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 __be16 flags;
728
729 if (dev->type == ARPHRD_ETHER)
730 IPCB(skb)->flags = 0;
731
732 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
733 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
734 else
735 fl6->daddr = tunnel->parms.raddr;
736
737 /* Push GRE header. */
738 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
739
740 if (tunnel->parms.collect_md) {
741 struct ip_tunnel_info *tun_info;
742 const struct ip_tunnel_key *key;
743 int tun_hlen;
744
745 tun_info = skb_tunnel_info_txcheck(skb);
746 if (IS_ERR(tun_info) ||
747 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
748 return -EINVAL;
749
750 key = &tun_info->key;
751 memset(fl6, 0, sizeof(*fl6));
752 fl6->flowi6_proto = IPPROTO_GRE;
753 fl6->daddr = key->u.ipv6.dst;
754 fl6->flowlabel = key->label;
755 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
756 fl6->fl6_gre_key = tunnel_id_to_key32(key->tun_id);
757
758 dsfield = key->tos;
759 flags = key->tun_flags &
760 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
761 tun_hlen = gre_calc_hlen(flags);
762
763 if (skb_cow_head(skb, dev->needed_headroom ?: tun_hlen + tunnel->encap_hlen))
764 return -ENOMEM;
765
766 gre_build_header(skb, tun_hlen,
767 flags, protocol,
768 tunnel_id_to_key32(tun_info->key.tun_id),
769 (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno))
770 : 0);
771
772 } else {
773 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
774 return -ENOMEM;
775
776 flags = tunnel->parms.o_flags;
777
778 gre_build_header(skb, tunnel->tun_hlen, flags,
779 protocol, tunnel->parms.o_key,
780 (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno))
781 : 0);
782 }
783
784 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
785 NEXTHDR_GRE);
786 }
787
ip6gre_xmit_ipv4(struct sk_buff * skb,struct net_device * dev)788 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
789 {
790 struct ip6_tnl *t = netdev_priv(dev);
791 int encap_limit = -1;
792 struct flowi6 fl6;
793 __u8 dsfield = 0;
794 __u32 mtu;
795 int err;
796
797 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
798
799 if (!t->parms.collect_md)
800 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
801 &dsfield, &encap_limit);
802
803 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
804 if (err)
805 return -1;
806
807 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
808 skb->protocol);
809 if (err != 0) {
810 /* XXX: send ICMP error even if DF is not set. */
811 if (err == -EMSGSIZE)
812 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
813 htonl(mtu));
814 return -1;
815 }
816
817 return 0;
818 }
819
ip6gre_xmit_ipv6(struct sk_buff * skb,struct net_device * dev)820 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
821 {
822 struct ip6_tnl *t = netdev_priv(dev);
823 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
824 int encap_limit = -1;
825 struct flowi6 fl6;
826 __u8 dsfield = 0;
827 __u32 mtu;
828 int err;
829
830 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
831 return -1;
832
833 if (!t->parms.collect_md &&
834 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
835 return -1;
836
837 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
838 return -1;
839
840 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
841 &mtu, skb->protocol);
842 if (err != 0) {
843 if (err == -EMSGSIZE)
844 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
845 return -1;
846 }
847
848 return 0;
849 }
850
851 /**
852 * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own
853 * @t: the outgoing tunnel device
854 * @hdr: IPv6 header from the incoming packet
855 *
856 * Description:
857 * Avoid trivial tunneling loop by checking that tunnel exit-point
858 * doesn't match source of incoming packet.
859 *
860 * Return:
861 * 1 if conflict,
862 * 0 else
863 **/
864
ip6gre_tnl_addr_conflict(const struct ip6_tnl * t,const struct ipv6hdr * hdr)865 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
866 const struct ipv6hdr *hdr)
867 {
868 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
869 }
870
ip6gre_xmit_other(struct sk_buff * skb,struct net_device * dev)871 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
872 {
873 struct ip6_tnl *t = netdev_priv(dev);
874 int encap_limit = -1;
875 struct flowi6 fl6;
876 __u32 mtu;
877 int err;
878
879 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
880 encap_limit = t->parms.encap_limit;
881
882 if (!t->parms.collect_md)
883 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
884
885 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
886 if (err)
887 return err;
888
889 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
890
891 return err;
892 }
893
ip6gre_tunnel_xmit(struct sk_buff * skb,struct net_device * dev)894 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
895 struct net_device *dev)
896 {
897 struct ip6_tnl *t = netdev_priv(dev);
898 struct net_device_stats *stats = &t->dev->stats;
899 int ret;
900
901 if (!pskb_inet_may_pull(skb))
902 goto tx_err;
903
904 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
905 goto tx_err;
906
907 switch (skb->protocol) {
908 case htons(ETH_P_IP):
909 ret = ip6gre_xmit_ipv4(skb, dev);
910 break;
911 case htons(ETH_P_IPV6):
912 ret = ip6gre_xmit_ipv6(skb, dev);
913 break;
914 default:
915 ret = ip6gre_xmit_other(skb, dev);
916 break;
917 }
918
919 if (ret < 0)
920 goto tx_err;
921
922 return NETDEV_TX_OK;
923
924 tx_err:
925 if (!t->parms.collect_md || !IS_ERR(skb_tunnel_info_txcheck(skb)))
926 stats->tx_errors++;
927 stats->tx_dropped++;
928 kfree_skb(skb);
929 return NETDEV_TX_OK;
930 }
931
ip6erspan_tunnel_xmit(struct sk_buff * skb,struct net_device * dev)932 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
933 struct net_device *dev)
934 {
935 struct ip_tunnel_info *tun_info = NULL;
936 struct ip6_tnl *t = netdev_priv(dev);
937 struct dst_entry *dst = skb_dst(skb);
938 struct net_device_stats *stats;
939 bool truncate = false;
940 int encap_limit = -1;
941 __u8 dsfield = false;
942 struct flowi6 fl6;
943 int err = -EINVAL;
944 __be16 proto;
945 __u32 mtu;
946 int nhoff;
947
948 if (!pskb_inet_may_pull(skb))
949 goto tx_err;
950
951 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
952 goto tx_err;
953
954 if (gre_handle_offloads(skb, false))
955 goto tx_err;
956
957 if (skb->len > dev->mtu + dev->hard_header_len) {
958 pskb_trim(skb, dev->mtu + dev->hard_header_len);
959 truncate = true;
960 }
961
962 nhoff = skb_network_header(skb) - skb_mac_header(skb);
963 if (skb->protocol == htons(ETH_P_IP) &&
964 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
965 truncate = true;
966
967 if (skb->protocol == htons(ETH_P_IPV6)) {
968 int thoff;
969
970 if (skb_transport_header_was_set(skb))
971 thoff = skb_transport_header(skb) - skb_mac_header(skb);
972 else
973 thoff = nhoff + sizeof(struct ipv6hdr);
974 if (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)
975 truncate = true;
976 }
977
978 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
979 goto tx_err;
980
981 t->parms.o_flags &= ~TUNNEL_KEY;
982 IPCB(skb)->flags = 0;
983
984 /* For collect_md mode, derive fl6 from the tunnel key,
985 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
986 */
987 if (t->parms.collect_md) {
988 const struct ip_tunnel_key *key;
989 struct erspan_metadata *md;
990 __be32 tun_id;
991
992 tun_info = skb_tunnel_info_txcheck(skb);
993 if (IS_ERR(tun_info) ||
994 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
995 goto tx_err;
996
997 key = &tun_info->key;
998 memset(&fl6, 0, sizeof(fl6));
999 fl6.flowi6_proto = IPPROTO_GRE;
1000 fl6.daddr = key->u.ipv6.dst;
1001 fl6.flowlabel = key->label;
1002 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1003 fl6.fl6_gre_key = tunnel_id_to_key32(key->tun_id);
1004
1005 dsfield = key->tos;
1006 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
1007 goto tx_err;
1008 if (tun_info->options_len < sizeof(*md))
1009 goto tx_err;
1010 md = ip_tunnel_info_opts(tun_info);
1011
1012 tun_id = tunnel_id_to_key32(key->tun_id);
1013 if (md->version == 1) {
1014 erspan_build_header(skb,
1015 ntohl(tun_id),
1016 ntohl(md->u.index), truncate,
1017 false);
1018 } else if (md->version == 2) {
1019 erspan_build_header_v2(skb,
1020 ntohl(tun_id),
1021 md->u.md2.dir,
1022 get_hwid(&md->u.md2),
1023 truncate, false);
1024 } else {
1025 goto tx_err;
1026 }
1027 } else {
1028 switch (skb->protocol) {
1029 case htons(ETH_P_IP):
1030 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1031 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1032 &dsfield, &encap_limit);
1033 break;
1034 case htons(ETH_P_IPV6):
1035 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1036 goto tx_err;
1037 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1038 &dsfield, &encap_limit))
1039 goto tx_err;
1040 break;
1041 default:
1042 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1043 break;
1044 }
1045
1046 if (t->parms.erspan_ver == 1)
1047 erspan_build_header(skb, ntohl(t->parms.o_key),
1048 t->parms.index,
1049 truncate, false);
1050 else if (t->parms.erspan_ver == 2)
1051 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1052 t->parms.dir,
1053 t->parms.hwid,
1054 truncate, false);
1055 else
1056 goto tx_err;
1057
1058 fl6.daddr = t->parms.raddr;
1059 }
1060
1061 /* Push GRE header. */
1062 proto = (t->parms.erspan_ver == 1) ? htons(ETH_P_ERSPAN)
1063 : htons(ETH_P_ERSPAN2);
1064 gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(atomic_fetch_inc(&t->o_seqno)));
1065
1066 /* TooBig packet may have updated dst->dev's mtu */
1067 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1068 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false);
1069
1070 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1071 NEXTHDR_GRE);
1072 if (err != 0) {
1073 /* XXX: send ICMP error even if DF is not set. */
1074 if (err == -EMSGSIZE) {
1075 if (skb->protocol == htons(ETH_P_IP))
1076 icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1077 ICMP_FRAG_NEEDED, htonl(mtu));
1078 else
1079 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1080 }
1081
1082 goto tx_err;
1083 }
1084 return NETDEV_TX_OK;
1085
1086 tx_err:
1087 stats = &t->dev->stats;
1088 if (!IS_ERR(tun_info))
1089 stats->tx_errors++;
1090 stats->tx_dropped++;
1091 kfree_skb(skb);
1092 return NETDEV_TX_OK;
1093 }
1094
ip6gre_tnl_link_config_common(struct ip6_tnl * t)1095 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1096 {
1097 struct net_device *dev = t->dev;
1098 struct __ip6_tnl_parm *p = &t->parms;
1099 struct flowi6 *fl6 = &t->fl.u.ip6;
1100
1101 if (dev->type != ARPHRD_ETHER) {
1102 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1103 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1104 }
1105
1106 /* Set up flowi template */
1107 fl6->saddr = p->laddr;
1108 fl6->daddr = p->raddr;
1109 fl6->flowi6_oif = p->link;
1110 fl6->flowlabel = 0;
1111 fl6->flowi6_proto = IPPROTO_GRE;
1112 fl6->fl6_gre_key = t->parms.o_key;
1113
1114 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1115 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1116 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1117 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1118
1119 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1120 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1121
1122 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1123 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1124 dev->flags |= IFF_POINTOPOINT;
1125 else
1126 dev->flags &= ~IFF_POINTOPOINT;
1127 }
1128
ip6gre_tnl_link_config_route(struct ip6_tnl * t,int set_mtu,int t_hlen)1129 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1130 int t_hlen)
1131 {
1132 const struct __ip6_tnl_parm *p = &t->parms;
1133 struct net_device *dev = t->dev;
1134
1135 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1136 int strict = (ipv6_addr_type(&p->raddr) &
1137 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1138
1139 struct rt6_info *rt = rt6_lookup(t->net,
1140 &p->raddr, &p->laddr,
1141 p->link, NULL, strict);
1142
1143 if (!rt)
1144 return;
1145
1146 if (rt->dst.dev) {
1147 unsigned short dst_len = rt->dst.dev->hard_header_len +
1148 t_hlen;
1149
1150 if (t->dev->header_ops)
1151 dev->hard_header_len = dst_len;
1152 else
1153 dev->needed_headroom = dst_len;
1154
1155 if (set_mtu) {
1156 int mtu = rt->dst.dev->mtu - t_hlen;
1157
1158 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1159 mtu -= 8;
1160 if (dev->type == ARPHRD_ETHER)
1161 mtu -= ETH_HLEN;
1162
1163 if (mtu < IPV6_MIN_MTU)
1164 mtu = IPV6_MIN_MTU;
1165 WRITE_ONCE(dev->mtu, mtu);
1166 }
1167 }
1168 ip6_rt_put(rt);
1169 }
1170 }
1171
ip6gre_calc_hlen(struct ip6_tnl * tunnel)1172 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1173 {
1174 int t_hlen;
1175
1176 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1177 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1178
1179 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1180
1181 if (tunnel->dev->header_ops)
1182 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1183 else
1184 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1185
1186 return t_hlen;
1187 }
1188
ip6gre_tnl_link_config(struct ip6_tnl * t,int set_mtu)1189 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1190 {
1191 ip6gre_tnl_link_config_common(t);
1192 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1193 }
1194
ip6gre_tnl_copy_tnl_parm(struct ip6_tnl * t,const struct __ip6_tnl_parm * p)1195 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1196 const struct __ip6_tnl_parm *p)
1197 {
1198 t->parms.laddr = p->laddr;
1199 t->parms.raddr = p->raddr;
1200 t->parms.flags = p->flags;
1201 t->parms.hop_limit = p->hop_limit;
1202 t->parms.encap_limit = p->encap_limit;
1203 t->parms.flowinfo = p->flowinfo;
1204 t->parms.link = p->link;
1205 t->parms.proto = p->proto;
1206 t->parms.i_key = p->i_key;
1207 t->parms.o_key = p->o_key;
1208 t->parms.i_flags = p->i_flags;
1209 t->parms.o_flags = p->o_flags;
1210 t->parms.fwmark = p->fwmark;
1211 t->parms.erspan_ver = p->erspan_ver;
1212 t->parms.index = p->index;
1213 t->parms.dir = p->dir;
1214 t->parms.hwid = p->hwid;
1215 dst_cache_reset(&t->dst_cache);
1216 }
1217
ip6gre_tnl_change(struct ip6_tnl * t,const struct __ip6_tnl_parm * p,int set_mtu)1218 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1219 int set_mtu)
1220 {
1221 ip6gre_tnl_copy_tnl_parm(t, p);
1222 ip6gre_tnl_link_config(t, set_mtu);
1223 return 0;
1224 }
1225
ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm * p,const struct ip6_tnl_parm2 * u)1226 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1227 const struct ip6_tnl_parm2 *u)
1228 {
1229 p->laddr = u->laddr;
1230 p->raddr = u->raddr;
1231 p->flags = u->flags;
1232 p->hop_limit = u->hop_limit;
1233 p->encap_limit = u->encap_limit;
1234 p->flowinfo = u->flowinfo;
1235 p->link = u->link;
1236 p->i_key = u->i_key;
1237 p->o_key = u->o_key;
1238 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1239 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1240 memcpy(p->name, u->name, sizeof(u->name));
1241 }
1242
ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 * u,const struct __ip6_tnl_parm * p)1243 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1244 const struct __ip6_tnl_parm *p)
1245 {
1246 u->proto = IPPROTO_GRE;
1247 u->laddr = p->laddr;
1248 u->raddr = p->raddr;
1249 u->flags = p->flags;
1250 u->hop_limit = p->hop_limit;
1251 u->encap_limit = p->encap_limit;
1252 u->flowinfo = p->flowinfo;
1253 u->link = p->link;
1254 u->i_key = p->i_key;
1255 u->o_key = p->o_key;
1256 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1257 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1258 memcpy(u->name, p->name, sizeof(u->name));
1259 }
1260
ip6gre_tunnel_ioctl(struct net_device * dev,struct ifreq * ifr,int cmd)1261 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1262 struct ifreq *ifr, int cmd)
1263 {
1264 int err = 0;
1265 struct ip6_tnl_parm2 p;
1266 struct __ip6_tnl_parm p1;
1267 struct ip6_tnl *t = netdev_priv(dev);
1268 struct net *net = t->net;
1269 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1270
1271 memset(&p1, 0, sizeof(p1));
1272
1273 switch (cmd) {
1274 case SIOCGETTUNNEL:
1275 if (dev == ign->fb_tunnel_dev) {
1276 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1277 err = -EFAULT;
1278 break;
1279 }
1280 ip6gre_tnl_parm_from_user(&p1, &p);
1281 t = ip6gre_tunnel_locate(net, &p1, 0);
1282 if (!t)
1283 t = netdev_priv(dev);
1284 }
1285 memset(&p, 0, sizeof(p));
1286 ip6gre_tnl_parm_to_user(&p, &t->parms);
1287 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1288 err = -EFAULT;
1289 break;
1290
1291 case SIOCADDTUNNEL:
1292 case SIOCCHGTUNNEL:
1293 err = -EPERM;
1294 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1295 goto done;
1296
1297 err = -EFAULT;
1298 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1299 goto done;
1300
1301 err = -EINVAL;
1302 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1303 goto done;
1304
1305 if (!(p.i_flags&GRE_KEY))
1306 p.i_key = 0;
1307 if (!(p.o_flags&GRE_KEY))
1308 p.o_key = 0;
1309
1310 ip6gre_tnl_parm_from_user(&p1, &p);
1311 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1312
1313 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1314 if (t) {
1315 if (t->dev != dev) {
1316 err = -EEXIST;
1317 break;
1318 }
1319 } else {
1320 t = netdev_priv(dev);
1321
1322 ip6gre_tunnel_unlink(ign, t);
1323 synchronize_net();
1324 ip6gre_tnl_change(t, &p1, 1);
1325 ip6gre_tunnel_link(ign, t);
1326 netdev_state_change(dev);
1327 }
1328 }
1329
1330 if (t) {
1331 err = 0;
1332
1333 memset(&p, 0, sizeof(p));
1334 ip6gre_tnl_parm_to_user(&p, &t->parms);
1335 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1336 err = -EFAULT;
1337 } else
1338 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1339 break;
1340
1341 case SIOCDELTUNNEL:
1342 err = -EPERM;
1343 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1344 goto done;
1345
1346 if (dev == ign->fb_tunnel_dev) {
1347 err = -EFAULT;
1348 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1349 goto done;
1350 err = -ENOENT;
1351 ip6gre_tnl_parm_from_user(&p1, &p);
1352 t = ip6gre_tunnel_locate(net, &p1, 0);
1353 if (!t)
1354 goto done;
1355 err = -EPERM;
1356 if (t == netdev_priv(ign->fb_tunnel_dev))
1357 goto done;
1358 dev = t->dev;
1359 }
1360 unregister_netdevice(dev);
1361 err = 0;
1362 break;
1363
1364 default:
1365 err = -EINVAL;
1366 }
1367
1368 done:
1369 return err;
1370 }
1371
ip6gre_header(struct sk_buff * skb,struct net_device * dev,unsigned short type,const void * daddr,const void * saddr,unsigned int len)1372 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1373 unsigned short type, const void *daddr,
1374 const void *saddr, unsigned int len)
1375 {
1376 struct ip6_tnl *t = netdev_priv(dev);
1377 struct ipv6hdr *ipv6h;
1378 __be16 *p;
1379
1380 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1381 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1382 t->fl.u.ip6.flowlabel,
1383 true, &t->fl.u.ip6));
1384 ipv6h->hop_limit = t->parms.hop_limit;
1385 ipv6h->nexthdr = NEXTHDR_GRE;
1386 ipv6h->saddr = t->parms.laddr;
1387 ipv6h->daddr = t->parms.raddr;
1388
1389 p = (__be16 *)(ipv6h + 1);
1390 p[0] = t->parms.o_flags;
1391 p[1] = htons(type);
1392
1393 /*
1394 * Set the source hardware address.
1395 */
1396
1397 if (saddr)
1398 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1399 if (daddr)
1400 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1401 if (!ipv6_addr_any(&ipv6h->daddr))
1402 return t->hlen;
1403
1404 return -t->hlen;
1405 }
1406
1407 static const struct header_ops ip6gre_header_ops = {
1408 .create = ip6gre_header,
1409 };
1410
1411 static const struct net_device_ops ip6gre_netdev_ops = {
1412 .ndo_init = ip6gre_tunnel_init,
1413 .ndo_uninit = ip6gre_tunnel_uninit,
1414 .ndo_start_xmit = ip6gre_tunnel_xmit,
1415 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1416 .ndo_change_mtu = ip6_tnl_change_mtu,
1417 .ndo_get_stats64 = ip_tunnel_get_stats64,
1418 .ndo_get_iflink = ip6_tnl_get_iflink,
1419 };
1420
ip6gre_dev_free(struct net_device * dev)1421 static void ip6gre_dev_free(struct net_device *dev)
1422 {
1423 struct ip6_tnl *t = netdev_priv(dev);
1424
1425 gro_cells_destroy(&t->gro_cells);
1426 dst_cache_destroy(&t->dst_cache);
1427 free_percpu(dev->tstats);
1428 }
1429
ip6gre_tunnel_setup(struct net_device * dev)1430 static void ip6gre_tunnel_setup(struct net_device *dev)
1431 {
1432 dev->netdev_ops = &ip6gre_netdev_ops;
1433 dev->needs_free_netdev = true;
1434 dev->priv_destructor = ip6gre_dev_free;
1435
1436 dev->type = ARPHRD_IP6GRE;
1437
1438 dev->flags |= IFF_NOARP;
1439 dev->addr_len = sizeof(struct in6_addr);
1440 netif_keep_dst(dev);
1441 /* This perm addr will be used as interface identifier by IPv6 */
1442 dev->addr_assign_type = NET_ADDR_RANDOM;
1443 eth_random_addr(dev->perm_addr);
1444 }
1445
1446 #define GRE6_FEATURES (NETIF_F_SG | \
1447 NETIF_F_FRAGLIST | \
1448 NETIF_F_HIGHDMA | \
1449 NETIF_F_HW_CSUM)
1450
ip6gre_tnl_init_features(struct net_device * dev)1451 static void ip6gre_tnl_init_features(struct net_device *dev)
1452 {
1453 struct ip6_tnl *nt = netdev_priv(dev);
1454
1455 dev->features |= GRE6_FEATURES;
1456 dev->hw_features |= GRE6_FEATURES;
1457
1458 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1459 /* TCP offload with GRE SEQ is not supported, nor
1460 * can we support 2 levels of outer headers requiring
1461 * an update.
1462 */
1463 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1464 nt->encap.type == TUNNEL_ENCAP_NONE) {
1465 dev->features |= NETIF_F_GSO_SOFTWARE;
1466 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1467 }
1468
1469 /* Can use a lockless transmit, unless we generate
1470 * output sequences
1471 */
1472 dev->features |= NETIF_F_LLTX;
1473 }
1474 }
1475
ip6gre_tunnel_init_common(struct net_device * dev)1476 static int ip6gre_tunnel_init_common(struct net_device *dev)
1477 {
1478 struct ip6_tnl *tunnel;
1479 int ret;
1480 int t_hlen;
1481
1482 tunnel = netdev_priv(dev);
1483
1484 tunnel->dev = dev;
1485 tunnel->net = dev_net(dev);
1486 strcpy(tunnel->parms.name, dev->name);
1487
1488 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1489 if (!dev->tstats)
1490 return -ENOMEM;
1491
1492 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1493 if (ret)
1494 goto cleanup_alloc_pcpu_stats;
1495
1496 ret = gro_cells_init(&tunnel->gro_cells, dev);
1497 if (ret)
1498 goto cleanup_dst_cache_init;
1499
1500 t_hlen = ip6gre_calc_hlen(tunnel);
1501 dev->mtu = ETH_DATA_LEN - t_hlen;
1502 if (dev->type == ARPHRD_ETHER)
1503 dev->mtu -= ETH_HLEN;
1504 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1505 dev->mtu -= 8;
1506
1507 if (tunnel->parms.collect_md) {
1508 netif_keep_dst(dev);
1509 }
1510 ip6gre_tnl_init_features(dev);
1511
1512 dev_hold(dev);
1513 return 0;
1514
1515 cleanup_dst_cache_init:
1516 dst_cache_destroy(&tunnel->dst_cache);
1517 cleanup_alloc_pcpu_stats:
1518 free_percpu(dev->tstats);
1519 dev->tstats = NULL;
1520 return ret;
1521 }
1522
ip6gre_tunnel_init(struct net_device * dev)1523 static int ip6gre_tunnel_init(struct net_device *dev)
1524 {
1525 struct ip6_tnl *tunnel;
1526 int ret;
1527
1528 ret = ip6gre_tunnel_init_common(dev);
1529 if (ret)
1530 return ret;
1531
1532 tunnel = netdev_priv(dev);
1533
1534 if (tunnel->parms.collect_md)
1535 return 0;
1536
1537 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1538 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1539
1540 if (ipv6_addr_any(&tunnel->parms.raddr))
1541 dev->header_ops = &ip6gre_header_ops;
1542
1543 return 0;
1544 }
1545
ip6gre_fb_tunnel_init(struct net_device * dev)1546 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1547 {
1548 struct ip6_tnl *tunnel = netdev_priv(dev);
1549
1550 tunnel->dev = dev;
1551 tunnel->net = dev_net(dev);
1552 strcpy(tunnel->parms.name, dev->name);
1553
1554 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1555 }
1556
1557 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1558 .handler = gre_rcv,
1559 .err_handler = ip6gre_err,
1560 .flags = INET6_PROTO_FINAL,
1561 };
1562
ip6gre_destroy_tunnels(struct net * net,struct list_head * head)1563 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1564 {
1565 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1566 struct net_device *dev, *aux;
1567 int prio;
1568
1569 for_each_netdev_safe(net, dev, aux)
1570 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1571 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1572 dev->rtnl_link_ops == &ip6erspan_tap_ops)
1573 unregister_netdevice_queue(dev, head);
1574
1575 for (prio = 0; prio < 4; prio++) {
1576 int h;
1577 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1578 struct ip6_tnl *t;
1579
1580 t = rtnl_dereference(ign->tunnels[prio][h]);
1581
1582 while (t) {
1583 /* If dev is in the same netns, it has already
1584 * been added to the list by the previous loop.
1585 */
1586 if (!net_eq(dev_net(t->dev), net))
1587 unregister_netdevice_queue(t->dev,
1588 head);
1589 t = rtnl_dereference(t->next);
1590 }
1591 }
1592 }
1593 }
1594
ip6gre_init_net(struct net * net)1595 static int __net_init ip6gre_init_net(struct net *net)
1596 {
1597 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1598 struct net_device *ndev;
1599 int err;
1600
1601 if (!net_has_fallback_tunnels(net))
1602 return 0;
1603 ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1604 NET_NAME_UNKNOWN, ip6gre_tunnel_setup);
1605 if (!ndev) {
1606 err = -ENOMEM;
1607 goto err_alloc_dev;
1608 }
1609 ign->fb_tunnel_dev = ndev;
1610 dev_net_set(ign->fb_tunnel_dev, net);
1611 /* FB netdevice is special: we have one, and only one per netns.
1612 * Allowing to move it to another netns is clearly unsafe.
1613 */
1614 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1615
1616
1617 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1618 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1619
1620 err = register_netdev(ign->fb_tunnel_dev);
1621 if (err)
1622 goto err_reg_dev;
1623
1624 rcu_assign_pointer(ign->tunnels_wc[0],
1625 netdev_priv(ign->fb_tunnel_dev));
1626 return 0;
1627
1628 err_reg_dev:
1629 free_netdev(ndev);
1630 err_alloc_dev:
1631 return err;
1632 }
1633
ip6gre_exit_batch_net(struct list_head * net_list)1634 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1635 {
1636 struct net *net;
1637 LIST_HEAD(list);
1638
1639 rtnl_lock();
1640 list_for_each_entry(net, net_list, exit_list)
1641 ip6gre_destroy_tunnels(net, &list);
1642 unregister_netdevice_many(&list);
1643 rtnl_unlock();
1644 }
1645
1646 static struct pernet_operations ip6gre_net_ops = {
1647 .init = ip6gre_init_net,
1648 .exit_batch = ip6gre_exit_batch_net,
1649 .id = &ip6gre_net_id,
1650 .size = sizeof(struct ip6gre_net),
1651 };
1652
ip6gre_tunnel_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1653 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1654 struct netlink_ext_ack *extack)
1655 {
1656 __be16 flags;
1657
1658 if (!data)
1659 return 0;
1660
1661 flags = 0;
1662 if (data[IFLA_GRE_IFLAGS])
1663 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1664 if (data[IFLA_GRE_OFLAGS])
1665 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1666 if (flags & (GRE_VERSION|GRE_ROUTING))
1667 return -EINVAL;
1668
1669 return 0;
1670 }
1671
ip6gre_tap_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1672 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1673 struct netlink_ext_ack *extack)
1674 {
1675 struct in6_addr daddr;
1676
1677 if (tb[IFLA_ADDRESS]) {
1678 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1679 return -EINVAL;
1680 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1681 return -EADDRNOTAVAIL;
1682 }
1683
1684 if (!data)
1685 goto out;
1686
1687 if (data[IFLA_GRE_REMOTE]) {
1688 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1689 if (ipv6_addr_any(&daddr))
1690 return -EINVAL;
1691 }
1692
1693 out:
1694 return ip6gre_tunnel_validate(tb, data, extack);
1695 }
1696
ip6erspan_tap_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1697 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1698 struct netlink_ext_ack *extack)
1699 {
1700 __be16 flags = 0;
1701 int ret, ver = 0;
1702
1703 if (!data)
1704 return 0;
1705
1706 ret = ip6gre_tap_validate(tb, data, extack);
1707 if (ret)
1708 return ret;
1709
1710 /* ERSPAN should only have GRE sequence and key flag */
1711 if (data[IFLA_GRE_OFLAGS])
1712 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1713 if (data[IFLA_GRE_IFLAGS])
1714 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1715 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1716 flags != (GRE_SEQ | GRE_KEY))
1717 return -EINVAL;
1718
1719 /* ERSPAN Session ID only has 10-bit. Since we reuse
1720 * 32-bit key field as ID, check it's range.
1721 */
1722 if (data[IFLA_GRE_IKEY] &&
1723 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1724 return -EINVAL;
1725
1726 if (data[IFLA_GRE_OKEY] &&
1727 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1728 return -EINVAL;
1729
1730 if (data[IFLA_GRE_ERSPAN_VER]) {
1731 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1732 if (ver != 1 && ver != 2)
1733 return -EINVAL;
1734 }
1735
1736 if (ver == 1) {
1737 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1738 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1739
1740 if (index & ~INDEX_MASK)
1741 return -EINVAL;
1742 }
1743 } else if (ver == 2) {
1744 if (data[IFLA_GRE_ERSPAN_DIR]) {
1745 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1746
1747 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1748 return -EINVAL;
1749 }
1750
1751 if (data[IFLA_GRE_ERSPAN_HWID]) {
1752 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1753
1754 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1755 return -EINVAL;
1756 }
1757 }
1758
1759 return 0;
1760 }
1761
ip6erspan_set_version(struct nlattr * data[],struct __ip6_tnl_parm * parms)1762 static void ip6erspan_set_version(struct nlattr *data[],
1763 struct __ip6_tnl_parm *parms)
1764 {
1765 if (!data)
1766 return;
1767
1768 parms->erspan_ver = 1;
1769 if (data[IFLA_GRE_ERSPAN_VER])
1770 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1771
1772 if (parms->erspan_ver == 1) {
1773 if (data[IFLA_GRE_ERSPAN_INDEX])
1774 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1775 } else if (parms->erspan_ver == 2) {
1776 if (data[IFLA_GRE_ERSPAN_DIR])
1777 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1778 if (data[IFLA_GRE_ERSPAN_HWID])
1779 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1780 }
1781 }
1782
ip6gre_netlink_parms(struct nlattr * data[],struct __ip6_tnl_parm * parms)1783 static void ip6gre_netlink_parms(struct nlattr *data[],
1784 struct __ip6_tnl_parm *parms)
1785 {
1786 memset(parms, 0, sizeof(*parms));
1787
1788 if (!data)
1789 return;
1790
1791 if (data[IFLA_GRE_LINK])
1792 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1793
1794 if (data[IFLA_GRE_IFLAGS])
1795 parms->i_flags = gre_flags_to_tnl_flags(
1796 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1797
1798 if (data[IFLA_GRE_OFLAGS])
1799 parms->o_flags = gre_flags_to_tnl_flags(
1800 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1801
1802 if (data[IFLA_GRE_IKEY])
1803 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1804
1805 if (data[IFLA_GRE_OKEY])
1806 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1807
1808 if (data[IFLA_GRE_LOCAL])
1809 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1810
1811 if (data[IFLA_GRE_REMOTE])
1812 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1813
1814 if (data[IFLA_GRE_TTL])
1815 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1816
1817 if (data[IFLA_GRE_ENCAP_LIMIT])
1818 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1819
1820 if (data[IFLA_GRE_FLOWINFO])
1821 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1822
1823 if (data[IFLA_GRE_FLAGS])
1824 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1825
1826 if (data[IFLA_GRE_FWMARK])
1827 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1828
1829 if (data[IFLA_GRE_COLLECT_METADATA])
1830 parms->collect_md = true;
1831 }
1832
ip6gre_tap_init(struct net_device * dev)1833 static int ip6gre_tap_init(struct net_device *dev)
1834 {
1835 int ret;
1836
1837 ret = ip6gre_tunnel_init_common(dev);
1838 if (ret)
1839 return ret;
1840
1841 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1842
1843 return 0;
1844 }
1845
1846 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1847 .ndo_init = ip6gre_tap_init,
1848 .ndo_uninit = ip6gre_tunnel_uninit,
1849 .ndo_start_xmit = ip6gre_tunnel_xmit,
1850 .ndo_set_mac_address = eth_mac_addr,
1851 .ndo_validate_addr = eth_validate_addr,
1852 .ndo_change_mtu = ip6_tnl_change_mtu,
1853 .ndo_get_stats64 = ip_tunnel_get_stats64,
1854 .ndo_get_iflink = ip6_tnl_get_iflink,
1855 };
1856
ip6erspan_calc_hlen(struct ip6_tnl * tunnel)1857 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1858 {
1859 int t_hlen;
1860
1861 tunnel->tun_hlen = 8;
1862 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1863 erspan_hdr_len(tunnel->parms.erspan_ver);
1864
1865 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1866 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1867 return t_hlen;
1868 }
1869
ip6erspan_tap_init(struct net_device * dev)1870 static int ip6erspan_tap_init(struct net_device *dev)
1871 {
1872 struct ip6_tnl *tunnel;
1873 int t_hlen;
1874 int ret;
1875
1876 tunnel = netdev_priv(dev);
1877
1878 tunnel->dev = dev;
1879 tunnel->net = dev_net(dev);
1880 strcpy(tunnel->parms.name, dev->name);
1881
1882 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1883 if (!dev->tstats)
1884 return -ENOMEM;
1885
1886 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1887 if (ret)
1888 goto cleanup_alloc_pcpu_stats;
1889
1890 ret = gro_cells_init(&tunnel->gro_cells, dev);
1891 if (ret)
1892 goto cleanup_dst_cache_init;
1893
1894 t_hlen = ip6erspan_calc_hlen(tunnel);
1895 dev->mtu = ETH_DATA_LEN - t_hlen;
1896 if (dev->type == ARPHRD_ETHER)
1897 dev->mtu -= ETH_HLEN;
1898 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1899 dev->mtu -= 8;
1900
1901 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1902 ip6erspan_tnl_link_config(tunnel, 1);
1903
1904 dev_hold(dev);
1905 return 0;
1906
1907 cleanup_dst_cache_init:
1908 dst_cache_destroy(&tunnel->dst_cache);
1909 cleanup_alloc_pcpu_stats:
1910 free_percpu(dev->tstats);
1911 dev->tstats = NULL;
1912 return ret;
1913 }
1914
1915 static const struct net_device_ops ip6erspan_netdev_ops = {
1916 .ndo_init = ip6erspan_tap_init,
1917 .ndo_uninit = ip6erspan_tunnel_uninit,
1918 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1919 .ndo_set_mac_address = eth_mac_addr,
1920 .ndo_validate_addr = eth_validate_addr,
1921 .ndo_change_mtu = ip6_tnl_change_mtu,
1922 .ndo_get_stats64 = ip_tunnel_get_stats64,
1923 .ndo_get_iflink = ip6_tnl_get_iflink,
1924 };
1925
ip6gre_tap_setup(struct net_device * dev)1926 static void ip6gre_tap_setup(struct net_device *dev)
1927 {
1928
1929 ether_setup(dev);
1930
1931 dev->max_mtu = 0;
1932 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1933 dev->needs_free_netdev = true;
1934 dev->priv_destructor = ip6gre_dev_free;
1935
1936 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1937 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1938 netif_keep_dst(dev);
1939 }
1940
ip6gre_netlink_encap_parms(struct nlattr * data[],struct ip_tunnel_encap * ipencap)1941 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1942 struct ip_tunnel_encap *ipencap)
1943 {
1944 bool ret = false;
1945
1946 memset(ipencap, 0, sizeof(*ipencap));
1947
1948 if (!data)
1949 return ret;
1950
1951 if (data[IFLA_GRE_ENCAP_TYPE]) {
1952 ret = true;
1953 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1954 }
1955
1956 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1957 ret = true;
1958 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1959 }
1960
1961 if (data[IFLA_GRE_ENCAP_SPORT]) {
1962 ret = true;
1963 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1964 }
1965
1966 if (data[IFLA_GRE_ENCAP_DPORT]) {
1967 ret = true;
1968 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1969 }
1970
1971 return ret;
1972 }
1973
ip6gre_newlink_common(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1974 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1975 struct nlattr *tb[], struct nlattr *data[],
1976 struct netlink_ext_ack *extack)
1977 {
1978 struct ip6_tnl *nt;
1979 struct ip_tunnel_encap ipencap;
1980 int err;
1981
1982 nt = netdev_priv(dev);
1983
1984 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1985 int err = ip6_tnl_encap_setup(nt, &ipencap);
1986
1987 if (err < 0)
1988 return err;
1989 }
1990
1991 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1992 eth_hw_addr_random(dev);
1993
1994 nt->dev = dev;
1995 nt->net = dev_net(dev);
1996
1997 err = register_netdevice(dev);
1998 if (err)
1999 goto out;
2000
2001 if (tb[IFLA_MTU])
2002 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2003
2004 out:
2005 return err;
2006 }
2007
ip6gre_newlink(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2008 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
2009 struct nlattr *tb[], struct nlattr *data[],
2010 struct netlink_ext_ack *extack)
2011 {
2012 struct ip6_tnl *nt = netdev_priv(dev);
2013 struct net *net = dev_net(dev);
2014 struct ip6gre_net *ign;
2015 int err;
2016
2017 ip6gre_netlink_parms(data, &nt->parms);
2018 ign = net_generic(net, ip6gre_net_id);
2019
2020 if (nt->parms.collect_md) {
2021 if (rtnl_dereference(ign->collect_md_tun))
2022 return -EEXIST;
2023 } else {
2024 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2025 return -EEXIST;
2026 }
2027
2028 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2029 if (!err) {
2030 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
2031 ip6gre_tunnel_link_md(ign, nt);
2032 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2033 }
2034 return err;
2035 }
2036
2037 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)2038 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2039 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2040 struct netlink_ext_ack *extack)
2041 {
2042 struct ip6_tnl *t, *nt = netdev_priv(dev);
2043 struct net *net = nt->net;
2044 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2045 struct ip_tunnel_encap ipencap;
2046
2047 if (dev == ign->fb_tunnel_dev)
2048 return ERR_PTR(-EINVAL);
2049
2050 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2051 int err = ip6_tnl_encap_setup(nt, &ipencap);
2052
2053 if (err < 0)
2054 return ERR_PTR(err);
2055 }
2056
2057 ip6gre_netlink_parms(data, p_p);
2058
2059 t = ip6gre_tunnel_locate(net, p_p, 0);
2060
2061 if (t) {
2062 if (t->dev != dev)
2063 return ERR_PTR(-EEXIST);
2064 } else {
2065 t = nt;
2066 }
2067
2068 return t;
2069 }
2070
ip6gre_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2071 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2072 struct nlattr *data[],
2073 struct netlink_ext_ack *extack)
2074 {
2075 struct ip6_tnl *t = netdev_priv(dev);
2076 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2077 struct __ip6_tnl_parm p;
2078
2079 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2080 if (IS_ERR(t))
2081 return PTR_ERR(t);
2082
2083 ip6gre_tunnel_unlink_md(ign, t);
2084 ip6gre_tunnel_unlink(ign, t);
2085 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2086 ip6gre_tunnel_link_md(ign, t);
2087 ip6gre_tunnel_link(ign, t);
2088 return 0;
2089 }
2090
ip6gre_dellink(struct net_device * dev,struct list_head * head)2091 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2092 {
2093 struct net *net = dev_net(dev);
2094 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2095
2096 if (dev != ign->fb_tunnel_dev)
2097 unregister_netdevice_queue(dev, head);
2098 }
2099
ip6gre_get_size(const struct net_device * dev)2100 static size_t ip6gre_get_size(const struct net_device *dev)
2101 {
2102 return
2103 /* IFLA_GRE_LINK */
2104 nla_total_size(4) +
2105 /* IFLA_GRE_IFLAGS */
2106 nla_total_size(2) +
2107 /* IFLA_GRE_OFLAGS */
2108 nla_total_size(2) +
2109 /* IFLA_GRE_IKEY */
2110 nla_total_size(4) +
2111 /* IFLA_GRE_OKEY */
2112 nla_total_size(4) +
2113 /* IFLA_GRE_LOCAL */
2114 nla_total_size(sizeof(struct in6_addr)) +
2115 /* IFLA_GRE_REMOTE */
2116 nla_total_size(sizeof(struct in6_addr)) +
2117 /* IFLA_GRE_TTL */
2118 nla_total_size(1) +
2119 /* IFLA_GRE_ENCAP_LIMIT */
2120 nla_total_size(1) +
2121 /* IFLA_GRE_FLOWINFO */
2122 nla_total_size(4) +
2123 /* IFLA_GRE_FLAGS */
2124 nla_total_size(4) +
2125 /* IFLA_GRE_ENCAP_TYPE */
2126 nla_total_size(2) +
2127 /* IFLA_GRE_ENCAP_FLAGS */
2128 nla_total_size(2) +
2129 /* IFLA_GRE_ENCAP_SPORT */
2130 nla_total_size(2) +
2131 /* IFLA_GRE_ENCAP_DPORT */
2132 nla_total_size(2) +
2133 /* IFLA_GRE_COLLECT_METADATA */
2134 nla_total_size(0) +
2135 /* IFLA_GRE_FWMARK */
2136 nla_total_size(4) +
2137 /* IFLA_GRE_ERSPAN_INDEX */
2138 nla_total_size(4) +
2139 0;
2140 }
2141
ip6gre_fill_info(struct sk_buff * skb,const struct net_device * dev)2142 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2143 {
2144 struct ip6_tnl *t = netdev_priv(dev);
2145 struct __ip6_tnl_parm *p = &t->parms;
2146 __be16 o_flags = p->o_flags;
2147
2148 if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2149 if (!p->collect_md)
2150 o_flags |= TUNNEL_KEY;
2151
2152 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2153 goto nla_put_failure;
2154
2155 if (p->erspan_ver == 1) {
2156 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2157 goto nla_put_failure;
2158 } else {
2159 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2160 goto nla_put_failure;
2161 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2162 goto nla_put_failure;
2163 }
2164 }
2165
2166 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2167 nla_put_be16(skb, IFLA_GRE_IFLAGS,
2168 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2169 nla_put_be16(skb, IFLA_GRE_OFLAGS,
2170 gre_tnl_flags_to_gre_flags(o_flags)) ||
2171 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2172 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2173 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2174 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2175 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2176 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2177 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2178 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2179 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
2180 goto nla_put_failure;
2181
2182 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2183 t->encap.type) ||
2184 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2185 t->encap.sport) ||
2186 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2187 t->encap.dport) ||
2188 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2189 t->encap.flags))
2190 goto nla_put_failure;
2191
2192 if (p->collect_md) {
2193 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2194 goto nla_put_failure;
2195 }
2196
2197 return 0;
2198
2199 nla_put_failure:
2200 return -EMSGSIZE;
2201 }
2202
2203 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2204 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2205 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2206 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2207 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2208 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2209 [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct ipv6hdr, saddr) },
2210 [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct ipv6hdr, daddr) },
2211 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2212 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2213 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2214 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
2215 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2216 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2217 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2218 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
2219 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2220 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
2221 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2222 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2223 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2224 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
2225 };
2226
ip6erspan_tap_setup(struct net_device * dev)2227 static void ip6erspan_tap_setup(struct net_device *dev)
2228 {
2229 ether_setup(dev);
2230
2231 dev->max_mtu = 0;
2232 dev->netdev_ops = &ip6erspan_netdev_ops;
2233 dev->needs_free_netdev = true;
2234 dev->priv_destructor = ip6gre_dev_free;
2235
2236 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2237 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2238 netif_keep_dst(dev);
2239 }
2240
ip6erspan_newlink(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2241 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2242 struct nlattr *tb[], struct nlattr *data[],
2243 struct netlink_ext_ack *extack)
2244 {
2245 struct ip6_tnl *nt = netdev_priv(dev);
2246 struct net *net = dev_net(dev);
2247 struct ip6gre_net *ign;
2248 int err;
2249
2250 ip6gre_netlink_parms(data, &nt->parms);
2251 ip6erspan_set_version(data, &nt->parms);
2252 ign = net_generic(net, ip6gre_net_id);
2253
2254 if (nt->parms.collect_md) {
2255 if (rtnl_dereference(ign->collect_md_tun_erspan))
2256 return -EEXIST;
2257 } else {
2258 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2259 return -EEXIST;
2260 }
2261
2262 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2263 if (!err) {
2264 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2265 ip6erspan_tunnel_link_md(ign, nt);
2266 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2267 }
2268 return err;
2269 }
2270
ip6erspan_tnl_link_config(struct ip6_tnl * t,int set_mtu)2271 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2272 {
2273 ip6gre_tnl_link_config_common(t);
2274 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2275 }
2276
ip6erspan_tnl_change(struct ip6_tnl * t,const struct __ip6_tnl_parm * p,int set_mtu)2277 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2278 const struct __ip6_tnl_parm *p, int set_mtu)
2279 {
2280 ip6gre_tnl_copy_tnl_parm(t, p);
2281 ip6erspan_tnl_link_config(t, set_mtu);
2282 return 0;
2283 }
2284
ip6erspan_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2285 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2286 struct nlattr *data[],
2287 struct netlink_ext_ack *extack)
2288 {
2289 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2290 struct __ip6_tnl_parm p;
2291 struct ip6_tnl *t;
2292
2293 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2294 if (IS_ERR(t))
2295 return PTR_ERR(t);
2296
2297 ip6erspan_set_version(data, &p);
2298 ip6gre_tunnel_unlink_md(ign, t);
2299 ip6gre_tunnel_unlink(ign, t);
2300 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2301 ip6erspan_tunnel_link_md(ign, t);
2302 ip6gre_tunnel_link(ign, t);
2303 return 0;
2304 }
2305
2306 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2307 .kind = "ip6gre",
2308 .maxtype = IFLA_GRE_MAX,
2309 .policy = ip6gre_policy,
2310 .priv_size = sizeof(struct ip6_tnl),
2311 .setup = ip6gre_tunnel_setup,
2312 .validate = ip6gre_tunnel_validate,
2313 .newlink = ip6gre_newlink,
2314 .changelink = ip6gre_changelink,
2315 .dellink = ip6gre_dellink,
2316 .get_size = ip6gre_get_size,
2317 .fill_info = ip6gre_fill_info,
2318 .get_link_net = ip6_tnl_get_link_net,
2319 };
2320
2321 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2322 .kind = "ip6gretap",
2323 .maxtype = IFLA_GRE_MAX,
2324 .policy = ip6gre_policy,
2325 .priv_size = sizeof(struct ip6_tnl),
2326 .setup = ip6gre_tap_setup,
2327 .validate = ip6gre_tap_validate,
2328 .newlink = ip6gre_newlink,
2329 .changelink = ip6gre_changelink,
2330 .get_size = ip6gre_get_size,
2331 .fill_info = ip6gre_fill_info,
2332 .get_link_net = ip6_tnl_get_link_net,
2333 };
2334
2335 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2336 .kind = "ip6erspan",
2337 .maxtype = IFLA_GRE_MAX,
2338 .policy = ip6gre_policy,
2339 .priv_size = sizeof(struct ip6_tnl),
2340 .setup = ip6erspan_tap_setup,
2341 .validate = ip6erspan_tap_validate,
2342 .newlink = ip6erspan_newlink,
2343 .changelink = ip6erspan_changelink,
2344 .get_size = ip6gre_get_size,
2345 .fill_info = ip6gre_fill_info,
2346 .get_link_net = ip6_tnl_get_link_net,
2347 };
2348
2349 /*
2350 * And now the modules code and kernel interface.
2351 */
2352
ip6gre_init(void)2353 static int __init ip6gre_init(void)
2354 {
2355 int err;
2356
2357 pr_info("GRE over IPv6 tunneling driver\n");
2358
2359 err = register_pernet_device(&ip6gre_net_ops);
2360 if (err < 0)
2361 return err;
2362
2363 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2364 if (err < 0) {
2365 pr_info("%s: can't add protocol\n", __func__);
2366 goto add_proto_failed;
2367 }
2368
2369 err = rtnl_link_register(&ip6gre_link_ops);
2370 if (err < 0)
2371 goto rtnl_link_failed;
2372
2373 err = rtnl_link_register(&ip6gre_tap_ops);
2374 if (err < 0)
2375 goto tap_ops_failed;
2376
2377 err = rtnl_link_register(&ip6erspan_tap_ops);
2378 if (err < 0)
2379 goto erspan_link_failed;
2380
2381 out:
2382 return err;
2383
2384 erspan_link_failed:
2385 rtnl_link_unregister(&ip6gre_tap_ops);
2386 tap_ops_failed:
2387 rtnl_link_unregister(&ip6gre_link_ops);
2388 rtnl_link_failed:
2389 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2390 add_proto_failed:
2391 unregister_pernet_device(&ip6gre_net_ops);
2392 goto out;
2393 }
2394
ip6gre_fini(void)2395 static void __exit ip6gre_fini(void)
2396 {
2397 rtnl_link_unregister(&ip6gre_tap_ops);
2398 rtnl_link_unregister(&ip6gre_link_ops);
2399 rtnl_link_unregister(&ip6erspan_tap_ops);
2400 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2401 unregister_pernet_device(&ip6gre_net_ops);
2402 }
2403
2404 module_init(ip6gre_init);
2405 module_exit(ip6gre_fini);
2406 MODULE_LICENSE("GPL");
2407 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2408 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2409 MODULE_ALIAS_RTNL_LINK("ip6gre");
2410 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2411 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2412 MODULE_ALIAS_NETDEV("ip6gre0");
2413