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 strlcpy(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
386 /* Can use a lockless transmit, unless we generate output sequences */
387 if (!(nt->parms.o_flags & TUNNEL_SEQ))
388 dev->features |= NETIF_F_LLTX;
389
390 ip6gre_tunnel_link(ign, nt);
391 return nt;
392
393 failed_free:
394 free_netdev(dev);
395 return NULL;
396 }
397
ip6erspan_tunnel_uninit(struct net_device * dev)398 static void ip6erspan_tunnel_uninit(struct net_device *dev)
399 {
400 struct ip6_tnl *t = netdev_priv(dev);
401 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
402
403 ip6erspan_tunnel_unlink_md(ign, t);
404 ip6gre_tunnel_unlink(ign, t);
405 dst_cache_reset(&t->dst_cache);
406 dev_put(dev);
407 }
408
ip6gre_tunnel_uninit(struct net_device * dev)409 static void ip6gre_tunnel_uninit(struct net_device *dev)
410 {
411 struct ip6_tnl *t = netdev_priv(dev);
412 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
413
414 ip6gre_tunnel_unlink_md(ign, t);
415 ip6gre_tunnel_unlink(ign, t);
416 if (ign->fb_tunnel_dev == dev)
417 WRITE_ONCE(ign->fb_tunnel_dev, NULL);
418 dst_cache_reset(&t->dst_cache);
419 dev_put(dev);
420 }
421
422
ip6gre_err(struct sk_buff * skb,struct inet6_skb_parm * opt,u8 type,u8 code,int offset,__be32 info)423 static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
424 u8 type, u8 code, int offset, __be32 info)
425 {
426 struct net *net = dev_net(skb->dev);
427 const struct ipv6hdr *ipv6h;
428 struct tnl_ptk_info tpi;
429 struct ip6_tnl *t;
430
431 if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6),
432 offset) < 0)
433 return -EINVAL;
434
435 ipv6h = (const struct ipv6hdr *)skb->data;
436 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
437 tpi.key, tpi.proto);
438 if (!t)
439 return -ENOENT;
440
441 switch (type) {
442 case ICMPV6_DEST_UNREACH:
443 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
444 t->parms.name);
445 if (code != ICMPV6_PORT_UNREACH)
446 break;
447 return 0;
448 case ICMPV6_TIME_EXCEED:
449 if (code == ICMPV6_EXC_HOPLIMIT) {
450 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
451 t->parms.name);
452 break;
453 }
454 return 0;
455 case ICMPV6_PARAMPROB: {
456 struct ipv6_tlv_tnl_enc_lim *tel;
457 __u32 teli;
458
459 teli = 0;
460 if (code == ICMPV6_HDR_FIELD)
461 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
462
463 if (teli && teli == be32_to_cpu(info) - 2) {
464 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
465 if (tel->encap_limit == 0) {
466 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
467 t->parms.name);
468 }
469 } else {
470 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
471 t->parms.name);
472 }
473 return 0;
474 }
475 case ICMPV6_PKT_TOOBIG:
476 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
477 return 0;
478 case NDISC_REDIRECT:
479 ip6_redirect(skb, net, skb->dev->ifindex, 0,
480 sock_net_uid(net, NULL));
481 return 0;
482 }
483
484 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
485 t->err_count++;
486 else
487 t->err_count = 1;
488 t->err_time = jiffies;
489
490 return 0;
491 }
492
ip6gre_rcv(struct sk_buff * skb,const struct tnl_ptk_info * tpi)493 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
494 {
495 const struct ipv6hdr *ipv6h;
496 struct ip6_tnl *tunnel;
497
498 ipv6h = ipv6_hdr(skb);
499 tunnel = ip6gre_tunnel_lookup(skb->dev,
500 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
501 tpi->proto);
502 if (tunnel) {
503 if (tunnel->parms.collect_md) {
504 struct metadata_dst *tun_dst;
505 __be64 tun_id;
506 __be16 flags;
507
508 flags = tpi->flags;
509 tun_id = key32_to_tunnel_id(tpi->key);
510
511 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
512 if (!tun_dst)
513 return PACKET_REJECT;
514
515 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
516 } else {
517 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
518 }
519
520 return PACKET_RCVD;
521 }
522
523 return PACKET_REJECT;
524 }
525
ip6erspan_rcv(struct sk_buff * skb,struct tnl_ptk_info * tpi,int gre_hdr_len)526 static int ip6erspan_rcv(struct sk_buff *skb,
527 struct tnl_ptk_info *tpi,
528 int gre_hdr_len)
529 {
530 struct erspan_base_hdr *ershdr;
531 const struct ipv6hdr *ipv6h;
532 struct erspan_md2 *md2;
533 struct ip6_tnl *tunnel;
534 u8 ver;
535
536 ipv6h = ipv6_hdr(skb);
537 ershdr = (struct erspan_base_hdr *)skb->data;
538 ver = ershdr->ver;
539
540 tunnel = ip6gre_tunnel_lookup(skb->dev,
541 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
542 tpi->proto);
543 if (tunnel) {
544 int len = erspan_hdr_len(ver);
545
546 if (unlikely(!pskb_may_pull(skb, len)))
547 return PACKET_REJECT;
548
549 if (__iptunnel_pull_header(skb, len,
550 htons(ETH_P_TEB),
551 false, false) < 0)
552 return PACKET_REJECT;
553
554 if (tunnel->parms.collect_md) {
555 struct erspan_metadata *pkt_md, *md;
556 struct metadata_dst *tun_dst;
557 struct ip_tunnel_info *info;
558 unsigned char *gh;
559 __be64 tun_id;
560 __be16 flags;
561
562 tpi->flags |= TUNNEL_KEY;
563 flags = tpi->flags;
564 tun_id = key32_to_tunnel_id(tpi->key);
565
566 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
567 sizeof(*md));
568 if (!tun_dst)
569 return PACKET_REJECT;
570
571 /* skb can be uncloned in __iptunnel_pull_header, so
572 * old pkt_md is no longer valid and we need to reset
573 * it
574 */
575 gh = skb_network_header(skb) +
576 skb_network_header_len(skb);
577 pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len +
578 sizeof(*ershdr));
579 info = &tun_dst->u.tun_info;
580 md = ip_tunnel_info_opts(info);
581 md->version = ver;
582 md2 = &md->u.md2;
583 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
584 ERSPAN_V2_MDSIZE);
585 info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
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
skb_tunnel_info_txcheck(struct sk_buff * skb)709 static struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb)
710 {
711 struct ip_tunnel_info *tun_info;
712
713 tun_info = skb_tunnel_info(skb);
714 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX)))
715 return ERR_PTR(-EINVAL);
716
717 return tun_info;
718 }
719
__gre6_xmit(struct sk_buff * skb,struct net_device * dev,__u8 dsfield,struct flowi6 * fl6,int encap_limit,__u32 * pmtu,__be16 proto)720 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
721 struct net_device *dev, __u8 dsfield,
722 struct flowi6 *fl6, int encap_limit,
723 __u32 *pmtu, __be16 proto)
724 {
725 struct ip6_tnl *tunnel = netdev_priv(dev);
726 __be16 protocol;
727
728 if (dev->type == ARPHRD_ETHER)
729 IPCB(skb)->flags = 0;
730
731 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
732 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
733 else
734 fl6->daddr = tunnel->parms.raddr;
735
736 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
737 return -ENOMEM;
738
739 /* Push GRE header. */
740 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
741
742 if (tunnel->parms.collect_md) {
743 struct ip_tunnel_info *tun_info;
744 const struct ip_tunnel_key *key;
745 __be16 flags;
746
747 tun_info = skb_tunnel_info_txcheck(skb);
748 if (IS_ERR(tun_info) ||
749 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
750 return -EINVAL;
751
752 key = &tun_info->key;
753 memset(fl6, 0, sizeof(*fl6));
754 fl6->flowi6_proto = IPPROTO_GRE;
755 fl6->daddr = key->u.ipv6.dst;
756 fl6->flowlabel = key->label;
757 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
758
759 dsfield = key->tos;
760 flags = key->tun_flags &
761 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
762 tunnel->tun_hlen = gre_calc_hlen(flags);
763
764 gre_build_header(skb, tunnel->tun_hlen,
765 flags, protocol,
766 tunnel_id_to_key32(tun_info->key.tun_id),
767 (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++)
768 : 0);
769
770 } else {
771 if (tunnel->parms.o_flags & TUNNEL_SEQ)
772 tunnel->o_seqno++;
773
774 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
775 protocol, tunnel->parms.o_key,
776 htonl(tunnel->o_seqno));
777 }
778
779 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
780 NEXTHDR_GRE);
781 }
782
ip6gre_xmit_ipv4(struct sk_buff * skb,struct net_device * dev)783 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
784 {
785 struct ip6_tnl *t = netdev_priv(dev);
786 int encap_limit = -1;
787 struct flowi6 fl6;
788 __u8 dsfield = 0;
789 __u32 mtu;
790 int err;
791
792 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
793
794 if (!t->parms.collect_md)
795 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
796 &dsfield, &encap_limit);
797
798 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
799 if (err)
800 return -1;
801
802 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
803 skb->protocol);
804 if (err != 0) {
805 /* XXX: send ICMP error even if DF is not set. */
806 if (err == -EMSGSIZE)
807 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
808 htonl(mtu));
809 return -1;
810 }
811
812 return 0;
813 }
814
ip6gre_xmit_ipv6(struct sk_buff * skb,struct net_device * dev)815 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
816 {
817 struct ip6_tnl *t = netdev_priv(dev);
818 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
819 int encap_limit = -1;
820 struct flowi6 fl6;
821 __u8 dsfield = 0;
822 __u32 mtu;
823 int err;
824
825 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
826 return -1;
827
828 if (!t->parms.collect_md &&
829 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
830 return -1;
831
832 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
833 return -1;
834
835 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
836 &mtu, skb->protocol);
837 if (err != 0) {
838 if (err == -EMSGSIZE)
839 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
840 return -1;
841 }
842
843 return 0;
844 }
845
846 /**
847 * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own
848 * @t: the outgoing tunnel device
849 * @hdr: IPv6 header from the incoming packet
850 *
851 * Description:
852 * Avoid trivial tunneling loop by checking that tunnel exit-point
853 * doesn't match source of incoming packet.
854 *
855 * Return:
856 * 1 if conflict,
857 * 0 else
858 **/
859
ip6gre_tnl_addr_conflict(const struct ip6_tnl * t,const struct ipv6hdr * hdr)860 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
861 const struct ipv6hdr *hdr)
862 {
863 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
864 }
865
ip6gre_xmit_other(struct sk_buff * skb,struct net_device * dev)866 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
867 {
868 struct ip6_tnl *t = netdev_priv(dev);
869 int encap_limit = -1;
870 struct flowi6 fl6;
871 __u32 mtu;
872 int err;
873
874 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
875 encap_limit = t->parms.encap_limit;
876
877 if (!t->parms.collect_md)
878 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
879
880 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
881 if (err)
882 return err;
883
884 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
885
886 return err;
887 }
888
ip6gre_tunnel_xmit(struct sk_buff * skb,struct net_device * dev)889 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
890 struct net_device *dev)
891 {
892 struct ip6_tnl *t = netdev_priv(dev);
893 struct net_device_stats *stats = &t->dev->stats;
894 int ret;
895
896 if (!pskb_inet_may_pull(skb))
897 goto tx_err;
898
899 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
900 goto tx_err;
901
902 switch (skb->protocol) {
903 case htons(ETH_P_IP):
904 ret = ip6gre_xmit_ipv4(skb, dev);
905 break;
906 case htons(ETH_P_IPV6):
907 ret = ip6gre_xmit_ipv6(skb, dev);
908 break;
909 default:
910 ret = ip6gre_xmit_other(skb, dev);
911 break;
912 }
913
914 if (ret < 0)
915 goto tx_err;
916
917 return NETDEV_TX_OK;
918
919 tx_err:
920 if (!t->parms.collect_md || !IS_ERR(skb_tunnel_info_txcheck(skb)))
921 stats->tx_errors++;
922 stats->tx_dropped++;
923 kfree_skb(skb);
924 return NETDEV_TX_OK;
925 }
926
ip6erspan_tunnel_xmit(struct sk_buff * skb,struct net_device * dev)927 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
928 struct net_device *dev)
929 {
930 struct ip_tunnel_info *tun_info = NULL;
931 struct ip6_tnl *t = netdev_priv(dev);
932 struct dst_entry *dst = skb_dst(skb);
933 struct net_device_stats *stats;
934 bool truncate = false;
935 int encap_limit = -1;
936 __u8 dsfield = false;
937 struct flowi6 fl6;
938 int err = -EINVAL;
939 __be16 proto;
940 __u32 mtu;
941 int nhoff;
942 int thoff;
943
944 if (!pskb_inet_may_pull(skb))
945 goto tx_err;
946
947 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
948 goto tx_err;
949
950 if (gre_handle_offloads(skb, false))
951 goto tx_err;
952
953 if (skb->len > dev->mtu + dev->hard_header_len) {
954 pskb_trim(skb, dev->mtu + dev->hard_header_len);
955 truncate = true;
956 }
957
958 nhoff = skb_network_header(skb) - skb_mac_header(skb);
959 if (skb->protocol == htons(ETH_P_IP) &&
960 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
961 truncate = true;
962
963 thoff = skb_transport_header(skb) - skb_mac_header(skb);
964 if (skb->protocol == htons(ETH_P_IPV6) &&
965 (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff))
966 truncate = true;
967
968 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
969 goto tx_err;
970
971 t->parms.o_flags &= ~TUNNEL_KEY;
972 IPCB(skb)->flags = 0;
973
974 /* For collect_md mode, derive fl6 from the tunnel key,
975 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
976 */
977 if (t->parms.collect_md) {
978 const struct ip_tunnel_key *key;
979 struct erspan_metadata *md;
980 __be32 tun_id;
981
982 tun_info = skb_tunnel_info_txcheck(skb);
983 if (IS_ERR(tun_info) ||
984 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
985 goto tx_err;
986
987 key = &tun_info->key;
988 memset(&fl6, 0, sizeof(fl6));
989 fl6.flowi6_proto = IPPROTO_GRE;
990 fl6.daddr = key->u.ipv6.dst;
991 fl6.flowlabel = key->label;
992 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
993
994 dsfield = key->tos;
995 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
996 goto tx_err;
997 if (tun_info->options_len < sizeof(*md))
998 goto tx_err;
999 md = ip_tunnel_info_opts(tun_info);
1000
1001 tun_id = tunnel_id_to_key32(key->tun_id);
1002 if (md->version == 1) {
1003 erspan_build_header(skb,
1004 ntohl(tun_id),
1005 ntohl(md->u.index), truncate,
1006 false);
1007 } else if (md->version == 2) {
1008 erspan_build_header_v2(skb,
1009 ntohl(tun_id),
1010 md->u.md2.dir,
1011 get_hwid(&md->u.md2),
1012 truncate, false);
1013 } else {
1014 goto tx_err;
1015 }
1016 } else {
1017 switch (skb->protocol) {
1018 case htons(ETH_P_IP):
1019 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1020 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1021 &dsfield, &encap_limit);
1022 break;
1023 case htons(ETH_P_IPV6):
1024 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1025 goto tx_err;
1026 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1027 &dsfield, &encap_limit))
1028 goto tx_err;
1029 break;
1030 default:
1031 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1032 break;
1033 }
1034
1035 if (t->parms.erspan_ver == 1)
1036 erspan_build_header(skb, ntohl(t->parms.o_key),
1037 t->parms.index,
1038 truncate, false);
1039 else if (t->parms.erspan_ver == 2)
1040 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1041 t->parms.dir,
1042 t->parms.hwid,
1043 truncate, false);
1044 else
1045 goto tx_err;
1046
1047 fl6.daddr = t->parms.raddr;
1048 }
1049
1050 /* Push GRE header. */
1051 proto = (t->parms.erspan_ver == 1) ? htons(ETH_P_ERSPAN)
1052 : htons(ETH_P_ERSPAN2);
1053 gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(t->o_seqno++));
1054
1055 /* TooBig packet may have updated dst->dev's mtu */
1056 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1057 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false);
1058
1059 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1060 NEXTHDR_GRE);
1061 if (err != 0) {
1062 /* XXX: send ICMP error even if DF is not set. */
1063 if (err == -EMSGSIZE) {
1064 if (skb->protocol == htons(ETH_P_IP))
1065 icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1066 ICMP_FRAG_NEEDED, htonl(mtu));
1067 else
1068 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1069 }
1070
1071 goto tx_err;
1072 }
1073 return NETDEV_TX_OK;
1074
1075 tx_err:
1076 stats = &t->dev->stats;
1077 if (!IS_ERR(tun_info))
1078 stats->tx_errors++;
1079 stats->tx_dropped++;
1080 kfree_skb(skb);
1081 return NETDEV_TX_OK;
1082 }
1083
ip6gre_tnl_link_config_common(struct ip6_tnl * t)1084 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1085 {
1086 struct net_device *dev = t->dev;
1087 struct __ip6_tnl_parm *p = &t->parms;
1088 struct flowi6 *fl6 = &t->fl.u.ip6;
1089
1090 if (dev->type != ARPHRD_ETHER) {
1091 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1092 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1093 }
1094
1095 /* Set up flowi template */
1096 fl6->saddr = p->laddr;
1097 fl6->daddr = p->raddr;
1098 fl6->flowi6_oif = p->link;
1099 fl6->flowlabel = 0;
1100 fl6->flowi6_proto = IPPROTO_GRE;
1101
1102 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1103 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1104 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1105 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1106
1107 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1108 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1109
1110 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1111 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1112 dev->flags |= IFF_POINTOPOINT;
1113 else
1114 dev->flags &= ~IFF_POINTOPOINT;
1115 }
1116
ip6gre_tnl_link_config_route(struct ip6_tnl * t,int set_mtu,int t_hlen)1117 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1118 int t_hlen)
1119 {
1120 const struct __ip6_tnl_parm *p = &t->parms;
1121 struct net_device *dev = t->dev;
1122
1123 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1124 int strict = (ipv6_addr_type(&p->raddr) &
1125 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1126
1127 struct rt6_info *rt = rt6_lookup(t->net,
1128 &p->raddr, &p->laddr,
1129 p->link, NULL, strict);
1130
1131 if (!rt)
1132 return;
1133
1134 if (rt->dst.dev) {
1135 unsigned short dst_len = rt->dst.dev->hard_header_len +
1136 t_hlen;
1137
1138 if (t->dev->header_ops)
1139 dev->hard_header_len = dst_len;
1140 else
1141 dev->needed_headroom = dst_len;
1142
1143 if (set_mtu) {
1144 dev->mtu = rt->dst.dev->mtu - t_hlen;
1145 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1146 dev->mtu -= 8;
1147 if (dev->type == ARPHRD_ETHER)
1148 dev->mtu -= ETH_HLEN;
1149
1150 if (dev->mtu < IPV6_MIN_MTU)
1151 dev->mtu = IPV6_MIN_MTU;
1152 }
1153 }
1154 ip6_rt_put(rt);
1155 }
1156 }
1157
ip6gre_calc_hlen(struct ip6_tnl * tunnel)1158 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1159 {
1160 int t_hlen;
1161
1162 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1163 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1164
1165 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1166
1167 if (tunnel->dev->header_ops)
1168 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1169 else
1170 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1171
1172 return t_hlen;
1173 }
1174
ip6gre_tnl_link_config(struct ip6_tnl * t,int set_mtu)1175 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1176 {
1177 ip6gre_tnl_link_config_common(t);
1178 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1179 }
1180
ip6gre_tnl_copy_tnl_parm(struct ip6_tnl * t,const struct __ip6_tnl_parm * p)1181 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1182 const struct __ip6_tnl_parm *p)
1183 {
1184 t->parms.laddr = p->laddr;
1185 t->parms.raddr = p->raddr;
1186 t->parms.flags = p->flags;
1187 t->parms.hop_limit = p->hop_limit;
1188 t->parms.encap_limit = p->encap_limit;
1189 t->parms.flowinfo = p->flowinfo;
1190 t->parms.link = p->link;
1191 t->parms.proto = p->proto;
1192 t->parms.i_key = p->i_key;
1193 t->parms.o_key = p->o_key;
1194 t->parms.i_flags = p->i_flags;
1195 t->parms.o_flags = p->o_flags;
1196 t->parms.fwmark = p->fwmark;
1197 t->parms.erspan_ver = p->erspan_ver;
1198 t->parms.index = p->index;
1199 t->parms.dir = p->dir;
1200 t->parms.hwid = p->hwid;
1201 dst_cache_reset(&t->dst_cache);
1202 }
1203
ip6gre_tnl_change(struct ip6_tnl * t,const struct __ip6_tnl_parm * p,int set_mtu)1204 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1205 int set_mtu)
1206 {
1207 ip6gre_tnl_copy_tnl_parm(t, p);
1208 ip6gre_tnl_link_config(t, set_mtu);
1209 return 0;
1210 }
1211
ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm * p,const struct ip6_tnl_parm2 * u)1212 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1213 const struct ip6_tnl_parm2 *u)
1214 {
1215 p->laddr = u->laddr;
1216 p->raddr = u->raddr;
1217 p->flags = u->flags;
1218 p->hop_limit = u->hop_limit;
1219 p->encap_limit = u->encap_limit;
1220 p->flowinfo = u->flowinfo;
1221 p->link = u->link;
1222 p->i_key = u->i_key;
1223 p->o_key = u->o_key;
1224 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1225 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1226 memcpy(p->name, u->name, sizeof(u->name));
1227 }
1228
ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 * u,const struct __ip6_tnl_parm * p)1229 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1230 const struct __ip6_tnl_parm *p)
1231 {
1232 u->proto = IPPROTO_GRE;
1233 u->laddr = p->laddr;
1234 u->raddr = p->raddr;
1235 u->flags = p->flags;
1236 u->hop_limit = p->hop_limit;
1237 u->encap_limit = p->encap_limit;
1238 u->flowinfo = p->flowinfo;
1239 u->link = p->link;
1240 u->i_key = p->i_key;
1241 u->o_key = p->o_key;
1242 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1243 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1244 memcpy(u->name, p->name, sizeof(u->name));
1245 }
1246
ip6gre_tunnel_siocdevprivate(struct net_device * dev,struct ifreq * ifr,void __user * data,int cmd)1247 static int ip6gre_tunnel_siocdevprivate(struct net_device *dev,
1248 struct ifreq *ifr, void __user *data,
1249 int cmd)
1250 {
1251 int err = 0;
1252 struct ip6_tnl_parm2 p;
1253 struct __ip6_tnl_parm p1;
1254 struct ip6_tnl *t = netdev_priv(dev);
1255 struct net *net = t->net;
1256 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1257
1258 memset(&p1, 0, sizeof(p1));
1259
1260 switch (cmd) {
1261 case SIOCGETTUNNEL:
1262 if (dev == ign->fb_tunnel_dev) {
1263 if (copy_from_user(&p, data, sizeof(p))) {
1264 err = -EFAULT;
1265 break;
1266 }
1267 ip6gre_tnl_parm_from_user(&p1, &p);
1268 t = ip6gre_tunnel_locate(net, &p1, 0);
1269 if (!t)
1270 t = netdev_priv(dev);
1271 }
1272 memset(&p, 0, sizeof(p));
1273 ip6gre_tnl_parm_to_user(&p, &t->parms);
1274 if (copy_to_user(data, &p, sizeof(p)))
1275 err = -EFAULT;
1276 break;
1277
1278 case SIOCADDTUNNEL:
1279 case SIOCCHGTUNNEL:
1280 err = -EPERM;
1281 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1282 goto done;
1283
1284 err = -EFAULT;
1285 if (copy_from_user(&p, data, sizeof(p)))
1286 goto done;
1287
1288 err = -EINVAL;
1289 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1290 goto done;
1291
1292 if (!(p.i_flags&GRE_KEY))
1293 p.i_key = 0;
1294 if (!(p.o_flags&GRE_KEY))
1295 p.o_key = 0;
1296
1297 ip6gre_tnl_parm_from_user(&p1, &p);
1298 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1299
1300 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1301 if (t) {
1302 if (t->dev != dev) {
1303 err = -EEXIST;
1304 break;
1305 }
1306 } else {
1307 t = netdev_priv(dev);
1308
1309 ip6gre_tunnel_unlink(ign, t);
1310 synchronize_net();
1311 ip6gre_tnl_change(t, &p1, 1);
1312 ip6gre_tunnel_link(ign, t);
1313 netdev_state_change(dev);
1314 }
1315 }
1316
1317 if (t) {
1318 err = 0;
1319
1320 memset(&p, 0, sizeof(p));
1321 ip6gre_tnl_parm_to_user(&p, &t->parms);
1322 if (copy_to_user(data, &p, sizeof(p)))
1323 err = -EFAULT;
1324 } else
1325 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1326 break;
1327
1328 case SIOCDELTUNNEL:
1329 err = -EPERM;
1330 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1331 goto done;
1332
1333 if (dev == ign->fb_tunnel_dev) {
1334 err = -EFAULT;
1335 if (copy_from_user(&p, data, sizeof(p)))
1336 goto done;
1337 err = -ENOENT;
1338 ip6gre_tnl_parm_from_user(&p1, &p);
1339 t = ip6gre_tunnel_locate(net, &p1, 0);
1340 if (!t)
1341 goto done;
1342 err = -EPERM;
1343 if (t == netdev_priv(ign->fb_tunnel_dev))
1344 goto done;
1345 dev = t->dev;
1346 }
1347 unregister_netdevice(dev);
1348 err = 0;
1349 break;
1350
1351 default:
1352 err = -EINVAL;
1353 }
1354
1355 done:
1356 return err;
1357 }
1358
ip6gre_header(struct sk_buff * skb,struct net_device * dev,unsigned short type,const void * daddr,const void * saddr,unsigned int len)1359 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1360 unsigned short type, const void *daddr,
1361 const void *saddr, unsigned int len)
1362 {
1363 struct ip6_tnl *t = netdev_priv(dev);
1364 struct ipv6hdr *ipv6h;
1365 __be16 *p;
1366
1367 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1368 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1369 t->fl.u.ip6.flowlabel,
1370 true, &t->fl.u.ip6));
1371 ipv6h->hop_limit = t->parms.hop_limit;
1372 ipv6h->nexthdr = NEXTHDR_GRE;
1373 ipv6h->saddr = t->parms.laddr;
1374 ipv6h->daddr = t->parms.raddr;
1375
1376 p = (__be16 *)(ipv6h + 1);
1377 p[0] = t->parms.o_flags;
1378 p[1] = htons(type);
1379
1380 /*
1381 * Set the source hardware address.
1382 */
1383
1384 if (saddr)
1385 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1386 if (daddr)
1387 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1388 if (!ipv6_addr_any(&ipv6h->daddr))
1389 return t->hlen;
1390
1391 return -t->hlen;
1392 }
1393
1394 static const struct header_ops ip6gre_header_ops = {
1395 .create = ip6gre_header,
1396 };
1397
1398 static const struct net_device_ops ip6gre_netdev_ops = {
1399 .ndo_init = ip6gre_tunnel_init,
1400 .ndo_uninit = ip6gre_tunnel_uninit,
1401 .ndo_start_xmit = ip6gre_tunnel_xmit,
1402 .ndo_siocdevprivate = ip6gre_tunnel_siocdevprivate,
1403 .ndo_change_mtu = ip6_tnl_change_mtu,
1404 .ndo_get_stats64 = dev_get_tstats64,
1405 .ndo_get_iflink = ip6_tnl_get_iflink,
1406 };
1407
ip6gre_dev_free(struct net_device * dev)1408 static void ip6gre_dev_free(struct net_device *dev)
1409 {
1410 struct ip6_tnl *t = netdev_priv(dev);
1411
1412 gro_cells_destroy(&t->gro_cells);
1413 dst_cache_destroy(&t->dst_cache);
1414 free_percpu(dev->tstats);
1415 }
1416
ip6gre_tunnel_setup(struct net_device * dev)1417 static void ip6gre_tunnel_setup(struct net_device *dev)
1418 {
1419 dev->netdev_ops = &ip6gre_netdev_ops;
1420 dev->needs_free_netdev = true;
1421 dev->priv_destructor = ip6gre_dev_free;
1422
1423 dev->type = ARPHRD_IP6GRE;
1424
1425 dev->flags |= IFF_NOARP;
1426 dev->addr_len = sizeof(struct in6_addr);
1427 netif_keep_dst(dev);
1428 /* This perm addr will be used as interface identifier by IPv6 */
1429 dev->addr_assign_type = NET_ADDR_RANDOM;
1430 eth_random_addr(dev->perm_addr);
1431 }
1432
1433 #define GRE6_FEATURES (NETIF_F_SG | \
1434 NETIF_F_FRAGLIST | \
1435 NETIF_F_HIGHDMA | \
1436 NETIF_F_HW_CSUM)
1437
ip6gre_tnl_init_features(struct net_device * dev)1438 static void ip6gre_tnl_init_features(struct net_device *dev)
1439 {
1440 struct ip6_tnl *nt = netdev_priv(dev);
1441
1442 dev->features |= GRE6_FEATURES;
1443 dev->hw_features |= GRE6_FEATURES;
1444
1445 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1446 /* TCP offload with GRE SEQ is not supported, nor
1447 * can we support 2 levels of outer headers requiring
1448 * an update.
1449 */
1450 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1451 nt->encap.type == TUNNEL_ENCAP_NONE) {
1452 dev->features |= NETIF_F_GSO_SOFTWARE;
1453 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1454 }
1455
1456 /* Can use a lockless transmit, unless we generate
1457 * output sequences
1458 */
1459 dev->features |= NETIF_F_LLTX;
1460 }
1461 }
1462
ip6gre_tunnel_init_common(struct net_device * dev)1463 static int ip6gre_tunnel_init_common(struct net_device *dev)
1464 {
1465 struct ip6_tnl *tunnel;
1466 int ret;
1467 int t_hlen;
1468
1469 tunnel = netdev_priv(dev);
1470
1471 tunnel->dev = dev;
1472 tunnel->net = dev_net(dev);
1473 strcpy(tunnel->parms.name, dev->name);
1474
1475 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1476 if (!dev->tstats)
1477 return -ENOMEM;
1478
1479 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1480 if (ret)
1481 goto cleanup_alloc_pcpu_stats;
1482
1483 ret = gro_cells_init(&tunnel->gro_cells, dev);
1484 if (ret)
1485 goto cleanup_dst_cache_init;
1486
1487 t_hlen = ip6gre_calc_hlen(tunnel);
1488 dev->mtu = ETH_DATA_LEN - t_hlen;
1489 if (dev->type == ARPHRD_ETHER)
1490 dev->mtu -= ETH_HLEN;
1491 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1492 dev->mtu -= 8;
1493
1494 if (tunnel->parms.collect_md) {
1495 netif_keep_dst(dev);
1496 }
1497 ip6gre_tnl_init_features(dev);
1498
1499 dev_hold(dev);
1500 return 0;
1501
1502 cleanup_dst_cache_init:
1503 dst_cache_destroy(&tunnel->dst_cache);
1504 cleanup_alloc_pcpu_stats:
1505 free_percpu(dev->tstats);
1506 dev->tstats = NULL;
1507 return ret;
1508 }
1509
ip6gre_tunnel_init(struct net_device * dev)1510 static int ip6gre_tunnel_init(struct net_device *dev)
1511 {
1512 struct ip6_tnl *tunnel;
1513 int ret;
1514
1515 ret = ip6gre_tunnel_init_common(dev);
1516 if (ret)
1517 return ret;
1518
1519 tunnel = netdev_priv(dev);
1520
1521 if (tunnel->parms.collect_md)
1522 return 0;
1523
1524 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1525 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1526
1527 if (ipv6_addr_any(&tunnel->parms.raddr))
1528 dev->header_ops = &ip6gre_header_ops;
1529
1530 return 0;
1531 }
1532
ip6gre_fb_tunnel_init(struct net_device * dev)1533 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1534 {
1535 struct ip6_tnl *tunnel = netdev_priv(dev);
1536
1537 tunnel->dev = dev;
1538 tunnel->net = dev_net(dev);
1539 strcpy(tunnel->parms.name, dev->name);
1540
1541 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1542 }
1543
1544 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1545 .handler = gre_rcv,
1546 .err_handler = ip6gre_err,
1547 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1548 };
1549
ip6gre_destroy_tunnels(struct net * net,struct list_head * head)1550 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1551 {
1552 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1553 struct net_device *dev, *aux;
1554 int prio;
1555
1556 for_each_netdev_safe(net, dev, aux)
1557 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1558 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1559 dev->rtnl_link_ops == &ip6erspan_tap_ops)
1560 unregister_netdevice_queue(dev, head);
1561
1562 for (prio = 0; prio < 4; prio++) {
1563 int h;
1564 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1565 struct ip6_tnl *t;
1566
1567 t = rtnl_dereference(ign->tunnels[prio][h]);
1568
1569 while (t) {
1570 /* If dev is in the same netns, it has already
1571 * been added to the list by the previous loop.
1572 */
1573 if (!net_eq(dev_net(t->dev), net))
1574 unregister_netdevice_queue(t->dev,
1575 head);
1576 t = rtnl_dereference(t->next);
1577 }
1578 }
1579 }
1580 }
1581
ip6gre_init_net(struct net * net)1582 static int __net_init ip6gre_init_net(struct net *net)
1583 {
1584 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1585 struct net_device *ndev;
1586 int err;
1587
1588 if (!net_has_fallback_tunnels(net))
1589 return 0;
1590 ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1591 NET_NAME_UNKNOWN, ip6gre_tunnel_setup);
1592 if (!ndev) {
1593 err = -ENOMEM;
1594 goto err_alloc_dev;
1595 }
1596 ign->fb_tunnel_dev = ndev;
1597 dev_net_set(ign->fb_tunnel_dev, net);
1598 /* FB netdevice is special: we have one, and only one per netns.
1599 * Allowing to move it to another netns is clearly unsafe.
1600 */
1601 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1602
1603
1604 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1605 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1606
1607 err = register_netdev(ign->fb_tunnel_dev);
1608 if (err)
1609 goto err_reg_dev;
1610
1611 rcu_assign_pointer(ign->tunnels_wc[0],
1612 netdev_priv(ign->fb_tunnel_dev));
1613 return 0;
1614
1615 err_reg_dev:
1616 free_netdev(ndev);
1617 err_alloc_dev:
1618 return err;
1619 }
1620
ip6gre_exit_batch_net(struct list_head * net_list)1621 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1622 {
1623 struct net *net;
1624 LIST_HEAD(list);
1625
1626 rtnl_lock();
1627 list_for_each_entry(net, net_list, exit_list)
1628 ip6gre_destroy_tunnels(net, &list);
1629 unregister_netdevice_many(&list);
1630 rtnl_unlock();
1631 }
1632
1633 static struct pernet_operations ip6gre_net_ops = {
1634 .init = ip6gre_init_net,
1635 .exit_batch = ip6gre_exit_batch_net,
1636 .id = &ip6gre_net_id,
1637 .size = sizeof(struct ip6gre_net),
1638 };
1639
ip6gre_tunnel_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1640 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1641 struct netlink_ext_ack *extack)
1642 {
1643 __be16 flags;
1644
1645 if (!data)
1646 return 0;
1647
1648 flags = 0;
1649 if (data[IFLA_GRE_IFLAGS])
1650 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1651 if (data[IFLA_GRE_OFLAGS])
1652 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1653 if (flags & (GRE_VERSION|GRE_ROUTING))
1654 return -EINVAL;
1655
1656 return 0;
1657 }
1658
ip6gre_tap_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1659 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1660 struct netlink_ext_ack *extack)
1661 {
1662 struct in6_addr daddr;
1663
1664 if (tb[IFLA_ADDRESS]) {
1665 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1666 return -EINVAL;
1667 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1668 return -EADDRNOTAVAIL;
1669 }
1670
1671 if (!data)
1672 goto out;
1673
1674 if (data[IFLA_GRE_REMOTE]) {
1675 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1676 if (ipv6_addr_any(&daddr))
1677 return -EINVAL;
1678 }
1679
1680 out:
1681 return ip6gre_tunnel_validate(tb, data, extack);
1682 }
1683
ip6erspan_tap_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1684 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1685 struct netlink_ext_ack *extack)
1686 {
1687 __be16 flags = 0;
1688 int ret, ver = 0;
1689
1690 if (!data)
1691 return 0;
1692
1693 ret = ip6gre_tap_validate(tb, data, extack);
1694 if (ret)
1695 return ret;
1696
1697 /* ERSPAN should only have GRE sequence and key flag */
1698 if (data[IFLA_GRE_OFLAGS])
1699 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1700 if (data[IFLA_GRE_IFLAGS])
1701 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1702 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1703 flags != (GRE_SEQ | GRE_KEY))
1704 return -EINVAL;
1705
1706 /* ERSPAN Session ID only has 10-bit. Since we reuse
1707 * 32-bit key field as ID, check it's range.
1708 */
1709 if (data[IFLA_GRE_IKEY] &&
1710 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1711 return -EINVAL;
1712
1713 if (data[IFLA_GRE_OKEY] &&
1714 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1715 return -EINVAL;
1716
1717 if (data[IFLA_GRE_ERSPAN_VER]) {
1718 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1719 if (ver != 1 && ver != 2)
1720 return -EINVAL;
1721 }
1722
1723 if (ver == 1) {
1724 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1725 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1726
1727 if (index & ~INDEX_MASK)
1728 return -EINVAL;
1729 }
1730 } else if (ver == 2) {
1731 if (data[IFLA_GRE_ERSPAN_DIR]) {
1732 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1733
1734 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1735 return -EINVAL;
1736 }
1737
1738 if (data[IFLA_GRE_ERSPAN_HWID]) {
1739 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1740
1741 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1742 return -EINVAL;
1743 }
1744 }
1745
1746 return 0;
1747 }
1748
ip6erspan_set_version(struct nlattr * data[],struct __ip6_tnl_parm * parms)1749 static void ip6erspan_set_version(struct nlattr *data[],
1750 struct __ip6_tnl_parm *parms)
1751 {
1752 if (!data)
1753 return;
1754
1755 parms->erspan_ver = 1;
1756 if (data[IFLA_GRE_ERSPAN_VER])
1757 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1758
1759 if (parms->erspan_ver == 1) {
1760 if (data[IFLA_GRE_ERSPAN_INDEX])
1761 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1762 } else if (parms->erspan_ver == 2) {
1763 if (data[IFLA_GRE_ERSPAN_DIR])
1764 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1765 if (data[IFLA_GRE_ERSPAN_HWID])
1766 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1767 }
1768 }
1769
ip6gre_netlink_parms(struct nlattr * data[],struct __ip6_tnl_parm * parms)1770 static void ip6gre_netlink_parms(struct nlattr *data[],
1771 struct __ip6_tnl_parm *parms)
1772 {
1773 memset(parms, 0, sizeof(*parms));
1774
1775 if (!data)
1776 return;
1777
1778 if (data[IFLA_GRE_LINK])
1779 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1780
1781 if (data[IFLA_GRE_IFLAGS])
1782 parms->i_flags = gre_flags_to_tnl_flags(
1783 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1784
1785 if (data[IFLA_GRE_OFLAGS])
1786 parms->o_flags = gre_flags_to_tnl_flags(
1787 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1788
1789 if (data[IFLA_GRE_IKEY])
1790 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1791
1792 if (data[IFLA_GRE_OKEY])
1793 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1794
1795 if (data[IFLA_GRE_LOCAL])
1796 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1797
1798 if (data[IFLA_GRE_REMOTE])
1799 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1800
1801 if (data[IFLA_GRE_TTL])
1802 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1803
1804 if (data[IFLA_GRE_ENCAP_LIMIT])
1805 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1806
1807 if (data[IFLA_GRE_FLOWINFO])
1808 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1809
1810 if (data[IFLA_GRE_FLAGS])
1811 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1812
1813 if (data[IFLA_GRE_FWMARK])
1814 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1815
1816 if (data[IFLA_GRE_COLLECT_METADATA])
1817 parms->collect_md = true;
1818 }
1819
ip6gre_tap_init(struct net_device * dev)1820 static int ip6gre_tap_init(struct net_device *dev)
1821 {
1822 int ret;
1823
1824 ret = ip6gre_tunnel_init_common(dev);
1825 if (ret)
1826 return ret;
1827
1828 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1829
1830 return 0;
1831 }
1832
1833 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1834 .ndo_init = ip6gre_tap_init,
1835 .ndo_uninit = ip6gre_tunnel_uninit,
1836 .ndo_start_xmit = ip6gre_tunnel_xmit,
1837 .ndo_set_mac_address = eth_mac_addr,
1838 .ndo_validate_addr = eth_validate_addr,
1839 .ndo_change_mtu = ip6_tnl_change_mtu,
1840 .ndo_get_stats64 = dev_get_tstats64,
1841 .ndo_get_iflink = ip6_tnl_get_iflink,
1842 };
1843
ip6erspan_calc_hlen(struct ip6_tnl * tunnel)1844 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1845 {
1846 int t_hlen;
1847
1848 tunnel->tun_hlen = 8;
1849 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1850 erspan_hdr_len(tunnel->parms.erspan_ver);
1851
1852 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1853 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1854 return t_hlen;
1855 }
1856
ip6erspan_tap_init(struct net_device * dev)1857 static int ip6erspan_tap_init(struct net_device *dev)
1858 {
1859 struct ip6_tnl *tunnel;
1860 int t_hlen;
1861 int ret;
1862
1863 tunnel = netdev_priv(dev);
1864
1865 tunnel->dev = dev;
1866 tunnel->net = dev_net(dev);
1867 strcpy(tunnel->parms.name, dev->name);
1868
1869 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1870 if (!dev->tstats)
1871 return -ENOMEM;
1872
1873 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1874 if (ret)
1875 goto cleanup_alloc_pcpu_stats;
1876
1877 ret = gro_cells_init(&tunnel->gro_cells, dev);
1878 if (ret)
1879 goto cleanup_dst_cache_init;
1880
1881 t_hlen = ip6erspan_calc_hlen(tunnel);
1882 dev->mtu = ETH_DATA_LEN - t_hlen;
1883 if (dev->type == ARPHRD_ETHER)
1884 dev->mtu -= ETH_HLEN;
1885 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1886 dev->mtu -= 8;
1887
1888 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1889 ip6erspan_tnl_link_config(tunnel, 1);
1890
1891 dev_hold(dev);
1892 return 0;
1893
1894 cleanup_dst_cache_init:
1895 dst_cache_destroy(&tunnel->dst_cache);
1896 cleanup_alloc_pcpu_stats:
1897 free_percpu(dev->tstats);
1898 dev->tstats = NULL;
1899 return ret;
1900 }
1901
1902 static const struct net_device_ops ip6erspan_netdev_ops = {
1903 .ndo_init = ip6erspan_tap_init,
1904 .ndo_uninit = ip6erspan_tunnel_uninit,
1905 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1906 .ndo_set_mac_address = eth_mac_addr,
1907 .ndo_validate_addr = eth_validate_addr,
1908 .ndo_change_mtu = ip6_tnl_change_mtu,
1909 .ndo_get_stats64 = dev_get_tstats64,
1910 .ndo_get_iflink = ip6_tnl_get_iflink,
1911 };
1912
ip6gre_tap_setup(struct net_device * dev)1913 static void ip6gre_tap_setup(struct net_device *dev)
1914 {
1915
1916 ether_setup(dev);
1917
1918 dev->max_mtu = 0;
1919 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1920 dev->needs_free_netdev = true;
1921 dev->priv_destructor = ip6gre_dev_free;
1922
1923 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1924 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1925 netif_keep_dst(dev);
1926 }
1927
ip6gre_netlink_encap_parms(struct nlattr * data[],struct ip_tunnel_encap * ipencap)1928 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1929 struct ip_tunnel_encap *ipencap)
1930 {
1931 bool ret = false;
1932
1933 memset(ipencap, 0, sizeof(*ipencap));
1934
1935 if (!data)
1936 return ret;
1937
1938 if (data[IFLA_GRE_ENCAP_TYPE]) {
1939 ret = true;
1940 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1941 }
1942
1943 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1944 ret = true;
1945 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1946 }
1947
1948 if (data[IFLA_GRE_ENCAP_SPORT]) {
1949 ret = true;
1950 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1951 }
1952
1953 if (data[IFLA_GRE_ENCAP_DPORT]) {
1954 ret = true;
1955 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1956 }
1957
1958 return ret;
1959 }
1960
ip6gre_newlink_common(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1961 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1962 struct nlattr *tb[], struct nlattr *data[],
1963 struct netlink_ext_ack *extack)
1964 {
1965 struct ip6_tnl *nt;
1966 struct ip_tunnel_encap ipencap;
1967 int err;
1968
1969 nt = netdev_priv(dev);
1970
1971 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1972 int err = ip6_tnl_encap_setup(nt, &ipencap);
1973
1974 if (err < 0)
1975 return err;
1976 }
1977
1978 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1979 eth_hw_addr_random(dev);
1980
1981 nt->dev = dev;
1982 nt->net = dev_net(dev);
1983
1984 err = register_netdevice(dev);
1985 if (err)
1986 goto out;
1987
1988 if (tb[IFLA_MTU])
1989 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1990
1991 out:
1992 return err;
1993 }
1994
ip6gre_newlink(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1995 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1996 struct nlattr *tb[], struct nlattr *data[],
1997 struct netlink_ext_ack *extack)
1998 {
1999 struct ip6_tnl *nt = netdev_priv(dev);
2000 struct net *net = dev_net(dev);
2001 struct ip6gre_net *ign;
2002 int err;
2003
2004 ip6gre_netlink_parms(data, &nt->parms);
2005 ign = net_generic(net, ip6gre_net_id);
2006
2007 if (nt->parms.collect_md) {
2008 if (rtnl_dereference(ign->collect_md_tun))
2009 return -EEXIST;
2010 } else {
2011 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2012 return -EEXIST;
2013 }
2014
2015 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2016 if (!err) {
2017 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
2018 ip6gre_tunnel_link_md(ign, nt);
2019 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2020 }
2021 return err;
2022 }
2023
2024 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)2025 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2026 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2027 struct netlink_ext_ack *extack)
2028 {
2029 struct ip6_tnl *t, *nt = netdev_priv(dev);
2030 struct net *net = nt->net;
2031 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2032 struct ip_tunnel_encap ipencap;
2033
2034 if (dev == ign->fb_tunnel_dev)
2035 return ERR_PTR(-EINVAL);
2036
2037 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2038 int err = ip6_tnl_encap_setup(nt, &ipencap);
2039
2040 if (err < 0)
2041 return ERR_PTR(err);
2042 }
2043
2044 ip6gre_netlink_parms(data, p_p);
2045
2046 t = ip6gre_tunnel_locate(net, p_p, 0);
2047
2048 if (t) {
2049 if (t->dev != dev)
2050 return ERR_PTR(-EEXIST);
2051 } else {
2052 t = nt;
2053 }
2054
2055 return t;
2056 }
2057
ip6gre_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2058 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2059 struct nlattr *data[],
2060 struct netlink_ext_ack *extack)
2061 {
2062 struct ip6_tnl *t = netdev_priv(dev);
2063 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2064 struct __ip6_tnl_parm p;
2065
2066 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2067 if (IS_ERR(t))
2068 return PTR_ERR(t);
2069
2070 ip6gre_tunnel_unlink_md(ign, t);
2071 ip6gre_tunnel_unlink(ign, t);
2072 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2073 ip6gre_tunnel_link_md(ign, t);
2074 ip6gre_tunnel_link(ign, t);
2075 return 0;
2076 }
2077
ip6gre_dellink(struct net_device * dev,struct list_head * head)2078 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2079 {
2080 struct net *net = dev_net(dev);
2081 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2082
2083 if (dev != ign->fb_tunnel_dev)
2084 unregister_netdevice_queue(dev, head);
2085 }
2086
ip6gre_get_size(const struct net_device * dev)2087 static size_t ip6gre_get_size(const struct net_device *dev)
2088 {
2089 return
2090 /* IFLA_GRE_LINK */
2091 nla_total_size(4) +
2092 /* IFLA_GRE_IFLAGS */
2093 nla_total_size(2) +
2094 /* IFLA_GRE_OFLAGS */
2095 nla_total_size(2) +
2096 /* IFLA_GRE_IKEY */
2097 nla_total_size(4) +
2098 /* IFLA_GRE_OKEY */
2099 nla_total_size(4) +
2100 /* IFLA_GRE_LOCAL */
2101 nla_total_size(sizeof(struct in6_addr)) +
2102 /* IFLA_GRE_REMOTE */
2103 nla_total_size(sizeof(struct in6_addr)) +
2104 /* IFLA_GRE_TTL */
2105 nla_total_size(1) +
2106 /* IFLA_GRE_ENCAP_LIMIT */
2107 nla_total_size(1) +
2108 /* IFLA_GRE_FLOWINFO */
2109 nla_total_size(4) +
2110 /* IFLA_GRE_FLAGS */
2111 nla_total_size(4) +
2112 /* IFLA_GRE_ENCAP_TYPE */
2113 nla_total_size(2) +
2114 /* IFLA_GRE_ENCAP_FLAGS */
2115 nla_total_size(2) +
2116 /* IFLA_GRE_ENCAP_SPORT */
2117 nla_total_size(2) +
2118 /* IFLA_GRE_ENCAP_DPORT */
2119 nla_total_size(2) +
2120 /* IFLA_GRE_COLLECT_METADATA */
2121 nla_total_size(0) +
2122 /* IFLA_GRE_FWMARK */
2123 nla_total_size(4) +
2124 /* IFLA_GRE_ERSPAN_INDEX */
2125 nla_total_size(4) +
2126 0;
2127 }
2128
ip6gre_fill_info(struct sk_buff * skb,const struct net_device * dev)2129 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2130 {
2131 struct ip6_tnl *t = netdev_priv(dev);
2132 struct __ip6_tnl_parm *p = &t->parms;
2133 __be16 o_flags = p->o_flags;
2134
2135 if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2136 if (!p->collect_md)
2137 o_flags |= TUNNEL_KEY;
2138
2139 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2140 goto nla_put_failure;
2141
2142 if (p->erspan_ver == 1) {
2143 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2144 goto nla_put_failure;
2145 } else {
2146 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2147 goto nla_put_failure;
2148 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2149 goto nla_put_failure;
2150 }
2151 }
2152
2153 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2154 nla_put_be16(skb, IFLA_GRE_IFLAGS,
2155 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2156 nla_put_be16(skb, IFLA_GRE_OFLAGS,
2157 gre_tnl_flags_to_gre_flags(o_flags)) ||
2158 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2159 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2160 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2161 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2162 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2163 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2164 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2165 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2166 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
2167 goto nla_put_failure;
2168
2169 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2170 t->encap.type) ||
2171 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2172 t->encap.sport) ||
2173 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2174 t->encap.dport) ||
2175 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2176 t->encap.flags))
2177 goto nla_put_failure;
2178
2179 if (p->collect_md) {
2180 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2181 goto nla_put_failure;
2182 }
2183
2184 return 0;
2185
2186 nla_put_failure:
2187 return -EMSGSIZE;
2188 }
2189
2190 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2191 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2192 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2193 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2194 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2195 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2196 [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct ipv6hdr, saddr) },
2197 [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct ipv6hdr, daddr) },
2198 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2199 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2200 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2201 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
2202 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2203 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2204 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2205 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
2206 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2207 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
2208 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2209 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2210 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2211 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
2212 };
2213
ip6erspan_tap_setup(struct net_device * dev)2214 static void ip6erspan_tap_setup(struct net_device *dev)
2215 {
2216 ether_setup(dev);
2217
2218 dev->max_mtu = 0;
2219 dev->netdev_ops = &ip6erspan_netdev_ops;
2220 dev->needs_free_netdev = true;
2221 dev->priv_destructor = ip6gre_dev_free;
2222
2223 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2224 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2225 netif_keep_dst(dev);
2226 }
2227
ip6erspan_newlink(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2228 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2229 struct nlattr *tb[], struct nlattr *data[],
2230 struct netlink_ext_ack *extack)
2231 {
2232 struct ip6_tnl *nt = netdev_priv(dev);
2233 struct net *net = dev_net(dev);
2234 struct ip6gre_net *ign;
2235 int err;
2236
2237 ip6gre_netlink_parms(data, &nt->parms);
2238 ip6erspan_set_version(data, &nt->parms);
2239 ign = net_generic(net, ip6gre_net_id);
2240
2241 if (nt->parms.collect_md) {
2242 if (rtnl_dereference(ign->collect_md_tun_erspan))
2243 return -EEXIST;
2244 } else {
2245 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2246 return -EEXIST;
2247 }
2248
2249 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2250 if (!err) {
2251 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2252 ip6erspan_tunnel_link_md(ign, nt);
2253 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2254 }
2255 return err;
2256 }
2257
ip6erspan_tnl_link_config(struct ip6_tnl * t,int set_mtu)2258 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2259 {
2260 ip6gre_tnl_link_config_common(t);
2261 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2262 }
2263
ip6erspan_tnl_change(struct ip6_tnl * t,const struct __ip6_tnl_parm * p,int set_mtu)2264 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2265 const struct __ip6_tnl_parm *p, int set_mtu)
2266 {
2267 ip6gre_tnl_copy_tnl_parm(t, p);
2268 ip6erspan_tnl_link_config(t, set_mtu);
2269 return 0;
2270 }
2271
ip6erspan_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2272 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2273 struct nlattr *data[],
2274 struct netlink_ext_ack *extack)
2275 {
2276 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2277 struct __ip6_tnl_parm p;
2278 struct ip6_tnl *t;
2279
2280 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2281 if (IS_ERR(t))
2282 return PTR_ERR(t);
2283
2284 ip6erspan_set_version(data, &p);
2285 ip6gre_tunnel_unlink_md(ign, t);
2286 ip6gre_tunnel_unlink(ign, t);
2287 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2288 ip6erspan_tunnel_link_md(ign, t);
2289 ip6gre_tunnel_link(ign, t);
2290 return 0;
2291 }
2292
2293 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2294 .kind = "ip6gre",
2295 .maxtype = IFLA_GRE_MAX,
2296 .policy = ip6gre_policy,
2297 .priv_size = sizeof(struct ip6_tnl),
2298 .setup = ip6gre_tunnel_setup,
2299 .validate = ip6gre_tunnel_validate,
2300 .newlink = ip6gre_newlink,
2301 .changelink = ip6gre_changelink,
2302 .dellink = ip6gre_dellink,
2303 .get_size = ip6gre_get_size,
2304 .fill_info = ip6gre_fill_info,
2305 .get_link_net = ip6_tnl_get_link_net,
2306 };
2307
2308 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2309 .kind = "ip6gretap",
2310 .maxtype = IFLA_GRE_MAX,
2311 .policy = ip6gre_policy,
2312 .priv_size = sizeof(struct ip6_tnl),
2313 .setup = ip6gre_tap_setup,
2314 .validate = ip6gre_tap_validate,
2315 .newlink = ip6gre_newlink,
2316 .changelink = ip6gre_changelink,
2317 .get_size = ip6gre_get_size,
2318 .fill_info = ip6gre_fill_info,
2319 .get_link_net = ip6_tnl_get_link_net,
2320 };
2321
2322 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2323 .kind = "ip6erspan",
2324 .maxtype = IFLA_GRE_MAX,
2325 .policy = ip6gre_policy,
2326 .priv_size = sizeof(struct ip6_tnl),
2327 .setup = ip6erspan_tap_setup,
2328 .validate = ip6erspan_tap_validate,
2329 .newlink = ip6erspan_newlink,
2330 .changelink = ip6erspan_changelink,
2331 .get_size = ip6gre_get_size,
2332 .fill_info = ip6gre_fill_info,
2333 .get_link_net = ip6_tnl_get_link_net,
2334 };
2335
2336 /*
2337 * And now the modules code and kernel interface.
2338 */
2339
ip6gre_init(void)2340 static int __init ip6gre_init(void)
2341 {
2342 int err;
2343
2344 pr_info("GRE over IPv6 tunneling driver\n");
2345
2346 err = register_pernet_device(&ip6gre_net_ops);
2347 if (err < 0)
2348 return err;
2349
2350 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2351 if (err < 0) {
2352 pr_info("%s: can't add protocol\n", __func__);
2353 goto add_proto_failed;
2354 }
2355
2356 err = rtnl_link_register(&ip6gre_link_ops);
2357 if (err < 0)
2358 goto rtnl_link_failed;
2359
2360 err = rtnl_link_register(&ip6gre_tap_ops);
2361 if (err < 0)
2362 goto tap_ops_failed;
2363
2364 err = rtnl_link_register(&ip6erspan_tap_ops);
2365 if (err < 0)
2366 goto erspan_link_failed;
2367
2368 out:
2369 return err;
2370
2371 erspan_link_failed:
2372 rtnl_link_unregister(&ip6gre_tap_ops);
2373 tap_ops_failed:
2374 rtnl_link_unregister(&ip6gre_link_ops);
2375 rtnl_link_failed:
2376 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2377 add_proto_failed:
2378 unregister_pernet_device(&ip6gre_net_ops);
2379 goto out;
2380 }
2381
ip6gre_fini(void)2382 static void __exit ip6gre_fini(void)
2383 {
2384 rtnl_link_unregister(&ip6gre_tap_ops);
2385 rtnl_link_unregister(&ip6gre_link_ops);
2386 rtnl_link_unregister(&ip6erspan_tap_ops);
2387 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2388 unregister_pernet_device(&ip6gre_net_ops);
2389 }
2390
2391 module_init(ip6gre_init);
2392 module_exit(ip6gre_fini);
2393 MODULE_LICENSE("GPL");
2394 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2395 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2396 MODULE_ALIAS_RTNL_LINK("ip6gre");
2397 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2398 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2399 MODULE_ALIAS_NETDEV("ip6gre0");
2400
