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Merge tag 'rproc-v6.14' of git://git.kernel.org/pub/scm/linux/kernel/git/remoteproc...
[linux.git] / net / ipv6 / sit.c
blob39bd8951bfca18e570154dc298f7f8ebdf6208d7
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT)
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
9 *
10 * Changes:
11 * Roger Venning <r.venning@telstra.com>: 6to4 support
12 * Nate Thompson <nate@thebog.net>: 6to4 support
13 * Fred Templin <fred.l.templin@boeing.com>: isatap support
14 */
15
16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
17
18 #include <linux/module.h>
19 #include <linux/capability.h>
20 #include <linux/errno.h>
21 #include <linux/types.h>
22 #include <linux/socket.h>
23 #include <linux/sockios.h>
24 #include <linux/net.h>
25 #include <linux/in6.h>
26 #include <linux/netdevice.h>
27 #include <linux/if_arp.h>
28 #include <linux/icmp.h>
29 #include <linux/slab.h>
30 #include <linux/uaccess.h>
31 #include <linux/init.h>
32 #include <linux/netfilter_ipv4.h>
33 #include <linux/if_ether.h>
34
35 #include <net/sock.h>
36 #include <net/snmp.h>
37
38 #include <net/ipv6.h>
39 #include <net/protocol.h>
40 #include <net/transp_v6.h>
41 #include <net/ip6_fib.h>
42 #include <net/ip6_route.h>
43 #include <net/ndisc.h>
44 #include <net/addrconf.h>
45 #include <net/ip.h>
46 #include <net/udp.h>
47 #include <net/icmp.h>
48 #include <net/ip_tunnels.h>
49 #include <net/inet_ecn.h>
50 #include <net/xfrm.h>
51 #include <net/dsfield.h>
52 #include <net/net_namespace.h>
53 #include <net/netns/generic.h>
54 #include <net/inet_dscp.h>
55
56 /*
57 This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c
58
59 For comments look at net/ipv4/ip_gre.c --ANK
60 */
61
62 #define IP6_SIT_HASH_SIZE 16
63 #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
64
65 static bool log_ecn_error = true;
66 module_param(log_ecn_error, bool, 0644);
67 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
68
69 static int ipip6_tunnel_init(struct net_device *dev);
70 static void ipip6_tunnel_setup(struct net_device *dev);
71 static void ipip6_dev_free(struct net_device *dev);
72 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
73 __be32 *v4dst);
74 static struct rtnl_link_ops sit_link_ops __read_mostly;
75
76 static unsigned int sit_net_id __read_mostly;
77 struct sit_net {
78 struct ip_tunnel __rcu *tunnels_r_l[IP6_SIT_HASH_SIZE];
79 struct ip_tunnel __rcu *tunnels_r[IP6_SIT_HASH_SIZE];
80 struct ip_tunnel __rcu *tunnels_l[IP6_SIT_HASH_SIZE];
81 struct ip_tunnel __rcu *tunnels_wc[1];
82 struct ip_tunnel __rcu **tunnels[4];
83
84 struct net_device *fb_tunnel_dev;
85 };
86
87 static inline struct sit_net *dev_to_sit_net(struct net_device *dev)
88 {
89 struct ip_tunnel *t = netdev_priv(dev);
90
91 return net_generic(t->net, sit_net_id);
92 }
93
94 /*
95 * Must be invoked with rcu_read_lock
96 */
97 static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net,
98 struct net_device *dev,
99 __be32 remote, __be32 local,
100 int sifindex)
101 {
102 unsigned int h0 = HASH(remote);
103 unsigned int h1 = HASH(local);
104 struct ip_tunnel *t;
105 struct sit_net *sitn = net_generic(net, sit_net_id);
106 int ifindex = dev ? dev->ifindex : 0;
107
108 for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) {
109 if (local == t->parms.iph.saddr &&
110 remote == t->parms.iph.daddr &&
111 (!dev || !t->parms.link || ifindex == t->parms.link ||
112 sifindex == t->parms.link) &&
113 (t->dev->flags & IFF_UP))
114 return t;
115 }
116 for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) {
117 if (remote == t->parms.iph.daddr &&
118 (!dev || !t->parms.link || ifindex == t->parms.link ||
119 sifindex == t->parms.link) &&
120 (t->dev->flags & IFF_UP))
121 return t;
122 }
123 for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) {
124 if (local == t->parms.iph.saddr &&
125 (!dev || !t->parms.link || ifindex == t->parms.link ||
126 sifindex == t->parms.link) &&
127 (t->dev->flags & IFF_UP))
128 return t;
129 }
130 t = rcu_dereference(sitn->tunnels_wc[0]);
131 if (t && (t->dev->flags & IFF_UP))
132 return t;
133 return NULL;
134 }
135
136 static struct ip_tunnel __rcu **
137 __ipip6_bucket(struct sit_net *sitn, struct ip_tunnel_parm_kern *parms)
138 {
139 __be32 remote = parms->iph.daddr;
140 __be32 local = parms->iph.saddr;
141 unsigned int h = 0;
142 int prio = 0;
143
144 if (remote) {
145 prio |= 2;
146 h ^= HASH(remote);
147 }
148 if (local) {
149 prio |= 1;
150 h ^= HASH(local);
151 }
152 return &sitn->tunnels[prio][h];
153 }
154
155 static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn,
156 struct ip_tunnel *t)
157 {
158 return __ipip6_bucket(sitn, &t->parms);
159 }
160
161 static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t)
162 {
163 struct ip_tunnel __rcu **tp;
164 struct ip_tunnel *iter;
165
166 for (tp = ipip6_bucket(sitn, t);
167 (iter = rtnl_dereference(*tp)) != NULL;
168 tp = &iter->next) {
169 if (t == iter) {
170 rcu_assign_pointer(*tp, t->next);
171 break;
172 }
173 }
174 }
175
176 static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t)
177 {
178 struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t);
179
180 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
181 rcu_assign_pointer(*tp, t);
182 }
183
184 static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn)
185 {
186 #ifdef CONFIG_IPV6_SIT_6RD
187 struct ip_tunnel *t = netdev_priv(dev);
188
189 if (dev == sitn->fb_tunnel_dev || !sitn->fb_tunnel_dev) {
190 ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0);
191 t->ip6rd.relay_prefix = 0;
192 t->ip6rd.prefixlen = 16;
193 t->ip6rd.relay_prefixlen = 0;
194 } else {
195 struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev);
196 memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd));
197 }
198 #endif
199 }
200
201 static int ipip6_tunnel_create(struct net_device *dev)
202 {
203 struct ip_tunnel *t = netdev_priv(dev);
204 struct net *net = dev_net(dev);
205 struct sit_net *sitn = net_generic(net, sit_net_id);
206 int err;
207
208 __dev_addr_set(dev, &t->parms.iph.saddr, 4);
209 memcpy(dev->broadcast, &t->parms.iph.daddr, 4);
210
211 if (test_bit(IP_TUNNEL_SIT_ISATAP_BIT, t->parms.i_flags))
212 dev->priv_flags |= IFF_ISATAP;
213
214 dev->rtnl_link_ops = &sit_link_ops;
215
216 err = register_netdevice(dev);
217 if (err < 0)
218 goto out;
219
220 ipip6_tunnel_clone_6rd(dev, sitn);
221
222 ipip6_tunnel_link(sitn, t);
223 return 0;
224
225 out:
226 return err;
227 }
228
229 static struct ip_tunnel *ipip6_tunnel_locate(struct net *net,
230 struct ip_tunnel_parm_kern *parms,
231 int create)
232 {
233 __be32 remote = parms->iph.daddr;
234 __be32 local = parms->iph.saddr;
235 struct ip_tunnel *t, *nt;
236 struct ip_tunnel __rcu **tp;
237 struct net_device *dev;
238 char name[IFNAMSIZ];
239 struct sit_net *sitn = net_generic(net, sit_net_id);
240
241 for (tp = __ipip6_bucket(sitn, parms);
242 (t = rtnl_dereference(*tp)) != NULL;
243 tp = &t->next) {
244 if (local == t->parms.iph.saddr &&
245 remote == t->parms.iph.daddr &&
246 parms->link == t->parms.link) {
247 if (create)
248 return NULL;
249 else
250 return t;
251 }
252 }
253 if (!create)
254 goto failed;
255
256 if (parms->name[0]) {
257 if (!dev_valid_name(parms->name))
258 goto failed;
259 strscpy(name, parms->name, IFNAMSIZ);
260 } else {
261 strcpy(name, "sit%d");
262 }
263 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
264 ipip6_tunnel_setup);
265 if (!dev)
266 return NULL;
267
268 dev_net_set(dev, net);
269
270 nt = netdev_priv(dev);
271
272 nt->parms = *parms;
273 if (ipip6_tunnel_create(dev) < 0)
274 goto failed_free;
275
276 if (!parms->name[0])
277 strcpy(parms->name, dev->name);
278
279 return nt;
280
281 failed_free:
282 free_netdev(dev);
283 failed:
284 return NULL;
285 }
286
287 #define for_each_prl_rcu(start) \
288 for (prl = rcu_dereference(start); \
289 prl; \
290 prl = rcu_dereference(prl->next))
291
292 static struct ip_tunnel_prl_entry *
293 __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
294 {
295 struct ip_tunnel_prl_entry *prl;
296
297 for_each_prl_rcu(t->prl)
298 if (prl->addr == addr)
299 break;
300 return prl;
301
302 }
303
304 static int ipip6_tunnel_get_prl(struct net_device *dev, struct ip_tunnel_prl __user *a)
305 {
306 struct ip_tunnel *t = netdev_priv(dev);
307 struct ip_tunnel_prl kprl, *kp;
308 struct ip_tunnel_prl_entry *prl;
309 unsigned int cmax, c = 0, ca, len;
310 int ret = 0;
311
312 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev)
313 return -EINVAL;
314
315 if (copy_from_user(&kprl, a, sizeof(kprl)))
316 return -EFAULT;
317 cmax = kprl.datalen / sizeof(kprl);
318 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY))
319 cmax = 1;
320
321 /* For simple GET or for root users,
322 * we try harder to allocate.
323 */
324 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
325 kcalloc(cmax, sizeof(*kp), GFP_KERNEL_ACCOUNT | __GFP_NOWARN) :
326 NULL;
327
328 ca = min(t->prl_count, cmax);
329
330 if (!kp) {
331 /* We don't try hard to allocate much memory for
332 * non-root users.
333 * For root users, retry allocating enough memory for
334 * the answer.
335 */
336 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC | __GFP_ACCOUNT |
337 __GFP_NOWARN);
338 if (!kp) {
339 ret = -ENOMEM;
340 goto out;
341 }
342 }
343
344 rcu_read_lock();
345 for_each_prl_rcu(t->prl) {
346 if (c >= cmax)
347 break;
348 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr)
349 continue;
350 kp[c].addr = prl->addr;
351 kp[c].flags = prl->flags;
352 c++;
353 if (kprl.addr != htonl(INADDR_ANY))
354 break;
355 }
356
357 rcu_read_unlock();
358
359 len = sizeof(*kp) * c;
360 ret = 0;
361 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen))
362 ret = -EFAULT;
363
364 kfree(kp);
365 out:
366 return ret;
367 }
368
369 static int
370 ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
371 {
372 struct ip_tunnel_prl_entry *p;
373 int err = 0;
374
375 if (a->addr == htonl(INADDR_ANY))
376 return -EINVAL;
377
378 ASSERT_RTNL();
379
380 for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) {
381 if (p->addr == a->addr) {
382 if (chg) {
383 p->flags = a->flags;
384 goto out;
385 }
386 err = -EEXIST;
387 goto out;
388 }
389 }
390
391 if (chg) {
392 err = -ENXIO;
393 goto out;
394 }
395
396 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
397 if (!p) {
398 err = -ENOBUFS;
399 goto out;
400 }
401
402 p->next = t->prl;
403 p->addr = a->addr;
404 p->flags = a->flags;
405 t->prl_count++;
406 rcu_assign_pointer(t->prl, p);
407 out:
408 return err;
409 }
410
411 static void prl_list_destroy_rcu(struct rcu_head *head)
412 {
413 struct ip_tunnel_prl_entry *p, *n;
414
415 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head);
416 do {
417 n = rcu_dereference_protected(p->next, 1);
418 kfree(p);
419 p = n;
420 } while (p);
421 }
422
423 static int
424 ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
425 {
426 struct ip_tunnel_prl_entry *x;
427 struct ip_tunnel_prl_entry __rcu **p;
428 int err = 0;
429
430 ASSERT_RTNL();
431
432 if (a && a->addr != htonl(INADDR_ANY)) {
433 for (p = &t->prl;
434 (x = rtnl_dereference(*p)) != NULL;
435 p = &x->next) {
436 if (x->addr == a->addr) {
437 *p = x->next;
438 kfree_rcu(x, rcu_head);
439 t->prl_count--;
440 goto out;
441 }
442 }
443 err = -ENXIO;
444 } else {
445 x = rtnl_dereference(t->prl);
446 if (x) {
447 t->prl_count = 0;
448 call_rcu(&x->rcu_head, prl_list_destroy_rcu);
449 t->prl = NULL;
450 }
451 }
452 out:
453 return err;
454 }
455
456 static int ipip6_tunnel_prl_ctl(struct net_device *dev,
457 struct ip_tunnel_prl __user *data, int cmd)
458 {
459 struct ip_tunnel *t = netdev_priv(dev);
460 struct ip_tunnel_prl prl;
461 int err;
462
463 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN))
464 return -EPERM;
465 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev)
466 return -EINVAL;
467
468 if (copy_from_user(&prl, data, sizeof(prl)))
469 return -EFAULT;
470
471 switch (cmd) {
472 case SIOCDELPRL:
473 err = ipip6_tunnel_del_prl(t, &prl);
474 break;
475 case SIOCADDPRL:
476 case SIOCCHGPRL:
477 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
478 break;
479 }
480 dst_cache_reset(&t->dst_cache);
481 netdev_state_change(dev);
482 return err;
483 }
484
485 static int
486 isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t)
487 {
488 struct ip_tunnel_prl_entry *p;
489 int ok = 1;
490
491 rcu_read_lock();
492 p = __ipip6_tunnel_locate_prl(t, iph->saddr);
493 if (p) {
494 if (p->flags & PRL_DEFAULT)
495 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
496 else
497 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
498 } else {
499 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
500
501 if (ipv6_addr_is_isatap(addr6) &&
502 (addr6->s6_addr32[3] == iph->saddr) &&
503 ipv6_chk_prefix(addr6, t->dev))
504 skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
505 else
506 ok = 0;
507 }
508 rcu_read_unlock();
509 return ok;
510 }
511
512 static void ipip6_tunnel_uninit(struct net_device *dev)
513 {
514 struct ip_tunnel *tunnel = netdev_priv(dev);
515 struct sit_net *sitn = net_generic(tunnel->net, sit_net_id);
516
517 if (dev == sitn->fb_tunnel_dev) {
518 RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL);
519 } else {
520 ipip6_tunnel_unlink(sitn, tunnel);
521 ipip6_tunnel_del_prl(tunnel, NULL);
522 }
523 dst_cache_reset(&tunnel->dst_cache);
524 netdev_put(dev, &tunnel->dev_tracker);
525 }
526
527 static int ipip6_err(struct sk_buff *skb, u32 info)
528 {
529 const struct iphdr *iph = (const struct iphdr *)skb->data;
530 const int type = icmp_hdr(skb)->type;
531 const int code = icmp_hdr(skb)->code;
532 unsigned int data_len = 0;
533 struct ip_tunnel *t;
534 int sifindex;
535 int err;
536
537 switch (type) {
538 default:
539 case ICMP_PARAMETERPROB:
540 return 0;
541
542 case ICMP_DEST_UNREACH:
543 switch (code) {
544 case ICMP_SR_FAILED:
545 /* Impossible event. */
546 return 0;
547 default:
548 /* All others are translated to HOST_UNREACH.
549 rfc2003 contains "deep thoughts" about NET_UNREACH,
550 I believe they are just ether pollution. --ANK
551 */
552 break;
553 }
554 break;
555 case ICMP_TIME_EXCEEDED:
556 if (code != ICMP_EXC_TTL)
557 return 0;
558 data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */
559 break;
560 case ICMP_REDIRECT:
561 break;
562 }
563
564 err = -ENOENT;
565
566 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0;
567 t = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
568 iph->daddr, iph->saddr, sifindex);
569 if (!t)
570 goto out;
571
572 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
573 ipv4_update_pmtu(skb, dev_net(skb->dev), info,
574 t->parms.link, iph->protocol);
575 err = 0;
576 goto out;
577 }
578 if (type == ICMP_REDIRECT) {
579 ipv4_redirect(skb, dev_net(skb->dev), t->parms.link,
580 iph->protocol);
581 err = 0;
582 goto out;
583 }
584
585 err = 0;
586 if (__in6_dev_get(skb->dev) &&
587 !ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4, type, data_len))
588 goto out;
589
590 if (t->parms.iph.daddr == 0)
591 goto out;
592
593 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
594 goto out;
595
596 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
597 t->err_count++;
598 else
599 t->err_count = 1;
600 t->err_time = jiffies;
601 out:
602 return err;
603 }
604
605 static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr,
606 const struct in6_addr *v6addr)
607 {
608 __be32 v4embed = 0;
609 if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed)
610 return true;
611 return false;
612 }
613
614 /* Checks if an address matches an address on the tunnel interface.
615 * Used to detect the NAT of proto 41 packets and let them pass spoofing test.
616 * Long story:
617 * This function is called after we considered the packet as spoofed
618 * in is_spoofed_6rd.
619 * We may have a router that is doing NAT for proto 41 packets
620 * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb
621 * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd
622 * function will return true, dropping the packet.
623 * But, we can still check if is spoofed against the IP
624 * addresses associated with the interface.
625 */
626 static bool only_dnatted(const struct ip_tunnel *tunnel,
627 const struct in6_addr *v6dst)
628 {
629 int prefix_len;
630
631 #ifdef CONFIG_IPV6_SIT_6RD
632 prefix_len = tunnel->ip6rd.prefixlen + 32
633 - tunnel->ip6rd.relay_prefixlen;
634 #else
635 prefix_len = 48;
636 #endif
637 return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev);
638 }
639
640 /* Returns true if a packet is spoofed */
641 static bool packet_is_spoofed(struct sk_buff *skb,
642 const struct iphdr *iph,
643 struct ip_tunnel *tunnel)
644 {
645 const struct ipv6hdr *ipv6h;
646
647 if (tunnel->dev->priv_flags & IFF_ISATAP) {
648 if (!isatap_chksrc(skb, iph, tunnel))
649 return true;
650
651 return false;
652 }
653
654 if (tunnel->dev->flags & IFF_POINTOPOINT)
655 return false;
656
657 ipv6h = ipv6_hdr(skb);
658
659 if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) {
660 net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
661 &iph->saddr, &ipv6h->saddr,
662 &iph->daddr, &ipv6h->daddr);
663 return true;
664 }
665
666 if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr)))
667 return false;
668
669 if (only_dnatted(tunnel, &ipv6h->daddr))
670 return false;
671
672 net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
673 &iph->saddr, &ipv6h->saddr,
674 &iph->daddr, &ipv6h->daddr);
675 return true;
676 }
677
678 static int ipip6_rcv(struct sk_buff *skb)
679 {
680 const struct iphdr *iph = ip_hdr(skb);
681 struct ip_tunnel *tunnel;
682 int sifindex;
683 int err;
684
685 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0;
686 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
687 iph->saddr, iph->daddr, sifindex);
688 if (tunnel) {
689 if (tunnel->parms.iph.protocol != IPPROTO_IPV6 &&
690 tunnel->parms.iph.protocol != 0)
691 goto out;
692
693 skb->mac_header = skb->network_header;
694 skb_reset_network_header(skb);
695 IPCB(skb)->flags = 0;
696 skb->dev = tunnel->dev;
697
698 if (packet_is_spoofed(skb, iph, tunnel)) {
699 DEV_STATS_INC(tunnel->dev, rx_errors);
700 goto out;
701 }
702
703 if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6),
704 !net_eq(tunnel->net, dev_net(tunnel->dev))))
705 goto out;
706
707 /* skb can be uncloned in iptunnel_pull_header, so
708 * old iph is no longer valid
709 */
710 iph = (const struct iphdr *)skb_mac_header(skb);
711 skb_reset_mac_header(skb);
712
713 err = IP_ECN_decapsulate(iph, skb);
714 if (unlikely(err)) {
715 if (log_ecn_error)
716 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
717 &iph->saddr, iph->tos);
718 if (err > 1) {
719 DEV_STATS_INC(tunnel->dev, rx_frame_errors);
720 DEV_STATS_INC(tunnel->dev, rx_errors);
721 goto out;
722 }
723 }
724
725 dev_sw_netstats_rx_add(tunnel->dev, skb->len);
726
727 netif_rx(skb);
728
729 return 0;
730 }
731
732 /* no tunnel matched, let upstream know, ipsec may handle it */
733 return 1;
734 out:
735 kfree_skb(skb);
736 return 0;
737 }
738
739 static const struct tnl_ptk_info ipip_tpi = {
740 /* no tunnel info required for ipip. */
741 .proto = htons(ETH_P_IP),
742 };
743
744 #if IS_ENABLED(CONFIG_MPLS)
745 static const struct tnl_ptk_info mplsip_tpi = {
746 /* no tunnel info required for mplsip. */
747 .proto = htons(ETH_P_MPLS_UC),
748 };
749 #endif
750
751 static int sit_tunnel_rcv(struct sk_buff *skb, u8 ipproto)
752 {
753 const struct iphdr *iph;
754 struct ip_tunnel *tunnel;
755 int sifindex;
756
757 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0;
758
759 iph = ip_hdr(skb);
760 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
761 iph->saddr, iph->daddr, sifindex);
762 if (tunnel) {
763 const struct tnl_ptk_info *tpi;
764
765 if (tunnel->parms.iph.protocol != ipproto &&
766 tunnel->parms.iph.protocol != 0)
767 goto drop;
768
769 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
770 goto drop;
771 #if IS_ENABLED(CONFIG_MPLS)
772 if (ipproto == IPPROTO_MPLS)
773 tpi = &mplsip_tpi;
774 else
775 #endif
776 tpi = &ipip_tpi;
777 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
778 goto drop;
779 skb_reset_mac_header(skb);
780
781 return ip_tunnel_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
782 }
783
784 return 1;
785
786 drop:
787 kfree_skb(skb);
788 return 0;
789 }
790
791 static int ipip_rcv(struct sk_buff *skb)
792 {
793 return sit_tunnel_rcv(skb, IPPROTO_IPIP);
794 }
795
796 #if IS_ENABLED(CONFIG_MPLS)
797 static int mplsip_rcv(struct sk_buff *skb)
798 {
799 return sit_tunnel_rcv(skb, IPPROTO_MPLS);
800 }
801 #endif
802
803 /*
804 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function
805 * stores the embedded IPv4 address in v4dst and returns true.
806 */
807 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
808 __be32 *v4dst)
809 {
810 #ifdef CONFIG_IPV6_SIT_6RD
811 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix,
812 tunnel->ip6rd.prefixlen)) {
813 unsigned int pbw0, pbi0;
814 int pbi1;
815 u32 d;
816
817 pbw0 = tunnel->ip6rd.prefixlen >> 5;
818 pbi0 = tunnel->ip6rd.prefixlen & 0x1f;
819
820 d = tunnel->ip6rd.relay_prefixlen < 32 ?
821 (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
822 tunnel->ip6rd.relay_prefixlen : 0;
823
824 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;
825 if (pbi1 > 0)
826 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >>
827 (32 - pbi1);
828
829 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d);
830 return true;
831 }
832 #else
833 if (v6dst->s6_addr16[0] == htons(0x2002)) {
834 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
835 memcpy(v4dst, &v6dst->s6_addr16[1], 4);
836 return true;
837 }
838 #endif
839 return false;
840 }
841
842 static inline __be32 try_6rd(struct ip_tunnel *tunnel,
843 const struct in6_addr *v6dst)
844 {
845 __be32 dst = 0;
846 check_6rd(tunnel, v6dst, &dst);
847 return dst;
848 }
849
850 /*
851 * This function assumes it is being called from dev_queue_xmit()
852 * and that skb is filled properly by that function.
853 */
854
855 static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
856 struct net_device *dev)
857 {
858 struct ip_tunnel *tunnel = netdev_priv(dev);
859 const struct iphdr *tiph = &tunnel->parms.iph;
860 const struct ipv6hdr *iph6 = ipv6_hdr(skb);
861 u8 tos = tunnel->parms.iph.tos;
862 __be16 df = tiph->frag_off;
863 struct rtable *rt; /* Route to the other host */
864 struct net_device *tdev; /* Device to other host */
865 unsigned int max_headroom; /* The extra header space needed */
866 __be32 dst = tiph->daddr;
867 struct flowi4 fl4;
868 int mtu;
869 const struct in6_addr *addr6;
870 int addr_type;
871 u8 ttl;
872 u8 protocol = IPPROTO_IPV6;
873 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
874
875 if (tos == 1)
876 tos = ipv6_get_dsfield(iph6);
877
878 /* ISATAP (RFC4214) - must come before 6to4 */
879 if (dev->priv_flags & IFF_ISATAP) {
880 struct neighbour *neigh = NULL;
881 bool do_tx_error = false;
882
883 if (skb_dst(skb))
884 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
885
886 if (!neigh) {
887 net_dbg_ratelimited("nexthop == NULL\n");
888 goto tx_error;
889 }
890
891 addr6 = (const struct in6_addr *)&neigh->primary_key;
892 addr_type = ipv6_addr_type(addr6);
893
894 if ((addr_type & IPV6_ADDR_UNICAST) &&
895 ipv6_addr_is_isatap(addr6))
896 dst = addr6->s6_addr32[3];
897 else
898 do_tx_error = true;
899
900 neigh_release(neigh);
901 if (do_tx_error)
902 goto tx_error;
903 }
904
905 if (!dst)
906 dst = try_6rd(tunnel, &iph6->daddr);
907
908 if (!dst) {
909 struct neighbour *neigh = NULL;
910 bool do_tx_error = false;
911
912 if (skb_dst(skb))
913 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
914
915 if (!neigh) {
916 net_dbg_ratelimited("nexthop == NULL\n");
917 goto tx_error;
918 }
919
920 addr6 = (const struct in6_addr *)&neigh->primary_key;
921 addr_type = ipv6_addr_type(addr6);
922
923 if (addr_type == IPV6_ADDR_ANY) {
924 addr6 = &ipv6_hdr(skb)->daddr;
925 addr_type = ipv6_addr_type(addr6);
926 }
927
928 if ((addr_type & IPV6_ADDR_COMPATv4) != 0)
929 dst = addr6->s6_addr32[3];
930 else
931 do_tx_error = true;
932
933 neigh_release(neigh);
934 if (do_tx_error)
935 goto tx_error;
936 }
937
938 flowi4_init_output(&fl4, tunnel->parms.link, tunnel->fwmark,
939 tos & INET_DSCP_MASK, RT_SCOPE_UNIVERSE,
940 IPPROTO_IPV6, 0, dst, tiph->saddr, 0, 0,
941 sock_net_uid(tunnel->net, NULL));
942
943 rt = dst_cache_get_ip4(&tunnel->dst_cache, &fl4.saddr);
944 if (!rt) {
945 rt = ip_route_output_flow(tunnel->net, &fl4, NULL);
946 if (IS_ERR(rt)) {
947 DEV_STATS_INC(dev, tx_carrier_errors);
948 goto tx_error_icmp;
949 }
950 dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst, fl4.saddr);
951 }
952
953 if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
954 ip_rt_put(rt);
955 DEV_STATS_INC(dev, tx_carrier_errors);
956 goto tx_error_icmp;
957 }
958 tdev = rt->dst.dev;
959
960 if (tdev == dev) {
961 ip_rt_put(rt);
962 DEV_STATS_INC(dev, collisions);
963 goto tx_error;
964 }
965
966 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) {
967 ip_rt_put(rt);
968 goto tx_error;
969 }
970
971 if (df) {
972 mtu = dst_mtu(&rt->dst) - t_hlen;
973
974 if (mtu < IPV4_MIN_MTU) {
975 DEV_STATS_INC(dev, collisions);
976 ip_rt_put(rt);
977 goto tx_error;
978 }
979
980 if (mtu < IPV6_MIN_MTU) {
981 mtu = IPV6_MIN_MTU;
982 df = 0;
983 }
984
985 if (tunnel->parms.iph.daddr)
986 skb_dst_update_pmtu_no_confirm(skb, mtu);
987
988 if (skb->len > mtu && !skb_is_gso(skb)) {
989 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
990 ip_rt_put(rt);
991 goto tx_error;
992 }
993 }
994
995 if (tunnel->err_count > 0) {
996 if (time_before(jiffies,
997 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
998 tunnel->err_count--;
999 dst_link_failure(skb);
1000 } else
1001 tunnel->err_count = 0;
1002 }
1003
1004 /*
1005 * Okay, now see if we can stuff it in the buffer as-is.
1006 */
1007 max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen;
1008
1009 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1010 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
1011 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
1012 if (!new_skb) {
1013 ip_rt_put(rt);
1014 DEV_STATS_INC(dev, tx_dropped);
1015 kfree_skb(skb);
1016 return NETDEV_TX_OK;
1017 }
1018 if (skb->sk)
1019 skb_set_owner_w(new_skb, skb->sk);
1020 dev_kfree_skb(skb);
1021 skb = new_skb;
1022 iph6 = ipv6_hdr(skb);
1023 }
1024 ttl = tiph->ttl;
1025 if (ttl == 0)
1026 ttl = iph6->hop_limit;
1027 tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
1028
1029 if (ip_tunnel_encap(skb, &tunnel->encap, &protocol, &fl4) < 0) {
1030 ip_rt_put(rt);
1031 goto tx_error;
1032 }
1033
1034 skb_set_inner_ipproto(skb, IPPROTO_IPV6);
1035
1036 iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl,
1037 df, !net_eq(tunnel->net, dev_net(dev)));
1038 return NETDEV_TX_OK;
1039
1040 tx_error_icmp:
1041 dst_link_failure(skb);
1042 tx_error:
1043 kfree_skb(skb);
1044 DEV_STATS_INC(dev, tx_errors);
1045 return NETDEV_TX_OK;
1046 }
1047
1048 static netdev_tx_t sit_tunnel_xmit__(struct sk_buff *skb,
1049 struct net_device *dev, u8 ipproto)
1050 {
1051 struct ip_tunnel *tunnel = netdev_priv(dev);
1052 const struct iphdr *tiph = &tunnel->parms.iph;
1053
1054 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4))
1055 goto tx_error;
1056
1057 skb_set_inner_ipproto(skb, ipproto);
1058
1059 ip_tunnel_xmit(skb, dev, tiph, ipproto);
1060 return NETDEV_TX_OK;
1061 tx_error:
1062 kfree_skb(skb);
1063 DEV_STATS_INC(dev, tx_errors);
1064 return NETDEV_TX_OK;
1065 }
1066
1067 static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb,
1068 struct net_device *dev)
1069 {
1070 if (!pskb_inet_may_pull(skb))
1071 goto tx_err;
1072
1073 switch (skb->protocol) {
1074 case htons(ETH_P_IP):
1075 sit_tunnel_xmit__(skb, dev, IPPROTO_IPIP);
1076 break;
1077 case htons(ETH_P_IPV6):
1078 ipip6_tunnel_xmit(skb, dev);
1079 break;
1080 #if IS_ENABLED(CONFIG_MPLS)
1081 case htons(ETH_P_MPLS_UC):
1082 sit_tunnel_xmit__(skb, dev, IPPROTO_MPLS);
1083 break;
1084 #endif
1085 default:
1086 goto tx_err;
1087 }
1088
1089 return NETDEV_TX_OK;
1090
1091 tx_err:
1092 DEV_STATS_INC(dev, tx_errors);
1093 kfree_skb(skb);
1094 return NETDEV_TX_OK;
1095
1096 }
1097
1098 static void ipip6_tunnel_bind_dev(struct net_device *dev)
1099 {
1100 struct ip_tunnel *tunnel = netdev_priv(dev);
1101 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
1102 struct net_device *tdev = NULL;
1103 int hlen = LL_MAX_HEADER;
1104 const struct iphdr *iph;
1105 struct flowi4 fl4;
1106
1107 iph = &tunnel->parms.iph;
1108
1109 if (iph->daddr) {
1110 struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4,
1111 NULL,
1112 iph->daddr, iph->saddr,
1113 0, 0,
1114 IPPROTO_IPV6,
1115 iph->tos & INET_DSCP_MASK,
1116 tunnel->parms.link);
1117
1118 if (!IS_ERR(rt)) {
1119 tdev = rt->dst.dev;
1120 ip_rt_put(rt);
1121 }
1122 dev->flags |= IFF_POINTOPOINT;
1123 }
1124
1125 if (!tdev && tunnel->parms.link)
1126 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link);
1127
1128 if (tdev && !netif_is_l3_master(tdev)) {
1129 int mtu;
1130
1131 mtu = tdev->mtu - t_hlen;
1132 if (mtu < IPV6_MIN_MTU)
1133 mtu = IPV6_MIN_MTU;
1134 WRITE_ONCE(dev->mtu, mtu);
1135 hlen = tdev->hard_header_len + tdev->needed_headroom;
1136 }
1137 dev->needed_headroom = t_hlen + hlen;
1138 }
1139
1140 static void ipip6_tunnel_update(struct ip_tunnel *t,
1141 struct ip_tunnel_parm_kern *p,
1142 __u32 fwmark)
1143 {
1144 struct net *net = t->net;
1145 struct sit_net *sitn = net_generic(net, sit_net_id);
1146
1147 ipip6_tunnel_unlink(sitn, t);
1148 synchronize_net();
1149 t->parms.iph.saddr = p->iph.saddr;
1150 t->parms.iph.daddr = p->iph.daddr;
1151 __dev_addr_set(t->dev, &p->iph.saddr, 4);
1152 memcpy(t->dev->broadcast, &p->iph.daddr, 4);
1153 ipip6_tunnel_link(sitn, t);
1154 t->parms.iph.ttl = p->iph.ttl;
1155 t->parms.iph.tos = p->iph.tos;
1156 t->parms.iph.frag_off = p->iph.frag_off;
1157 if (t->parms.link != p->link || t->fwmark != fwmark) {
1158 t->parms.link = p->link;
1159 t->fwmark = fwmark;
1160 ipip6_tunnel_bind_dev(t->dev);
1161 }
1162 dst_cache_reset(&t->dst_cache);
1163 netdev_state_change(t->dev);
1164 }
1165
1166 #ifdef CONFIG_IPV6_SIT_6RD
1167 static int ipip6_tunnel_update_6rd(struct ip_tunnel *t,
1168 struct ip_tunnel_6rd *ip6rd)
1169 {
1170 struct in6_addr prefix;
1171 __be32 relay_prefix;
1172
1173 if (ip6rd->relay_prefixlen > 32 ||
1174 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64)
1175 return -EINVAL;
1176
1177 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen);
1178 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix))
1179 return -EINVAL;
1180 if (ip6rd->relay_prefixlen)
1181 relay_prefix = ip6rd->relay_prefix &
1182 htonl(0xffffffffUL <<
1183 (32 - ip6rd->relay_prefixlen));
1184 else
1185 relay_prefix = 0;
1186 if (relay_prefix != ip6rd->relay_prefix)
1187 return -EINVAL;
1188
1189 t->ip6rd.prefix = prefix;
1190 t->ip6rd.relay_prefix = relay_prefix;
1191 t->ip6rd.prefixlen = ip6rd->prefixlen;
1192 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen;
1193 dst_cache_reset(&t->dst_cache);
1194 netdev_state_change(t->dev);
1195 return 0;
1196 }
1197
1198 static int
1199 ipip6_tunnel_get6rd(struct net_device *dev, struct ip_tunnel_parm __user *data)
1200 {
1201 struct ip_tunnel *t = netdev_priv(dev);
1202 struct ip_tunnel_parm_kern p;
1203 struct ip_tunnel_6rd ip6rd;
1204
1205 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) {
1206 if (!ip_tunnel_parm_from_user(&p, data))
1207 return -EFAULT;
1208 t = ipip6_tunnel_locate(t->net, &p, 0);
1209 }
1210 if (!t)
1211 t = netdev_priv(dev);
1212
1213 ip6rd.prefix = t->ip6rd.prefix;
1214 ip6rd.relay_prefix = t->ip6rd.relay_prefix;
1215 ip6rd.prefixlen = t->ip6rd.prefixlen;
1216 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;
1217 if (copy_to_user(data, &ip6rd, sizeof(ip6rd)))
1218 return -EFAULT;
1219 return 0;
1220 }
1221
1222 static int
1223 ipip6_tunnel_6rdctl(struct net_device *dev, struct ip_tunnel_6rd __user *data,
1224 int cmd)
1225 {
1226 struct ip_tunnel *t = netdev_priv(dev);
1227 struct ip_tunnel_6rd ip6rd;
1228 int err;
1229
1230 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN))
1231 return -EPERM;
1232 if (copy_from_user(&ip6rd, data, sizeof(ip6rd)))
1233 return -EFAULT;
1234
1235 if (cmd != SIOCDEL6RD) {
1236 err = ipip6_tunnel_update_6rd(t, &ip6rd);
1237 if (err < 0)
1238 return err;
1239 } else
1240 ipip6_tunnel_clone_6rd(dev, dev_to_sit_net(dev));
1241 return 0;
1242 }
1243
1244 #endif /* CONFIG_IPV6_SIT_6RD */
1245
1246 static bool ipip6_valid_ip_proto(u8 ipproto)
1247 {
1248 return ipproto == IPPROTO_IPV6 ||
1249 ipproto == IPPROTO_IPIP ||
1250 #if IS_ENABLED(CONFIG_MPLS)
1251 ipproto == IPPROTO_MPLS ||
1252 #endif
1253 ipproto == 0;
1254 }
1255
1256 static int
1257 __ipip6_tunnel_ioctl_validate(struct net *net, struct ip_tunnel_parm_kern *p)
1258 {
1259 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1260 return -EPERM;
1261
1262 if (!ipip6_valid_ip_proto(p->iph.protocol))
1263 return -EINVAL;
1264 if (p->iph.version != 4 ||
1265 p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF)))
1266 return -EINVAL;
1267
1268 if (p->iph.ttl)
1269 p->iph.frag_off |= htons(IP_DF);
1270 return 0;
1271 }
1272
1273 static int
1274 ipip6_tunnel_get(struct net_device *dev, struct ip_tunnel_parm_kern *p)
1275 {
1276 struct ip_tunnel *t = netdev_priv(dev);
1277
1278 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev)
1279 t = ipip6_tunnel_locate(t->net, p, 0);
1280 if (!t)
1281 t = netdev_priv(dev);
1282 memcpy(p, &t->parms, sizeof(*p));
1283 return 0;
1284 }
1285
1286 static int
1287 ipip6_tunnel_add(struct net_device *dev, struct ip_tunnel_parm_kern *p)
1288 {
1289 struct ip_tunnel *t = netdev_priv(dev);
1290 int err;
1291
1292 err = __ipip6_tunnel_ioctl_validate(t->net, p);
1293 if (err)
1294 return err;
1295
1296 t = ipip6_tunnel_locate(t->net, p, 1);
1297 if (!t)
1298 return -ENOBUFS;
1299 return 0;
1300 }
1301
1302 static int
1303 ipip6_tunnel_change(struct net_device *dev, struct ip_tunnel_parm_kern *p)
1304 {
1305 struct ip_tunnel *t = netdev_priv(dev);
1306 int err;
1307
1308 err = __ipip6_tunnel_ioctl_validate(t->net, p);
1309 if (err)
1310 return err;
1311
1312 t = ipip6_tunnel_locate(t->net, p, 0);
1313 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) {
1314 if (!t)
1315 return -ENOENT;
1316 } else {
1317 if (t) {
1318 if (t->dev != dev)
1319 return -EEXIST;
1320 } else {
1321 if (((dev->flags & IFF_POINTOPOINT) && !p->iph.daddr) ||
1322 (!(dev->flags & IFF_POINTOPOINT) && p->iph.daddr))
1323 return -EINVAL;
1324 t = netdev_priv(dev);
1325 }
1326
1327 ipip6_tunnel_update(t, p, t->fwmark);
1328 }
1329
1330 return 0;
1331 }
1332
1333 static int
1334 ipip6_tunnel_del(struct net_device *dev, struct ip_tunnel_parm_kern *p)
1335 {
1336 struct ip_tunnel *t = netdev_priv(dev);
1337
1338 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN))
1339 return -EPERM;
1340
1341 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) {
1342 t = ipip6_tunnel_locate(t->net, p, 0);
1343 if (!t)
1344 return -ENOENT;
1345 if (t == netdev_priv(dev_to_sit_net(dev)->fb_tunnel_dev))
1346 return -EPERM;
1347 dev = t->dev;
1348 }
1349 unregister_netdevice(dev);
1350 return 0;
1351 }
1352
1353 static int
1354 ipip6_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm_kern *p,
1355 int cmd)
1356 {
1357 switch (cmd) {
1358 case SIOCGETTUNNEL:
1359 return ipip6_tunnel_get(dev, p);
1360 case SIOCADDTUNNEL:
1361 return ipip6_tunnel_add(dev, p);
1362 case SIOCCHGTUNNEL:
1363 return ipip6_tunnel_change(dev, p);
1364 case SIOCDELTUNNEL:
1365 return ipip6_tunnel_del(dev, p);
1366 default:
1367 return -EINVAL;
1368 }
1369 }
1370
1371 static int
1372 ipip6_tunnel_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
1373 void __user *data, int cmd)
1374 {
1375 switch (cmd) {
1376 case SIOCGETTUNNEL:
1377 case SIOCADDTUNNEL:
1378 case SIOCCHGTUNNEL:
1379 case SIOCDELTUNNEL:
1380 return ip_tunnel_siocdevprivate(dev, ifr, data, cmd);
1381 case SIOCGETPRL:
1382 return ipip6_tunnel_get_prl(dev, data);
1383 case SIOCADDPRL:
1384 case SIOCDELPRL:
1385 case SIOCCHGPRL:
1386 return ipip6_tunnel_prl_ctl(dev, data, cmd);
1387 #ifdef CONFIG_IPV6_SIT_6RD
1388 case SIOCGET6RD:
1389 return ipip6_tunnel_get6rd(dev, data);
1390 case SIOCADD6RD:
1391 case SIOCCHG6RD:
1392 case SIOCDEL6RD:
1393 return ipip6_tunnel_6rdctl(dev, data, cmd);
1394 #endif
1395 default:
1396 return -EINVAL;
1397 }
1398 }
1399
1400 static const struct net_device_ops ipip6_netdev_ops = {
1401 .ndo_init = ipip6_tunnel_init,
1402 .ndo_uninit = ipip6_tunnel_uninit,
1403 .ndo_start_xmit = sit_tunnel_xmit,
1404 .ndo_siocdevprivate = ipip6_tunnel_siocdevprivate,
1405 .ndo_get_iflink = ip_tunnel_get_iflink,
1406 .ndo_tunnel_ctl = ipip6_tunnel_ctl,
1407 };
1408
1409 static void ipip6_dev_free(struct net_device *dev)
1410 {
1411 struct ip_tunnel *tunnel = netdev_priv(dev);
1412
1413 dst_cache_destroy(&tunnel->dst_cache);
1414 }
1415
1416 #define SIT_FEATURES (NETIF_F_SG | \
1417 NETIF_F_FRAGLIST | \
1418 NETIF_F_HIGHDMA | \
1419 NETIF_F_GSO_SOFTWARE | \
1420 NETIF_F_HW_CSUM)
1421
1422 static void ipip6_tunnel_setup(struct net_device *dev)
1423 {
1424 struct ip_tunnel *tunnel = netdev_priv(dev);
1425 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
1426
1427 dev->netdev_ops = &ipip6_netdev_ops;
1428 dev->header_ops = &ip_tunnel_header_ops;
1429 dev->needs_free_netdev = true;
1430 dev->priv_destructor = ipip6_dev_free;
1431
1432 dev->type = ARPHRD_SIT;
1433 dev->mtu = ETH_DATA_LEN - t_hlen;
1434 dev->min_mtu = IPV6_MIN_MTU;
1435 dev->max_mtu = IP6_MAX_MTU - t_hlen;
1436 dev->flags = IFF_NOARP;
1437 netif_keep_dst(dev);
1438 dev->addr_len = 4;
1439 dev->lltx = true;
1440 dev->features |= SIT_FEATURES;
1441 dev->hw_features |= SIT_FEATURES;
1442 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
1443
1444 }
1445
1446 static int ipip6_tunnel_init(struct net_device *dev)
1447 {
1448 struct ip_tunnel *tunnel = netdev_priv(dev);
1449 int err;
1450
1451 tunnel->dev = dev;
1452 tunnel->net = dev_net(dev);
1453 strcpy(tunnel->parms.name, dev->name);
1454
1455 ipip6_tunnel_bind_dev(dev);
1456
1457 err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1458 if (err)
1459 return err;
1460
1461 netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
1462 netdev_lockdep_set_classes(dev);
1463 return 0;
1464 }
1465
1466 static void __net_init ipip6_fb_tunnel_init(struct net_device *dev)
1467 {
1468 struct ip_tunnel *tunnel = netdev_priv(dev);
1469 struct iphdr *iph = &tunnel->parms.iph;
1470 struct net *net = dev_net(dev);
1471 struct sit_net *sitn = net_generic(net, sit_net_id);
1472
1473 iph->version = 4;
1474 iph->protocol = IPPROTO_IPV6;
1475 iph->ihl = 5;
1476 iph->ttl = 64;
1477
1478 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel);
1479 }
1480
1481 static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[],
1482 struct netlink_ext_ack *extack)
1483 {
1484 u8 proto;
1485
1486 if (!data || !data[IFLA_IPTUN_PROTO])
1487 return 0;
1488
1489 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1490 if (!ipip6_valid_ip_proto(proto))
1491 return -EINVAL;
1492
1493 return 0;
1494 }
1495
1496 static void ipip6_netlink_parms(struct nlattr *data[],
1497 struct ip_tunnel_parm_kern *parms,
1498 __u32 *fwmark)
1499 {
1500 memset(parms, 0, sizeof(*parms));
1501
1502 parms->iph.version = 4;
1503 parms->iph.protocol = IPPROTO_IPV6;
1504 parms->iph.ihl = 5;
1505 parms->iph.ttl = 64;
1506
1507 if (!data)
1508 return;
1509
1510 ip_tunnel_netlink_parms(data, parms);
1511
1512 if (data[IFLA_IPTUN_FWMARK])
1513 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
1514 }
1515
1516 #ifdef CONFIG_IPV6_SIT_6RD
1517 /* This function returns true when 6RD attributes are present in the nl msg */
1518 static bool ipip6_netlink_6rd_parms(struct nlattr *data[],
1519 struct ip_tunnel_6rd *ip6rd)
1520 {
1521 bool ret = false;
1522 memset(ip6rd, 0, sizeof(*ip6rd));
1523
1524 if (!data)
1525 return ret;
1526
1527 if (data[IFLA_IPTUN_6RD_PREFIX]) {
1528 ret = true;
1529 ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]);
1530 }
1531
1532 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) {
1533 ret = true;
1534 ip6rd->relay_prefix =
1535 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]);
1536 }
1537
1538 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) {
1539 ret = true;
1540 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]);
1541 }
1542
1543 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) {
1544 ret = true;
1545 ip6rd->relay_prefixlen =
1546 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
1547 }
1548
1549 return ret;
1550 }
1551 #endif
1552
1553 static int ipip6_newlink(struct net *src_net, struct net_device *dev,
1554 struct nlattr *tb[], struct nlattr *data[],
1555 struct netlink_ext_ack *extack)
1556 {
1557 struct net *net = dev_net(dev);
1558 struct ip_tunnel *nt;
1559 struct ip_tunnel_encap ipencap;
1560 #ifdef CONFIG_IPV6_SIT_6RD
1561 struct ip_tunnel_6rd ip6rd;
1562 #endif
1563 int err;
1564
1565 nt = netdev_priv(dev);
1566
1567 if (ip_tunnel_netlink_encap_parms(data, &ipencap)) {
1568 err = ip_tunnel_encap_setup(nt, &ipencap);
1569 if (err < 0)
1570 return err;
1571 }
1572
1573 ipip6_netlink_parms(data, &nt->parms, &nt->fwmark);
1574
1575 if (ipip6_tunnel_locate(net, &nt->parms, 0))
1576 return -EEXIST;
1577
1578 err = ipip6_tunnel_create(dev);
1579 if (err < 0)
1580 return err;
1581
1582 if (tb[IFLA_MTU]) {
1583 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
1584
1585 if (mtu >= IPV6_MIN_MTU &&
1586 mtu <= IP6_MAX_MTU - dev->hard_header_len)
1587 dev->mtu = mtu;
1588 }
1589
1590 #ifdef CONFIG_IPV6_SIT_6RD
1591 if (ipip6_netlink_6rd_parms(data, &ip6rd)) {
1592 err = ipip6_tunnel_update_6rd(nt, &ip6rd);
1593 if (err < 0)
1594 unregister_netdevice_queue(dev, NULL);
1595 }
1596 #endif
1597
1598 return err;
1599 }
1600
1601 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[],
1602 struct nlattr *data[],
1603 struct netlink_ext_ack *extack)
1604 {
1605 struct ip_tunnel *t = netdev_priv(dev);
1606 struct ip_tunnel_encap ipencap;
1607 struct ip_tunnel_parm_kern p;
1608 struct net *net = t->net;
1609 struct sit_net *sitn = net_generic(net, sit_net_id);
1610 #ifdef CONFIG_IPV6_SIT_6RD
1611 struct ip_tunnel_6rd ip6rd;
1612 #endif
1613 __u32 fwmark = t->fwmark;
1614 int err;
1615
1616 if (dev == sitn->fb_tunnel_dev)
1617 return -EINVAL;
1618
1619 if (ip_tunnel_netlink_encap_parms(data, &ipencap)) {
1620 err = ip_tunnel_encap_setup(t, &ipencap);
1621 if (err < 0)
1622 return err;
1623 }
1624
1625 ipip6_netlink_parms(data, &p, &fwmark);
1626
1627 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
1628 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
1629 return -EINVAL;
1630
1631 t = ipip6_tunnel_locate(net, &p, 0);
1632
1633 if (t) {
1634 if (t->dev != dev)
1635 return -EEXIST;
1636 } else
1637 t = netdev_priv(dev);
1638
1639 ipip6_tunnel_update(t, &p, fwmark);
1640
1641 #ifdef CONFIG_IPV6_SIT_6RD
1642 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1643 return ipip6_tunnel_update_6rd(t, &ip6rd);
1644 #endif
1645
1646 return 0;
1647 }
1648
1649 static size_t ipip6_get_size(const struct net_device *dev)
1650 {
1651 return
1652 /* IFLA_IPTUN_LINK */
1653 nla_total_size(4) +
1654 /* IFLA_IPTUN_LOCAL */
1655 nla_total_size(4) +
1656 /* IFLA_IPTUN_REMOTE */
1657 nla_total_size(4) +
1658 /* IFLA_IPTUN_TTL */
1659 nla_total_size(1) +
1660 /* IFLA_IPTUN_TOS */
1661 nla_total_size(1) +
1662 /* IFLA_IPTUN_PMTUDISC */
1663 nla_total_size(1) +
1664 /* IFLA_IPTUN_FLAGS */
1665 nla_total_size(2) +
1666 /* IFLA_IPTUN_PROTO */
1667 nla_total_size(1) +
1668 #ifdef CONFIG_IPV6_SIT_6RD
1669 /* IFLA_IPTUN_6RD_PREFIX */
1670 nla_total_size(sizeof(struct in6_addr)) +
1671 /* IFLA_IPTUN_6RD_RELAY_PREFIX */
1672 nla_total_size(4) +
1673 /* IFLA_IPTUN_6RD_PREFIXLEN */
1674 nla_total_size(2) +
1675 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */
1676 nla_total_size(2) +
1677 #endif
1678 /* IFLA_IPTUN_ENCAP_TYPE */
1679 nla_total_size(2) +
1680 /* IFLA_IPTUN_ENCAP_FLAGS */
1681 nla_total_size(2) +
1682 /* IFLA_IPTUN_ENCAP_SPORT */
1683 nla_total_size(2) +
1684 /* IFLA_IPTUN_ENCAP_DPORT */
1685 nla_total_size(2) +
1686 /* IFLA_IPTUN_FWMARK */
1687 nla_total_size(4) +
1688 0;
1689 }
1690
1691 static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1692 {
1693 struct ip_tunnel *tunnel = netdev_priv(dev);
1694 struct ip_tunnel_parm_kern *parm = &tunnel->parms;
1695
1696 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
1697 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
1698 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
1699 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
1700 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
1701 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
1702 !!(parm->iph.frag_off & htons(IP_DF))) ||
1703 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
1704 nla_put_be16(skb, IFLA_IPTUN_FLAGS,
1705 ip_tunnel_flags_to_be16(parm->i_flags)) ||
1706 nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark))
1707 goto nla_put_failure;
1708
1709 #ifdef CONFIG_IPV6_SIT_6RD
1710 if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX,
1711 &tunnel->ip6rd.prefix) ||
1712 nla_put_in_addr(skb, IFLA_IPTUN_6RD_RELAY_PREFIX,
1713 tunnel->ip6rd.relay_prefix) ||
1714 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN,
1715 tunnel->ip6rd.prefixlen) ||
1716 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
1717 tunnel->ip6rd.relay_prefixlen))
1718 goto nla_put_failure;
1719 #endif
1720
1721 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE,
1722 tunnel->encap.type) ||
1723 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT,
1724 tunnel->encap.sport) ||
1725 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT,
1726 tunnel->encap.dport) ||
1727 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS,
1728 tunnel->encap.flags))
1729 goto nla_put_failure;
1730
1731 return 0;
1732
1733 nla_put_failure:
1734 return -EMSGSIZE;
1735 }
1736
1737 static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = {
1738 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1739 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 },
1740 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 },
1741 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1742 [IFLA_IPTUN_TOS] = { .type = NLA_U8 },
1743 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 },
1744 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 },
1745 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
1746 #ifdef CONFIG_IPV6_SIT_6RD
1747 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) },
1748 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 },
1749 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 },
1750 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 },
1751 #endif
1752 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
1753 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
1754 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
1755 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
1756 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
1757 };
1758
1759 static void ipip6_dellink(struct net_device *dev, struct list_head *head)
1760 {
1761 struct net *net = dev_net(dev);
1762 struct sit_net *sitn = net_generic(net, sit_net_id);
1763
1764 if (dev != sitn->fb_tunnel_dev)
1765 unregister_netdevice_queue(dev, head);
1766 }
1767
1768 static struct rtnl_link_ops sit_link_ops __read_mostly = {
1769 .kind = "sit",
1770 .maxtype = IFLA_IPTUN_MAX,
1771 .policy = ipip6_policy,
1772 .priv_size = sizeof(struct ip_tunnel),
1773 .setup = ipip6_tunnel_setup,
1774 .validate = ipip6_validate,
1775 .newlink = ipip6_newlink,
1776 .changelink = ipip6_changelink,
1777 .get_size = ipip6_get_size,
1778 .fill_info = ipip6_fill_info,
1779 .dellink = ipip6_dellink,
1780 .get_link_net = ip_tunnel_get_link_net,
1781 };
1782
1783 static struct xfrm_tunnel sit_handler __read_mostly = {
1784 .handler = ipip6_rcv,
1785 .err_handler = ipip6_err,
1786 .priority = 1,
1787 };
1788
1789 static struct xfrm_tunnel ipip_handler __read_mostly = {
1790 .handler = ipip_rcv,
1791 .err_handler = ipip6_err,
1792 .priority = 2,
1793 };
1794
1795 #if IS_ENABLED(CONFIG_MPLS)
1796 static struct xfrm_tunnel mplsip_handler __read_mostly = {
1797 .handler = mplsip_rcv,
1798 .err_handler = ipip6_err,
1799 .priority = 2,
1800 };
1801 #endif
1802
1803 static void __net_exit sit_destroy_tunnels(struct net *net,
1804 struct list_head *head)
1805 {
1806 struct sit_net *sitn = net_generic(net, sit_net_id);
1807 struct net_device *dev, *aux;
1808 int prio;
1809
1810 for_each_netdev_safe(net, dev, aux)
1811 if (dev->rtnl_link_ops == &sit_link_ops)
1812 unregister_netdevice_queue(dev, head);
1813
1814 for (prio = 0; prio < 4; prio++) {
1815 int h;
1816 for (h = 0; h < (prio ? IP6_SIT_HASH_SIZE : 1); h++) {
1817 struct ip_tunnel *t;
1818
1819 t = rtnl_dereference(sitn->tunnels[prio][h]);
1820 while (t) {
1821 /* If dev is in the same netns, it has already
1822 * been added to the list by the previous loop.
1823 */
1824 if (!net_eq(dev_net(t->dev), net))
1825 unregister_netdevice_queue(t->dev,
1826 head);
1827 t = rtnl_dereference(t->next);
1828 }
1829 }
1830 }
1831 }
1832
1833 static int __net_init sit_init_net(struct net *net)
1834 {
1835 struct sit_net *sitn = net_generic(net, sit_net_id);
1836 struct ip_tunnel *t;
1837 int err;
1838
1839 sitn->tunnels[0] = sitn->tunnels_wc;
1840 sitn->tunnels[1] = sitn->tunnels_l;
1841 sitn->tunnels[2] = sitn->tunnels_r;
1842 sitn->tunnels[3] = sitn->tunnels_r_l;
1843
1844 if (!net_has_fallback_tunnels(net))
1845 return 0;
1846
1847 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
1848 NET_NAME_UNKNOWN,
1849 ipip6_tunnel_setup);
1850 if (!sitn->fb_tunnel_dev) {
1851 err = -ENOMEM;
1852 goto err_alloc_dev;
1853 }
1854 dev_net_set(sitn->fb_tunnel_dev, net);
1855 sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops;
1856 /* FB netdevice is special: we have one, and only one per netns.
1857 * Allowing to move it to another netns is clearly unsafe.
1858 */
1859 sitn->fb_tunnel_dev->netns_local = true;
1860
1861 err = register_netdev(sitn->fb_tunnel_dev);
1862 if (err)
1863 goto err_reg_dev;
1864
1865 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
1866 ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
1867
1868 t = netdev_priv(sitn->fb_tunnel_dev);
1869
1870 strcpy(t->parms.name, sitn->fb_tunnel_dev->name);
1871 return 0;
1872
1873 err_reg_dev:
1874 free_netdev(sitn->fb_tunnel_dev);
1875 err_alloc_dev:
1876 return err;
1877 }
1878
1879 static void __net_exit sit_exit_batch_rtnl(struct list_head *net_list,
1880 struct list_head *dev_to_kill)
1881 {
1882 struct net *net;
1883
1884 ASSERT_RTNL();
1885 list_for_each_entry(net, net_list, exit_list)
1886 sit_destroy_tunnels(net, dev_to_kill);
1887 }
1888
1889 static struct pernet_operations sit_net_ops = {
1890 .init = sit_init_net,
1891 .exit_batch_rtnl = sit_exit_batch_rtnl,
1892 .id = &sit_net_id,
1893 .size = sizeof(struct sit_net),
1894 };
1895
1896 static void __exit sit_cleanup(void)
1897 {
1898 rtnl_link_unregister(&sit_link_ops);
1899 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1900 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
1901 #if IS_ENABLED(CONFIG_MPLS)
1902 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS);
1903 #endif
1904
1905 unregister_pernet_device(&sit_net_ops);
1906 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1907 }
1908
1909 static int __init sit_init(void)
1910 {
1911 int err;
1912
1913 pr_info("IPv6, IPv4 and MPLS over IPv4 tunneling driver\n");
1914
1915 err = register_pernet_device(&sit_net_ops);
1916 if (err < 0)
1917 return err;
1918 err = xfrm4_tunnel_register(&sit_handler, AF_INET6);
1919 if (err < 0) {
1920 pr_info("%s: can't register ip6ip4\n", __func__);
1921 goto xfrm_tunnel_failed;
1922 }
1923 err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
1924 if (err < 0) {
1925 pr_info("%s: can't register ip4ip4\n", __func__);
1926 goto xfrm_tunnel4_failed;
1927 }
1928 #if IS_ENABLED(CONFIG_MPLS)
1929 err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS);
1930 if (err < 0) {
1931 pr_info("%s: can't register mplsip\n", __func__);
1932 goto xfrm_tunnel_mpls_failed;
1933 }
1934 #endif
1935 err = rtnl_link_register(&sit_link_ops);
1936 if (err < 0)
1937 goto rtnl_link_failed;
1938
1939 out:
1940 return err;
1941
1942 rtnl_link_failed:
1943 #if IS_ENABLED(CONFIG_MPLS)
1944 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS);
1945 xfrm_tunnel_mpls_failed:
1946 #endif
1947 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
1948 xfrm_tunnel4_failed:
1949 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1950 xfrm_tunnel_failed:
1951 unregister_pernet_device(&sit_net_ops);
1952 goto out;
1953 }
1954
1955 module_init(sit_init);
1956 module_exit(sit_cleanup);
1957 MODULE_DESCRIPTION("IPv6-in-IPv4 tunnel SIT driver");
1958 MODULE_LICENSE("GPL");
1959 MODULE_ALIAS_RTNL_LINK("sit");
1960 MODULE_ALIAS_NETDEV("sit0");
Linux Kernel