1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * GRE over IPv6 protocol decoder.
4 *
5 * Authors: Dmitry Kozlov (xeb@mail.ru)
6 */
7
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10 #include <linux/capability.h>
11 #include <linux/module.h>
12 #include <linux/types.h>
13 #include <linux/kernel.h>
14 #include <linux/slab.h>
15 #include <linux/uaccess.h>
16 #include <linux/skbuff.h>
17 #include <linux/netdevice.h>
18 #include <linux/in.h>
19 #include <linux/tcp.h>
20 #include <linux/udp.h>
21 #include <linux/if_arp.h>
22 #include <linux/init.h>
23 #include <linux/in6.h>
24 #include <linux/inetdevice.h>
25 #include <linux/igmp.h>
26 #include <linux/netfilter_ipv4.h>
27 #include <linux/etherdevice.h>
28 #include <linux/if_ether.h>
29 #include <linux/hash.h>
30 #include <linux/if_tunnel.h>
31 #include <linux/ip6_tunnel.h>
32
33 #include <net/sock.h>
34 #include <net/ip.h>
35 #include <net/ip_tunnels.h>
36 #include <net/icmp.h>
37 #include <net/protocol.h>
38 #include <net/addrconf.h>
39 #include <net/arp.h>
40 #include <net/checksum.h>
41 #include <net/dsfield.h>
42 #include <net/inet_ecn.h>
43 #include <net/xfrm.h>
44 #include <net/net_namespace.h>
45 #include <net/netns/generic.h>
46 #include <net/netdev_lock.h>
47 #include <net/rtnetlink.h>
48
49 #include <net/ipv6.h>
50 #include <net/ip6_fib.h>
51 #include <net/ip6_route.h>
52 #include <net/ip6_tunnel.h>
53 #include <net/gre.h>
54 #include <net/erspan.h>
55 #include <net/dst_metadata.h>
56
57
58 static bool log_ecn_error = true;
59 module_param(log_ecn_error, bool, 0644);
60 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
61
62 #define IP6_GRE_HASH_SIZE_SHIFT 5
63 #define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
64
65 static unsigned int ip6gre_net_id __read_mostly;
66 struct ip6gre_net {
67 struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
68
69 struct ip6_tnl __rcu *collect_md_tun;
70 struct ip6_tnl __rcu *collect_md_tun_erspan;
71 struct net_device *fb_tunnel_dev;
72 };
73
74 static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
75 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
76 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly;
77 static int ip6gre_tunnel_init(struct net_device *dev);
78 static void ip6gre_tunnel_setup(struct net_device *dev);
79 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
80 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
81 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu);
82
83 /* Tunnel hash table */
84
85 /*
86 4 hash tables:
87
88 3: (remote,local)
89 2: (remote,*)
90 1: (*,local)
91 0: (*,*)
92
93 We require exact key match i.e. if a key is present in packet
94 it will match only tunnel with the same key; if it is not present,
95 it will match only keyless tunnel.
96
97 All keysless packets, if not matched configured keyless tunnels
98 will match fallback tunnel.
99 */
100
101 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
HASH_ADDR(const struct in6_addr * addr)102 static u32 HASH_ADDR(const struct in6_addr *addr)
103 {
104 u32 hash = ipv6_addr_hash(addr);
105
106 return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
107 }
108
109 #define tunnels_r_l tunnels[3]
110 #define tunnels_r tunnels[2]
111 #define tunnels_l tunnels[1]
112 #define tunnels_wc tunnels[0]
113
ip6gre_tunnel_match(struct ip6_tnl * t,int dev_type,int link,int * cand_score,struct ip6_tnl ** ret)114 static bool ip6gre_tunnel_match(struct ip6_tnl *t, int dev_type, int link,
115 int *cand_score, struct ip6_tnl **ret)
116 {
117 int score = 0;
118
119 if (t->dev->type != ARPHRD_IP6GRE &&
120 t->dev->type != dev_type)
121 return false;
122
123 if (t->parms.link != link)
124 score |= 1;
125 if (t->dev->type != dev_type)
126 score |= 2;
127 if (score == 0) {
128 *ret = t;
129 return true;
130 }
131
132 if (score < *cand_score) {
133 *ret = t;
134 *cand_score = score;
135 }
136 return false;
137 }
138
139 /* Given src, dst and key, find appropriate for input tunnel. */
ip6gre_tunnel_lookup(struct net_device * dev,const struct in6_addr * remote,const struct in6_addr * local,__be32 key,__be16 gre_proto)140 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
141 const struct in6_addr *remote, const struct in6_addr *local,
142 __be32 key, __be16 gre_proto)
143 {
144 struct net *net = dev_net(dev);
145 int link = dev->ifindex;
146 unsigned int h0 = HASH_ADDR(remote);
147 unsigned int h1 = HASH_KEY(key);
148 struct ip6_tnl *t, *cand = NULL;
149 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
150 int dev_type = (gre_proto == htons(ETH_P_TEB) ||
151 gre_proto == htons(ETH_P_ERSPAN) ||
152 gre_proto == htons(ETH_P_ERSPAN2)) ?
153 ARPHRD_ETHER : ARPHRD_IP6GRE;
154 struct net_device *ndev;
155 int cand_score = 4;
156
157 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
158 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
159 !ipv6_addr_equal(remote, &t->parms.raddr) ||
160 key != t->parms.i_key ||
161 !(t->dev->flags & IFF_UP))
162 continue;
163
164 if (ip6gre_tunnel_match(t, dev_type, link, &cand_score, &cand))
165 return cand;
166 }
167
168 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
169 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
170 key != t->parms.i_key ||
171 !(t->dev->flags & IFF_UP))
172 continue;
173
174 if (ip6gre_tunnel_match(t, dev_type, link, &cand_score, &cand))
175 return cand;
176 }
177
178 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
179 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
180 (!ipv6_addr_equal(local, &t->parms.raddr) ||
181 !ipv6_addr_is_multicast(local))) ||
182 key != t->parms.i_key ||
183 !(t->dev->flags & IFF_UP))
184 continue;
185
186 if (ip6gre_tunnel_match(t, dev_type, link, &cand_score, &cand))
187 return cand;
188 }
189
190 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
191 if (t->parms.i_key != key ||
192 !(t->dev->flags & IFF_UP))
193 continue;
194
195 if (ip6gre_tunnel_match(t, dev_type, link, &cand_score, &cand))
196 return cand;
197 }
198
199 if (cand)
200 return cand;
201
202 if (gre_proto == htons(ETH_P_ERSPAN) ||
203 gre_proto == htons(ETH_P_ERSPAN2))
204 t = rcu_dereference(ign->collect_md_tun_erspan);
205 else
206 t = rcu_dereference(ign->collect_md_tun);
207
208 if (t && t->dev->flags & IFF_UP)
209 return t;
210
211 ndev = READ_ONCE(ign->fb_tunnel_dev);
212 if (ndev && ndev->flags & IFF_UP)
213 return netdev_priv(ndev);
214
215 return NULL;
216 }
217
__ip6gre_bucket(struct ip6gre_net * ign,const struct __ip6_tnl_parm * p)218 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
219 const struct __ip6_tnl_parm *p)
220 {
221 const struct in6_addr *remote = &p->raddr;
222 const struct in6_addr *local = &p->laddr;
223 unsigned int h = HASH_KEY(p->i_key);
224 int prio = 0;
225
226 if (!ipv6_addr_any(local))
227 prio |= 1;
228 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
229 prio |= 2;
230 h ^= HASH_ADDR(remote);
231 }
232
233 return &ign->tunnels[prio][h];
234 }
235
ip6gre_tunnel_link_md(struct ip6gre_net * ign,struct ip6_tnl * t)236 static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
237 {
238 if (t->parms.collect_md)
239 rcu_assign_pointer(ign->collect_md_tun, t);
240 }
241
ip6erspan_tunnel_link_md(struct ip6gre_net * ign,struct ip6_tnl * t)242 static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
243 {
244 if (t->parms.collect_md)
245 rcu_assign_pointer(ign->collect_md_tun_erspan, t);
246 }
247
ip6gre_tunnel_unlink_md(struct ip6gre_net * ign,struct ip6_tnl * t)248 static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t)
249 {
250 if (t->parms.collect_md)
251 rcu_assign_pointer(ign->collect_md_tun, NULL);
252 }
253
ip6erspan_tunnel_unlink_md(struct ip6gre_net * ign,struct ip6_tnl * t)254 static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign,
255 struct ip6_tnl *t)
256 {
257 if (t->parms.collect_md)
258 rcu_assign_pointer(ign->collect_md_tun_erspan, NULL);
259 }
260
ip6gre_bucket(struct ip6gre_net * ign,const struct ip6_tnl * t)261 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
262 const struct ip6_tnl *t)
263 {
264 return __ip6gre_bucket(ign, &t->parms);
265 }
266
ip6gre_tunnel_link(struct ip6gre_net * ign,struct ip6_tnl * t)267 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
268 {
269 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
270
271 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
272 rcu_assign_pointer(*tp, t);
273 }
274
ip6gre_tunnel_unlink(struct ip6gre_net * ign,struct ip6_tnl * t)275 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
276 {
277 struct ip6_tnl __rcu **tp;
278 struct ip6_tnl *iter;
279
280 for (tp = ip6gre_bucket(ign, t);
281 (iter = rtnl_dereference(*tp)) != NULL;
282 tp = &iter->next) {
283 if (t == iter) {
284 rcu_assign_pointer(*tp, t->next);
285 break;
286 }
287 }
288 }
289
ip6gre_tunnel_find(struct net * net,const struct __ip6_tnl_parm * parms,int type)290 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
291 const struct __ip6_tnl_parm *parms,
292 int type)
293 {
294 const struct in6_addr *remote = &parms->raddr;
295 const struct in6_addr *local = &parms->laddr;
296 __be32 key = parms->i_key;
297 int link = parms->link;
298 struct ip6_tnl *t;
299 struct ip6_tnl __rcu **tp;
300 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
301
302 for (tp = __ip6gre_bucket(ign, parms);
303 (t = rtnl_dereference(*tp)) != NULL;
304 tp = &t->next)
305 if (ipv6_addr_equal(local, &t->parms.laddr) &&
306 ipv6_addr_equal(remote, &t->parms.raddr) &&
307 key == t->parms.i_key &&
308 link == t->parms.link &&
309 type == t->dev->type)
310 break;
311
312 return t;
313 }
314
ip6gre_tunnel_locate(struct net * net,const struct __ip6_tnl_parm * parms,int create)315 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
316 const struct __ip6_tnl_parm *parms, int create)
317 {
318 struct ip6_tnl *t, *nt;
319 struct net_device *dev;
320 char name[IFNAMSIZ];
321 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
322
323 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
324 if (t && create)
325 return NULL;
326 if (t || !create)
327 return t;
328
329 if (parms->name[0]) {
330 if (!dev_valid_name(parms->name))
331 return NULL;
332 strscpy(name, parms->name, IFNAMSIZ);
333 } else {
334 strcpy(name, "ip6gre%d");
335 }
336 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
337 ip6gre_tunnel_setup);
338 if (!dev)
339 return NULL;
340
341 dev_net_set(dev, net);
342
343 nt = netdev_priv(dev);
344 nt->parms = *parms;
345 dev->rtnl_link_ops = &ip6gre_link_ops;
346
347 nt->dev = dev;
348 nt->net = dev_net(dev);
349
350 if (register_netdevice(dev) < 0)
351 goto failed_free;
352
353 ip6gre_tnl_link_config(nt, 1);
354 ip6gre_tunnel_link(ign, nt);
355 return nt;
356
357 failed_free:
358 free_netdev(dev);
359 return NULL;
360 }
361
ip6erspan_tunnel_uninit(struct net_device * dev)362 static void ip6erspan_tunnel_uninit(struct net_device *dev)
363 {
364 struct ip6_tnl *t = netdev_priv(dev);
365 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
366
367 ip6erspan_tunnel_unlink_md(ign, t);
368 ip6gre_tunnel_unlink(ign, t);
369 dst_cache_reset(&t->dst_cache);
370 netdev_put(dev, &t->dev_tracker);
371 }
372
ip6gre_tunnel_uninit(struct net_device * dev)373 static void ip6gre_tunnel_uninit(struct net_device *dev)
374 {
375 struct ip6_tnl *t = netdev_priv(dev);
376 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
377
378 ip6gre_tunnel_unlink_md(ign, t);
379 ip6gre_tunnel_unlink(ign, t);
380 if (ign->fb_tunnel_dev == dev)
381 WRITE_ONCE(ign->fb_tunnel_dev, NULL);
382 dst_cache_reset(&t->dst_cache);
383 netdev_put(dev, &t->dev_tracker);
384 }
385
386
ip6gre_err(struct sk_buff * skb,struct inet6_skb_parm * opt,u8 type,u8 code,int offset,__be32 info)387 static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
388 u8 type, u8 code, int offset, __be32 info)
389 {
390 struct net *net = dev_net(skb->dev);
391 const struct ipv6hdr *ipv6h;
392 struct tnl_ptk_info tpi;
393 struct ip6_tnl *t;
394
395 if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6),
396 offset) < 0)
397 return -EINVAL;
398
399 ipv6h = (const struct ipv6hdr *)skb->data;
400 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
401 tpi.key, tpi.proto);
402 if (!t)
403 return -ENOENT;
404
405 switch (type) {
406 case ICMPV6_DEST_UNREACH:
407 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
408 t->parms.name);
409 if (code != ICMPV6_PORT_UNREACH)
410 break;
411 return 0;
412 case ICMPV6_TIME_EXCEED:
413 if (code == ICMPV6_EXC_HOPLIMIT) {
414 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
415 t->parms.name);
416 break;
417 }
418 return 0;
419 case ICMPV6_PARAMPROB: {
420 struct ipv6_tlv_tnl_enc_lim *tel;
421 __u32 teli;
422
423 teli = 0;
424 if (code == ICMPV6_HDR_FIELD)
425 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
426
427 if (teli && teli == be32_to_cpu(info) - 2) {
428 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
429 if (tel->encap_limit == 0) {
430 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
431 t->parms.name);
432 }
433 } else {
434 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
435 t->parms.name);
436 }
437 return 0;
438 }
439 case ICMPV6_PKT_TOOBIG:
440 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
441 return 0;
442 case NDISC_REDIRECT:
443 ip6_redirect(skb, net, skb->dev->ifindex, 0,
444 sock_net_uid(net, NULL));
445 return 0;
446 }
447
448 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
449 t->err_count++;
450 else
451 t->err_count = 1;
452 t->err_time = jiffies;
453
454 return 0;
455 }
456
ip6gre_rcv(struct sk_buff * skb,const struct tnl_ptk_info * tpi)457 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
458 {
459 const struct ipv6hdr *ipv6h;
460 struct ip6_tnl *tunnel;
461
462 ipv6h = ipv6_hdr(skb);
463 tunnel = ip6gre_tunnel_lookup(skb->dev,
464 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
465 tpi->proto);
466 if (tunnel) {
467 if (tunnel->parms.collect_md) {
468 IP_TUNNEL_DECLARE_FLAGS(flags);
469 struct metadata_dst *tun_dst;
470 __be64 tun_id;
471
472 ip_tunnel_flags_copy(flags, tpi->flags);
473 tun_id = key32_to_tunnel_id(tpi->key);
474
475 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
476 if (!tun_dst)
477 return PACKET_REJECT;
478
479 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
480 } else {
481 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
482 }
483
484 return PACKET_RCVD;
485 }
486
487 return PACKET_REJECT;
488 }
489
ip6erspan_rcv(struct sk_buff * skb,struct tnl_ptk_info * tpi,int gre_hdr_len)490 static int ip6erspan_rcv(struct sk_buff *skb,
491 struct tnl_ptk_info *tpi,
492 int gre_hdr_len)
493 {
494 struct erspan_base_hdr *ershdr;
495 const struct ipv6hdr *ipv6h;
496 struct erspan_md2 *md2;
497 struct ip6_tnl *tunnel;
498 u8 ver;
499
500 if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr))))
501 return PACKET_REJECT;
502
503 ipv6h = ipv6_hdr(skb);
504 ershdr = (struct erspan_base_hdr *)skb->data;
505 ver = ershdr->ver;
506
507 tunnel = ip6gre_tunnel_lookup(skb->dev,
508 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
509 tpi->proto);
510 if (tunnel) {
511 int len = erspan_hdr_len(ver);
512
513 if (unlikely(!pskb_may_pull(skb, len)))
514 return PACKET_REJECT;
515
516 if (__iptunnel_pull_header(skb, len,
517 htons(ETH_P_TEB),
518 false, false) < 0)
519 return PACKET_REJECT;
520
521 if (tunnel->parms.collect_md) {
522 struct erspan_metadata *pkt_md, *md;
523 IP_TUNNEL_DECLARE_FLAGS(flags);
524 struct metadata_dst *tun_dst;
525 struct ip_tunnel_info *info;
526 unsigned char *gh;
527 __be64 tun_id;
528
529 __set_bit(IP_TUNNEL_KEY_BIT, tpi->flags);
530 ip_tunnel_flags_copy(flags, tpi->flags);
531 tun_id = key32_to_tunnel_id(tpi->key);
532
533 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
534 sizeof(*md));
535 if (!tun_dst)
536 return PACKET_REJECT;
537
538 /* skb can be uncloned in __iptunnel_pull_header, so
539 * old pkt_md is no longer valid and we need to reset
540 * it
541 */
542 gh = skb_network_header(skb) +
543 skb_network_header_len(skb);
544 pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len +
545 sizeof(*ershdr));
546 info = &tun_dst->u.tun_info;
547 md = ip_tunnel_info_opts(info);
548 md->version = ver;
549 md2 = &md->u.md2;
550 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
551 ERSPAN_V2_MDSIZE);
552 __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT,
553 info->key.tun_flags);
554 info->options_len = sizeof(*md);
555
556 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
557
558 } else {
559 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
560 }
561
562 return PACKET_RCVD;
563 }
564
565 return PACKET_REJECT;
566 }
567
gre_rcv(struct sk_buff * skb)568 static int gre_rcv(struct sk_buff *skb)
569 {
570 struct tnl_ptk_info tpi;
571 bool csum_err = false;
572 int hdr_len;
573
574 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
575 if (hdr_len < 0)
576 goto drop;
577
578 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
579 goto drop;
580
581 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
582 tpi.proto == htons(ETH_P_ERSPAN2))) {
583 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
584 return 0;
585 goto out;
586 }
587
588 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
589 return 0;
590
591 out:
592 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
593 drop:
594 kfree_skb(skb);
595 return 0;
596 }
597
gre_handle_offloads(struct sk_buff * skb,bool csum)598 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
599 {
600 return iptunnel_handle_offloads(skb,
601 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
602 }
603
prepare_ip6gre_xmit_ipv4(struct sk_buff * skb,struct net_device * dev,struct flowi6 * fl6,__u8 * dsfield,int * encap_limit)604 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
605 struct net_device *dev,
606 struct flowi6 *fl6, __u8 *dsfield,
607 int *encap_limit)
608 {
609 const struct iphdr *iph = ip_hdr(skb);
610 struct ip6_tnl *t = netdev_priv(dev);
611
612 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
613 *encap_limit = t->parms.encap_limit;
614
615 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
616
617 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
618 *dsfield = ipv4_get_dsfield(iph);
619 else
620 *dsfield = ip6_tclass(t->parms.flowinfo);
621
622 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
623 fl6->flowi6_mark = skb->mark;
624 else
625 fl6->flowi6_mark = t->parms.fwmark;
626
627 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
628 }
629
prepare_ip6gre_xmit_ipv6(struct sk_buff * skb,struct net_device * dev,struct flowi6 * fl6,__u8 * dsfield,int * encap_limit)630 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
631 struct net_device *dev,
632 struct flowi6 *fl6, __u8 *dsfield,
633 int *encap_limit)
634 {
635 struct ipv6hdr *ipv6h;
636 struct ip6_tnl *t = netdev_priv(dev);
637 __u16 offset;
638
639 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
640 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
641 ipv6h = ipv6_hdr(skb);
642
643 if (offset > 0) {
644 struct ipv6_tlv_tnl_enc_lim *tel;
645
646 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
647 if (tel->encap_limit == 0) {
648 icmpv6_ndo_send(skb, ICMPV6_PARAMPROB,
649 ICMPV6_HDR_FIELD, offset + 2);
650 return -1;
651 }
652 *encap_limit = tel->encap_limit - 1;
653 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
654 *encap_limit = t->parms.encap_limit;
655 }
656
657 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
658
659 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
660 *dsfield = ipv6_get_dsfield(ipv6h);
661 else
662 *dsfield = ip6_tclass(t->parms.flowinfo);
663
664 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
665 fl6->flowlabel |= ip6_flowlabel(ipv6h);
666
667 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
668 fl6->flowi6_mark = skb->mark;
669 else
670 fl6->flowi6_mark = t->parms.fwmark;
671
672 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
673
674 return 0;
675 }
676
prepare_ip6gre_xmit_other(struct sk_buff * skb,struct net_device * dev,struct flowi6 * fl6,__u8 * dsfield,int * encap_limit)677 static int prepare_ip6gre_xmit_other(struct sk_buff *skb,
678 struct net_device *dev,
679 struct flowi6 *fl6, __u8 *dsfield,
680 int *encap_limit)
681 {
682 struct ip6_tnl *t = netdev_priv(dev);
683
684 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
685 *encap_limit = t->parms.encap_limit;
686
687 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
688
689 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
690 *dsfield = 0;
691 else
692 *dsfield = ip6_tclass(t->parms.flowinfo);
693
694 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
695 fl6->flowi6_mark = skb->mark;
696 else
697 fl6->flowi6_mark = t->parms.fwmark;
698
699 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
700
701 return 0;
702 }
703
skb_tunnel_info_txcheck(struct sk_buff * skb)704 static struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb)
705 {
706 struct ip_tunnel_info *tun_info;
707
708 tun_info = skb_tunnel_info(skb);
709 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX)))
710 return ERR_PTR(-EINVAL);
711
712 return tun_info;
713 }
714
__gre6_xmit(struct sk_buff * skb,struct net_device * dev,__u8 dsfield,struct flowi6 * fl6,int encap_limit,__u32 * pmtu,__be16 proto)715 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
716 struct net_device *dev, __u8 dsfield,
717 struct flowi6 *fl6, int encap_limit,
718 __u32 *pmtu, __be16 proto)
719 {
720 struct ip6_tnl *tunnel = netdev_priv(dev);
721 IP_TUNNEL_DECLARE_FLAGS(flags);
722 __be16 protocol;
723
724 if (dev->type == ARPHRD_ETHER)
725 IPCB(skb)->flags = 0;
726
727 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
728 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
729 else
730 fl6->daddr = tunnel->parms.raddr;
731
732 /* Push GRE header. */
733 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
734
735 if (tunnel->parms.collect_md) {
736 struct ip_tunnel_info *tun_info;
737 const struct ip_tunnel_key *key;
738 int tun_hlen;
739
740 tun_info = skb_tunnel_info_txcheck(skb);
741 if (IS_ERR(tun_info) ||
742 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
743 return -EINVAL;
744
745 key = &tun_info->key;
746 memset(fl6, 0, sizeof(*fl6));
747 fl6->flowi6_proto = IPPROTO_GRE;
748 fl6->daddr = key->u.ipv6.dst;
749 fl6->flowlabel = key->label;
750 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
751 fl6->fl6_gre_key = tunnel_id_to_key32(key->tun_id);
752
753 dsfield = key->tos;
754 ip_tunnel_flags_zero(flags);
755 __set_bit(IP_TUNNEL_CSUM_BIT, flags);
756 __set_bit(IP_TUNNEL_KEY_BIT, flags);
757 __set_bit(IP_TUNNEL_SEQ_BIT, flags);
758 ip_tunnel_flags_and(flags, flags, key->tun_flags);
759 tun_hlen = gre_calc_hlen(flags);
760
761 if (skb_cow_head(skb, dev->needed_headroom ?: tun_hlen + tunnel->encap_hlen))
762 return -ENOMEM;
763
764 gre_build_header(skb, tun_hlen,
765 flags, protocol,
766 tunnel_id_to_key32(tun_info->key.tun_id),
767 test_bit(IP_TUNNEL_SEQ_BIT, flags) ?
768 htonl(atomic_fetch_inc(&tunnel->o_seqno)) :
769 0);
770
771 } else {
772 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
773 return -ENOMEM;
774
775 ip_tunnel_flags_copy(flags, tunnel->parms.o_flags);
776
777 gre_build_header(skb, tunnel->tun_hlen, flags,
778 protocol, tunnel->parms.o_key,
779 test_bit(IP_TUNNEL_SEQ_BIT, flags) ?
780 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, test_bit(IP_TUNNEL_CSUM_BIT,
804 t->parms.o_flags));
805 if (err)
806 return -1;
807
808 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
809 skb->protocol);
810 if (err != 0) {
811 /* XXX: send ICMP error even if DF is not set. */
812 if (err == -EMSGSIZE)
813 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
814 htonl(mtu));
815 return -1;
816 }
817
818 return 0;
819 }
820
ip6gre_xmit_ipv6(struct sk_buff * skb,struct net_device * dev)821 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
822 {
823 struct ip6_tnl *t = netdev_priv(dev);
824 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
825 int encap_limit = -1;
826 struct flowi6 fl6;
827 __u8 dsfield = 0;
828 __u32 mtu;
829 int err;
830
831 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
832 return -1;
833
834 if (!t->parms.collect_md &&
835 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
836 return -1;
837
838 if (gre_handle_offloads(skb, test_bit(IP_TUNNEL_CSUM_BIT,
839 t->parms.o_flags)))
840 return -1;
841
842 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
843 &mtu, skb->protocol);
844 if (err != 0) {
845 if (err == -EMSGSIZE)
846 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
847 return -1;
848 }
849
850 return 0;
851 }
852
ip6gre_xmit_other(struct sk_buff * skb,struct net_device * dev)853 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
854 {
855 struct ip6_tnl *t = netdev_priv(dev);
856 int encap_limit = -1;
857 struct flowi6 fl6;
858 __u8 dsfield = 0;
859 __u32 mtu;
860 int err;
861
862 if (!t->parms.collect_md &&
863 prepare_ip6gre_xmit_other(skb, dev, &fl6, &dsfield, &encap_limit))
864 return -1;
865
866 err = gre_handle_offloads(skb, test_bit(IP_TUNNEL_CSUM_BIT,
867 t->parms.o_flags));
868 if (err)
869 return err;
870 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, skb->protocol);
871
872 return err;
873 }
874
ip6gre_tunnel_xmit(struct sk_buff * skb,struct net_device * dev)875 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
876 struct net_device *dev)
877 {
878 struct ip6_tnl *t = netdev_priv(dev);
879 __be16 payload_protocol;
880 int ret;
881
882 if (!pskb_inet_may_pull(skb))
883 goto tx_err;
884
885 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
886 goto tx_err;
887
888 payload_protocol = skb_protocol(skb, true);
889 switch (payload_protocol) {
890 case htons(ETH_P_IP):
891 ret = ip6gre_xmit_ipv4(skb, dev);
892 break;
893 case htons(ETH_P_IPV6):
894 ret = ip6gre_xmit_ipv6(skb, dev);
895 break;
896 default:
897 ret = ip6gre_xmit_other(skb, dev);
898 break;
899 }
900
901 if (ret < 0)
902 goto tx_err;
903
904 return NETDEV_TX_OK;
905
906 tx_err:
907 if (!t->parms.collect_md || !IS_ERR(skb_tunnel_info_txcheck(skb)))
908 DEV_STATS_INC(dev, tx_errors);
909 DEV_STATS_INC(dev, tx_dropped);
910 kfree_skb(skb);
911 return NETDEV_TX_OK;
912 }
913
ip6erspan_tunnel_xmit(struct sk_buff * skb,struct net_device * dev)914 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
915 struct net_device *dev)
916 {
917 struct ip_tunnel_info *tun_info = NULL;
918 struct ip6_tnl *t = netdev_priv(dev);
919 struct dst_entry *dst = skb_dst(skb);
920 IP_TUNNEL_DECLARE_FLAGS(flags) = { };
921 bool truncate = false;
922 int encap_limit = -1;
923 __u8 dsfield = false;
924 struct flowi6 fl6;
925 int err = -EINVAL;
926 __be16 proto;
927 __u32 mtu;
928 int nhoff;
929
930 if (!pskb_inet_may_pull(skb))
931 goto tx_err;
932
933 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
934 goto tx_err;
935
936 if (gre_handle_offloads(skb, false))
937 goto tx_err;
938
939 if (skb->len > dev->mtu + dev->hard_header_len) {
940 if (pskb_trim(skb, dev->mtu + dev->hard_header_len))
941 goto tx_err;
942 truncate = true;
943 }
944
945 nhoff = skb_network_offset(skb);
946 if (skb->protocol == htons(ETH_P_IP) &&
947 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
948 truncate = true;
949
950 if (skb->protocol == htons(ETH_P_IPV6)) {
951 int thoff;
952
953 if (skb_transport_header_was_set(skb))
954 thoff = skb_transport_offset(skb);
955 else
956 thoff = nhoff + sizeof(struct ipv6hdr);
957 if (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)
958 truncate = true;
959 }
960
961 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
962 goto tx_err;
963
964 __clear_bit(IP_TUNNEL_KEY_BIT, t->parms.o_flags);
965 IPCB(skb)->flags = 0;
966
967 /* For collect_md mode, derive fl6 from the tunnel key,
968 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
969 */
970 if (t->parms.collect_md) {
971 const struct ip_tunnel_key *key;
972 struct erspan_metadata *md;
973 __be32 tun_id;
974
975 tun_info = skb_tunnel_info_txcheck(skb);
976 if (IS_ERR(tun_info) ||
977 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
978 goto tx_err;
979
980 key = &tun_info->key;
981 memset(&fl6, 0, sizeof(fl6));
982 fl6.flowi6_proto = IPPROTO_GRE;
983 fl6.daddr = key->u.ipv6.dst;
984 fl6.flowlabel = key->label;
985 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
986 fl6.fl6_gre_key = tunnel_id_to_key32(key->tun_id);
987
988 dsfield = key->tos;
989 if (!test_bit(IP_TUNNEL_ERSPAN_OPT_BIT,
990 tun_info->key.tun_flags))
991 goto tx_err;
992 if (tun_info->options_len < sizeof(*md))
993 goto tx_err;
994 md = ip_tunnel_info_opts(tun_info);
995
996 tun_id = tunnel_id_to_key32(key->tun_id);
997 if (md->version == 1) {
998 erspan_build_header(skb,
999 ntohl(tun_id),
1000 ntohl(md->u.index), truncate,
1001 false);
1002 proto = htons(ETH_P_ERSPAN);
1003 } else if (md->version == 2) {
1004 erspan_build_header_v2(skb,
1005 ntohl(tun_id),
1006 md->u.md2.dir,
1007 get_hwid(&md->u.md2),
1008 truncate, false);
1009 proto = htons(ETH_P_ERSPAN2);
1010 } else {
1011 goto tx_err;
1012 }
1013 } else {
1014 switch (skb->protocol) {
1015 case htons(ETH_P_IP):
1016 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1017 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1018 &dsfield, &encap_limit);
1019 break;
1020 case htons(ETH_P_IPV6):
1021 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1022 goto tx_err;
1023 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1024 &dsfield, &encap_limit))
1025 goto tx_err;
1026 break;
1027 default:
1028 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1029 break;
1030 }
1031
1032 if (t->parms.erspan_ver == 1) {
1033 erspan_build_header(skb, ntohl(t->parms.o_key),
1034 t->parms.index,
1035 truncate, false);
1036 proto = htons(ETH_P_ERSPAN);
1037 } else if (t->parms.erspan_ver == 2) {
1038 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1039 t->parms.dir,
1040 t->parms.hwid,
1041 truncate, false);
1042 proto = htons(ETH_P_ERSPAN2);
1043 } else {
1044 goto tx_err;
1045 }
1046
1047 fl6.daddr = t->parms.raddr;
1048 }
1049
1050 /* Push GRE header. */
1051 __set_bit(IP_TUNNEL_SEQ_BIT, flags);
1052 gre_build_header(skb, 8, flags, proto, 0,
1053 htonl(atomic_fetch_inc(&t->o_seqno)));
1054
1055 /* TooBig packet may have updated dst->dev's mtu */
1056 if (!t->parms.collect_md && dst) {
1057 mtu = READ_ONCE(dst_dev(dst)->mtu);
1058 if (dst_mtu(dst) > mtu)
1059 dst->ops->update_pmtu(dst, NULL, skb, mtu, false);
1060 }
1061 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1062 NEXTHDR_GRE);
1063 if (err != 0) {
1064 /* XXX: send ICMP error even if DF is not set. */
1065 if (err == -EMSGSIZE) {
1066 if (skb->protocol == htons(ETH_P_IP))
1067 icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1068 ICMP_FRAG_NEEDED, htonl(mtu));
1069 else
1070 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1071 }
1072
1073 goto tx_err;
1074 }
1075 return NETDEV_TX_OK;
1076
1077 tx_err:
1078 if (!IS_ERR(tun_info))
1079 DEV_STATS_INC(dev, tx_errors);
1080 DEV_STATS_INC(dev, tx_dropped);
1081 kfree_skb(skb);
1082 return NETDEV_TX_OK;
1083 }
1084
ip6gre_tnl_link_config_common(struct ip6_tnl * t)1085 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1086 {
1087 struct net_device *dev = t->dev;
1088 struct __ip6_tnl_parm *p = &t->parms;
1089 struct flowi6 *fl6 = &t->fl.u.ip6;
1090
1091 if (dev->type != ARPHRD_ETHER) {
1092 __dev_addr_set(dev, &p->laddr, sizeof(struct in6_addr));
1093 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1094 }
1095
1096 /* Set up flowi template */
1097 fl6->saddr = p->laddr;
1098 fl6->daddr = p->raddr;
1099 fl6->flowi6_oif = p->link;
1100 fl6->flowlabel = 0;
1101 fl6->flowi6_proto = IPPROTO_GRE;
1102 fl6->fl6_gre_key = t->parms.o_key;
1103
1104 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1105 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1106 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1107 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1108
1109 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1110 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1111
1112 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1113 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1114 dev->flags |= IFF_POINTOPOINT;
1115 else
1116 dev->flags &= ~IFF_POINTOPOINT;
1117 }
1118
ip6gre_tnl_link_config_route(struct ip6_tnl * t,int set_mtu,int t_hlen)1119 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1120 int t_hlen)
1121 {
1122 const struct __ip6_tnl_parm *p = &t->parms;
1123 struct net_device *dev = t->dev;
1124
1125 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1126 int strict = (ipv6_addr_type(&p->raddr) &
1127 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1128
1129 struct rt6_info *rt = rt6_lookup(t->net,
1130 &p->raddr, &p->laddr,
1131 p->link, NULL, strict);
1132
1133 if (!rt)
1134 return;
1135
1136 if (rt->dst.dev) {
1137 unsigned short dst_len = rt->dst.dev->hard_header_len +
1138 t_hlen;
1139
1140 if (t->dev->header_ops)
1141 dev->hard_header_len = dst_len;
1142 else
1143 dev->needed_headroom = dst_len;
1144
1145 if (set_mtu) {
1146 int mtu = rt->dst.dev->mtu - t_hlen;
1147
1148 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1149 mtu -= 8;
1150 if (dev->type == ARPHRD_ETHER)
1151 mtu -= ETH_HLEN;
1152
1153 if (mtu < IPV6_MIN_MTU)
1154 mtu = IPV6_MIN_MTU;
1155 WRITE_ONCE(dev->mtu, mtu);
1156 }
1157 }
1158 ip6_rt_put(rt);
1159 }
1160 }
1161
ip6gre_calc_hlen(struct ip6_tnl * tunnel)1162 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1163 {
1164 int t_hlen;
1165
1166 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1167 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1168
1169 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1170
1171 if (tunnel->dev->header_ops)
1172 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1173 else
1174 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1175
1176 return t_hlen;
1177 }
1178
ip6gre_tnl_link_config(struct ip6_tnl * t,int set_mtu)1179 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1180 {
1181 ip6gre_tnl_link_config_common(t);
1182 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1183 }
1184
ip6gre_tnl_copy_tnl_parm(struct ip6_tnl * t,const struct __ip6_tnl_parm * p)1185 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1186 const struct __ip6_tnl_parm *p)
1187 {
1188 t->parms.laddr = p->laddr;
1189 t->parms.raddr = p->raddr;
1190 t->parms.flags = p->flags;
1191 t->parms.hop_limit = p->hop_limit;
1192 t->parms.encap_limit = p->encap_limit;
1193 t->parms.flowinfo = p->flowinfo;
1194 t->parms.link = p->link;
1195 t->parms.proto = p->proto;
1196 t->parms.i_key = p->i_key;
1197 t->parms.o_key = p->o_key;
1198 ip_tunnel_flags_copy(t->parms.i_flags, p->i_flags);
1199 ip_tunnel_flags_copy(t->parms.o_flags, p->o_flags);
1200 t->parms.fwmark = p->fwmark;
1201 t->parms.erspan_ver = p->erspan_ver;
1202 t->parms.index = p->index;
1203 t->parms.dir = p->dir;
1204 t->parms.hwid = p->hwid;
1205 dst_cache_reset(&t->dst_cache);
1206 }
1207
ip6gre_tnl_change(struct ip6_tnl * t,const struct __ip6_tnl_parm * p,int set_mtu)1208 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1209 int set_mtu)
1210 {
1211 ip6gre_tnl_copy_tnl_parm(t, p);
1212 ip6gre_tnl_link_config(t, set_mtu);
1213 return 0;
1214 }
1215
ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm * p,const struct ip6_tnl_parm2 * u)1216 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1217 const struct ip6_tnl_parm2 *u)
1218 {
1219 p->laddr = u->laddr;
1220 p->raddr = u->raddr;
1221 p->flags = u->flags;
1222 p->hop_limit = u->hop_limit;
1223 p->encap_limit = u->encap_limit;
1224 p->flowinfo = u->flowinfo;
1225 p->link = u->link;
1226 p->i_key = u->i_key;
1227 p->o_key = u->o_key;
1228 gre_flags_to_tnl_flags(p->i_flags, u->i_flags);
1229 gre_flags_to_tnl_flags(p->o_flags, u->o_flags);
1230 memcpy(p->name, u->name, sizeof(u->name));
1231 }
1232
ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 * u,const struct __ip6_tnl_parm * p)1233 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1234 const struct __ip6_tnl_parm *p)
1235 {
1236 u->proto = IPPROTO_GRE;
1237 u->laddr = p->laddr;
1238 u->raddr = p->raddr;
1239 u->flags = p->flags;
1240 u->hop_limit = p->hop_limit;
1241 u->encap_limit = p->encap_limit;
1242 u->flowinfo = p->flowinfo;
1243 u->link = p->link;
1244 u->i_key = p->i_key;
1245 u->o_key = p->o_key;
1246 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1247 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1248 memcpy(u->name, p->name, sizeof(u->name));
1249 }
1250
ip6gre_tunnel_siocdevprivate(struct net_device * dev,struct ifreq * ifr,void __user * data,int cmd)1251 static int ip6gre_tunnel_siocdevprivate(struct net_device *dev,
1252 struct ifreq *ifr, void __user *data,
1253 int cmd)
1254 {
1255 int err = 0;
1256 struct ip6_tnl_parm2 p;
1257 struct __ip6_tnl_parm p1;
1258 struct ip6_tnl *t = netdev_priv(dev);
1259 struct net *net = t->net;
1260 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1261
1262 memset(&p1, 0, sizeof(p1));
1263
1264 switch (cmd) {
1265 case SIOCGETTUNNEL:
1266 if (dev == ign->fb_tunnel_dev) {
1267 if (copy_from_user(&p, data, sizeof(p))) {
1268 err = -EFAULT;
1269 break;
1270 }
1271 ip6gre_tnl_parm_from_user(&p1, &p);
1272 t = ip6gre_tunnel_locate(net, &p1, 0);
1273 if (!t)
1274 t = netdev_priv(dev);
1275 }
1276 memset(&p, 0, sizeof(p));
1277 ip6gre_tnl_parm_to_user(&p, &t->parms);
1278 if (copy_to_user(data, &p, sizeof(p)))
1279 err = -EFAULT;
1280 break;
1281
1282 case SIOCADDTUNNEL:
1283 case SIOCCHGTUNNEL:
1284 err = -EPERM;
1285 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1286 goto done;
1287
1288 err = -EFAULT;
1289 if (copy_from_user(&p, data, sizeof(p)))
1290 goto done;
1291
1292 err = -EINVAL;
1293 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1294 goto done;
1295
1296 if (!(p.i_flags&GRE_KEY))
1297 p.i_key = 0;
1298 if (!(p.o_flags&GRE_KEY))
1299 p.o_key = 0;
1300
1301 ip6gre_tnl_parm_from_user(&p1, &p);
1302 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1303
1304 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1305 if (t) {
1306 if (t->dev != dev) {
1307 err = -EEXIST;
1308 break;
1309 }
1310 } else {
1311 t = netdev_priv(dev);
1312
1313 ip6gre_tunnel_unlink(ign, t);
1314 synchronize_net();
1315 ip6gre_tnl_change(t, &p1, 1);
1316 ip6gre_tunnel_link(ign, t);
1317 netdev_state_change(dev);
1318 }
1319 }
1320
1321 if (t) {
1322 err = 0;
1323
1324 memset(&p, 0, sizeof(p));
1325 ip6gre_tnl_parm_to_user(&p, &t->parms);
1326 if (copy_to_user(data, &p, sizeof(p)))
1327 err = -EFAULT;
1328 } else
1329 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1330 break;
1331
1332 case SIOCDELTUNNEL:
1333 err = -EPERM;
1334 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1335 goto done;
1336
1337 if (dev == ign->fb_tunnel_dev) {
1338 err = -EFAULT;
1339 if (copy_from_user(&p, data, sizeof(p)))
1340 goto done;
1341 err = -ENOENT;
1342 ip6gre_tnl_parm_from_user(&p1, &p);
1343 t = ip6gre_tunnel_locate(net, &p1, 0);
1344 if (!t)
1345 goto done;
1346 err = -EPERM;
1347 if (t == netdev_priv(ign->fb_tunnel_dev))
1348 goto done;
1349 dev = t->dev;
1350 }
1351 unregister_netdevice(dev);
1352 err = 0;
1353 break;
1354
1355 default:
1356 err = -EINVAL;
1357 }
1358
1359 done:
1360 return err;
1361 }
1362
ip6gre_header(struct sk_buff * skb,struct net_device * dev,unsigned short type,const void * daddr,const void * saddr,unsigned int len)1363 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1364 unsigned short type, const void *daddr,
1365 const void *saddr, unsigned int len)
1366 {
1367 struct ip6_tnl *t = netdev_priv(dev);
1368 struct ipv6hdr *ipv6h;
1369 __be16 *p;
1370
1371 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1372 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1373 t->fl.u.ip6.flowlabel,
1374 true, &t->fl.u.ip6));
1375 ipv6h->hop_limit = t->parms.hop_limit;
1376 ipv6h->nexthdr = NEXTHDR_GRE;
1377 ipv6h->saddr = t->parms.laddr;
1378 ipv6h->daddr = t->parms.raddr;
1379
1380 p = (__be16 *)(ipv6h + 1);
1381 p[0] = ip_tunnel_flags_to_be16(t->parms.o_flags);
1382 p[1] = htons(type);
1383
1384 /*
1385 * Set the source hardware address.
1386 */
1387
1388 if (saddr)
1389 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1390 if (daddr)
1391 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1392 if (!ipv6_addr_any(&ipv6h->daddr))
1393 return t->hlen;
1394
1395 return -t->hlen;
1396 }
1397
1398 static const struct header_ops ip6gre_header_ops = {
1399 .create = ip6gre_header,
1400 };
1401
1402 static const struct net_device_ops ip6gre_netdev_ops = {
1403 .ndo_init = ip6gre_tunnel_init,
1404 .ndo_uninit = ip6gre_tunnel_uninit,
1405 .ndo_start_xmit = ip6gre_tunnel_xmit,
1406 .ndo_siocdevprivate = ip6gre_tunnel_siocdevprivate,
1407 .ndo_change_mtu = ip6_tnl_change_mtu,
1408 .ndo_get_iflink = ip6_tnl_get_iflink,
1409 };
1410
ip6gre_dev_free(struct net_device * dev)1411 static void ip6gre_dev_free(struct net_device *dev)
1412 {
1413 struct ip6_tnl *t = netdev_priv(dev);
1414
1415 gro_cells_destroy(&t->gro_cells);
1416 dst_cache_destroy(&t->dst_cache);
1417 }
1418
ip6gre_tunnel_setup(struct net_device * dev)1419 static void ip6gre_tunnel_setup(struct net_device *dev)
1420 {
1421 dev->netdev_ops = &ip6gre_netdev_ops;
1422 dev->needs_free_netdev = true;
1423 dev->priv_destructor = ip6gre_dev_free;
1424
1425 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
1426 dev->type = ARPHRD_IP6GRE;
1427
1428 dev->flags |= IFF_NOARP;
1429 dev->addr_len = sizeof(struct in6_addr);
1430 netif_keep_dst(dev);
1431 /* This perm addr will be used as interface identifier by IPv6 */
1432 dev->addr_assign_type = NET_ADDR_RANDOM;
1433 eth_random_addr(dev->perm_addr);
1434 }
1435
1436 #define GRE6_FEATURES (NETIF_F_SG | \
1437 NETIF_F_FRAGLIST | \
1438 NETIF_F_HIGHDMA | \
1439 NETIF_F_HW_CSUM)
1440
ip6gre_tnl_init_features(struct net_device * dev)1441 static void ip6gre_tnl_init_features(struct net_device *dev)
1442 {
1443 struct ip6_tnl *nt = netdev_priv(dev);
1444
1445 dev->features |= GRE6_FEATURES;
1446 dev->hw_features |= GRE6_FEATURES;
1447
1448 /* TCP offload with GRE SEQ is not supported, nor can we support 2
1449 * levels of outer headers requiring an update.
1450 */
1451 if (test_bit(IP_TUNNEL_SEQ_BIT, nt->parms.o_flags))
1452 return;
1453 if (test_bit(IP_TUNNEL_CSUM_BIT, nt->parms.o_flags) &&
1454 nt->encap.type != TUNNEL_ENCAP_NONE)
1455 return;
1456
1457 dev->features |= NETIF_F_GSO_SOFTWARE;
1458 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1459
1460 dev->lltx = true;
1461 }
1462
ip6gre_tunnel_init_common(struct net_device * dev)1463 static int ip6gre_tunnel_init_common(struct net_device *dev)
1464 {
1465 struct ip6_tnl *tunnel;
1466 int ret;
1467 int t_hlen;
1468
1469 tunnel = netdev_priv(dev);
1470
1471 tunnel->dev = dev;
1472 strcpy(tunnel->parms.name, dev->name);
1473
1474 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1475 if (ret)
1476 return ret;
1477
1478 ret = gro_cells_init(&tunnel->gro_cells, dev);
1479 if (ret)
1480 goto cleanup_dst_cache_init;
1481
1482 t_hlen = ip6gre_calc_hlen(tunnel);
1483 dev->mtu = ETH_DATA_LEN - t_hlen;
1484 if (dev->type == ARPHRD_ETHER)
1485 dev->mtu -= ETH_HLEN;
1486 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1487 dev->mtu -= 8;
1488
1489 if (tunnel->parms.collect_md) {
1490 netif_keep_dst(dev);
1491 }
1492 ip6gre_tnl_init_features(dev);
1493
1494 netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
1495 netdev_lockdep_set_classes(dev);
1496 return 0;
1497
1498 cleanup_dst_cache_init:
1499 dst_cache_destroy(&tunnel->dst_cache);
1500 return ret;
1501 }
1502
ip6gre_tunnel_init(struct net_device * dev)1503 static int ip6gre_tunnel_init(struct net_device *dev)
1504 {
1505 struct ip6_tnl *tunnel;
1506 int ret;
1507
1508 ret = ip6gre_tunnel_init_common(dev);
1509 if (ret)
1510 return ret;
1511
1512 tunnel = netdev_priv(dev);
1513
1514 if (tunnel->parms.collect_md)
1515 return 0;
1516
1517 __dev_addr_set(dev, &tunnel->parms.laddr, sizeof(struct in6_addr));
1518 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1519
1520 if (ipv6_addr_any(&tunnel->parms.raddr))
1521 dev->header_ops = &ip6gre_header_ops;
1522
1523 return 0;
1524 }
1525
ip6gre_fb_tunnel_init(struct net_device * dev)1526 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1527 {
1528 struct ip6_tnl *tunnel = netdev_priv(dev);
1529
1530 tunnel->dev = dev;
1531 tunnel->net = dev_net(dev);
1532 strcpy(tunnel->parms.name, dev->name);
1533
1534 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1535 }
1536
1537 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1538 .handler = gre_rcv,
1539 .err_handler = ip6gre_err,
1540 .flags = INET6_PROTO_FINAL,
1541 };
1542
ip6gre_exit_rtnl_net(struct net * net,struct list_head * head)1543 static void __net_exit ip6gre_exit_rtnl_net(struct net *net, struct list_head *head)
1544 {
1545 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1546 struct net_device *dev, *aux;
1547 int prio;
1548
1549 for_each_netdev_safe(net, dev, aux)
1550 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1551 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1552 dev->rtnl_link_ops == &ip6erspan_tap_ops)
1553 unregister_netdevice_queue(dev, head);
1554
1555 for (prio = 0; prio < 4; prio++) {
1556 int h;
1557 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1558 struct ip6_tnl *t;
1559
1560 t = rtnl_net_dereference(net, ign->tunnels[prio][h]);
1561
1562 while (t) {
1563 /* If dev is in the same netns, it has already
1564 * been added to the list by the previous loop.
1565 */
1566 if (!net_eq(dev_net(t->dev), net))
1567 unregister_netdevice_queue(t->dev, head);
1568
1569 t = rtnl_net_dereference(net, t->next);
1570 }
1571 }
1572 }
1573 }
1574
ip6gre_init_net(struct net * net)1575 static int __net_init ip6gre_init_net(struct net *net)
1576 {
1577 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1578 struct net_device *ndev;
1579 int err;
1580
1581 if (!net_has_fallback_tunnels(net))
1582 return 0;
1583 ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1584 NET_NAME_UNKNOWN, ip6gre_tunnel_setup);
1585 if (!ndev) {
1586 err = -ENOMEM;
1587 goto err_alloc_dev;
1588 }
1589 ign->fb_tunnel_dev = ndev;
1590 dev_net_set(ign->fb_tunnel_dev, net);
1591 /* FB netdevice is special: we have one, and only one per netns.
1592 * Allowing to move it to another netns is clearly unsafe.
1593 */
1594 ign->fb_tunnel_dev->netns_immutable = true;
1595
1596 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1597 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1598
1599 err = register_netdev(ign->fb_tunnel_dev);
1600 if (err)
1601 goto err_reg_dev;
1602
1603 rcu_assign_pointer(ign->tunnels_wc[0],
1604 netdev_priv(ign->fb_tunnel_dev));
1605 return 0;
1606
1607 err_reg_dev:
1608 free_netdev(ndev);
1609 err_alloc_dev:
1610 return err;
1611 }
1612
1613 static struct pernet_operations ip6gre_net_ops = {
1614 .init = ip6gre_init_net,
1615 .exit_rtnl = ip6gre_exit_rtnl_net,
1616 .id = &ip6gre_net_id,
1617 .size = sizeof(struct ip6gre_net),
1618 };
1619
ip6gre_tunnel_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1620 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1621 struct netlink_ext_ack *extack)
1622 {
1623 __be16 flags;
1624
1625 if (!data)
1626 return 0;
1627
1628 flags = 0;
1629 if (data[IFLA_GRE_IFLAGS])
1630 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1631 if (data[IFLA_GRE_OFLAGS])
1632 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1633 if (flags & (GRE_VERSION|GRE_ROUTING))
1634 return -EINVAL;
1635
1636 return 0;
1637 }
1638
ip6gre_tap_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1639 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1640 struct netlink_ext_ack *extack)
1641 {
1642 struct in6_addr daddr;
1643
1644 if (tb[IFLA_ADDRESS]) {
1645 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1646 return -EINVAL;
1647 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1648 return -EADDRNOTAVAIL;
1649 }
1650
1651 if (!data)
1652 goto out;
1653
1654 if (data[IFLA_GRE_REMOTE]) {
1655 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1656 if (ipv6_addr_any(&daddr))
1657 return -EINVAL;
1658 }
1659
1660 out:
1661 return ip6gre_tunnel_validate(tb, data, extack);
1662 }
1663
ip6erspan_tap_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1664 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1665 struct netlink_ext_ack *extack)
1666 {
1667 __be16 flags = 0;
1668 int ret, ver = 0;
1669
1670 if (!data)
1671 return 0;
1672
1673 ret = ip6gre_tap_validate(tb, data, extack);
1674 if (ret)
1675 return ret;
1676
1677 /* ERSPAN should only have GRE sequence and key flag */
1678 if (data[IFLA_GRE_OFLAGS])
1679 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1680 if (data[IFLA_GRE_IFLAGS])
1681 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1682 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1683 flags != (GRE_SEQ | GRE_KEY))
1684 return -EINVAL;
1685
1686 /* ERSPAN Session ID only has 10-bit. Since we reuse
1687 * 32-bit key field as ID, check it's range.
1688 */
1689 if (data[IFLA_GRE_IKEY] &&
1690 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1691 return -EINVAL;
1692
1693 if (data[IFLA_GRE_OKEY] &&
1694 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1695 return -EINVAL;
1696
1697 if (data[IFLA_GRE_ERSPAN_VER]) {
1698 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1699 if (ver != 1 && ver != 2)
1700 return -EINVAL;
1701 }
1702
1703 if (ver == 1) {
1704 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1705 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1706
1707 if (index & ~INDEX_MASK)
1708 return -EINVAL;
1709 }
1710 } else if (ver == 2) {
1711 if (data[IFLA_GRE_ERSPAN_DIR]) {
1712 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1713
1714 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1715 return -EINVAL;
1716 }
1717
1718 if (data[IFLA_GRE_ERSPAN_HWID]) {
1719 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1720
1721 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1722 return -EINVAL;
1723 }
1724 }
1725
1726 return 0;
1727 }
1728
ip6erspan_set_version(struct nlattr * data[],struct __ip6_tnl_parm * parms)1729 static void ip6erspan_set_version(struct nlattr *data[],
1730 struct __ip6_tnl_parm *parms)
1731 {
1732 if (!data)
1733 return;
1734
1735 parms->erspan_ver = 1;
1736 if (data[IFLA_GRE_ERSPAN_VER])
1737 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1738
1739 if (parms->erspan_ver == 1) {
1740 if (data[IFLA_GRE_ERSPAN_INDEX])
1741 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1742 } else if (parms->erspan_ver == 2) {
1743 if (data[IFLA_GRE_ERSPAN_DIR])
1744 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1745 if (data[IFLA_GRE_ERSPAN_HWID])
1746 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1747 }
1748 }
1749
ip6gre_netlink_parms(struct nlattr * data[],struct __ip6_tnl_parm * parms)1750 static void ip6gre_netlink_parms(struct nlattr *data[],
1751 struct __ip6_tnl_parm *parms)
1752 {
1753 memset(parms, 0, sizeof(*parms));
1754
1755 if (!data)
1756 return;
1757
1758 if (data[IFLA_GRE_LINK])
1759 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1760
1761 if (data[IFLA_GRE_IFLAGS])
1762 gre_flags_to_tnl_flags(parms->i_flags,
1763 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1764
1765 if (data[IFLA_GRE_OFLAGS])
1766 gre_flags_to_tnl_flags(parms->o_flags,
1767 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1768
1769 if (data[IFLA_GRE_IKEY])
1770 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1771
1772 if (data[IFLA_GRE_OKEY])
1773 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1774
1775 if (data[IFLA_GRE_LOCAL])
1776 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1777
1778 if (data[IFLA_GRE_REMOTE])
1779 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1780
1781 if (data[IFLA_GRE_TTL])
1782 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1783
1784 if (data[IFLA_GRE_ENCAP_LIMIT])
1785 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1786
1787 if (data[IFLA_GRE_FLOWINFO])
1788 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1789
1790 if (data[IFLA_GRE_FLAGS])
1791 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1792
1793 if (data[IFLA_GRE_FWMARK])
1794 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1795
1796 if (data[IFLA_GRE_COLLECT_METADATA])
1797 parms->collect_md = true;
1798 }
1799
ip6gre_tap_init(struct net_device * dev)1800 static int ip6gre_tap_init(struct net_device *dev)
1801 {
1802 int ret;
1803
1804 ret = ip6gre_tunnel_init_common(dev);
1805 if (ret)
1806 return ret;
1807
1808 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1809
1810 return 0;
1811 }
1812
1813 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1814 .ndo_init = ip6gre_tap_init,
1815 .ndo_uninit = ip6gre_tunnel_uninit,
1816 .ndo_start_xmit = ip6gre_tunnel_xmit,
1817 .ndo_set_mac_address = eth_mac_addr,
1818 .ndo_validate_addr = eth_validate_addr,
1819 .ndo_change_mtu = ip6_tnl_change_mtu,
1820 .ndo_get_iflink = ip6_tnl_get_iflink,
1821 };
1822
ip6erspan_calc_hlen(struct ip6_tnl * tunnel)1823 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1824 {
1825 int t_hlen;
1826
1827 tunnel->tun_hlen = 8;
1828 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1829 erspan_hdr_len(tunnel->parms.erspan_ver);
1830
1831 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1832 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1833 return t_hlen;
1834 }
1835
ip6erspan_tap_init(struct net_device * dev)1836 static int ip6erspan_tap_init(struct net_device *dev)
1837 {
1838 struct ip6_tnl *tunnel;
1839 int t_hlen;
1840 int ret;
1841
1842 tunnel = netdev_priv(dev);
1843
1844 tunnel->dev = dev;
1845 strcpy(tunnel->parms.name, dev->name);
1846
1847 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1848 if (ret)
1849 return ret;
1850
1851 ret = gro_cells_init(&tunnel->gro_cells, dev);
1852 if (ret)
1853 goto cleanup_dst_cache_init;
1854
1855 t_hlen = ip6erspan_calc_hlen(tunnel);
1856 dev->mtu = ETH_DATA_LEN - t_hlen;
1857 if (dev->type == ARPHRD_ETHER)
1858 dev->mtu -= ETH_HLEN;
1859 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1860 dev->mtu -= 8;
1861
1862 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1863 ip6erspan_tnl_link_config(tunnel, 1);
1864
1865 netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
1866 netdev_lockdep_set_classes(dev);
1867 return 0;
1868
1869 cleanup_dst_cache_init:
1870 dst_cache_destroy(&tunnel->dst_cache);
1871 return ret;
1872 }
1873
1874 static const struct net_device_ops ip6erspan_netdev_ops = {
1875 .ndo_init = ip6erspan_tap_init,
1876 .ndo_uninit = ip6erspan_tunnel_uninit,
1877 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1878 .ndo_set_mac_address = eth_mac_addr,
1879 .ndo_validate_addr = eth_validate_addr,
1880 .ndo_change_mtu = ip6_tnl_change_mtu,
1881 .ndo_get_iflink = ip6_tnl_get_iflink,
1882 };
1883
ip6gre_tap_setup(struct net_device * dev)1884 static void ip6gre_tap_setup(struct net_device *dev)
1885 {
1886
1887 ether_setup(dev);
1888
1889 dev->max_mtu = 0;
1890 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1891 dev->needs_free_netdev = true;
1892 dev->priv_destructor = ip6gre_dev_free;
1893
1894 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
1895 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1896 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1897 netif_keep_dst(dev);
1898 }
1899
ip6gre_netlink_encap_parms(struct nlattr * data[],struct ip_tunnel_encap * ipencap)1900 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1901 struct ip_tunnel_encap *ipencap)
1902 {
1903 bool ret = false;
1904
1905 memset(ipencap, 0, sizeof(*ipencap));
1906
1907 if (!data)
1908 return ret;
1909
1910 if (data[IFLA_GRE_ENCAP_TYPE]) {
1911 ret = true;
1912 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1913 }
1914
1915 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1916 ret = true;
1917 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1918 }
1919
1920 if (data[IFLA_GRE_ENCAP_SPORT]) {
1921 ret = true;
1922 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1923 }
1924
1925 if (data[IFLA_GRE_ENCAP_DPORT]) {
1926 ret = true;
1927 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1928 }
1929
1930 return ret;
1931 }
1932
ip6gre_newlink_common(struct net * link_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1933 static int ip6gre_newlink_common(struct net *link_net, struct net_device *dev,
1934 struct nlattr *tb[], struct nlattr *data[],
1935 struct netlink_ext_ack *extack)
1936 {
1937 struct ip6_tnl *nt;
1938 struct ip_tunnel_encap ipencap;
1939 int err;
1940
1941 nt = netdev_priv(dev);
1942
1943 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1944 int err = ip6_tnl_encap_setup(nt, &ipencap);
1945
1946 if (err < 0)
1947 return err;
1948 }
1949
1950 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1951 eth_hw_addr_random(dev);
1952
1953 nt->dev = dev;
1954 nt->net = link_net;
1955
1956 err = register_netdevice(dev);
1957 if (err)
1958 goto out;
1959
1960 if (tb[IFLA_MTU])
1961 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1962
1963 out:
1964 return err;
1965 }
1966
ip6gre_newlink(struct net_device * dev,struct rtnl_newlink_params * params,struct netlink_ext_ack * extack)1967 static int ip6gre_newlink(struct net_device *dev,
1968 struct rtnl_newlink_params *params,
1969 struct netlink_ext_ack *extack)
1970 {
1971 struct net *net = params->link_net ? : dev_net(dev);
1972 struct ip6_tnl *nt = netdev_priv(dev);
1973 struct nlattr **data = params->data;
1974 struct nlattr **tb = params->tb;
1975 struct ip6gre_net *ign;
1976 int err;
1977
1978 ip6gre_netlink_parms(data, &nt->parms);
1979 ign = net_generic(net, ip6gre_net_id);
1980
1981 if (nt->parms.collect_md) {
1982 if (rtnl_dereference(ign->collect_md_tun))
1983 return -EEXIST;
1984 } else {
1985 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1986 return -EEXIST;
1987 }
1988
1989 err = ip6gre_newlink_common(net, dev, tb, data, extack);
1990 if (!err) {
1991 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1992 ip6gre_tunnel_link_md(ign, nt);
1993 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
1994 }
1995 return err;
1996 }
1997
1998 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)1999 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2000 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2001 struct netlink_ext_ack *extack)
2002 {
2003 struct ip6_tnl *t, *nt = netdev_priv(dev);
2004 struct net *net = nt->net;
2005 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2006 struct ip_tunnel_encap ipencap;
2007
2008 if (dev == ign->fb_tunnel_dev)
2009 return ERR_PTR(-EINVAL);
2010
2011 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2012 int err = ip6_tnl_encap_setup(nt, &ipencap);
2013
2014 if (err < 0)
2015 return ERR_PTR(err);
2016 }
2017
2018 ip6gre_netlink_parms(data, p_p);
2019
2020 t = ip6gre_tunnel_locate(net, p_p, 0);
2021
2022 if (t) {
2023 if (t->dev != dev)
2024 return ERR_PTR(-EEXIST);
2025 } else {
2026 t = nt;
2027 }
2028
2029 return t;
2030 }
2031
ip6gre_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2032 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2033 struct nlattr *data[],
2034 struct netlink_ext_ack *extack)
2035 {
2036 struct ip6_tnl *t = netdev_priv(dev);
2037 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2038 struct __ip6_tnl_parm p;
2039
2040 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2041 if (IS_ERR(t))
2042 return PTR_ERR(t);
2043
2044 ip6gre_tunnel_unlink_md(ign, t);
2045 ip6gre_tunnel_unlink(ign, t);
2046 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2047 ip6gre_tunnel_link_md(ign, t);
2048 ip6gre_tunnel_link(ign, t);
2049 return 0;
2050 }
2051
ip6gre_dellink(struct net_device * dev,struct list_head * head)2052 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2053 {
2054 struct net *net = dev_net(dev);
2055 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2056
2057 if (dev != ign->fb_tunnel_dev)
2058 unregister_netdevice_queue(dev, head);
2059 }
2060
ip6gre_get_size(const struct net_device * dev)2061 static size_t ip6gre_get_size(const struct net_device *dev)
2062 {
2063 return
2064 /* IFLA_GRE_LINK */
2065 nla_total_size(4) +
2066 /* IFLA_GRE_IFLAGS */
2067 nla_total_size(2) +
2068 /* IFLA_GRE_OFLAGS */
2069 nla_total_size(2) +
2070 /* IFLA_GRE_IKEY */
2071 nla_total_size(4) +
2072 /* IFLA_GRE_OKEY */
2073 nla_total_size(4) +
2074 /* IFLA_GRE_LOCAL */
2075 nla_total_size(sizeof(struct in6_addr)) +
2076 /* IFLA_GRE_REMOTE */
2077 nla_total_size(sizeof(struct in6_addr)) +
2078 /* IFLA_GRE_TTL */
2079 nla_total_size(1) +
2080 /* IFLA_GRE_ENCAP_LIMIT */
2081 nla_total_size(1) +
2082 /* IFLA_GRE_FLOWINFO */
2083 nla_total_size(4) +
2084 /* IFLA_GRE_FLAGS */
2085 nla_total_size(4) +
2086 /* IFLA_GRE_ENCAP_TYPE */
2087 nla_total_size(2) +
2088 /* IFLA_GRE_ENCAP_FLAGS */
2089 nla_total_size(2) +
2090 /* IFLA_GRE_ENCAP_SPORT */
2091 nla_total_size(2) +
2092 /* IFLA_GRE_ENCAP_DPORT */
2093 nla_total_size(2) +
2094 /* IFLA_GRE_COLLECT_METADATA */
2095 nla_total_size(0) +
2096 /* IFLA_GRE_FWMARK */
2097 nla_total_size(4) +
2098 /* IFLA_GRE_ERSPAN_INDEX */
2099 nla_total_size(4) +
2100 0;
2101 }
2102
ip6gre_fill_info(struct sk_buff * skb,const struct net_device * dev)2103 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2104 {
2105 struct ip6_tnl *t = netdev_priv(dev);
2106 struct __ip6_tnl_parm *p = &t->parms;
2107 IP_TUNNEL_DECLARE_FLAGS(o_flags);
2108
2109 ip_tunnel_flags_copy(o_flags, p->o_flags);
2110
2111 if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2112 if (!p->collect_md)
2113 __set_bit(IP_TUNNEL_KEY_BIT, o_flags);
2114
2115 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2116 goto nla_put_failure;
2117
2118 if (p->erspan_ver == 1) {
2119 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2120 goto nla_put_failure;
2121 } else {
2122 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2123 goto nla_put_failure;
2124 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2125 goto nla_put_failure;
2126 }
2127 }
2128
2129 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2130 nla_put_be16(skb, IFLA_GRE_IFLAGS,
2131 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2132 nla_put_be16(skb, IFLA_GRE_OFLAGS,
2133 gre_tnl_flags_to_gre_flags(o_flags)) ||
2134 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2135 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2136 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2137 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2138 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2139 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2140 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2141 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2142 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
2143 goto nla_put_failure;
2144
2145 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2146 t->encap.type) ||
2147 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2148 t->encap.sport) ||
2149 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2150 t->encap.dport) ||
2151 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2152 t->encap.flags))
2153 goto nla_put_failure;
2154
2155 if (p->collect_md) {
2156 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2157 goto nla_put_failure;
2158 }
2159
2160 return 0;
2161
2162 nla_put_failure:
2163 return -EMSGSIZE;
2164 }
2165
2166 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2167 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2168 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2169 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2170 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2171 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2172 [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct ipv6hdr, saddr) },
2173 [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct ipv6hdr, daddr) },
2174 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2175 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2176 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2177 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
2178 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2179 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2180 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2181 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
2182 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2183 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
2184 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2185 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2186 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2187 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
2188 };
2189
ip6erspan_tap_setup(struct net_device * dev)2190 static void ip6erspan_tap_setup(struct net_device *dev)
2191 {
2192 ether_setup(dev);
2193
2194 dev->max_mtu = 0;
2195 dev->netdev_ops = &ip6erspan_netdev_ops;
2196 dev->needs_free_netdev = true;
2197 dev->priv_destructor = ip6gre_dev_free;
2198
2199 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
2200 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2201 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2202 netif_keep_dst(dev);
2203 }
2204
ip6erspan_newlink(struct net_device * dev,struct rtnl_newlink_params * params,struct netlink_ext_ack * extack)2205 static int ip6erspan_newlink(struct net_device *dev,
2206 struct rtnl_newlink_params *params,
2207 struct netlink_ext_ack *extack)
2208 {
2209 struct net *net = params->link_net ? : dev_net(dev);
2210 struct ip6_tnl *nt = netdev_priv(dev);
2211 struct nlattr **data = params->data;
2212 struct nlattr **tb = params->tb;
2213 struct ip6gre_net *ign;
2214 int err;
2215
2216 ip6gre_netlink_parms(data, &nt->parms);
2217 ip6erspan_set_version(data, &nt->parms);
2218 ign = net_generic(net, ip6gre_net_id);
2219
2220 if (nt->parms.collect_md) {
2221 if (rtnl_dereference(ign->collect_md_tun_erspan))
2222 return -EEXIST;
2223 } else {
2224 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2225 return -EEXIST;
2226 }
2227
2228 err = ip6gre_newlink_common(net, dev, tb, data, extack);
2229 if (!err) {
2230 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2231 ip6erspan_tunnel_link_md(ign, nt);
2232 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2233 }
2234 return err;
2235 }
2236
ip6erspan_tnl_link_config(struct ip6_tnl * t,int set_mtu)2237 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2238 {
2239 ip6gre_tnl_link_config_common(t);
2240 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2241 }
2242
ip6erspan_tnl_change(struct ip6_tnl * t,const struct __ip6_tnl_parm * p,int set_mtu)2243 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2244 const struct __ip6_tnl_parm *p, int set_mtu)
2245 {
2246 ip6gre_tnl_copy_tnl_parm(t, p);
2247 ip6erspan_tnl_link_config(t, set_mtu);
2248 return 0;
2249 }
2250
ip6erspan_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2251 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2252 struct nlattr *data[],
2253 struct netlink_ext_ack *extack)
2254 {
2255 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2256 struct __ip6_tnl_parm p;
2257 struct ip6_tnl *t;
2258
2259 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2260 if (IS_ERR(t))
2261 return PTR_ERR(t);
2262
2263 ip6erspan_set_version(data, &p);
2264 ip6gre_tunnel_unlink_md(ign, t);
2265 ip6gre_tunnel_unlink(ign, t);
2266 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2267 ip6erspan_tunnel_link_md(ign, t);
2268 ip6gre_tunnel_link(ign, t);
2269 return 0;
2270 }
2271
2272 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2273 .kind = "ip6gre",
2274 .maxtype = IFLA_GRE_MAX,
2275 .policy = ip6gre_policy,
2276 .priv_size = sizeof(struct ip6_tnl),
2277 .setup = ip6gre_tunnel_setup,
2278 .validate = ip6gre_tunnel_validate,
2279 .newlink = ip6gre_newlink,
2280 .changelink = ip6gre_changelink,
2281 .dellink = ip6gre_dellink,
2282 .get_size = ip6gre_get_size,
2283 .fill_info = ip6gre_fill_info,
2284 .get_link_net = ip6_tnl_get_link_net,
2285 };
2286
2287 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2288 .kind = "ip6gretap",
2289 .maxtype = IFLA_GRE_MAX,
2290 .policy = ip6gre_policy,
2291 .priv_size = sizeof(struct ip6_tnl),
2292 .setup = ip6gre_tap_setup,
2293 .validate = ip6gre_tap_validate,
2294 .newlink = ip6gre_newlink,
2295 .changelink = ip6gre_changelink,
2296 .get_size = ip6gre_get_size,
2297 .fill_info = ip6gre_fill_info,
2298 .get_link_net = ip6_tnl_get_link_net,
2299 };
2300
2301 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2302 .kind = "ip6erspan",
2303 .maxtype = IFLA_GRE_MAX,
2304 .policy = ip6gre_policy,
2305 .priv_size = sizeof(struct ip6_tnl),
2306 .setup = ip6erspan_tap_setup,
2307 .validate = ip6erspan_tap_validate,
2308 .newlink = ip6erspan_newlink,
2309 .changelink = ip6erspan_changelink,
2310 .get_size = ip6gre_get_size,
2311 .fill_info = ip6gre_fill_info,
2312 .get_link_net = ip6_tnl_get_link_net,
2313 };
2314
2315 /*
2316 * And now the modules code and kernel interface.
2317 */
2318
ip6gre_init(void)2319 static int __init ip6gre_init(void)
2320 {
2321 int err;
2322
2323 pr_info("GRE over IPv6 tunneling driver\n");
2324
2325 err = register_pernet_device(&ip6gre_net_ops);
2326 if (err < 0)
2327 return err;
2328
2329 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2330 if (err < 0) {
2331 pr_info("%s: can't add protocol\n", __func__);
2332 goto add_proto_failed;
2333 }
2334
2335 err = rtnl_link_register(&ip6gre_link_ops);
2336 if (err < 0)
2337 goto rtnl_link_failed;
2338
2339 err = rtnl_link_register(&ip6gre_tap_ops);
2340 if (err < 0)
2341 goto tap_ops_failed;
2342
2343 err = rtnl_link_register(&ip6erspan_tap_ops);
2344 if (err < 0)
2345 goto erspan_link_failed;
2346
2347 out:
2348 return err;
2349
2350 erspan_link_failed:
2351 rtnl_link_unregister(&ip6gre_tap_ops);
2352 tap_ops_failed:
2353 rtnl_link_unregister(&ip6gre_link_ops);
2354 rtnl_link_failed:
2355 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2356 add_proto_failed:
2357 unregister_pernet_device(&ip6gre_net_ops);
2358 goto out;
2359 }
2360
ip6gre_fini(void)2361 static void __exit ip6gre_fini(void)
2362 {
2363 rtnl_link_unregister(&ip6gre_tap_ops);
2364 rtnl_link_unregister(&ip6gre_link_ops);
2365 rtnl_link_unregister(&ip6erspan_tap_ops);
2366 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2367 unregister_pernet_device(&ip6gre_net_ops);
2368 }
2369
2370 module_init(ip6gre_init);
2371 module_exit(ip6gre_fini);
2372 MODULE_LICENSE("GPL");
2373 MODULE_AUTHOR("D. Kozlov <xeb@mail.ru>");
2374 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2375 MODULE_ALIAS_RTNL_LINK("ip6gre");
2376 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2377 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2378 MODULE_ALIAS_NETDEV("ip6gre0");
2379