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);
333 } else {
334 strscpy(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 /* MUST set options_len before referencing options */
539 info = &tun_dst->u.tun_info;
540 info->options_len = sizeof(*md);
541
542 /* skb can be uncloned in __iptunnel_pull_header, so
543 * old pkt_md is no longer valid and we need to reset
544 * it
545 */
546 gh = skb_network_header(skb) +
547 skb_network_header_len(skb);
548 pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len +
549 sizeof(*ershdr));
550 md = ip_tunnel_info_opts(info);
551 md->version = ver;
552 md2 = &md->u.md2;
553 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
554 ERSPAN_V2_MDSIZE);
555 __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT,
556 info->key.tun_flags);
557
558 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
559
560 } else {
561 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
562 }
563
564 return PACKET_RCVD;
565 }
566
567 return PACKET_REJECT;
568 }
569
gre_rcv(struct sk_buff * skb)570 static int gre_rcv(struct sk_buff *skb)
571 {
572 struct tnl_ptk_info tpi;
573 bool csum_err = false;
574 int hdr_len;
575
576 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
577 if (hdr_len < 0)
578 goto drop;
579
580 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
581 goto drop;
582
583 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
584 tpi.proto == htons(ETH_P_ERSPAN2))) {
585 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
586 return 0;
587 goto out;
588 }
589
590 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
591 return 0;
592
593 out:
594 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
595 drop:
596 kfree_skb(skb);
597 return 0;
598 }
599
gre_handle_offloads(struct sk_buff * skb,bool csum)600 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
601 {
602 return iptunnel_handle_offloads(skb,
603 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
604 }
605
prepare_ip6gre_xmit_ipv4(struct sk_buff * skb,struct net_device * dev,struct flowi6 * fl6,__u8 * dsfield,int * encap_limit)606 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
607 struct net_device *dev,
608 struct flowi6 *fl6, __u8 *dsfield,
609 int *encap_limit)
610 {
611 const struct iphdr *iph = ip_hdr(skb);
612 struct ip6_tnl *t = netdev_priv(dev);
613
614 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
615 *encap_limit = t->parms.encap_limit;
616
617 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
618
619 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
620 *dsfield = ipv4_get_dsfield(iph);
621 else
622 *dsfield = ip6_tclass(t->parms.flowinfo);
623
624 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
625 fl6->flowi6_mark = skb->mark;
626 else
627 fl6->flowi6_mark = t->parms.fwmark;
628
629 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
630 }
631
prepare_ip6gre_xmit_ipv6(struct sk_buff * skb,struct net_device * dev,struct flowi6 * fl6,__u8 * dsfield,int * encap_limit)632 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
633 struct net_device *dev,
634 struct flowi6 *fl6, __u8 *dsfield,
635 int *encap_limit)
636 {
637 struct ipv6hdr *ipv6h;
638 struct ip6_tnl *t = netdev_priv(dev);
639 __u16 offset;
640
641 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
642 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
643 ipv6h = ipv6_hdr(skb);
644
645 if (offset > 0) {
646 struct ipv6_tlv_tnl_enc_lim *tel;
647
648 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
649 if (tel->encap_limit == 0) {
650 icmpv6_ndo_send(skb, ICMPV6_PARAMPROB,
651 ICMPV6_HDR_FIELD, offset + 2);
652 return -1;
653 }
654 *encap_limit = tel->encap_limit - 1;
655 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
656 *encap_limit = t->parms.encap_limit;
657 }
658
659 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
660
661 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
662 *dsfield = ipv6_get_dsfield(ipv6h);
663 else
664 *dsfield = ip6_tclass(t->parms.flowinfo);
665
666 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
667 fl6->flowlabel |= ip6_flowlabel(ipv6h);
668
669 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
670 fl6->flowi6_mark = skb->mark;
671 else
672 fl6->flowi6_mark = t->parms.fwmark;
673
674 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
675
676 return 0;
677 }
678
prepare_ip6gre_xmit_other(struct sk_buff * skb,struct net_device * dev,struct flowi6 * fl6,__u8 * dsfield,int * encap_limit)679 static int prepare_ip6gre_xmit_other(struct sk_buff *skb,
680 struct net_device *dev,
681 struct flowi6 *fl6, __u8 *dsfield,
682 int *encap_limit)
683 {
684 struct ip6_tnl *t = netdev_priv(dev);
685
686 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
687 *encap_limit = t->parms.encap_limit;
688
689 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
690
691 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
692 *dsfield = 0;
693 else
694 *dsfield = ip6_tclass(t->parms.flowinfo);
695
696 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
697 fl6->flowi6_mark = skb->mark;
698 else
699 fl6->flowi6_mark = t->parms.fwmark;
700
701 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
702
703 return 0;
704 }
705
skb_tunnel_info_txcheck(struct sk_buff * skb)706 static struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb)
707 {
708 struct ip_tunnel_info *tun_info;
709
710 tun_info = skb_tunnel_info(skb);
711 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX)))
712 return ERR_PTR(-EINVAL);
713
714 return tun_info;
715 }
716
__gre6_xmit(struct sk_buff * skb,struct net_device * dev,__u8 dsfield,struct flowi6 * fl6,int encap_limit,__u32 * pmtu,__be16 proto)717 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
718 struct net_device *dev, __u8 dsfield,
719 struct flowi6 *fl6, int encap_limit,
720 __u32 *pmtu, __be16 proto)
721 {
722 struct ip6_tnl *tunnel = netdev_priv(dev);
723 IP_TUNNEL_DECLARE_FLAGS(flags);
724 __be16 protocol;
725
726 if (dev->type == ARPHRD_ETHER)
727 IPCB(skb)->flags = 0;
728
729 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
730 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
731 else
732 fl6->daddr = tunnel->parms.raddr;
733
734 /* Push GRE header. */
735 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
736
737 if (tunnel->parms.collect_md) {
738 struct ip_tunnel_info *tun_info;
739 const struct ip_tunnel_key *key;
740 int tun_hlen;
741
742 tun_info = skb_tunnel_info_txcheck(skb);
743 if (IS_ERR(tun_info) ||
744 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
745 return -EINVAL;
746
747 key = &tun_info->key;
748 memset(fl6, 0, sizeof(*fl6));
749 fl6->flowi6_proto = IPPROTO_GRE;
750 fl6->daddr = key->u.ipv6.dst;
751 fl6->flowlabel = key->label;
752 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
753 fl6->fl6_gre_key = tunnel_id_to_key32(key->tun_id);
754
755 dsfield = key->tos;
756 ip_tunnel_flags_zero(flags);
757 __set_bit(IP_TUNNEL_CSUM_BIT, flags);
758 __set_bit(IP_TUNNEL_KEY_BIT, flags);
759 __set_bit(IP_TUNNEL_SEQ_BIT, flags);
760 ip_tunnel_flags_and(flags, flags, key->tun_flags);
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 test_bit(IP_TUNNEL_SEQ_BIT, flags) ?
770 htonl(atomic_fetch_inc(&tunnel->o_seqno)) :
771 0);
772
773 } else {
774 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
775 return -ENOMEM;
776
777 ip_tunnel_flags_copy(flags, tunnel->parms.o_flags);
778
779 gre_build_header(skb, tunnel->tun_hlen, flags,
780 protocol, tunnel->parms.o_key,
781 test_bit(IP_TUNNEL_SEQ_BIT, flags) ?
782 htonl(atomic_fetch_inc(&tunnel->o_seqno)) :
783 0);
784 }
785
786 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
787 NEXTHDR_GRE);
788 }
789
ip6gre_xmit_ipv4(struct sk_buff * skb,struct net_device * dev)790 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
791 {
792 struct ip6_tnl *t = netdev_priv(dev);
793 int encap_limit = -1;
794 struct flowi6 fl6;
795 __u8 dsfield = 0;
796 __u32 mtu;
797 int err;
798
799 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
800
801 if (!t->parms.collect_md)
802 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
803 &dsfield, &encap_limit);
804
805 err = gre_handle_offloads(skb, test_bit(IP_TUNNEL_CSUM_BIT,
806 t->parms.o_flags));
807 if (err)
808 return -1;
809
810 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
811 skb->protocol);
812 if (err != 0) {
813 /* XXX: send ICMP error even if DF is not set. */
814 if (err == -EMSGSIZE)
815 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
816 htonl(mtu));
817 return -1;
818 }
819
820 return 0;
821 }
822
ip6gre_xmit_ipv6(struct sk_buff * skb,struct net_device * dev)823 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
824 {
825 struct ip6_tnl *t = netdev_priv(dev);
826 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
827 int encap_limit = -1;
828 struct flowi6 fl6;
829 __u8 dsfield = 0;
830 __u32 mtu;
831 int err;
832
833 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
834 return -1;
835
836 if (!t->parms.collect_md &&
837 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
838 return -1;
839
840 if (gre_handle_offloads(skb, test_bit(IP_TUNNEL_CSUM_BIT,
841 t->parms.o_flags)))
842 return -1;
843
844 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
845 &mtu, skb->protocol);
846 if (err != 0) {
847 if (err == -EMSGSIZE)
848 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
849 return -1;
850 }
851
852 return 0;
853 }
854
ip6gre_xmit_other(struct sk_buff * skb,struct net_device * dev)855 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
856 {
857 struct ip6_tnl *t = netdev_priv(dev);
858 int encap_limit = -1;
859 struct flowi6 fl6;
860 __u8 dsfield = 0;
861 __u32 mtu;
862 int err;
863
864 if (!t->parms.collect_md &&
865 prepare_ip6gre_xmit_other(skb, dev, &fl6, &dsfield, &encap_limit))
866 return -1;
867
868 err = gre_handle_offloads(skb, test_bit(IP_TUNNEL_CSUM_BIT,
869 t->parms.o_flags));
870 if (err)
871 return err;
872 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, skb->protocol);
873
874 return err;
875 }
876
ip6gre_tunnel_xmit(struct sk_buff * skb,struct net_device * dev)877 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
878 struct net_device *dev)
879 {
880 struct ip6_tnl *t = netdev_priv(dev);
881 __be16 payload_protocol;
882 int ret;
883
884 if (!pskb_inet_may_pull(skb))
885 goto tx_err;
886
887 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
888 goto tx_err;
889
890 payload_protocol = skb_protocol(skb, true);
891 switch (payload_protocol) {
892 case htons(ETH_P_IP):
893 ret = ip6gre_xmit_ipv4(skb, dev);
894 break;
895 case htons(ETH_P_IPV6):
896 ret = ip6gre_xmit_ipv6(skb, dev);
897 break;
898 default:
899 ret = ip6gre_xmit_other(skb, dev);
900 break;
901 }
902
903 if (ret < 0)
904 goto tx_err;
905
906 return NETDEV_TX_OK;
907
908 tx_err:
909 if (!t->parms.collect_md || !IS_ERR(skb_tunnel_info_txcheck(skb)))
910 DEV_STATS_INC(dev, tx_errors);
911 DEV_STATS_INC(dev, tx_dropped);
912 kfree_skb(skb);
913 return NETDEV_TX_OK;
914 }
915
ip6erspan_tunnel_xmit(struct sk_buff * skb,struct net_device * dev)916 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
917 struct net_device *dev)
918 {
919 struct ip_tunnel_info *tun_info = NULL;
920 struct ip6_tnl *t = netdev_priv(dev);
921 struct dst_entry *dst = skb_dst(skb);
922 IP_TUNNEL_DECLARE_FLAGS(flags) = { };
923 bool truncate = false;
924 int encap_limit = -1;
925 __u8 dsfield = false;
926 struct flowi6 fl6;
927 int err = -EINVAL;
928 __be16 proto;
929 __u32 mtu;
930 int nhoff;
931
932 if (!pskb_inet_may_pull(skb))
933 goto tx_err;
934
935 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
936 goto tx_err;
937
938 if (gre_handle_offloads(skb, false))
939 goto tx_err;
940
941 if (skb->len > dev->mtu + dev->hard_header_len) {
942 if (pskb_trim(skb, dev->mtu + dev->hard_header_len))
943 goto tx_err;
944 truncate = true;
945 }
946
947 nhoff = skb_network_offset(skb);
948 if (skb->protocol == htons(ETH_P_IP) &&
949 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
950 truncate = true;
951
952 if (skb->protocol == htons(ETH_P_IPV6)) {
953 int thoff;
954
955 if (skb_transport_header_was_set(skb))
956 thoff = skb_transport_offset(skb);
957 else
958 thoff = nhoff + sizeof(struct ipv6hdr);
959 if (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)
960 truncate = true;
961 }
962
963 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
964 goto tx_err;
965
966 __clear_bit(IP_TUNNEL_KEY_BIT, t->parms.o_flags);
967 IPCB(skb)->flags = 0;
968
969 /* For collect_md mode, derive fl6 from the tunnel key,
970 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
971 */
972 if (t->parms.collect_md) {
973 const struct ip_tunnel_key *key;
974 struct erspan_metadata *md;
975 __be32 tun_id;
976
977 tun_info = skb_tunnel_info_txcheck(skb);
978 if (IS_ERR(tun_info) ||
979 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
980 goto tx_err;
981
982 key = &tun_info->key;
983 memset(&fl6, 0, sizeof(fl6));
984 fl6.flowi6_proto = IPPROTO_GRE;
985 fl6.daddr = key->u.ipv6.dst;
986 fl6.flowlabel = key->label;
987 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
988 fl6.fl6_gre_key = tunnel_id_to_key32(key->tun_id);
989
990 dsfield = key->tos;
991 if (!test_bit(IP_TUNNEL_ERSPAN_OPT_BIT,
992 tun_info->key.tun_flags))
993 goto tx_err;
994 if (tun_info->options_len < sizeof(*md))
995 goto tx_err;
996 md = ip_tunnel_info_opts(tun_info);
997
998 tun_id = tunnel_id_to_key32(key->tun_id);
999 if (md->version == 1) {
1000 erspan_build_header(skb,
1001 ntohl(tun_id),
1002 ntohl(md->u.index), truncate,
1003 false);
1004 proto = htons(ETH_P_ERSPAN);
1005 } else if (md->version == 2) {
1006 erspan_build_header_v2(skb,
1007 ntohl(tun_id),
1008 md->u.md2.dir,
1009 get_hwid(&md->u.md2),
1010 truncate, false);
1011 proto = htons(ETH_P_ERSPAN2);
1012 } else {
1013 goto tx_err;
1014 }
1015 } else {
1016 switch (skb->protocol) {
1017 case htons(ETH_P_IP):
1018 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1019 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1020 &dsfield, &encap_limit);
1021 break;
1022 case htons(ETH_P_IPV6):
1023 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1024 goto tx_err;
1025 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1026 &dsfield, &encap_limit))
1027 goto tx_err;
1028 break;
1029 default:
1030 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1031 break;
1032 }
1033
1034 if (t->parms.erspan_ver == 1) {
1035 erspan_build_header(skb, ntohl(t->parms.o_key),
1036 t->parms.index,
1037 truncate, false);
1038 proto = htons(ETH_P_ERSPAN);
1039 } else if (t->parms.erspan_ver == 2) {
1040 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1041 t->parms.dir,
1042 t->parms.hwid,
1043 truncate, false);
1044 proto = htons(ETH_P_ERSPAN2);
1045 } else {
1046 goto tx_err;
1047 }
1048
1049 fl6.daddr = t->parms.raddr;
1050 }
1051
1052 /* Push GRE header. */
1053 __set_bit(IP_TUNNEL_SEQ_BIT, flags);
1054 gre_build_header(skb, 8, flags, proto, 0,
1055 htonl(atomic_fetch_inc(&t->o_seqno)));
1056
1057 /* TooBig packet may have updated dst->dev's mtu */
1058 if (!t->parms.collect_md && dst) {
1059 mtu = READ_ONCE(dst_dev(dst)->mtu);
1060 if (dst_mtu(dst) > mtu)
1061 dst->ops->update_pmtu(dst, NULL, skb, mtu, false);
1062 }
1063 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1064 NEXTHDR_GRE);
1065 if (err != 0) {
1066 /* XXX: send ICMP error even if DF is not set. */
1067 if (err == -EMSGSIZE) {
1068 if (skb->protocol == htons(ETH_P_IP))
1069 icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1070 ICMP_FRAG_NEEDED, htonl(mtu));
1071 else
1072 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1073 }
1074
1075 goto tx_err;
1076 }
1077 return NETDEV_TX_OK;
1078
1079 tx_err:
1080 if (!IS_ERR(tun_info))
1081 DEV_STATS_INC(dev, tx_errors);
1082 DEV_STATS_INC(dev, tx_dropped);
1083 kfree_skb(skb);
1084 return NETDEV_TX_OK;
1085 }
1086
ip6gre_tnl_link_config_common(struct ip6_tnl * t)1087 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1088 {
1089 struct net_device *dev = t->dev;
1090 struct __ip6_tnl_parm *p = &t->parms;
1091 struct flowi6 *fl6 = &t->fl.u.ip6;
1092
1093 if (dev->type != ARPHRD_ETHER) {
1094 __dev_addr_set(dev, &p->laddr, sizeof(struct in6_addr));
1095 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1096 }
1097
1098 /* Set up flowi template */
1099 fl6->saddr = p->laddr;
1100 fl6->daddr = p->raddr;
1101 fl6->flowi6_oif = p->link;
1102 fl6->flowlabel = 0;
1103 fl6->flowi6_proto = IPPROTO_GRE;
1104 fl6->fl6_gre_key = t->parms.o_key;
1105
1106 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1107 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1108 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1109 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1110
1111 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1112 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1113
1114 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1115 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1116 dev->flags |= IFF_POINTOPOINT;
1117 else
1118 dev->flags &= ~IFF_POINTOPOINT;
1119 }
1120
ip6gre_tnl_link_config_route(struct ip6_tnl * t,int set_mtu,int t_hlen)1121 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1122 int t_hlen)
1123 {
1124 const struct __ip6_tnl_parm *p = &t->parms;
1125 struct net_device *dev = t->dev;
1126
1127 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1128 int strict = (ipv6_addr_type(&p->raddr) &
1129 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1130
1131 struct rt6_info *rt = rt6_lookup(t->net,
1132 &p->raddr, &p->laddr,
1133 p->link, NULL, strict);
1134
1135 if (!rt)
1136 return;
1137
1138 if (rt->dst.dev) {
1139 unsigned short dst_len = rt->dst.dev->hard_header_len +
1140 t_hlen;
1141
1142 if (t->dev->header_ops)
1143 dev->hard_header_len = dst_len;
1144 else
1145 dev->needed_headroom = dst_len;
1146
1147 if (set_mtu) {
1148 int mtu = rt->dst.dev->mtu - t_hlen;
1149
1150 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1151 mtu -= 8;
1152 if (dev->type == ARPHRD_ETHER)
1153 mtu -= ETH_HLEN;
1154
1155 if (mtu < IPV6_MIN_MTU)
1156 mtu = IPV6_MIN_MTU;
1157 WRITE_ONCE(dev->mtu, mtu);
1158 }
1159 }
1160 ip6_rt_put(rt);
1161 }
1162 }
1163
ip6gre_calc_hlen(struct ip6_tnl * tunnel)1164 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1165 {
1166 int t_hlen;
1167
1168 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1169 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1170
1171 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1172
1173 if (tunnel->dev->header_ops)
1174 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1175 else
1176 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1177
1178 return t_hlen;
1179 }
1180
ip6gre_tnl_link_config(struct ip6_tnl * t,int set_mtu)1181 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1182 {
1183 ip6gre_tnl_link_config_common(t);
1184 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1185 }
1186
ip6gre_tnl_copy_tnl_parm(struct ip6_tnl * t,const struct __ip6_tnl_parm * p)1187 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1188 const struct __ip6_tnl_parm *p)
1189 {
1190 t->parms.laddr = p->laddr;
1191 t->parms.raddr = p->raddr;
1192 t->parms.flags = p->flags;
1193 t->parms.hop_limit = p->hop_limit;
1194 t->parms.encap_limit = p->encap_limit;
1195 t->parms.flowinfo = p->flowinfo;
1196 t->parms.link = p->link;
1197 t->parms.proto = p->proto;
1198 t->parms.i_key = p->i_key;
1199 t->parms.o_key = p->o_key;
1200 ip_tunnel_flags_copy(t->parms.i_flags, p->i_flags);
1201 ip_tunnel_flags_copy(t->parms.o_flags, p->o_flags);
1202 t->parms.fwmark = p->fwmark;
1203 t->parms.erspan_ver = p->erspan_ver;
1204 t->parms.index = p->index;
1205 t->parms.dir = p->dir;
1206 t->parms.hwid = p->hwid;
1207 dst_cache_reset(&t->dst_cache);
1208 }
1209
ip6gre_tnl_change(struct ip6_tnl * t,const struct __ip6_tnl_parm * p,int set_mtu)1210 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1211 int set_mtu)
1212 {
1213 ip6gre_tnl_copy_tnl_parm(t, p);
1214 ip6gre_tnl_link_config(t, set_mtu);
1215 return 0;
1216 }
1217
ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm * p,const struct ip6_tnl_parm2 * u)1218 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1219 const struct ip6_tnl_parm2 *u)
1220 {
1221 p->laddr = u->laddr;
1222 p->raddr = u->raddr;
1223 p->flags = u->flags;
1224 p->hop_limit = u->hop_limit;
1225 p->encap_limit = u->encap_limit;
1226 p->flowinfo = u->flowinfo;
1227 p->link = u->link;
1228 p->i_key = u->i_key;
1229 p->o_key = u->o_key;
1230 gre_flags_to_tnl_flags(p->i_flags, u->i_flags);
1231 gre_flags_to_tnl_flags(p->o_flags, u->o_flags);
1232 memcpy(p->name, u->name, sizeof(u->name));
1233 }
1234
ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 * u,const struct __ip6_tnl_parm * p)1235 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1236 const struct __ip6_tnl_parm *p)
1237 {
1238 u->proto = IPPROTO_GRE;
1239 u->laddr = p->laddr;
1240 u->raddr = p->raddr;
1241 u->flags = p->flags;
1242 u->hop_limit = p->hop_limit;
1243 u->encap_limit = p->encap_limit;
1244 u->flowinfo = p->flowinfo;
1245 u->link = p->link;
1246 u->i_key = p->i_key;
1247 u->o_key = p->o_key;
1248 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1249 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1250 memcpy(u->name, p->name, sizeof(u->name));
1251 }
1252
ip6gre_tunnel_siocdevprivate(struct net_device * dev,struct ifreq * ifr,void __user * data,int cmd)1253 static int ip6gre_tunnel_siocdevprivate(struct net_device *dev,
1254 struct ifreq *ifr, void __user *data,
1255 int cmd)
1256 {
1257 int err = 0;
1258 struct ip6_tnl_parm2 p;
1259 struct __ip6_tnl_parm p1;
1260 struct ip6_tnl *t = netdev_priv(dev);
1261 struct net *net = t->net;
1262 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1263
1264 memset(&p1, 0, sizeof(p1));
1265
1266 switch (cmd) {
1267 case SIOCGETTUNNEL:
1268 if (dev == ign->fb_tunnel_dev) {
1269 if (copy_from_user(&p, data, sizeof(p))) {
1270 err = -EFAULT;
1271 break;
1272 }
1273 ip6gre_tnl_parm_from_user(&p1, &p);
1274 t = ip6gre_tunnel_locate(net, &p1, 0);
1275 if (!t)
1276 t = netdev_priv(dev);
1277 }
1278 memset(&p, 0, sizeof(p));
1279 ip6gre_tnl_parm_to_user(&p, &t->parms);
1280 if (copy_to_user(data, &p, sizeof(p)))
1281 err = -EFAULT;
1282 break;
1283
1284 case SIOCADDTUNNEL:
1285 case SIOCCHGTUNNEL:
1286 err = -EPERM;
1287 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1288 goto done;
1289
1290 err = -EFAULT;
1291 if (copy_from_user(&p, data, sizeof(p)))
1292 goto done;
1293
1294 err = -EINVAL;
1295 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1296 goto done;
1297
1298 if (!(p.i_flags&GRE_KEY))
1299 p.i_key = 0;
1300 if (!(p.o_flags&GRE_KEY))
1301 p.o_key = 0;
1302
1303 ip6gre_tnl_parm_from_user(&p1, &p);
1304 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1305
1306 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1307 if (t) {
1308 if (t->dev != dev) {
1309 err = -EEXIST;
1310 break;
1311 }
1312 } else {
1313 t = netdev_priv(dev);
1314
1315 ip6gre_tunnel_unlink(ign, t);
1316 synchronize_net();
1317 ip6gre_tnl_change(t, &p1, 1);
1318 ip6gre_tunnel_link(ign, t);
1319 netdev_state_change(dev);
1320 }
1321 }
1322
1323 if (t) {
1324 err = 0;
1325
1326 memset(&p, 0, sizeof(p));
1327 ip6gre_tnl_parm_to_user(&p, &t->parms);
1328 if (copy_to_user(data, &p, sizeof(p)))
1329 err = -EFAULT;
1330 } else
1331 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1332 break;
1333
1334 case SIOCDELTUNNEL:
1335 err = -EPERM;
1336 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1337 goto done;
1338
1339 if (dev == ign->fb_tunnel_dev) {
1340 err = -EFAULT;
1341 if (copy_from_user(&p, data, sizeof(p)))
1342 goto done;
1343 err = -ENOENT;
1344 ip6gre_tnl_parm_from_user(&p1, &p);
1345 t = ip6gre_tunnel_locate(net, &p1, 0);
1346 if (!t)
1347 goto done;
1348 err = -EPERM;
1349 if (t == netdev_priv(ign->fb_tunnel_dev))
1350 goto done;
1351 dev = t->dev;
1352 }
1353 unregister_netdevice(dev);
1354 err = 0;
1355 break;
1356
1357 default:
1358 err = -EINVAL;
1359 }
1360
1361 done:
1362 return err;
1363 }
1364
ip6gre_header(struct sk_buff * skb,struct net_device * dev,unsigned short type,const void * daddr,const void * saddr,unsigned int len)1365 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1366 unsigned short type, const void *daddr,
1367 const void *saddr, unsigned int len)
1368 {
1369 struct ip6_tnl *t = netdev_priv(dev);
1370 struct ipv6hdr *ipv6h;
1371 int needed;
1372 __be16 *p;
1373
1374 needed = t->hlen + sizeof(*ipv6h);
1375 if (skb_headroom(skb) < needed &&
1376 pskb_expand_head(skb, HH_DATA_ALIGN(needed - skb_headroom(skb)),
1377 0, GFP_ATOMIC))
1378 return -needed;
1379
1380 ipv6h = skb_push(skb, needed);
1381 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1382 t->fl.u.ip6.flowlabel,
1383 true, &t->fl.u.ip6));
1384 ipv6h->hop_limit = t->parms.hop_limit;
1385 ipv6h->nexthdr = NEXTHDR_GRE;
1386 ipv6h->saddr = t->parms.laddr;
1387 ipv6h->daddr = t->parms.raddr;
1388
1389 p = (__be16 *)(ipv6h + 1);
1390 p[0] = ip_tunnel_flags_to_be16(t->parms.o_flags);
1391 p[1] = htons(type);
1392
1393 /*
1394 * Set the source hardware address.
1395 */
1396
1397 if (saddr)
1398 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1399 if (daddr)
1400 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1401 if (!ipv6_addr_any(&ipv6h->daddr))
1402 return t->hlen;
1403
1404 return -t->hlen;
1405 }
1406
1407 static const struct header_ops ip6gre_header_ops = {
1408 .create = ip6gre_header,
1409 };
1410
1411 static const struct net_device_ops ip6gre_netdev_ops = {
1412 .ndo_init = ip6gre_tunnel_init,
1413 .ndo_uninit = ip6gre_tunnel_uninit,
1414 .ndo_start_xmit = ip6gre_tunnel_xmit,
1415 .ndo_siocdevprivate = ip6gre_tunnel_siocdevprivate,
1416 .ndo_change_mtu = ip6_tnl_change_mtu,
1417 .ndo_get_iflink = ip6_tnl_get_iflink,
1418 };
1419
ip6gre_dev_free(struct net_device * dev)1420 static void ip6gre_dev_free(struct net_device *dev)
1421 {
1422 struct ip6_tnl *t = netdev_priv(dev);
1423
1424 gro_cells_destroy(&t->gro_cells);
1425 dst_cache_destroy(&t->dst_cache);
1426 }
1427
ip6gre_tunnel_setup(struct net_device * dev)1428 static void ip6gre_tunnel_setup(struct net_device *dev)
1429 {
1430 dev->netdev_ops = &ip6gre_netdev_ops;
1431 dev->needs_free_netdev = true;
1432 dev->priv_destructor = ip6gre_dev_free;
1433
1434 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
1435 dev->type = ARPHRD_IP6GRE;
1436
1437 dev->flags |= IFF_NOARP;
1438 dev->addr_len = sizeof(struct in6_addr);
1439 netif_keep_dst(dev);
1440 /* This perm addr will be used as interface identifier by IPv6 */
1441 dev->addr_assign_type = NET_ADDR_RANDOM;
1442 eth_random_addr(dev->perm_addr);
1443 }
1444
1445 #define GRE6_FEATURES (NETIF_F_SG | \
1446 NETIF_F_FRAGLIST | \
1447 NETIF_F_HIGHDMA | \
1448 NETIF_F_HW_CSUM)
1449
ip6gre_tnl_init_features(struct net_device * dev)1450 static void ip6gre_tnl_init_features(struct net_device *dev)
1451 {
1452 struct ip6_tnl *nt = netdev_priv(dev);
1453
1454 dev->features |= GRE6_FEATURES;
1455 dev->hw_features |= GRE6_FEATURES;
1456
1457 /* TCP offload with GRE SEQ is not supported, nor can we support 2
1458 * levels of outer headers requiring an update.
1459 */
1460 if (test_bit(IP_TUNNEL_SEQ_BIT, nt->parms.o_flags))
1461 return;
1462 if (test_bit(IP_TUNNEL_CSUM_BIT, nt->parms.o_flags) &&
1463 nt->encap.type != TUNNEL_ENCAP_NONE)
1464 return;
1465
1466 dev->features |= NETIF_F_GSO_SOFTWARE;
1467 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1468
1469 dev->lltx = true;
1470 }
1471
ip6gre_tunnel_init_common(struct net_device * dev)1472 static int ip6gre_tunnel_init_common(struct net_device *dev)
1473 {
1474 struct ip6_tnl *tunnel;
1475 int ret;
1476 int t_hlen;
1477
1478 tunnel = netdev_priv(dev);
1479
1480 tunnel->dev = dev;
1481 strscpy(tunnel->parms.name, dev->name);
1482
1483 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1484 if (ret)
1485 return ret;
1486
1487 ret = gro_cells_init(&tunnel->gro_cells, dev);
1488 if (ret)
1489 goto cleanup_dst_cache_init;
1490
1491 t_hlen = ip6gre_calc_hlen(tunnel);
1492 dev->mtu = ETH_DATA_LEN - t_hlen;
1493 if (dev->type == ARPHRD_ETHER)
1494 dev->mtu -= ETH_HLEN;
1495 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1496 dev->mtu -= 8;
1497
1498 if (tunnel->parms.collect_md) {
1499 netif_keep_dst(dev);
1500 }
1501 ip6gre_tnl_init_features(dev);
1502
1503 netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
1504 netdev_lockdep_set_classes(dev);
1505 return 0;
1506
1507 cleanup_dst_cache_init:
1508 dst_cache_destroy(&tunnel->dst_cache);
1509 return ret;
1510 }
1511
ip6gre_tunnel_init(struct net_device * dev)1512 static int ip6gre_tunnel_init(struct net_device *dev)
1513 {
1514 struct ip6_tnl *tunnel;
1515 int ret;
1516
1517 ret = ip6gre_tunnel_init_common(dev);
1518 if (ret)
1519 return ret;
1520
1521 tunnel = netdev_priv(dev);
1522
1523 if (tunnel->parms.collect_md)
1524 return 0;
1525
1526 __dev_addr_set(dev, &tunnel->parms.laddr, sizeof(struct in6_addr));
1527 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1528
1529 if (ipv6_addr_any(&tunnel->parms.raddr))
1530 dev->header_ops = &ip6gre_header_ops;
1531
1532 return 0;
1533 }
1534
ip6gre_fb_tunnel_init(struct net_device * dev)1535 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1536 {
1537 struct ip6_tnl *tunnel = netdev_priv(dev);
1538
1539 tunnel->dev = dev;
1540 tunnel->net = dev_net(dev);
1541 strscpy(tunnel->parms.name, dev->name);
1542
1543 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1544 }
1545
1546 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1547 .handler = gre_rcv,
1548 .err_handler = ip6gre_err,
1549 .flags = INET6_PROTO_FINAL,
1550 };
1551
ip6gre_exit_rtnl_net(struct net * net,struct list_head * head)1552 static void __net_exit ip6gre_exit_rtnl_net(struct net *net, struct list_head *head)
1553 {
1554 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1555 struct net_device *dev, *aux;
1556 int prio;
1557
1558 for_each_netdev_safe(net, dev, aux)
1559 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1560 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1561 dev->rtnl_link_ops == &ip6erspan_tap_ops)
1562 unregister_netdevice_queue(dev, head);
1563
1564 for (prio = 0; prio < 4; prio++) {
1565 int h;
1566 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1567 struct ip6_tnl *t;
1568
1569 t = rtnl_net_dereference(net, ign->tunnels[prio][h]);
1570
1571 while (t) {
1572 /* If dev is in the same netns, it has already
1573 * been added to the list by the previous loop.
1574 */
1575 if (!net_eq(dev_net(t->dev), net))
1576 unregister_netdevice_queue(t->dev, head);
1577
1578 t = rtnl_net_dereference(net, t->next);
1579 }
1580 }
1581 }
1582 }
1583
ip6gre_init_net(struct net * net)1584 static int __net_init ip6gre_init_net(struct net *net)
1585 {
1586 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1587 struct net_device *ndev;
1588 int err;
1589
1590 if (!net_has_fallback_tunnels(net))
1591 return 0;
1592 ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1593 NET_NAME_UNKNOWN, ip6gre_tunnel_setup);
1594 if (!ndev) {
1595 err = -ENOMEM;
1596 goto err_alloc_dev;
1597 }
1598 ign->fb_tunnel_dev = ndev;
1599 dev_net_set(ign->fb_tunnel_dev, net);
1600 /* FB netdevice is special: we have one, and only one per netns.
1601 * Allowing to move it to another netns is clearly unsafe.
1602 */
1603 ign->fb_tunnel_dev->netns_immutable = true;
1604
1605 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1606 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1607
1608 err = register_netdev(ign->fb_tunnel_dev);
1609 if (err)
1610 goto err_reg_dev;
1611
1612 rcu_assign_pointer(ign->tunnels_wc[0],
1613 netdev_priv(ign->fb_tunnel_dev));
1614 return 0;
1615
1616 err_reg_dev:
1617 free_netdev(ndev);
1618 err_alloc_dev:
1619 return err;
1620 }
1621
1622 static struct pernet_operations ip6gre_net_ops = {
1623 .init = ip6gre_init_net,
1624 .exit_rtnl = ip6gre_exit_rtnl_net,
1625 .id = &ip6gre_net_id,
1626 .size = sizeof(struct ip6gre_net),
1627 };
1628
ip6gre_tunnel_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1629 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1630 struct netlink_ext_ack *extack)
1631 {
1632 __be16 flags;
1633
1634 if (!data)
1635 return 0;
1636
1637 flags = 0;
1638 if (data[IFLA_GRE_IFLAGS])
1639 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1640 if (data[IFLA_GRE_OFLAGS])
1641 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1642 if (flags & (GRE_VERSION|GRE_ROUTING))
1643 return -EINVAL;
1644
1645 return 0;
1646 }
1647
ip6gre_tap_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1648 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1649 struct netlink_ext_ack *extack)
1650 {
1651 struct in6_addr daddr;
1652
1653 if (tb[IFLA_ADDRESS]) {
1654 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1655 return -EINVAL;
1656 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1657 return -EADDRNOTAVAIL;
1658 }
1659
1660 if (!data)
1661 goto out;
1662
1663 if (data[IFLA_GRE_REMOTE]) {
1664 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1665 if (ipv6_addr_any(&daddr))
1666 return -EINVAL;
1667 }
1668
1669 out:
1670 return ip6gre_tunnel_validate(tb, data, extack);
1671 }
1672
ip6erspan_tap_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1673 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1674 struct netlink_ext_ack *extack)
1675 {
1676 __be16 flags = 0;
1677 int ret, ver = 0;
1678
1679 if (!data)
1680 return 0;
1681
1682 ret = ip6gre_tap_validate(tb, data, extack);
1683 if (ret)
1684 return ret;
1685
1686 /* ERSPAN should only have GRE sequence and key flag */
1687 if (data[IFLA_GRE_OFLAGS])
1688 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1689 if (data[IFLA_GRE_IFLAGS])
1690 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1691 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1692 flags != (GRE_SEQ | GRE_KEY))
1693 return -EINVAL;
1694
1695 /* ERSPAN Session ID only has 10-bit. Since we reuse
1696 * 32-bit key field as ID, check it's range.
1697 */
1698 if (data[IFLA_GRE_IKEY] &&
1699 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1700 return -EINVAL;
1701
1702 if (data[IFLA_GRE_OKEY] &&
1703 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1704 return -EINVAL;
1705
1706 if (data[IFLA_GRE_ERSPAN_VER]) {
1707 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1708 if (ver != 1 && ver != 2)
1709 return -EINVAL;
1710 }
1711
1712 if (ver == 1) {
1713 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1714 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1715
1716 if (index & ~INDEX_MASK)
1717 return -EINVAL;
1718 }
1719 } else if (ver == 2) {
1720 if (data[IFLA_GRE_ERSPAN_DIR]) {
1721 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1722
1723 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1724 return -EINVAL;
1725 }
1726
1727 if (data[IFLA_GRE_ERSPAN_HWID]) {
1728 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1729
1730 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1731 return -EINVAL;
1732 }
1733 }
1734
1735 return 0;
1736 }
1737
ip6erspan_set_version(struct nlattr * data[],struct __ip6_tnl_parm * parms)1738 static void ip6erspan_set_version(struct nlattr *data[],
1739 struct __ip6_tnl_parm *parms)
1740 {
1741 if (!data)
1742 return;
1743
1744 parms->erspan_ver = 1;
1745 if (data[IFLA_GRE_ERSPAN_VER])
1746 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1747
1748 if (parms->erspan_ver == 1) {
1749 if (data[IFLA_GRE_ERSPAN_INDEX])
1750 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1751 } else if (parms->erspan_ver == 2) {
1752 if (data[IFLA_GRE_ERSPAN_DIR])
1753 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1754 if (data[IFLA_GRE_ERSPAN_HWID])
1755 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1756 }
1757 }
1758
ip6gre_netlink_parms(struct nlattr * data[],struct __ip6_tnl_parm * parms)1759 static void ip6gre_netlink_parms(struct nlattr *data[],
1760 struct __ip6_tnl_parm *parms)
1761 {
1762 memset(parms, 0, sizeof(*parms));
1763
1764 if (!data)
1765 return;
1766
1767 if (data[IFLA_GRE_LINK])
1768 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1769
1770 if (data[IFLA_GRE_IFLAGS])
1771 gre_flags_to_tnl_flags(parms->i_flags,
1772 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1773
1774 if (data[IFLA_GRE_OFLAGS])
1775 gre_flags_to_tnl_flags(parms->o_flags,
1776 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1777
1778 if (data[IFLA_GRE_IKEY])
1779 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1780
1781 if (data[IFLA_GRE_OKEY])
1782 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1783
1784 if (data[IFLA_GRE_LOCAL])
1785 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1786
1787 if (data[IFLA_GRE_REMOTE])
1788 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1789
1790 if (data[IFLA_GRE_TTL])
1791 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1792
1793 if (data[IFLA_GRE_ENCAP_LIMIT])
1794 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1795
1796 if (data[IFLA_GRE_FLOWINFO])
1797 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1798
1799 if (data[IFLA_GRE_FLAGS])
1800 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1801
1802 if (data[IFLA_GRE_FWMARK])
1803 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1804
1805 if (data[IFLA_GRE_COLLECT_METADATA])
1806 parms->collect_md = true;
1807 }
1808
ip6gre_tap_init(struct net_device * dev)1809 static int ip6gre_tap_init(struct net_device *dev)
1810 {
1811 int ret;
1812
1813 ret = ip6gre_tunnel_init_common(dev);
1814 if (ret)
1815 return ret;
1816
1817 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1818
1819 return 0;
1820 }
1821
1822 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1823 .ndo_init = ip6gre_tap_init,
1824 .ndo_uninit = ip6gre_tunnel_uninit,
1825 .ndo_start_xmit = ip6gre_tunnel_xmit,
1826 .ndo_set_mac_address = eth_mac_addr,
1827 .ndo_validate_addr = eth_validate_addr,
1828 .ndo_change_mtu = ip6_tnl_change_mtu,
1829 .ndo_get_iflink = ip6_tnl_get_iflink,
1830 };
1831
ip6erspan_calc_hlen(struct ip6_tnl * tunnel)1832 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1833 {
1834 int t_hlen;
1835
1836 tunnel->tun_hlen = 8;
1837 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1838 erspan_hdr_len(tunnel->parms.erspan_ver);
1839
1840 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1841 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1842 return t_hlen;
1843 }
1844
ip6erspan_tap_init(struct net_device * dev)1845 static int ip6erspan_tap_init(struct net_device *dev)
1846 {
1847 struct ip6_tnl *tunnel;
1848 int t_hlen;
1849 int ret;
1850
1851 tunnel = netdev_priv(dev);
1852
1853 tunnel->dev = dev;
1854 strscpy(tunnel->parms.name, dev->name);
1855
1856 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1857 if (ret)
1858 return ret;
1859
1860 ret = gro_cells_init(&tunnel->gro_cells, dev);
1861 if (ret)
1862 goto cleanup_dst_cache_init;
1863
1864 t_hlen = ip6erspan_calc_hlen(tunnel);
1865 dev->mtu = ETH_DATA_LEN - t_hlen;
1866 if (dev->type == ARPHRD_ETHER)
1867 dev->mtu -= ETH_HLEN;
1868 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1869 dev->mtu -= 8;
1870
1871 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1872 ip6erspan_tnl_link_config(tunnel, 1);
1873
1874 netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
1875 netdev_lockdep_set_classes(dev);
1876 return 0;
1877
1878 cleanup_dst_cache_init:
1879 dst_cache_destroy(&tunnel->dst_cache);
1880 return ret;
1881 }
1882
1883 static const struct net_device_ops ip6erspan_netdev_ops = {
1884 .ndo_init = ip6erspan_tap_init,
1885 .ndo_uninit = ip6erspan_tunnel_uninit,
1886 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1887 .ndo_set_mac_address = eth_mac_addr,
1888 .ndo_validate_addr = eth_validate_addr,
1889 .ndo_change_mtu = ip6_tnl_change_mtu,
1890 .ndo_get_iflink = ip6_tnl_get_iflink,
1891 };
1892
ip6gre_tap_setup(struct net_device * dev)1893 static void ip6gre_tap_setup(struct net_device *dev)
1894 {
1895
1896 ether_setup(dev);
1897
1898 dev->max_mtu = 0;
1899 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1900 dev->needs_free_netdev = true;
1901 dev->priv_destructor = ip6gre_dev_free;
1902
1903 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
1904 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1905 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1906 netif_keep_dst(dev);
1907 }
1908
ip6gre_netlink_encap_parms(struct nlattr * data[],struct ip_tunnel_encap * ipencap)1909 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1910 struct ip_tunnel_encap *ipencap)
1911 {
1912 bool ret = false;
1913
1914 memset(ipencap, 0, sizeof(*ipencap));
1915
1916 if (!data)
1917 return ret;
1918
1919 if (data[IFLA_GRE_ENCAP_TYPE]) {
1920 ret = true;
1921 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1922 }
1923
1924 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1925 ret = true;
1926 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1927 }
1928
1929 if (data[IFLA_GRE_ENCAP_SPORT]) {
1930 ret = true;
1931 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1932 }
1933
1934 if (data[IFLA_GRE_ENCAP_DPORT]) {
1935 ret = true;
1936 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1937 }
1938
1939 return ret;
1940 }
1941
ip6gre_newlink_common(struct net * link_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1942 static int ip6gre_newlink_common(struct net *link_net, struct net_device *dev,
1943 struct nlattr *tb[], struct nlattr *data[],
1944 struct netlink_ext_ack *extack)
1945 {
1946 struct ip6_tnl *nt;
1947 struct ip_tunnel_encap ipencap;
1948 int err;
1949
1950 nt = netdev_priv(dev);
1951
1952 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1953 int err = ip6_tnl_encap_setup(nt, &ipencap);
1954
1955 if (err < 0)
1956 return err;
1957 }
1958
1959 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1960 eth_hw_addr_random(dev);
1961
1962 nt->dev = dev;
1963 nt->net = link_net;
1964
1965 err = register_netdevice(dev);
1966 if (err)
1967 goto out;
1968
1969 if (tb[IFLA_MTU])
1970 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1971
1972 out:
1973 return err;
1974 }
1975
ip6gre_newlink(struct net_device * dev,struct rtnl_newlink_params * params,struct netlink_ext_ack * extack)1976 static int ip6gre_newlink(struct net_device *dev,
1977 struct rtnl_newlink_params *params,
1978 struct netlink_ext_ack *extack)
1979 {
1980 struct net *net = params->link_net ? : dev_net(dev);
1981 struct ip6_tnl *nt = netdev_priv(dev);
1982 struct nlattr **data = params->data;
1983 struct nlattr **tb = params->tb;
1984 struct ip6gre_net *ign;
1985 int err;
1986
1987 ip6gre_netlink_parms(data, &nt->parms);
1988 ign = net_generic(net, ip6gre_net_id);
1989
1990 if (nt->parms.collect_md) {
1991 if (rtnl_dereference(ign->collect_md_tun))
1992 return -EEXIST;
1993 } else {
1994 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1995 return -EEXIST;
1996 }
1997
1998 err = ip6gre_newlink_common(net, dev, tb, data, extack);
1999 if (!err) {
2000 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
2001 ip6gre_tunnel_link_md(ign, nt);
2002 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2003 }
2004 return err;
2005 }
2006
2007 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)2008 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2009 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2010 struct netlink_ext_ack *extack)
2011 {
2012 struct ip6_tnl *t, *nt = netdev_priv(dev);
2013 struct net *net = nt->net;
2014 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2015 struct ip_tunnel_encap ipencap;
2016
2017 if (dev == ign->fb_tunnel_dev)
2018 return ERR_PTR(-EINVAL);
2019
2020 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2021 int err = ip6_tnl_encap_setup(nt, &ipencap);
2022
2023 if (err < 0)
2024 return ERR_PTR(err);
2025 }
2026
2027 ip6gre_netlink_parms(data, p_p);
2028
2029 t = ip6gre_tunnel_locate(net, p_p, 0);
2030
2031 if (t) {
2032 if (t->dev != dev)
2033 return ERR_PTR(-EEXIST);
2034 } else {
2035 t = nt;
2036 }
2037
2038 return t;
2039 }
2040
ip6gre_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2041 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2042 struct nlattr *data[],
2043 struct netlink_ext_ack *extack)
2044 {
2045 struct ip6_tnl *t = netdev_priv(dev);
2046 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2047 struct __ip6_tnl_parm p;
2048
2049 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2050 if (IS_ERR(t))
2051 return PTR_ERR(t);
2052
2053 ip6gre_tunnel_unlink_md(ign, t);
2054 ip6gre_tunnel_unlink(ign, t);
2055 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2056 ip6gre_tunnel_link_md(ign, t);
2057 ip6gre_tunnel_link(ign, t);
2058 return 0;
2059 }
2060
ip6gre_dellink(struct net_device * dev,struct list_head * head)2061 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2062 {
2063 struct net *net = dev_net(dev);
2064 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2065
2066 if (dev != ign->fb_tunnel_dev)
2067 unregister_netdevice_queue(dev, head);
2068 }
2069
ip6gre_get_size(const struct net_device * dev)2070 static size_t ip6gre_get_size(const struct net_device *dev)
2071 {
2072 return
2073 /* IFLA_GRE_LINK */
2074 nla_total_size(4) +
2075 /* IFLA_GRE_IFLAGS */
2076 nla_total_size(2) +
2077 /* IFLA_GRE_OFLAGS */
2078 nla_total_size(2) +
2079 /* IFLA_GRE_IKEY */
2080 nla_total_size(4) +
2081 /* IFLA_GRE_OKEY */
2082 nla_total_size(4) +
2083 /* IFLA_GRE_LOCAL */
2084 nla_total_size(sizeof(struct in6_addr)) +
2085 /* IFLA_GRE_REMOTE */
2086 nla_total_size(sizeof(struct in6_addr)) +
2087 /* IFLA_GRE_TTL */
2088 nla_total_size(1) +
2089 /* IFLA_GRE_ENCAP_LIMIT */
2090 nla_total_size(1) +
2091 /* IFLA_GRE_FLOWINFO */
2092 nla_total_size(4) +
2093 /* IFLA_GRE_FLAGS */
2094 nla_total_size(4) +
2095 /* IFLA_GRE_ENCAP_TYPE */
2096 nla_total_size(2) +
2097 /* IFLA_GRE_ENCAP_FLAGS */
2098 nla_total_size(2) +
2099 /* IFLA_GRE_ENCAP_SPORT */
2100 nla_total_size(2) +
2101 /* IFLA_GRE_ENCAP_DPORT */
2102 nla_total_size(2) +
2103 /* IFLA_GRE_COLLECT_METADATA */
2104 nla_total_size(0) +
2105 /* IFLA_GRE_FWMARK */
2106 nla_total_size(4) +
2107 /* IFLA_GRE_ERSPAN_INDEX */
2108 nla_total_size(4) +
2109 0;
2110 }
2111
ip6gre_fill_info(struct sk_buff * skb,const struct net_device * dev)2112 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2113 {
2114 struct ip6_tnl *t = netdev_priv(dev);
2115 struct __ip6_tnl_parm *p = &t->parms;
2116 IP_TUNNEL_DECLARE_FLAGS(o_flags);
2117
2118 ip_tunnel_flags_copy(o_flags, p->o_flags);
2119
2120 if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2121 if (!p->collect_md)
2122 __set_bit(IP_TUNNEL_KEY_BIT, o_flags);
2123
2124 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2125 goto nla_put_failure;
2126
2127 if (p->erspan_ver == 1) {
2128 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2129 goto nla_put_failure;
2130 } else {
2131 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2132 goto nla_put_failure;
2133 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2134 goto nla_put_failure;
2135 }
2136 }
2137
2138 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2139 nla_put_be16(skb, IFLA_GRE_IFLAGS,
2140 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2141 nla_put_be16(skb, IFLA_GRE_OFLAGS,
2142 gre_tnl_flags_to_gre_flags(o_flags)) ||
2143 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2144 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2145 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2146 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2147 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2148 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2149 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2150 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2151 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
2152 goto nla_put_failure;
2153
2154 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2155 t->encap.type) ||
2156 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2157 t->encap.sport) ||
2158 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2159 t->encap.dport) ||
2160 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2161 t->encap.flags))
2162 goto nla_put_failure;
2163
2164 if (p->collect_md) {
2165 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2166 goto nla_put_failure;
2167 }
2168
2169 return 0;
2170
2171 nla_put_failure:
2172 return -EMSGSIZE;
2173 }
2174
2175 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2176 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2177 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2178 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2179 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2180 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2181 [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct ipv6hdr, saddr) },
2182 [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct ipv6hdr, daddr) },
2183 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2184 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2185 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2186 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
2187 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2188 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2189 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2190 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
2191 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2192 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
2193 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2194 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2195 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2196 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
2197 };
2198
ip6erspan_tap_setup(struct net_device * dev)2199 static void ip6erspan_tap_setup(struct net_device *dev)
2200 {
2201 ether_setup(dev);
2202
2203 dev->max_mtu = 0;
2204 dev->netdev_ops = &ip6erspan_netdev_ops;
2205 dev->needs_free_netdev = true;
2206 dev->priv_destructor = ip6gre_dev_free;
2207
2208 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
2209 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2210 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2211 netif_keep_dst(dev);
2212 }
2213
ip6erspan_newlink(struct net_device * dev,struct rtnl_newlink_params * params,struct netlink_ext_ack * extack)2214 static int ip6erspan_newlink(struct net_device *dev,
2215 struct rtnl_newlink_params *params,
2216 struct netlink_ext_ack *extack)
2217 {
2218 struct net *net = params->link_net ? : dev_net(dev);
2219 struct ip6_tnl *nt = netdev_priv(dev);
2220 struct nlattr **data = params->data;
2221 struct nlattr **tb = params->tb;
2222 struct ip6gre_net *ign;
2223 int err;
2224
2225 ip6gre_netlink_parms(data, &nt->parms);
2226 ip6erspan_set_version(data, &nt->parms);
2227 ign = net_generic(net, ip6gre_net_id);
2228
2229 if (nt->parms.collect_md) {
2230 if (rtnl_dereference(ign->collect_md_tun_erspan))
2231 return -EEXIST;
2232 } else {
2233 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2234 return -EEXIST;
2235 }
2236
2237 err = ip6gre_newlink_common(net, dev, tb, data, extack);
2238 if (!err) {
2239 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2240 ip6erspan_tunnel_link_md(ign, nt);
2241 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2242 }
2243 return err;
2244 }
2245
ip6erspan_tnl_link_config(struct ip6_tnl * t,int set_mtu)2246 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2247 {
2248 ip6gre_tnl_link_config_common(t);
2249 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2250 }
2251
ip6erspan_tnl_change(struct ip6_tnl * t,const struct __ip6_tnl_parm * p,int set_mtu)2252 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2253 const struct __ip6_tnl_parm *p, int set_mtu)
2254 {
2255 ip6gre_tnl_copy_tnl_parm(t, p);
2256 ip6erspan_tnl_link_config(t, set_mtu);
2257 return 0;
2258 }
2259
ip6erspan_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2260 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2261 struct nlattr *data[],
2262 struct netlink_ext_ack *extack)
2263 {
2264 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2265 struct __ip6_tnl_parm p;
2266 struct ip6_tnl *t;
2267
2268 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2269 if (IS_ERR(t))
2270 return PTR_ERR(t);
2271
2272 ip6erspan_set_version(data, &p);
2273 ip6gre_tunnel_unlink_md(ign, t);
2274 ip6gre_tunnel_unlink(ign, t);
2275 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2276 ip6erspan_tunnel_link_md(ign, t);
2277 ip6gre_tunnel_link(ign, t);
2278 return 0;
2279 }
2280
2281 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2282 .kind = "ip6gre",
2283 .maxtype = IFLA_GRE_MAX,
2284 .policy = ip6gre_policy,
2285 .priv_size = sizeof(struct ip6_tnl),
2286 .setup = ip6gre_tunnel_setup,
2287 .validate = ip6gre_tunnel_validate,
2288 .newlink = ip6gre_newlink,
2289 .changelink = ip6gre_changelink,
2290 .dellink = ip6gre_dellink,
2291 .get_size = ip6gre_get_size,
2292 .fill_info = ip6gre_fill_info,
2293 .get_link_net = ip6_tnl_get_link_net,
2294 };
2295
2296 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2297 .kind = "ip6gretap",
2298 .maxtype = IFLA_GRE_MAX,
2299 .policy = ip6gre_policy,
2300 .priv_size = sizeof(struct ip6_tnl),
2301 .setup = ip6gre_tap_setup,
2302 .validate = ip6gre_tap_validate,
2303 .newlink = ip6gre_newlink,
2304 .changelink = ip6gre_changelink,
2305 .get_size = ip6gre_get_size,
2306 .fill_info = ip6gre_fill_info,
2307 .get_link_net = ip6_tnl_get_link_net,
2308 };
2309
2310 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2311 .kind = "ip6erspan",
2312 .maxtype = IFLA_GRE_MAX,
2313 .policy = ip6gre_policy,
2314 .priv_size = sizeof(struct ip6_tnl),
2315 .setup = ip6erspan_tap_setup,
2316 .validate = ip6erspan_tap_validate,
2317 .newlink = ip6erspan_newlink,
2318 .changelink = ip6erspan_changelink,
2319 .get_size = ip6gre_get_size,
2320 .fill_info = ip6gre_fill_info,
2321 .get_link_net = ip6_tnl_get_link_net,
2322 };
2323
2324 /*
2325 * And now the modules code and kernel interface.
2326 */
2327
ip6gre_init(void)2328 static int __init ip6gre_init(void)
2329 {
2330 int err;
2331
2332 pr_info("GRE over IPv6 tunneling driver\n");
2333
2334 err = register_pernet_device(&ip6gre_net_ops);
2335 if (err < 0)
2336 return err;
2337
2338 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2339 if (err < 0) {
2340 pr_info("%s: can't add protocol\n", __func__);
2341 goto add_proto_failed;
2342 }
2343
2344 err = rtnl_link_register(&ip6gre_link_ops);
2345 if (err < 0)
2346 goto rtnl_link_failed;
2347
2348 err = rtnl_link_register(&ip6gre_tap_ops);
2349 if (err < 0)
2350 goto tap_ops_failed;
2351
2352 err = rtnl_link_register(&ip6erspan_tap_ops);
2353 if (err < 0)
2354 goto erspan_link_failed;
2355
2356 out:
2357 return err;
2358
2359 erspan_link_failed:
2360 rtnl_link_unregister(&ip6gre_tap_ops);
2361 tap_ops_failed:
2362 rtnl_link_unregister(&ip6gre_link_ops);
2363 rtnl_link_failed:
2364 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2365 add_proto_failed:
2366 unregister_pernet_device(&ip6gre_net_ops);
2367 goto out;
2368 }
2369
ip6gre_fini(void)2370 static void __exit ip6gre_fini(void)
2371 {
2372 rtnl_link_unregister(&ip6gre_tap_ops);
2373 rtnl_link_unregister(&ip6gre_link_ops);
2374 rtnl_link_unregister(&ip6erspan_tap_ops);
2375 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2376 unregister_pernet_device(&ip6gre_net_ops);
2377 }
2378
2379 module_init(ip6gre_init);
2380 module_exit(ip6gre_fini);
2381 MODULE_LICENSE("GPL");
2382 MODULE_AUTHOR("D. Kozlov <xeb@mail.ru>");
2383 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2384 MODULE_ALIAS_RTNL_LINK("ip6gre");
2385 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2386 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2387 MODULE_ALIAS_NETDEV("ip6gre0");
2388