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/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 /* Tunnel hash table */
83
84 /*
85 4 hash tables:
86
87 3: (remote,local)
88 2: (remote,*)
89 1: (*,local)
90 0: (*,*)
91
92 We require exact key match i.e. if a key is present in packet
93 it will match only tunnel with the same key; if it is not present,
94 it will match only keyless tunnel.
95
96 All keysless packets, if not matched configured keyless tunnels
97 will match fallback tunnel.
98 */
99
100 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
HASH_ADDR(const struct in6_addr * addr)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 /* Given src, dst and key, find appropriate for input tunnel. */
114
ip6gre_tunnel_lookup(struct net_device * dev,const struct in6_addr * remote,const struct in6_addr * local,__be32 key,__be16 gre_proto)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 struct net_device *ndev;
131
132 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
133 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
134 !ipv6_addr_equal(remote, &t->parms.raddr) ||
135 key != t->parms.i_key ||
136 !(t->dev->flags & IFF_UP))
137 continue;
138
139 if (t->dev->type != ARPHRD_IP6GRE &&
140 t->dev->type != dev_type)
141 continue;
142
143 score = 0;
144 if (t->parms.link != link)
145 score |= 1;
146 if (t->dev->type != dev_type)
147 score |= 2;
148 if (score == 0)
149 return t;
150
151 if (score < cand_score) {
152 cand = t;
153 cand_score = score;
154 }
155 }
156
157 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
158 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
159 key != t->parms.i_key ||
160 !(t->dev->flags & IFF_UP))
161 continue;
162
163 if (t->dev->type != ARPHRD_IP6GRE &&
164 t->dev->type != dev_type)
165 continue;
166
167 score = 0;
168 if (t->parms.link != link)
169 score |= 1;
170 if (t->dev->type != dev_type)
171 score |= 2;
172 if (score == 0)
173 return t;
174
175 if (score < cand_score) {
176 cand = t;
177 cand_score = score;
178 }
179 }
180
181 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
182 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
183 (!ipv6_addr_equal(local, &t->parms.raddr) ||
184 !ipv6_addr_is_multicast(local))) ||
185 key != t->parms.i_key ||
186 !(t->dev->flags & IFF_UP))
187 continue;
188
189 if (t->dev->type != ARPHRD_IP6GRE &&
190 t->dev->type != dev_type)
191 continue;
192
193 score = 0;
194 if (t->parms.link != link)
195 score |= 1;
196 if (t->dev->type != dev_type)
197 score |= 2;
198 if (score == 0)
199 return t;
200
201 if (score < cand_score) {
202 cand = t;
203 cand_score = score;
204 }
205 }
206
207 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
208 if (t->parms.i_key != key ||
209 !(t->dev->flags & IFF_UP))
210 continue;
211
212 if (t->dev->type != ARPHRD_IP6GRE &&
213 t->dev->type != dev_type)
214 continue;
215
216 score = 0;
217 if (t->parms.link != link)
218 score |= 1;
219 if (t->dev->type != dev_type)
220 score |= 2;
221 if (score == 0)
222 return t;
223
224 if (score < cand_score) {
225 cand = t;
226 cand_score = score;
227 }
228 }
229
230 if (cand)
231 return cand;
232
233 if (gre_proto == htons(ETH_P_ERSPAN) ||
234 gre_proto == htons(ETH_P_ERSPAN2))
235 t = rcu_dereference(ign->collect_md_tun_erspan);
236 else
237 t = rcu_dereference(ign->collect_md_tun);
238
239 if (t && t->dev->flags & IFF_UP)
240 return t;
241
242 ndev = READ_ONCE(ign->fb_tunnel_dev);
243 if (ndev && ndev->flags & IFF_UP)
244 return netdev_priv(ndev);
245
246 return NULL;
247 }
248
__ip6gre_bucket(struct ip6gre_net * ign,const struct __ip6_tnl_parm * p)249 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
250 const struct __ip6_tnl_parm *p)
251 {
252 const struct in6_addr *remote = &p->raddr;
253 const struct in6_addr *local = &p->laddr;
254 unsigned int h = HASH_KEY(p->i_key);
255 int prio = 0;
256
257 if (!ipv6_addr_any(local))
258 prio |= 1;
259 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
260 prio |= 2;
261 h ^= HASH_ADDR(remote);
262 }
263
264 return &ign->tunnels[prio][h];
265 }
266
ip6gre_tunnel_link_md(struct ip6gre_net * ign,struct ip6_tnl * t)267 static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
268 {
269 if (t->parms.collect_md)
270 rcu_assign_pointer(ign->collect_md_tun, t);
271 }
272
ip6erspan_tunnel_link_md(struct ip6gre_net * ign,struct ip6_tnl * t)273 static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
274 {
275 if (t->parms.collect_md)
276 rcu_assign_pointer(ign->collect_md_tun_erspan, t);
277 }
278
ip6gre_tunnel_unlink_md(struct ip6gre_net * ign,struct ip6_tnl * t)279 static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t)
280 {
281 if (t->parms.collect_md)
282 rcu_assign_pointer(ign->collect_md_tun, NULL);
283 }
284
ip6erspan_tunnel_unlink_md(struct ip6gre_net * ign,struct ip6_tnl * t)285 static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign,
286 struct ip6_tnl *t)
287 {
288 if (t->parms.collect_md)
289 rcu_assign_pointer(ign->collect_md_tun_erspan, NULL);
290 }
291
ip6gre_bucket(struct ip6gre_net * ign,const struct ip6_tnl * t)292 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
293 const struct ip6_tnl *t)
294 {
295 return __ip6gre_bucket(ign, &t->parms);
296 }
297
ip6gre_tunnel_link(struct ip6gre_net * ign,struct ip6_tnl * t)298 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
299 {
300 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
301
302 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
303 rcu_assign_pointer(*tp, t);
304 }
305
ip6gre_tunnel_unlink(struct ip6gre_net * ign,struct ip6_tnl * t)306 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
307 {
308 struct ip6_tnl __rcu **tp;
309 struct ip6_tnl *iter;
310
311 for (tp = ip6gre_bucket(ign, t);
312 (iter = rtnl_dereference(*tp)) != NULL;
313 tp = &iter->next) {
314 if (t == iter) {
315 rcu_assign_pointer(*tp, t->next);
316 break;
317 }
318 }
319 }
320
ip6gre_tunnel_find(struct net * net,const struct __ip6_tnl_parm * parms,int type)321 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
322 const struct __ip6_tnl_parm *parms,
323 int type)
324 {
325 const struct in6_addr *remote = &parms->raddr;
326 const struct in6_addr *local = &parms->laddr;
327 __be32 key = parms->i_key;
328 int link = parms->link;
329 struct ip6_tnl *t;
330 struct ip6_tnl __rcu **tp;
331 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
332
333 for (tp = __ip6gre_bucket(ign, parms);
334 (t = rtnl_dereference(*tp)) != NULL;
335 tp = &t->next)
336 if (ipv6_addr_equal(local, &t->parms.laddr) &&
337 ipv6_addr_equal(remote, &t->parms.raddr) &&
338 key == t->parms.i_key &&
339 link == t->parms.link &&
340 type == t->dev->type)
341 break;
342
343 return t;
344 }
345
ip6gre_tunnel_locate(struct net * net,const struct __ip6_tnl_parm * parms,int create)346 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
347 const struct __ip6_tnl_parm *parms, int create)
348 {
349 struct ip6_tnl *t, *nt;
350 struct net_device *dev;
351 char name[IFNAMSIZ];
352 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
353
354 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
355 if (t && create)
356 return NULL;
357 if (t || !create)
358 return t;
359
360 if (parms->name[0]) {
361 if (!dev_valid_name(parms->name))
362 return NULL;
363 strscpy(name, parms->name, IFNAMSIZ);
364 } else {
365 strcpy(name, "ip6gre%d");
366 }
367 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
368 ip6gre_tunnel_setup);
369 if (!dev)
370 return NULL;
371
372 dev_net_set(dev, net);
373
374 nt = netdev_priv(dev);
375 nt->parms = *parms;
376 dev->rtnl_link_ops = &ip6gre_link_ops;
377
378 nt->dev = dev;
379 nt->net = dev_net(dev);
380
381 if (register_netdevice(dev) < 0)
382 goto failed_free;
383
384 ip6gre_tnl_link_config(nt, 1);
385 ip6gre_tunnel_link(ign, nt);
386 return nt;
387
388 failed_free:
389 free_netdev(dev);
390 return NULL;
391 }
392
ip6erspan_tunnel_uninit(struct net_device * dev)393 static void ip6erspan_tunnel_uninit(struct net_device *dev)
394 {
395 struct ip6_tnl *t = netdev_priv(dev);
396 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
397
398 ip6erspan_tunnel_unlink_md(ign, t);
399 ip6gre_tunnel_unlink(ign, t);
400 dst_cache_reset(&t->dst_cache);
401 netdev_put(dev, &t->dev_tracker);
402 }
403
ip6gre_tunnel_uninit(struct net_device * dev)404 static void ip6gre_tunnel_uninit(struct net_device *dev)
405 {
406 struct ip6_tnl *t = netdev_priv(dev);
407 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
408
409 ip6gre_tunnel_unlink_md(ign, t);
410 ip6gre_tunnel_unlink(ign, t);
411 if (ign->fb_tunnel_dev == dev)
412 WRITE_ONCE(ign->fb_tunnel_dev, NULL);
413 dst_cache_reset(&t->dst_cache);
414 netdev_put(dev, &t->dev_tracker);
415 }
416
417
ip6gre_err(struct sk_buff * skb,struct inet6_skb_parm * opt,u8 type,u8 code,int offset,__be32 info)418 static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
419 u8 type, u8 code, int offset, __be32 info)
420 {
421 struct net *net = dev_net(skb->dev);
422 const struct ipv6hdr *ipv6h;
423 struct tnl_ptk_info tpi;
424 struct ip6_tnl *t;
425
426 if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6),
427 offset) < 0)
428 return -EINVAL;
429
430 ipv6h = (const struct ipv6hdr *)skb->data;
431 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
432 tpi.key, tpi.proto);
433 if (!t)
434 return -ENOENT;
435
436 switch (type) {
437 case ICMPV6_DEST_UNREACH:
438 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
439 t->parms.name);
440 if (code != ICMPV6_PORT_UNREACH)
441 break;
442 return 0;
443 case ICMPV6_TIME_EXCEED:
444 if (code == ICMPV6_EXC_HOPLIMIT) {
445 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
446 t->parms.name);
447 break;
448 }
449 return 0;
450 case ICMPV6_PARAMPROB: {
451 struct ipv6_tlv_tnl_enc_lim *tel;
452 __u32 teli;
453
454 teli = 0;
455 if (code == ICMPV6_HDR_FIELD)
456 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
457
458 if (teli && teli == be32_to_cpu(info) - 2) {
459 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
460 if (tel->encap_limit == 0) {
461 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
462 t->parms.name);
463 }
464 } else {
465 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
466 t->parms.name);
467 }
468 return 0;
469 }
470 case ICMPV6_PKT_TOOBIG:
471 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
472 return 0;
473 case NDISC_REDIRECT:
474 ip6_redirect(skb, net, skb->dev->ifindex, 0,
475 sock_net_uid(net, NULL));
476 return 0;
477 }
478
479 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
480 t->err_count++;
481 else
482 t->err_count = 1;
483 t->err_time = jiffies;
484
485 return 0;
486 }
487
ip6gre_rcv(struct sk_buff * skb,const struct tnl_ptk_info * tpi)488 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
489 {
490 const struct ipv6hdr *ipv6h;
491 struct ip6_tnl *tunnel;
492
493 ipv6h = ipv6_hdr(skb);
494 tunnel = ip6gre_tunnel_lookup(skb->dev,
495 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
496 tpi->proto);
497 if (tunnel) {
498 if (tunnel->parms.collect_md) {
499 struct metadata_dst *tun_dst;
500 __be64 tun_id;
501 __be16 flags;
502
503 flags = tpi->flags;
504 tun_id = key32_to_tunnel_id(tpi->key);
505
506 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
507 if (!tun_dst)
508 return PACKET_REJECT;
509
510 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
511 } else {
512 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
513 }
514
515 return PACKET_RCVD;
516 }
517
518 return PACKET_REJECT;
519 }
520
ip6erspan_rcv(struct sk_buff * skb,struct tnl_ptk_info * tpi,int gre_hdr_len)521 static int ip6erspan_rcv(struct sk_buff *skb,
522 struct tnl_ptk_info *tpi,
523 int gre_hdr_len)
524 {
525 struct erspan_base_hdr *ershdr;
526 const struct ipv6hdr *ipv6h;
527 struct erspan_md2 *md2;
528 struct ip6_tnl *tunnel;
529 u8 ver;
530
531 ipv6h = ipv6_hdr(skb);
532 ershdr = (struct erspan_base_hdr *)skb->data;
533 ver = ershdr->ver;
534
535 tunnel = ip6gre_tunnel_lookup(skb->dev,
536 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
537 tpi->proto);
538 if (tunnel) {
539 int len = erspan_hdr_len(ver);
540
541 if (unlikely(!pskb_may_pull(skb, len)))
542 return PACKET_REJECT;
543
544 if (__iptunnel_pull_header(skb, len,
545 htons(ETH_P_TEB),
546 false, false) < 0)
547 return PACKET_REJECT;
548
549 if (tunnel->parms.collect_md) {
550 struct erspan_metadata *pkt_md, *md;
551 struct metadata_dst *tun_dst;
552 struct ip_tunnel_info *info;
553 unsigned char *gh;
554 __be64 tun_id;
555 __be16 flags;
556
557 tpi->flags |= TUNNEL_KEY;
558 flags = tpi->flags;
559 tun_id = key32_to_tunnel_id(tpi->key);
560
561 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
562 sizeof(*md));
563 if (!tun_dst)
564 return PACKET_REJECT;
565
566 /* skb can be uncloned in __iptunnel_pull_header, so
567 * old pkt_md is no longer valid and we need to reset
568 * it
569 */
570 gh = skb_network_header(skb) +
571 skb_network_header_len(skb);
572 pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len +
573 sizeof(*ershdr));
574 info = &tun_dst->u.tun_info;
575 md = ip_tunnel_info_opts(info);
576 md->version = ver;
577 md2 = &md->u.md2;
578 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
579 ERSPAN_V2_MDSIZE);
580 info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
581 info->options_len = sizeof(*md);
582
583 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
584
585 } else {
586 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
587 }
588
589 return PACKET_RCVD;
590 }
591
592 return PACKET_REJECT;
593 }
594
gre_rcv(struct sk_buff * skb)595 static int gre_rcv(struct sk_buff *skb)
596 {
597 struct tnl_ptk_info tpi;
598 bool csum_err = false;
599 int hdr_len;
600
601 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
602 if (hdr_len < 0)
603 goto drop;
604
605 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
606 goto drop;
607
608 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
609 tpi.proto == htons(ETH_P_ERSPAN2))) {
610 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
611 return 0;
612 goto out;
613 }
614
615 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
616 return 0;
617
618 out:
619 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
620 drop:
621 kfree_skb(skb);
622 return 0;
623 }
624
gre_handle_offloads(struct sk_buff * skb,bool csum)625 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
626 {
627 return iptunnel_handle_offloads(skb,
628 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
629 }
630
prepare_ip6gre_xmit_ipv4(struct sk_buff * skb,struct net_device * dev,struct flowi6 * fl6,__u8 * dsfield,int * encap_limit)631 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
632 struct net_device *dev,
633 struct flowi6 *fl6, __u8 *dsfield,
634 int *encap_limit)
635 {
636 const struct iphdr *iph = ip_hdr(skb);
637 struct ip6_tnl *t = netdev_priv(dev);
638
639 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
640 *encap_limit = t->parms.encap_limit;
641
642 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
643
644 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
645 *dsfield = ipv4_get_dsfield(iph);
646 else
647 *dsfield = ip6_tclass(t->parms.flowinfo);
648
649 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
650 fl6->flowi6_mark = skb->mark;
651 else
652 fl6->flowi6_mark = t->parms.fwmark;
653
654 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
655 }
656
prepare_ip6gre_xmit_ipv6(struct sk_buff * skb,struct net_device * dev,struct flowi6 * fl6,__u8 * dsfield,int * encap_limit)657 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
658 struct net_device *dev,
659 struct flowi6 *fl6, __u8 *dsfield,
660 int *encap_limit)
661 {
662 struct ipv6hdr *ipv6h;
663 struct ip6_tnl *t = netdev_priv(dev);
664 __u16 offset;
665
666 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
667 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
668 ipv6h = ipv6_hdr(skb);
669
670 if (offset > 0) {
671 struct ipv6_tlv_tnl_enc_lim *tel;
672
673 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
674 if (tel->encap_limit == 0) {
675 icmpv6_ndo_send(skb, ICMPV6_PARAMPROB,
676 ICMPV6_HDR_FIELD, offset + 2);
677 return -1;
678 }
679 *encap_limit = tel->encap_limit - 1;
680 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
681 *encap_limit = t->parms.encap_limit;
682 }
683
684 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
685
686 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
687 *dsfield = ipv6_get_dsfield(ipv6h);
688 else
689 *dsfield = ip6_tclass(t->parms.flowinfo);
690
691 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
692 fl6->flowlabel |= ip6_flowlabel(ipv6h);
693
694 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
695 fl6->flowi6_mark = skb->mark;
696 else
697 fl6->flowi6_mark = t->parms.fwmark;
698
699 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
700
701 return 0;
702 }
703
prepare_ip6gre_xmit_other(struct sk_buff * skb,struct net_device * dev,struct flowi6 * fl6,__u8 * dsfield,int * encap_limit)704 static int prepare_ip6gre_xmit_other(struct sk_buff *skb,
705 struct net_device *dev,
706 struct flowi6 *fl6, __u8 *dsfield,
707 int *encap_limit)
708 {
709 struct ip6_tnl *t = netdev_priv(dev);
710
711 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
712 *encap_limit = t->parms.encap_limit;
713
714 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
715
716 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
717 *dsfield = 0;
718 else
719 *dsfield = ip6_tclass(t->parms.flowinfo);
720
721 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
722 fl6->flowi6_mark = skb->mark;
723 else
724 fl6->flowi6_mark = t->parms.fwmark;
725
726 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
727
728 return 0;
729 }
730
skb_tunnel_info_txcheck(struct sk_buff * skb)731 static struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb)
732 {
733 struct ip_tunnel_info *tun_info;
734
735 tun_info = skb_tunnel_info(skb);
736 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX)))
737 return ERR_PTR(-EINVAL);
738
739 return tun_info;
740 }
741
__gre6_xmit(struct sk_buff * skb,struct net_device * dev,__u8 dsfield,struct flowi6 * fl6,int encap_limit,__u32 * pmtu,__be16 proto)742 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
743 struct net_device *dev, __u8 dsfield,
744 struct flowi6 *fl6, int encap_limit,
745 __u32 *pmtu, __be16 proto)
746 {
747 struct ip6_tnl *tunnel = netdev_priv(dev);
748 __be16 protocol;
749 __be16 flags;
750
751 if (dev->type == ARPHRD_ETHER)
752 IPCB(skb)->flags = 0;
753
754 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
755 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
756 else
757 fl6->daddr = tunnel->parms.raddr;
758
759 /* Push GRE header. */
760 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
761
762 if (tunnel->parms.collect_md) {
763 struct ip_tunnel_info *tun_info;
764 const struct ip_tunnel_key *key;
765 int tun_hlen;
766
767 tun_info = skb_tunnel_info_txcheck(skb);
768 if (IS_ERR(tun_info) ||
769 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
770 return -EINVAL;
771
772 key = &tun_info->key;
773 memset(fl6, 0, sizeof(*fl6));
774 fl6->flowi6_proto = IPPROTO_GRE;
775 fl6->daddr = key->u.ipv6.dst;
776 fl6->flowlabel = key->label;
777 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
778 fl6->fl6_gre_key = tunnel_id_to_key32(key->tun_id);
779
780 dsfield = key->tos;
781 flags = key->tun_flags &
782 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
783 tun_hlen = gre_calc_hlen(flags);
784
785 if (skb_cow_head(skb, dev->needed_headroom ?: tun_hlen + tunnel->encap_hlen))
786 return -ENOMEM;
787
788 gre_build_header(skb, tun_hlen,
789 flags, protocol,
790 tunnel_id_to_key32(tun_info->key.tun_id),
791 (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno))
792 : 0);
793
794 } else {
795 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
796 return -ENOMEM;
797
798 flags = tunnel->parms.o_flags;
799
800 gre_build_header(skb, tunnel->tun_hlen, flags,
801 protocol, tunnel->parms.o_key,
802 (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno))
803 : 0);
804 }
805
806 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
807 NEXTHDR_GRE);
808 }
809
ip6gre_xmit_ipv4(struct sk_buff * skb,struct net_device * dev)810 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
811 {
812 struct ip6_tnl *t = netdev_priv(dev);
813 int encap_limit = -1;
814 struct flowi6 fl6;
815 __u8 dsfield = 0;
816 __u32 mtu;
817 int err;
818
819 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
820
821 if (!t->parms.collect_md)
822 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
823 &dsfield, &encap_limit);
824
825 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
826 if (err)
827 return -1;
828
829 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
830 skb->protocol);
831 if (err != 0) {
832 /* XXX: send ICMP error even if DF is not set. */
833 if (err == -EMSGSIZE)
834 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
835 htonl(mtu));
836 return -1;
837 }
838
839 return 0;
840 }
841
ip6gre_xmit_ipv6(struct sk_buff * skb,struct net_device * dev)842 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
843 {
844 struct ip6_tnl *t = netdev_priv(dev);
845 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
846 int encap_limit = -1;
847 struct flowi6 fl6;
848 __u8 dsfield = 0;
849 __u32 mtu;
850 int err;
851
852 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
853 return -1;
854
855 if (!t->parms.collect_md &&
856 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
857 return -1;
858
859 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
860 return -1;
861
862 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
863 &mtu, skb->protocol);
864 if (err != 0) {
865 if (err == -EMSGSIZE)
866 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
867 return -1;
868 }
869
870 return 0;
871 }
872
873 /**
874 * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own
875 * @t: the outgoing tunnel device
876 * @hdr: IPv6 header from the incoming packet
877 *
878 * Description:
879 * Avoid trivial tunneling loop by checking that tunnel exit-point
880 * doesn't match source of incoming packet.
881 *
882 * Return:
883 * 1 if conflict,
884 * 0 else
885 **/
886
ip6gre_tnl_addr_conflict(const struct ip6_tnl * t,const struct ipv6hdr * hdr)887 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
888 const struct ipv6hdr *hdr)
889 {
890 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
891 }
892
ip6gre_xmit_other(struct sk_buff * skb,struct net_device * dev)893 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
894 {
895 struct ip6_tnl *t = netdev_priv(dev);
896 int encap_limit = -1;
897 struct flowi6 fl6;
898 __u8 dsfield = 0;
899 __u32 mtu;
900 int err;
901
902 if (!t->parms.collect_md &&
903 prepare_ip6gre_xmit_other(skb, dev, &fl6, &dsfield, &encap_limit))
904 return -1;
905
906 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
907 if (err)
908 return err;
909 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, skb->protocol);
910
911 return err;
912 }
913
ip6gre_tunnel_xmit(struct sk_buff * skb,struct net_device * dev)914 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
915 struct net_device *dev)
916 {
917 struct ip6_tnl *t = netdev_priv(dev);
918 struct net_device_stats *stats = &t->dev->stats;
919 __be16 payload_protocol;
920 int ret;
921
922 if (!pskb_inet_may_pull(skb))
923 goto tx_err;
924
925 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
926 goto tx_err;
927
928 payload_protocol = skb_protocol(skb, true);
929 switch (payload_protocol) {
930 case htons(ETH_P_IP):
931 ret = ip6gre_xmit_ipv4(skb, dev);
932 break;
933 case htons(ETH_P_IPV6):
934 ret = ip6gre_xmit_ipv6(skb, dev);
935 break;
936 default:
937 ret = ip6gre_xmit_other(skb, dev);
938 break;
939 }
940
941 if (ret < 0)
942 goto tx_err;
943
944 return NETDEV_TX_OK;
945
946 tx_err:
947 if (!t->parms.collect_md || !IS_ERR(skb_tunnel_info_txcheck(skb)))
948 stats->tx_errors++;
949 stats->tx_dropped++;
950 kfree_skb(skb);
951 return NETDEV_TX_OK;
952 }
953
ip6erspan_tunnel_xmit(struct sk_buff * skb,struct net_device * dev)954 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
955 struct net_device *dev)
956 {
957 struct ip_tunnel_info *tun_info = NULL;
958 struct ip6_tnl *t = netdev_priv(dev);
959 struct dst_entry *dst = skb_dst(skb);
960 struct net_device_stats *stats;
961 bool truncate = false;
962 int encap_limit = -1;
963 __u8 dsfield = false;
964 struct flowi6 fl6;
965 int err = -EINVAL;
966 __be16 proto;
967 __u32 mtu;
968 int nhoff;
969
970 if (!pskb_inet_may_pull(skb))
971 goto tx_err;
972
973 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
974 goto tx_err;
975
976 if (gre_handle_offloads(skb, false))
977 goto tx_err;
978
979 if (skb->len > dev->mtu + dev->hard_header_len) {
980 pskb_trim(skb, dev->mtu + dev->hard_header_len);
981 truncate = true;
982 }
983
984 nhoff = skb_network_header(skb) - skb_mac_header(skb);
985 if (skb->protocol == htons(ETH_P_IP) &&
986 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
987 truncate = true;
988
989 if (skb->protocol == htons(ETH_P_IPV6)) {
990 int thoff;
991
992 if (skb_transport_header_was_set(skb))
993 thoff = skb_transport_header(skb) - skb_mac_header(skb);
994 else
995 thoff = nhoff + sizeof(struct ipv6hdr);
996 if (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)
997 truncate = true;
998 }
999
1000 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
1001 goto tx_err;
1002
1003 t->parms.o_flags &= ~TUNNEL_KEY;
1004 IPCB(skb)->flags = 0;
1005
1006 /* For collect_md mode, derive fl6 from the tunnel key,
1007 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
1008 */
1009 if (t->parms.collect_md) {
1010 const struct ip_tunnel_key *key;
1011 struct erspan_metadata *md;
1012 __be32 tun_id;
1013
1014 tun_info = skb_tunnel_info_txcheck(skb);
1015 if (IS_ERR(tun_info) ||
1016 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
1017 goto tx_err;
1018
1019 key = &tun_info->key;
1020 memset(&fl6, 0, sizeof(fl6));
1021 fl6.flowi6_proto = IPPROTO_GRE;
1022 fl6.daddr = key->u.ipv6.dst;
1023 fl6.flowlabel = key->label;
1024 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1025 fl6.fl6_gre_key = tunnel_id_to_key32(key->tun_id);
1026
1027 dsfield = key->tos;
1028 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
1029 goto tx_err;
1030 if (tun_info->options_len < sizeof(*md))
1031 goto tx_err;
1032 md = ip_tunnel_info_opts(tun_info);
1033
1034 tun_id = tunnel_id_to_key32(key->tun_id);
1035 if (md->version == 1) {
1036 erspan_build_header(skb,
1037 ntohl(tun_id),
1038 ntohl(md->u.index), truncate,
1039 false);
1040 } else if (md->version == 2) {
1041 erspan_build_header_v2(skb,
1042 ntohl(tun_id),
1043 md->u.md2.dir,
1044 get_hwid(&md->u.md2),
1045 truncate, false);
1046 } else {
1047 goto tx_err;
1048 }
1049 } else {
1050 switch (skb->protocol) {
1051 case htons(ETH_P_IP):
1052 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1053 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1054 &dsfield, &encap_limit);
1055 break;
1056 case htons(ETH_P_IPV6):
1057 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1058 goto tx_err;
1059 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1060 &dsfield, &encap_limit))
1061 goto tx_err;
1062 break;
1063 default:
1064 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1065 break;
1066 }
1067
1068 if (t->parms.erspan_ver == 1)
1069 erspan_build_header(skb, ntohl(t->parms.o_key),
1070 t->parms.index,
1071 truncate, false);
1072 else if (t->parms.erspan_ver == 2)
1073 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1074 t->parms.dir,
1075 t->parms.hwid,
1076 truncate, false);
1077 else
1078 goto tx_err;
1079
1080 fl6.daddr = t->parms.raddr;
1081 }
1082
1083 /* Push GRE header. */
1084 proto = (t->parms.erspan_ver == 1) ? htons(ETH_P_ERSPAN)
1085 : htons(ETH_P_ERSPAN2);
1086 gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(atomic_fetch_inc(&t->o_seqno)));
1087
1088 /* TooBig packet may have updated dst->dev's mtu */
1089 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1090 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false);
1091
1092 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1093 NEXTHDR_GRE);
1094 if (err != 0) {
1095 /* XXX: send ICMP error even if DF is not set. */
1096 if (err == -EMSGSIZE) {
1097 if (skb->protocol == htons(ETH_P_IP))
1098 icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1099 ICMP_FRAG_NEEDED, htonl(mtu));
1100 else
1101 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1102 }
1103
1104 goto tx_err;
1105 }
1106 return NETDEV_TX_OK;
1107
1108 tx_err:
1109 stats = &t->dev->stats;
1110 if (!IS_ERR(tun_info))
1111 stats->tx_errors++;
1112 stats->tx_dropped++;
1113 kfree_skb(skb);
1114 return NETDEV_TX_OK;
1115 }
1116
ip6gre_tnl_link_config_common(struct ip6_tnl * t)1117 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1118 {
1119 struct net_device *dev = t->dev;
1120 struct __ip6_tnl_parm *p = &t->parms;
1121 struct flowi6 *fl6 = &t->fl.u.ip6;
1122
1123 if (dev->type != ARPHRD_ETHER) {
1124 __dev_addr_set(dev, &p->laddr, sizeof(struct in6_addr));
1125 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1126 }
1127
1128 /* Set up flowi template */
1129 fl6->saddr = p->laddr;
1130 fl6->daddr = p->raddr;
1131 fl6->flowi6_oif = p->link;
1132 fl6->flowlabel = 0;
1133 fl6->flowi6_proto = IPPROTO_GRE;
1134 fl6->fl6_gre_key = t->parms.o_key;
1135
1136 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1137 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1138 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1139 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1140
1141 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1142 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1143
1144 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1145 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1146 dev->flags |= IFF_POINTOPOINT;
1147 else
1148 dev->flags &= ~IFF_POINTOPOINT;
1149 }
1150
ip6gre_tnl_link_config_route(struct ip6_tnl * t,int set_mtu,int t_hlen)1151 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1152 int t_hlen)
1153 {
1154 const struct __ip6_tnl_parm *p = &t->parms;
1155 struct net_device *dev = t->dev;
1156
1157 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1158 int strict = (ipv6_addr_type(&p->raddr) &
1159 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1160
1161 struct rt6_info *rt = rt6_lookup(t->net,
1162 &p->raddr, &p->laddr,
1163 p->link, NULL, strict);
1164
1165 if (!rt)
1166 return;
1167
1168 if (rt->dst.dev) {
1169 unsigned short dst_len = rt->dst.dev->hard_header_len +
1170 t_hlen;
1171
1172 if (t->dev->header_ops)
1173 dev->hard_header_len = dst_len;
1174 else
1175 dev->needed_headroom = dst_len;
1176
1177 if (set_mtu) {
1178 int mtu = rt->dst.dev->mtu - t_hlen;
1179
1180 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1181 mtu -= 8;
1182 if (dev->type == ARPHRD_ETHER)
1183 mtu -= ETH_HLEN;
1184
1185 if (mtu < IPV6_MIN_MTU)
1186 mtu = IPV6_MIN_MTU;
1187 WRITE_ONCE(dev->mtu, mtu);
1188 }
1189 }
1190 ip6_rt_put(rt);
1191 }
1192 }
1193
ip6gre_calc_hlen(struct ip6_tnl * tunnel)1194 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1195 {
1196 int t_hlen;
1197
1198 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1199 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1200
1201 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1202
1203 if (tunnel->dev->header_ops)
1204 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1205 else
1206 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1207
1208 return t_hlen;
1209 }
1210
ip6gre_tnl_link_config(struct ip6_tnl * t,int set_mtu)1211 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1212 {
1213 ip6gre_tnl_link_config_common(t);
1214 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1215 }
1216
ip6gre_tnl_copy_tnl_parm(struct ip6_tnl * t,const struct __ip6_tnl_parm * p)1217 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1218 const struct __ip6_tnl_parm *p)
1219 {
1220 t->parms.laddr = p->laddr;
1221 t->parms.raddr = p->raddr;
1222 t->parms.flags = p->flags;
1223 t->parms.hop_limit = p->hop_limit;
1224 t->parms.encap_limit = p->encap_limit;
1225 t->parms.flowinfo = p->flowinfo;
1226 t->parms.link = p->link;
1227 t->parms.proto = p->proto;
1228 t->parms.i_key = p->i_key;
1229 t->parms.o_key = p->o_key;
1230 t->parms.i_flags = p->i_flags;
1231 t->parms.o_flags = p->o_flags;
1232 t->parms.fwmark = p->fwmark;
1233 t->parms.erspan_ver = p->erspan_ver;
1234 t->parms.index = p->index;
1235 t->parms.dir = p->dir;
1236 t->parms.hwid = p->hwid;
1237 dst_cache_reset(&t->dst_cache);
1238 }
1239
ip6gre_tnl_change(struct ip6_tnl * t,const struct __ip6_tnl_parm * p,int set_mtu)1240 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1241 int set_mtu)
1242 {
1243 ip6gre_tnl_copy_tnl_parm(t, p);
1244 ip6gre_tnl_link_config(t, set_mtu);
1245 return 0;
1246 }
1247
ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm * p,const struct ip6_tnl_parm2 * u)1248 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1249 const struct ip6_tnl_parm2 *u)
1250 {
1251 p->laddr = u->laddr;
1252 p->raddr = u->raddr;
1253 p->flags = u->flags;
1254 p->hop_limit = u->hop_limit;
1255 p->encap_limit = u->encap_limit;
1256 p->flowinfo = u->flowinfo;
1257 p->link = u->link;
1258 p->i_key = u->i_key;
1259 p->o_key = u->o_key;
1260 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1261 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1262 memcpy(p->name, u->name, sizeof(u->name));
1263 }
1264
ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 * u,const struct __ip6_tnl_parm * p)1265 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1266 const struct __ip6_tnl_parm *p)
1267 {
1268 u->proto = IPPROTO_GRE;
1269 u->laddr = p->laddr;
1270 u->raddr = p->raddr;
1271 u->flags = p->flags;
1272 u->hop_limit = p->hop_limit;
1273 u->encap_limit = p->encap_limit;
1274 u->flowinfo = p->flowinfo;
1275 u->link = p->link;
1276 u->i_key = p->i_key;
1277 u->o_key = p->o_key;
1278 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1279 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1280 memcpy(u->name, p->name, sizeof(u->name));
1281 }
1282
ip6gre_tunnel_siocdevprivate(struct net_device * dev,struct ifreq * ifr,void __user * data,int cmd)1283 static int ip6gre_tunnel_siocdevprivate(struct net_device *dev,
1284 struct ifreq *ifr, void __user *data,
1285 int cmd)
1286 {
1287 int err = 0;
1288 struct ip6_tnl_parm2 p;
1289 struct __ip6_tnl_parm p1;
1290 struct ip6_tnl *t = netdev_priv(dev);
1291 struct net *net = t->net;
1292 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1293
1294 memset(&p1, 0, sizeof(p1));
1295
1296 switch (cmd) {
1297 case SIOCGETTUNNEL:
1298 if (dev == ign->fb_tunnel_dev) {
1299 if (copy_from_user(&p, data, sizeof(p))) {
1300 err = -EFAULT;
1301 break;
1302 }
1303 ip6gre_tnl_parm_from_user(&p1, &p);
1304 t = ip6gre_tunnel_locate(net, &p1, 0);
1305 if (!t)
1306 t = netdev_priv(dev);
1307 }
1308 memset(&p, 0, sizeof(p));
1309 ip6gre_tnl_parm_to_user(&p, &t->parms);
1310 if (copy_to_user(data, &p, sizeof(p)))
1311 err = -EFAULT;
1312 break;
1313
1314 case SIOCADDTUNNEL:
1315 case SIOCCHGTUNNEL:
1316 err = -EPERM;
1317 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1318 goto done;
1319
1320 err = -EFAULT;
1321 if (copy_from_user(&p, data, sizeof(p)))
1322 goto done;
1323
1324 err = -EINVAL;
1325 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1326 goto done;
1327
1328 if (!(p.i_flags&GRE_KEY))
1329 p.i_key = 0;
1330 if (!(p.o_flags&GRE_KEY))
1331 p.o_key = 0;
1332
1333 ip6gre_tnl_parm_from_user(&p1, &p);
1334 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1335
1336 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1337 if (t) {
1338 if (t->dev != dev) {
1339 err = -EEXIST;
1340 break;
1341 }
1342 } else {
1343 t = netdev_priv(dev);
1344
1345 ip6gre_tunnel_unlink(ign, t);
1346 synchronize_net();
1347 ip6gre_tnl_change(t, &p1, 1);
1348 ip6gre_tunnel_link(ign, t);
1349 netdev_state_change(dev);
1350 }
1351 }
1352
1353 if (t) {
1354 err = 0;
1355
1356 memset(&p, 0, sizeof(p));
1357 ip6gre_tnl_parm_to_user(&p, &t->parms);
1358 if (copy_to_user(data, &p, sizeof(p)))
1359 err = -EFAULT;
1360 } else
1361 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1362 break;
1363
1364 case SIOCDELTUNNEL:
1365 err = -EPERM;
1366 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1367 goto done;
1368
1369 if (dev == ign->fb_tunnel_dev) {
1370 err = -EFAULT;
1371 if (copy_from_user(&p, data, sizeof(p)))
1372 goto done;
1373 err = -ENOENT;
1374 ip6gre_tnl_parm_from_user(&p1, &p);
1375 t = ip6gre_tunnel_locate(net, &p1, 0);
1376 if (!t)
1377 goto done;
1378 err = -EPERM;
1379 if (t == netdev_priv(ign->fb_tunnel_dev))
1380 goto done;
1381 dev = t->dev;
1382 }
1383 unregister_netdevice(dev);
1384 err = 0;
1385 break;
1386
1387 default:
1388 err = -EINVAL;
1389 }
1390
1391 done:
1392 return err;
1393 }
1394
ip6gre_header(struct sk_buff * skb,struct net_device * dev,unsigned short type,const void * daddr,const void * saddr,unsigned int len)1395 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1396 unsigned short type, const void *daddr,
1397 const void *saddr, unsigned int len)
1398 {
1399 struct ip6_tnl *t = netdev_priv(dev);
1400 struct ipv6hdr *ipv6h;
1401 __be16 *p;
1402
1403 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1404 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1405 t->fl.u.ip6.flowlabel,
1406 true, &t->fl.u.ip6));
1407 ipv6h->hop_limit = t->parms.hop_limit;
1408 ipv6h->nexthdr = NEXTHDR_GRE;
1409 ipv6h->saddr = t->parms.laddr;
1410 ipv6h->daddr = t->parms.raddr;
1411
1412 p = (__be16 *)(ipv6h + 1);
1413 p[0] = t->parms.o_flags;
1414 p[1] = htons(type);
1415
1416 /*
1417 * Set the source hardware address.
1418 */
1419
1420 if (saddr)
1421 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1422 if (daddr)
1423 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1424 if (!ipv6_addr_any(&ipv6h->daddr))
1425 return t->hlen;
1426
1427 return -t->hlen;
1428 }
1429
1430 static const struct header_ops ip6gre_header_ops = {
1431 .create = ip6gre_header,
1432 };
1433
1434 static const struct net_device_ops ip6gre_netdev_ops = {
1435 .ndo_init = ip6gre_tunnel_init,
1436 .ndo_uninit = ip6gre_tunnel_uninit,
1437 .ndo_start_xmit = ip6gre_tunnel_xmit,
1438 .ndo_siocdevprivate = ip6gre_tunnel_siocdevprivate,
1439 .ndo_change_mtu = ip6_tnl_change_mtu,
1440 .ndo_get_stats64 = dev_get_tstats64,
1441 .ndo_get_iflink = ip6_tnl_get_iflink,
1442 };
1443
ip6gre_dev_free(struct net_device * dev)1444 static void ip6gre_dev_free(struct net_device *dev)
1445 {
1446 struct ip6_tnl *t = netdev_priv(dev);
1447
1448 gro_cells_destroy(&t->gro_cells);
1449 dst_cache_destroy(&t->dst_cache);
1450 free_percpu(dev->tstats);
1451 }
1452
ip6gre_tunnel_setup(struct net_device * dev)1453 static void ip6gre_tunnel_setup(struct net_device *dev)
1454 {
1455 dev->netdev_ops = &ip6gre_netdev_ops;
1456 dev->needs_free_netdev = true;
1457 dev->priv_destructor = ip6gre_dev_free;
1458
1459 dev->type = ARPHRD_IP6GRE;
1460
1461 dev->flags |= IFF_NOARP;
1462 dev->addr_len = sizeof(struct in6_addr);
1463 netif_keep_dst(dev);
1464 /* This perm addr will be used as interface identifier by IPv6 */
1465 dev->addr_assign_type = NET_ADDR_RANDOM;
1466 eth_random_addr(dev->perm_addr);
1467 }
1468
1469 #define GRE6_FEATURES (NETIF_F_SG | \
1470 NETIF_F_FRAGLIST | \
1471 NETIF_F_HIGHDMA | \
1472 NETIF_F_HW_CSUM)
1473
ip6gre_tnl_init_features(struct net_device * dev)1474 static void ip6gre_tnl_init_features(struct net_device *dev)
1475 {
1476 struct ip6_tnl *nt = netdev_priv(dev);
1477 __be16 flags;
1478
1479 dev->features |= GRE6_FEATURES | NETIF_F_LLTX;
1480 dev->hw_features |= GRE6_FEATURES;
1481
1482 flags = nt->parms.o_flags;
1483
1484 /* TCP offload with GRE SEQ is not supported, nor can we support 2
1485 * levels of outer headers requiring an update.
1486 */
1487 if (flags & TUNNEL_SEQ)
1488 return;
1489 if (flags & TUNNEL_CSUM && nt->encap.type != TUNNEL_ENCAP_NONE)
1490 return;
1491
1492 dev->features |= NETIF_F_GSO_SOFTWARE;
1493 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1494 }
1495
ip6gre_tunnel_init_common(struct net_device * dev)1496 static int ip6gre_tunnel_init_common(struct net_device *dev)
1497 {
1498 struct ip6_tnl *tunnel;
1499 int ret;
1500 int t_hlen;
1501
1502 tunnel = netdev_priv(dev);
1503
1504 tunnel->dev = dev;
1505 tunnel->net = dev_net(dev);
1506 strcpy(tunnel->parms.name, dev->name);
1507
1508 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1509 if (!dev->tstats)
1510 return -ENOMEM;
1511
1512 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1513 if (ret)
1514 goto cleanup_alloc_pcpu_stats;
1515
1516 ret = gro_cells_init(&tunnel->gro_cells, dev);
1517 if (ret)
1518 goto cleanup_dst_cache_init;
1519
1520 t_hlen = ip6gre_calc_hlen(tunnel);
1521 dev->mtu = ETH_DATA_LEN - t_hlen;
1522 if (dev->type == ARPHRD_ETHER)
1523 dev->mtu -= ETH_HLEN;
1524 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1525 dev->mtu -= 8;
1526
1527 if (tunnel->parms.collect_md) {
1528 netif_keep_dst(dev);
1529 }
1530 ip6gre_tnl_init_features(dev);
1531
1532 netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
1533 return 0;
1534
1535 cleanup_dst_cache_init:
1536 dst_cache_destroy(&tunnel->dst_cache);
1537 cleanup_alloc_pcpu_stats:
1538 free_percpu(dev->tstats);
1539 dev->tstats = NULL;
1540 return ret;
1541 }
1542
ip6gre_tunnel_init(struct net_device * dev)1543 static int ip6gre_tunnel_init(struct net_device *dev)
1544 {
1545 struct ip6_tnl *tunnel;
1546 int ret;
1547
1548 ret = ip6gre_tunnel_init_common(dev);
1549 if (ret)
1550 return ret;
1551
1552 tunnel = netdev_priv(dev);
1553
1554 if (tunnel->parms.collect_md)
1555 return 0;
1556
1557 __dev_addr_set(dev, &tunnel->parms.laddr, sizeof(struct in6_addr));
1558 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1559
1560 if (ipv6_addr_any(&tunnel->parms.raddr))
1561 dev->header_ops = &ip6gre_header_ops;
1562
1563 return 0;
1564 }
1565
ip6gre_fb_tunnel_init(struct net_device * dev)1566 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1567 {
1568 struct ip6_tnl *tunnel = netdev_priv(dev);
1569
1570 tunnel->dev = dev;
1571 tunnel->net = dev_net(dev);
1572 strcpy(tunnel->parms.name, dev->name);
1573
1574 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1575 }
1576
1577 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1578 .handler = gre_rcv,
1579 .err_handler = ip6gre_err,
1580 .flags = INET6_PROTO_FINAL,
1581 };
1582
ip6gre_destroy_tunnels(struct net * net,struct list_head * head)1583 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1584 {
1585 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1586 struct net_device *dev, *aux;
1587 int prio;
1588
1589 for_each_netdev_safe(net, dev, aux)
1590 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1591 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1592 dev->rtnl_link_ops == &ip6erspan_tap_ops)
1593 unregister_netdevice_queue(dev, head);
1594
1595 for (prio = 0; prio < 4; prio++) {
1596 int h;
1597 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1598 struct ip6_tnl *t;
1599
1600 t = rtnl_dereference(ign->tunnels[prio][h]);
1601
1602 while (t) {
1603 /* If dev is in the same netns, it has already
1604 * been added to the list by the previous loop.
1605 */
1606 if (!net_eq(dev_net(t->dev), net))
1607 unregister_netdevice_queue(t->dev,
1608 head);
1609 t = rtnl_dereference(t->next);
1610 }
1611 }
1612 }
1613 }
1614
ip6gre_init_net(struct net * net)1615 static int __net_init ip6gre_init_net(struct net *net)
1616 {
1617 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1618 struct net_device *ndev;
1619 int err;
1620
1621 if (!net_has_fallback_tunnels(net))
1622 return 0;
1623 ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1624 NET_NAME_UNKNOWN, ip6gre_tunnel_setup);
1625 if (!ndev) {
1626 err = -ENOMEM;
1627 goto err_alloc_dev;
1628 }
1629 ign->fb_tunnel_dev = ndev;
1630 dev_net_set(ign->fb_tunnel_dev, net);
1631 /* FB netdevice is special: we have one, and only one per netns.
1632 * Allowing to move it to another netns is clearly unsafe.
1633 */
1634 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1635
1636
1637 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1638 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1639
1640 err = register_netdev(ign->fb_tunnel_dev);
1641 if (err)
1642 goto err_reg_dev;
1643
1644 rcu_assign_pointer(ign->tunnels_wc[0],
1645 netdev_priv(ign->fb_tunnel_dev));
1646 return 0;
1647
1648 err_reg_dev:
1649 free_netdev(ndev);
1650 err_alloc_dev:
1651 return err;
1652 }
1653
ip6gre_exit_batch_net(struct list_head * net_list)1654 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1655 {
1656 struct net *net;
1657 LIST_HEAD(list);
1658
1659 rtnl_lock();
1660 list_for_each_entry(net, net_list, exit_list)
1661 ip6gre_destroy_tunnels(net, &list);
1662 unregister_netdevice_many(&list);
1663 rtnl_unlock();
1664 }
1665
1666 static struct pernet_operations ip6gre_net_ops = {
1667 .init = ip6gre_init_net,
1668 .exit_batch = ip6gre_exit_batch_net,
1669 .id = &ip6gre_net_id,
1670 .size = sizeof(struct ip6gre_net),
1671 };
1672
ip6gre_tunnel_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1673 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1674 struct netlink_ext_ack *extack)
1675 {
1676 __be16 flags;
1677
1678 if (!data)
1679 return 0;
1680
1681 flags = 0;
1682 if (data[IFLA_GRE_IFLAGS])
1683 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1684 if (data[IFLA_GRE_OFLAGS])
1685 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1686 if (flags & (GRE_VERSION|GRE_ROUTING))
1687 return -EINVAL;
1688
1689 return 0;
1690 }
1691
ip6gre_tap_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1692 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1693 struct netlink_ext_ack *extack)
1694 {
1695 struct in6_addr daddr;
1696
1697 if (tb[IFLA_ADDRESS]) {
1698 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1699 return -EINVAL;
1700 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1701 return -EADDRNOTAVAIL;
1702 }
1703
1704 if (!data)
1705 goto out;
1706
1707 if (data[IFLA_GRE_REMOTE]) {
1708 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1709 if (ipv6_addr_any(&daddr))
1710 return -EINVAL;
1711 }
1712
1713 out:
1714 return ip6gre_tunnel_validate(tb, data, extack);
1715 }
1716
ip6erspan_tap_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1717 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1718 struct netlink_ext_ack *extack)
1719 {
1720 __be16 flags = 0;
1721 int ret, ver = 0;
1722
1723 if (!data)
1724 return 0;
1725
1726 ret = ip6gre_tap_validate(tb, data, extack);
1727 if (ret)
1728 return ret;
1729
1730 /* ERSPAN should only have GRE sequence and key flag */
1731 if (data[IFLA_GRE_OFLAGS])
1732 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1733 if (data[IFLA_GRE_IFLAGS])
1734 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1735 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1736 flags != (GRE_SEQ | GRE_KEY))
1737 return -EINVAL;
1738
1739 /* ERSPAN Session ID only has 10-bit. Since we reuse
1740 * 32-bit key field as ID, check it's range.
1741 */
1742 if (data[IFLA_GRE_IKEY] &&
1743 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1744 return -EINVAL;
1745
1746 if (data[IFLA_GRE_OKEY] &&
1747 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1748 return -EINVAL;
1749
1750 if (data[IFLA_GRE_ERSPAN_VER]) {
1751 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1752 if (ver != 1 && ver != 2)
1753 return -EINVAL;
1754 }
1755
1756 if (ver == 1) {
1757 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1758 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1759
1760 if (index & ~INDEX_MASK)
1761 return -EINVAL;
1762 }
1763 } else if (ver == 2) {
1764 if (data[IFLA_GRE_ERSPAN_DIR]) {
1765 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1766
1767 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1768 return -EINVAL;
1769 }
1770
1771 if (data[IFLA_GRE_ERSPAN_HWID]) {
1772 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1773
1774 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1775 return -EINVAL;
1776 }
1777 }
1778
1779 return 0;
1780 }
1781
ip6erspan_set_version(struct nlattr * data[],struct __ip6_tnl_parm * parms)1782 static void ip6erspan_set_version(struct nlattr *data[],
1783 struct __ip6_tnl_parm *parms)
1784 {
1785 if (!data)
1786 return;
1787
1788 parms->erspan_ver = 1;
1789 if (data[IFLA_GRE_ERSPAN_VER])
1790 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1791
1792 if (parms->erspan_ver == 1) {
1793 if (data[IFLA_GRE_ERSPAN_INDEX])
1794 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1795 } else if (parms->erspan_ver == 2) {
1796 if (data[IFLA_GRE_ERSPAN_DIR])
1797 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1798 if (data[IFLA_GRE_ERSPAN_HWID])
1799 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1800 }
1801 }
1802
ip6gre_netlink_parms(struct nlattr * data[],struct __ip6_tnl_parm * parms)1803 static void ip6gre_netlink_parms(struct nlattr *data[],
1804 struct __ip6_tnl_parm *parms)
1805 {
1806 memset(parms, 0, sizeof(*parms));
1807
1808 if (!data)
1809 return;
1810
1811 if (data[IFLA_GRE_LINK])
1812 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1813
1814 if (data[IFLA_GRE_IFLAGS])
1815 parms->i_flags = gre_flags_to_tnl_flags(
1816 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1817
1818 if (data[IFLA_GRE_OFLAGS])
1819 parms->o_flags = gre_flags_to_tnl_flags(
1820 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1821
1822 if (data[IFLA_GRE_IKEY])
1823 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1824
1825 if (data[IFLA_GRE_OKEY])
1826 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1827
1828 if (data[IFLA_GRE_LOCAL])
1829 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1830
1831 if (data[IFLA_GRE_REMOTE])
1832 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1833
1834 if (data[IFLA_GRE_TTL])
1835 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1836
1837 if (data[IFLA_GRE_ENCAP_LIMIT])
1838 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1839
1840 if (data[IFLA_GRE_FLOWINFO])
1841 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1842
1843 if (data[IFLA_GRE_FLAGS])
1844 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1845
1846 if (data[IFLA_GRE_FWMARK])
1847 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1848
1849 if (data[IFLA_GRE_COLLECT_METADATA])
1850 parms->collect_md = true;
1851 }
1852
ip6gre_tap_init(struct net_device * dev)1853 static int ip6gre_tap_init(struct net_device *dev)
1854 {
1855 int ret;
1856
1857 ret = ip6gre_tunnel_init_common(dev);
1858 if (ret)
1859 return ret;
1860
1861 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1862
1863 return 0;
1864 }
1865
1866 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1867 .ndo_init = ip6gre_tap_init,
1868 .ndo_uninit = ip6gre_tunnel_uninit,
1869 .ndo_start_xmit = ip6gre_tunnel_xmit,
1870 .ndo_set_mac_address = eth_mac_addr,
1871 .ndo_validate_addr = eth_validate_addr,
1872 .ndo_change_mtu = ip6_tnl_change_mtu,
1873 .ndo_get_stats64 = dev_get_tstats64,
1874 .ndo_get_iflink = ip6_tnl_get_iflink,
1875 };
1876
ip6erspan_calc_hlen(struct ip6_tnl * tunnel)1877 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1878 {
1879 int t_hlen;
1880
1881 tunnel->tun_hlen = 8;
1882 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1883 erspan_hdr_len(tunnel->parms.erspan_ver);
1884
1885 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1886 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1887 return t_hlen;
1888 }
1889
ip6erspan_tap_init(struct net_device * dev)1890 static int ip6erspan_tap_init(struct net_device *dev)
1891 {
1892 struct ip6_tnl *tunnel;
1893 int t_hlen;
1894 int ret;
1895
1896 tunnel = netdev_priv(dev);
1897
1898 tunnel->dev = dev;
1899 tunnel->net = dev_net(dev);
1900 strcpy(tunnel->parms.name, dev->name);
1901
1902 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1903 if (!dev->tstats)
1904 return -ENOMEM;
1905
1906 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1907 if (ret)
1908 goto cleanup_alloc_pcpu_stats;
1909
1910 ret = gro_cells_init(&tunnel->gro_cells, dev);
1911 if (ret)
1912 goto cleanup_dst_cache_init;
1913
1914 t_hlen = ip6erspan_calc_hlen(tunnel);
1915 dev->mtu = ETH_DATA_LEN - t_hlen;
1916 if (dev->type == ARPHRD_ETHER)
1917 dev->mtu -= ETH_HLEN;
1918 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1919 dev->mtu -= 8;
1920
1921 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1922 ip6erspan_tnl_link_config(tunnel, 1);
1923
1924 netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
1925 return 0;
1926
1927 cleanup_dst_cache_init:
1928 dst_cache_destroy(&tunnel->dst_cache);
1929 cleanup_alloc_pcpu_stats:
1930 free_percpu(dev->tstats);
1931 dev->tstats = NULL;
1932 return ret;
1933 }
1934
1935 static const struct net_device_ops ip6erspan_netdev_ops = {
1936 .ndo_init = ip6erspan_tap_init,
1937 .ndo_uninit = ip6erspan_tunnel_uninit,
1938 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1939 .ndo_set_mac_address = eth_mac_addr,
1940 .ndo_validate_addr = eth_validate_addr,
1941 .ndo_change_mtu = ip6_tnl_change_mtu,
1942 .ndo_get_stats64 = dev_get_tstats64,
1943 .ndo_get_iflink = ip6_tnl_get_iflink,
1944 };
1945
ip6gre_tap_setup(struct net_device * dev)1946 static void ip6gre_tap_setup(struct net_device *dev)
1947 {
1948
1949 ether_setup(dev);
1950
1951 dev->max_mtu = 0;
1952 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1953 dev->needs_free_netdev = true;
1954 dev->priv_destructor = ip6gre_dev_free;
1955
1956 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1957 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1958 netif_keep_dst(dev);
1959 }
1960
ip6gre_netlink_encap_parms(struct nlattr * data[],struct ip_tunnel_encap * ipencap)1961 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1962 struct ip_tunnel_encap *ipencap)
1963 {
1964 bool ret = false;
1965
1966 memset(ipencap, 0, sizeof(*ipencap));
1967
1968 if (!data)
1969 return ret;
1970
1971 if (data[IFLA_GRE_ENCAP_TYPE]) {
1972 ret = true;
1973 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1974 }
1975
1976 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1977 ret = true;
1978 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1979 }
1980
1981 if (data[IFLA_GRE_ENCAP_SPORT]) {
1982 ret = true;
1983 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1984 }
1985
1986 if (data[IFLA_GRE_ENCAP_DPORT]) {
1987 ret = true;
1988 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1989 }
1990
1991 return ret;
1992 }
1993
ip6gre_newlink_common(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1994 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1995 struct nlattr *tb[], struct nlattr *data[],
1996 struct netlink_ext_ack *extack)
1997 {
1998 struct ip6_tnl *nt;
1999 struct ip_tunnel_encap ipencap;
2000 int err;
2001
2002 nt = netdev_priv(dev);
2003
2004 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2005 int err = ip6_tnl_encap_setup(nt, &ipencap);
2006
2007 if (err < 0)
2008 return err;
2009 }
2010
2011 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
2012 eth_hw_addr_random(dev);
2013
2014 nt->dev = dev;
2015 nt->net = dev_net(dev);
2016
2017 err = register_netdevice(dev);
2018 if (err)
2019 goto out;
2020
2021 if (tb[IFLA_MTU])
2022 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2023
2024 out:
2025 return err;
2026 }
2027
ip6gre_newlink(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2028 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
2029 struct nlattr *tb[], struct nlattr *data[],
2030 struct netlink_ext_ack *extack)
2031 {
2032 struct ip6_tnl *nt = netdev_priv(dev);
2033 struct net *net = dev_net(dev);
2034 struct ip6gre_net *ign;
2035 int err;
2036
2037 ip6gre_netlink_parms(data, &nt->parms);
2038 ign = net_generic(net, ip6gre_net_id);
2039
2040 if (nt->parms.collect_md) {
2041 if (rtnl_dereference(ign->collect_md_tun))
2042 return -EEXIST;
2043 } else {
2044 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2045 return -EEXIST;
2046 }
2047
2048 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2049 if (!err) {
2050 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
2051 ip6gre_tunnel_link_md(ign, nt);
2052 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2053 }
2054 return err;
2055 }
2056
2057 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)2058 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2059 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2060 struct netlink_ext_ack *extack)
2061 {
2062 struct ip6_tnl *t, *nt = netdev_priv(dev);
2063 struct net *net = nt->net;
2064 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2065 struct ip_tunnel_encap ipencap;
2066
2067 if (dev == ign->fb_tunnel_dev)
2068 return ERR_PTR(-EINVAL);
2069
2070 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2071 int err = ip6_tnl_encap_setup(nt, &ipencap);
2072
2073 if (err < 0)
2074 return ERR_PTR(err);
2075 }
2076
2077 ip6gre_netlink_parms(data, p_p);
2078
2079 t = ip6gre_tunnel_locate(net, p_p, 0);
2080
2081 if (t) {
2082 if (t->dev != dev)
2083 return ERR_PTR(-EEXIST);
2084 } else {
2085 t = nt;
2086 }
2087
2088 return t;
2089 }
2090
ip6gre_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2091 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2092 struct nlattr *data[],
2093 struct netlink_ext_ack *extack)
2094 {
2095 struct ip6_tnl *t = netdev_priv(dev);
2096 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2097 struct __ip6_tnl_parm p;
2098
2099 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2100 if (IS_ERR(t))
2101 return PTR_ERR(t);
2102
2103 ip6gre_tunnel_unlink_md(ign, t);
2104 ip6gre_tunnel_unlink(ign, t);
2105 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2106 ip6gre_tunnel_link_md(ign, t);
2107 ip6gre_tunnel_link(ign, t);
2108 return 0;
2109 }
2110
ip6gre_dellink(struct net_device * dev,struct list_head * head)2111 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2112 {
2113 struct net *net = dev_net(dev);
2114 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2115
2116 if (dev != ign->fb_tunnel_dev)
2117 unregister_netdevice_queue(dev, head);
2118 }
2119
ip6gre_get_size(const struct net_device * dev)2120 static size_t ip6gre_get_size(const struct net_device *dev)
2121 {
2122 return
2123 /* IFLA_GRE_LINK */
2124 nla_total_size(4) +
2125 /* IFLA_GRE_IFLAGS */
2126 nla_total_size(2) +
2127 /* IFLA_GRE_OFLAGS */
2128 nla_total_size(2) +
2129 /* IFLA_GRE_IKEY */
2130 nla_total_size(4) +
2131 /* IFLA_GRE_OKEY */
2132 nla_total_size(4) +
2133 /* IFLA_GRE_LOCAL */
2134 nla_total_size(sizeof(struct in6_addr)) +
2135 /* IFLA_GRE_REMOTE */
2136 nla_total_size(sizeof(struct in6_addr)) +
2137 /* IFLA_GRE_TTL */
2138 nla_total_size(1) +
2139 /* IFLA_GRE_ENCAP_LIMIT */
2140 nla_total_size(1) +
2141 /* IFLA_GRE_FLOWINFO */
2142 nla_total_size(4) +
2143 /* IFLA_GRE_FLAGS */
2144 nla_total_size(4) +
2145 /* IFLA_GRE_ENCAP_TYPE */
2146 nla_total_size(2) +
2147 /* IFLA_GRE_ENCAP_FLAGS */
2148 nla_total_size(2) +
2149 /* IFLA_GRE_ENCAP_SPORT */
2150 nla_total_size(2) +
2151 /* IFLA_GRE_ENCAP_DPORT */
2152 nla_total_size(2) +
2153 /* IFLA_GRE_COLLECT_METADATA */
2154 nla_total_size(0) +
2155 /* IFLA_GRE_FWMARK */
2156 nla_total_size(4) +
2157 /* IFLA_GRE_ERSPAN_INDEX */
2158 nla_total_size(4) +
2159 0;
2160 }
2161
ip6gre_fill_info(struct sk_buff * skb,const struct net_device * dev)2162 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2163 {
2164 struct ip6_tnl *t = netdev_priv(dev);
2165 struct __ip6_tnl_parm *p = &t->parms;
2166 __be16 o_flags = p->o_flags;
2167
2168 if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2169 if (!p->collect_md)
2170 o_flags |= TUNNEL_KEY;
2171
2172 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2173 goto nla_put_failure;
2174
2175 if (p->erspan_ver == 1) {
2176 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2177 goto nla_put_failure;
2178 } else {
2179 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2180 goto nla_put_failure;
2181 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2182 goto nla_put_failure;
2183 }
2184 }
2185
2186 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2187 nla_put_be16(skb, IFLA_GRE_IFLAGS,
2188 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2189 nla_put_be16(skb, IFLA_GRE_OFLAGS,
2190 gre_tnl_flags_to_gre_flags(o_flags)) ||
2191 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2192 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2193 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2194 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2195 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2196 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2197 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2198 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2199 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
2200 goto nla_put_failure;
2201
2202 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2203 t->encap.type) ||
2204 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2205 t->encap.sport) ||
2206 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2207 t->encap.dport) ||
2208 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2209 t->encap.flags))
2210 goto nla_put_failure;
2211
2212 if (p->collect_md) {
2213 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2214 goto nla_put_failure;
2215 }
2216
2217 return 0;
2218
2219 nla_put_failure:
2220 return -EMSGSIZE;
2221 }
2222
2223 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2224 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2225 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2226 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2227 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2228 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2229 [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct ipv6hdr, saddr) },
2230 [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct ipv6hdr, daddr) },
2231 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2232 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2233 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2234 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
2235 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2236 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2237 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2238 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
2239 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2240 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
2241 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2242 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2243 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2244 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
2245 };
2246
ip6erspan_tap_setup(struct net_device * dev)2247 static void ip6erspan_tap_setup(struct net_device *dev)
2248 {
2249 ether_setup(dev);
2250
2251 dev->max_mtu = 0;
2252 dev->netdev_ops = &ip6erspan_netdev_ops;
2253 dev->needs_free_netdev = true;
2254 dev->priv_destructor = ip6gre_dev_free;
2255
2256 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2257 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2258 netif_keep_dst(dev);
2259 }
2260
ip6erspan_newlink(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2261 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2262 struct nlattr *tb[], struct nlattr *data[],
2263 struct netlink_ext_ack *extack)
2264 {
2265 struct ip6_tnl *nt = netdev_priv(dev);
2266 struct net *net = dev_net(dev);
2267 struct ip6gre_net *ign;
2268 int err;
2269
2270 ip6gre_netlink_parms(data, &nt->parms);
2271 ip6erspan_set_version(data, &nt->parms);
2272 ign = net_generic(net, ip6gre_net_id);
2273
2274 if (nt->parms.collect_md) {
2275 if (rtnl_dereference(ign->collect_md_tun_erspan))
2276 return -EEXIST;
2277 } else {
2278 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2279 return -EEXIST;
2280 }
2281
2282 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2283 if (!err) {
2284 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2285 ip6erspan_tunnel_link_md(ign, nt);
2286 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2287 }
2288 return err;
2289 }
2290
ip6erspan_tnl_link_config(struct ip6_tnl * t,int set_mtu)2291 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2292 {
2293 ip6gre_tnl_link_config_common(t);
2294 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2295 }
2296
ip6erspan_tnl_change(struct ip6_tnl * t,const struct __ip6_tnl_parm * p,int set_mtu)2297 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2298 const struct __ip6_tnl_parm *p, int set_mtu)
2299 {
2300 ip6gre_tnl_copy_tnl_parm(t, p);
2301 ip6erspan_tnl_link_config(t, set_mtu);
2302 return 0;
2303 }
2304
ip6erspan_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2305 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2306 struct nlattr *data[],
2307 struct netlink_ext_ack *extack)
2308 {
2309 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2310 struct __ip6_tnl_parm p;
2311 struct ip6_tnl *t;
2312
2313 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2314 if (IS_ERR(t))
2315 return PTR_ERR(t);
2316
2317 ip6erspan_set_version(data, &p);
2318 ip6gre_tunnel_unlink_md(ign, t);
2319 ip6gre_tunnel_unlink(ign, t);
2320 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2321 ip6erspan_tunnel_link_md(ign, t);
2322 ip6gre_tunnel_link(ign, t);
2323 return 0;
2324 }
2325
2326 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2327 .kind = "ip6gre",
2328 .maxtype = IFLA_GRE_MAX,
2329 .policy = ip6gre_policy,
2330 .priv_size = sizeof(struct ip6_tnl),
2331 .setup = ip6gre_tunnel_setup,
2332 .validate = ip6gre_tunnel_validate,
2333 .newlink = ip6gre_newlink,
2334 .changelink = ip6gre_changelink,
2335 .dellink = ip6gre_dellink,
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 ip6gre_tap_ops __read_mostly = {
2342 .kind = "ip6gretap",
2343 .maxtype = IFLA_GRE_MAX,
2344 .policy = ip6gre_policy,
2345 .priv_size = sizeof(struct ip6_tnl),
2346 .setup = ip6gre_tap_setup,
2347 .validate = ip6gre_tap_validate,
2348 .newlink = ip6gre_newlink,
2349 .changelink = ip6gre_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 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2356 .kind = "ip6erspan",
2357 .maxtype = IFLA_GRE_MAX,
2358 .policy = ip6gre_policy,
2359 .priv_size = sizeof(struct ip6_tnl),
2360 .setup = ip6erspan_tap_setup,
2361 .validate = ip6erspan_tap_validate,
2362 .newlink = ip6erspan_newlink,
2363 .changelink = ip6erspan_changelink,
2364 .get_size = ip6gre_get_size,
2365 .fill_info = ip6gre_fill_info,
2366 .get_link_net = ip6_tnl_get_link_net,
2367 };
2368
2369 /*
2370 * And now the modules code and kernel interface.
2371 */
2372
ip6gre_init(void)2373 static int __init ip6gre_init(void)
2374 {
2375 int err;
2376
2377 pr_info("GRE over IPv6 tunneling driver\n");
2378
2379 err = register_pernet_device(&ip6gre_net_ops);
2380 if (err < 0)
2381 return err;
2382
2383 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2384 if (err < 0) {
2385 pr_info("%s: can't add protocol\n", __func__);
2386 goto add_proto_failed;
2387 }
2388
2389 err = rtnl_link_register(&ip6gre_link_ops);
2390 if (err < 0)
2391 goto rtnl_link_failed;
2392
2393 err = rtnl_link_register(&ip6gre_tap_ops);
2394 if (err < 0)
2395 goto tap_ops_failed;
2396
2397 err = rtnl_link_register(&ip6erspan_tap_ops);
2398 if (err < 0)
2399 goto erspan_link_failed;
2400
2401 out:
2402 return err;
2403
2404 erspan_link_failed:
2405 rtnl_link_unregister(&ip6gre_tap_ops);
2406 tap_ops_failed:
2407 rtnl_link_unregister(&ip6gre_link_ops);
2408 rtnl_link_failed:
2409 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2410 add_proto_failed:
2411 unregister_pernet_device(&ip6gre_net_ops);
2412 goto out;
2413 }
2414
ip6gre_fini(void)2415 static void __exit ip6gre_fini(void)
2416 {
2417 rtnl_link_unregister(&ip6gre_tap_ops);
2418 rtnl_link_unregister(&ip6gre_link_ops);
2419 rtnl_link_unregister(&ip6erspan_tap_ops);
2420 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2421 unregister_pernet_device(&ip6gre_net_ops);
2422 }
2423
2424 module_init(ip6gre_init);
2425 module_exit(ip6gre_fini);
2426 MODULE_LICENSE("GPL");
2427 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2428 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2429 MODULE_ALIAS_RTNL_LINK("ip6gre");
2430 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2431 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2432 MODULE_ALIAS_NETDEV("ip6gre0");
2433