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xfs: add full xfs_dqblk verifier
[linux/fpc-iii.git] / net / ipv6 / ip6_gre.c
blob69727bc168cb027009dac95431e40b71291697da
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 if (!dev_valid_name(parms->name))
340 return NULL;
341 strlcpy(name, parms->name, IFNAMSIZ);
342 } else {
343 strcpy(name, "ip6gre%d");
344 }
345 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
346 ip6gre_tunnel_setup);
347 if (!dev)
348 return NULL;
349
350 dev_net_set(dev, net);
351
352 nt = netdev_priv(dev);
353 nt->parms = *parms;
354 dev->rtnl_link_ops = &ip6gre_link_ops;
355
356 nt->dev = dev;
357 nt->net = dev_net(dev);
358
359 if (register_netdevice(dev) < 0)
360 goto failed_free;
361
362 ip6gre_tnl_link_config(nt, 1);
363
364 /* Can use a lockless transmit, unless we generate output sequences */
365 if (!(nt->parms.o_flags & TUNNEL_SEQ))
366 dev->features |= NETIF_F_LLTX;
367
368 dev_hold(dev);
369 ip6gre_tunnel_link(ign, nt);
370 return nt;
371
372 failed_free:
373 free_netdev(dev);
374 return NULL;
375 }
376
377 static void ip6gre_tunnel_uninit(struct net_device *dev)
378 {
379 struct ip6_tnl *t = netdev_priv(dev);
380 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
381
382 ip6gre_tunnel_unlink(ign, t);
383 dst_cache_reset(&t->dst_cache);
384 dev_put(dev);
385 }
386
387
388 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
389 u8 type, u8 code, int offset, __be32 info)
390 {
391 struct net *net = dev_net(skb->dev);
392 const struct gre_base_hdr *greh;
393 const struct ipv6hdr *ipv6h;
394 int grehlen = sizeof(*greh);
395 struct ip6_tnl *t;
396 int key_off = 0;
397 __be16 flags;
398 __be32 key;
399
400 if (!pskb_may_pull(skb, offset + grehlen))
401 return;
402 greh = (const struct gre_base_hdr *)(skb->data + offset);
403 flags = greh->flags;
404 if (flags & (GRE_VERSION | GRE_ROUTING))
405 return;
406 if (flags & GRE_CSUM)
407 grehlen += 4;
408 if (flags & GRE_KEY) {
409 key_off = grehlen + offset;
410 grehlen += 4;
411 }
412
413 if (!pskb_may_pull(skb, offset + grehlen))
414 return;
415 ipv6h = (const struct ipv6hdr *)skb->data;
416 greh = (const struct gre_base_hdr *)(skb->data + offset);
417 key = key_off ? *(__be32 *)(skb->data + key_off) : 0;
418
419 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
420 key, greh->protocol);
421 if (!t)
422 return;
423
424 switch (type) {
425 struct ipv6_tlv_tnl_enc_lim *tel;
426 __u32 teli;
427 case ICMPV6_DEST_UNREACH:
428 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
429 t->parms.name);
430 if (code != ICMPV6_PORT_UNREACH)
431 break;
432 return;
433 case ICMPV6_TIME_EXCEED:
434 if (code == ICMPV6_EXC_HOPLIMIT) {
435 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
436 t->parms.name);
437 break;
438 }
439 return;
440 case ICMPV6_PARAMPROB:
441 teli = 0;
442 if (code == ICMPV6_HDR_FIELD)
443 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
444
445 if (teli && teli == be32_to_cpu(info) - 2) {
446 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
447 if (tel->encap_limit == 0) {
448 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
449 t->parms.name);
450 }
451 } else {
452 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
453 t->parms.name);
454 }
455 return;
456 case ICMPV6_PKT_TOOBIG:
457 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
458 return;
459 case NDISC_REDIRECT:
460 ip6_redirect(skb, net, skb->dev->ifindex, 0,
461 sock_net_uid(net, NULL));
462 return;
463 }
464
465 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
466 t->err_count++;
467 else
468 t->err_count = 1;
469 t->err_time = jiffies;
470 }
471
472 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
473 {
474 const struct ipv6hdr *ipv6h;
475 struct ip6_tnl *tunnel;
476
477 ipv6h = ipv6_hdr(skb);
478 tunnel = ip6gre_tunnel_lookup(skb->dev,
479 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
480 tpi->proto);
481 if (tunnel) {
482 if (tunnel->parms.collect_md) {
483 struct metadata_dst *tun_dst;
484 __be64 tun_id;
485 __be16 flags;
486
487 flags = tpi->flags;
488 tun_id = key32_to_tunnel_id(tpi->key);
489
490 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
491 if (!tun_dst)
492 return PACKET_REJECT;
493
494 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
495 } else {
496 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
497 }
498
499 return PACKET_RCVD;
500 }
501
502 return PACKET_REJECT;
503 }
504
505 static int ip6erspan_rcv(struct sk_buff *skb, int gre_hdr_len,
506 struct tnl_ptk_info *tpi)
507 {
508 struct erspan_base_hdr *ershdr;
509 struct erspan_metadata *pkt_md;
510 const struct ipv6hdr *ipv6h;
511 struct erspan_md2 *md2;
512 struct ip6_tnl *tunnel;
513 u8 ver;
514
515 if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr))))
516 return PACKET_REJECT;
517
518 ipv6h = ipv6_hdr(skb);
519 ershdr = (struct erspan_base_hdr *)skb->data;
520 ver = ershdr->ver;
521 tpi->key = cpu_to_be32(get_session_id(ershdr));
522
523 tunnel = ip6gre_tunnel_lookup(skb->dev,
524 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
525 tpi->proto);
526 if (tunnel) {
527 int len = erspan_hdr_len(ver);
528
529 if (unlikely(!pskb_may_pull(skb, len)))
530 return PACKET_REJECT;
531
532 ershdr = (struct erspan_base_hdr *)skb->data;
533 pkt_md = (struct erspan_metadata *)(ershdr + 1);
534
535 if (__iptunnel_pull_header(skb, len,
536 htons(ETH_P_TEB),
537 false, false) < 0)
538 return PACKET_REJECT;
539
540 if (tunnel->parms.collect_md) {
541 struct metadata_dst *tun_dst;
542 struct ip_tunnel_info *info;
543 struct erspan_metadata *md;
544 __be64 tun_id;
545 __be16 flags;
546
547 tpi->flags |= TUNNEL_KEY;
548 flags = tpi->flags;
549 tun_id = key32_to_tunnel_id(tpi->key);
550
551 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
552 sizeof(*md));
553 if (!tun_dst)
554 return PACKET_REJECT;
555
556 info = &tun_dst->u.tun_info;
557 md = ip_tunnel_info_opts(info);
558 md->version = ver;
559 md2 = &md->u.md2;
560 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
561 ERSPAN_V2_MDSIZE);
562 info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
563 info->options_len = sizeof(*md);
564
565 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
566
567 } else {
568 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
569 }
570
571 return PACKET_RCVD;
572 }
573
574 return PACKET_REJECT;
575 }
576
577 static int gre_rcv(struct sk_buff *skb)
578 {
579 struct tnl_ptk_info tpi;
580 bool csum_err = false;
581 int hdr_len;
582
583 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
584 if (hdr_len < 0)
585 goto drop;
586
587 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
588 goto drop;
589
590 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
591 tpi.proto == htons(ETH_P_ERSPAN2))) {
592 if (ip6erspan_rcv(skb, hdr_len, &tpi) == PACKET_RCVD)
593 return 0;
594 goto out;
595 }
596
597 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
598 return 0;
599
600 out:
601 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
602 drop:
603 kfree_skb(skb);
604 return 0;
605 }
606
607 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
608 {
609 return iptunnel_handle_offloads(skb,
610 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
611 }
612
613 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
614 struct net_device *dev,
615 struct flowi6 *fl6, __u8 *dsfield,
616 int *encap_limit)
617 {
618 const struct iphdr *iph = ip_hdr(skb);
619 struct ip6_tnl *t = netdev_priv(dev);
620
621 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
622 *encap_limit = t->parms.encap_limit;
623
624 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
625
626 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
627 *dsfield = ipv4_get_dsfield(iph);
628 else
629 *dsfield = ip6_tclass(t->parms.flowinfo);
630
631 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
632 fl6->flowi6_mark = skb->mark;
633 else
634 fl6->flowi6_mark = t->parms.fwmark;
635
636 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
637 }
638
639 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
640 struct net_device *dev,
641 struct flowi6 *fl6, __u8 *dsfield,
642 int *encap_limit)
643 {
644 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
645 struct ip6_tnl *t = netdev_priv(dev);
646 __u16 offset;
647
648 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
649 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
650
651 if (offset > 0) {
652 struct ipv6_tlv_tnl_enc_lim *tel;
653
654 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
655 if (tel->encap_limit == 0) {
656 icmpv6_send(skb, ICMPV6_PARAMPROB,
657 ICMPV6_HDR_FIELD, offset + 2);
658 return -1;
659 }
660 *encap_limit = tel->encap_limit - 1;
661 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
662 *encap_limit = t->parms.encap_limit;
663 }
664
665 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
666
667 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
668 *dsfield = ipv6_get_dsfield(ipv6h);
669 else
670 *dsfield = ip6_tclass(t->parms.flowinfo);
671
672 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
673 fl6->flowlabel |= ip6_flowlabel(ipv6h);
674
675 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
676 fl6->flowi6_mark = skb->mark;
677 else
678 fl6->flowi6_mark = t->parms.fwmark;
679
680 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
681
682 return 0;
683 }
684
685 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
686 struct net_device *dev, __u8 dsfield,
687 struct flowi6 *fl6, int encap_limit,
688 __u32 *pmtu, __be16 proto)
689 {
690 struct ip6_tnl *tunnel = netdev_priv(dev);
691 __be16 protocol;
692
693 if (dev->type == ARPHRD_ETHER)
694 IPCB(skb)->flags = 0;
695
696 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
697 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
698 else
699 fl6->daddr = tunnel->parms.raddr;
700
701 /* Push GRE header. */
702 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
703
704 if (tunnel->parms.collect_md) {
705 struct ip_tunnel_info *tun_info;
706 const struct ip_tunnel_key *key;
707 __be16 flags;
708
709 tun_info = skb_tunnel_info(skb);
710 if (unlikely(!tun_info ||
711 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
712 ip_tunnel_info_af(tun_info) != AF_INET6))
713 return -EINVAL;
714
715 key = &tun_info->key;
716 memset(fl6, 0, sizeof(*fl6));
717 fl6->flowi6_proto = IPPROTO_GRE;
718 fl6->daddr = key->u.ipv6.dst;
719 fl6->flowlabel = key->label;
720 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
721
722 dsfield = key->tos;
723 flags = key->tun_flags &
724 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
725 tunnel->tun_hlen = gre_calc_hlen(flags);
726
727 gre_build_header(skb, tunnel->tun_hlen,
728 flags, protocol,
729 tunnel_id_to_key32(tun_info->key.tun_id),
730 (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++)
731 : 0);
732
733 } else {
734 if (tunnel->parms.o_flags & TUNNEL_SEQ)
735 tunnel->o_seqno++;
736
737 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
738 protocol, tunnel->parms.o_key,
739 htonl(tunnel->o_seqno));
740 }
741
742 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
743 NEXTHDR_GRE);
744 }
745
746 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
747 {
748 struct ip6_tnl *t = netdev_priv(dev);
749 int encap_limit = -1;
750 struct flowi6 fl6;
751 __u8 dsfield = 0;
752 __u32 mtu;
753 int err;
754
755 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
756
757 if (!t->parms.collect_md)
758 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
759 &dsfield, &encap_limit);
760
761 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
762 if (err)
763 return -1;
764
765 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
766 skb->protocol);
767 if (err != 0) {
768 /* XXX: send ICMP error even if DF is not set. */
769 if (err == -EMSGSIZE)
770 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
771 htonl(mtu));
772 return -1;
773 }
774
775 return 0;
776 }
777
778 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
779 {
780 struct ip6_tnl *t = netdev_priv(dev);
781 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
782 int encap_limit = -1;
783 struct flowi6 fl6;
784 __u8 dsfield = 0;
785 __u32 mtu;
786 int err;
787
788 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
789 return -1;
790
791 if (!t->parms.collect_md &&
792 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
793 return -1;
794
795 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
796 return -1;
797
798 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
799 &mtu, skb->protocol);
800 if (err != 0) {
801 if (err == -EMSGSIZE)
802 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
803 return -1;
804 }
805
806 return 0;
807 }
808
809 /**
810 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
811 * @t: the outgoing tunnel device
812 * @hdr: IPv6 header from the incoming packet
813 *
814 * Description:
815 * Avoid trivial tunneling loop by checking that tunnel exit-point
816 * doesn't match source of incoming packet.
817 *
818 * Return:
819 * 1 if conflict,
820 * 0 else
821 **/
822
823 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
824 const struct ipv6hdr *hdr)
825 {
826 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
827 }
828
829 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
830 {
831 struct ip6_tnl *t = netdev_priv(dev);
832 int encap_limit = -1;
833 struct flowi6 fl6;
834 __u32 mtu;
835 int err;
836
837 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
838 encap_limit = t->parms.encap_limit;
839
840 if (!t->parms.collect_md)
841 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
842
843 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
844 if (err)
845 return err;
846
847 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
848
849 return err;
850 }
851
852 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
853 struct net_device *dev)
854 {
855 struct ip6_tnl *t = netdev_priv(dev);
856 struct net_device_stats *stats = &t->dev->stats;
857 int ret;
858
859 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
860 goto tx_err;
861
862 switch (skb->protocol) {
863 case htons(ETH_P_IP):
864 ret = ip6gre_xmit_ipv4(skb, dev);
865 break;
866 case htons(ETH_P_IPV6):
867 ret = ip6gre_xmit_ipv6(skb, dev);
868 break;
869 default:
870 ret = ip6gre_xmit_other(skb, dev);
871 break;
872 }
873
874 if (ret < 0)
875 goto tx_err;
876
877 return NETDEV_TX_OK;
878
879 tx_err:
880 stats->tx_errors++;
881 stats->tx_dropped++;
882 kfree_skb(skb);
883 return NETDEV_TX_OK;
884 }
885
886 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
887 struct net_device *dev)
888 {
889 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
890 struct ip6_tnl *t = netdev_priv(dev);
891 struct dst_entry *dst = skb_dst(skb);
892 struct net_device_stats *stats;
893 bool truncate = false;
894 int encap_limit = -1;
895 __u8 dsfield = false;
896 struct flowi6 fl6;
897 int err = -EINVAL;
898 __u32 mtu;
899
900 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
901 goto tx_err;
902
903 if (gre_handle_offloads(skb, false))
904 goto tx_err;
905
906 if (skb->len > dev->mtu + dev->hard_header_len) {
907 pskb_trim(skb, dev->mtu + dev->hard_header_len);
908 truncate = true;
909 }
910
911 if (skb_cow_head(skb, dev->needed_headroom))
912 goto tx_err;
913
914 t->parms.o_flags &= ~TUNNEL_KEY;
915 IPCB(skb)->flags = 0;
916
917 /* For collect_md mode, derive fl6 from the tunnel key,
918 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
919 */
920 if (t->parms.collect_md) {
921 struct ip_tunnel_info *tun_info;
922 const struct ip_tunnel_key *key;
923 struct erspan_metadata *md;
924 __be32 tun_id;
925
926 tun_info = skb_tunnel_info(skb);
927 if (unlikely(!tun_info ||
928 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
929 ip_tunnel_info_af(tun_info) != AF_INET6))
930 return -EINVAL;
931
932 key = &tun_info->key;
933 memset(&fl6, 0, sizeof(fl6));
934 fl6.flowi6_proto = IPPROTO_GRE;
935 fl6.daddr = key->u.ipv6.dst;
936 fl6.flowlabel = key->label;
937 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
938
939 dsfield = key->tos;
940 md = ip_tunnel_info_opts(tun_info);
941 if (!md)
942 goto tx_err;
943
944 tun_id = tunnel_id_to_key32(key->tun_id);
945 if (md->version == 1) {
946 erspan_build_header(skb,
947 ntohl(tun_id),
948 ntohl(md->u.index), truncate,
949 false);
950 } else if (md->version == 2) {
951 erspan_build_header_v2(skb,
952 ntohl(tun_id),
953 md->u.md2.dir,
954 get_hwid(&md->u.md2),
955 truncate, false);
956 } else {
957 goto tx_err;
958 }
959 } else {
960 switch (skb->protocol) {
961 case htons(ETH_P_IP):
962 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
963 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
964 &dsfield, &encap_limit);
965 break;
966 case htons(ETH_P_IPV6):
967 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
968 goto tx_err;
969 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
970 &dsfield, &encap_limit))
971 goto tx_err;
972 break;
973 default:
974 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
975 break;
976 }
977
978 if (t->parms.erspan_ver == 1)
979 erspan_build_header(skb, ntohl(t->parms.o_key),
980 t->parms.index,
981 truncate, false);
982 else
983 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
984 t->parms.dir,
985 t->parms.hwid,
986 truncate, false);
987 fl6.daddr = t->parms.raddr;
988 }
989
990 /* Push GRE header. */
991 gre_build_header(skb, 8, TUNNEL_SEQ,
992 htons(ETH_P_ERSPAN), 0, htonl(t->o_seqno++));
993
994 /* TooBig packet may have updated dst->dev's mtu */
995 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
996 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu);
997
998 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
999 NEXTHDR_GRE);
1000 if (err != 0) {
1001 /* XXX: send ICMP error even if DF is not set. */
1002 if (err == -EMSGSIZE) {
1003 if (skb->protocol == htons(ETH_P_IP))
1004 icmp_send(skb, ICMP_DEST_UNREACH,
1005 ICMP_FRAG_NEEDED, htonl(mtu));
1006 else
1007 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1008 }
1009
1010 goto tx_err;
1011 }
1012 return NETDEV_TX_OK;
1013
1014 tx_err:
1015 stats = &t->dev->stats;
1016 stats->tx_errors++;
1017 stats->tx_dropped++;
1018 kfree_skb(skb);
1019 return NETDEV_TX_OK;
1020 }
1021
1022 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1023 {
1024 struct net_device *dev = t->dev;
1025 struct __ip6_tnl_parm *p = &t->parms;
1026 struct flowi6 *fl6 = &t->fl.u.ip6;
1027 int t_hlen;
1028
1029 if (dev->type != ARPHRD_ETHER) {
1030 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1031 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1032 }
1033
1034 /* Set up flowi template */
1035 fl6->saddr = p->laddr;
1036 fl6->daddr = p->raddr;
1037 fl6->flowi6_oif = p->link;
1038 fl6->flowlabel = 0;
1039 fl6->flowi6_proto = IPPROTO_GRE;
1040
1041 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1042 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1043 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1044 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1045
1046 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1047 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1048
1049 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1050 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1051 dev->flags |= IFF_POINTOPOINT;
1052 else
1053 dev->flags &= ~IFF_POINTOPOINT;
1054
1055 t->tun_hlen = gre_calc_hlen(t->parms.o_flags);
1056
1057 t->hlen = t->encap_hlen + t->tun_hlen;
1058
1059 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1060
1061 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1062 int strict = (ipv6_addr_type(&p->raddr) &
1063 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1064
1065 struct rt6_info *rt = rt6_lookup(t->net,
1066 &p->raddr, &p->laddr,
1067 p->link, NULL, strict);
1068
1069 if (!rt)
1070 return;
1071
1072 if (rt->dst.dev) {
1073 dev->hard_header_len = rt->dst.dev->hard_header_len +
1074 t_hlen;
1075
1076 if (set_mtu) {
1077 dev->mtu = rt->dst.dev->mtu - t_hlen;
1078 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1079 dev->mtu -= 8;
1080 if (dev->type == ARPHRD_ETHER)
1081 dev->mtu -= ETH_HLEN;
1082
1083 if (dev->mtu < IPV6_MIN_MTU)
1084 dev->mtu = IPV6_MIN_MTU;
1085 }
1086 }
1087 ip6_rt_put(rt);
1088 }
1089 }
1090
1091 static int ip6gre_tnl_change(struct ip6_tnl *t,
1092 const struct __ip6_tnl_parm *p, int set_mtu)
1093 {
1094 t->parms.laddr = p->laddr;
1095 t->parms.raddr = p->raddr;
1096 t->parms.flags = p->flags;
1097 t->parms.hop_limit = p->hop_limit;
1098 t->parms.encap_limit = p->encap_limit;
1099 t->parms.flowinfo = p->flowinfo;
1100 t->parms.link = p->link;
1101 t->parms.proto = p->proto;
1102 t->parms.i_key = p->i_key;
1103 t->parms.o_key = p->o_key;
1104 t->parms.i_flags = p->i_flags;
1105 t->parms.o_flags = p->o_flags;
1106 t->parms.fwmark = p->fwmark;
1107 dst_cache_reset(&t->dst_cache);
1108 ip6gre_tnl_link_config(t, set_mtu);
1109 return 0;
1110 }
1111
1112 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1113 const struct ip6_tnl_parm2 *u)
1114 {
1115 p->laddr = u->laddr;
1116 p->raddr = u->raddr;
1117 p->flags = u->flags;
1118 p->hop_limit = u->hop_limit;
1119 p->encap_limit = u->encap_limit;
1120 p->flowinfo = u->flowinfo;
1121 p->link = u->link;
1122 p->i_key = u->i_key;
1123 p->o_key = u->o_key;
1124 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1125 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1126 memcpy(p->name, u->name, sizeof(u->name));
1127 }
1128
1129 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1130 const struct __ip6_tnl_parm *p)
1131 {
1132 u->proto = IPPROTO_GRE;
1133 u->laddr = p->laddr;
1134 u->raddr = p->raddr;
1135 u->flags = p->flags;
1136 u->hop_limit = p->hop_limit;
1137 u->encap_limit = p->encap_limit;
1138 u->flowinfo = p->flowinfo;
1139 u->link = p->link;
1140 u->i_key = p->i_key;
1141 u->o_key = p->o_key;
1142 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1143 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1144 memcpy(u->name, p->name, sizeof(u->name));
1145 }
1146
1147 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1148 struct ifreq *ifr, int cmd)
1149 {
1150 int err = 0;
1151 struct ip6_tnl_parm2 p;
1152 struct __ip6_tnl_parm p1;
1153 struct ip6_tnl *t = netdev_priv(dev);
1154 struct net *net = t->net;
1155 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1156
1157 memset(&p1, 0, sizeof(p1));
1158
1159 switch (cmd) {
1160 case SIOCGETTUNNEL:
1161 if (dev == ign->fb_tunnel_dev) {
1162 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1163 err = -EFAULT;
1164 break;
1165 }
1166 ip6gre_tnl_parm_from_user(&p1, &p);
1167 t = ip6gre_tunnel_locate(net, &p1, 0);
1168 if (!t)
1169 t = netdev_priv(dev);
1170 }
1171 memset(&p, 0, sizeof(p));
1172 ip6gre_tnl_parm_to_user(&p, &t->parms);
1173 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1174 err = -EFAULT;
1175 break;
1176
1177 case SIOCADDTUNNEL:
1178 case SIOCCHGTUNNEL:
1179 err = -EPERM;
1180 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1181 goto done;
1182
1183 err = -EFAULT;
1184 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1185 goto done;
1186
1187 err = -EINVAL;
1188 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1189 goto done;
1190
1191 if (!(p.i_flags&GRE_KEY))
1192 p.i_key = 0;
1193 if (!(p.o_flags&GRE_KEY))
1194 p.o_key = 0;
1195
1196 ip6gre_tnl_parm_from_user(&p1, &p);
1197 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1198
1199 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1200 if (t) {
1201 if (t->dev != dev) {
1202 err = -EEXIST;
1203 break;
1204 }
1205 } else {
1206 t = netdev_priv(dev);
1207
1208 ip6gre_tunnel_unlink(ign, t);
1209 synchronize_net();
1210 ip6gre_tnl_change(t, &p1, 1);
1211 ip6gre_tunnel_link(ign, t);
1212 netdev_state_change(dev);
1213 }
1214 }
1215
1216 if (t) {
1217 err = 0;
1218
1219 memset(&p, 0, sizeof(p));
1220 ip6gre_tnl_parm_to_user(&p, &t->parms);
1221 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1222 err = -EFAULT;
1223 } else
1224 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1225 break;
1226
1227 case SIOCDELTUNNEL:
1228 err = -EPERM;
1229 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1230 goto done;
1231
1232 if (dev == ign->fb_tunnel_dev) {
1233 err = -EFAULT;
1234 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1235 goto done;
1236 err = -ENOENT;
1237 ip6gre_tnl_parm_from_user(&p1, &p);
1238 t = ip6gre_tunnel_locate(net, &p1, 0);
1239 if (!t)
1240 goto done;
1241 err = -EPERM;
1242 if (t == netdev_priv(ign->fb_tunnel_dev))
1243 goto done;
1244 dev = t->dev;
1245 }
1246 unregister_netdevice(dev);
1247 err = 0;
1248 break;
1249
1250 default:
1251 err = -EINVAL;
1252 }
1253
1254 done:
1255 return err;
1256 }
1257
1258 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1259 unsigned short type, const void *daddr,
1260 const void *saddr, unsigned int len)
1261 {
1262 struct ip6_tnl *t = netdev_priv(dev);
1263 struct ipv6hdr *ipv6h;
1264 __be16 *p;
1265
1266 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1267 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1268 t->fl.u.ip6.flowlabel,
1269 true, &t->fl.u.ip6));
1270 ipv6h->hop_limit = t->parms.hop_limit;
1271 ipv6h->nexthdr = NEXTHDR_GRE;
1272 ipv6h->saddr = t->parms.laddr;
1273 ipv6h->daddr = t->parms.raddr;
1274
1275 p = (__be16 *)(ipv6h + 1);
1276 p[0] = t->parms.o_flags;
1277 p[1] = htons(type);
1278
1279 /*
1280 * Set the source hardware address.
1281 */
1282
1283 if (saddr)
1284 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1285 if (daddr)
1286 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1287 if (!ipv6_addr_any(&ipv6h->daddr))
1288 return t->hlen;
1289
1290 return -t->hlen;
1291 }
1292
1293 static const struct header_ops ip6gre_header_ops = {
1294 .create = ip6gre_header,
1295 };
1296
1297 static const struct net_device_ops ip6gre_netdev_ops = {
1298 .ndo_init = ip6gre_tunnel_init,
1299 .ndo_uninit = ip6gre_tunnel_uninit,
1300 .ndo_start_xmit = ip6gre_tunnel_xmit,
1301 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1302 .ndo_change_mtu = ip6_tnl_change_mtu,
1303 .ndo_get_stats64 = ip_tunnel_get_stats64,
1304 .ndo_get_iflink = ip6_tnl_get_iflink,
1305 };
1306
1307 static void ip6gre_dev_free(struct net_device *dev)
1308 {
1309 struct ip6_tnl *t = netdev_priv(dev);
1310
1311 dst_cache_destroy(&t->dst_cache);
1312 free_percpu(dev->tstats);
1313 }
1314
1315 static void ip6gre_tunnel_setup(struct net_device *dev)
1316 {
1317 dev->netdev_ops = &ip6gre_netdev_ops;
1318 dev->needs_free_netdev = true;
1319 dev->priv_destructor = ip6gre_dev_free;
1320
1321 dev->type = ARPHRD_IP6GRE;
1322
1323 dev->flags |= IFF_NOARP;
1324 dev->addr_len = sizeof(struct in6_addr);
1325 netif_keep_dst(dev);
1326 /* This perm addr will be used as interface identifier by IPv6 */
1327 dev->addr_assign_type = NET_ADDR_RANDOM;
1328 eth_random_addr(dev->perm_addr);
1329 }
1330
1331 #define GRE6_FEATURES (NETIF_F_SG | \
1332 NETIF_F_FRAGLIST | \
1333 NETIF_F_HIGHDMA | \
1334 NETIF_F_HW_CSUM)
1335
1336 static void ip6gre_tnl_init_features(struct net_device *dev)
1337 {
1338 struct ip6_tnl *nt = netdev_priv(dev);
1339
1340 dev->features |= GRE6_FEATURES;
1341 dev->hw_features |= GRE6_FEATURES;
1342
1343 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1344 /* TCP offload with GRE SEQ is not supported, nor
1345 * can we support 2 levels of outer headers requiring
1346 * an update.
1347 */
1348 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1349 nt->encap.type == TUNNEL_ENCAP_NONE) {
1350 dev->features |= NETIF_F_GSO_SOFTWARE;
1351 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1352 }
1353
1354 /* Can use a lockless transmit, unless we generate
1355 * output sequences
1356 */
1357 dev->features |= NETIF_F_LLTX;
1358 }
1359 }
1360
1361 static int ip6gre_tunnel_init_common(struct net_device *dev)
1362 {
1363 struct ip6_tnl *tunnel;
1364 int ret;
1365 int t_hlen;
1366
1367 tunnel = netdev_priv(dev);
1368
1369 tunnel->dev = dev;
1370 tunnel->net = dev_net(dev);
1371 strcpy(tunnel->parms.name, dev->name);
1372
1373 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1374 if (!dev->tstats)
1375 return -ENOMEM;
1376
1377 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1378 if (ret) {
1379 free_percpu(dev->tstats);
1380 dev->tstats = NULL;
1381 return ret;
1382 }
1383
1384 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1385 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1386 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1387
1388 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1389 dev->mtu = ETH_DATA_LEN - t_hlen;
1390 if (dev->type == ARPHRD_ETHER)
1391 dev->mtu -= ETH_HLEN;
1392 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1393 dev->mtu -= 8;
1394
1395 if (tunnel->parms.collect_md) {
1396 dev->features |= NETIF_F_NETNS_LOCAL;
1397 netif_keep_dst(dev);
1398 }
1399 ip6gre_tnl_init_features(dev);
1400
1401 return 0;
1402 }
1403
1404 static int ip6gre_tunnel_init(struct net_device *dev)
1405 {
1406 struct ip6_tnl *tunnel;
1407 int ret;
1408
1409 ret = ip6gre_tunnel_init_common(dev);
1410 if (ret)
1411 return ret;
1412
1413 tunnel = netdev_priv(dev);
1414
1415 if (tunnel->parms.collect_md)
1416 return 0;
1417
1418 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1419 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1420
1421 if (ipv6_addr_any(&tunnel->parms.raddr))
1422 dev->header_ops = &ip6gre_header_ops;
1423
1424 return 0;
1425 }
1426
1427 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1428 {
1429 struct ip6_tnl *tunnel = netdev_priv(dev);
1430
1431 tunnel->dev = dev;
1432 tunnel->net = dev_net(dev);
1433 strcpy(tunnel->parms.name, dev->name);
1434
1435 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1436
1437 dev_hold(dev);
1438 }
1439
1440 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1441 .handler = gre_rcv,
1442 .err_handler = ip6gre_err,
1443 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1444 };
1445
1446 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1447 {
1448 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1449 struct net_device *dev, *aux;
1450 int prio;
1451
1452 for_each_netdev_safe(net, dev, aux)
1453 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1454 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1455 dev->rtnl_link_ops == &ip6erspan_tap_ops)
1456 unregister_netdevice_queue(dev, head);
1457
1458 for (prio = 0; prio < 4; prio++) {
1459 int h;
1460 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1461 struct ip6_tnl *t;
1462
1463 t = rtnl_dereference(ign->tunnels[prio][h]);
1464
1465 while (t) {
1466 /* If dev is in the same netns, it has already
1467 * been added to the list by the previous loop.
1468 */
1469 if (!net_eq(dev_net(t->dev), net))
1470 unregister_netdevice_queue(t->dev,
1471 head);
1472 t = rtnl_dereference(t->next);
1473 }
1474 }
1475 }
1476 }
1477
1478 static int __net_init ip6gre_init_net(struct net *net)
1479 {
1480 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1481 int err;
1482
1483 if (!net_has_fallback_tunnels(net))
1484 return 0;
1485 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1486 NET_NAME_UNKNOWN,
1487 ip6gre_tunnel_setup);
1488 if (!ign->fb_tunnel_dev) {
1489 err = -ENOMEM;
1490 goto err_alloc_dev;
1491 }
1492 dev_net_set(ign->fb_tunnel_dev, net);
1493 /* FB netdevice is special: we have one, and only one per netns.
1494 * Allowing to move it to another netns is clearly unsafe.
1495 */
1496 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1497
1498
1499 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1500 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1501
1502 err = register_netdev(ign->fb_tunnel_dev);
1503 if (err)
1504 goto err_reg_dev;
1505
1506 rcu_assign_pointer(ign->tunnels_wc[0],
1507 netdev_priv(ign->fb_tunnel_dev));
1508 return 0;
1509
1510 err_reg_dev:
1511 free_netdev(ign->fb_tunnel_dev);
1512 err_alloc_dev:
1513 return err;
1514 }
1515
1516 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1517 {
1518 struct net *net;
1519 LIST_HEAD(list);
1520
1521 rtnl_lock();
1522 list_for_each_entry(net, net_list, exit_list)
1523 ip6gre_destroy_tunnels(net, &list);
1524 unregister_netdevice_many(&list);
1525 rtnl_unlock();
1526 }
1527
1528 static struct pernet_operations ip6gre_net_ops = {
1529 .init = ip6gre_init_net,
1530 .exit_batch = ip6gre_exit_batch_net,
1531 .id = &ip6gre_net_id,
1532 .size = sizeof(struct ip6gre_net),
1533 };
1534
1535 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1536 struct netlink_ext_ack *extack)
1537 {
1538 __be16 flags;
1539
1540 if (!data)
1541 return 0;
1542
1543 flags = 0;
1544 if (data[IFLA_GRE_IFLAGS])
1545 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1546 if (data[IFLA_GRE_OFLAGS])
1547 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1548 if (flags & (GRE_VERSION|GRE_ROUTING))
1549 return -EINVAL;
1550
1551 return 0;
1552 }
1553
1554 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1555 struct netlink_ext_ack *extack)
1556 {
1557 struct in6_addr daddr;
1558
1559 if (tb[IFLA_ADDRESS]) {
1560 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1561 return -EINVAL;
1562 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1563 return -EADDRNOTAVAIL;
1564 }
1565
1566 if (!data)
1567 goto out;
1568
1569 if (data[IFLA_GRE_REMOTE]) {
1570 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1571 if (ipv6_addr_any(&daddr))
1572 return -EINVAL;
1573 }
1574
1575 out:
1576 return ip6gre_tunnel_validate(tb, data, extack);
1577 }
1578
1579 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1580 struct netlink_ext_ack *extack)
1581 {
1582 __be16 flags = 0;
1583 int ret, ver = 0;
1584
1585 if (!data)
1586 return 0;
1587
1588 ret = ip6gre_tap_validate(tb, data, extack);
1589 if (ret)
1590 return ret;
1591
1592 /* ERSPAN should only have GRE sequence and key flag */
1593 if (data[IFLA_GRE_OFLAGS])
1594 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1595 if (data[IFLA_GRE_IFLAGS])
1596 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1597 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1598 flags != (GRE_SEQ | GRE_KEY))
1599 return -EINVAL;
1600
1601 /* ERSPAN Session ID only has 10-bit. Since we reuse
1602 * 32-bit key field as ID, check it's range.
1603 */
1604 if (data[IFLA_GRE_IKEY] &&
1605 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1606 return -EINVAL;
1607
1608 if (data[IFLA_GRE_OKEY] &&
1609 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1610 return -EINVAL;
1611
1612 if (data[IFLA_GRE_ERSPAN_VER]) {
1613 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1614 if (ver != 1 && ver != 2)
1615 return -EINVAL;
1616 }
1617
1618 if (ver == 1) {
1619 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1620 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1621
1622 if (index & ~INDEX_MASK)
1623 return -EINVAL;
1624 }
1625 } else if (ver == 2) {
1626 if (data[IFLA_GRE_ERSPAN_DIR]) {
1627 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1628
1629 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1630 return -EINVAL;
1631 }
1632
1633 if (data[IFLA_GRE_ERSPAN_HWID]) {
1634 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1635
1636 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1637 return -EINVAL;
1638 }
1639 }
1640
1641 return 0;
1642 }
1643
1644 static void ip6gre_netlink_parms(struct nlattr *data[],
1645 struct __ip6_tnl_parm *parms)
1646 {
1647 memset(parms, 0, sizeof(*parms));
1648
1649 if (!data)
1650 return;
1651
1652 if (data[IFLA_GRE_LINK])
1653 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1654
1655 if (data[IFLA_GRE_IFLAGS])
1656 parms->i_flags = gre_flags_to_tnl_flags(
1657 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1658
1659 if (data[IFLA_GRE_OFLAGS])
1660 parms->o_flags = gre_flags_to_tnl_flags(
1661 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1662
1663 if (data[IFLA_GRE_IKEY])
1664 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1665
1666 if (data[IFLA_GRE_OKEY])
1667 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1668
1669 if (data[IFLA_GRE_LOCAL])
1670 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1671
1672 if (data[IFLA_GRE_REMOTE])
1673 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1674
1675 if (data[IFLA_GRE_TTL])
1676 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1677
1678 if (data[IFLA_GRE_ENCAP_LIMIT])
1679 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1680
1681 if (data[IFLA_GRE_FLOWINFO])
1682 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1683
1684 if (data[IFLA_GRE_FLAGS])
1685 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1686
1687 if (data[IFLA_GRE_FWMARK])
1688 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1689
1690 if (data[IFLA_GRE_COLLECT_METADATA])
1691 parms->collect_md = true;
1692
1693 if (data[IFLA_GRE_ERSPAN_VER])
1694 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1695
1696 if (parms->erspan_ver == 1) {
1697 if (data[IFLA_GRE_ERSPAN_INDEX])
1698 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1699 } else if (parms->erspan_ver == 2) {
1700 if (data[IFLA_GRE_ERSPAN_DIR])
1701 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1702 if (data[IFLA_GRE_ERSPAN_HWID])
1703 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1704 }
1705 }
1706
1707 static int ip6gre_tap_init(struct net_device *dev)
1708 {
1709 int ret;
1710
1711 ret = ip6gre_tunnel_init_common(dev);
1712 if (ret)
1713 return ret;
1714
1715 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1716
1717 return 0;
1718 }
1719
1720 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1721 .ndo_init = ip6gre_tap_init,
1722 .ndo_uninit = ip6gre_tunnel_uninit,
1723 .ndo_start_xmit = ip6gre_tunnel_xmit,
1724 .ndo_set_mac_address = eth_mac_addr,
1725 .ndo_validate_addr = eth_validate_addr,
1726 .ndo_change_mtu = ip6_tnl_change_mtu,
1727 .ndo_get_stats64 = ip_tunnel_get_stats64,
1728 .ndo_get_iflink = ip6_tnl_get_iflink,
1729 };
1730
1731 static int ip6erspan_tap_init(struct net_device *dev)
1732 {
1733 struct ip6_tnl *tunnel;
1734 int t_hlen;
1735 int ret;
1736
1737 tunnel = netdev_priv(dev);
1738
1739 tunnel->dev = dev;
1740 tunnel->net = dev_net(dev);
1741 strcpy(tunnel->parms.name, dev->name);
1742
1743 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1744 if (!dev->tstats)
1745 return -ENOMEM;
1746
1747 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1748 if (ret) {
1749 free_percpu(dev->tstats);
1750 dev->tstats = NULL;
1751 return ret;
1752 }
1753
1754 tunnel->tun_hlen = 8;
1755 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1756 erspan_hdr_len(tunnel->parms.erspan_ver);
1757 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1758
1759 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1760 dev->mtu = ETH_DATA_LEN - t_hlen;
1761 if (dev->type == ARPHRD_ETHER)
1762 dev->mtu -= ETH_HLEN;
1763 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1764 dev->mtu -= 8;
1765
1766 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1767 ip6gre_tnl_link_config(tunnel, 1);
1768
1769 return 0;
1770 }
1771
1772 static const struct net_device_ops ip6erspan_netdev_ops = {
1773 .ndo_init = ip6erspan_tap_init,
1774 .ndo_uninit = ip6gre_tunnel_uninit,
1775 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1776 .ndo_set_mac_address = eth_mac_addr,
1777 .ndo_validate_addr = eth_validate_addr,
1778 .ndo_change_mtu = ip6_tnl_change_mtu,
1779 .ndo_get_stats64 = ip_tunnel_get_stats64,
1780 .ndo_get_iflink = ip6_tnl_get_iflink,
1781 };
1782
1783 static void ip6gre_tap_setup(struct net_device *dev)
1784 {
1785
1786 ether_setup(dev);
1787
1788 dev->max_mtu = 0;
1789 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1790 dev->needs_free_netdev = true;
1791 dev->priv_destructor = ip6gre_dev_free;
1792
1793 dev->features |= NETIF_F_NETNS_LOCAL;
1794 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1795 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1796 netif_keep_dst(dev);
1797 }
1798
1799 bool is_ip6gretap_dev(const struct net_device *dev)
1800 {
1801 return dev->netdev_ops == &ip6gre_tap_netdev_ops;
1802 }
1803 EXPORT_SYMBOL_GPL(is_ip6gretap_dev);
1804
1805 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1806 struct ip_tunnel_encap *ipencap)
1807 {
1808 bool ret = false;
1809
1810 memset(ipencap, 0, sizeof(*ipencap));
1811
1812 if (!data)
1813 return ret;
1814
1815 if (data[IFLA_GRE_ENCAP_TYPE]) {
1816 ret = true;
1817 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1818 }
1819
1820 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1821 ret = true;
1822 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1823 }
1824
1825 if (data[IFLA_GRE_ENCAP_SPORT]) {
1826 ret = true;
1827 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1828 }
1829
1830 if (data[IFLA_GRE_ENCAP_DPORT]) {
1831 ret = true;
1832 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1833 }
1834
1835 return ret;
1836 }
1837
1838 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1839 struct nlattr *tb[], struct nlattr *data[],
1840 struct netlink_ext_ack *extack)
1841 {
1842 struct ip6_tnl *nt;
1843 struct net *net = dev_net(dev);
1844 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1845 struct ip_tunnel_encap ipencap;
1846 int err;
1847
1848 nt = netdev_priv(dev);
1849
1850 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1851 int err = ip6_tnl_encap_setup(nt, &ipencap);
1852
1853 if (err < 0)
1854 return err;
1855 }
1856
1857 ip6gre_netlink_parms(data, &nt->parms);
1858
1859 if (nt->parms.collect_md) {
1860 if (rtnl_dereference(ign->collect_md_tun))
1861 return -EEXIST;
1862 } else {
1863 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1864 return -EEXIST;
1865 }
1866
1867 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1868 eth_hw_addr_random(dev);
1869
1870 nt->dev = dev;
1871 nt->net = dev_net(dev);
1872
1873 err = register_netdevice(dev);
1874 if (err)
1875 goto out;
1876
1877 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1878
1879 if (tb[IFLA_MTU])
1880 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1881
1882 dev_hold(dev);
1883 ip6gre_tunnel_link(ign, nt);
1884
1885 out:
1886 return err;
1887 }
1888
1889 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1890 struct nlattr *data[],
1891 struct netlink_ext_ack *extack)
1892 {
1893 struct ip6_tnl *t, *nt = netdev_priv(dev);
1894 struct net *net = nt->net;
1895 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1896 struct __ip6_tnl_parm p;
1897 struct ip_tunnel_encap ipencap;
1898
1899 if (dev == ign->fb_tunnel_dev)
1900 return -EINVAL;
1901
1902 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1903 int err = ip6_tnl_encap_setup(nt, &ipencap);
1904
1905 if (err < 0)
1906 return err;
1907 }
1908
1909 ip6gre_netlink_parms(data, &p);
1910
1911 t = ip6gre_tunnel_locate(net, &p, 0);
1912
1913 if (t) {
1914 if (t->dev != dev)
1915 return -EEXIST;
1916 } else {
1917 t = nt;
1918 }
1919
1920 ip6gre_tunnel_unlink(ign, t);
1921 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1922 ip6gre_tunnel_link(ign, t);
1923 return 0;
1924 }
1925
1926 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
1927 {
1928 struct net *net = dev_net(dev);
1929 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1930
1931 if (dev != ign->fb_tunnel_dev)
1932 unregister_netdevice_queue(dev, head);
1933 }
1934
1935 static size_t ip6gre_get_size(const struct net_device *dev)
1936 {
1937 return
1938 /* IFLA_GRE_LINK */
1939 nla_total_size(4) +
1940 /* IFLA_GRE_IFLAGS */
1941 nla_total_size(2) +
1942 /* IFLA_GRE_OFLAGS */
1943 nla_total_size(2) +
1944 /* IFLA_GRE_IKEY */
1945 nla_total_size(4) +
1946 /* IFLA_GRE_OKEY */
1947 nla_total_size(4) +
1948 /* IFLA_GRE_LOCAL */
1949 nla_total_size(sizeof(struct in6_addr)) +
1950 /* IFLA_GRE_REMOTE */
1951 nla_total_size(sizeof(struct in6_addr)) +
1952 /* IFLA_GRE_TTL */
1953 nla_total_size(1) +
1954 /* IFLA_GRE_ENCAP_LIMIT */
1955 nla_total_size(1) +
1956 /* IFLA_GRE_FLOWINFO */
1957 nla_total_size(4) +
1958 /* IFLA_GRE_FLAGS */
1959 nla_total_size(4) +
1960 /* IFLA_GRE_ENCAP_TYPE */
1961 nla_total_size(2) +
1962 /* IFLA_GRE_ENCAP_FLAGS */
1963 nla_total_size(2) +
1964 /* IFLA_GRE_ENCAP_SPORT */
1965 nla_total_size(2) +
1966 /* IFLA_GRE_ENCAP_DPORT */
1967 nla_total_size(2) +
1968 /* IFLA_GRE_COLLECT_METADATA */
1969 nla_total_size(0) +
1970 /* IFLA_GRE_FWMARK */
1971 nla_total_size(4) +
1972 /* IFLA_GRE_ERSPAN_INDEX */
1973 nla_total_size(4) +
1974 0;
1975 }
1976
1977 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1978 {
1979 struct ip6_tnl *t = netdev_priv(dev);
1980 struct __ip6_tnl_parm *p = &t->parms;
1981
1982 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1983 nla_put_be16(skb, IFLA_GRE_IFLAGS,
1984 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
1985 nla_put_be16(skb, IFLA_GRE_OFLAGS,
1986 gre_tnl_flags_to_gre_flags(p->o_flags)) ||
1987 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1988 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
1989 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
1990 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
1991 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1992 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1993 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1994 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
1995 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark) ||
1996 nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
1997 goto nla_put_failure;
1998
1999 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2000 t->encap.type) ||
2001 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2002 t->encap.sport) ||
2003 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2004 t->encap.dport) ||
2005 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2006 t->encap.flags))
2007 goto nla_put_failure;
2008
2009 if (p->collect_md) {
2010 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2011 goto nla_put_failure;
2012 }
2013
2014 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2015 goto nla_put_failure;
2016
2017 if (p->erspan_ver == 1) {
2018 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2019 goto nla_put_failure;
2020 } else if (p->erspan_ver == 2) {
2021 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2022 goto nla_put_failure;
2023 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2024 goto nla_put_failure;
2025 }
2026
2027 return 0;
2028
2029 nla_put_failure:
2030 return -EMSGSIZE;
2031 }
2032
2033 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2034 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2035 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2036 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2037 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2038 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2039 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
2040 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
2041 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2042 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2043 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2044 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
2045 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2046 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2047 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2048 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
2049 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2050 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
2051 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2052 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2053 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2054 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
2055 };
2056
2057 static void ip6erspan_tap_setup(struct net_device *dev)
2058 {
2059 ether_setup(dev);
2060
2061 dev->netdev_ops = &ip6erspan_netdev_ops;
2062 dev->needs_free_netdev = true;
2063 dev->priv_destructor = ip6gre_dev_free;
2064
2065 dev->features |= NETIF_F_NETNS_LOCAL;
2066 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2067 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2068 netif_keep_dst(dev);
2069 }
2070
2071 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2072 .kind = "ip6gre",
2073 .maxtype = IFLA_GRE_MAX,
2074 .policy = ip6gre_policy,
2075 .priv_size = sizeof(struct ip6_tnl),
2076 .setup = ip6gre_tunnel_setup,
2077 .validate = ip6gre_tunnel_validate,
2078 .newlink = ip6gre_newlink,
2079 .changelink = ip6gre_changelink,
2080 .dellink = ip6gre_dellink,
2081 .get_size = ip6gre_get_size,
2082 .fill_info = ip6gre_fill_info,
2083 .get_link_net = ip6_tnl_get_link_net,
2084 };
2085
2086 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2087 .kind = "ip6gretap",
2088 .maxtype = IFLA_GRE_MAX,
2089 .policy = ip6gre_policy,
2090 .priv_size = sizeof(struct ip6_tnl),
2091 .setup = ip6gre_tap_setup,
2092 .validate = ip6gre_tap_validate,
2093 .newlink = ip6gre_newlink,
2094 .changelink = ip6gre_changelink,
2095 .get_size = ip6gre_get_size,
2096 .fill_info = ip6gre_fill_info,
2097 .get_link_net = ip6_tnl_get_link_net,
2098 };
2099
2100 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2101 .kind = "ip6erspan",
2102 .maxtype = IFLA_GRE_MAX,
2103 .policy = ip6gre_policy,
2104 .priv_size = sizeof(struct ip6_tnl),
2105 .setup = ip6erspan_tap_setup,
2106 .validate = ip6erspan_tap_validate,
2107 .newlink = ip6gre_newlink,
2108 .changelink = ip6gre_changelink,
2109 .get_size = ip6gre_get_size,
2110 .fill_info = ip6gre_fill_info,
2111 .get_link_net = ip6_tnl_get_link_net,
2112 };
2113
2114 /*
2115 * And now the modules code and kernel interface.
2116 */
2117
2118 static int __init ip6gre_init(void)
2119 {
2120 int err;
2121
2122 pr_info("GRE over IPv6 tunneling driver\n");
2123
2124 err = register_pernet_device(&ip6gre_net_ops);
2125 if (err < 0)
2126 return err;
2127
2128 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2129 if (err < 0) {
2130 pr_info("%s: can't add protocol\n", __func__);
2131 goto add_proto_failed;
2132 }
2133
2134 err = rtnl_link_register(&ip6gre_link_ops);
2135 if (err < 0)
2136 goto rtnl_link_failed;
2137
2138 err = rtnl_link_register(&ip6gre_tap_ops);
2139 if (err < 0)
2140 goto tap_ops_failed;
2141
2142 err = rtnl_link_register(&ip6erspan_tap_ops);
2143 if (err < 0)
2144 goto erspan_link_failed;
2145
2146 out:
2147 return err;
2148
2149 erspan_link_failed:
2150 rtnl_link_unregister(&ip6gre_tap_ops);
2151 tap_ops_failed:
2152 rtnl_link_unregister(&ip6gre_link_ops);
2153 rtnl_link_failed:
2154 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2155 add_proto_failed:
2156 unregister_pernet_device(&ip6gre_net_ops);
2157 goto out;
2158 }
2159
2160 static void __exit ip6gre_fini(void)
2161 {
2162 rtnl_link_unregister(&ip6gre_tap_ops);
2163 rtnl_link_unregister(&ip6gre_link_ops);
2164 rtnl_link_unregister(&ip6erspan_tap_ops);
2165 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2166 unregister_pernet_device(&ip6gre_net_ops);
2167 }
2168
2169 module_init(ip6gre_init);
2170 module_exit(ip6gre_fini);
2171 MODULE_LICENSE("GPL");
2172 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2173 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2174 MODULE_ALIAS_RTNL_LINK("ip6gre");
2175 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2176 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2177 MODULE_ALIAS_NETDEV("ip6gre0");
Linux with added FPC-III support