412 return;
413 ipv6h = (const struct ipv6hdr *)skb->data;
414 greh = (const struct gre_base_hdr *)(skb->data + offset);
415 key = key_off ? *(__be32 *)(skb->data + key_off) : 0;
416
417 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
418 key, greh->protocol);
419 if (!t)
420 return;
421
422 switch (type) {
423 struct ipv6_tlv_tnl_enc_lim *tel;
424 __u32 teli;
425 case ICMPV6_DEST_UNREACH:
426 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
427 t->parms.name);
428 if (code != ICMPV6_PORT_UNREACH)
429 break;
430 return;
431 case ICMPV6_TIME_EXCEED:
432 if (code == ICMPV6_EXC_HOPLIMIT) {
433 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
434 t->parms.name);
435 break;
436 }
437 return;
438 case ICMPV6_PARAMPROB:
439 teli = 0;
440 if (code == ICMPV6_HDR_FIELD)
441 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
442
443 if (teli && teli == be32_to_cpu(info) - 2) {
444 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
445 if (tel->encap_limit == 0) {
446 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
447 t->parms.name);
448 }
449 } else {
450 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
451 t->parms.name);
452 }
453 return;
454 case ICMPV6_PKT_TOOBIG:
455 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
456 return;
457 case NDISC_REDIRECT:
458 ip6_redirect(skb, net, skb->dev->ifindex, 0,
459 sock_net_uid(net, NULL));
460 return;
461 }
462
463 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
464 t->err_count++;
465 else
466 t->err_count = 1;
467 t->err_time = jiffies;
468 }
469
470 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
471 {
472 const struct ipv6hdr *ipv6h;
473 struct ip6_tnl *tunnel;
474
475 ipv6h = ipv6_hdr(skb);
476 tunnel = ip6gre_tunnel_lookup(skb->dev,
477 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
478 tpi->proto);
479 if (tunnel) {
480 if (tunnel->parms.collect_md) {
481 struct metadata_dst *tun_dst;
482 __be64 tun_id;
483 __be16 flags;
484
485 flags = tpi->flags;
486 tun_id = key32_to_tunnel_id(tpi->key);
487
488 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
489 if (!tun_dst)
490 return PACKET_REJECT;
491
492 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
493 } else {
494 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
495 }
496
497 return PACKET_RCVD;
498 }
499
500 return PACKET_REJECT;
501 }
502
503 static int ip6erspan_rcv(struct sk_buff *skb, int gre_hdr_len,
504 struct tnl_ptk_info *tpi)
505 {
506 struct erspan_base_hdr *ershdr;
507 struct erspan_metadata *pkt_md;
508 const struct ipv6hdr *ipv6h;
509 struct erspan_md2 *md2;
510 struct ip6_tnl *tunnel;
511 u8 ver;
512
513 if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr))))
514 return PACKET_REJECT;
515
516 ipv6h = ipv6_hdr(skb);
517 ershdr = (struct erspan_base_hdr *)skb->data;
518 ver = ershdr->ver;
519 tpi->key = cpu_to_be32(get_session_id(ershdr));
520
521 tunnel = ip6gre_tunnel_lookup(skb->dev,
522 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
523 tpi->proto);
524 if (tunnel) {
525 int len = erspan_hdr_len(ver);
526
527 if (unlikely(!pskb_may_pull(skb, len)))
528 return PACKET_REJECT;
529
530 ershdr = (struct erspan_base_hdr *)skb->data;
531 pkt_md = (struct erspan_metadata *)(ershdr + 1);
532
533 if (__iptunnel_pull_header(skb, len,
534 htons(ETH_P_TEB),
535 false, false) < 0)
536 return PACKET_REJECT;
537
538 if (tunnel->parms.collect_md) {
539 struct metadata_dst *tun_dst;
540 struct ip_tunnel_info *info;
541 struct erspan_metadata *md;
542 __be64 tun_id;
543 __be16 flags;
544
545 tpi->flags |= TUNNEL_KEY;
546 flags = tpi->flags;
547 tun_id = key32_to_tunnel_id(tpi->key);
548
549 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
550 sizeof(*md));
551 if (!tun_dst)
552 return PACKET_REJECT;
553
554 info = &tun_dst->u.tun_info;
555 md = ip_tunnel_info_opts(info);
556 md->version = ver;
557 md2 = &md->u.md2;
558 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
559 ERSPAN_V2_MDSIZE);
560 info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
561 info->options_len = sizeof(*md);
562
563 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
564
565 } else {
566 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
567 }
568
569 return PACKET_RCVD;
570 }
571
572 return PACKET_REJECT;
573 }
574
575 static int gre_rcv(struct sk_buff *skb)
576 {
577 struct tnl_ptk_info tpi;
578 bool csum_err = false;
579 int hdr_len;
580
581 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
582 if (hdr_len < 0)
583 goto drop;
584
585 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
586 goto drop;
587
588 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
589 tpi.proto == htons(ETH_P_ERSPAN2))) {
590 if (ip6erspan_rcv(skb, hdr_len, &tpi) == PACKET_RCVD)
591 return 0;
592 goto out;
593 }
594
595 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
596 return 0;
597
598 out:
599 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
600 drop:
601 kfree_skb(skb);
602 return 0;
603 }
604
605 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
606 {
607 return iptunnel_handle_offloads(skb,
608 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
609 }
610
611 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
612 struct net_device *dev,
613 struct flowi6 *fl6, __u8 *dsfield,
614 int *encap_limit)
615 {
616 const struct iphdr *iph = ip_hdr(skb);
617 struct ip6_tnl *t = netdev_priv(dev);
618
619 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
620 *encap_limit = t->parms.encap_limit;
621
622 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
623
624 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
625 *dsfield = ipv4_get_dsfield(iph);
626 else
627 *dsfield = ip6_tclass(t->parms.flowinfo);
628
629 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
630 fl6->flowi6_mark = skb->mark;
631 else
632 fl6->flowi6_mark = t->parms.fwmark;
633
634 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
635 }
636
637 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
638 struct net_device *dev,
639 struct flowi6 *fl6, __u8 *dsfield,
640 int *encap_limit)
641 {
642 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
643 struct ip6_tnl *t = netdev_priv(dev);
644 __u16 offset;
645
646 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
647 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
648
649 if (offset > 0) {
650 struct ipv6_tlv_tnl_enc_lim *tel;
651
652 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
653 if (tel->encap_limit == 0) {
654 icmpv6_send(skb, ICMPV6_PARAMPROB,
655 ICMPV6_HDR_FIELD, offset + 2);
656 return -1;
657 }
658 *encap_limit = tel->encap_limit - 1;
659 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
660 *encap_limit = t->parms.encap_limit;
661 }
662
663 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
664
665 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
666 *dsfield = ipv6_get_dsfield(ipv6h);
667 else
668 *dsfield = ip6_tclass(t->parms.flowinfo);
669
670 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
671 fl6->flowlabel |= ip6_flowlabel(ipv6h);
672
673 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
674 fl6->flowi6_mark = skb->mark;
675 else
676 fl6->flowi6_mark = t->parms.fwmark;
677
678 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
679
680 return 0;
681 }
682
683 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
684 struct net_device *dev, __u8 dsfield,
685 struct flowi6 *fl6, int encap_limit,
686 __u32 *pmtu, __be16 proto)
687 {
688 struct ip6_tnl *tunnel = netdev_priv(dev);
689 __be16 protocol;
690
691 if (dev->type == ARPHRD_ETHER)
692 IPCB(skb)->flags = 0;
693
694 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
695 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
696 else
697 fl6->daddr = tunnel->parms.raddr;
698
699 /* Push GRE header. */
700 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
701
702 if (tunnel->parms.collect_md) {
703 struct ip_tunnel_info *tun_info;
704 const struct ip_tunnel_key *key;
705 __be16 flags;
706
707 tun_info = skb_tunnel_info(skb);
708 if (unlikely(!tun_info ||
709 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
710 ip_tunnel_info_af(tun_info) != AF_INET6))
711 return -EINVAL;
712
713 key = &tun_info->key;
714 memset(fl6, 0, sizeof(*fl6));
715 fl6->flowi6_proto = IPPROTO_GRE;
716 fl6->daddr = key->u.ipv6.dst;
717 fl6->flowlabel = key->label;
718 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
719
720 dsfield = key->tos;
721 flags = key->tun_flags &
722 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
723 tunnel->tun_hlen = gre_calc_hlen(flags);
724
725 gre_build_header(skb, tunnel->tun_hlen,
726 flags, protocol,
727 tunnel_id_to_key32(tun_info->key.tun_id),
728 (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++)
729 : 0);
730
731 } else {
732 if (tunnel->parms.o_flags & TUNNEL_SEQ)
733 tunnel->o_seqno++;
734
735 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
736 protocol, tunnel->parms.o_key,
737 htonl(tunnel->o_seqno));
738 }
739
740 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
741 NEXTHDR_GRE);
742 }
743
744 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
745 {
746 struct ip6_tnl *t = netdev_priv(dev);
747 int encap_limit = -1;
748 struct flowi6 fl6;
749 __u8 dsfield = 0;
750 __u32 mtu;
751 int err;
752
753 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
754
755 if (!t->parms.collect_md)
756 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
757 &dsfield, &encap_limit);
758
759 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
760 if (err)
761 return -1;
762
763 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
764 skb->protocol);
765 if (err != 0) {
766 /* XXX: send ICMP error even if DF is not set. */
767 if (err == -EMSGSIZE)
768 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
769 htonl(mtu));
770 return -1;
771 }
772
773 return 0;
774 }
775
776 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
777 {
778 struct ip6_tnl *t = netdev_priv(dev);
779 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
780 int encap_limit = -1;
781 struct flowi6 fl6;
782 __u8 dsfield = 0;
783 __u32 mtu;
784 int err;
785
786 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
787 return -1;
788
789 if (!t->parms.collect_md &&
790 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
791 return -1;
792
793 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
794 return -1;
795
796 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
797 &mtu, skb->protocol);
798 if (err != 0) {
799 if (err == -EMSGSIZE)
800 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
801 return -1;
802 }
803
804 return 0;
805 }
806
807 /**
808 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
809 * @t: the outgoing tunnel device
810 * @hdr: IPv6 header from the incoming packet
811 *
812 * Description:
813 * Avoid trivial tunneling loop by checking that tunnel exit-point
814 * doesn't match source of incoming packet.
815 *
816 * Return:
817 * 1 if conflict,
818 * 0 else
819 **/
820
821 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
822 const struct ipv6hdr *hdr)
823 {
824 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
825 }
826
827 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
828 {
829 struct ip6_tnl *t = netdev_priv(dev);
830 int encap_limit = -1;
831 struct flowi6 fl6;
832 __u32 mtu;
833 int err;
834
835 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
836 encap_limit = t->parms.encap_limit;
837
838 if (!t->parms.collect_md)
839 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
840
841 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
842 if (err)
843 return err;
844
845 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
846
847 return err;
848 }
849
850 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
851 struct net_device *dev)
852 {
853 struct ip6_tnl *t = netdev_priv(dev);
854 struct net_device_stats *stats = &t->dev->stats;
855 int ret;
856
857 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
858 goto tx_err;
859
860 switch (skb->protocol) {
861 case htons(ETH_P_IP):
862 ret = ip6gre_xmit_ipv4(skb, dev);
863 break;
864 case htons(ETH_P_IPV6):
865 ret = ip6gre_xmit_ipv6(skb, dev);
866 break;
867 default:
868 ret = ip6gre_xmit_other(skb, dev);
869 break;
870 }
871
872 if (ret < 0)
873 goto tx_err;
874
875 return NETDEV_TX_OK;
876
877 tx_err:
878 stats->tx_errors++;
879 stats->tx_dropped++;
880 kfree_skb(skb);
881 return NETDEV_TX_OK;
882 }
883
884 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
885 struct net_device *dev)
886 {
887 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
888 struct ip6_tnl *t = netdev_priv(dev);
889 struct dst_entry *dst = skb_dst(skb);
890 struct net_device_stats *stats;
891 bool truncate = false;
892 int encap_limit = -1;
893 __u8 dsfield = false;
894 struct flowi6 fl6;
895 int err = -EINVAL;
896 __u32 mtu;
897
898 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
899 goto tx_err;
900
901 if (gre_handle_offloads(skb, false))
902 goto tx_err;
903
904 if (skb->len > dev->mtu + dev->hard_header_len) {
905 pskb_trim(skb, dev->mtu + dev->hard_header_len);
906 truncate = true;
907 }
908
909 if (skb_cow_head(skb, dev->needed_headroom))
910 goto tx_err;
911
912 t->parms.o_flags &= ~TUNNEL_KEY;
913 IPCB(skb)->flags = 0;
914
915 /* For collect_md mode, derive fl6 from the tunnel key,
916 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
917 */
918 if (t->parms.collect_md) {
919 struct ip_tunnel_info *tun_info;
920 const struct ip_tunnel_key *key;
921 struct erspan_metadata *md;
922 __be32 tun_id;
923
924 tun_info = skb_tunnel_info(skb);
925 if (unlikely(!tun_info ||
926 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
927 ip_tunnel_info_af(tun_info) != AF_INET6))
928 return -EINVAL;
929
930 key = &tun_info->key;
931 memset(&fl6, 0, sizeof(fl6));
932 fl6.flowi6_proto = IPPROTO_GRE;
933 fl6.daddr = key->u.ipv6.dst;
934 fl6.flowlabel = key->label;
935 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
936
937 dsfield = key->tos;
938 md = ip_tunnel_info_opts(tun_info);
939 if (!md)
940 goto tx_err;
941
942 tun_id = tunnel_id_to_key32(key->tun_id);
943 if (md->version == 1) {
944 erspan_build_header(skb,
945 ntohl(tun_id),
946 ntohl(md->u.index), truncate,
947 false);
948 } else if (md->version == 2) {
949 erspan_build_header_v2(skb,
950 ntohl(tun_id),
951 md->u.md2.dir,
952 get_hwid(&md->u.md2),
953 truncate, false);
954 } else {
955 goto tx_err;
956 }
957 } else {
958 switch (skb->protocol) {
959 case htons(ETH_P_IP):
960 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
961 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
962 &dsfield, &encap_limit);
963 break;
964 case htons(ETH_P_IPV6):
965 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
966 goto tx_err;
967 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
968 &dsfield, &encap_limit))
969 goto tx_err;
970 break;
971 default:
972 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
973 break;
974 }
975
976 if (t->parms.erspan_ver == 1)
977 erspan_build_header(skb, ntohl(t->parms.o_key),
978 t->parms.index,
979 truncate, false);
980 else
981 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
982 t->parms.dir,
983 t->parms.hwid,
984 truncate, false);
985 fl6.daddr = t->parms.raddr;
986 }
987
988 /* Push GRE header. */
989 gre_build_header(skb, 8, TUNNEL_SEQ,
990 htons(ETH_P_ERSPAN), 0, htonl(t->o_seqno++));
991
992 /* TooBig packet may have updated dst->dev's mtu */
993 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
994 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu);
995
996 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
997 NEXTHDR_GRE);
998 if (err != 0) {
999 /* XXX: send ICMP error even if DF is not set. */
1000 if (err == -EMSGSIZE) {
1001 if (skb->protocol == htons(ETH_P_IP))
1002 icmp_send(skb, ICMP_DEST_UNREACH,
1003 ICMP_FRAG_NEEDED, htonl(mtu));
1004 else
1005 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1006 }
1007
1008 goto tx_err;
1009 }
1010 return NETDEV_TX_OK;
1011
1012 tx_err:
1013 stats = &t->dev->stats;
1014 stats->tx_errors++;
1015 stats->tx_dropped++;
1016 kfree_skb(skb);
1017 return NETDEV_TX_OK;
1018 }
1019
1020 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1021 {
1022 struct net_device *dev = t->dev;
1023 struct __ip6_tnl_parm *p = &t->parms;
1024 struct flowi6 *fl6 = &t->fl.u.ip6;
1025 int t_hlen;
1026
1027 if (dev->type != ARPHRD_ETHER) {
1028 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1029 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1030 }
1031
1032 /* Set up flowi template */
1033 fl6->saddr = p->laddr;
1034 fl6->daddr = p->raddr;
1035 fl6->flowi6_oif = p->link;
1036 fl6->flowlabel = 0;
1037 fl6->flowi6_proto = IPPROTO_GRE;
1038
1039 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1040 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1041 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1042 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1043
1044 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1045 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1046
1047 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1048 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1049 dev->flags |= IFF_POINTOPOINT;
1050 else
1051 dev->flags &= ~IFF_POINTOPOINT;
1052
1053 t->tun_hlen = gre_calc_hlen(t->parms.o_flags);
1054
1055 t->hlen = t->encap_hlen + t->tun_hlen;
1056
1057 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1058
1059 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1060 int strict = (ipv6_addr_type(&p->raddr) &
1061 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1062
1063 struct rt6_info *rt = rt6_lookup(t->net,
1064 &p->raddr, &p->laddr,
1065 p->link, NULL, strict);
1066
1067 if (!rt)
1068 return;
1069
1070 if (rt->dst.dev) {
1071 dev->hard_header_len = rt->dst.dev->hard_header_len +
1072 t_hlen;
1073
1074 if (set_mtu) {
1075 dev->mtu = rt->dst.dev->mtu - t_hlen;
1076 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1077 dev->mtu -= 8;
1078 if (dev->type == ARPHRD_ETHER)
1079 dev->mtu -= ETH_HLEN;
1080
1081 if (dev->mtu < IPV6_MIN_MTU)
1082 dev->mtu = IPV6_MIN_MTU;
1083 }
1084 }
1085 ip6_rt_put(rt);
1086 }
1087 }
1088
1089 static int ip6gre_tnl_change(struct ip6_tnl *t,
1090 const struct __ip6_tnl_parm *p, int set_mtu)
1091 {
1092 t->parms.laddr = p->laddr;
1093 t->parms.raddr = p->raddr;
1094 t->parms.flags = p->flags;
1095 t->parms.hop_limit = p->hop_limit;
1096 t->parms.encap_limit = p->encap_limit;
1097 t->parms.flowinfo = p->flowinfo;
1098 t->parms.link = p->link;
1099 t->parms.proto = p->proto;
1100 t->parms.i_key = p->i_key;
1101 t->parms.o_key = p->o_key;
1102 t->parms.i_flags = p->i_flags;
1103 t->parms.o_flags = p->o_flags;
1104 t->parms.fwmark = p->fwmark;
1105 dst_cache_reset(&t->dst_cache);
1106 ip6gre_tnl_link_config(t, set_mtu);
1107 return 0;
1108 }
1109
1110 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1111 const struct ip6_tnl_parm2 *u)
1112 {
1113 p->laddr = u->laddr;
1114 p->raddr = u->raddr;
1115 p->flags = u->flags;
1116 p->hop_limit = u->hop_limit;
1117 p->encap_limit = u->encap_limit;
1118 p->flowinfo = u->flowinfo;
1119 p->link = u->link;
1120 p->i_key = u->i_key;
1121 p->o_key = u->o_key;
1122 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1123 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1124 memcpy(p->name, u->name, sizeof(u->name));
1125 }
1126
1127 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1128 const struct __ip6_tnl_parm *p)
1129 {
1130 u->proto = IPPROTO_GRE;
1131 u->laddr = p->laddr;
1132 u->raddr = p->raddr;
1133 u->flags = p->flags;
1134 u->hop_limit = p->hop_limit;
1135 u->encap_limit = p->encap_limit;
1136 u->flowinfo = p->flowinfo;
1137 u->link = p->link;
1138 u->i_key = p->i_key;
1139 u->o_key = p->o_key;
1140 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1141 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1142 memcpy(u->name, p->name, sizeof(u->name));
1143 }
1144
1145 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1146 struct ifreq *ifr, int cmd)
1147 {
1148 int err = 0;
1149 struct ip6_tnl_parm2 p;
1150 struct __ip6_tnl_parm p1;
1151 struct ip6_tnl *t = netdev_priv(dev);
1152 struct net *net = t->net;
1153 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1154
1155 memset(&p1, 0, sizeof(p1));
1156
1157 switch (cmd) {
1158 case SIOCGETTUNNEL:
1159 if (dev == ign->fb_tunnel_dev) {
1160 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1161 err = -EFAULT;
1162 break;
1163 }
1164 ip6gre_tnl_parm_from_user(&p1, &p);
1165 t = ip6gre_tunnel_locate(net, &p1, 0);
1166 if (!t)
1167 t = netdev_priv(dev);
1168 }
1169 memset(&p, 0, sizeof(p));
1170 ip6gre_tnl_parm_to_user(&p, &t->parms);
1171 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1172 err = -EFAULT;
1173 break;
1174
1175 case SIOCADDTUNNEL:
1176 case SIOCCHGTUNNEL:
1177 err = -EPERM;
1178 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1179 goto done;
1180
1181 err = -EFAULT;
1182 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1183 goto done;
1184
1185 err = -EINVAL;
1186 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1187 goto done;
1188
1189 if (!(p.i_flags&GRE_KEY))
1190 p.i_key = 0;
1191 if (!(p.o_flags&GRE_KEY))
1192 p.o_key = 0;
1193
1194 ip6gre_tnl_parm_from_user(&p1, &p);
1195 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1196
1197 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1198 if (t) {
1199 if (t->dev != dev) {
1200 err = -EEXIST;
1201 break;
1202 }
1203 } else {
1204 t = netdev_priv(dev);
1205
1206 ip6gre_tunnel_unlink(ign, t);
1207 synchronize_net();
1208 ip6gre_tnl_change(t, &p1, 1);
1209 ip6gre_tunnel_link(ign, t);
1210 netdev_state_change(dev);
1211 }
1212 }
1213
1214 if (t) {
1215 err = 0;
1216
1217 memset(&p, 0, sizeof(p));
1218 ip6gre_tnl_parm_to_user(&p, &t->parms);
1219 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1220 err = -EFAULT;
1221 } else
1222 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1223 break;
1224
1225 case SIOCDELTUNNEL:
1226 err = -EPERM;
1227 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1228 goto done;
1229
1230 if (dev == ign->fb_tunnel_dev) {
1231 err = -EFAULT;
1232 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1233 goto done;
1234 err = -ENOENT;
1235 ip6gre_tnl_parm_from_user(&p1, &p);
1236 t = ip6gre_tunnel_locate(net, &p1, 0);
1237 if (!t)
1238 goto done;
1239 err = -EPERM;
1240 if (t == netdev_priv(ign->fb_tunnel_dev))
1241 goto done;
1242 dev = t->dev;
1243 }
1244 unregister_netdevice(dev);
1245 err = 0;
1246 break;
1247
1248 default:
1249 err = -EINVAL;
1250 }
1251
1252 done:
1253 return err;
1254 }
1255
1256 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1257 unsigned short type, const void *daddr,
1258 const void *saddr, unsigned int len)
1259 {
1260 struct ip6_tnl *t = netdev_priv(dev);
1261 struct ipv6hdr *ipv6h;
1262 __be16 *p;
1263
1264 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1265 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1266 t->fl.u.ip6.flowlabel,
1267 true, &t->fl.u.ip6));
1268 ipv6h->hop_limit = t->parms.hop_limit;
1269 ipv6h->nexthdr = NEXTHDR_GRE;
1270 ipv6h->saddr = t->parms.laddr;
1271 ipv6h->daddr = t->parms.raddr;
1272
1273 p = (__be16 *)(ipv6h + 1);
1274 p[0] = t->parms.o_flags;
1275 p[1] = htons(type);
1276
1277 /*
1278 * Set the source hardware address.
1279 */
1280
1281 if (saddr)
1282 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1283 if (daddr)
1284 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1285 if (!ipv6_addr_any(&ipv6h->daddr))
1286 return t->hlen;
1287
1288 return -t->hlen;
1289 }
1290
1291 static const struct header_ops ip6gre_header_ops = {
1292 .create = ip6gre_header,
1293 };
1294
1295 static const struct net_device_ops ip6gre_netdev_ops = {
1296 .ndo_init = ip6gre_tunnel_init,
1297 .ndo_uninit = ip6gre_tunnel_uninit,
1298 .ndo_start_xmit = ip6gre_tunnel_xmit,
1299 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1300 .ndo_change_mtu = ip6_tnl_change_mtu,
1301 .ndo_get_stats64 = ip_tunnel_get_stats64,
1302 .ndo_get_iflink = ip6_tnl_get_iflink,
1303 };
1304
1305 static void ip6gre_dev_free(struct net_device *dev)
1306 {
1307 struct ip6_tnl *t = netdev_priv(dev);
1308
1309 dst_cache_destroy(&t->dst_cache);
1310 free_percpu(dev->tstats);
1311 }
1312
1313 static void ip6gre_tunnel_setup(struct net_device *dev)
1314 {
1315 dev->netdev_ops = &ip6gre_netdev_ops;
1316 dev->needs_free_netdev = true;
1317 dev->priv_destructor = ip6gre_dev_free;
1318
1319 dev->type = ARPHRD_IP6GRE;
1320
1321 dev->flags |= IFF_NOARP;
1322 dev->addr_len = sizeof(struct in6_addr);
1323 netif_keep_dst(dev);
1324 /* This perm addr will be used as interface identifier by IPv6 */
1325 dev->addr_assign_type = NET_ADDR_RANDOM;
1326 eth_random_addr(dev->perm_addr);
1327 }
1328
1329 #define GRE6_FEATURES (NETIF_F_SG | \
1330 NETIF_F_FRAGLIST | \
1331 NETIF_F_HIGHDMA | \
1332 NETIF_F_HW_CSUM)
1333
1334 static void ip6gre_tnl_init_features(struct net_device *dev)
1335 {
1336 struct ip6_tnl *nt = netdev_priv(dev);
1337
1338 dev->features |= GRE6_FEATURES;
1339 dev->hw_features |= GRE6_FEATURES;
1340
1341 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1342 /* TCP offload with GRE SEQ is not supported, nor
1343 * can we support 2 levels of outer headers requiring
1344 * an update.
1345 */
1346 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1347 nt->encap.type == TUNNEL_ENCAP_NONE) {
1348 dev->features |= NETIF_F_GSO_SOFTWARE;
1349 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1350 }
1351
1352 /* Can use a lockless transmit, unless we generate
1353 * output sequences
1354 */
1355 dev->features |= NETIF_F_LLTX;
1356 }
1357 }
1358
1359 static int ip6gre_tunnel_init_common(struct net_device *dev)
1360 {
1361 struct ip6_tnl *tunnel;
1362 int ret;
1363 int t_hlen;
1364
1365 tunnel = netdev_priv(dev);
1366
1367 tunnel->dev = dev;
1368 tunnel->net = dev_net(dev);
1369 strcpy(tunnel->parms.name, dev->name);
1370
1371 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1372 if (!dev->tstats)
1373 return -ENOMEM;
1374
1375 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1376 if (ret) {
1377 free_percpu(dev->tstats);
1378 dev->tstats = NULL;
1379 return ret;
1380 }
1381
1382 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1383 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1384 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1385
1386 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1387 dev->mtu = ETH_DATA_LEN - t_hlen;
1388 if (dev->type == ARPHRD_ETHER)
1389 dev->mtu -= ETH_HLEN;
1390 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1391 dev->mtu -= 8;
1392
1393 if (tunnel->parms.collect_md) {
1394 dev->features |= NETIF_F_NETNS_LOCAL;
1395 netif_keep_dst(dev);
1396 }
1397 ip6gre_tnl_init_features(dev);
1398
1399 return 0;
1400 }
1401
1402 static int ip6gre_tunnel_init(struct net_device *dev)
1403 {
1404 struct ip6_tnl *tunnel;
1405 int ret;
1406
1407 ret = ip6gre_tunnel_init_common(dev);
1408 if (ret)
1409 return ret;
1410
1411 tunnel = netdev_priv(dev);
1412
1413 if (tunnel->parms.collect_md)
1414 return 0;
1415
1416 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1417 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1418
1419 if (ipv6_addr_any(&tunnel->parms.raddr))
1420 dev->header_ops = &ip6gre_header_ops;
1421
1422 return 0;
1423 }
1424
1425 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1426 {
1427 struct ip6_tnl *tunnel = netdev_priv(dev);
1428
1429 tunnel->dev = dev;
1430 tunnel->net = dev_net(dev);
1431 strcpy(tunnel->parms.name, dev->name);
1432
1433 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1434
1435 dev_hold(dev);
1436 }
1437
1438 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1439 .handler = gre_rcv,
1440 .err_handler = ip6gre_err,
1441 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1442 };
1443
1444 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1445 {
1446 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1447 struct net_device *dev, *aux;
1448 int prio;
1449
1450 for_each_netdev_safe(net, dev, aux)
1451 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1452 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1453 dev->rtnl_link_ops == &ip6erspan_tap_ops)
1454 unregister_netdevice_queue(dev, head);
1455
1456 for (prio = 0; prio < 4; prio++) {
1457 int h;
1458 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1459 struct ip6_tnl *t;
1460
1461 t = rtnl_dereference(ign->tunnels[prio][h]);
1462
1463 while (t) {
1464 /* If dev is in the same netns, it has already
1465 * been added to the list by the previous loop.
1466 */
1467 if (!net_eq(dev_net(t->dev), net))
1468 unregister_netdevice_queue(t->dev,
1469 head);
1470 t = rtnl_dereference(t->next);
1471 }
1472 }
1473 }
1474 }
1475
1476 static int __net_init ip6gre_init_net(struct net *net)
1477 {
1478 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1479 int err;
1480
1481 if (!net_has_fallback_tunnels(net))
1482 return 0;
1483 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1484 NET_NAME_UNKNOWN,
1485 ip6gre_tunnel_setup);
1486 if (!ign->fb_tunnel_dev) {
1487 err = -ENOMEM;
1488 goto err_alloc_dev;
1489 }
1490 dev_net_set(ign->fb_tunnel_dev, net);
1491 /* FB netdevice is special: we have one, and only one per netns.
1492 * Allowing to move it to another netns is clearly unsafe.
1493 */
1494 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1495
1496
1497 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1498 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1499
1500 err = register_netdev(ign->fb_tunnel_dev);
1501 if (err)
1502 goto err_reg_dev;
1503
1504 rcu_assign_pointer(ign->tunnels_wc[0],
1505 netdev_priv(ign->fb_tunnel_dev));
1506 return 0;
1507
1508 err_reg_dev:
1509 free_netdev(ign->fb_tunnel_dev);
1510 err_alloc_dev:
1511 return err;
1512 }
1513
1514 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1515 {
1516 struct net *net;
1517 LIST_HEAD(list);
1518
1519 rtnl_lock();
1520 list_for_each_entry(net, net_list, exit_list)
1521 ip6gre_destroy_tunnels(net, &list);
1522 unregister_netdevice_many(&list);
1523 rtnl_unlock();
1524 }
1525
1526 static struct pernet_operations ip6gre_net_ops = {
1527 .init = ip6gre_init_net,
1528 .exit_batch = ip6gre_exit_batch_net,
1529 .id = &ip6gre_net_id,
1530 .size = sizeof(struct ip6gre_net),
1531 };
1532
1533 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1534 struct netlink_ext_ack *extack)
1535 {
1536 __be16 flags;
1537
1538 if (!data)
1539 return 0;
1540
1541 flags = 0;
1542 if (data[IFLA_GRE_IFLAGS])
1543 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1544 if (data[IFLA_GRE_OFLAGS])
1545 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1546 if (flags & (GRE_VERSION|GRE_ROUTING))
1547 return -EINVAL;
1548
1549 return 0;
1550 }
1551
1552 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1553 struct netlink_ext_ack *extack)
1554 {
1555 struct in6_addr daddr;
1556
1557 if (tb[IFLA_ADDRESS]) {
1558 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1559 return -EINVAL;
1560 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1561 return -EADDRNOTAVAIL;
1562 }
1563
1564 if (!data)
1565 goto out;
1566
1567 if (data[IFLA_GRE_REMOTE]) {
1568 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1569 if (ipv6_addr_any(&daddr))
1570 return -EINVAL;
1571 }
1572
1573 out:
1574 return ip6gre_tunnel_validate(tb, data, extack);
1575 }
1576
1577 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1578 struct netlink_ext_ack *extack)
1579 {
1580 __be16 flags = 0;
1581 int ret, ver = 0;
1582
1583 if (!data)
1584 return 0;
1585
1586 ret = ip6gre_tap_validate(tb, data, extack);
1587 if (ret)
1588 return ret;
1589
1590 /* ERSPAN should only have GRE sequence and key flag */
1591 if (data[IFLA_GRE_OFLAGS])
1592 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1593 if (data[IFLA_GRE_IFLAGS])
1594 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1595 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1596 flags != (GRE_SEQ | GRE_KEY))
1597 return -EINVAL;
1598
1599 /* ERSPAN Session ID only has 10-bit. Since we reuse
1600 * 32-bit key field as ID, check it's range.
1601 */
1602 if (data[IFLA_GRE_IKEY] &&
1603 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1604 return -EINVAL;
1605
1606 if (data[IFLA_GRE_OKEY] &&
1607 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1608 return -EINVAL;
1609
1610 if (data[IFLA_GRE_ERSPAN_VER]) {
1611 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1612 if (ver != 1 && ver != 2)
1613 return -EINVAL;
1614 }
1615
1616 if (ver == 1) {
1617 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1618 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1619
1620 if (index & ~INDEX_MASK)
1621 return -EINVAL;
1622 }
1623 } else if (ver == 2) {
1624 if (data[IFLA_GRE_ERSPAN_DIR]) {
1625 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1626
1627 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1628 return -EINVAL;
1629 }
1630
1631 if (data[IFLA_GRE_ERSPAN_HWID]) {
1632 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1633
1634 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1635 return -EINVAL;
1636 }
1637 }
1638
1639 return 0;
1640 }
1641
1642 static void ip6gre_netlink_parms(struct nlattr *data[],
1643 struct __ip6_tnl_parm *parms)
1644 {
1645 memset(parms, 0, sizeof(*parms));
1646
1647 if (!data)
1648 return;
1649
1650 if (data[IFLA_GRE_LINK])
1651 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1652
1653 if (data[IFLA_GRE_IFLAGS])
1654 parms->i_flags = gre_flags_to_tnl_flags(
1655 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1656
1657 if (data[IFLA_GRE_OFLAGS])
1658 parms->o_flags = gre_flags_to_tnl_flags(
1659 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1660
1661 if (data[IFLA_GRE_IKEY])
1662 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1663
1664 if (data[IFLA_GRE_OKEY])
1665 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1666
1667 if (data[IFLA_GRE_LOCAL])
1668 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1669
1670 if (data[IFLA_GRE_REMOTE])
1671 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1672
1673 if (data[IFLA_GRE_TTL])
1674 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1675
1676 if (data[IFLA_GRE_ENCAP_LIMIT])
1677 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1678
1679 if (data[IFLA_GRE_FLOWINFO])
1680 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1681
1682 if (data[IFLA_GRE_FLAGS])
1683 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1684
1685 if (data[IFLA_GRE_FWMARK])
1686 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1687
1688 if (data[IFLA_GRE_COLLECT_METADATA])
1689 parms->collect_md = true;
1690
1691 if (data[IFLA_GRE_ERSPAN_VER])
1692 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1693
1694 if (parms->erspan_ver == 1) {
1695 if (data[IFLA_GRE_ERSPAN_INDEX])
1696 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1697 } else if (parms->erspan_ver == 2) {
1698 if (data[IFLA_GRE_ERSPAN_DIR])
1699 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1700 if (data[IFLA_GRE_ERSPAN_HWID])
1701 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1702 }
1703 }
1704
1705 static int ip6gre_tap_init(struct net_device *dev)
1706 {
1707 int ret;
1708
1709 ret = ip6gre_tunnel_init_common(dev);
1710 if (ret)
1711 return ret;
1712
1713 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1714
1715 return 0;
1716 }
1717
1718 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1719 .ndo_init = ip6gre_tap_init,
1720 .ndo_uninit = ip6gre_tunnel_uninit,
1721 .ndo_start_xmit = ip6gre_tunnel_xmit,
1722 .ndo_set_mac_address = eth_mac_addr,
1723 .ndo_validate_addr = eth_validate_addr,
1724 .ndo_change_mtu = ip6_tnl_change_mtu,
1725 .ndo_get_stats64 = ip_tunnel_get_stats64,
1726 .ndo_get_iflink = ip6_tnl_get_iflink,
1727 };
1728
1729 static int ip6erspan_tap_init(struct net_device *dev)
1730 {
1731 struct ip6_tnl *tunnel;
1732 int t_hlen;
1733 int ret;
1734
1735 tunnel = netdev_priv(dev);
1736
1737 tunnel->dev = dev;
1738 tunnel->net = dev_net(dev);
1739 strcpy(tunnel->parms.name, dev->name);
1740
1741 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1742 if (!dev->tstats)
1743 return -ENOMEM;
1744
1745 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1746 if (ret) {
1747 free_percpu(dev->tstats);
1748 dev->tstats = NULL;
1749 return ret;
1750 }
1751
1752 tunnel->tun_hlen = 8;
1753 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1754 erspan_hdr_len(tunnel->parms.erspan_ver);
1755 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1756
1757 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1758 dev->mtu = ETH_DATA_LEN - t_hlen;
1759 if (dev->type == ARPHRD_ETHER)
1760 dev->mtu -= ETH_HLEN;
1761 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1762 dev->mtu -= 8;
1763
1764 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1765 tunnel = netdev_priv(dev);
1766 ip6gre_tnl_link_config(tunnel, 1);
1767
1768 return 0;
1769 }
1770
1771 static const struct net_device_ops ip6erspan_netdev_ops = {
1772 .ndo_init = ip6erspan_tap_init,
1773 .ndo_uninit = ip6gre_tunnel_uninit,
1774 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1775 .ndo_set_mac_address = eth_mac_addr,
1776 .ndo_validate_addr = eth_validate_addr,
1777 .ndo_change_mtu = ip6_tnl_change_mtu,
1778 .ndo_get_stats64 = ip_tunnel_get_stats64,
1779 .ndo_get_iflink = ip6_tnl_get_iflink,
1780 };
1781
1782 static void ip6gre_tap_setup(struct net_device *dev)
1783 {
1784
1785 ether_setup(dev);
1786
1787 dev->max_mtu = 0;
1788 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1789 dev->needs_free_netdev = true;
1790 dev->priv_destructor = ip6gre_dev_free;
1791
1792 dev->features |= NETIF_F_NETNS_LOCAL;
1793 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1794 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1795 netif_keep_dst(dev);
1796 }
1797
1798 bool is_ip6gretap_dev(const struct net_device *dev)
1799 {
1800 return dev->netdev_ops == &ip6gre_tap_netdev_ops;
1801 }
1802 EXPORT_SYMBOL_GPL(is_ip6gretap_dev);
1803
1804 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1805 struct ip_tunnel_encap *ipencap)
1806 {
1807 bool ret = false;
1808
1809 memset(ipencap, 0, sizeof(*ipencap));
1810
1811 if (!data)
1812 return ret;
1813
1814 if (data[IFLA_GRE_ENCAP_TYPE]) {
1815 ret = true;
1816 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1817 }
1818
1819 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1820 ret = true;
1821 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1822 }
1823
1824 if (data[IFLA_GRE_ENCAP_SPORT]) {
1825 ret = true;
1826 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1827 }
1828
1829 if (data[IFLA_GRE_ENCAP_DPORT]) {
1830 ret = true;
1831 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1832 }
1833
1834 return ret;
1835 }
1836
1837 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1838 struct nlattr *tb[], struct nlattr *data[],
1839 struct netlink_ext_ack *extack)
1840 {
1841 struct ip6_tnl *nt;
1842 struct net *net = dev_net(dev);
1843 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1844 struct ip_tunnel_encap ipencap;
1845 int err;
1846
1847 nt = netdev_priv(dev);
1848
1849 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1850 int err = ip6_tnl_encap_setup(nt, &ipencap);
1851
1852 if (err < 0)
1853 return err;
1854 }
1855
1856 ip6gre_netlink_parms(data, &nt->parms);
1857
1858 if (nt->parms.collect_md) {
1859 if (rtnl_dereference(ign->collect_md_tun))
1860 return -EEXIST;
1861 } else {
1862 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1863 return -EEXIST;
1864 }
1865
1866 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1867 eth_hw_addr_random(dev);
1868
1869 nt->dev = dev;
1870 nt->net = dev_net(dev);
1871
1872 err = register_netdevice(dev);
1873 if (err)
1874 goto out;
1875
1876 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1877
1878 if (tb[IFLA_MTU])
1879 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1880
1881 dev_hold(dev);
1882 ip6gre_tunnel_link(ign, nt);
1883
1884 out:
1885 return err;
1886 }
1887
1888 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1889 struct nlattr *data[],
1890 struct netlink_ext_ack *extack)
1891 {
1892 struct ip6_tnl *t, *nt = netdev_priv(dev);
1893 struct net *net = nt->net;
1894 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1895 struct __ip6_tnl_parm p;
1896 struct ip_tunnel_encap ipencap;
1897
1898 if (dev == ign->fb_tunnel_dev)
1899 return -EINVAL;
1900
1901 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1902 int err = ip6_tnl_encap_setup(nt, &ipencap);
1903
1904 if (err < 0)
1905 return err;
1906 }
1907
1908 ip6gre_netlink_parms(data, &p);
1909
1910 t = ip6gre_tunnel_locate(net, &p, 0);
1911
1912 if (t) {
1913 if (t->dev != dev)
1914 return -EEXIST;
1915 } else {
1916 t = nt;
1917 }
1918
1919 ip6gre_tunnel_unlink(ign, t);
1920 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1921 ip6gre_tunnel_link(ign, t);
1922 return 0;
1923 }
1924
1925 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
1926 {
1927 struct net *net = dev_net(dev);
1928 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1929
1930 if (dev != ign->fb_tunnel_dev)
1931 unregister_netdevice_queue(dev, head);
1932 }
1933
1934 static size_t ip6gre_get_size(const struct net_device *dev)
1935 {
1936 return
1937 /* IFLA_GRE_LINK */
1938 nla_total_size(4) +
1939 /* IFLA_GRE_IFLAGS */
1940 nla_total_size(2) +
1941 /* IFLA_GRE_OFLAGS */
1942 nla_total_size(2) +
1943 /* IFLA_GRE_IKEY */
1944 nla_total_size(4) +
1945 /* IFLA_GRE_OKEY */
1946 nla_total_size(4) +
1947 /* IFLA_GRE_LOCAL */
1948 nla_total_size(sizeof(struct in6_addr)) +
1949 /* IFLA_GRE_REMOTE */
1950 nla_total_size(sizeof(struct in6_addr)) +
1951 /* IFLA_GRE_TTL */
1952 nla_total_size(1) +
1953 /* IFLA_GRE_ENCAP_LIMIT */
1954 nla_total_size(1) +
1955 /* IFLA_GRE_FLOWINFO */
1956 nla_total_size(4) +
1957 /* IFLA_GRE_FLAGS */
1958 nla_total_size(4) +
1959 /* IFLA_GRE_ENCAP_TYPE */
1960 nla_total_size(2) +
1961 /* IFLA_GRE_ENCAP_FLAGS */
1962 nla_total_size(2) +
1963 /* IFLA_GRE_ENCAP_SPORT */
1964 nla_total_size(2) +
1965 /* IFLA_GRE_ENCAP_DPORT */
1966 nla_total_size(2) +
1967 /* IFLA_GRE_COLLECT_METADATA */
1968 nla_total_size(0) +
1969 /* IFLA_GRE_FWMARK */
1970 nla_total_size(4) +
1971 /* IFLA_GRE_ERSPAN_INDEX */
1972 nla_total_size(4) +
1973 0;
1974 }
1975
1976 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1977 {
1978 struct ip6_tnl *t = netdev_priv(dev);
1979 struct __ip6_tnl_parm *p = &t->parms;
1980
1981 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1982 nla_put_be16(skb, IFLA_GRE_IFLAGS,
1983 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
1984 nla_put_be16(skb, IFLA_GRE_OFLAGS,
1985 gre_tnl_flags_to_gre_flags(p->o_flags)) ||
1986 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1987 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
1988 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
1989 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
1990 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1991 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1992 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1993 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
1994 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark) ||
1995 nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
1996 goto nla_put_failure;
1997
1998 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
1999 t->encap.type) ||
2000 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2001 t->encap.sport) ||
2002 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2003 t->encap.dport) ||
2004 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2005 t->encap.flags))
2006 goto nla_put_failure;
2007
2008 if (p->collect_md) {
2009 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2010 goto nla_put_failure;
2011 }
2012
2013 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2014 goto nla_put_failure;
2015
2016 if (p->erspan_ver == 1) {
2017 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2018 goto nla_put_failure;
2019 } else if (p->erspan_ver == 2) {
2020 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2021 goto nla_put_failure;
2022 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2023 goto nla_put_failure;
2024 }
2025
2026 return 0;
2027
2028 nla_put_failure:
2029 return -EMSGSIZE;
2030 }
2031
2032 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2033 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2034 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2035 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2036 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2037 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2038 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
2039 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
2040 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2041 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2042 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2043 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
2044 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2045 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2046 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2047 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
2048 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2049 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
2050 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2051 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2052 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2053 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
2054 };
2055
2056 static void ip6erspan_tap_setup(struct net_device *dev)
2057 {
2058 ether_setup(dev);
2059
2060 dev->netdev_ops = &ip6erspan_netdev_ops;
2061 dev->needs_free_netdev = true;
2062 dev->priv_destructor = ip6gre_dev_free;
2063
2064 dev->features |= NETIF_F_NETNS_LOCAL;
2065 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2066 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2067 netif_keep_dst(dev);
2068 }
2069
2070 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2071 .kind = "ip6gre",
2072 .maxtype = IFLA_GRE_MAX,
2073 .policy = ip6gre_policy,
2074 .priv_size = sizeof(struct ip6_tnl),
2075 .setup = ip6gre_tunnel_setup,
2076 .validate = ip6gre_tunnel_validate,
2077 .newlink = ip6gre_newlink,
2078 .changelink = ip6gre_changelink,
2079 .dellink = ip6gre_dellink,
2080 .get_size = ip6gre_get_size,
2081 .fill_info = ip6gre_fill_info,
2082 .get_link_net = ip6_tnl_get_link_net,
2083 };
2084
2085 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2086 .kind = "ip6gretap",
2087 .maxtype = IFLA_GRE_MAX,
2088 .policy = ip6gre_policy,
2089 .priv_size = sizeof(struct ip6_tnl),
2090 .setup = ip6gre_tap_setup,
2091 .validate = ip6gre_tap_validate,
2092 .newlink = ip6gre_newlink,
2093 .changelink = ip6gre_changelink,
2094 .get_size = ip6gre_get_size,
2095 .fill_info = ip6gre_fill_info,
2096 .get_link_net = ip6_tnl_get_link_net,
2097 };
2098
2099 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2100 .kind = "ip6erspan",
2101 .maxtype = IFLA_GRE_MAX,
2102 .policy = ip6gre_policy,
2103 .priv_size = sizeof(struct ip6_tnl),
2104 .setup = ip6erspan_tap_setup,
2105 .validate = ip6erspan_tap_validate,
2106 .newlink = ip6gre_newlink,
2107 .changelink = ip6gre_changelink,
2108 .get_size = ip6gre_get_size,
2109 .fill_info = ip6gre_fill_info,
2110 .get_link_net = ip6_tnl_get_link_net,
2111 };
2112
2113 /*
2114 * And now the modules code and kernel interface.
2115 */
2116
2117 static int __init ip6gre_init(void)
2118 {
2119 int err;
2120
2121 pr_info("GRE over IPv6 tunneling driver\n");
2122
2123 err = register_pernet_device(&ip6gre_net_ops);
2124 if (err < 0)
2125 return err;
2126
2127 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2128 if (err < 0) {
2129 pr_info("%s: can't add protocol\n", __func__);
2130 goto add_proto_failed;
2131 }
2132
2133 err = rtnl_link_register(&ip6gre_link_ops);
2134 if (err < 0)
2135 goto rtnl_link_failed;
2136
2137 err = rtnl_link_register(&ip6gre_tap_ops);
2138 if (err < 0)
2139 goto tap_ops_failed;
2140
2141 err = rtnl_link_register(&ip6erspan_tap_ops);
2142 if (err < 0)
2143 goto erspan_link_failed;
2144
2145 out:
2146 return err;
2147
2148 erspan_link_failed:
2149 rtnl_link_unregister(&ip6gre_tap_ops);
2150 tap_ops_failed:
2151 rtnl_link_unregister(&ip6gre_link_ops);
2152 rtnl_link_failed:
2153 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2154 add_proto_failed:
2155 unregister_pernet_device(&ip6gre_net_ops);
2156 goto out;
2157 }
2158
2159 static void __exit ip6gre_fini(void)
2160 {
2161 rtnl_link_unregister(&ip6gre_tap_ops);
2162 rtnl_link_unregister(&ip6gre_link_ops);
2163 rtnl_link_unregister(&ip6erspan_tap_ops);
2164 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2165 unregister_pernet_device(&ip6gre_net_ops);
2166 }
2167
2168 module_init(ip6gre_init);
2169 module_exit(ip6gre_fini);
2170 MODULE_LICENSE("GPL");
2171 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2172 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2173 MODULE_ALIAS_RTNL_LINK("ip6gre");
2174 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2175 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2176 MODULE_ALIAS_NETDEV("ip6gre0");
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