This source file includes following definitions.
- HASH_ADDR
- ip6gre_tunnel_lookup
- __ip6gre_bucket
- ip6gre_tunnel_link_md
- ip6erspan_tunnel_link_md
- ip6gre_tunnel_unlink_md
- ip6erspan_tunnel_unlink_md
- ip6gre_bucket
- ip6gre_tunnel_link
- ip6gre_tunnel_unlink
- ip6gre_tunnel_find
- ip6gre_tunnel_locate
- ip6erspan_tunnel_uninit
- ip6gre_tunnel_uninit
- ip6gre_err
- ip6gre_rcv
- ip6erspan_rcv
- gre_rcv
- gre_handle_offloads
- prepare_ip6gre_xmit_ipv4
- prepare_ip6gre_xmit_ipv6
- __gre6_xmit
- ip6gre_xmit_ipv4
- ip6gre_xmit_ipv6
- ip6gre_tnl_addr_conflict
- ip6gre_xmit_other
- ip6gre_tunnel_xmit
- ip6erspan_tunnel_xmit
- ip6gre_tnl_link_config_common
- ip6gre_tnl_link_config_route
- ip6gre_calc_hlen
- ip6gre_tnl_link_config
- ip6gre_tnl_copy_tnl_parm
- ip6gre_tnl_change
- ip6gre_tnl_parm_from_user
- ip6gre_tnl_parm_to_user
- ip6gre_tunnel_ioctl
- ip6gre_header
- ip6gre_dev_free
- ip6gre_tunnel_setup
- ip6gre_tnl_init_features
- ip6gre_tunnel_init_common
- ip6gre_tunnel_init
- ip6gre_fb_tunnel_init
- ip6gre_destroy_tunnels
- ip6gre_init_net
- ip6gre_exit_batch_net
- ip6gre_tunnel_validate
- ip6gre_tap_validate
- ip6erspan_tap_validate
- ip6erspan_set_version
- ip6gre_netlink_parms
- ip6gre_tap_init
- ip6erspan_calc_hlen
- ip6erspan_tap_init
- ip6gre_tap_setup
- ip6gre_netlink_encap_parms
- ip6gre_newlink_common
- ip6gre_newlink
- ip6gre_changelink_common
- ip6gre_changelink
- ip6gre_dellink
- ip6gre_get_size
- ip6gre_fill_info
- ip6erspan_tap_setup
- ip6erspan_newlink
- ip6erspan_tnl_link_config
- ip6erspan_tnl_change
- ip6erspan_changelink
- ip6gre_init
- ip6gre_fini
1
2
3
4
5
6
7
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10 #include <linux/capability.h>
11 #include <linux/module.h>
12 #include <linux/types.h>
13 #include <linux/kernel.h>
14 #include <linux/slab.h>
15 #include <linux/uaccess.h>
16 #include <linux/skbuff.h>
17 #include <linux/netdevice.h>
18 #include <linux/in.h>
19 #include <linux/tcp.h>
20 #include <linux/udp.h>
21 #include <linux/if_arp.h>
22 #include <linux/init.h>
23 #include <linux/in6.h>
24 #include <linux/inetdevice.h>
25 #include <linux/igmp.h>
26 #include <linux/netfilter_ipv4.h>
27 #include <linux/etherdevice.h>
28 #include <linux/if_ether.h>
29 #include <linux/hash.h>
30 #include <linux/if_tunnel.h>
31 #include <linux/ip6_tunnel.h>
32
33 #include <net/sock.h>
34 #include <net/ip.h>
35 #include <net/ip_tunnels.h>
36 #include <net/icmp.h>
37 #include <net/protocol.h>
38 #include <net/addrconf.h>
39 #include <net/arp.h>
40 #include <net/checksum.h>
41 #include <net/dsfield.h>
42 #include <net/inet_ecn.h>
43 #include <net/xfrm.h>
44 #include <net/net_namespace.h>
45 #include <net/netns/generic.h>
46 #include <net/rtnetlink.h>
47
48 #include <net/ipv6.h>
49 #include <net/ip6_fib.h>
50 #include <net/ip6_route.h>
51 #include <net/ip6_tunnel.h>
52 #include <net/gre.h>
53 #include <net/erspan.h>
54 #include <net/dst_metadata.h>
55
56
57 static bool log_ecn_error = true;
58 module_param(log_ecn_error, bool, 0644);
59 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
60
61 #define IP6_GRE_HASH_SIZE_SHIFT 5
62 #define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
63
64 static unsigned int ip6gre_net_id __read_mostly;
65 struct ip6gre_net {
66 struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
67
68 struct ip6_tnl __rcu *collect_md_tun;
69 struct ip6_tnl __rcu *collect_md_tun_erspan;
70 struct net_device *fb_tunnel_dev;
71 };
72
73 static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
74 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
75 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly;
76 static int ip6gre_tunnel_init(struct net_device *dev);
77 static void ip6gre_tunnel_setup(struct net_device *dev);
78 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
79 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
80 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu);
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
101 static u32 HASH_ADDR(const struct in6_addr *addr)
102 {
103 u32 hash = ipv6_addr_hash(addr);
104
105 return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
106 }
107
108 #define tunnels_r_l tunnels[3]
109 #define tunnels_r tunnels[2]
110 #define tunnels_l tunnels[1]
111 #define tunnels_wc tunnels[0]
112
113
114
115 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
116 const struct in6_addr *remote, const struct in6_addr *local,
117 __be32 key, __be16 gre_proto)
118 {
119 struct net *net = dev_net(dev);
120 int link = dev->ifindex;
121 unsigned int h0 = HASH_ADDR(remote);
122 unsigned int h1 = HASH_KEY(key);
123 struct ip6_tnl *t, *cand = NULL;
124 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
125 int dev_type = (gre_proto == htons(ETH_P_TEB) ||
126 gre_proto == htons(ETH_P_ERSPAN) ||
127 gre_proto == htons(ETH_P_ERSPAN2)) ?
128 ARPHRD_ETHER : ARPHRD_IP6GRE;
129 int score, cand_score = 4;
130
131 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
132 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
133 !ipv6_addr_equal(remote, &t->parms.raddr) ||
134 key != t->parms.i_key ||
135 !(t->dev->flags & IFF_UP))
136 continue;
137
138 if (t->dev->type != ARPHRD_IP6GRE &&
139 t->dev->type != dev_type)
140 continue;
141
142 score = 0;
143 if (t->parms.link != link)
144 score |= 1;
145 if (t->dev->type != dev_type)
146 score |= 2;
147 if (score == 0)
148 return t;
149
150 if (score < cand_score) {
151 cand = t;
152 cand_score = score;
153 }
154 }
155
156 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
157 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
158 key != t->parms.i_key ||
159 !(t->dev->flags & IFF_UP))
160 continue;
161
162 if (t->dev->type != ARPHRD_IP6GRE &&
163 t->dev->type != dev_type)
164 continue;
165
166 score = 0;
167 if (t->parms.link != link)
168 score |= 1;
169 if (t->dev->type != dev_type)
170 score |= 2;
171 if (score == 0)
172 return t;
173
174 if (score < cand_score) {
175 cand = t;
176 cand_score = score;
177 }
178 }
179
180 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
181 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
182 (!ipv6_addr_equal(local, &t->parms.raddr) ||
183 !ipv6_addr_is_multicast(local))) ||
184 key != t->parms.i_key ||
185 !(t->dev->flags & IFF_UP))
186 continue;
187
188 if (t->dev->type != ARPHRD_IP6GRE &&
189 t->dev->type != dev_type)
190 continue;
191
192 score = 0;
193 if (t->parms.link != link)
194 score |= 1;
195 if (t->dev->type != dev_type)
196 score |= 2;
197 if (score == 0)
198 return t;
199
200 if (score < cand_score) {
201 cand = t;
202 cand_score = score;
203 }
204 }
205
206 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
207 if (t->parms.i_key != key ||
208 !(t->dev->flags & IFF_UP))
209 continue;
210
211 if (t->dev->type != ARPHRD_IP6GRE &&
212 t->dev->type != dev_type)
213 continue;
214
215 score = 0;
216 if (t->parms.link != link)
217 score |= 1;
218 if (t->dev->type != dev_type)
219 score |= 2;
220 if (score == 0)
221 return t;
222
223 if (score < cand_score) {
224 cand = t;
225 cand_score = score;
226 }
227 }
228
229 if (cand)
230 return cand;
231
232 if (gre_proto == htons(ETH_P_ERSPAN) ||
233 gre_proto == htons(ETH_P_ERSPAN2))
234 t = rcu_dereference(ign->collect_md_tun_erspan);
235 else
236 t = rcu_dereference(ign->collect_md_tun);
237
238 if (t && t->dev->flags & IFF_UP)
239 return t;
240
241 dev = ign->fb_tunnel_dev;
242 if (dev && dev->flags & IFF_UP)
243 return netdev_priv(dev);
244
245 return NULL;
246 }
247
248 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
249 const struct __ip6_tnl_parm *p)
250 {
251 const struct in6_addr *remote = &p->raddr;
252 const struct in6_addr *local = &p->laddr;
253 unsigned int h = HASH_KEY(p->i_key);
254 int prio = 0;
255
256 if (!ipv6_addr_any(local))
257 prio |= 1;
258 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
259 prio |= 2;
260 h ^= HASH_ADDR(remote);
261 }
262
263 return &ign->tunnels[prio][h];
264 }
265
266 static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
267 {
268 if (t->parms.collect_md)
269 rcu_assign_pointer(ign->collect_md_tun, t);
270 }
271
272 static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
273 {
274 if (t->parms.collect_md)
275 rcu_assign_pointer(ign->collect_md_tun_erspan, t);
276 }
277
278 static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t)
279 {
280 if (t->parms.collect_md)
281 rcu_assign_pointer(ign->collect_md_tun, NULL);
282 }
283
284 static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign,
285 struct ip6_tnl *t)
286 {
287 if (t->parms.collect_md)
288 rcu_assign_pointer(ign->collect_md_tun_erspan, NULL);
289 }
290
291 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
292 const struct ip6_tnl *t)
293 {
294 return __ip6gre_bucket(ign, &t->parms);
295 }
296
297 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
298 {
299 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
300
301 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
302 rcu_assign_pointer(*tp, t);
303 }
304
305 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
306 {
307 struct ip6_tnl __rcu **tp;
308 struct ip6_tnl *iter;
309
310 for (tp = ip6gre_bucket(ign, t);
311 (iter = rtnl_dereference(*tp)) != NULL;
312 tp = &iter->next) {
313 if (t == iter) {
314 rcu_assign_pointer(*tp, t->next);
315 break;
316 }
317 }
318 }
319
320 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
321 const struct __ip6_tnl_parm *parms,
322 int type)
323 {
324 const struct in6_addr *remote = &parms->raddr;
325 const struct in6_addr *local = &parms->laddr;
326 __be32 key = parms->i_key;
327 int link = parms->link;
328 struct ip6_tnl *t;
329 struct ip6_tnl __rcu **tp;
330 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
331
332 for (tp = __ip6gre_bucket(ign, parms);
333 (t = rtnl_dereference(*tp)) != NULL;
334 tp = &t->next)
335 if (ipv6_addr_equal(local, &t->parms.laddr) &&
336 ipv6_addr_equal(remote, &t->parms.raddr) &&
337 key == t->parms.i_key &&
338 link == t->parms.link &&
339 type == t->dev->type)
340 break;
341
342 return t;
343 }
344
345 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
346 const struct __ip6_tnl_parm *parms, int create)
347 {
348 struct ip6_tnl *t, *nt;
349 struct net_device *dev;
350 char name[IFNAMSIZ];
351 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
352
353 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
354 if (t && create)
355 return NULL;
356 if (t || !create)
357 return t;
358
359 if (parms->name[0]) {
360 if (!dev_valid_name(parms->name))
361 return NULL;
362 strlcpy(name, parms->name, IFNAMSIZ);
363 } else {
364 strcpy(name, "ip6gre%d");
365 }
366 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
367 ip6gre_tunnel_setup);
368 if (!dev)
369 return NULL;
370
371 dev_net_set(dev, net);
372
373 nt = netdev_priv(dev);
374 nt->parms = *parms;
375 dev->rtnl_link_ops = &ip6gre_link_ops;
376
377 nt->dev = dev;
378 nt->net = dev_net(dev);
379
380 if (register_netdevice(dev) < 0)
381 goto failed_free;
382
383 ip6gre_tnl_link_config(nt, 1);
384
385
386 if (!(nt->parms.o_flags & TUNNEL_SEQ))
387 dev->features |= NETIF_F_LLTX;
388
389 dev_hold(dev);
390 ip6gre_tunnel_link(ign, nt);
391 return nt;
392
393 failed_free:
394 free_netdev(dev);
395 return NULL;
396 }
397
398 static void ip6erspan_tunnel_uninit(struct net_device *dev)
399 {
400 struct ip6_tnl *t = netdev_priv(dev);
401 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
402
403 ip6erspan_tunnel_unlink_md(ign, t);
404 ip6gre_tunnel_unlink(ign, t);
405 dst_cache_reset(&t->dst_cache);
406 dev_put(dev);
407 }
408
409 static void ip6gre_tunnel_uninit(struct net_device *dev)
410 {
411 struct ip6_tnl *t = netdev_priv(dev);
412 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
413
414 ip6gre_tunnel_unlink_md(ign, t);
415 ip6gre_tunnel_unlink(ign, t);
416 dst_cache_reset(&t->dst_cache);
417 dev_put(dev);
418 }
419
420
421 static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
422 u8 type, u8 code, int offset, __be32 info)
423 {
424 struct net *net = dev_net(skb->dev);
425 const struct ipv6hdr *ipv6h;
426 struct tnl_ptk_info tpi;
427 struct ip6_tnl *t;
428
429 if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6),
430 offset) < 0)
431 return -EINVAL;
432
433 ipv6h = (const struct ipv6hdr *)skb->data;
434 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
435 tpi.key, tpi.proto);
436 if (!t)
437 return -ENOENT;
438
439 switch (type) {
440 struct ipv6_tlv_tnl_enc_lim *tel;
441 __u32 teli;
442 case ICMPV6_DEST_UNREACH:
443 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
444 t->parms.name);
445 if (code != ICMPV6_PORT_UNREACH)
446 break;
447 return 0;
448 case ICMPV6_TIME_EXCEED:
449 if (code == ICMPV6_EXC_HOPLIMIT) {
450 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
451 t->parms.name);
452 break;
453 }
454 return 0;
455 case ICMPV6_PARAMPROB:
456 teli = 0;
457 if (code == ICMPV6_HDR_FIELD)
458 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
459
460 if (teli && teli == be32_to_cpu(info) - 2) {
461 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
462 if (tel->encap_limit == 0) {
463 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
464 t->parms.name);
465 }
466 } else {
467 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
468 t->parms.name);
469 }
470 return 0;
471 case ICMPV6_PKT_TOOBIG:
472 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
473 return 0;
474 case NDISC_REDIRECT:
475 ip6_redirect(skb, net, skb->dev->ifindex, 0,
476 sock_net_uid(net, NULL));
477 return 0;
478 }
479
480 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
481 t->err_count++;
482 else
483 t->err_count = 1;
484 t->err_time = jiffies;
485
486 return 0;
487 }
488
489 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
490 {
491 const struct ipv6hdr *ipv6h;
492 struct ip6_tnl *tunnel;
493
494 ipv6h = ipv6_hdr(skb);
495 tunnel = ip6gre_tunnel_lookup(skb->dev,
496 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
497 tpi->proto);
498 if (tunnel) {
499 if (tunnel->parms.collect_md) {
500 struct metadata_dst *tun_dst;
501 __be64 tun_id;
502 __be16 flags;
503
504 flags = tpi->flags;
505 tun_id = key32_to_tunnel_id(tpi->key);
506
507 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
508 if (!tun_dst)
509 return PACKET_REJECT;
510
511 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
512 } else {
513 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
514 }
515
516 return PACKET_RCVD;
517 }
518
519 return PACKET_REJECT;
520 }
521
522 static int ip6erspan_rcv(struct sk_buff *skb,
523 struct tnl_ptk_info *tpi,
524 int gre_hdr_len)
525 {
526 struct erspan_base_hdr *ershdr;
527 const struct ipv6hdr *ipv6h;
528 struct erspan_md2 *md2;
529 struct ip6_tnl *tunnel;
530 u8 ver;
531
532 ipv6h = ipv6_hdr(skb);
533 ershdr = (struct erspan_base_hdr *)skb->data;
534 ver = ershdr->ver;
535
536 tunnel = ip6gre_tunnel_lookup(skb->dev,
537 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
538 tpi->proto);
539 if (tunnel) {
540 int len = erspan_hdr_len(ver);
541
542 if (unlikely(!pskb_may_pull(skb, len)))
543 return PACKET_REJECT;
544
545 if (__iptunnel_pull_header(skb, len,
546 htons(ETH_P_TEB),
547 false, false) < 0)
548 return PACKET_REJECT;
549
550 if (tunnel->parms.collect_md) {
551 struct erspan_metadata *pkt_md, *md;
552 struct metadata_dst *tun_dst;
553 struct ip_tunnel_info *info;
554 unsigned char *gh;
555 __be64 tun_id;
556 __be16 flags;
557
558 tpi->flags |= TUNNEL_KEY;
559 flags = tpi->flags;
560 tun_id = key32_to_tunnel_id(tpi->key);
561
562 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
563 sizeof(*md));
564 if (!tun_dst)
565 return PACKET_REJECT;
566
567
568
569
570
571 gh = skb_network_header(skb) +
572 skb_network_header_len(skb);
573 pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len +
574 sizeof(*ershdr));
575 info = &tun_dst->u.tun_info;
576 md = ip_tunnel_info_opts(info);
577 md->version = ver;
578 md2 = &md->u.md2;
579 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
580 ERSPAN_V2_MDSIZE);
581 info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
582 info->options_len = sizeof(*md);
583
584 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
585
586 } else {
587 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
588 }
589
590 return PACKET_RCVD;
591 }
592
593 return PACKET_REJECT;
594 }
595
596 static int gre_rcv(struct sk_buff *skb)
597 {
598 struct tnl_ptk_info tpi;
599 bool csum_err = false;
600 int hdr_len;
601
602 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
603 if (hdr_len < 0)
604 goto drop;
605
606 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
607 goto drop;
608
609 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
610 tpi.proto == htons(ETH_P_ERSPAN2))) {
611 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
612 return 0;
613 goto out;
614 }
615
616 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
617 return 0;
618
619 out:
620 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
621 drop:
622 kfree_skb(skb);
623 return 0;
624 }
625
626 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
627 {
628 return iptunnel_handle_offloads(skb,
629 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
630 }
631
632 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
633 struct net_device *dev,
634 struct flowi6 *fl6, __u8 *dsfield,
635 int *encap_limit)
636 {
637 const struct iphdr *iph = ip_hdr(skb);
638 struct ip6_tnl *t = netdev_priv(dev);
639
640 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
641 *encap_limit = t->parms.encap_limit;
642
643 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
644
645 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
646 *dsfield = ipv4_get_dsfield(iph);
647 else
648 *dsfield = ip6_tclass(t->parms.flowinfo);
649
650 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
651 fl6->flowi6_mark = skb->mark;
652 else
653 fl6->flowi6_mark = t->parms.fwmark;
654
655 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
656 }
657
658 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
659 struct net_device *dev,
660 struct flowi6 *fl6, __u8 *dsfield,
661 int *encap_limit)
662 {
663 struct ipv6hdr *ipv6h;
664 struct ip6_tnl *t = netdev_priv(dev);
665 __u16 offset;
666
667 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
668
669 ipv6h = ipv6_hdr(skb);
670
671 if (offset > 0) {
672 struct ipv6_tlv_tnl_enc_lim *tel;
673
674 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
675 if (tel->encap_limit == 0) {
676 icmpv6_send(skb, ICMPV6_PARAMPROB,
677 ICMPV6_HDR_FIELD, offset + 2);
678 return -1;
679 }
680 *encap_limit = tel->encap_limit - 1;
681 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
682 *encap_limit = t->parms.encap_limit;
683 }
684
685 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
686
687 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
688 *dsfield = ipv6_get_dsfield(ipv6h);
689 else
690 *dsfield = ip6_tclass(t->parms.flowinfo);
691
692 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
693 fl6->flowlabel |= ip6_flowlabel(ipv6h);
694
695 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
696 fl6->flowi6_mark = skb->mark;
697 else
698 fl6->flowi6_mark = t->parms.fwmark;
699
700 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
701
702 return 0;
703 }
704
705 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
706 struct net_device *dev, __u8 dsfield,
707 struct flowi6 *fl6, int encap_limit,
708 __u32 *pmtu, __be16 proto)
709 {
710 struct ip6_tnl *tunnel = netdev_priv(dev);
711 __be16 protocol;
712
713 if (dev->type == ARPHRD_ETHER)
714 IPCB(skb)->flags = 0;
715
716 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
717 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
718 else
719 fl6->daddr = tunnel->parms.raddr;
720
721 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
722 return -ENOMEM;
723
724
725 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
726
727 if (tunnel->parms.collect_md) {
728 struct ip_tunnel_info *tun_info;
729 const struct ip_tunnel_key *key;
730 __be16 flags;
731
732 tun_info = skb_tunnel_info(skb);
733 if (unlikely(!tun_info ||
734 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
735 ip_tunnel_info_af(tun_info) != AF_INET6))
736 return -EINVAL;
737
738 key = &tun_info->key;
739 memset(fl6, 0, sizeof(*fl6));
740 fl6->flowi6_proto = IPPROTO_GRE;
741 fl6->daddr = key->u.ipv6.dst;
742 fl6->flowlabel = key->label;
743 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
744
745 dsfield = key->tos;
746 flags = key->tun_flags &
747 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
748 tunnel->tun_hlen = gre_calc_hlen(flags);
749
750 gre_build_header(skb, tunnel->tun_hlen,
751 flags, protocol,
752 tunnel_id_to_key32(tun_info->key.tun_id),
753 (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++)
754 : 0);
755
756 } else {
757 if (tunnel->parms.o_flags & TUNNEL_SEQ)
758 tunnel->o_seqno++;
759
760 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
761 protocol, tunnel->parms.o_key,
762 htonl(tunnel->o_seqno));
763 }
764
765 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
766 NEXTHDR_GRE);
767 }
768
769 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
770 {
771 struct ip6_tnl *t = netdev_priv(dev);
772 int encap_limit = -1;
773 struct flowi6 fl6;
774 __u8 dsfield = 0;
775 __u32 mtu;
776 int err;
777
778 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
779
780 if (!t->parms.collect_md)
781 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
782 &dsfield, &encap_limit);
783
784 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
785 if (err)
786 return -1;
787
788 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
789 skb->protocol);
790 if (err != 0) {
791
792 if (err == -EMSGSIZE)
793 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
794 htonl(mtu));
795 return -1;
796 }
797
798 return 0;
799 }
800
801 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
802 {
803 struct ip6_tnl *t = netdev_priv(dev);
804 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
805 int encap_limit = -1;
806 struct flowi6 fl6;
807 __u8 dsfield = 0;
808 __u32 mtu;
809 int err;
810
811 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
812 return -1;
813
814 if (!t->parms.collect_md &&
815 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
816 return -1;
817
818 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
819 return -1;
820
821 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
822 &mtu, skb->protocol);
823 if (err != 0) {
824 if (err == -EMSGSIZE)
825 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
826 return -1;
827 }
828
829 return 0;
830 }
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
847 const struct ipv6hdr *hdr)
848 {
849 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
850 }
851
852 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
853 {
854 struct ip6_tnl *t = netdev_priv(dev);
855 int encap_limit = -1;
856 struct flowi6 fl6;
857 __u32 mtu;
858 int err;
859
860 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
861 encap_limit = t->parms.encap_limit;
862
863 if (!t->parms.collect_md)
864 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
865
866 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
867 if (err)
868 return err;
869
870 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
871
872 return err;
873 }
874
875 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
876 struct net_device *dev)
877 {
878 struct ip6_tnl *t = netdev_priv(dev);
879 struct net_device_stats *stats = &t->dev->stats;
880 int ret;
881
882 if (!pskb_inet_may_pull(skb))
883 goto tx_err;
884
885 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
886 goto tx_err;
887
888 switch (skb->protocol) {
889 case htons(ETH_P_IP):
890 ret = ip6gre_xmit_ipv4(skb, dev);
891 break;
892 case htons(ETH_P_IPV6):
893 ret = ip6gre_xmit_ipv6(skb, dev);
894 break;
895 default:
896 ret = ip6gre_xmit_other(skb, dev);
897 break;
898 }
899
900 if (ret < 0)
901 goto tx_err;
902
903 return NETDEV_TX_OK;
904
905 tx_err:
906 stats->tx_errors++;
907 stats->tx_dropped++;
908 kfree_skb(skb);
909 return NETDEV_TX_OK;
910 }
911
912 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
913 struct net_device *dev)
914 {
915 struct ip6_tnl *t = netdev_priv(dev);
916 struct dst_entry *dst = skb_dst(skb);
917 struct net_device_stats *stats;
918 bool truncate = false;
919 int encap_limit = -1;
920 __u8 dsfield = false;
921 struct flowi6 fl6;
922 int err = -EINVAL;
923 __be16 proto;
924 __u32 mtu;
925 int nhoff;
926 int thoff;
927
928 if (!pskb_inet_may_pull(skb))
929 goto tx_err;
930
931 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
932 goto tx_err;
933
934 if (gre_handle_offloads(skb, false))
935 goto tx_err;
936
937 if (skb->len > dev->mtu + dev->hard_header_len) {
938 pskb_trim(skb, dev->mtu + dev->hard_header_len);
939 truncate = true;
940 }
941
942 nhoff = skb_network_header(skb) - skb_mac_header(skb);
943 if (skb->protocol == htons(ETH_P_IP) &&
944 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
945 truncate = true;
946
947 thoff = skb_transport_header(skb) - skb_mac_header(skb);
948 if (skb->protocol == htons(ETH_P_IPV6) &&
949 (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff))
950 truncate = true;
951
952 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
953 goto tx_err;
954
955 t->parms.o_flags &= ~TUNNEL_KEY;
956 IPCB(skb)->flags = 0;
957
958
959
960
961 if (t->parms.collect_md) {
962 struct ip_tunnel_info *tun_info;
963 const struct ip_tunnel_key *key;
964 struct erspan_metadata *md;
965 __be32 tun_id;
966
967 tun_info = skb_tunnel_info(skb);
968 if (unlikely(!tun_info ||
969 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
970 ip_tunnel_info_af(tun_info) != AF_INET6))
971 goto tx_err;
972
973 key = &tun_info->key;
974 memset(&fl6, 0, sizeof(fl6));
975 fl6.flowi6_proto = IPPROTO_GRE;
976 fl6.daddr = key->u.ipv6.dst;
977 fl6.flowlabel = key->label;
978 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
979
980 dsfield = key->tos;
981 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
982 goto tx_err;
983 if (tun_info->options_len < sizeof(*md))
984 goto tx_err;
985 md = ip_tunnel_info_opts(tun_info);
986
987 tun_id = tunnel_id_to_key32(key->tun_id);
988 if (md->version == 1) {
989 erspan_build_header(skb,
990 ntohl(tun_id),
991 ntohl(md->u.index), truncate,
992 false);
993 } else if (md->version == 2) {
994 erspan_build_header_v2(skb,
995 ntohl(tun_id),
996 md->u.md2.dir,
997 get_hwid(&md->u.md2),
998 truncate, false);
999 } else {
1000 goto tx_err;
1001 }
1002 } else {
1003 switch (skb->protocol) {
1004 case htons(ETH_P_IP):
1005 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1006 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1007 &dsfield, &encap_limit);
1008 break;
1009 case htons(ETH_P_IPV6):
1010 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1011 goto tx_err;
1012 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1013 &dsfield, &encap_limit))
1014 goto tx_err;
1015 break;
1016 default:
1017 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1018 break;
1019 }
1020
1021 if (t->parms.erspan_ver == 1)
1022 erspan_build_header(skb, ntohl(t->parms.o_key),
1023 t->parms.index,
1024 truncate, false);
1025 else if (t->parms.erspan_ver == 2)
1026 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1027 t->parms.dir,
1028 t->parms.hwid,
1029 truncate, false);
1030 else
1031 goto tx_err;
1032
1033 fl6.daddr = t->parms.raddr;
1034 }
1035
1036
1037 proto = (t->parms.erspan_ver == 1) ? htons(ETH_P_ERSPAN)
1038 : htons(ETH_P_ERSPAN2);
1039 gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(t->o_seqno++));
1040
1041
1042 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1043 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false);
1044
1045 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1046 NEXTHDR_GRE);
1047 if (err != 0) {
1048
1049 if (err == -EMSGSIZE) {
1050 if (skb->protocol == htons(ETH_P_IP))
1051 icmp_send(skb, ICMP_DEST_UNREACH,
1052 ICMP_FRAG_NEEDED, htonl(mtu));
1053 else
1054 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1055 }
1056
1057 goto tx_err;
1058 }
1059 return NETDEV_TX_OK;
1060
1061 tx_err:
1062 stats = &t->dev->stats;
1063 stats->tx_errors++;
1064 stats->tx_dropped++;
1065 kfree_skb(skb);
1066 return NETDEV_TX_OK;
1067 }
1068
1069 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1070 {
1071 struct net_device *dev = t->dev;
1072 struct __ip6_tnl_parm *p = &t->parms;
1073 struct flowi6 *fl6 = &t->fl.u.ip6;
1074
1075 if (dev->type != ARPHRD_ETHER) {
1076 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1077 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1078 }
1079
1080
1081 fl6->saddr = p->laddr;
1082 fl6->daddr = p->raddr;
1083 fl6->flowi6_oif = p->link;
1084 fl6->flowlabel = 0;
1085 fl6->flowi6_proto = IPPROTO_GRE;
1086
1087 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1088 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1089 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1090 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1091
1092 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1093 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1094
1095 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1096 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1097 dev->flags |= IFF_POINTOPOINT;
1098 else
1099 dev->flags &= ~IFF_POINTOPOINT;
1100 }
1101
1102 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1103 int t_hlen)
1104 {
1105 const struct __ip6_tnl_parm *p = &t->parms;
1106 struct net_device *dev = t->dev;
1107
1108 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1109 int strict = (ipv6_addr_type(&p->raddr) &
1110 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1111
1112 struct rt6_info *rt = rt6_lookup(t->net,
1113 &p->raddr, &p->laddr,
1114 p->link, NULL, strict);
1115
1116 if (!rt)
1117 return;
1118
1119 if (rt->dst.dev) {
1120 dev->needed_headroom = rt->dst.dev->hard_header_len +
1121 t_hlen;
1122
1123 if (set_mtu) {
1124 dev->mtu = rt->dst.dev->mtu - t_hlen;
1125 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1126 dev->mtu -= 8;
1127 if (dev->type == ARPHRD_ETHER)
1128 dev->mtu -= ETH_HLEN;
1129
1130 if (dev->mtu < IPV6_MIN_MTU)
1131 dev->mtu = IPV6_MIN_MTU;
1132 }
1133 }
1134 ip6_rt_put(rt);
1135 }
1136 }
1137
1138 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1139 {
1140 int t_hlen;
1141
1142 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1143 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1144
1145 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1146 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1147 return t_hlen;
1148 }
1149
1150 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1151 {
1152 ip6gre_tnl_link_config_common(t);
1153 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1154 }
1155
1156 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1157 const struct __ip6_tnl_parm *p)
1158 {
1159 t->parms.laddr = p->laddr;
1160 t->parms.raddr = p->raddr;
1161 t->parms.flags = p->flags;
1162 t->parms.hop_limit = p->hop_limit;
1163 t->parms.encap_limit = p->encap_limit;
1164 t->parms.flowinfo = p->flowinfo;
1165 t->parms.link = p->link;
1166 t->parms.proto = p->proto;
1167 t->parms.i_key = p->i_key;
1168 t->parms.o_key = p->o_key;
1169 t->parms.i_flags = p->i_flags;
1170 t->parms.o_flags = p->o_flags;
1171 t->parms.fwmark = p->fwmark;
1172 t->parms.erspan_ver = p->erspan_ver;
1173 t->parms.index = p->index;
1174 t->parms.dir = p->dir;
1175 t->parms.hwid = p->hwid;
1176 dst_cache_reset(&t->dst_cache);
1177 }
1178
1179 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1180 int set_mtu)
1181 {
1182 ip6gre_tnl_copy_tnl_parm(t, p);
1183 ip6gre_tnl_link_config(t, set_mtu);
1184 return 0;
1185 }
1186
1187 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1188 const struct ip6_tnl_parm2 *u)
1189 {
1190 p->laddr = u->laddr;
1191 p->raddr = u->raddr;
1192 p->flags = u->flags;
1193 p->hop_limit = u->hop_limit;
1194 p->encap_limit = u->encap_limit;
1195 p->flowinfo = u->flowinfo;
1196 p->link = u->link;
1197 p->i_key = u->i_key;
1198 p->o_key = u->o_key;
1199 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1200 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1201 memcpy(p->name, u->name, sizeof(u->name));
1202 }
1203
1204 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1205 const struct __ip6_tnl_parm *p)
1206 {
1207 u->proto = IPPROTO_GRE;
1208 u->laddr = p->laddr;
1209 u->raddr = p->raddr;
1210 u->flags = p->flags;
1211 u->hop_limit = p->hop_limit;
1212 u->encap_limit = p->encap_limit;
1213 u->flowinfo = p->flowinfo;
1214 u->link = p->link;
1215 u->i_key = p->i_key;
1216 u->o_key = p->o_key;
1217 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1218 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1219 memcpy(u->name, p->name, sizeof(u->name));
1220 }
1221
1222 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1223 struct ifreq *ifr, int cmd)
1224 {
1225 int err = 0;
1226 struct ip6_tnl_parm2 p;
1227 struct __ip6_tnl_parm p1;
1228 struct ip6_tnl *t = netdev_priv(dev);
1229 struct net *net = t->net;
1230 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1231
1232 memset(&p1, 0, sizeof(p1));
1233
1234 switch (cmd) {
1235 case SIOCGETTUNNEL:
1236 if (dev == ign->fb_tunnel_dev) {
1237 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1238 err = -EFAULT;
1239 break;
1240 }
1241 ip6gre_tnl_parm_from_user(&p1, &p);
1242 t = ip6gre_tunnel_locate(net, &p1, 0);
1243 if (!t)
1244 t = netdev_priv(dev);
1245 }
1246 memset(&p, 0, sizeof(p));
1247 ip6gre_tnl_parm_to_user(&p, &t->parms);
1248 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1249 err = -EFAULT;
1250 break;
1251
1252 case SIOCADDTUNNEL:
1253 case SIOCCHGTUNNEL:
1254 err = -EPERM;
1255 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1256 goto done;
1257
1258 err = -EFAULT;
1259 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1260 goto done;
1261
1262 err = -EINVAL;
1263 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1264 goto done;
1265
1266 if (!(p.i_flags&GRE_KEY))
1267 p.i_key = 0;
1268 if (!(p.o_flags&GRE_KEY))
1269 p.o_key = 0;
1270
1271 ip6gre_tnl_parm_from_user(&p1, &p);
1272 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1273
1274 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1275 if (t) {
1276 if (t->dev != dev) {
1277 err = -EEXIST;
1278 break;
1279 }
1280 } else {
1281 t = netdev_priv(dev);
1282
1283 ip6gre_tunnel_unlink(ign, t);
1284 synchronize_net();
1285 ip6gre_tnl_change(t, &p1, 1);
1286 ip6gre_tunnel_link(ign, t);
1287 netdev_state_change(dev);
1288 }
1289 }
1290
1291 if (t) {
1292 err = 0;
1293
1294 memset(&p, 0, sizeof(p));
1295 ip6gre_tnl_parm_to_user(&p, &t->parms);
1296 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1297 err = -EFAULT;
1298 } else
1299 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1300 break;
1301
1302 case SIOCDELTUNNEL:
1303 err = -EPERM;
1304 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1305 goto done;
1306
1307 if (dev == ign->fb_tunnel_dev) {
1308 err = -EFAULT;
1309 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1310 goto done;
1311 err = -ENOENT;
1312 ip6gre_tnl_parm_from_user(&p1, &p);
1313 t = ip6gre_tunnel_locate(net, &p1, 0);
1314 if (!t)
1315 goto done;
1316 err = -EPERM;
1317 if (t == netdev_priv(ign->fb_tunnel_dev))
1318 goto done;
1319 dev = t->dev;
1320 }
1321 unregister_netdevice(dev);
1322 err = 0;
1323 break;
1324
1325 default:
1326 err = -EINVAL;
1327 }
1328
1329 done:
1330 return err;
1331 }
1332
1333 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1334 unsigned short type, const void *daddr,
1335 const void *saddr, unsigned int len)
1336 {
1337 struct ip6_tnl *t = netdev_priv(dev);
1338 struct ipv6hdr *ipv6h;
1339 __be16 *p;
1340
1341 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1342 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1343 t->fl.u.ip6.flowlabel,
1344 true, &t->fl.u.ip6));
1345 ipv6h->hop_limit = t->parms.hop_limit;
1346 ipv6h->nexthdr = NEXTHDR_GRE;
1347 ipv6h->saddr = t->parms.laddr;
1348 ipv6h->daddr = t->parms.raddr;
1349
1350 p = (__be16 *)(ipv6h + 1);
1351 p[0] = t->parms.o_flags;
1352 p[1] = htons(type);
1353
1354
1355
1356
1357
1358 if (saddr)
1359 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1360 if (daddr)
1361 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1362 if (!ipv6_addr_any(&ipv6h->daddr))
1363 return t->hlen;
1364
1365 return -t->hlen;
1366 }
1367
1368 static const struct header_ops ip6gre_header_ops = {
1369 .create = ip6gre_header,
1370 };
1371
1372 static const struct net_device_ops ip6gre_netdev_ops = {
1373 .ndo_init = ip6gre_tunnel_init,
1374 .ndo_uninit = ip6gre_tunnel_uninit,
1375 .ndo_start_xmit = ip6gre_tunnel_xmit,
1376 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1377 .ndo_change_mtu = ip6_tnl_change_mtu,
1378 .ndo_get_stats64 = ip_tunnel_get_stats64,
1379 .ndo_get_iflink = ip6_tnl_get_iflink,
1380 };
1381
1382 static void ip6gre_dev_free(struct net_device *dev)
1383 {
1384 struct ip6_tnl *t = netdev_priv(dev);
1385
1386 gro_cells_destroy(&t->gro_cells);
1387 dst_cache_destroy(&t->dst_cache);
1388 free_percpu(dev->tstats);
1389 }
1390
1391 static void ip6gre_tunnel_setup(struct net_device *dev)
1392 {
1393 dev->netdev_ops = &ip6gre_netdev_ops;
1394 dev->needs_free_netdev = true;
1395 dev->priv_destructor = ip6gre_dev_free;
1396
1397 dev->type = ARPHRD_IP6GRE;
1398
1399 dev->flags |= IFF_NOARP;
1400 dev->addr_len = sizeof(struct in6_addr);
1401 netif_keep_dst(dev);
1402
1403 dev->addr_assign_type = NET_ADDR_RANDOM;
1404 eth_random_addr(dev->perm_addr);
1405 }
1406
1407 #define GRE6_FEATURES (NETIF_F_SG | \
1408 NETIF_F_FRAGLIST | \
1409 NETIF_F_HIGHDMA | \
1410 NETIF_F_HW_CSUM)
1411
1412 static void ip6gre_tnl_init_features(struct net_device *dev)
1413 {
1414 struct ip6_tnl *nt = netdev_priv(dev);
1415
1416 dev->features |= GRE6_FEATURES;
1417 dev->hw_features |= GRE6_FEATURES;
1418
1419 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1420
1421
1422
1423
1424 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1425 nt->encap.type == TUNNEL_ENCAP_NONE) {
1426 dev->features |= NETIF_F_GSO_SOFTWARE;
1427 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1428 }
1429
1430
1431
1432
1433 dev->features |= NETIF_F_LLTX;
1434 }
1435 }
1436
1437 static int ip6gre_tunnel_init_common(struct net_device *dev)
1438 {
1439 struct ip6_tnl *tunnel;
1440 int ret;
1441 int t_hlen;
1442
1443 tunnel = netdev_priv(dev);
1444
1445 tunnel->dev = dev;
1446 tunnel->net = dev_net(dev);
1447 strcpy(tunnel->parms.name, dev->name);
1448
1449 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1450 if (!dev->tstats)
1451 return -ENOMEM;
1452
1453 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1454 if (ret)
1455 goto cleanup_alloc_pcpu_stats;
1456
1457 ret = gro_cells_init(&tunnel->gro_cells, dev);
1458 if (ret)
1459 goto cleanup_dst_cache_init;
1460
1461 t_hlen = ip6gre_calc_hlen(tunnel);
1462 dev->mtu = ETH_DATA_LEN - t_hlen;
1463 if (dev->type == ARPHRD_ETHER)
1464 dev->mtu -= ETH_HLEN;
1465 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1466 dev->mtu -= 8;
1467
1468 if (tunnel->parms.collect_md) {
1469 netif_keep_dst(dev);
1470 }
1471 ip6gre_tnl_init_features(dev);
1472
1473 return 0;
1474
1475 cleanup_dst_cache_init:
1476 dst_cache_destroy(&tunnel->dst_cache);
1477 cleanup_alloc_pcpu_stats:
1478 free_percpu(dev->tstats);
1479 dev->tstats = NULL;
1480 return ret;
1481 }
1482
1483 static int ip6gre_tunnel_init(struct net_device *dev)
1484 {
1485 struct ip6_tnl *tunnel;
1486 int ret;
1487
1488 ret = ip6gre_tunnel_init_common(dev);
1489 if (ret)
1490 return ret;
1491
1492 tunnel = netdev_priv(dev);
1493
1494 if (tunnel->parms.collect_md)
1495 return 0;
1496
1497 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1498 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1499
1500 if (ipv6_addr_any(&tunnel->parms.raddr))
1501 dev->header_ops = &ip6gre_header_ops;
1502
1503 return 0;
1504 }
1505
1506 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1507 {
1508 struct ip6_tnl *tunnel = netdev_priv(dev);
1509
1510 tunnel->dev = dev;
1511 tunnel->net = dev_net(dev);
1512 strcpy(tunnel->parms.name, dev->name);
1513
1514 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1515
1516 dev_hold(dev);
1517 }
1518
1519 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1520 .handler = gre_rcv,
1521 .err_handler = ip6gre_err,
1522 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1523 };
1524
1525 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1526 {
1527 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1528 struct net_device *dev, *aux;
1529 int prio;
1530
1531 for_each_netdev_safe(net, dev, aux)
1532 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1533 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1534 dev->rtnl_link_ops == &ip6erspan_tap_ops)
1535 unregister_netdevice_queue(dev, head);
1536
1537 for (prio = 0; prio < 4; prio++) {
1538 int h;
1539 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1540 struct ip6_tnl *t;
1541
1542 t = rtnl_dereference(ign->tunnels[prio][h]);
1543
1544 while (t) {
1545
1546
1547
1548 if (!net_eq(dev_net(t->dev), net))
1549 unregister_netdevice_queue(t->dev,
1550 head);
1551 t = rtnl_dereference(t->next);
1552 }
1553 }
1554 }
1555 }
1556
1557 static int __net_init ip6gre_init_net(struct net *net)
1558 {
1559 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1560 int err;
1561
1562 if (!net_has_fallback_tunnels(net))
1563 return 0;
1564 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1565 NET_NAME_UNKNOWN,
1566 ip6gre_tunnel_setup);
1567 if (!ign->fb_tunnel_dev) {
1568 err = -ENOMEM;
1569 goto err_alloc_dev;
1570 }
1571 dev_net_set(ign->fb_tunnel_dev, net);
1572
1573
1574
1575 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1576
1577
1578 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1579 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1580
1581 err = register_netdev(ign->fb_tunnel_dev);
1582 if (err)
1583 goto err_reg_dev;
1584
1585 rcu_assign_pointer(ign->tunnels_wc[0],
1586 netdev_priv(ign->fb_tunnel_dev));
1587 return 0;
1588
1589 err_reg_dev:
1590 free_netdev(ign->fb_tunnel_dev);
1591 err_alloc_dev:
1592 return err;
1593 }
1594
1595 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1596 {
1597 struct net *net;
1598 LIST_HEAD(list);
1599
1600 rtnl_lock();
1601 list_for_each_entry(net, net_list, exit_list)
1602 ip6gre_destroy_tunnels(net, &list);
1603 unregister_netdevice_many(&list);
1604 rtnl_unlock();
1605 }
1606
1607 static struct pernet_operations ip6gre_net_ops = {
1608 .init = ip6gre_init_net,
1609 .exit_batch = ip6gre_exit_batch_net,
1610 .id = &ip6gre_net_id,
1611 .size = sizeof(struct ip6gre_net),
1612 };
1613
1614 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1615 struct netlink_ext_ack *extack)
1616 {
1617 __be16 flags;
1618
1619 if (!data)
1620 return 0;
1621
1622 flags = 0;
1623 if (data[IFLA_GRE_IFLAGS])
1624 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1625 if (data[IFLA_GRE_OFLAGS])
1626 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1627 if (flags & (GRE_VERSION|GRE_ROUTING))
1628 return -EINVAL;
1629
1630 return 0;
1631 }
1632
1633 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1634 struct netlink_ext_ack *extack)
1635 {
1636 struct in6_addr daddr;
1637
1638 if (tb[IFLA_ADDRESS]) {
1639 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1640 return -EINVAL;
1641 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1642 return -EADDRNOTAVAIL;
1643 }
1644
1645 if (!data)
1646 goto out;
1647
1648 if (data[IFLA_GRE_REMOTE]) {
1649 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1650 if (ipv6_addr_any(&daddr))
1651 return -EINVAL;
1652 }
1653
1654 out:
1655 return ip6gre_tunnel_validate(tb, data, extack);
1656 }
1657
1658 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1659 struct netlink_ext_ack *extack)
1660 {
1661 __be16 flags = 0;
1662 int ret, ver = 0;
1663
1664 if (!data)
1665 return 0;
1666
1667 ret = ip6gre_tap_validate(tb, data, extack);
1668 if (ret)
1669 return ret;
1670
1671
1672 if (data[IFLA_GRE_OFLAGS])
1673 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1674 if (data[IFLA_GRE_IFLAGS])
1675 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1676 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1677 flags != (GRE_SEQ | GRE_KEY))
1678 return -EINVAL;
1679
1680
1681
1682
1683 if (data[IFLA_GRE_IKEY] &&
1684 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1685 return -EINVAL;
1686
1687 if (data[IFLA_GRE_OKEY] &&
1688 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1689 return -EINVAL;
1690
1691 if (data[IFLA_GRE_ERSPAN_VER]) {
1692 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1693 if (ver != 1 && ver != 2)
1694 return -EINVAL;
1695 }
1696
1697 if (ver == 1) {
1698 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1699 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1700
1701 if (index & ~INDEX_MASK)
1702 return -EINVAL;
1703 }
1704 } else if (ver == 2) {
1705 if (data[IFLA_GRE_ERSPAN_DIR]) {
1706 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1707
1708 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1709 return -EINVAL;
1710 }
1711
1712 if (data[IFLA_GRE_ERSPAN_HWID]) {
1713 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1714
1715 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1716 return -EINVAL;
1717 }
1718 }
1719
1720 return 0;
1721 }
1722
1723 static void ip6erspan_set_version(struct nlattr *data[],
1724 struct __ip6_tnl_parm *parms)
1725 {
1726 if (!data)
1727 return;
1728
1729 parms->erspan_ver = 1;
1730 if (data[IFLA_GRE_ERSPAN_VER])
1731 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1732
1733 if (parms->erspan_ver == 1) {
1734 if (data[IFLA_GRE_ERSPAN_INDEX])
1735 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1736 } else if (parms->erspan_ver == 2) {
1737 if (data[IFLA_GRE_ERSPAN_DIR])
1738 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1739 if (data[IFLA_GRE_ERSPAN_HWID])
1740 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1741 }
1742 }
1743
1744 static void ip6gre_netlink_parms(struct nlattr *data[],
1745 struct __ip6_tnl_parm *parms)
1746 {
1747 memset(parms, 0, sizeof(*parms));
1748
1749 if (!data)
1750 return;
1751
1752 if (data[IFLA_GRE_LINK])
1753 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1754
1755 if (data[IFLA_GRE_IFLAGS])
1756 parms->i_flags = gre_flags_to_tnl_flags(
1757 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1758
1759 if (data[IFLA_GRE_OFLAGS])
1760 parms->o_flags = gre_flags_to_tnl_flags(
1761 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1762
1763 if (data[IFLA_GRE_IKEY])
1764 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1765
1766 if (data[IFLA_GRE_OKEY])
1767 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1768
1769 if (data[IFLA_GRE_LOCAL])
1770 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1771
1772 if (data[IFLA_GRE_REMOTE])
1773 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1774
1775 if (data[IFLA_GRE_TTL])
1776 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1777
1778 if (data[IFLA_GRE_ENCAP_LIMIT])
1779 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1780
1781 if (data[IFLA_GRE_FLOWINFO])
1782 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1783
1784 if (data[IFLA_GRE_FLAGS])
1785 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1786
1787 if (data[IFLA_GRE_FWMARK])
1788 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1789
1790 if (data[IFLA_GRE_COLLECT_METADATA])
1791 parms->collect_md = true;
1792 }
1793
1794 static int ip6gre_tap_init(struct net_device *dev)
1795 {
1796 int ret;
1797
1798 ret = ip6gre_tunnel_init_common(dev);
1799 if (ret)
1800 return ret;
1801
1802 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1803
1804 return 0;
1805 }
1806
1807 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1808 .ndo_init = ip6gre_tap_init,
1809 .ndo_uninit = ip6gre_tunnel_uninit,
1810 .ndo_start_xmit = ip6gre_tunnel_xmit,
1811 .ndo_set_mac_address = eth_mac_addr,
1812 .ndo_validate_addr = eth_validate_addr,
1813 .ndo_change_mtu = ip6_tnl_change_mtu,
1814 .ndo_get_stats64 = ip_tunnel_get_stats64,
1815 .ndo_get_iflink = ip6_tnl_get_iflink,
1816 };
1817
1818 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1819 {
1820 int t_hlen;
1821
1822 tunnel->tun_hlen = 8;
1823 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1824 erspan_hdr_len(tunnel->parms.erspan_ver);
1825
1826 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1827 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1828 return t_hlen;
1829 }
1830
1831 static int ip6erspan_tap_init(struct net_device *dev)
1832 {
1833 struct ip6_tnl *tunnel;
1834 int t_hlen;
1835 int ret;
1836
1837 tunnel = netdev_priv(dev);
1838
1839 tunnel->dev = dev;
1840 tunnel->net = dev_net(dev);
1841 strcpy(tunnel->parms.name, dev->name);
1842
1843 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1844 if (!dev->tstats)
1845 return -ENOMEM;
1846
1847 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1848 if (ret)
1849 goto cleanup_alloc_pcpu_stats;
1850
1851 ret = gro_cells_init(&tunnel->gro_cells, dev);
1852 if (ret)
1853 goto cleanup_dst_cache_init;
1854
1855 t_hlen = ip6erspan_calc_hlen(tunnel);
1856 dev->mtu = ETH_DATA_LEN - t_hlen;
1857 if (dev->type == ARPHRD_ETHER)
1858 dev->mtu -= ETH_HLEN;
1859 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1860 dev->mtu -= 8;
1861
1862 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1863 ip6erspan_tnl_link_config(tunnel, 1);
1864
1865 return 0;
1866
1867 cleanup_dst_cache_init:
1868 dst_cache_destroy(&tunnel->dst_cache);
1869 cleanup_alloc_pcpu_stats:
1870 free_percpu(dev->tstats);
1871 dev->tstats = NULL;
1872 return ret;
1873 }
1874
1875 static const struct net_device_ops ip6erspan_netdev_ops = {
1876 .ndo_init = ip6erspan_tap_init,
1877 .ndo_uninit = ip6erspan_tunnel_uninit,
1878 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1879 .ndo_set_mac_address = eth_mac_addr,
1880 .ndo_validate_addr = eth_validate_addr,
1881 .ndo_change_mtu = ip6_tnl_change_mtu,
1882 .ndo_get_stats64 = ip_tunnel_get_stats64,
1883 .ndo_get_iflink = ip6_tnl_get_iflink,
1884 };
1885
1886 static void ip6gre_tap_setup(struct net_device *dev)
1887 {
1888
1889 ether_setup(dev);
1890
1891 dev->max_mtu = 0;
1892 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1893 dev->needs_free_netdev = true;
1894 dev->priv_destructor = ip6gre_dev_free;
1895
1896 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1897 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1898 netif_keep_dst(dev);
1899 }
1900
1901 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1902 struct ip_tunnel_encap *ipencap)
1903 {
1904 bool ret = false;
1905
1906 memset(ipencap, 0, sizeof(*ipencap));
1907
1908 if (!data)
1909 return ret;
1910
1911 if (data[IFLA_GRE_ENCAP_TYPE]) {
1912 ret = true;
1913 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1914 }
1915
1916 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1917 ret = true;
1918 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1919 }
1920
1921 if (data[IFLA_GRE_ENCAP_SPORT]) {
1922 ret = true;
1923 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1924 }
1925
1926 if (data[IFLA_GRE_ENCAP_DPORT]) {
1927 ret = true;
1928 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1929 }
1930
1931 return ret;
1932 }
1933
1934 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1935 struct nlattr *tb[], struct nlattr *data[],
1936 struct netlink_ext_ack *extack)
1937 {
1938 struct ip6_tnl *nt;
1939 struct ip_tunnel_encap ipencap;
1940 int err;
1941
1942 nt = netdev_priv(dev);
1943
1944 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1945 int err = ip6_tnl_encap_setup(nt, &ipencap);
1946
1947 if (err < 0)
1948 return err;
1949 }
1950
1951 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1952 eth_hw_addr_random(dev);
1953
1954 nt->dev = dev;
1955 nt->net = dev_net(dev);
1956
1957 err = register_netdevice(dev);
1958 if (err)
1959 goto out;
1960
1961 if (tb[IFLA_MTU])
1962 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1963
1964 dev_hold(dev);
1965
1966 out:
1967 return err;
1968 }
1969
1970 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1971 struct nlattr *tb[], struct nlattr *data[],
1972 struct netlink_ext_ack *extack)
1973 {
1974 struct ip6_tnl *nt = netdev_priv(dev);
1975 struct net *net = dev_net(dev);
1976 struct ip6gre_net *ign;
1977 int err;
1978
1979 ip6gre_netlink_parms(data, &nt->parms);
1980 ign = net_generic(net, ip6gre_net_id);
1981
1982 if (nt->parms.collect_md) {
1983 if (rtnl_dereference(ign->collect_md_tun))
1984 return -EEXIST;
1985 } else {
1986 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1987 return -EEXIST;
1988 }
1989
1990 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
1991 if (!err) {
1992 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1993 ip6gre_tunnel_link_md(ign, nt);
1994 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
1995 }
1996 return err;
1997 }
1998
1999 static struct ip6_tnl *
2000 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2001 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2002 struct netlink_ext_ack *extack)
2003 {
2004 struct ip6_tnl *t, *nt = netdev_priv(dev);
2005 struct net *net = nt->net;
2006 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2007 struct ip_tunnel_encap ipencap;
2008
2009 if (dev == ign->fb_tunnel_dev)
2010 return ERR_PTR(-EINVAL);
2011
2012 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2013 int err = ip6_tnl_encap_setup(nt, &ipencap);
2014
2015 if (err < 0)
2016 return ERR_PTR(err);
2017 }
2018
2019 ip6gre_netlink_parms(data, p_p);
2020
2021 t = ip6gre_tunnel_locate(net, p_p, 0);
2022
2023 if (t) {
2024 if (t->dev != dev)
2025 return ERR_PTR(-EEXIST);
2026 } else {
2027 t = nt;
2028 }
2029
2030 return t;
2031 }
2032
2033 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2034 struct nlattr *data[],
2035 struct netlink_ext_ack *extack)
2036 {
2037 struct ip6_tnl *t = netdev_priv(dev);
2038 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2039 struct __ip6_tnl_parm p;
2040
2041 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2042 if (IS_ERR(t))
2043 return PTR_ERR(t);
2044
2045 ip6gre_tunnel_unlink_md(ign, t);
2046 ip6gre_tunnel_unlink(ign, t);
2047 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2048 ip6gre_tunnel_link_md(ign, t);
2049 ip6gre_tunnel_link(ign, t);
2050 return 0;
2051 }
2052
2053 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2054 {
2055 struct net *net = dev_net(dev);
2056 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2057
2058 if (dev != ign->fb_tunnel_dev)
2059 unregister_netdevice_queue(dev, head);
2060 }
2061
2062 static size_t ip6gre_get_size(const struct net_device *dev)
2063 {
2064 return
2065
2066 nla_total_size(4) +
2067
2068 nla_total_size(2) +
2069
2070 nla_total_size(2) +
2071
2072 nla_total_size(4) +
2073
2074 nla_total_size(4) +
2075
2076 nla_total_size(sizeof(struct in6_addr)) +
2077
2078 nla_total_size(sizeof(struct in6_addr)) +
2079
2080 nla_total_size(1) +
2081
2082 nla_total_size(1) +
2083
2084 nla_total_size(4) +
2085
2086 nla_total_size(4) +
2087
2088 nla_total_size(2) +
2089
2090 nla_total_size(2) +
2091
2092 nla_total_size(2) +
2093
2094 nla_total_size(2) +
2095
2096 nla_total_size(0) +
2097
2098 nla_total_size(4) +
2099
2100 nla_total_size(4) +
2101 0;
2102 }
2103
2104 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2105 {
2106 struct ip6_tnl *t = netdev_priv(dev);
2107 struct __ip6_tnl_parm *p = &t->parms;
2108 __be16 o_flags = p->o_flags;
2109
2110 if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2111 if (!p->collect_md)
2112 o_flags |= TUNNEL_KEY;
2113
2114 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2115 goto nla_put_failure;
2116
2117 if (p->erspan_ver == 1) {
2118 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2119 goto nla_put_failure;
2120 } else {
2121 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2122 goto nla_put_failure;
2123 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2124 goto nla_put_failure;
2125 }
2126 }
2127
2128 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2129 nla_put_be16(skb, IFLA_GRE_IFLAGS,
2130 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2131 nla_put_be16(skb, IFLA_GRE_OFLAGS,
2132 gre_tnl_flags_to_gre_flags(o_flags)) ||
2133 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2134 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2135 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2136 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2137 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2138 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2139 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2140 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2141 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
2142 goto nla_put_failure;
2143
2144 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2145 t->encap.type) ||
2146 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2147 t->encap.sport) ||
2148 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2149 t->encap.dport) ||
2150 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2151 t->encap.flags))
2152 goto nla_put_failure;
2153
2154 if (p->collect_md) {
2155 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2156 goto nla_put_failure;
2157 }
2158
2159 return 0;
2160
2161 nla_put_failure:
2162 return -EMSGSIZE;
2163 }
2164
2165 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2166 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2167 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2168 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2169 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2170 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2171 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
2172 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
2173 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2174 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2175 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2176 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
2177 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2178 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2179 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2180 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
2181 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2182 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
2183 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2184 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2185 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2186 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
2187 };
2188
2189 static void ip6erspan_tap_setup(struct net_device *dev)
2190 {
2191 ether_setup(dev);
2192
2193 dev->max_mtu = 0;
2194 dev->netdev_ops = &ip6erspan_netdev_ops;
2195 dev->needs_free_netdev = true;
2196 dev->priv_destructor = ip6gre_dev_free;
2197
2198 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2199 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2200 netif_keep_dst(dev);
2201 }
2202
2203 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2204 struct nlattr *tb[], struct nlattr *data[],
2205 struct netlink_ext_ack *extack)
2206 {
2207 struct ip6_tnl *nt = netdev_priv(dev);
2208 struct net *net = dev_net(dev);
2209 struct ip6gre_net *ign;
2210 int err;
2211
2212 ip6gre_netlink_parms(data, &nt->parms);
2213 ip6erspan_set_version(data, &nt->parms);
2214 ign = net_generic(net, ip6gre_net_id);
2215
2216 if (nt->parms.collect_md) {
2217 if (rtnl_dereference(ign->collect_md_tun_erspan))
2218 return -EEXIST;
2219 } else {
2220 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2221 return -EEXIST;
2222 }
2223
2224 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2225 if (!err) {
2226 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2227 ip6erspan_tunnel_link_md(ign, nt);
2228 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2229 }
2230 return err;
2231 }
2232
2233 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2234 {
2235 ip6gre_tnl_link_config_common(t);
2236 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2237 }
2238
2239 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2240 const struct __ip6_tnl_parm *p, int set_mtu)
2241 {
2242 ip6gre_tnl_copy_tnl_parm(t, p);
2243 ip6erspan_tnl_link_config(t, set_mtu);
2244 return 0;
2245 }
2246
2247 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2248 struct nlattr *data[],
2249 struct netlink_ext_ack *extack)
2250 {
2251 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2252 struct __ip6_tnl_parm p;
2253 struct ip6_tnl *t;
2254
2255 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2256 if (IS_ERR(t))
2257 return PTR_ERR(t);
2258
2259 ip6erspan_set_version(data, &p);
2260 ip6gre_tunnel_unlink_md(ign, t);
2261 ip6gre_tunnel_unlink(ign, t);
2262 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2263 ip6erspan_tunnel_link_md(ign, t);
2264 ip6gre_tunnel_link(ign, t);
2265 return 0;
2266 }
2267
2268 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2269 .kind = "ip6gre",
2270 .maxtype = IFLA_GRE_MAX,
2271 .policy = ip6gre_policy,
2272 .priv_size = sizeof(struct ip6_tnl),
2273 .setup = ip6gre_tunnel_setup,
2274 .validate = ip6gre_tunnel_validate,
2275 .newlink = ip6gre_newlink,
2276 .changelink = ip6gre_changelink,
2277 .dellink = ip6gre_dellink,
2278 .get_size = ip6gre_get_size,
2279 .fill_info = ip6gre_fill_info,
2280 .get_link_net = ip6_tnl_get_link_net,
2281 };
2282
2283 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2284 .kind = "ip6gretap",
2285 .maxtype = IFLA_GRE_MAX,
2286 .policy = ip6gre_policy,
2287 .priv_size = sizeof(struct ip6_tnl),
2288 .setup = ip6gre_tap_setup,
2289 .validate = ip6gre_tap_validate,
2290 .newlink = ip6gre_newlink,
2291 .changelink = ip6gre_changelink,
2292 .get_size = ip6gre_get_size,
2293 .fill_info = ip6gre_fill_info,
2294 .get_link_net = ip6_tnl_get_link_net,
2295 };
2296
2297 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2298 .kind = "ip6erspan",
2299 .maxtype = IFLA_GRE_MAX,
2300 .policy = ip6gre_policy,
2301 .priv_size = sizeof(struct ip6_tnl),
2302 .setup = ip6erspan_tap_setup,
2303 .validate = ip6erspan_tap_validate,
2304 .newlink = ip6erspan_newlink,
2305 .changelink = ip6erspan_changelink,
2306 .get_size = ip6gre_get_size,
2307 .fill_info = ip6gre_fill_info,
2308 .get_link_net = ip6_tnl_get_link_net,
2309 };
2310
2311
2312
2313
2314
2315 static int __init ip6gre_init(void)
2316 {
2317 int err;
2318
2319 pr_info("GRE over IPv6 tunneling driver\n");
2320
2321 err = register_pernet_device(&ip6gre_net_ops);
2322 if (err < 0)
2323 return err;
2324
2325 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2326 if (err < 0) {
2327 pr_info("%s: can't add protocol\n", __func__);
2328 goto add_proto_failed;
2329 }
2330
2331 err = rtnl_link_register(&ip6gre_link_ops);
2332 if (err < 0)
2333 goto rtnl_link_failed;
2334
2335 err = rtnl_link_register(&ip6gre_tap_ops);
2336 if (err < 0)
2337 goto tap_ops_failed;
2338
2339 err = rtnl_link_register(&ip6erspan_tap_ops);
2340 if (err < 0)
2341 goto erspan_link_failed;
2342
2343 out:
2344 return err;
2345
2346 erspan_link_failed:
2347 rtnl_link_unregister(&ip6gre_tap_ops);
2348 tap_ops_failed:
2349 rtnl_link_unregister(&ip6gre_link_ops);
2350 rtnl_link_failed:
2351 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2352 add_proto_failed:
2353 unregister_pernet_device(&ip6gre_net_ops);
2354 goto out;
2355 }
2356
2357 static void __exit ip6gre_fini(void)
2358 {
2359 rtnl_link_unregister(&ip6gre_tap_ops);
2360 rtnl_link_unregister(&ip6gre_link_ops);
2361 rtnl_link_unregister(&ip6erspan_tap_ops);
2362 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2363 unregister_pernet_device(&ip6gre_net_ops);
2364 }
2365
2366 module_init(ip6gre_init);
2367 module_exit(ip6gre_fini);
2368 MODULE_LICENSE("GPL");
2369 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2370 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2371 MODULE_ALIAS_RTNL_LINK("ip6gre");
2372 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2373 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2374 MODULE_ALIAS_NETDEV("ip6gre0");