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 if (pskb_trim(skb, dev->mtu + dev->hard_header_len))
959 goto tx_err;
960 truncate = true;
961 }
962
963 nhoff = skb_network_offset(skb);
964 if (skb->protocol == htons(ETH_P_IP) &&
965 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
966 truncate = true;
967
968 if (skb->protocol == htons(ETH_P_IPV6)) {
969 int thoff;
970
971 if (skb_transport_header_was_set(skb))
972 thoff = skb_transport_offset(skb);
973 else
974 thoff = nhoff + sizeof(struct ipv6hdr);
975 if (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)
976 truncate = true;
977 }
978
979 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
980 goto tx_err;
981
982 t->parms.o_flags &= ~TUNNEL_KEY;
983 IPCB(skb)->flags = 0;
984
985 /* For collect_md mode, derive fl6 from the tunnel key,
986 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
987 */
988 if (t->parms.collect_md) {
989 const struct ip_tunnel_key *key;
990 struct erspan_metadata *md;
991 __be32 tun_id;
992
993 tun_info = skb_tunnel_info_txcheck(skb);
994 if (IS_ERR(tun_info) ||
995 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
996 goto tx_err;
997
998 key = &tun_info->key;
999 memset(&fl6, 0, sizeof(fl6));
1000 fl6.flowi6_proto = IPPROTO_GRE;
1001 fl6.daddr = key->u.ipv6.dst;
1002 fl6.flowlabel = key->label;
1003 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1004 fl6.fl6_gre_key = tunnel_id_to_key32(key->tun_id);
1005
1006 dsfield = key->tos;
1007 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
1008 goto tx_err;
1009 if (tun_info->options_len < sizeof(*md))
1010 goto tx_err;
1011 md = ip_tunnel_info_opts(tun_info);
1012
1013 tun_id = tunnel_id_to_key32(key->tun_id);
1014 if (md->version == 1) {
1015 erspan_build_header(skb,
1016 ntohl(tun_id),
1017 ntohl(md->u.index), truncate,
1018 false);
1019 proto = htons(ETH_P_ERSPAN);
1020 } else if (md->version == 2) {
1021 erspan_build_header_v2(skb,
1022 ntohl(tun_id),
1023 md->u.md2.dir,
1024 get_hwid(&md->u.md2),
1025 truncate, false);
1026 proto = htons(ETH_P_ERSPAN2);
1027 } else {
1028 goto tx_err;
1029 }
1030 } else {
1031 switch (skb->protocol) {
1032 case htons(ETH_P_IP):
1033 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1034 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1035 &dsfield, &encap_limit);
1036 break;
1037 case htons(ETH_P_IPV6):
1038 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1039 goto tx_err;
1040 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1041 &dsfield, &encap_limit))
1042 goto tx_err;
1043 break;
1044 default:
1045 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1046 break;
1047 }
1048
1049 if (t->parms.erspan_ver == 1) {
1050 erspan_build_header(skb, ntohl(t->parms.o_key),
1051 t->parms.index,
1052 truncate, false);
1053 proto = htons(ETH_P_ERSPAN);
1054 } else if (t->parms.erspan_ver == 2) {
1055 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1056 t->parms.dir,
1057 t->parms.hwid,
1058 truncate, false);
1059 proto = htons(ETH_P_ERSPAN2);
1060 } else {
1061 goto tx_err;
1062 }
1063
1064 fl6.daddr = t->parms.raddr;
1065 }
1066
1067 /* Push GRE header. */
1068 gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(atomic_fetch_inc(&t->o_seqno)));
1069
1070 /* TooBig packet may have updated dst->dev's mtu */
1071 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1072 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false);
1073
1074 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1075 NEXTHDR_GRE);
1076 if (err != 0) {
1077 /* XXX: send ICMP error even if DF is not set. */
1078 if (err == -EMSGSIZE) {
1079 if (skb->protocol == htons(ETH_P_IP))
1080 icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1081 ICMP_FRAG_NEEDED, htonl(mtu));
1082 else
1083 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1084 }
1085
1086 goto tx_err;
1087 }
1088 return NETDEV_TX_OK;
1089
1090 tx_err:
1091 stats = &t->dev->stats;
1092 if (!IS_ERR(tun_info))
1093 stats->tx_errors++;
1094 stats->tx_dropped++;
1095 kfree_skb(skb);
1096 return NETDEV_TX_OK;
1097 }
1098
ip6gre_tnl_link_config_common(struct ip6_tnl * t)1099 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1100 {
1101 struct net_device *dev = t->dev;
1102 struct __ip6_tnl_parm *p = &t->parms;
1103 struct flowi6 *fl6 = &t->fl.u.ip6;
1104
1105 if (dev->type != ARPHRD_ETHER) {
1106 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1107 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1108 }
1109
1110 /* Set up flowi template */
1111 fl6->saddr = p->laddr;
1112 fl6->daddr = p->raddr;
1113 fl6->flowi6_oif = p->link;
1114 fl6->flowlabel = 0;
1115 fl6->flowi6_proto = IPPROTO_GRE;
1116 fl6->fl6_gre_key = t->parms.o_key;
1117
1118 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1119 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1120 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1121 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1122
1123 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1124 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1125
1126 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1127 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1128 dev->flags |= IFF_POINTOPOINT;
1129 else
1130 dev->flags &= ~IFF_POINTOPOINT;
1131 }
1132
ip6gre_tnl_link_config_route(struct ip6_tnl * t,int set_mtu,int t_hlen)1133 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1134 int t_hlen)
1135 {
1136 const struct __ip6_tnl_parm *p = &t->parms;
1137 struct net_device *dev = t->dev;
1138
1139 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1140 int strict = (ipv6_addr_type(&p->raddr) &
1141 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1142
1143 struct rt6_info *rt = rt6_lookup(t->net,
1144 &p->raddr, &p->laddr,
1145 p->link, NULL, strict);
1146
1147 if (!rt)
1148 return;
1149
1150 if (rt->dst.dev) {
1151 unsigned short dst_len = rt->dst.dev->hard_header_len +
1152 t_hlen;
1153
1154 if (t->dev->header_ops)
1155 dev->hard_header_len = dst_len;
1156 else
1157 dev->needed_headroom = dst_len;
1158
1159 if (set_mtu) {
1160 int mtu = rt->dst.dev->mtu - t_hlen;
1161
1162 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1163 mtu -= 8;
1164 if (dev->type == ARPHRD_ETHER)
1165 mtu -= ETH_HLEN;
1166
1167 if (mtu < IPV6_MIN_MTU)
1168 mtu = IPV6_MIN_MTU;
1169 WRITE_ONCE(dev->mtu, mtu);
1170 }
1171 }
1172 ip6_rt_put(rt);
1173 }
1174 }
1175
ip6gre_calc_hlen(struct ip6_tnl * tunnel)1176 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1177 {
1178 int t_hlen;
1179
1180 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1181 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1182
1183 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1184
1185 if (tunnel->dev->header_ops)
1186 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1187 else
1188 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1189
1190 return t_hlen;
1191 }
1192
ip6gre_tnl_link_config(struct ip6_tnl * t,int set_mtu)1193 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1194 {
1195 ip6gre_tnl_link_config_common(t);
1196 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1197 }
1198
ip6gre_tnl_copy_tnl_parm(struct ip6_tnl * t,const struct __ip6_tnl_parm * p)1199 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1200 const struct __ip6_tnl_parm *p)
1201 {
1202 t->parms.laddr = p->laddr;
1203 t->parms.raddr = p->raddr;
1204 t->parms.flags = p->flags;
1205 t->parms.hop_limit = p->hop_limit;
1206 t->parms.encap_limit = p->encap_limit;
1207 t->parms.flowinfo = p->flowinfo;
1208 t->parms.link = p->link;
1209 t->parms.proto = p->proto;
1210 t->parms.i_key = p->i_key;
1211 t->parms.o_key = p->o_key;
1212 t->parms.i_flags = p->i_flags;
1213 t->parms.o_flags = p->o_flags;
1214 t->parms.fwmark = p->fwmark;
1215 t->parms.erspan_ver = p->erspan_ver;
1216 t->parms.index = p->index;
1217 t->parms.dir = p->dir;
1218 t->parms.hwid = p->hwid;
1219 dst_cache_reset(&t->dst_cache);
1220 }
1221
ip6gre_tnl_change(struct ip6_tnl * t,const struct __ip6_tnl_parm * p,int set_mtu)1222 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1223 int set_mtu)
1224 {
1225 ip6gre_tnl_copy_tnl_parm(t, p);
1226 ip6gre_tnl_link_config(t, set_mtu);
1227 return 0;
1228 }
1229
ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm * p,const struct ip6_tnl_parm2 * u)1230 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1231 const struct ip6_tnl_parm2 *u)
1232 {
1233 p->laddr = u->laddr;
1234 p->raddr = u->raddr;
1235 p->flags = u->flags;
1236 p->hop_limit = u->hop_limit;
1237 p->encap_limit = u->encap_limit;
1238 p->flowinfo = u->flowinfo;
1239 p->link = u->link;
1240 p->i_key = u->i_key;
1241 p->o_key = u->o_key;
1242 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1243 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1244 memcpy(p->name, u->name, sizeof(u->name));
1245 }
1246
ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 * u,const struct __ip6_tnl_parm * p)1247 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1248 const struct __ip6_tnl_parm *p)
1249 {
1250 u->proto = IPPROTO_GRE;
1251 u->laddr = p->laddr;
1252 u->raddr = p->raddr;
1253 u->flags = p->flags;
1254 u->hop_limit = p->hop_limit;
1255 u->encap_limit = p->encap_limit;
1256 u->flowinfo = p->flowinfo;
1257 u->link = p->link;
1258 u->i_key = p->i_key;
1259 u->o_key = p->o_key;
1260 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1261 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1262 memcpy(u->name, p->name, sizeof(u->name));
1263 }
1264
ip6gre_tunnel_ioctl(struct net_device * dev,struct ifreq * ifr,int cmd)1265 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1266 struct ifreq *ifr, int cmd)
1267 {
1268 int err = 0;
1269 struct ip6_tnl_parm2 p;
1270 struct __ip6_tnl_parm p1;
1271 struct ip6_tnl *t = netdev_priv(dev);
1272 struct net *net = t->net;
1273 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1274
1275 memset(&p1, 0, sizeof(p1));
1276
1277 switch (cmd) {
1278 case SIOCGETTUNNEL:
1279 if (dev == ign->fb_tunnel_dev) {
1280 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1281 err = -EFAULT;
1282 break;
1283 }
1284 ip6gre_tnl_parm_from_user(&p1, &p);
1285 t = ip6gre_tunnel_locate(net, &p1, 0);
1286 if (!t)
1287 t = netdev_priv(dev);
1288 }
1289 memset(&p, 0, sizeof(p));
1290 ip6gre_tnl_parm_to_user(&p, &t->parms);
1291 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1292 err = -EFAULT;
1293 break;
1294
1295 case SIOCADDTUNNEL:
1296 case SIOCCHGTUNNEL:
1297 err = -EPERM;
1298 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1299 goto done;
1300
1301 err = -EFAULT;
1302 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1303 goto done;
1304
1305 err = -EINVAL;
1306 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1307 goto done;
1308
1309 if (!(p.i_flags&GRE_KEY))
1310 p.i_key = 0;
1311 if (!(p.o_flags&GRE_KEY))
1312 p.o_key = 0;
1313
1314 ip6gre_tnl_parm_from_user(&p1, &p);
1315 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1316
1317 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1318 if (t) {
1319 if (t->dev != dev) {
1320 err = -EEXIST;
1321 break;
1322 }
1323 } else {
1324 t = netdev_priv(dev);
1325
1326 ip6gre_tunnel_unlink(ign, t);
1327 synchronize_net();
1328 ip6gre_tnl_change(t, &p1, 1);
1329 ip6gre_tunnel_link(ign, t);
1330 netdev_state_change(dev);
1331 }
1332 }
1333
1334 if (t) {
1335 err = 0;
1336
1337 memset(&p, 0, sizeof(p));
1338 ip6gre_tnl_parm_to_user(&p, &t->parms);
1339 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1340 err = -EFAULT;
1341 } else
1342 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1343 break;
1344
1345 case SIOCDELTUNNEL:
1346 err = -EPERM;
1347 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1348 goto done;
1349
1350 if (dev == ign->fb_tunnel_dev) {
1351 err = -EFAULT;
1352 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1353 goto done;
1354 err = -ENOENT;
1355 ip6gre_tnl_parm_from_user(&p1, &p);
1356 t = ip6gre_tunnel_locate(net, &p1, 0);
1357 if (!t)
1358 goto done;
1359 err = -EPERM;
1360 if (t == netdev_priv(ign->fb_tunnel_dev))
1361 goto done;
1362 dev = t->dev;
1363 }
1364 unregister_netdevice(dev);
1365 err = 0;
1366 break;
1367
1368 default:
1369 err = -EINVAL;
1370 }
1371
1372 done:
1373 return err;
1374 }
1375
ip6gre_header(struct sk_buff * skb,struct net_device * dev,unsigned short type,const void * daddr,const void * saddr,unsigned int len)1376 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1377 unsigned short type, const void *daddr,
1378 const void *saddr, unsigned int len)
1379 {
1380 struct ip6_tnl *t = netdev_priv(dev);
1381 struct ipv6hdr *ipv6h;
1382 __be16 *p;
1383
1384 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1385 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1386 t->fl.u.ip6.flowlabel,
1387 true, &t->fl.u.ip6));
1388 ipv6h->hop_limit = t->parms.hop_limit;
1389 ipv6h->nexthdr = NEXTHDR_GRE;
1390 ipv6h->saddr = t->parms.laddr;
1391 ipv6h->daddr = t->parms.raddr;
1392
1393 p = (__be16 *)(ipv6h + 1);
1394 p[0] = t->parms.o_flags;
1395 p[1] = htons(type);
1396
1397 /*
1398 * Set the source hardware address.
1399 */
1400
1401 if (saddr)
1402 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1403 if (daddr)
1404 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1405 if (!ipv6_addr_any(&ipv6h->daddr))
1406 return t->hlen;
1407
1408 return -t->hlen;
1409 }
1410
1411 static const struct header_ops ip6gre_header_ops = {
1412 .create = ip6gre_header,
1413 };
1414
1415 static const struct net_device_ops ip6gre_netdev_ops = {
1416 .ndo_init = ip6gre_tunnel_init,
1417 .ndo_uninit = ip6gre_tunnel_uninit,
1418 .ndo_start_xmit = ip6gre_tunnel_xmit,
1419 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1420 .ndo_change_mtu = ip6_tnl_change_mtu,
1421 .ndo_get_stats64 = ip_tunnel_get_stats64,
1422 .ndo_get_iflink = ip6_tnl_get_iflink,
1423 };
1424
ip6gre_dev_free(struct net_device * dev)1425 static void ip6gre_dev_free(struct net_device *dev)
1426 {
1427 struct ip6_tnl *t = netdev_priv(dev);
1428
1429 gro_cells_destroy(&t->gro_cells);
1430 dst_cache_destroy(&t->dst_cache);
1431 free_percpu(dev->tstats);
1432 }
1433
ip6gre_tunnel_setup(struct net_device * dev)1434 static void ip6gre_tunnel_setup(struct net_device *dev)
1435 {
1436 dev->netdev_ops = &ip6gre_netdev_ops;
1437 dev->needs_free_netdev = true;
1438 dev->priv_destructor = ip6gre_dev_free;
1439
1440 dev->type = ARPHRD_IP6GRE;
1441
1442 dev->flags |= IFF_NOARP;
1443 dev->addr_len = sizeof(struct in6_addr);
1444 netif_keep_dst(dev);
1445 /* This perm addr will be used as interface identifier by IPv6 */
1446 dev->addr_assign_type = NET_ADDR_RANDOM;
1447 eth_random_addr(dev->perm_addr);
1448 }
1449
1450 #define GRE6_FEATURES (NETIF_F_SG | \
1451 NETIF_F_FRAGLIST | \
1452 NETIF_F_HIGHDMA | \
1453 NETIF_F_HW_CSUM)
1454
ip6gre_tnl_init_features(struct net_device * dev)1455 static void ip6gre_tnl_init_features(struct net_device *dev)
1456 {
1457 struct ip6_tnl *nt = netdev_priv(dev);
1458
1459 dev->features |= GRE6_FEATURES;
1460 dev->hw_features |= GRE6_FEATURES;
1461
1462 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1463 /* TCP offload with GRE SEQ is not supported, nor
1464 * can we support 2 levels of outer headers requiring
1465 * an update.
1466 */
1467 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1468 nt->encap.type == TUNNEL_ENCAP_NONE) {
1469 dev->features |= NETIF_F_GSO_SOFTWARE;
1470 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1471 }
1472
1473 /* Can use a lockless transmit, unless we generate
1474 * output sequences
1475 */
1476 dev->features |= NETIF_F_LLTX;
1477 }
1478 }
1479
ip6gre_tunnel_init_common(struct net_device * dev)1480 static int ip6gre_tunnel_init_common(struct net_device *dev)
1481 {
1482 struct ip6_tnl *tunnel;
1483 int ret;
1484 int t_hlen;
1485
1486 tunnel = netdev_priv(dev);
1487
1488 tunnel->dev = dev;
1489 tunnel->net = dev_net(dev);
1490 strcpy(tunnel->parms.name, dev->name);
1491
1492 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1493 if (!dev->tstats)
1494 return -ENOMEM;
1495
1496 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1497 if (ret)
1498 goto cleanup_alloc_pcpu_stats;
1499
1500 ret = gro_cells_init(&tunnel->gro_cells, dev);
1501 if (ret)
1502 goto cleanup_dst_cache_init;
1503
1504 t_hlen = ip6gre_calc_hlen(tunnel);
1505 dev->mtu = ETH_DATA_LEN - t_hlen;
1506 if (dev->type == ARPHRD_ETHER)
1507 dev->mtu -= ETH_HLEN;
1508 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1509 dev->mtu -= 8;
1510
1511 if (tunnel->parms.collect_md) {
1512 netif_keep_dst(dev);
1513 }
1514 ip6gre_tnl_init_features(dev);
1515
1516 dev_hold(dev);
1517 return 0;
1518
1519 cleanup_dst_cache_init:
1520 dst_cache_destroy(&tunnel->dst_cache);
1521 cleanup_alloc_pcpu_stats:
1522 free_percpu(dev->tstats);
1523 dev->tstats = NULL;
1524 return ret;
1525 }
1526
ip6gre_tunnel_init(struct net_device * dev)1527 static int ip6gre_tunnel_init(struct net_device *dev)
1528 {
1529 struct ip6_tnl *tunnel;
1530 int ret;
1531
1532 ret = ip6gre_tunnel_init_common(dev);
1533 if (ret)
1534 return ret;
1535
1536 tunnel = netdev_priv(dev);
1537
1538 if (tunnel->parms.collect_md)
1539 return 0;
1540
1541 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1542 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1543
1544 if (ipv6_addr_any(&tunnel->parms.raddr))
1545 dev->header_ops = &ip6gre_header_ops;
1546
1547 return 0;
1548 }
1549
ip6gre_fb_tunnel_init(struct net_device * dev)1550 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1551 {
1552 struct ip6_tnl *tunnel = netdev_priv(dev);
1553
1554 tunnel->dev = dev;
1555 tunnel->net = dev_net(dev);
1556 strcpy(tunnel->parms.name, dev->name);
1557
1558 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1559 }
1560
1561 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1562 .handler = gre_rcv,
1563 .err_handler = ip6gre_err,
1564 .flags = INET6_PROTO_FINAL,
1565 };
1566
ip6gre_destroy_tunnels(struct net * net,struct list_head * head)1567 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1568 {
1569 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1570 struct net_device *dev, *aux;
1571 int prio;
1572
1573 for_each_netdev_safe(net, dev, aux)
1574 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1575 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1576 dev->rtnl_link_ops == &ip6erspan_tap_ops)
1577 unregister_netdevice_queue(dev, head);
1578
1579 for (prio = 0; prio < 4; prio++) {
1580 int h;
1581 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1582 struct ip6_tnl *t;
1583
1584 t = rtnl_dereference(ign->tunnels[prio][h]);
1585
1586 while (t) {
1587 /* If dev is in the same netns, it has already
1588 * been added to the list by the previous loop.
1589 */
1590 if (!net_eq(dev_net(t->dev), net))
1591 unregister_netdevice_queue(t->dev,
1592 head);
1593 t = rtnl_dereference(t->next);
1594 }
1595 }
1596 }
1597 }
1598
ip6gre_init_net(struct net * net)1599 static int __net_init ip6gre_init_net(struct net *net)
1600 {
1601 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1602 struct net_device *ndev;
1603 int err;
1604
1605 if (!net_has_fallback_tunnels(net))
1606 return 0;
1607 ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1608 NET_NAME_UNKNOWN, ip6gre_tunnel_setup);
1609 if (!ndev) {
1610 err = -ENOMEM;
1611 goto err_alloc_dev;
1612 }
1613 ign->fb_tunnel_dev = ndev;
1614 dev_net_set(ign->fb_tunnel_dev, net);
1615 /* FB netdevice is special: we have one, and only one per netns.
1616 * Allowing to move it to another netns is clearly unsafe.
1617 */
1618 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1619
1620
1621 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1622 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1623
1624 err = register_netdev(ign->fb_tunnel_dev);
1625 if (err)
1626 goto err_reg_dev;
1627
1628 rcu_assign_pointer(ign->tunnels_wc[0],
1629 netdev_priv(ign->fb_tunnel_dev));
1630 return 0;
1631
1632 err_reg_dev:
1633 free_netdev(ndev);
1634 err_alloc_dev:
1635 return err;
1636 }
1637
ip6gre_exit_batch_net(struct list_head * net_list)1638 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1639 {
1640 struct net *net;
1641 LIST_HEAD(list);
1642
1643 rtnl_lock();
1644 list_for_each_entry(net, net_list, exit_list)
1645 ip6gre_destroy_tunnels(net, &list);
1646 unregister_netdevice_many(&list);
1647 rtnl_unlock();
1648 }
1649
1650 static struct pernet_operations ip6gre_net_ops = {
1651 .init = ip6gre_init_net,
1652 .exit_batch = ip6gre_exit_batch_net,
1653 .id = &ip6gre_net_id,
1654 .size = sizeof(struct ip6gre_net),
1655 };
1656
ip6gre_tunnel_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1657 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1658 struct netlink_ext_ack *extack)
1659 {
1660 __be16 flags;
1661
1662 if (!data)
1663 return 0;
1664
1665 flags = 0;
1666 if (data[IFLA_GRE_IFLAGS])
1667 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1668 if (data[IFLA_GRE_OFLAGS])
1669 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1670 if (flags & (GRE_VERSION|GRE_ROUTING))
1671 return -EINVAL;
1672
1673 return 0;
1674 }
1675
ip6gre_tap_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1676 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1677 struct netlink_ext_ack *extack)
1678 {
1679 struct in6_addr daddr;
1680
1681 if (tb[IFLA_ADDRESS]) {
1682 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1683 return -EINVAL;
1684 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1685 return -EADDRNOTAVAIL;
1686 }
1687
1688 if (!data)
1689 goto out;
1690
1691 if (data[IFLA_GRE_REMOTE]) {
1692 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1693 if (ipv6_addr_any(&daddr))
1694 return -EINVAL;
1695 }
1696
1697 out:
1698 return ip6gre_tunnel_validate(tb, data, extack);
1699 }
1700
ip6erspan_tap_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1701 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1702 struct netlink_ext_ack *extack)
1703 {
1704 __be16 flags = 0;
1705 int ret, ver = 0;
1706
1707 if (!data)
1708 return 0;
1709
1710 ret = ip6gre_tap_validate(tb, data, extack);
1711 if (ret)
1712 return ret;
1713
1714 /* ERSPAN should only have GRE sequence and key flag */
1715 if (data[IFLA_GRE_OFLAGS])
1716 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1717 if (data[IFLA_GRE_IFLAGS])
1718 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1719 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1720 flags != (GRE_SEQ | GRE_KEY))
1721 return -EINVAL;
1722
1723 /* ERSPAN Session ID only has 10-bit. Since we reuse
1724 * 32-bit key field as ID, check it's range.
1725 */
1726 if (data[IFLA_GRE_IKEY] &&
1727 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1728 return -EINVAL;
1729
1730 if (data[IFLA_GRE_OKEY] &&
1731 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1732 return -EINVAL;
1733
1734 if (data[IFLA_GRE_ERSPAN_VER]) {
1735 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1736 if (ver != 1 && ver != 2)
1737 return -EINVAL;
1738 }
1739
1740 if (ver == 1) {
1741 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1742 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1743
1744 if (index & ~INDEX_MASK)
1745 return -EINVAL;
1746 }
1747 } else if (ver == 2) {
1748 if (data[IFLA_GRE_ERSPAN_DIR]) {
1749 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1750
1751 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1752 return -EINVAL;
1753 }
1754
1755 if (data[IFLA_GRE_ERSPAN_HWID]) {
1756 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1757
1758 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1759 return -EINVAL;
1760 }
1761 }
1762
1763 return 0;
1764 }
1765
ip6erspan_set_version(struct nlattr * data[],struct __ip6_tnl_parm * parms)1766 static void ip6erspan_set_version(struct nlattr *data[],
1767 struct __ip6_tnl_parm *parms)
1768 {
1769 if (!data)
1770 return;
1771
1772 parms->erspan_ver = 1;
1773 if (data[IFLA_GRE_ERSPAN_VER])
1774 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1775
1776 if (parms->erspan_ver == 1) {
1777 if (data[IFLA_GRE_ERSPAN_INDEX])
1778 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1779 } else if (parms->erspan_ver == 2) {
1780 if (data[IFLA_GRE_ERSPAN_DIR])
1781 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1782 if (data[IFLA_GRE_ERSPAN_HWID])
1783 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1784 }
1785 }
1786
ip6gre_netlink_parms(struct nlattr * data[],struct __ip6_tnl_parm * parms)1787 static void ip6gre_netlink_parms(struct nlattr *data[],
1788 struct __ip6_tnl_parm *parms)
1789 {
1790 memset(parms, 0, sizeof(*parms));
1791
1792 if (!data)
1793 return;
1794
1795 if (data[IFLA_GRE_LINK])
1796 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1797
1798 if (data[IFLA_GRE_IFLAGS])
1799 parms->i_flags = gre_flags_to_tnl_flags(
1800 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1801
1802 if (data[IFLA_GRE_OFLAGS])
1803 parms->o_flags = gre_flags_to_tnl_flags(
1804 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1805
1806 if (data[IFLA_GRE_IKEY])
1807 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1808
1809 if (data[IFLA_GRE_OKEY])
1810 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1811
1812 if (data[IFLA_GRE_LOCAL])
1813 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1814
1815 if (data[IFLA_GRE_REMOTE])
1816 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1817
1818 if (data[IFLA_GRE_TTL])
1819 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1820
1821 if (data[IFLA_GRE_ENCAP_LIMIT])
1822 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1823
1824 if (data[IFLA_GRE_FLOWINFO])
1825 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1826
1827 if (data[IFLA_GRE_FLAGS])
1828 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1829
1830 if (data[IFLA_GRE_FWMARK])
1831 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1832
1833 if (data[IFLA_GRE_COLLECT_METADATA])
1834 parms->collect_md = true;
1835 }
1836
ip6gre_tap_init(struct net_device * dev)1837 static int ip6gre_tap_init(struct net_device *dev)
1838 {
1839 int ret;
1840
1841 ret = ip6gre_tunnel_init_common(dev);
1842 if (ret)
1843 return ret;
1844
1845 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1846
1847 return 0;
1848 }
1849
1850 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1851 .ndo_init = ip6gre_tap_init,
1852 .ndo_uninit = ip6gre_tunnel_uninit,
1853 .ndo_start_xmit = ip6gre_tunnel_xmit,
1854 .ndo_set_mac_address = eth_mac_addr,
1855 .ndo_validate_addr = eth_validate_addr,
1856 .ndo_change_mtu = ip6_tnl_change_mtu,
1857 .ndo_get_stats64 = ip_tunnel_get_stats64,
1858 .ndo_get_iflink = ip6_tnl_get_iflink,
1859 };
1860
ip6erspan_calc_hlen(struct ip6_tnl * tunnel)1861 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1862 {
1863 int t_hlen;
1864
1865 tunnel->tun_hlen = 8;
1866 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1867 erspan_hdr_len(tunnel->parms.erspan_ver);
1868
1869 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1870 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1871 return t_hlen;
1872 }
1873
ip6erspan_tap_init(struct net_device * dev)1874 static int ip6erspan_tap_init(struct net_device *dev)
1875 {
1876 struct ip6_tnl *tunnel;
1877 int t_hlen;
1878 int ret;
1879
1880 tunnel = netdev_priv(dev);
1881
1882 tunnel->dev = dev;
1883 tunnel->net = dev_net(dev);
1884 strcpy(tunnel->parms.name, dev->name);
1885
1886 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1887 if (!dev->tstats)
1888 return -ENOMEM;
1889
1890 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1891 if (ret)
1892 goto cleanup_alloc_pcpu_stats;
1893
1894 ret = gro_cells_init(&tunnel->gro_cells, dev);
1895 if (ret)
1896 goto cleanup_dst_cache_init;
1897
1898 t_hlen = ip6erspan_calc_hlen(tunnel);
1899 dev->mtu = ETH_DATA_LEN - t_hlen;
1900 if (dev->type == ARPHRD_ETHER)
1901 dev->mtu -= ETH_HLEN;
1902 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1903 dev->mtu -= 8;
1904
1905 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1906 ip6erspan_tnl_link_config(tunnel, 1);
1907
1908 dev_hold(dev);
1909 return 0;
1910
1911 cleanup_dst_cache_init:
1912 dst_cache_destroy(&tunnel->dst_cache);
1913 cleanup_alloc_pcpu_stats:
1914 free_percpu(dev->tstats);
1915 dev->tstats = NULL;
1916 return ret;
1917 }
1918
1919 static const struct net_device_ops ip6erspan_netdev_ops = {
1920 .ndo_init = ip6erspan_tap_init,
1921 .ndo_uninit = ip6erspan_tunnel_uninit,
1922 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1923 .ndo_set_mac_address = eth_mac_addr,
1924 .ndo_validate_addr = eth_validate_addr,
1925 .ndo_change_mtu = ip6_tnl_change_mtu,
1926 .ndo_get_stats64 = ip_tunnel_get_stats64,
1927 .ndo_get_iflink = ip6_tnl_get_iflink,
1928 };
1929
ip6gre_tap_setup(struct net_device * dev)1930 static void ip6gre_tap_setup(struct net_device *dev)
1931 {
1932
1933 ether_setup(dev);
1934
1935 dev->max_mtu = 0;
1936 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1937 dev->needs_free_netdev = true;
1938 dev->priv_destructor = ip6gre_dev_free;
1939
1940 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1941 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1942 netif_keep_dst(dev);
1943 }
1944
ip6gre_netlink_encap_parms(struct nlattr * data[],struct ip_tunnel_encap * ipencap)1945 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1946 struct ip_tunnel_encap *ipencap)
1947 {
1948 bool ret = false;
1949
1950 memset(ipencap, 0, sizeof(*ipencap));
1951
1952 if (!data)
1953 return ret;
1954
1955 if (data[IFLA_GRE_ENCAP_TYPE]) {
1956 ret = true;
1957 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1958 }
1959
1960 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1961 ret = true;
1962 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1963 }
1964
1965 if (data[IFLA_GRE_ENCAP_SPORT]) {
1966 ret = true;
1967 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1968 }
1969
1970 if (data[IFLA_GRE_ENCAP_DPORT]) {
1971 ret = true;
1972 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1973 }
1974
1975 return ret;
1976 }
1977
ip6gre_newlink_common(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1978 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1979 struct nlattr *tb[], struct nlattr *data[],
1980 struct netlink_ext_ack *extack)
1981 {
1982 struct ip6_tnl *nt;
1983 struct ip_tunnel_encap ipencap;
1984 int err;
1985
1986 nt = netdev_priv(dev);
1987
1988 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1989 int err = ip6_tnl_encap_setup(nt, &ipencap);
1990
1991 if (err < 0)
1992 return err;
1993 }
1994
1995 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1996 eth_hw_addr_random(dev);
1997
1998 nt->dev = dev;
1999 nt->net = dev_net(dev);
2000
2001 err = register_netdevice(dev);
2002 if (err)
2003 goto out;
2004
2005 if (tb[IFLA_MTU])
2006 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2007
2008 out:
2009 return err;
2010 }
2011
ip6gre_newlink(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2012 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
2013 struct nlattr *tb[], struct nlattr *data[],
2014 struct netlink_ext_ack *extack)
2015 {
2016 struct ip6_tnl *nt = netdev_priv(dev);
2017 struct net *net = dev_net(dev);
2018 struct ip6gre_net *ign;
2019 int err;
2020
2021 ip6gre_netlink_parms(data, &nt->parms);
2022 ign = net_generic(net, ip6gre_net_id);
2023
2024 if (nt->parms.collect_md) {
2025 if (rtnl_dereference(ign->collect_md_tun))
2026 return -EEXIST;
2027 } else {
2028 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2029 return -EEXIST;
2030 }
2031
2032 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2033 if (!err) {
2034 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
2035 ip6gre_tunnel_link_md(ign, nt);
2036 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2037 }
2038 return err;
2039 }
2040
2041 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)2042 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2043 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2044 struct netlink_ext_ack *extack)
2045 {
2046 struct ip6_tnl *t, *nt = netdev_priv(dev);
2047 struct net *net = nt->net;
2048 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2049 struct ip_tunnel_encap ipencap;
2050
2051 if (dev == ign->fb_tunnel_dev)
2052 return ERR_PTR(-EINVAL);
2053
2054 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2055 int err = ip6_tnl_encap_setup(nt, &ipencap);
2056
2057 if (err < 0)
2058 return ERR_PTR(err);
2059 }
2060
2061 ip6gre_netlink_parms(data, p_p);
2062
2063 t = ip6gre_tunnel_locate(net, p_p, 0);
2064
2065 if (t) {
2066 if (t->dev != dev)
2067 return ERR_PTR(-EEXIST);
2068 } else {
2069 t = nt;
2070 }
2071
2072 return t;
2073 }
2074
ip6gre_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2075 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2076 struct nlattr *data[],
2077 struct netlink_ext_ack *extack)
2078 {
2079 struct ip6_tnl *t = netdev_priv(dev);
2080 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2081 struct __ip6_tnl_parm p;
2082
2083 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2084 if (IS_ERR(t))
2085 return PTR_ERR(t);
2086
2087 ip6gre_tunnel_unlink_md(ign, t);
2088 ip6gre_tunnel_unlink(ign, t);
2089 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2090 ip6gre_tunnel_link_md(ign, t);
2091 ip6gre_tunnel_link(ign, t);
2092 return 0;
2093 }
2094
ip6gre_dellink(struct net_device * dev,struct list_head * head)2095 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2096 {
2097 struct net *net = dev_net(dev);
2098 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2099
2100 if (dev != ign->fb_tunnel_dev)
2101 unregister_netdevice_queue(dev, head);
2102 }
2103
ip6gre_get_size(const struct net_device * dev)2104 static size_t ip6gre_get_size(const struct net_device *dev)
2105 {
2106 return
2107 /* IFLA_GRE_LINK */
2108 nla_total_size(4) +
2109 /* IFLA_GRE_IFLAGS */
2110 nla_total_size(2) +
2111 /* IFLA_GRE_OFLAGS */
2112 nla_total_size(2) +
2113 /* IFLA_GRE_IKEY */
2114 nla_total_size(4) +
2115 /* IFLA_GRE_OKEY */
2116 nla_total_size(4) +
2117 /* IFLA_GRE_LOCAL */
2118 nla_total_size(sizeof(struct in6_addr)) +
2119 /* IFLA_GRE_REMOTE */
2120 nla_total_size(sizeof(struct in6_addr)) +
2121 /* IFLA_GRE_TTL */
2122 nla_total_size(1) +
2123 /* IFLA_GRE_ENCAP_LIMIT */
2124 nla_total_size(1) +
2125 /* IFLA_GRE_FLOWINFO */
2126 nla_total_size(4) +
2127 /* IFLA_GRE_FLAGS */
2128 nla_total_size(4) +
2129 /* IFLA_GRE_ENCAP_TYPE */
2130 nla_total_size(2) +
2131 /* IFLA_GRE_ENCAP_FLAGS */
2132 nla_total_size(2) +
2133 /* IFLA_GRE_ENCAP_SPORT */
2134 nla_total_size(2) +
2135 /* IFLA_GRE_ENCAP_DPORT */
2136 nla_total_size(2) +
2137 /* IFLA_GRE_COLLECT_METADATA */
2138 nla_total_size(0) +
2139 /* IFLA_GRE_FWMARK */
2140 nla_total_size(4) +
2141 /* IFLA_GRE_ERSPAN_INDEX */
2142 nla_total_size(4) +
2143 0;
2144 }
2145
ip6gre_fill_info(struct sk_buff * skb,const struct net_device * dev)2146 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2147 {
2148 struct ip6_tnl *t = netdev_priv(dev);
2149 struct __ip6_tnl_parm *p = &t->parms;
2150 __be16 o_flags = p->o_flags;
2151
2152 if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2153 if (!p->collect_md)
2154 o_flags |= TUNNEL_KEY;
2155
2156 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2157 goto nla_put_failure;
2158
2159 if (p->erspan_ver == 1) {
2160 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2161 goto nla_put_failure;
2162 } else {
2163 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2164 goto nla_put_failure;
2165 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2166 goto nla_put_failure;
2167 }
2168 }
2169
2170 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2171 nla_put_be16(skb, IFLA_GRE_IFLAGS,
2172 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2173 nla_put_be16(skb, IFLA_GRE_OFLAGS,
2174 gre_tnl_flags_to_gre_flags(o_flags)) ||
2175 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2176 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2177 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2178 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2179 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2180 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2181 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2182 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2183 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
2184 goto nla_put_failure;
2185
2186 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2187 t->encap.type) ||
2188 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2189 t->encap.sport) ||
2190 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2191 t->encap.dport) ||
2192 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2193 t->encap.flags))
2194 goto nla_put_failure;
2195
2196 if (p->collect_md) {
2197 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2198 goto nla_put_failure;
2199 }
2200
2201 return 0;
2202
2203 nla_put_failure:
2204 return -EMSGSIZE;
2205 }
2206
2207 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2208 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2209 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2210 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2211 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2212 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2213 [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct ipv6hdr, saddr) },
2214 [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct ipv6hdr, daddr) },
2215 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2216 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2217 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2218 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
2219 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2220 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2221 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2222 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
2223 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2224 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
2225 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2226 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2227 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2228 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
2229 };
2230
ip6erspan_tap_setup(struct net_device * dev)2231 static void ip6erspan_tap_setup(struct net_device *dev)
2232 {
2233 ether_setup(dev);
2234
2235 dev->max_mtu = 0;
2236 dev->netdev_ops = &ip6erspan_netdev_ops;
2237 dev->needs_free_netdev = true;
2238 dev->priv_destructor = ip6gre_dev_free;
2239
2240 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2241 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2242 netif_keep_dst(dev);
2243 }
2244
ip6erspan_newlink(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2245 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2246 struct nlattr *tb[], struct nlattr *data[],
2247 struct netlink_ext_ack *extack)
2248 {
2249 struct ip6_tnl *nt = netdev_priv(dev);
2250 struct net *net = dev_net(dev);
2251 struct ip6gre_net *ign;
2252 int err;
2253
2254 ip6gre_netlink_parms(data, &nt->parms);
2255 ip6erspan_set_version(data, &nt->parms);
2256 ign = net_generic(net, ip6gre_net_id);
2257
2258 if (nt->parms.collect_md) {
2259 if (rtnl_dereference(ign->collect_md_tun_erspan))
2260 return -EEXIST;
2261 } else {
2262 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2263 return -EEXIST;
2264 }
2265
2266 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2267 if (!err) {
2268 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2269 ip6erspan_tunnel_link_md(ign, nt);
2270 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2271 }
2272 return err;
2273 }
2274
ip6erspan_tnl_link_config(struct ip6_tnl * t,int set_mtu)2275 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2276 {
2277 ip6gre_tnl_link_config_common(t);
2278 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2279 }
2280
ip6erspan_tnl_change(struct ip6_tnl * t,const struct __ip6_tnl_parm * p,int set_mtu)2281 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2282 const struct __ip6_tnl_parm *p, int set_mtu)
2283 {
2284 ip6gre_tnl_copy_tnl_parm(t, p);
2285 ip6erspan_tnl_link_config(t, set_mtu);
2286 return 0;
2287 }
2288
ip6erspan_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2289 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2290 struct nlattr *data[],
2291 struct netlink_ext_ack *extack)
2292 {
2293 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2294 struct __ip6_tnl_parm p;
2295 struct ip6_tnl *t;
2296
2297 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2298 if (IS_ERR(t))
2299 return PTR_ERR(t);
2300
2301 ip6erspan_set_version(data, &p);
2302 ip6gre_tunnel_unlink_md(ign, t);
2303 ip6gre_tunnel_unlink(ign, t);
2304 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2305 ip6erspan_tunnel_link_md(ign, t);
2306 ip6gre_tunnel_link(ign, t);
2307 return 0;
2308 }
2309
2310 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2311 .kind = "ip6gre",
2312 .maxtype = IFLA_GRE_MAX,
2313 .policy = ip6gre_policy,
2314 .priv_size = sizeof(struct ip6_tnl),
2315 .setup = ip6gre_tunnel_setup,
2316 .validate = ip6gre_tunnel_validate,
2317 .newlink = ip6gre_newlink,
2318 .changelink = ip6gre_changelink,
2319 .dellink = ip6gre_dellink,
2320 .get_size = ip6gre_get_size,
2321 .fill_info = ip6gre_fill_info,
2322 .get_link_net = ip6_tnl_get_link_net,
2323 };
2324
2325 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2326 .kind = "ip6gretap",
2327 .maxtype = IFLA_GRE_MAX,
2328 .policy = ip6gre_policy,
2329 .priv_size = sizeof(struct ip6_tnl),
2330 .setup = ip6gre_tap_setup,
2331 .validate = ip6gre_tap_validate,
2332 .newlink = ip6gre_newlink,
2333 .changelink = ip6gre_changelink,
2334 .get_size = ip6gre_get_size,
2335 .fill_info = ip6gre_fill_info,
2336 .get_link_net = ip6_tnl_get_link_net,
2337 };
2338
2339 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2340 .kind = "ip6erspan",
2341 .maxtype = IFLA_GRE_MAX,
2342 .policy = ip6gre_policy,
2343 .priv_size = sizeof(struct ip6_tnl),
2344 .setup = ip6erspan_tap_setup,
2345 .validate = ip6erspan_tap_validate,
2346 .newlink = ip6erspan_newlink,
2347 .changelink = ip6erspan_changelink,
2348 .get_size = ip6gre_get_size,
2349 .fill_info = ip6gre_fill_info,
2350 .get_link_net = ip6_tnl_get_link_net,
2351 };
2352
2353 /*
2354 * And now the modules code and kernel interface.
2355 */
2356
ip6gre_init(void)2357 static int __init ip6gre_init(void)
2358 {
2359 int err;
2360
2361 pr_info("GRE over IPv6 tunneling driver\n");
2362
2363 err = register_pernet_device(&ip6gre_net_ops);
2364 if (err < 0)
2365 return err;
2366
2367 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2368 if (err < 0) {
2369 pr_info("%s: can't add protocol\n", __func__);
2370 goto add_proto_failed;
2371 }
2372
2373 err = rtnl_link_register(&ip6gre_link_ops);
2374 if (err < 0)
2375 goto rtnl_link_failed;
2376
2377 err = rtnl_link_register(&ip6gre_tap_ops);
2378 if (err < 0)
2379 goto tap_ops_failed;
2380
2381 err = rtnl_link_register(&ip6erspan_tap_ops);
2382 if (err < 0)
2383 goto erspan_link_failed;
2384
2385 out:
2386 return err;
2387
2388 erspan_link_failed:
2389 rtnl_link_unregister(&ip6gre_tap_ops);
2390 tap_ops_failed:
2391 rtnl_link_unregister(&ip6gre_link_ops);
2392 rtnl_link_failed:
2393 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2394 add_proto_failed:
2395 unregister_pernet_device(&ip6gre_net_ops);
2396 goto out;
2397 }
2398
ip6gre_fini(void)2399 static void __exit ip6gre_fini(void)
2400 {
2401 rtnl_link_unregister(&ip6gre_tap_ops);
2402 rtnl_link_unregister(&ip6gre_link_ops);
2403 rtnl_link_unregister(&ip6erspan_tap_ops);
2404 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2405 unregister_pernet_device(&ip6gre_net_ops);
2406 }
2407
2408 module_init(ip6gre_init);
2409 module_exit(ip6gre_fini);
2410 MODULE_LICENSE("GPL");
2411 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2412 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2413 MODULE_ALIAS_RTNL_LINK("ip6gre");
2414 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2415 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2416 MODULE_ALIAS_NETDEV("ip6gre0");
2417