1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * GRE over IPv6 protocol decoder.
4 *
5 * Authors: Dmitry Kozlov (xeb@mail.ru)
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/netdev_lock.h>
47 #include <net/rtnetlink.h>
48
49 #include <net/ipv6.h>
50 #include <net/ip6_fib.h>
51 #include <net/ip6_route.h>
52 #include <net/ip6_tunnel.h>
53 #include <net/gre.h>
54 #include <net/erspan.h>
55 #include <net/dst_metadata.h>
56
57
58 static bool log_ecn_error = true;
59 module_param(log_ecn_error, bool, 0644);
60 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
61
62 #define IP6_GRE_HASH_SIZE_SHIFT 5
63 #define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
64
65 static unsigned int ip6gre_net_id __read_mostly;
66 struct ip6gre_net {
67 struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
68
69 struct ip6_tnl __rcu *collect_md_tun;
70 struct ip6_tnl __rcu *collect_md_tun_erspan;
71 struct net_device *fb_tunnel_dev;
72 };
73
74 static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
75 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
76 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly;
77 static int ip6gre_tunnel_init(struct net_device *dev);
78 static void ip6gre_tunnel_setup(struct net_device *dev);
79 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
80 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
81 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu);
82
83 /* Tunnel hash table */
84
85 /*
86 4 hash tables:
87
88 3: (remote,local)
89 2: (remote,*)
90 1: (*,local)
91 0: (*,*)
92
93 We require exact key match i.e. if a key is present in packet
94 it will match only tunnel with the same key; if it is not present,
95 it will match only keyless tunnel.
96
97 All keysless packets, if not matched configured keyless tunnels
98 will match fallback tunnel.
99 */
100
101 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
HASH_ADDR(const struct in6_addr * addr)102 static u32 HASH_ADDR(const struct in6_addr *addr)
103 {
104 u32 hash = ipv6_addr_hash(addr);
105
106 return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
107 }
108
109 #define tunnels_r_l tunnels[3]
110 #define tunnels_r tunnels[2]
111 #define tunnels_l tunnels[1]
112 #define tunnels_wc tunnels[0]
113
114 /* Given src, dst and key, find appropriate for input tunnel. */
115
ip6gre_tunnel_lookup(struct net_device * dev,const struct in6_addr * remote,const struct in6_addr * local,__be32 key,__be16 gre_proto)116 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
117 const struct in6_addr *remote, const struct in6_addr *local,
118 __be32 key, __be16 gre_proto)
119 {
120 struct net *net = dev_net(dev);
121 int link = dev->ifindex;
122 unsigned int h0 = HASH_ADDR(remote);
123 unsigned int h1 = HASH_KEY(key);
124 struct ip6_tnl *t, *cand = NULL;
125 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
126 int dev_type = (gre_proto == htons(ETH_P_TEB) ||
127 gre_proto == htons(ETH_P_ERSPAN) ||
128 gre_proto == htons(ETH_P_ERSPAN2)) ?
129 ARPHRD_ETHER : ARPHRD_IP6GRE;
130 int score, cand_score = 4;
131 struct net_device *ndev;
132
133 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
134 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
135 !ipv6_addr_equal(remote, &t->parms.raddr) ||
136 key != t->parms.i_key ||
137 !(t->dev->flags & IFF_UP))
138 continue;
139
140 if (t->dev->type != ARPHRD_IP6GRE &&
141 t->dev->type != dev_type)
142 continue;
143
144 score = 0;
145 if (t->parms.link != link)
146 score |= 1;
147 if (t->dev->type != dev_type)
148 score |= 2;
149 if (score == 0)
150 return t;
151
152 if (score < cand_score) {
153 cand = t;
154 cand_score = score;
155 }
156 }
157
158 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
159 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
160 key != t->parms.i_key ||
161 !(t->dev->flags & IFF_UP))
162 continue;
163
164 if (t->dev->type != ARPHRD_IP6GRE &&
165 t->dev->type != dev_type)
166 continue;
167
168 score = 0;
169 if (t->parms.link != link)
170 score |= 1;
171 if (t->dev->type != dev_type)
172 score |= 2;
173 if (score == 0)
174 return t;
175
176 if (score < cand_score) {
177 cand = t;
178 cand_score = score;
179 }
180 }
181
182 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
183 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
184 (!ipv6_addr_equal(local, &t->parms.raddr) ||
185 !ipv6_addr_is_multicast(local))) ||
186 key != t->parms.i_key ||
187 !(t->dev->flags & IFF_UP))
188 continue;
189
190 if (t->dev->type != ARPHRD_IP6GRE &&
191 t->dev->type != dev_type)
192 continue;
193
194 score = 0;
195 if (t->parms.link != link)
196 score |= 1;
197 if (t->dev->type != dev_type)
198 score |= 2;
199 if (score == 0)
200 return t;
201
202 if (score < cand_score) {
203 cand = t;
204 cand_score = score;
205 }
206 }
207
208 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
209 if (t->parms.i_key != key ||
210 !(t->dev->flags & IFF_UP))
211 continue;
212
213 if (t->dev->type != ARPHRD_IP6GRE &&
214 t->dev->type != dev_type)
215 continue;
216
217 score = 0;
218 if (t->parms.link != link)
219 score |= 1;
220 if (t->dev->type != dev_type)
221 score |= 2;
222 if (score == 0)
223 return t;
224
225 if (score < cand_score) {
226 cand = t;
227 cand_score = score;
228 }
229 }
230
231 if (cand)
232 return cand;
233
234 if (gre_proto == htons(ETH_P_ERSPAN) ||
235 gre_proto == htons(ETH_P_ERSPAN2))
236 t = rcu_dereference(ign->collect_md_tun_erspan);
237 else
238 t = rcu_dereference(ign->collect_md_tun);
239
240 if (t && t->dev->flags & IFF_UP)
241 return t;
242
243 ndev = READ_ONCE(ign->fb_tunnel_dev);
244 if (ndev && ndev->flags & IFF_UP)
245 return netdev_priv(ndev);
246
247 return NULL;
248 }
249
__ip6gre_bucket(struct ip6gre_net * ign,const struct __ip6_tnl_parm * p)250 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
251 const struct __ip6_tnl_parm *p)
252 {
253 const struct in6_addr *remote = &p->raddr;
254 const struct in6_addr *local = &p->laddr;
255 unsigned int h = HASH_KEY(p->i_key);
256 int prio = 0;
257
258 if (!ipv6_addr_any(local))
259 prio |= 1;
260 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
261 prio |= 2;
262 h ^= HASH_ADDR(remote);
263 }
264
265 return &ign->tunnels[prio][h];
266 }
267
ip6gre_tunnel_link_md(struct ip6gre_net * ign,struct ip6_tnl * t)268 static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
269 {
270 if (t->parms.collect_md)
271 rcu_assign_pointer(ign->collect_md_tun, t);
272 }
273
ip6erspan_tunnel_link_md(struct ip6gre_net * ign,struct ip6_tnl * t)274 static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
275 {
276 if (t->parms.collect_md)
277 rcu_assign_pointer(ign->collect_md_tun_erspan, t);
278 }
279
ip6gre_tunnel_unlink_md(struct ip6gre_net * ign,struct ip6_tnl * t)280 static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t)
281 {
282 if (t->parms.collect_md)
283 rcu_assign_pointer(ign->collect_md_tun, NULL);
284 }
285
ip6erspan_tunnel_unlink_md(struct ip6gre_net * ign,struct ip6_tnl * t)286 static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign,
287 struct ip6_tnl *t)
288 {
289 if (t->parms.collect_md)
290 rcu_assign_pointer(ign->collect_md_tun_erspan, NULL);
291 }
292
ip6gre_bucket(struct ip6gre_net * ign,const struct ip6_tnl * t)293 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
294 const struct ip6_tnl *t)
295 {
296 return __ip6gre_bucket(ign, &t->parms);
297 }
298
ip6gre_tunnel_link(struct ip6gre_net * ign,struct ip6_tnl * t)299 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
300 {
301 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
302
303 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
304 rcu_assign_pointer(*tp, t);
305 }
306
ip6gre_tunnel_unlink(struct ip6gre_net * ign,struct ip6_tnl * t)307 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
308 {
309 struct ip6_tnl __rcu **tp;
310 struct ip6_tnl *iter;
311
312 for (tp = ip6gre_bucket(ign, t);
313 (iter = rtnl_dereference(*tp)) != NULL;
314 tp = &iter->next) {
315 if (t == iter) {
316 rcu_assign_pointer(*tp, t->next);
317 break;
318 }
319 }
320 }
321
ip6gre_tunnel_find(struct net * net,const struct __ip6_tnl_parm * parms,int type)322 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
323 const struct __ip6_tnl_parm *parms,
324 int type)
325 {
326 const struct in6_addr *remote = &parms->raddr;
327 const struct in6_addr *local = &parms->laddr;
328 __be32 key = parms->i_key;
329 int link = parms->link;
330 struct ip6_tnl *t;
331 struct ip6_tnl __rcu **tp;
332 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
333
334 for (tp = __ip6gre_bucket(ign, parms);
335 (t = rtnl_dereference(*tp)) != NULL;
336 tp = &t->next)
337 if (ipv6_addr_equal(local, &t->parms.laddr) &&
338 ipv6_addr_equal(remote, &t->parms.raddr) &&
339 key == t->parms.i_key &&
340 link == t->parms.link &&
341 type == t->dev->type)
342 break;
343
344 return t;
345 }
346
ip6gre_tunnel_locate(struct net * net,const struct __ip6_tnl_parm * parms,int create)347 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
348 const struct __ip6_tnl_parm *parms, int create)
349 {
350 struct ip6_tnl *t, *nt;
351 struct net_device *dev;
352 char name[IFNAMSIZ];
353 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
354
355 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
356 if (t && create)
357 return NULL;
358 if (t || !create)
359 return t;
360
361 if (parms->name[0]) {
362 if (!dev_valid_name(parms->name))
363 return NULL;
364 strscpy(name, parms->name, IFNAMSIZ);
365 } else {
366 strcpy(name, "ip6gre%d");
367 }
368 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
369 ip6gre_tunnel_setup);
370 if (!dev)
371 return NULL;
372
373 dev_net_set(dev, net);
374
375 nt = netdev_priv(dev);
376 nt->parms = *parms;
377 dev->rtnl_link_ops = &ip6gre_link_ops;
378
379 nt->dev = dev;
380 nt->net = dev_net(dev);
381
382 if (register_netdevice(dev) < 0)
383 goto failed_free;
384
385 ip6gre_tnl_link_config(nt, 1);
386 ip6gre_tunnel_link(ign, nt);
387 return nt;
388
389 failed_free:
390 free_netdev(dev);
391 return NULL;
392 }
393
ip6erspan_tunnel_uninit(struct net_device * dev)394 static void ip6erspan_tunnel_uninit(struct net_device *dev)
395 {
396 struct ip6_tnl *t = netdev_priv(dev);
397 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
398
399 ip6erspan_tunnel_unlink_md(ign, t);
400 ip6gre_tunnel_unlink(ign, t);
401 dst_cache_reset(&t->dst_cache);
402 netdev_put(dev, &t->dev_tracker);
403 }
404
ip6gre_tunnel_uninit(struct net_device * dev)405 static void ip6gre_tunnel_uninit(struct net_device *dev)
406 {
407 struct ip6_tnl *t = netdev_priv(dev);
408 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
409
410 ip6gre_tunnel_unlink_md(ign, t);
411 ip6gre_tunnel_unlink(ign, t);
412 if (ign->fb_tunnel_dev == dev)
413 WRITE_ONCE(ign->fb_tunnel_dev, NULL);
414 dst_cache_reset(&t->dst_cache);
415 netdev_put(dev, &t->dev_tracker);
416 }
417
418
ip6gre_err(struct sk_buff * skb,struct inet6_skb_parm * opt,u8 type,u8 code,int offset,__be32 info)419 static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
420 u8 type, u8 code, int offset, __be32 info)
421 {
422 struct net *net = dev_net(skb->dev);
423 const struct ipv6hdr *ipv6h;
424 struct tnl_ptk_info tpi;
425 struct ip6_tnl *t;
426
427 if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6),
428 offset) < 0)
429 return -EINVAL;
430
431 ipv6h = (const struct ipv6hdr *)skb->data;
432 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
433 tpi.key, tpi.proto);
434 if (!t)
435 return -ENOENT;
436
437 switch (type) {
438 case ICMPV6_DEST_UNREACH:
439 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
440 t->parms.name);
441 if (code != ICMPV6_PORT_UNREACH)
442 break;
443 return 0;
444 case ICMPV6_TIME_EXCEED:
445 if (code == ICMPV6_EXC_HOPLIMIT) {
446 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
447 t->parms.name);
448 break;
449 }
450 return 0;
451 case ICMPV6_PARAMPROB: {
452 struct ipv6_tlv_tnl_enc_lim *tel;
453 __u32 teli;
454
455 teli = 0;
456 if (code == ICMPV6_HDR_FIELD)
457 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
458
459 if (teli && teli == be32_to_cpu(info) - 2) {
460 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
461 if (tel->encap_limit == 0) {
462 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
463 t->parms.name);
464 }
465 } else {
466 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
467 t->parms.name);
468 }
469 return 0;
470 }
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
ip6gre_rcv(struct sk_buff * skb,const struct tnl_ptk_info * tpi)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 IP_TUNNEL_DECLARE_FLAGS(flags);
501 struct metadata_dst *tun_dst;
502 __be64 tun_id;
503
504 ip_tunnel_flags_copy(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
ip6erspan_rcv(struct sk_buff * skb,struct tnl_ptk_info * tpi,int gre_hdr_len)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 if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr))))
533 return PACKET_REJECT;
534
535 ipv6h = ipv6_hdr(skb);
536 ershdr = (struct erspan_base_hdr *)skb->data;
537 ver = ershdr->ver;
538
539 tunnel = ip6gre_tunnel_lookup(skb->dev,
540 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
541 tpi->proto);
542 if (tunnel) {
543 int len = erspan_hdr_len(ver);
544
545 if (unlikely(!pskb_may_pull(skb, len)))
546 return PACKET_REJECT;
547
548 if (__iptunnel_pull_header(skb, len,
549 htons(ETH_P_TEB),
550 false, false) < 0)
551 return PACKET_REJECT;
552
553 if (tunnel->parms.collect_md) {
554 struct erspan_metadata *pkt_md, *md;
555 IP_TUNNEL_DECLARE_FLAGS(flags);
556 struct metadata_dst *tun_dst;
557 struct ip_tunnel_info *info;
558 unsigned char *gh;
559 __be64 tun_id;
560
561 __set_bit(IP_TUNNEL_KEY_BIT, tpi->flags);
562 ip_tunnel_flags_copy(flags, tpi->flags);
563 tun_id = key32_to_tunnel_id(tpi->key);
564
565 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
566 sizeof(*md));
567 if (!tun_dst)
568 return PACKET_REJECT;
569
570 /* skb can be uncloned in __iptunnel_pull_header, so
571 * old pkt_md is no longer valid and we need to reset
572 * it
573 */
574 gh = skb_network_header(skb) +
575 skb_network_header_len(skb);
576 pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len +
577 sizeof(*ershdr));
578 info = &tun_dst->u.tun_info;
579 md = ip_tunnel_info_opts(info);
580 md->version = ver;
581 md2 = &md->u.md2;
582 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
583 ERSPAN_V2_MDSIZE);
584 __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT,
585 info->key.tun_flags);
586 info->options_len = sizeof(*md);
587
588 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
589
590 } else {
591 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
592 }
593
594 return PACKET_RCVD;
595 }
596
597 return PACKET_REJECT;
598 }
599
gre_rcv(struct sk_buff * skb)600 static int gre_rcv(struct sk_buff *skb)
601 {
602 struct tnl_ptk_info tpi;
603 bool csum_err = false;
604 int hdr_len;
605
606 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
607 if (hdr_len < 0)
608 goto drop;
609
610 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
611 goto drop;
612
613 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
614 tpi.proto == htons(ETH_P_ERSPAN2))) {
615 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
616 return 0;
617 goto out;
618 }
619
620 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
621 return 0;
622
623 out:
624 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
625 drop:
626 kfree_skb(skb);
627 return 0;
628 }
629
gre_handle_offloads(struct sk_buff * skb,bool csum)630 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
631 {
632 return iptunnel_handle_offloads(skb,
633 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
634 }
635
prepare_ip6gre_xmit_ipv4(struct sk_buff * skb,struct net_device * dev,struct flowi6 * fl6,__u8 * dsfield,int * encap_limit)636 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
637 struct net_device *dev,
638 struct flowi6 *fl6, __u8 *dsfield,
639 int *encap_limit)
640 {
641 const struct iphdr *iph = ip_hdr(skb);
642 struct ip6_tnl *t = netdev_priv(dev);
643
644 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
645 *encap_limit = t->parms.encap_limit;
646
647 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
648
649 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
650 *dsfield = ipv4_get_dsfield(iph);
651 else
652 *dsfield = ip6_tclass(t->parms.flowinfo);
653
654 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
655 fl6->flowi6_mark = skb->mark;
656 else
657 fl6->flowi6_mark = t->parms.fwmark;
658
659 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
660 }
661
prepare_ip6gre_xmit_ipv6(struct sk_buff * skb,struct net_device * dev,struct flowi6 * fl6,__u8 * dsfield,int * encap_limit)662 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
663 struct net_device *dev,
664 struct flowi6 *fl6, __u8 *dsfield,
665 int *encap_limit)
666 {
667 struct ipv6hdr *ipv6h;
668 struct ip6_tnl *t = netdev_priv(dev);
669 __u16 offset;
670
671 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
672 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
673 ipv6h = ipv6_hdr(skb);
674
675 if (offset > 0) {
676 struct ipv6_tlv_tnl_enc_lim *tel;
677
678 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
679 if (tel->encap_limit == 0) {
680 icmpv6_ndo_send(skb, ICMPV6_PARAMPROB,
681 ICMPV6_HDR_FIELD, offset + 2);
682 return -1;
683 }
684 *encap_limit = tel->encap_limit - 1;
685 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
686 *encap_limit = t->parms.encap_limit;
687 }
688
689 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
690
691 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
692 *dsfield = ipv6_get_dsfield(ipv6h);
693 else
694 *dsfield = ip6_tclass(t->parms.flowinfo);
695
696 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
697 fl6->flowlabel |= ip6_flowlabel(ipv6h);
698
699 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
700 fl6->flowi6_mark = skb->mark;
701 else
702 fl6->flowi6_mark = t->parms.fwmark;
703
704 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
705
706 return 0;
707 }
708
prepare_ip6gre_xmit_other(struct sk_buff * skb,struct net_device * dev,struct flowi6 * fl6,__u8 * dsfield,int * encap_limit)709 static int prepare_ip6gre_xmit_other(struct sk_buff *skb,
710 struct net_device *dev,
711 struct flowi6 *fl6, __u8 *dsfield,
712 int *encap_limit)
713 {
714 struct ip6_tnl *t = netdev_priv(dev);
715
716 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
717 *encap_limit = t->parms.encap_limit;
718
719 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
720
721 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
722 *dsfield = 0;
723 else
724 *dsfield = ip6_tclass(t->parms.flowinfo);
725
726 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
727 fl6->flowi6_mark = skb->mark;
728 else
729 fl6->flowi6_mark = t->parms.fwmark;
730
731 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
732
733 return 0;
734 }
735
skb_tunnel_info_txcheck(struct sk_buff * skb)736 static struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb)
737 {
738 struct ip_tunnel_info *tun_info;
739
740 tun_info = skb_tunnel_info(skb);
741 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX)))
742 return ERR_PTR(-EINVAL);
743
744 return tun_info;
745 }
746
__gre6_xmit(struct sk_buff * skb,struct net_device * dev,__u8 dsfield,struct flowi6 * fl6,int encap_limit,__u32 * pmtu,__be16 proto)747 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
748 struct net_device *dev, __u8 dsfield,
749 struct flowi6 *fl6, int encap_limit,
750 __u32 *pmtu, __be16 proto)
751 {
752 struct ip6_tnl *tunnel = netdev_priv(dev);
753 IP_TUNNEL_DECLARE_FLAGS(flags);
754 __be16 protocol;
755
756 if (dev->type == ARPHRD_ETHER)
757 IPCB(skb)->flags = 0;
758
759 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
760 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
761 else
762 fl6->daddr = tunnel->parms.raddr;
763
764 /* Push GRE header. */
765 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
766
767 if (tunnel->parms.collect_md) {
768 struct ip_tunnel_info *tun_info;
769 const struct ip_tunnel_key *key;
770 int tun_hlen;
771
772 tun_info = skb_tunnel_info_txcheck(skb);
773 if (IS_ERR(tun_info) ||
774 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
775 return -EINVAL;
776
777 key = &tun_info->key;
778 memset(fl6, 0, sizeof(*fl6));
779 fl6->flowi6_proto = IPPROTO_GRE;
780 fl6->daddr = key->u.ipv6.dst;
781 fl6->flowlabel = key->label;
782 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
783 fl6->fl6_gre_key = tunnel_id_to_key32(key->tun_id);
784
785 dsfield = key->tos;
786 ip_tunnel_flags_zero(flags);
787 __set_bit(IP_TUNNEL_CSUM_BIT, flags);
788 __set_bit(IP_TUNNEL_KEY_BIT, flags);
789 __set_bit(IP_TUNNEL_SEQ_BIT, flags);
790 ip_tunnel_flags_and(flags, flags, key->tun_flags);
791 tun_hlen = gre_calc_hlen(flags);
792
793 if (skb_cow_head(skb, dev->needed_headroom ?: tun_hlen + tunnel->encap_hlen))
794 return -ENOMEM;
795
796 gre_build_header(skb, tun_hlen,
797 flags, protocol,
798 tunnel_id_to_key32(tun_info->key.tun_id),
799 test_bit(IP_TUNNEL_SEQ_BIT, flags) ?
800 htonl(atomic_fetch_inc(&tunnel->o_seqno)) :
801 0);
802
803 } else {
804 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
805 return -ENOMEM;
806
807 ip_tunnel_flags_copy(flags, tunnel->parms.o_flags);
808
809 gre_build_header(skb, tunnel->tun_hlen, flags,
810 protocol, tunnel->parms.o_key,
811 test_bit(IP_TUNNEL_SEQ_BIT, flags) ?
812 htonl(atomic_fetch_inc(&tunnel->o_seqno)) :
813 0);
814 }
815
816 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
817 NEXTHDR_GRE);
818 }
819
ip6gre_xmit_ipv4(struct sk_buff * skb,struct net_device * dev)820 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
821 {
822 struct ip6_tnl *t = netdev_priv(dev);
823 int encap_limit = -1;
824 struct flowi6 fl6;
825 __u8 dsfield = 0;
826 __u32 mtu;
827 int err;
828
829 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
830
831 if (!t->parms.collect_md)
832 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
833 &dsfield, &encap_limit);
834
835 err = gre_handle_offloads(skb, test_bit(IP_TUNNEL_CSUM_BIT,
836 t->parms.o_flags));
837 if (err)
838 return -1;
839
840 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
841 skb->protocol);
842 if (err != 0) {
843 /* XXX: send ICMP error even if DF is not set. */
844 if (err == -EMSGSIZE)
845 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
846 htonl(mtu));
847 return -1;
848 }
849
850 return 0;
851 }
852
ip6gre_xmit_ipv6(struct sk_buff * skb,struct net_device * dev)853 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
854 {
855 struct ip6_tnl *t = netdev_priv(dev);
856 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
857 int encap_limit = -1;
858 struct flowi6 fl6;
859 __u8 dsfield = 0;
860 __u32 mtu;
861 int err;
862
863 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
864 return -1;
865
866 if (!t->parms.collect_md &&
867 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
868 return -1;
869
870 if (gre_handle_offloads(skb, test_bit(IP_TUNNEL_CSUM_BIT,
871 t->parms.o_flags)))
872 return -1;
873
874 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
875 &mtu, skb->protocol);
876 if (err != 0) {
877 if (err == -EMSGSIZE)
878 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
879 return -1;
880 }
881
882 return 0;
883 }
884
ip6gre_xmit_other(struct sk_buff * skb,struct net_device * dev)885 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
886 {
887 struct ip6_tnl *t = netdev_priv(dev);
888 int encap_limit = -1;
889 struct flowi6 fl6;
890 __u8 dsfield = 0;
891 __u32 mtu;
892 int err;
893
894 if (!t->parms.collect_md &&
895 prepare_ip6gre_xmit_other(skb, dev, &fl6, &dsfield, &encap_limit))
896 return -1;
897
898 err = gre_handle_offloads(skb, test_bit(IP_TUNNEL_CSUM_BIT,
899 t->parms.o_flags));
900 if (err)
901 return err;
902 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, skb->protocol);
903
904 return err;
905 }
906
ip6gre_tunnel_xmit(struct sk_buff * skb,struct net_device * dev)907 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
908 struct net_device *dev)
909 {
910 struct ip6_tnl *t = netdev_priv(dev);
911 __be16 payload_protocol;
912 int ret;
913
914 if (!pskb_inet_may_pull(skb))
915 goto tx_err;
916
917 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
918 goto tx_err;
919
920 payload_protocol = skb_protocol(skb, true);
921 switch (payload_protocol) {
922 case htons(ETH_P_IP):
923 ret = ip6gre_xmit_ipv4(skb, dev);
924 break;
925 case htons(ETH_P_IPV6):
926 ret = ip6gre_xmit_ipv6(skb, dev);
927 break;
928 default:
929 ret = ip6gre_xmit_other(skb, dev);
930 break;
931 }
932
933 if (ret < 0)
934 goto tx_err;
935
936 return NETDEV_TX_OK;
937
938 tx_err:
939 if (!t->parms.collect_md || !IS_ERR(skb_tunnel_info_txcheck(skb)))
940 DEV_STATS_INC(dev, tx_errors);
941 DEV_STATS_INC(dev, tx_dropped);
942 kfree_skb(skb);
943 return NETDEV_TX_OK;
944 }
945
ip6erspan_tunnel_xmit(struct sk_buff * skb,struct net_device * dev)946 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
947 struct net_device *dev)
948 {
949 struct ip_tunnel_info *tun_info = NULL;
950 struct ip6_tnl *t = netdev_priv(dev);
951 struct dst_entry *dst = skb_dst(skb);
952 IP_TUNNEL_DECLARE_FLAGS(flags) = { };
953 bool truncate = false;
954 int encap_limit = -1;
955 __u8 dsfield = false;
956 struct flowi6 fl6;
957 int err = -EINVAL;
958 __be16 proto;
959 __u32 mtu;
960 int nhoff;
961
962 if (!pskb_inet_may_pull(skb))
963 goto tx_err;
964
965 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
966 goto tx_err;
967
968 if (gre_handle_offloads(skb, false))
969 goto tx_err;
970
971 if (skb->len > dev->mtu + dev->hard_header_len) {
972 if (pskb_trim(skb, dev->mtu + dev->hard_header_len))
973 goto tx_err;
974 truncate = true;
975 }
976
977 nhoff = skb_network_offset(skb);
978 if (skb->protocol == htons(ETH_P_IP) &&
979 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
980 truncate = true;
981
982 if (skb->protocol == htons(ETH_P_IPV6)) {
983 int thoff;
984
985 if (skb_transport_header_was_set(skb))
986 thoff = skb_transport_offset(skb);
987 else
988 thoff = nhoff + sizeof(struct ipv6hdr);
989 if (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)
990 truncate = true;
991 }
992
993 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
994 goto tx_err;
995
996 __clear_bit(IP_TUNNEL_KEY_BIT, t->parms.o_flags);
997 IPCB(skb)->flags = 0;
998
999 /* For collect_md mode, derive fl6 from the tunnel key,
1000 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
1001 */
1002 if (t->parms.collect_md) {
1003 const struct ip_tunnel_key *key;
1004 struct erspan_metadata *md;
1005 __be32 tun_id;
1006
1007 tun_info = skb_tunnel_info_txcheck(skb);
1008 if (IS_ERR(tun_info) ||
1009 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
1010 goto tx_err;
1011
1012 key = &tun_info->key;
1013 memset(&fl6, 0, sizeof(fl6));
1014 fl6.flowi6_proto = IPPROTO_GRE;
1015 fl6.daddr = key->u.ipv6.dst;
1016 fl6.flowlabel = key->label;
1017 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1018 fl6.fl6_gre_key = tunnel_id_to_key32(key->tun_id);
1019
1020 dsfield = key->tos;
1021 if (!test_bit(IP_TUNNEL_ERSPAN_OPT_BIT,
1022 tun_info->key.tun_flags))
1023 goto tx_err;
1024 if (tun_info->options_len < sizeof(*md))
1025 goto tx_err;
1026 md = ip_tunnel_info_opts(tun_info);
1027
1028 tun_id = tunnel_id_to_key32(key->tun_id);
1029 if (md->version == 1) {
1030 erspan_build_header(skb,
1031 ntohl(tun_id),
1032 ntohl(md->u.index), truncate,
1033 false);
1034 proto = htons(ETH_P_ERSPAN);
1035 } else if (md->version == 2) {
1036 erspan_build_header_v2(skb,
1037 ntohl(tun_id),
1038 md->u.md2.dir,
1039 get_hwid(&md->u.md2),
1040 truncate, false);
1041 proto = htons(ETH_P_ERSPAN2);
1042 } else {
1043 goto tx_err;
1044 }
1045 } else {
1046 switch (skb->protocol) {
1047 case htons(ETH_P_IP):
1048 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1049 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1050 &dsfield, &encap_limit);
1051 break;
1052 case htons(ETH_P_IPV6):
1053 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1054 goto tx_err;
1055 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1056 &dsfield, &encap_limit))
1057 goto tx_err;
1058 break;
1059 default:
1060 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1061 break;
1062 }
1063
1064 if (t->parms.erspan_ver == 1) {
1065 erspan_build_header(skb, ntohl(t->parms.o_key),
1066 t->parms.index,
1067 truncate, false);
1068 proto = htons(ETH_P_ERSPAN);
1069 } else if (t->parms.erspan_ver == 2) {
1070 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1071 t->parms.dir,
1072 t->parms.hwid,
1073 truncate, false);
1074 proto = htons(ETH_P_ERSPAN2);
1075 } else {
1076 goto tx_err;
1077 }
1078
1079 fl6.daddr = t->parms.raddr;
1080 }
1081
1082 /* Push GRE header. */
1083 __set_bit(IP_TUNNEL_SEQ_BIT, flags);
1084 gre_build_header(skb, 8, flags, proto, 0,
1085 htonl(atomic_fetch_inc(&t->o_seqno)));
1086
1087 /* TooBig packet may have updated dst->dev's mtu */
1088 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1089 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false);
1090
1091 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1092 NEXTHDR_GRE);
1093 if (err != 0) {
1094 /* XXX: send ICMP error even if DF is not set. */
1095 if (err == -EMSGSIZE) {
1096 if (skb->protocol == htons(ETH_P_IP))
1097 icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1098 ICMP_FRAG_NEEDED, htonl(mtu));
1099 else
1100 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1101 }
1102
1103 goto tx_err;
1104 }
1105 return NETDEV_TX_OK;
1106
1107 tx_err:
1108 if (!IS_ERR(tun_info))
1109 DEV_STATS_INC(dev, tx_errors);
1110 DEV_STATS_INC(dev, tx_dropped);
1111 kfree_skb(skb);
1112 return NETDEV_TX_OK;
1113 }
1114
ip6gre_tnl_link_config_common(struct ip6_tnl * t)1115 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1116 {
1117 struct net_device *dev = t->dev;
1118 struct __ip6_tnl_parm *p = &t->parms;
1119 struct flowi6 *fl6 = &t->fl.u.ip6;
1120
1121 if (dev->type != ARPHRD_ETHER) {
1122 __dev_addr_set(dev, &p->laddr, sizeof(struct in6_addr));
1123 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1124 }
1125
1126 /* Set up flowi template */
1127 fl6->saddr = p->laddr;
1128 fl6->daddr = p->raddr;
1129 fl6->flowi6_oif = p->link;
1130 fl6->flowlabel = 0;
1131 fl6->flowi6_proto = IPPROTO_GRE;
1132 fl6->fl6_gre_key = t->parms.o_key;
1133
1134 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1135 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1136 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1137 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1138
1139 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1140 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1141
1142 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1143 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1144 dev->flags |= IFF_POINTOPOINT;
1145 else
1146 dev->flags &= ~IFF_POINTOPOINT;
1147 }
1148
ip6gre_tnl_link_config_route(struct ip6_tnl * t,int set_mtu,int t_hlen)1149 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1150 int t_hlen)
1151 {
1152 const struct __ip6_tnl_parm *p = &t->parms;
1153 struct net_device *dev = t->dev;
1154
1155 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1156 int strict = (ipv6_addr_type(&p->raddr) &
1157 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1158
1159 struct rt6_info *rt = rt6_lookup(t->net,
1160 &p->raddr, &p->laddr,
1161 p->link, NULL, strict);
1162
1163 if (!rt)
1164 return;
1165
1166 if (rt->dst.dev) {
1167 unsigned short dst_len = rt->dst.dev->hard_header_len +
1168 t_hlen;
1169
1170 if (t->dev->header_ops)
1171 dev->hard_header_len = dst_len;
1172 else
1173 dev->needed_headroom = dst_len;
1174
1175 if (set_mtu) {
1176 int mtu = rt->dst.dev->mtu - t_hlen;
1177
1178 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1179 mtu -= 8;
1180 if (dev->type == ARPHRD_ETHER)
1181 mtu -= ETH_HLEN;
1182
1183 if (mtu < IPV6_MIN_MTU)
1184 mtu = IPV6_MIN_MTU;
1185 WRITE_ONCE(dev->mtu, mtu);
1186 }
1187 }
1188 ip6_rt_put(rt);
1189 }
1190 }
1191
ip6gre_calc_hlen(struct ip6_tnl * tunnel)1192 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1193 {
1194 int t_hlen;
1195
1196 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1197 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1198
1199 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1200
1201 if (tunnel->dev->header_ops)
1202 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1203 else
1204 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1205
1206 return t_hlen;
1207 }
1208
ip6gre_tnl_link_config(struct ip6_tnl * t,int set_mtu)1209 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1210 {
1211 ip6gre_tnl_link_config_common(t);
1212 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1213 }
1214
ip6gre_tnl_copy_tnl_parm(struct ip6_tnl * t,const struct __ip6_tnl_parm * p)1215 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1216 const struct __ip6_tnl_parm *p)
1217 {
1218 t->parms.laddr = p->laddr;
1219 t->parms.raddr = p->raddr;
1220 t->parms.flags = p->flags;
1221 t->parms.hop_limit = p->hop_limit;
1222 t->parms.encap_limit = p->encap_limit;
1223 t->parms.flowinfo = p->flowinfo;
1224 t->parms.link = p->link;
1225 t->parms.proto = p->proto;
1226 t->parms.i_key = p->i_key;
1227 t->parms.o_key = p->o_key;
1228 ip_tunnel_flags_copy(t->parms.i_flags, p->i_flags);
1229 ip_tunnel_flags_copy(t->parms.o_flags, p->o_flags);
1230 t->parms.fwmark = p->fwmark;
1231 t->parms.erspan_ver = p->erspan_ver;
1232 t->parms.index = p->index;
1233 t->parms.dir = p->dir;
1234 t->parms.hwid = p->hwid;
1235 dst_cache_reset(&t->dst_cache);
1236 }
1237
ip6gre_tnl_change(struct ip6_tnl * t,const struct __ip6_tnl_parm * p,int set_mtu)1238 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1239 int set_mtu)
1240 {
1241 ip6gre_tnl_copy_tnl_parm(t, p);
1242 ip6gre_tnl_link_config(t, set_mtu);
1243 return 0;
1244 }
1245
ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm * p,const struct ip6_tnl_parm2 * u)1246 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1247 const struct ip6_tnl_parm2 *u)
1248 {
1249 p->laddr = u->laddr;
1250 p->raddr = u->raddr;
1251 p->flags = u->flags;
1252 p->hop_limit = u->hop_limit;
1253 p->encap_limit = u->encap_limit;
1254 p->flowinfo = u->flowinfo;
1255 p->link = u->link;
1256 p->i_key = u->i_key;
1257 p->o_key = u->o_key;
1258 gre_flags_to_tnl_flags(p->i_flags, u->i_flags);
1259 gre_flags_to_tnl_flags(p->o_flags, u->o_flags);
1260 memcpy(p->name, u->name, sizeof(u->name));
1261 }
1262
ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 * u,const struct __ip6_tnl_parm * p)1263 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1264 const struct __ip6_tnl_parm *p)
1265 {
1266 u->proto = IPPROTO_GRE;
1267 u->laddr = p->laddr;
1268 u->raddr = p->raddr;
1269 u->flags = p->flags;
1270 u->hop_limit = p->hop_limit;
1271 u->encap_limit = p->encap_limit;
1272 u->flowinfo = p->flowinfo;
1273 u->link = p->link;
1274 u->i_key = p->i_key;
1275 u->o_key = p->o_key;
1276 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1277 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1278 memcpy(u->name, p->name, sizeof(u->name));
1279 }
1280
ip6gre_tunnel_siocdevprivate(struct net_device * dev,struct ifreq * ifr,void __user * data,int cmd)1281 static int ip6gre_tunnel_siocdevprivate(struct net_device *dev,
1282 struct ifreq *ifr, void __user *data,
1283 int cmd)
1284 {
1285 int err = 0;
1286 struct ip6_tnl_parm2 p;
1287 struct __ip6_tnl_parm p1;
1288 struct ip6_tnl *t = netdev_priv(dev);
1289 struct net *net = t->net;
1290 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1291
1292 memset(&p1, 0, sizeof(p1));
1293
1294 switch (cmd) {
1295 case SIOCGETTUNNEL:
1296 if (dev == ign->fb_tunnel_dev) {
1297 if (copy_from_user(&p, data, sizeof(p))) {
1298 err = -EFAULT;
1299 break;
1300 }
1301 ip6gre_tnl_parm_from_user(&p1, &p);
1302 t = ip6gre_tunnel_locate(net, &p1, 0);
1303 if (!t)
1304 t = netdev_priv(dev);
1305 }
1306 memset(&p, 0, sizeof(p));
1307 ip6gre_tnl_parm_to_user(&p, &t->parms);
1308 if (copy_to_user(data, &p, sizeof(p)))
1309 err = -EFAULT;
1310 break;
1311
1312 case SIOCADDTUNNEL:
1313 case SIOCCHGTUNNEL:
1314 err = -EPERM;
1315 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1316 goto done;
1317
1318 err = -EFAULT;
1319 if (copy_from_user(&p, data, sizeof(p)))
1320 goto done;
1321
1322 err = -EINVAL;
1323 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1324 goto done;
1325
1326 if (!(p.i_flags&GRE_KEY))
1327 p.i_key = 0;
1328 if (!(p.o_flags&GRE_KEY))
1329 p.o_key = 0;
1330
1331 ip6gre_tnl_parm_from_user(&p1, &p);
1332 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1333
1334 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1335 if (t) {
1336 if (t->dev != dev) {
1337 err = -EEXIST;
1338 break;
1339 }
1340 } else {
1341 t = netdev_priv(dev);
1342
1343 ip6gre_tunnel_unlink(ign, t);
1344 synchronize_net();
1345 ip6gre_tnl_change(t, &p1, 1);
1346 ip6gre_tunnel_link(ign, t);
1347 netdev_state_change(dev);
1348 }
1349 }
1350
1351 if (t) {
1352 err = 0;
1353
1354 memset(&p, 0, sizeof(p));
1355 ip6gre_tnl_parm_to_user(&p, &t->parms);
1356 if (copy_to_user(data, &p, sizeof(p)))
1357 err = -EFAULT;
1358 } else
1359 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1360 break;
1361
1362 case SIOCDELTUNNEL:
1363 err = -EPERM;
1364 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1365 goto done;
1366
1367 if (dev == ign->fb_tunnel_dev) {
1368 err = -EFAULT;
1369 if (copy_from_user(&p, data, sizeof(p)))
1370 goto done;
1371 err = -ENOENT;
1372 ip6gre_tnl_parm_from_user(&p1, &p);
1373 t = ip6gre_tunnel_locate(net, &p1, 0);
1374 if (!t)
1375 goto done;
1376 err = -EPERM;
1377 if (t == netdev_priv(ign->fb_tunnel_dev))
1378 goto done;
1379 dev = t->dev;
1380 }
1381 unregister_netdevice(dev);
1382 err = 0;
1383 break;
1384
1385 default:
1386 err = -EINVAL;
1387 }
1388
1389 done:
1390 return err;
1391 }
1392
ip6gre_header(struct sk_buff * skb,struct net_device * dev,unsigned short type,const void * daddr,const void * saddr,unsigned int len)1393 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1394 unsigned short type, const void *daddr,
1395 const void *saddr, unsigned int len)
1396 {
1397 struct ip6_tnl *t = netdev_priv(dev);
1398 struct ipv6hdr *ipv6h;
1399 __be16 *p;
1400
1401 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1402 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1403 t->fl.u.ip6.flowlabel,
1404 true, &t->fl.u.ip6));
1405 ipv6h->hop_limit = t->parms.hop_limit;
1406 ipv6h->nexthdr = NEXTHDR_GRE;
1407 ipv6h->saddr = t->parms.laddr;
1408 ipv6h->daddr = t->parms.raddr;
1409
1410 p = (__be16 *)(ipv6h + 1);
1411 p[0] = ip_tunnel_flags_to_be16(t->parms.o_flags);
1412 p[1] = htons(type);
1413
1414 /*
1415 * Set the source hardware address.
1416 */
1417
1418 if (saddr)
1419 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1420 if (daddr)
1421 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1422 if (!ipv6_addr_any(&ipv6h->daddr))
1423 return t->hlen;
1424
1425 return -t->hlen;
1426 }
1427
1428 static const struct header_ops ip6gre_header_ops = {
1429 .create = ip6gre_header,
1430 };
1431
1432 static const struct net_device_ops ip6gre_netdev_ops = {
1433 .ndo_init = ip6gre_tunnel_init,
1434 .ndo_uninit = ip6gre_tunnel_uninit,
1435 .ndo_start_xmit = ip6gre_tunnel_xmit,
1436 .ndo_siocdevprivate = ip6gre_tunnel_siocdevprivate,
1437 .ndo_change_mtu = ip6_tnl_change_mtu,
1438 .ndo_get_iflink = ip6_tnl_get_iflink,
1439 };
1440
ip6gre_dev_free(struct net_device * dev)1441 static void ip6gre_dev_free(struct net_device *dev)
1442 {
1443 struct ip6_tnl *t = netdev_priv(dev);
1444
1445 gro_cells_destroy(&t->gro_cells);
1446 dst_cache_destroy(&t->dst_cache);
1447 }
1448
ip6gre_tunnel_setup(struct net_device * dev)1449 static void ip6gre_tunnel_setup(struct net_device *dev)
1450 {
1451 dev->netdev_ops = &ip6gre_netdev_ops;
1452 dev->needs_free_netdev = true;
1453 dev->priv_destructor = ip6gre_dev_free;
1454
1455 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
1456 dev->type = ARPHRD_IP6GRE;
1457
1458 dev->flags |= IFF_NOARP;
1459 dev->addr_len = sizeof(struct in6_addr);
1460 netif_keep_dst(dev);
1461 /* This perm addr will be used as interface identifier by IPv6 */
1462 dev->addr_assign_type = NET_ADDR_RANDOM;
1463 eth_random_addr(dev->perm_addr);
1464 }
1465
1466 #define GRE6_FEATURES (NETIF_F_SG | \
1467 NETIF_F_FRAGLIST | \
1468 NETIF_F_HIGHDMA | \
1469 NETIF_F_HW_CSUM)
1470
ip6gre_tnl_init_features(struct net_device * dev)1471 static void ip6gre_tnl_init_features(struct net_device *dev)
1472 {
1473 struct ip6_tnl *nt = netdev_priv(dev);
1474
1475 dev->features |= GRE6_FEATURES;
1476 dev->hw_features |= GRE6_FEATURES;
1477
1478 /* TCP offload with GRE SEQ is not supported, nor can we support 2
1479 * levels of outer headers requiring an update.
1480 */
1481 if (test_bit(IP_TUNNEL_SEQ_BIT, nt->parms.o_flags))
1482 return;
1483 if (test_bit(IP_TUNNEL_CSUM_BIT, nt->parms.o_flags) &&
1484 nt->encap.type != TUNNEL_ENCAP_NONE)
1485 return;
1486
1487 dev->features |= NETIF_F_GSO_SOFTWARE;
1488 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1489
1490 dev->lltx = true;
1491 }
1492
ip6gre_tunnel_init_common(struct net_device * dev)1493 static int ip6gre_tunnel_init_common(struct net_device *dev)
1494 {
1495 struct ip6_tnl *tunnel;
1496 int ret;
1497 int t_hlen;
1498
1499 tunnel = netdev_priv(dev);
1500
1501 tunnel->dev = dev;
1502 strcpy(tunnel->parms.name, dev->name);
1503
1504 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1505 if (ret)
1506 return ret;
1507
1508 ret = gro_cells_init(&tunnel->gro_cells, dev);
1509 if (ret)
1510 goto cleanup_dst_cache_init;
1511
1512 t_hlen = ip6gre_calc_hlen(tunnel);
1513 dev->mtu = ETH_DATA_LEN - t_hlen;
1514 if (dev->type == ARPHRD_ETHER)
1515 dev->mtu -= ETH_HLEN;
1516 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1517 dev->mtu -= 8;
1518
1519 if (tunnel->parms.collect_md) {
1520 netif_keep_dst(dev);
1521 }
1522 ip6gre_tnl_init_features(dev);
1523
1524 netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
1525 netdev_lockdep_set_classes(dev);
1526 return 0;
1527
1528 cleanup_dst_cache_init:
1529 dst_cache_destroy(&tunnel->dst_cache);
1530 return ret;
1531 }
1532
ip6gre_tunnel_init(struct net_device * dev)1533 static int ip6gre_tunnel_init(struct net_device *dev)
1534 {
1535 struct ip6_tnl *tunnel;
1536 int ret;
1537
1538 ret = ip6gre_tunnel_init_common(dev);
1539 if (ret)
1540 return ret;
1541
1542 tunnel = netdev_priv(dev);
1543
1544 if (tunnel->parms.collect_md)
1545 return 0;
1546
1547 __dev_addr_set(dev, &tunnel->parms.laddr, sizeof(struct in6_addr));
1548 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1549
1550 if (ipv6_addr_any(&tunnel->parms.raddr))
1551 dev->header_ops = &ip6gre_header_ops;
1552
1553 return 0;
1554 }
1555
ip6gre_fb_tunnel_init(struct net_device * dev)1556 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1557 {
1558 struct ip6_tnl *tunnel = netdev_priv(dev);
1559
1560 tunnel->dev = dev;
1561 tunnel->net = dev_net(dev);
1562 strcpy(tunnel->parms.name, dev->name);
1563
1564 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1565 }
1566
1567 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1568 .handler = gre_rcv,
1569 .err_handler = ip6gre_err,
1570 .flags = INET6_PROTO_FINAL,
1571 };
1572
ip6gre_destroy_tunnels(struct net * net,struct list_head * head)1573 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1574 {
1575 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1576 struct net_device *dev, *aux;
1577 int prio;
1578
1579 for_each_netdev_safe(net, dev, aux)
1580 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1581 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1582 dev->rtnl_link_ops == &ip6erspan_tap_ops)
1583 unregister_netdevice_queue(dev, head);
1584
1585 for (prio = 0; prio < 4; prio++) {
1586 int h;
1587 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1588 struct ip6_tnl *t;
1589
1590 t = rtnl_dereference(ign->tunnels[prio][h]);
1591
1592 while (t) {
1593 /* If dev is in the same netns, it has already
1594 * been added to the list by the previous loop.
1595 */
1596 if (!net_eq(dev_net(t->dev), net))
1597 unregister_netdevice_queue(t->dev,
1598 head);
1599 t = rtnl_dereference(t->next);
1600 }
1601 }
1602 }
1603 }
1604
ip6gre_init_net(struct net * net)1605 static int __net_init ip6gre_init_net(struct net *net)
1606 {
1607 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1608 struct net_device *ndev;
1609 int err;
1610
1611 if (!net_has_fallback_tunnels(net))
1612 return 0;
1613 ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1614 NET_NAME_UNKNOWN, ip6gre_tunnel_setup);
1615 if (!ndev) {
1616 err = -ENOMEM;
1617 goto err_alloc_dev;
1618 }
1619 ign->fb_tunnel_dev = ndev;
1620 dev_net_set(ign->fb_tunnel_dev, net);
1621 /* FB netdevice is special: we have one, and only one per netns.
1622 * Allowing to move it to another netns is clearly unsafe.
1623 */
1624 ign->fb_tunnel_dev->netns_immutable = true;
1625
1626 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1627 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1628
1629 err = register_netdev(ign->fb_tunnel_dev);
1630 if (err)
1631 goto err_reg_dev;
1632
1633 rcu_assign_pointer(ign->tunnels_wc[0],
1634 netdev_priv(ign->fb_tunnel_dev));
1635 return 0;
1636
1637 err_reg_dev:
1638 free_netdev(ndev);
1639 err_alloc_dev:
1640 return err;
1641 }
1642
ip6gre_exit_batch_rtnl(struct list_head * net_list,struct list_head * dev_to_kill)1643 static void __net_exit ip6gre_exit_batch_rtnl(struct list_head *net_list,
1644 struct list_head *dev_to_kill)
1645 {
1646 struct net *net;
1647
1648 ASSERT_RTNL();
1649 list_for_each_entry(net, net_list, exit_list)
1650 ip6gre_destroy_tunnels(net, dev_to_kill);
1651 }
1652
1653 static struct pernet_operations ip6gre_net_ops = {
1654 .init = ip6gre_init_net,
1655 .exit_batch_rtnl = ip6gre_exit_batch_rtnl,
1656 .id = &ip6gre_net_id,
1657 .size = sizeof(struct ip6gre_net),
1658 };
1659
ip6gre_tunnel_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1660 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1661 struct netlink_ext_ack *extack)
1662 {
1663 __be16 flags;
1664
1665 if (!data)
1666 return 0;
1667
1668 flags = 0;
1669 if (data[IFLA_GRE_IFLAGS])
1670 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1671 if (data[IFLA_GRE_OFLAGS])
1672 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1673 if (flags & (GRE_VERSION|GRE_ROUTING))
1674 return -EINVAL;
1675
1676 return 0;
1677 }
1678
ip6gre_tap_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1679 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1680 struct netlink_ext_ack *extack)
1681 {
1682 struct in6_addr daddr;
1683
1684 if (tb[IFLA_ADDRESS]) {
1685 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1686 return -EINVAL;
1687 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1688 return -EADDRNOTAVAIL;
1689 }
1690
1691 if (!data)
1692 goto out;
1693
1694 if (data[IFLA_GRE_REMOTE]) {
1695 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1696 if (ipv6_addr_any(&daddr))
1697 return -EINVAL;
1698 }
1699
1700 out:
1701 return ip6gre_tunnel_validate(tb, data, extack);
1702 }
1703
ip6erspan_tap_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1704 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1705 struct netlink_ext_ack *extack)
1706 {
1707 __be16 flags = 0;
1708 int ret, ver = 0;
1709
1710 if (!data)
1711 return 0;
1712
1713 ret = ip6gre_tap_validate(tb, data, extack);
1714 if (ret)
1715 return ret;
1716
1717 /* ERSPAN should only have GRE sequence and key flag */
1718 if (data[IFLA_GRE_OFLAGS])
1719 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1720 if (data[IFLA_GRE_IFLAGS])
1721 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1722 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1723 flags != (GRE_SEQ | GRE_KEY))
1724 return -EINVAL;
1725
1726 /* ERSPAN Session ID only has 10-bit. Since we reuse
1727 * 32-bit key field as ID, check it's range.
1728 */
1729 if (data[IFLA_GRE_IKEY] &&
1730 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1731 return -EINVAL;
1732
1733 if (data[IFLA_GRE_OKEY] &&
1734 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1735 return -EINVAL;
1736
1737 if (data[IFLA_GRE_ERSPAN_VER]) {
1738 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1739 if (ver != 1 && ver != 2)
1740 return -EINVAL;
1741 }
1742
1743 if (ver == 1) {
1744 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1745 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1746
1747 if (index & ~INDEX_MASK)
1748 return -EINVAL;
1749 }
1750 } else if (ver == 2) {
1751 if (data[IFLA_GRE_ERSPAN_DIR]) {
1752 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1753
1754 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1755 return -EINVAL;
1756 }
1757
1758 if (data[IFLA_GRE_ERSPAN_HWID]) {
1759 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1760
1761 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1762 return -EINVAL;
1763 }
1764 }
1765
1766 return 0;
1767 }
1768
ip6erspan_set_version(struct nlattr * data[],struct __ip6_tnl_parm * parms)1769 static void ip6erspan_set_version(struct nlattr *data[],
1770 struct __ip6_tnl_parm *parms)
1771 {
1772 if (!data)
1773 return;
1774
1775 parms->erspan_ver = 1;
1776 if (data[IFLA_GRE_ERSPAN_VER])
1777 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1778
1779 if (parms->erspan_ver == 1) {
1780 if (data[IFLA_GRE_ERSPAN_INDEX])
1781 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1782 } else if (parms->erspan_ver == 2) {
1783 if (data[IFLA_GRE_ERSPAN_DIR])
1784 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1785 if (data[IFLA_GRE_ERSPAN_HWID])
1786 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1787 }
1788 }
1789
ip6gre_netlink_parms(struct nlattr * data[],struct __ip6_tnl_parm * parms)1790 static void ip6gre_netlink_parms(struct nlattr *data[],
1791 struct __ip6_tnl_parm *parms)
1792 {
1793 memset(parms, 0, sizeof(*parms));
1794
1795 if (!data)
1796 return;
1797
1798 if (data[IFLA_GRE_LINK])
1799 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1800
1801 if (data[IFLA_GRE_IFLAGS])
1802 gre_flags_to_tnl_flags(parms->i_flags,
1803 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1804
1805 if (data[IFLA_GRE_OFLAGS])
1806 gre_flags_to_tnl_flags(parms->o_flags,
1807 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1808
1809 if (data[IFLA_GRE_IKEY])
1810 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1811
1812 if (data[IFLA_GRE_OKEY])
1813 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1814
1815 if (data[IFLA_GRE_LOCAL])
1816 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1817
1818 if (data[IFLA_GRE_REMOTE])
1819 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1820
1821 if (data[IFLA_GRE_TTL])
1822 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1823
1824 if (data[IFLA_GRE_ENCAP_LIMIT])
1825 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1826
1827 if (data[IFLA_GRE_FLOWINFO])
1828 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1829
1830 if (data[IFLA_GRE_FLAGS])
1831 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1832
1833 if (data[IFLA_GRE_FWMARK])
1834 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1835
1836 if (data[IFLA_GRE_COLLECT_METADATA])
1837 parms->collect_md = true;
1838 }
1839
ip6gre_tap_init(struct net_device * dev)1840 static int ip6gre_tap_init(struct net_device *dev)
1841 {
1842 int ret;
1843
1844 ret = ip6gre_tunnel_init_common(dev);
1845 if (ret)
1846 return ret;
1847
1848 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1849
1850 return 0;
1851 }
1852
1853 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1854 .ndo_init = ip6gre_tap_init,
1855 .ndo_uninit = ip6gre_tunnel_uninit,
1856 .ndo_start_xmit = ip6gre_tunnel_xmit,
1857 .ndo_set_mac_address = eth_mac_addr,
1858 .ndo_validate_addr = eth_validate_addr,
1859 .ndo_change_mtu = ip6_tnl_change_mtu,
1860 .ndo_get_iflink = ip6_tnl_get_iflink,
1861 };
1862
ip6erspan_calc_hlen(struct ip6_tnl * tunnel)1863 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1864 {
1865 int t_hlen;
1866
1867 tunnel->tun_hlen = 8;
1868 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1869 erspan_hdr_len(tunnel->parms.erspan_ver);
1870
1871 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1872 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1873 return t_hlen;
1874 }
1875
ip6erspan_tap_init(struct net_device * dev)1876 static int ip6erspan_tap_init(struct net_device *dev)
1877 {
1878 struct ip6_tnl *tunnel;
1879 int t_hlen;
1880 int ret;
1881
1882 tunnel = netdev_priv(dev);
1883
1884 tunnel->dev = dev;
1885 strcpy(tunnel->parms.name, dev->name);
1886
1887 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1888 if (ret)
1889 return ret;
1890
1891 ret = gro_cells_init(&tunnel->gro_cells, dev);
1892 if (ret)
1893 goto cleanup_dst_cache_init;
1894
1895 t_hlen = ip6erspan_calc_hlen(tunnel);
1896 dev->mtu = ETH_DATA_LEN - t_hlen;
1897 if (dev->type == ARPHRD_ETHER)
1898 dev->mtu -= ETH_HLEN;
1899 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1900 dev->mtu -= 8;
1901
1902 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1903 ip6erspan_tnl_link_config(tunnel, 1);
1904
1905 netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
1906 netdev_lockdep_set_classes(dev);
1907 return 0;
1908
1909 cleanup_dst_cache_init:
1910 dst_cache_destroy(&tunnel->dst_cache);
1911 return ret;
1912 }
1913
1914 static const struct net_device_ops ip6erspan_netdev_ops = {
1915 .ndo_init = ip6erspan_tap_init,
1916 .ndo_uninit = ip6erspan_tunnel_uninit,
1917 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1918 .ndo_set_mac_address = eth_mac_addr,
1919 .ndo_validate_addr = eth_validate_addr,
1920 .ndo_change_mtu = ip6_tnl_change_mtu,
1921 .ndo_get_iflink = ip6_tnl_get_iflink,
1922 };
1923
ip6gre_tap_setup(struct net_device * dev)1924 static void ip6gre_tap_setup(struct net_device *dev)
1925 {
1926
1927 ether_setup(dev);
1928
1929 dev->max_mtu = 0;
1930 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1931 dev->needs_free_netdev = true;
1932 dev->priv_destructor = ip6gre_dev_free;
1933
1934 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
1935 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1936 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1937 netif_keep_dst(dev);
1938 }
1939
ip6gre_netlink_encap_parms(struct nlattr * data[],struct ip_tunnel_encap * ipencap)1940 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1941 struct ip_tunnel_encap *ipencap)
1942 {
1943 bool ret = false;
1944
1945 memset(ipencap, 0, sizeof(*ipencap));
1946
1947 if (!data)
1948 return ret;
1949
1950 if (data[IFLA_GRE_ENCAP_TYPE]) {
1951 ret = true;
1952 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1953 }
1954
1955 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1956 ret = true;
1957 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1958 }
1959
1960 if (data[IFLA_GRE_ENCAP_SPORT]) {
1961 ret = true;
1962 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1963 }
1964
1965 if (data[IFLA_GRE_ENCAP_DPORT]) {
1966 ret = true;
1967 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1968 }
1969
1970 return ret;
1971 }
1972
ip6gre_newlink_common(struct net * link_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1973 static int ip6gre_newlink_common(struct net *link_net, struct net_device *dev,
1974 struct nlattr *tb[], struct nlattr *data[],
1975 struct netlink_ext_ack *extack)
1976 {
1977 struct ip6_tnl *nt;
1978 struct ip_tunnel_encap ipencap;
1979 int err;
1980
1981 nt = netdev_priv(dev);
1982
1983 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1984 int err = ip6_tnl_encap_setup(nt, &ipencap);
1985
1986 if (err < 0)
1987 return err;
1988 }
1989
1990 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1991 eth_hw_addr_random(dev);
1992
1993 nt->dev = dev;
1994 nt->net = link_net;
1995
1996 err = register_netdevice(dev);
1997 if (err)
1998 goto out;
1999
2000 if (tb[IFLA_MTU])
2001 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2002
2003 out:
2004 return err;
2005 }
2006
ip6gre_newlink(struct net_device * dev,struct rtnl_newlink_params * params,struct netlink_ext_ack * extack)2007 static int ip6gre_newlink(struct net_device *dev,
2008 struct rtnl_newlink_params *params,
2009 struct netlink_ext_ack *extack)
2010 {
2011 struct net *net = params->link_net ? : dev_net(dev);
2012 struct ip6_tnl *nt = netdev_priv(dev);
2013 struct nlattr **data = params->data;
2014 struct nlattr **tb = params->tb;
2015 struct ip6gre_net *ign;
2016 int err;
2017
2018 ip6gre_netlink_parms(data, &nt->parms);
2019 ign = net_generic(net, ip6gre_net_id);
2020
2021 if (nt->parms.collect_md) {
2022 if (rtnl_dereference(ign->collect_md_tun))
2023 return -EEXIST;
2024 } else {
2025 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2026 return -EEXIST;
2027 }
2028
2029 err = ip6gre_newlink_common(net, dev, tb, data, extack);
2030 if (!err) {
2031 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
2032 ip6gre_tunnel_link_md(ign, nt);
2033 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2034 }
2035 return err;
2036 }
2037
2038 static struct ip6_tnl *
ip6gre_changelink_common(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct __ip6_tnl_parm * p_p,struct netlink_ext_ack * extack)2039 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2040 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2041 struct netlink_ext_ack *extack)
2042 {
2043 struct ip6_tnl *t, *nt = netdev_priv(dev);
2044 struct net *net = nt->net;
2045 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2046 struct ip_tunnel_encap ipencap;
2047
2048 if (dev == ign->fb_tunnel_dev)
2049 return ERR_PTR(-EINVAL);
2050
2051 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2052 int err = ip6_tnl_encap_setup(nt, &ipencap);
2053
2054 if (err < 0)
2055 return ERR_PTR(err);
2056 }
2057
2058 ip6gre_netlink_parms(data, p_p);
2059
2060 t = ip6gre_tunnel_locate(net, p_p, 0);
2061
2062 if (t) {
2063 if (t->dev != dev)
2064 return ERR_PTR(-EEXIST);
2065 } else {
2066 t = nt;
2067 }
2068
2069 return t;
2070 }
2071
ip6gre_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2072 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2073 struct nlattr *data[],
2074 struct netlink_ext_ack *extack)
2075 {
2076 struct ip6_tnl *t = netdev_priv(dev);
2077 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2078 struct __ip6_tnl_parm p;
2079
2080 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2081 if (IS_ERR(t))
2082 return PTR_ERR(t);
2083
2084 ip6gre_tunnel_unlink_md(ign, t);
2085 ip6gre_tunnel_unlink(ign, t);
2086 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2087 ip6gre_tunnel_link_md(ign, t);
2088 ip6gre_tunnel_link(ign, t);
2089 return 0;
2090 }
2091
ip6gre_dellink(struct net_device * dev,struct list_head * head)2092 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2093 {
2094 struct net *net = dev_net(dev);
2095 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2096
2097 if (dev != ign->fb_tunnel_dev)
2098 unregister_netdevice_queue(dev, head);
2099 }
2100
ip6gre_get_size(const struct net_device * dev)2101 static size_t ip6gre_get_size(const struct net_device *dev)
2102 {
2103 return
2104 /* IFLA_GRE_LINK */
2105 nla_total_size(4) +
2106 /* IFLA_GRE_IFLAGS */
2107 nla_total_size(2) +
2108 /* IFLA_GRE_OFLAGS */
2109 nla_total_size(2) +
2110 /* IFLA_GRE_IKEY */
2111 nla_total_size(4) +
2112 /* IFLA_GRE_OKEY */
2113 nla_total_size(4) +
2114 /* IFLA_GRE_LOCAL */
2115 nla_total_size(sizeof(struct in6_addr)) +
2116 /* IFLA_GRE_REMOTE */
2117 nla_total_size(sizeof(struct in6_addr)) +
2118 /* IFLA_GRE_TTL */
2119 nla_total_size(1) +
2120 /* IFLA_GRE_ENCAP_LIMIT */
2121 nla_total_size(1) +
2122 /* IFLA_GRE_FLOWINFO */
2123 nla_total_size(4) +
2124 /* IFLA_GRE_FLAGS */
2125 nla_total_size(4) +
2126 /* IFLA_GRE_ENCAP_TYPE */
2127 nla_total_size(2) +
2128 /* IFLA_GRE_ENCAP_FLAGS */
2129 nla_total_size(2) +
2130 /* IFLA_GRE_ENCAP_SPORT */
2131 nla_total_size(2) +
2132 /* IFLA_GRE_ENCAP_DPORT */
2133 nla_total_size(2) +
2134 /* IFLA_GRE_COLLECT_METADATA */
2135 nla_total_size(0) +
2136 /* IFLA_GRE_FWMARK */
2137 nla_total_size(4) +
2138 /* IFLA_GRE_ERSPAN_INDEX */
2139 nla_total_size(4) +
2140 0;
2141 }
2142
ip6gre_fill_info(struct sk_buff * skb,const struct net_device * dev)2143 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2144 {
2145 struct ip6_tnl *t = netdev_priv(dev);
2146 struct __ip6_tnl_parm *p = &t->parms;
2147 IP_TUNNEL_DECLARE_FLAGS(o_flags);
2148
2149 ip_tunnel_flags_copy(o_flags, p->o_flags);
2150
2151 if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2152 if (!p->collect_md)
2153 __set_bit(IP_TUNNEL_KEY_BIT, o_flags);
2154
2155 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2156 goto nla_put_failure;
2157
2158 if (p->erspan_ver == 1) {
2159 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2160 goto nla_put_failure;
2161 } else {
2162 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2163 goto nla_put_failure;
2164 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2165 goto nla_put_failure;
2166 }
2167 }
2168
2169 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2170 nla_put_be16(skb, IFLA_GRE_IFLAGS,
2171 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2172 nla_put_be16(skb, IFLA_GRE_OFLAGS,
2173 gre_tnl_flags_to_gre_flags(o_flags)) ||
2174 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2175 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2176 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2177 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2178 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2179 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2180 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2181 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2182 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
2183 goto nla_put_failure;
2184
2185 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2186 t->encap.type) ||
2187 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2188 t->encap.sport) ||
2189 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2190 t->encap.dport) ||
2191 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2192 t->encap.flags))
2193 goto nla_put_failure;
2194
2195 if (p->collect_md) {
2196 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2197 goto nla_put_failure;
2198 }
2199
2200 return 0;
2201
2202 nla_put_failure:
2203 return -EMSGSIZE;
2204 }
2205
2206 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2207 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2208 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2209 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2210 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2211 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2212 [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct ipv6hdr, saddr) },
2213 [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct ipv6hdr, daddr) },
2214 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2215 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2216 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2217 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
2218 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2219 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2220 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2221 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
2222 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2223 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
2224 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2225 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2226 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2227 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
2228 };
2229
ip6erspan_tap_setup(struct net_device * dev)2230 static void ip6erspan_tap_setup(struct net_device *dev)
2231 {
2232 ether_setup(dev);
2233
2234 dev->max_mtu = 0;
2235 dev->netdev_ops = &ip6erspan_netdev_ops;
2236 dev->needs_free_netdev = true;
2237 dev->priv_destructor = ip6gre_dev_free;
2238
2239 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
2240 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2241 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2242 netif_keep_dst(dev);
2243 }
2244
ip6erspan_newlink(struct net_device * dev,struct rtnl_newlink_params * params,struct netlink_ext_ack * extack)2245 static int ip6erspan_newlink(struct net_device *dev,
2246 struct rtnl_newlink_params *params,
2247 struct netlink_ext_ack *extack)
2248 {
2249 struct net *net = params->link_net ? : dev_net(dev);
2250 struct ip6_tnl *nt = netdev_priv(dev);
2251 struct nlattr **data = params->data;
2252 struct nlattr **tb = params->tb;
2253 struct ip6gre_net *ign;
2254 int err;
2255
2256 ip6gre_netlink_parms(data, &nt->parms);
2257 ip6erspan_set_version(data, &nt->parms);
2258 ign = net_generic(net, ip6gre_net_id);
2259
2260 if (nt->parms.collect_md) {
2261 if (rtnl_dereference(ign->collect_md_tun_erspan))
2262 return -EEXIST;
2263 } else {
2264 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2265 return -EEXIST;
2266 }
2267
2268 err = ip6gre_newlink_common(net, dev, tb, data, extack);
2269 if (!err) {
2270 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2271 ip6erspan_tunnel_link_md(ign, nt);
2272 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2273 }
2274 return err;
2275 }
2276
ip6erspan_tnl_link_config(struct ip6_tnl * t,int set_mtu)2277 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2278 {
2279 ip6gre_tnl_link_config_common(t);
2280 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2281 }
2282
ip6erspan_tnl_change(struct ip6_tnl * t,const struct __ip6_tnl_parm * p,int set_mtu)2283 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2284 const struct __ip6_tnl_parm *p, int set_mtu)
2285 {
2286 ip6gre_tnl_copy_tnl_parm(t, p);
2287 ip6erspan_tnl_link_config(t, set_mtu);
2288 return 0;
2289 }
2290
ip6erspan_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2291 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2292 struct nlattr *data[],
2293 struct netlink_ext_ack *extack)
2294 {
2295 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2296 struct __ip6_tnl_parm p;
2297 struct ip6_tnl *t;
2298
2299 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2300 if (IS_ERR(t))
2301 return PTR_ERR(t);
2302
2303 ip6erspan_set_version(data, &p);
2304 ip6gre_tunnel_unlink_md(ign, t);
2305 ip6gre_tunnel_unlink(ign, t);
2306 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2307 ip6erspan_tunnel_link_md(ign, t);
2308 ip6gre_tunnel_link(ign, t);
2309 return 0;
2310 }
2311
2312 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2313 .kind = "ip6gre",
2314 .maxtype = IFLA_GRE_MAX,
2315 .policy = ip6gre_policy,
2316 .priv_size = sizeof(struct ip6_tnl),
2317 .setup = ip6gre_tunnel_setup,
2318 .validate = ip6gre_tunnel_validate,
2319 .newlink = ip6gre_newlink,
2320 .changelink = ip6gre_changelink,
2321 .dellink = ip6gre_dellink,
2322 .get_size = ip6gre_get_size,
2323 .fill_info = ip6gre_fill_info,
2324 .get_link_net = ip6_tnl_get_link_net,
2325 };
2326
2327 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2328 .kind = "ip6gretap",
2329 .maxtype = IFLA_GRE_MAX,
2330 .policy = ip6gre_policy,
2331 .priv_size = sizeof(struct ip6_tnl),
2332 .setup = ip6gre_tap_setup,
2333 .validate = ip6gre_tap_validate,
2334 .newlink = ip6gre_newlink,
2335 .changelink = ip6gre_changelink,
2336 .get_size = ip6gre_get_size,
2337 .fill_info = ip6gre_fill_info,
2338 .get_link_net = ip6_tnl_get_link_net,
2339 };
2340
2341 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2342 .kind = "ip6erspan",
2343 .maxtype = IFLA_GRE_MAX,
2344 .policy = ip6gre_policy,
2345 .priv_size = sizeof(struct ip6_tnl),
2346 .setup = ip6erspan_tap_setup,
2347 .validate = ip6erspan_tap_validate,
2348 .newlink = ip6erspan_newlink,
2349 .changelink = ip6erspan_changelink,
2350 .get_size = ip6gre_get_size,
2351 .fill_info = ip6gre_fill_info,
2352 .get_link_net = ip6_tnl_get_link_net,
2353 };
2354
2355 /*
2356 * And now the modules code and kernel interface.
2357 */
2358
ip6gre_init(void)2359 static int __init ip6gre_init(void)
2360 {
2361 int err;
2362
2363 pr_info("GRE over IPv6 tunneling driver\n");
2364
2365 err = register_pernet_device(&ip6gre_net_ops);
2366 if (err < 0)
2367 return err;
2368
2369 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2370 if (err < 0) {
2371 pr_info("%s: can't add protocol\n", __func__);
2372 goto add_proto_failed;
2373 }
2374
2375 err = rtnl_link_register(&ip6gre_link_ops);
2376 if (err < 0)
2377 goto rtnl_link_failed;
2378
2379 err = rtnl_link_register(&ip6gre_tap_ops);
2380 if (err < 0)
2381 goto tap_ops_failed;
2382
2383 err = rtnl_link_register(&ip6erspan_tap_ops);
2384 if (err < 0)
2385 goto erspan_link_failed;
2386
2387 out:
2388 return err;
2389
2390 erspan_link_failed:
2391 rtnl_link_unregister(&ip6gre_tap_ops);
2392 tap_ops_failed:
2393 rtnl_link_unregister(&ip6gre_link_ops);
2394 rtnl_link_failed:
2395 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2396 add_proto_failed:
2397 unregister_pernet_device(&ip6gre_net_ops);
2398 goto out;
2399 }
2400
ip6gre_fini(void)2401 static void __exit ip6gre_fini(void)
2402 {
2403 rtnl_link_unregister(&ip6gre_tap_ops);
2404 rtnl_link_unregister(&ip6gre_link_ops);
2405 rtnl_link_unregister(&ip6erspan_tap_ops);
2406 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2407 unregister_pernet_device(&ip6gre_net_ops);
2408 }
2409
2410 module_init(ip6gre_init);
2411 module_exit(ip6gre_fini);
2412 MODULE_LICENSE("GPL");
2413 MODULE_AUTHOR("D. Kozlov <xeb@mail.ru>");
2414 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2415 MODULE_ALIAS_RTNL_LINK("ip6gre");
2416 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2417 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2418 MODULE_ALIAS_NETDEV("ip6gre0");
2419