?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Linux 4.19.133
[linux/fpc-iii.git] / net / ipv6 / sit.c
blobbfed7508ba19a470d265050d23879d257d776fd8
1 /*
2 * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT)
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 *
14 * Changes:
15 * Roger Venning <r.venning@telstra.com>: 6to4 support
16 * Nate Thompson <nate@thebog.net>: 6to4 support
17 * Fred Templin <fred.l.templin@boeing.com>: isatap support
18 */
19
20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
21
22 #include <linux/module.h>
23 #include <linux/capability.h>
24 #include <linux/errno.h>
25 #include <linux/types.h>
26 #include <linux/socket.h>
27 #include <linux/sockios.h>
28 #include <linux/net.h>
29 #include <linux/in6.h>
30 #include <linux/netdevice.h>
31 #include <linux/if_arp.h>
32 #include <linux/icmp.h>
33 #include <linux/slab.h>
34 #include <linux/uaccess.h>
35 #include <linux/init.h>
36 #include <linux/netfilter_ipv4.h>
37 #include <linux/if_ether.h>
38
39 #include <net/sock.h>
40 #include <net/snmp.h>
41
42 #include <net/ipv6.h>
43 #include <net/protocol.h>
44 #include <net/transp_v6.h>
45 #include <net/ip6_fib.h>
46 #include <net/ip6_route.h>
47 #include <net/ndisc.h>
48 #include <net/addrconf.h>
49 #include <net/ip.h>
50 #include <net/udp.h>
51 #include <net/icmp.h>
52 #include <net/ip_tunnels.h>
53 #include <net/inet_ecn.h>
54 #include <net/xfrm.h>
55 #include <net/dsfield.h>
56 #include <net/net_namespace.h>
57 #include <net/netns/generic.h>
58
59 /*
60 This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c
61
62 For comments look at net/ipv4/ip_gre.c --ANK
63 */
64
65 #define IP6_SIT_HASH_SIZE 16
66 #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
67
68 static bool log_ecn_error = true;
69 module_param(log_ecn_error, bool, 0644);
70 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
71
72 static int ipip6_tunnel_init(struct net_device *dev);
73 static void ipip6_tunnel_setup(struct net_device *dev);
74 static void ipip6_dev_free(struct net_device *dev);
75 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
76 __be32 *v4dst);
77 static struct rtnl_link_ops sit_link_ops __read_mostly;
78
79 static unsigned int sit_net_id __read_mostly;
80 struct sit_net {
81 struct ip_tunnel __rcu *tunnels_r_l[IP6_SIT_HASH_SIZE];
82 struct ip_tunnel __rcu *tunnels_r[IP6_SIT_HASH_SIZE];
83 struct ip_tunnel __rcu *tunnels_l[IP6_SIT_HASH_SIZE];
84 struct ip_tunnel __rcu *tunnels_wc[1];
85 struct ip_tunnel __rcu **tunnels[4];
86
87 struct net_device *fb_tunnel_dev;
88 };
89
90 /*
91 * Must be invoked with rcu_read_lock
92 */
93 static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net,
94 struct net_device *dev,
95 __be32 remote, __be32 local,
96 int sifindex)
97 {
98 unsigned int h0 = HASH(remote);
99 unsigned int h1 = HASH(local);
100 struct ip_tunnel *t;
101 struct sit_net *sitn = net_generic(net, sit_net_id);
102 int ifindex = dev ? dev->ifindex : 0;
103
104 for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) {
105 if (local == t->parms.iph.saddr &&
106 remote == t->parms.iph.daddr &&
107 (!dev || !t->parms.link || ifindex == t->parms.link ||
108 sifindex == t->parms.link) &&
109 (t->dev->flags & IFF_UP))
110 return t;
111 }
112 for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) {
113 if (remote == t->parms.iph.daddr &&
114 (!dev || !t->parms.link || ifindex == t->parms.link ||
115 sifindex == t->parms.link) &&
116 (t->dev->flags & IFF_UP))
117 return t;
118 }
119 for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) {
120 if (local == t->parms.iph.saddr &&
121 (!dev || !t->parms.link || ifindex == t->parms.link ||
122 sifindex == t->parms.link) &&
123 (t->dev->flags & IFF_UP))
124 return t;
125 }
126 t = rcu_dereference(sitn->tunnels_wc[0]);
127 if (t && (t->dev->flags & IFF_UP))
128 return t;
129 return NULL;
130 }
131
132 static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn,
133 struct ip_tunnel_parm *parms)
134 {
135 __be32 remote = parms->iph.daddr;
136 __be32 local = parms->iph.saddr;
137 unsigned int h = 0;
138 int prio = 0;
139
140 if (remote) {
141 prio |= 2;
142 h ^= HASH(remote);
143 }
144 if (local) {
145 prio |= 1;
146 h ^= HASH(local);
147 }
148 return &sitn->tunnels[prio][h];
149 }
150
151 static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn,
152 struct ip_tunnel *t)
153 {
154 return __ipip6_bucket(sitn, &t->parms);
155 }
156
157 static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t)
158 {
159 struct ip_tunnel __rcu **tp;
160 struct ip_tunnel *iter;
161
162 for (tp = ipip6_bucket(sitn, t);
163 (iter = rtnl_dereference(*tp)) != NULL;
164 tp = &iter->next) {
165 if (t == iter) {
166 rcu_assign_pointer(*tp, t->next);
167 break;
168 }
169 }
170 }
171
172 static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t)
173 {
174 struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t);
175
176 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
177 rcu_assign_pointer(*tp, t);
178 }
179
180 static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn)
181 {
182 #ifdef CONFIG_IPV6_SIT_6RD
183 struct ip_tunnel *t = netdev_priv(dev);
184
185 if (dev == sitn->fb_tunnel_dev || !sitn->fb_tunnel_dev) {
186 ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0);
187 t->ip6rd.relay_prefix = 0;
188 t->ip6rd.prefixlen = 16;
189 t->ip6rd.relay_prefixlen = 0;
190 } else {
191 struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev);
192 memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd));
193 }
194 #endif
195 }
196
197 static int ipip6_tunnel_create(struct net_device *dev)
198 {
199 struct ip_tunnel *t = netdev_priv(dev);
200 struct net *net = dev_net(dev);
201 struct sit_net *sitn = net_generic(net, sit_net_id);
202 int err;
203
204 memcpy(dev->dev_addr, &t->parms.iph.saddr, 4);
205 memcpy(dev->broadcast, &t->parms.iph.daddr, 4);
206
207 if ((__force u16)t->parms.i_flags & SIT_ISATAP)
208 dev->priv_flags |= IFF_ISATAP;
209
210 dev->rtnl_link_ops = &sit_link_ops;
211
212 err = register_netdevice(dev);
213 if (err < 0)
214 goto out;
215
216 ipip6_tunnel_clone_6rd(dev, sitn);
217
218 dev_hold(dev);
219
220 ipip6_tunnel_link(sitn, t);
221 return 0;
222
223 out:
224 return err;
225 }
226
227 static struct ip_tunnel *ipip6_tunnel_locate(struct net *net,
228 struct ip_tunnel_parm *parms, int create)
229 {
230 __be32 remote = parms->iph.daddr;
231 __be32 local = parms->iph.saddr;
232 struct ip_tunnel *t, *nt;
233 struct ip_tunnel __rcu **tp;
234 struct net_device *dev;
235 char name[IFNAMSIZ];
236 struct sit_net *sitn = net_generic(net, sit_net_id);
237
238 for (tp = __ipip6_bucket(sitn, parms);
239 (t = rtnl_dereference(*tp)) != NULL;
240 tp = &t->next) {
241 if (local == t->parms.iph.saddr &&
242 remote == t->parms.iph.daddr &&
243 parms->link == t->parms.link) {
244 if (create)
245 return NULL;
246 else
247 return t;
248 }
249 }
250 if (!create)
251 goto failed;
252
253 if (parms->name[0]) {
254 if (!dev_valid_name(parms->name))
255 goto failed;
256 strlcpy(name, parms->name, IFNAMSIZ);
257 } else {
258 strcpy(name, "sit%d");
259 }
260 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
261 ipip6_tunnel_setup);
262 if (!dev)
263 return NULL;
264
265 dev_net_set(dev, net);
266
267 nt = netdev_priv(dev);
268
269 nt->parms = *parms;
270 if (ipip6_tunnel_create(dev) < 0)
271 goto failed_free;
272
273 return nt;
274
275 failed_free:
276 free_netdev(dev);
277 failed:
278 return NULL;
279 }
280
281 #define for_each_prl_rcu(start) \
282 for (prl = rcu_dereference(start); \
283 prl; \
284 prl = rcu_dereference(prl->next))
285
286 static struct ip_tunnel_prl_entry *
287 __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
288 {
289 struct ip_tunnel_prl_entry *prl;
290
291 for_each_prl_rcu(t->prl)
292 if (prl->addr == addr)
293 break;
294 return prl;
295
296 }
297
298 static int ipip6_tunnel_get_prl(struct ip_tunnel *t,
299 struct ip_tunnel_prl __user *a)
300 {
301 struct ip_tunnel_prl kprl, *kp;
302 struct ip_tunnel_prl_entry *prl;
303 unsigned int cmax, c = 0, ca, len;
304 int ret = 0;
305
306 if (copy_from_user(&kprl, a, sizeof(kprl)))
307 return -EFAULT;
308 cmax = kprl.datalen / sizeof(kprl);
309 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY))
310 cmax = 1;
311
312 /* For simple GET or for root users,
313 * we try harder to allocate.
314 */
315 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
316 kcalloc(cmax, sizeof(*kp), GFP_KERNEL | __GFP_NOWARN) :
317 NULL;
318
319 rcu_read_lock();
320
321 ca = t->prl_count < cmax ? t->prl_count : cmax;
322
323 if (!kp) {
324 /* We don't try hard to allocate much memory for
325 * non-root users.
326 * For root users, retry allocating enough memory for
327 * the answer.
328 */
329 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC);
330 if (!kp) {
331 ret = -ENOMEM;
332 goto out;
333 }
334 }
335
336 c = 0;
337 for_each_prl_rcu(t->prl) {
338 if (c >= cmax)
339 break;
340 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr)
341 continue;
342 kp[c].addr = prl->addr;
343 kp[c].flags = prl->flags;
344 c++;
345 if (kprl.addr != htonl(INADDR_ANY))
346 break;
347 }
348 out:
349 rcu_read_unlock();
350
351 len = sizeof(*kp) * c;
352 ret = 0;
353 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen))
354 ret = -EFAULT;
355
356 kfree(kp);
357
358 return ret;
359 }
360
361 static int
362 ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
363 {
364 struct ip_tunnel_prl_entry *p;
365 int err = 0;
366
367 if (a->addr == htonl(INADDR_ANY))
368 return -EINVAL;
369
370 ASSERT_RTNL();
371
372 for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) {
373 if (p->addr == a->addr) {
374 if (chg) {
375 p->flags = a->flags;
376 goto out;
377 }
378 err = -EEXIST;
379 goto out;
380 }
381 }
382
383 if (chg) {
384 err = -ENXIO;
385 goto out;
386 }
387
388 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
389 if (!p) {
390 err = -ENOBUFS;
391 goto out;
392 }
393
394 p->next = t->prl;
395 p->addr = a->addr;
396 p->flags = a->flags;
397 t->prl_count++;
398 rcu_assign_pointer(t->prl, p);
399 out:
400 return err;
401 }
402
403 static void prl_list_destroy_rcu(struct rcu_head *head)
404 {
405 struct ip_tunnel_prl_entry *p, *n;
406
407 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head);
408 do {
409 n = rcu_dereference_protected(p->next, 1);
410 kfree(p);
411 p = n;
412 } while (p);
413 }
414
415 static int
416 ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
417 {
418 struct ip_tunnel_prl_entry *x;
419 struct ip_tunnel_prl_entry __rcu **p;
420 int err = 0;
421
422 ASSERT_RTNL();
423
424 if (a && a->addr != htonl(INADDR_ANY)) {
425 for (p = &t->prl;
426 (x = rtnl_dereference(*p)) != NULL;
427 p = &x->next) {
428 if (x->addr == a->addr) {
429 *p = x->next;
430 kfree_rcu(x, rcu_head);
431 t->prl_count--;
432 goto out;
433 }
434 }
435 err = -ENXIO;
436 } else {
437 x = rtnl_dereference(t->prl);
438 if (x) {
439 t->prl_count = 0;
440 call_rcu(&x->rcu_head, prl_list_destroy_rcu);
441 t->prl = NULL;
442 }
443 }
444 out:
445 return err;
446 }
447
448 static int
449 isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t)
450 {
451 struct ip_tunnel_prl_entry *p;
452 int ok = 1;
453
454 rcu_read_lock();
455 p = __ipip6_tunnel_locate_prl(t, iph->saddr);
456 if (p) {
457 if (p->flags & PRL_DEFAULT)
458 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
459 else
460 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
461 } else {
462 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
463
464 if (ipv6_addr_is_isatap(addr6) &&
465 (addr6->s6_addr32[3] == iph->saddr) &&
466 ipv6_chk_prefix(addr6, t->dev))
467 skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
468 else
469 ok = 0;
470 }
471 rcu_read_unlock();
472 return ok;
473 }
474
475 static void ipip6_tunnel_uninit(struct net_device *dev)
476 {
477 struct ip_tunnel *tunnel = netdev_priv(dev);
478 struct sit_net *sitn = net_generic(tunnel->net, sit_net_id);
479
480 if (dev == sitn->fb_tunnel_dev) {
481 RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL);
482 } else {
483 ipip6_tunnel_unlink(sitn, tunnel);
484 ipip6_tunnel_del_prl(tunnel, NULL);
485 }
486 dst_cache_reset(&tunnel->dst_cache);
487 dev_put(dev);
488 }
489
490 static int ipip6_err(struct sk_buff *skb, u32 info)
491 {
492 const struct iphdr *iph = (const struct iphdr *)skb->data;
493 const int type = icmp_hdr(skb)->type;
494 const int code = icmp_hdr(skb)->code;
495 unsigned int data_len = 0;
496 struct ip_tunnel *t;
497 int sifindex;
498 int err;
499
500 switch (type) {
501 default:
502 case ICMP_PARAMETERPROB:
503 return 0;
504
505 case ICMP_DEST_UNREACH:
506 switch (code) {
507 case ICMP_SR_FAILED:
508 /* Impossible event. */
509 return 0;
510 default:
511 /* All others are translated to HOST_UNREACH.
512 rfc2003 contains "deep thoughts" about NET_UNREACH,
513 I believe they are just ether pollution. --ANK
514 */
515 break;
516 }
517 break;
518 case ICMP_TIME_EXCEEDED:
519 if (code != ICMP_EXC_TTL)
520 return 0;
521 data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */
522 break;
523 case ICMP_REDIRECT:
524 break;
525 }
526
527 err = -ENOENT;
528
529 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0;
530 t = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
531 iph->daddr, iph->saddr, sifindex);
532 if (!t)
533 goto out;
534
535 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
536 ipv4_update_pmtu(skb, dev_net(skb->dev), info,
537 t->parms.link, 0, iph->protocol, 0);
538 err = 0;
539 goto out;
540 }
541 if (type == ICMP_REDIRECT) {
542 ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 0,
543 iph->protocol, 0);
544 err = 0;
545 goto out;
546 }
547
548 err = 0;
549 if (__in6_dev_get(skb->dev) &&
550 !ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4, type, data_len))
551 goto out;
552
553 if (t->parms.iph.daddr == 0)
554 goto out;
555
556 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
557 goto out;
558
559 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
560 t->err_count++;
561 else
562 t->err_count = 1;
563 t->err_time = jiffies;
564 out:
565 return err;
566 }
567
568 static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr,
569 const struct in6_addr *v6addr)
570 {
571 __be32 v4embed = 0;
572 if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed)
573 return true;
574 return false;
575 }
576
577 /* Checks if an address matches an address on the tunnel interface.
578 * Used to detect the NAT of proto 41 packets and let them pass spoofing test.
579 * Long story:
580 * This function is called after we considered the packet as spoofed
581 * in is_spoofed_6rd.
582 * We may have a router that is doing NAT for proto 41 packets
583 * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb
584 * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd
585 * function will return true, dropping the packet.
586 * But, we can still check if is spoofed against the IP
587 * addresses associated with the interface.
588 */
589 static bool only_dnatted(const struct ip_tunnel *tunnel,
590 const struct in6_addr *v6dst)
591 {
592 int prefix_len;
593
594 #ifdef CONFIG_IPV6_SIT_6RD
595 prefix_len = tunnel->ip6rd.prefixlen + 32
596 - tunnel->ip6rd.relay_prefixlen;
597 #else
598 prefix_len = 48;
599 #endif
600 return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev);
601 }
602
603 /* Returns true if a packet is spoofed */
604 static bool packet_is_spoofed(struct sk_buff *skb,
605 const struct iphdr *iph,
606 struct ip_tunnel *tunnel)
607 {
608 const struct ipv6hdr *ipv6h;
609
610 if (tunnel->dev->priv_flags & IFF_ISATAP) {
611 if (!isatap_chksrc(skb, iph, tunnel))
612 return true;
613
614 return false;
615 }
616
617 if (tunnel->dev->flags & IFF_POINTOPOINT)
618 return false;
619
620 ipv6h = ipv6_hdr(skb);
621
622 if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) {
623 net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
624 &iph->saddr, &ipv6h->saddr,
625 &iph->daddr, &ipv6h->daddr);
626 return true;
627 }
628
629 if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr)))
630 return false;
631
632 if (only_dnatted(tunnel, &ipv6h->daddr))
633 return false;
634
635 net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
636 &iph->saddr, &ipv6h->saddr,
637 &iph->daddr, &ipv6h->daddr);
638 return true;
639 }
640
641 static int ipip6_rcv(struct sk_buff *skb)
642 {
643 const struct iphdr *iph = ip_hdr(skb);
644 struct ip_tunnel *tunnel;
645 int sifindex;
646 int err;
647
648 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0;
649 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
650 iph->saddr, iph->daddr, sifindex);
651 if (tunnel) {
652 struct pcpu_sw_netstats *tstats;
653
654 if (tunnel->parms.iph.protocol != IPPROTO_IPV6 &&
655 tunnel->parms.iph.protocol != 0)
656 goto out;
657
658 skb->mac_header = skb->network_header;
659 skb_reset_network_header(skb);
660 IPCB(skb)->flags = 0;
661 skb->dev = tunnel->dev;
662
663 if (packet_is_spoofed(skb, iph, tunnel)) {
664 tunnel->dev->stats.rx_errors++;
665 goto out;
666 }
667
668 if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6),
669 !net_eq(tunnel->net, dev_net(tunnel->dev))))
670 goto out;
671
672 /* skb can be uncloned in iptunnel_pull_header, so
673 * old iph is no longer valid
674 */
675 iph = (const struct iphdr *)skb_mac_header(skb);
676 err = IP_ECN_decapsulate(iph, skb);
677 if (unlikely(err)) {
678 if (log_ecn_error)
679 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
680 &iph->saddr, iph->tos);
681 if (err > 1) {
682 ++tunnel->dev->stats.rx_frame_errors;
683 ++tunnel->dev->stats.rx_errors;
684 goto out;
685 }
686 }
687
688 tstats = this_cpu_ptr(tunnel->dev->tstats);
689 u64_stats_update_begin(&tstats->syncp);
690 tstats->rx_packets++;
691 tstats->rx_bytes += skb->len;
692 u64_stats_update_end(&tstats->syncp);
693
694 netif_rx(skb);
695
696 return 0;
697 }
698
699 /* no tunnel matched, let upstream know, ipsec may handle it */
700 return 1;
701 out:
702 kfree_skb(skb);
703 return 0;
704 }
705
706 static const struct tnl_ptk_info ipip_tpi = {
707 /* no tunnel info required for ipip. */
708 .proto = htons(ETH_P_IP),
709 };
710
711 #if IS_ENABLED(CONFIG_MPLS)
712 static const struct tnl_ptk_info mplsip_tpi = {
713 /* no tunnel info required for mplsip. */
714 .proto = htons(ETH_P_MPLS_UC),
715 };
716 #endif
717
718 static int sit_tunnel_rcv(struct sk_buff *skb, u8 ipproto)
719 {
720 const struct iphdr *iph;
721 struct ip_tunnel *tunnel;
722 int sifindex;
723
724 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0;
725
726 iph = ip_hdr(skb);
727 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
728 iph->saddr, iph->daddr, sifindex);
729 if (tunnel) {
730 const struct tnl_ptk_info *tpi;
731
732 if (tunnel->parms.iph.protocol != ipproto &&
733 tunnel->parms.iph.protocol != 0)
734 goto drop;
735
736 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
737 goto drop;
738 #if IS_ENABLED(CONFIG_MPLS)
739 if (ipproto == IPPROTO_MPLS)
740 tpi = &mplsip_tpi;
741 else
742 #endif
743 tpi = &ipip_tpi;
744 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
745 goto drop;
746 return ip_tunnel_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
747 }
748
749 return 1;
750
751 drop:
752 kfree_skb(skb);
753 return 0;
754 }
755
756 static int ipip_rcv(struct sk_buff *skb)
757 {
758 return sit_tunnel_rcv(skb, IPPROTO_IPIP);
759 }
760
761 #if IS_ENABLED(CONFIG_MPLS)
762 static int mplsip_rcv(struct sk_buff *skb)
763 {
764 return sit_tunnel_rcv(skb, IPPROTO_MPLS);
765 }
766 #endif
767
768 /*
769 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function
770 * stores the embedded IPv4 address in v4dst and returns true.
771 */
772 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
773 __be32 *v4dst)
774 {
775 #ifdef CONFIG_IPV6_SIT_6RD
776 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix,
777 tunnel->ip6rd.prefixlen)) {
778 unsigned int pbw0, pbi0;
779 int pbi1;
780 u32 d;
781
782 pbw0 = tunnel->ip6rd.prefixlen >> 5;
783 pbi0 = tunnel->ip6rd.prefixlen & 0x1f;
784
785 d = tunnel->ip6rd.relay_prefixlen < 32 ?
786 (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
787 tunnel->ip6rd.relay_prefixlen : 0;
788
789 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;
790 if (pbi1 > 0)
791 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >>
792 (32 - pbi1);
793
794 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d);
795 return true;
796 }
797 #else
798 if (v6dst->s6_addr16[0] == htons(0x2002)) {
799 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
800 memcpy(v4dst, &v6dst->s6_addr16[1], 4);
801 return true;
802 }
803 #endif
804 return false;
805 }
806
807 static inline __be32 try_6rd(struct ip_tunnel *tunnel,
808 const struct in6_addr *v6dst)
809 {
810 __be32 dst = 0;
811 check_6rd(tunnel, v6dst, &dst);
812 return dst;
813 }
814
815 /*
816 * This function assumes it is being called from dev_queue_xmit()
817 * and that skb is filled properly by that function.
818 */
819
820 static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
821 struct net_device *dev)
822 {
823 struct ip_tunnel *tunnel = netdev_priv(dev);
824 const struct iphdr *tiph = &tunnel->parms.iph;
825 const struct ipv6hdr *iph6 = ipv6_hdr(skb);
826 u8 tos = tunnel->parms.iph.tos;
827 __be16 df = tiph->frag_off;
828 struct rtable *rt; /* Route to the other host */
829 struct net_device *tdev; /* Device to other host */
830 unsigned int max_headroom; /* The extra header space needed */
831 __be32 dst = tiph->daddr;
832 struct flowi4 fl4;
833 int mtu;
834 const struct in6_addr *addr6;
835 int addr_type;
836 u8 ttl;
837 u8 protocol = IPPROTO_IPV6;
838 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
839
840 if (tos == 1)
841 tos = ipv6_get_dsfield(iph6);
842
843 /* ISATAP (RFC4214) - must come before 6to4 */
844 if (dev->priv_flags & IFF_ISATAP) {
845 struct neighbour *neigh = NULL;
846 bool do_tx_error = false;
847
848 if (skb_dst(skb))
849 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
850
851 if (!neigh) {
852 net_dbg_ratelimited("nexthop == NULL\n");
853 goto tx_error;
854 }
855
856 addr6 = (const struct in6_addr *)&neigh->primary_key;
857 addr_type = ipv6_addr_type(addr6);
858
859 if ((addr_type & IPV6_ADDR_UNICAST) &&
860 ipv6_addr_is_isatap(addr6))
861 dst = addr6->s6_addr32[3];
862 else
863 do_tx_error = true;
864
865 neigh_release(neigh);
866 if (do_tx_error)
867 goto tx_error;
868 }
869
870 if (!dst)
871 dst = try_6rd(tunnel, &iph6->daddr);
872
873 if (!dst) {
874 struct neighbour *neigh = NULL;
875 bool do_tx_error = false;
876
877 if (skb_dst(skb))
878 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
879
880 if (!neigh) {
881 net_dbg_ratelimited("nexthop == NULL\n");
882 goto tx_error;
883 }
884
885 addr6 = (const struct in6_addr *)&neigh->primary_key;
886 addr_type = ipv6_addr_type(addr6);
887
888 if (addr_type == IPV6_ADDR_ANY) {
889 addr6 = &ipv6_hdr(skb)->daddr;
890 addr_type = ipv6_addr_type(addr6);
891 }
892
893 if ((addr_type & IPV6_ADDR_COMPATv4) != 0)
894 dst = addr6->s6_addr32[3];
895 else
896 do_tx_error = true;
897
898 neigh_release(neigh);
899 if (do_tx_error)
900 goto tx_error;
901 }
902
903 flowi4_init_output(&fl4, tunnel->parms.link, tunnel->fwmark,
904 RT_TOS(tos), RT_SCOPE_UNIVERSE, IPPROTO_IPV6,
905 0, dst, tiph->saddr, 0, 0,
906 sock_net_uid(tunnel->net, NULL));
907 rt = ip_route_output_flow(tunnel->net, &fl4, NULL);
908
909 if (IS_ERR(rt)) {
910 dev->stats.tx_carrier_errors++;
911 goto tx_error_icmp;
912 }
913 if (rt->rt_type != RTN_UNICAST) {
914 ip_rt_put(rt);
915 dev->stats.tx_carrier_errors++;
916 goto tx_error_icmp;
917 }
918 tdev = rt->dst.dev;
919
920 if (tdev == dev) {
921 ip_rt_put(rt);
922 dev->stats.collisions++;
923 goto tx_error;
924 }
925
926 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) {
927 ip_rt_put(rt);
928 goto tx_error;
929 }
930
931 if (df) {
932 mtu = dst_mtu(&rt->dst) - t_hlen;
933
934 if (mtu < 68) {
935 dev->stats.collisions++;
936 ip_rt_put(rt);
937 goto tx_error;
938 }
939
940 if (mtu < IPV6_MIN_MTU) {
941 mtu = IPV6_MIN_MTU;
942 df = 0;
943 }
944
945 if (tunnel->parms.iph.daddr)
946 skb_dst_update_pmtu_no_confirm(skb, mtu);
947
948 if (skb->len > mtu && !skb_is_gso(skb)) {
949 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
950 ip_rt_put(rt);
951 goto tx_error;
952 }
953 }
954
955 if (tunnel->err_count > 0) {
956 if (time_before(jiffies,
957 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
958 tunnel->err_count--;
959 dst_link_failure(skb);
960 } else
961 tunnel->err_count = 0;
962 }
963
964 /*
965 * Okay, now see if we can stuff it in the buffer as-is.
966 */
967 max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen;
968
969 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
970 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
971 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
972 if (!new_skb) {
973 ip_rt_put(rt);
974 dev->stats.tx_dropped++;
975 kfree_skb(skb);
976 return NETDEV_TX_OK;
977 }
978 if (skb->sk)
979 skb_set_owner_w(new_skb, skb->sk);
980 dev_kfree_skb(skb);
981 skb = new_skb;
982 iph6 = ipv6_hdr(skb);
983 }
984 ttl = tiph->ttl;
985 if (ttl == 0)
986 ttl = iph6->hop_limit;
987 tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
988
989 if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) {
990 ip_rt_put(rt);
991 goto tx_error;
992 }
993
994 skb_set_inner_ipproto(skb, IPPROTO_IPV6);
995
996 iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl,
997 df, !net_eq(tunnel->net, dev_net(dev)));
998 return NETDEV_TX_OK;
999
1000 tx_error_icmp:
1001 dst_link_failure(skb);
1002 tx_error:
1003 kfree_skb(skb);
1004 dev->stats.tx_errors++;
1005 return NETDEV_TX_OK;
1006 }
1007
1008 static netdev_tx_t sit_tunnel_xmit__(struct sk_buff *skb,
1009 struct net_device *dev, u8 ipproto)
1010 {
1011 struct ip_tunnel *tunnel = netdev_priv(dev);
1012 const struct iphdr *tiph = &tunnel->parms.iph;
1013
1014 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4))
1015 goto tx_error;
1016
1017 skb_set_inner_ipproto(skb, ipproto);
1018
1019 ip_tunnel_xmit(skb, dev, tiph, ipproto);
1020 return NETDEV_TX_OK;
1021 tx_error:
1022 kfree_skb(skb);
1023 dev->stats.tx_errors++;
1024 return NETDEV_TX_OK;
1025 }
1026
1027 static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb,
1028 struct net_device *dev)
1029 {
1030 if (!pskb_inet_may_pull(skb))
1031 goto tx_err;
1032
1033 switch (skb->protocol) {
1034 case htons(ETH_P_IP):
1035 sit_tunnel_xmit__(skb, dev, IPPROTO_IPIP);
1036 break;
1037 case htons(ETH_P_IPV6):
1038 ipip6_tunnel_xmit(skb, dev);
1039 break;
1040 #if IS_ENABLED(CONFIG_MPLS)
1041 case htons(ETH_P_MPLS_UC):
1042 sit_tunnel_xmit__(skb, dev, IPPROTO_MPLS);
1043 break;
1044 #endif
1045 default:
1046 goto tx_err;
1047 }
1048
1049 return NETDEV_TX_OK;
1050
1051 tx_err:
1052 dev->stats.tx_errors++;
1053 kfree_skb(skb);
1054 return NETDEV_TX_OK;
1055
1056 }
1057
1058 static void ipip6_tunnel_bind_dev(struct net_device *dev)
1059 {
1060 struct net_device *tdev = NULL;
1061 struct ip_tunnel *tunnel;
1062 const struct iphdr *iph;
1063 struct flowi4 fl4;
1064
1065 tunnel = netdev_priv(dev);
1066 iph = &tunnel->parms.iph;
1067
1068 if (iph->daddr) {
1069 struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4,
1070 NULL,
1071 iph->daddr, iph->saddr,
1072 0, 0,
1073 IPPROTO_IPV6,
1074 RT_TOS(iph->tos),
1075 tunnel->parms.link);
1076
1077 if (!IS_ERR(rt)) {
1078 tdev = rt->dst.dev;
1079 ip_rt_put(rt);
1080 }
1081 dev->flags |= IFF_POINTOPOINT;
1082 }
1083
1084 if (!tdev && tunnel->parms.link)
1085 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link);
1086
1087 if (tdev && !netif_is_l3_master(tdev)) {
1088 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
1089
1090 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
1091 dev->mtu = tdev->mtu - t_hlen;
1092 if (dev->mtu < IPV6_MIN_MTU)
1093 dev->mtu = IPV6_MIN_MTU;
1094 }
1095 }
1096
1097 static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p,
1098 __u32 fwmark)
1099 {
1100 struct net *net = t->net;
1101 struct sit_net *sitn = net_generic(net, sit_net_id);
1102
1103 ipip6_tunnel_unlink(sitn, t);
1104 synchronize_net();
1105 t->parms.iph.saddr = p->iph.saddr;
1106 t->parms.iph.daddr = p->iph.daddr;
1107 memcpy(t->dev->dev_addr, &p->iph.saddr, 4);
1108 memcpy(t->dev->broadcast, &p->iph.daddr, 4);
1109 ipip6_tunnel_link(sitn, t);
1110 t->parms.iph.ttl = p->iph.ttl;
1111 t->parms.iph.tos = p->iph.tos;
1112 t->parms.iph.frag_off = p->iph.frag_off;
1113 if (t->parms.link != p->link || t->fwmark != fwmark) {
1114 t->parms.link = p->link;
1115 t->fwmark = fwmark;
1116 ipip6_tunnel_bind_dev(t->dev);
1117 }
1118 dst_cache_reset(&t->dst_cache);
1119 netdev_state_change(t->dev);
1120 }
1121
1122 #ifdef CONFIG_IPV6_SIT_6RD
1123 static int ipip6_tunnel_update_6rd(struct ip_tunnel *t,
1124 struct ip_tunnel_6rd *ip6rd)
1125 {
1126 struct in6_addr prefix;
1127 __be32 relay_prefix;
1128
1129 if (ip6rd->relay_prefixlen > 32 ||
1130 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64)
1131 return -EINVAL;
1132
1133 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen);
1134 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix))
1135 return -EINVAL;
1136 if (ip6rd->relay_prefixlen)
1137 relay_prefix = ip6rd->relay_prefix &
1138 htonl(0xffffffffUL <<
1139 (32 - ip6rd->relay_prefixlen));
1140 else
1141 relay_prefix = 0;
1142 if (relay_prefix != ip6rd->relay_prefix)
1143 return -EINVAL;
1144
1145 t->ip6rd.prefix = prefix;
1146 t->ip6rd.relay_prefix = relay_prefix;
1147 t->ip6rd.prefixlen = ip6rd->prefixlen;
1148 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen;
1149 dst_cache_reset(&t->dst_cache);
1150 netdev_state_change(t->dev);
1151 return 0;
1152 }
1153 #endif
1154
1155 static bool ipip6_valid_ip_proto(u8 ipproto)
1156 {
1157 return ipproto == IPPROTO_IPV6 ||
1158 ipproto == IPPROTO_IPIP ||
1159 #if IS_ENABLED(CONFIG_MPLS)
1160 ipproto == IPPROTO_MPLS ||
1161 #endif
1162 ipproto == 0;
1163 }
1164
1165 static int
1166 ipip6_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1167 {
1168 int err = 0;
1169 struct ip_tunnel_parm p;
1170 struct ip_tunnel_prl prl;
1171 struct ip_tunnel *t = netdev_priv(dev);
1172 struct net *net = t->net;
1173 struct sit_net *sitn = net_generic(net, sit_net_id);
1174 #ifdef CONFIG_IPV6_SIT_6RD
1175 struct ip_tunnel_6rd ip6rd;
1176 #endif
1177
1178 switch (cmd) {
1179 case SIOCGETTUNNEL:
1180 #ifdef CONFIG_IPV6_SIT_6RD
1181 case SIOCGET6RD:
1182 #endif
1183 if (dev == sitn->fb_tunnel_dev) {
1184 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1185 err = -EFAULT;
1186 break;
1187 }
1188 t = ipip6_tunnel_locate(net, &p, 0);
1189 if (!t)
1190 t = netdev_priv(dev);
1191 }
1192
1193 err = -EFAULT;
1194 if (cmd == SIOCGETTUNNEL) {
1195 memcpy(&p, &t->parms, sizeof(p));
1196 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p,
1197 sizeof(p)))
1198 goto done;
1199 #ifdef CONFIG_IPV6_SIT_6RD
1200 } else {
1201 ip6rd.prefix = t->ip6rd.prefix;
1202 ip6rd.relay_prefix = t->ip6rd.relay_prefix;
1203 ip6rd.prefixlen = t->ip6rd.prefixlen;
1204 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;
1205 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd,
1206 sizeof(ip6rd)))
1207 goto done;
1208 #endif
1209 }
1210 err = 0;
1211 break;
1212
1213 case SIOCADDTUNNEL:
1214 case SIOCCHGTUNNEL:
1215 err = -EPERM;
1216 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1217 goto done;
1218
1219 err = -EFAULT;
1220 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1221 goto done;
1222
1223 err = -EINVAL;
1224 if (!ipip6_valid_ip_proto(p.iph.protocol))
1225 goto done;
1226 if (p.iph.version != 4 ||
1227 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
1228 goto done;
1229 if (p.iph.ttl)
1230 p.iph.frag_off |= htons(IP_DF);
1231
1232 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
1233
1234 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1235 if (t) {
1236 if (t->dev != dev) {
1237 err = -EEXIST;
1238 break;
1239 }
1240 } else {
1241 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
1242 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
1243 err = -EINVAL;
1244 break;
1245 }
1246 t = netdev_priv(dev);
1247 }
1248
1249 ipip6_tunnel_update(t, &p, t->fwmark);
1250 }
1251
1252 if (t) {
1253 err = 0;
1254 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
1255 err = -EFAULT;
1256 } else
1257 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1258 break;
1259
1260 case SIOCDELTUNNEL:
1261 err = -EPERM;
1262 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1263 goto done;
1264
1265 if (dev == sitn->fb_tunnel_dev) {
1266 err = -EFAULT;
1267 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1268 goto done;
1269 err = -ENOENT;
1270 t = ipip6_tunnel_locate(net, &p, 0);
1271 if (!t)
1272 goto done;
1273 err = -EPERM;
1274 if (t == netdev_priv(sitn->fb_tunnel_dev))
1275 goto done;
1276 dev = t->dev;
1277 }
1278 unregister_netdevice(dev);
1279 err = 0;
1280 break;
1281
1282 case SIOCGETPRL:
1283 err = -EINVAL;
1284 if (dev == sitn->fb_tunnel_dev)
1285 goto done;
1286 err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data);
1287 break;
1288
1289 case SIOCADDPRL:
1290 case SIOCDELPRL:
1291 case SIOCCHGPRL:
1292 err = -EPERM;
1293 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1294 goto done;
1295 err = -EINVAL;
1296 if (dev == sitn->fb_tunnel_dev)
1297 goto done;
1298 err = -EFAULT;
1299 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
1300 goto done;
1301
1302 switch (cmd) {
1303 case SIOCDELPRL:
1304 err = ipip6_tunnel_del_prl(t, &prl);
1305 break;
1306 case SIOCADDPRL:
1307 case SIOCCHGPRL:
1308 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
1309 break;
1310 }
1311 dst_cache_reset(&t->dst_cache);
1312 netdev_state_change(dev);
1313 break;
1314
1315 #ifdef CONFIG_IPV6_SIT_6RD
1316 case SIOCADD6RD:
1317 case SIOCCHG6RD:
1318 case SIOCDEL6RD:
1319 err = -EPERM;
1320 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1321 goto done;
1322
1323 err = -EFAULT;
1324 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data,
1325 sizeof(ip6rd)))
1326 goto done;
1327
1328 if (cmd != SIOCDEL6RD) {
1329 err = ipip6_tunnel_update_6rd(t, &ip6rd);
1330 if (err < 0)
1331 goto done;
1332 } else
1333 ipip6_tunnel_clone_6rd(dev, sitn);
1334
1335 err = 0;
1336 break;
1337 #endif
1338
1339 default:
1340 err = -EINVAL;
1341 }
1342
1343 done:
1344 return err;
1345 }
1346
1347 static const struct net_device_ops ipip6_netdev_ops = {
1348 .ndo_init = ipip6_tunnel_init,
1349 .ndo_uninit = ipip6_tunnel_uninit,
1350 .ndo_start_xmit = sit_tunnel_xmit,
1351 .ndo_do_ioctl = ipip6_tunnel_ioctl,
1352 .ndo_get_stats64 = ip_tunnel_get_stats64,
1353 .ndo_get_iflink = ip_tunnel_get_iflink,
1354 };
1355
1356 static void ipip6_dev_free(struct net_device *dev)
1357 {
1358 struct ip_tunnel *tunnel = netdev_priv(dev);
1359
1360 dst_cache_destroy(&tunnel->dst_cache);
1361 free_percpu(dev->tstats);
1362 }
1363
1364 #define SIT_FEATURES (NETIF_F_SG | \
1365 NETIF_F_FRAGLIST | \
1366 NETIF_F_HIGHDMA | \
1367 NETIF_F_GSO_SOFTWARE | \
1368 NETIF_F_HW_CSUM)
1369
1370 static void ipip6_tunnel_setup(struct net_device *dev)
1371 {
1372 struct ip_tunnel *tunnel = netdev_priv(dev);
1373 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
1374
1375 dev->netdev_ops = &ipip6_netdev_ops;
1376 dev->needs_free_netdev = true;
1377 dev->priv_destructor = ipip6_dev_free;
1378
1379 dev->type = ARPHRD_SIT;
1380 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1381 dev->mtu = ETH_DATA_LEN - t_hlen;
1382 dev->min_mtu = IPV6_MIN_MTU;
1383 dev->max_mtu = IP6_MAX_MTU - t_hlen;
1384 dev->flags = IFF_NOARP;
1385 netif_keep_dst(dev);
1386 dev->addr_len = 4;
1387 dev->features |= NETIF_F_LLTX;
1388 dev->features |= SIT_FEATURES;
1389 dev->hw_features |= SIT_FEATURES;
1390 }
1391
1392 static int ipip6_tunnel_init(struct net_device *dev)
1393 {
1394 struct ip_tunnel *tunnel = netdev_priv(dev);
1395 int err;
1396
1397 tunnel->dev = dev;
1398 tunnel->net = dev_net(dev);
1399 strcpy(tunnel->parms.name, dev->name);
1400
1401 ipip6_tunnel_bind_dev(dev);
1402 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1403 if (!dev->tstats)
1404 return -ENOMEM;
1405
1406 err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1407 if (err) {
1408 free_percpu(dev->tstats);
1409 dev->tstats = NULL;
1410 return err;
1411 }
1412
1413 return 0;
1414 }
1415
1416 static void __net_init ipip6_fb_tunnel_init(struct net_device *dev)
1417 {
1418 struct ip_tunnel *tunnel = netdev_priv(dev);
1419 struct iphdr *iph = &tunnel->parms.iph;
1420 struct net *net = dev_net(dev);
1421 struct sit_net *sitn = net_generic(net, sit_net_id);
1422
1423 iph->version = 4;
1424 iph->protocol = IPPROTO_IPV6;
1425 iph->ihl = 5;
1426 iph->ttl = 64;
1427
1428 dev_hold(dev);
1429 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel);
1430 }
1431
1432 static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[],
1433 struct netlink_ext_ack *extack)
1434 {
1435 u8 proto;
1436
1437 if (!data || !data[IFLA_IPTUN_PROTO])
1438 return 0;
1439
1440 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1441 if (!ipip6_valid_ip_proto(proto))
1442 return -EINVAL;
1443
1444 return 0;
1445 }
1446
1447 static void ipip6_netlink_parms(struct nlattr *data[],
1448 struct ip_tunnel_parm *parms,
1449 __u32 *fwmark)
1450 {
1451 memset(parms, 0, sizeof(*parms));
1452
1453 parms->iph.version = 4;
1454 parms->iph.protocol = IPPROTO_IPV6;
1455 parms->iph.ihl = 5;
1456 parms->iph.ttl = 64;
1457
1458 if (!data)
1459 return;
1460
1461 if (data[IFLA_IPTUN_LINK])
1462 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1463
1464 if (data[IFLA_IPTUN_LOCAL])
1465 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]);
1466
1467 if (data[IFLA_IPTUN_REMOTE])
1468 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]);
1469
1470 if (data[IFLA_IPTUN_TTL]) {
1471 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
1472 if (parms->iph.ttl)
1473 parms->iph.frag_off = htons(IP_DF);
1474 }
1475
1476 if (data[IFLA_IPTUN_TOS])
1477 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
1478
1479 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
1480 parms->iph.frag_off = htons(IP_DF);
1481
1482 if (data[IFLA_IPTUN_FLAGS])
1483 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]);
1484
1485 if (data[IFLA_IPTUN_PROTO])
1486 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1487
1488 if (data[IFLA_IPTUN_FWMARK])
1489 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
1490 }
1491
1492 /* This function returns true when ENCAP attributes are present in the nl msg */
1493 static bool ipip6_netlink_encap_parms(struct nlattr *data[],
1494 struct ip_tunnel_encap *ipencap)
1495 {
1496 bool ret = false;
1497
1498 memset(ipencap, 0, sizeof(*ipencap));
1499
1500 if (!data)
1501 return ret;
1502
1503 if (data[IFLA_IPTUN_ENCAP_TYPE]) {
1504 ret = true;
1505 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
1506 }
1507
1508 if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
1509 ret = true;
1510 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
1511 }
1512
1513 if (data[IFLA_IPTUN_ENCAP_SPORT]) {
1514 ret = true;
1515 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
1516 }
1517
1518 if (data[IFLA_IPTUN_ENCAP_DPORT]) {
1519 ret = true;
1520 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
1521 }
1522
1523 return ret;
1524 }
1525
1526 #ifdef CONFIG_IPV6_SIT_6RD
1527 /* This function returns true when 6RD attributes are present in the nl msg */
1528 static bool ipip6_netlink_6rd_parms(struct nlattr *data[],
1529 struct ip_tunnel_6rd *ip6rd)
1530 {
1531 bool ret = false;
1532 memset(ip6rd, 0, sizeof(*ip6rd));
1533
1534 if (!data)
1535 return ret;
1536
1537 if (data[IFLA_IPTUN_6RD_PREFIX]) {
1538 ret = true;
1539 ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]);
1540 }
1541
1542 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) {
1543 ret = true;
1544 ip6rd->relay_prefix =
1545 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]);
1546 }
1547
1548 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) {
1549 ret = true;
1550 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]);
1551 }
1552
1553 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) {
1554 ret = true;
1555 ip6rd->relay_prefixlen =
1556 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
1557 }
1558
1559 return ret;
1560 }
1561 #endif
1562
1563 static int ipip6_newlink(struct net *src_net, struct net_device *dev,
1564 struct nlattr *tb[], struct nlattr *data[],
1565 struct netlink_ext_ack *extack)
1566 {
1567 struct net *net = dev_net(dev);
1568 struct ip_tunnel *nt;
1569 struct ip_tunnel_encap ipencap;
1570 #ifdef CONFIG_IPV6_SIT_6RD
1571 struct ip_tunnel_6rd ip6rd;
1572 #endif
1573 int err;
1574
1575 nt = netdev_priv(dev);
1576
1577 if (ipip6_netlink_encap_parms(data, &ipencap)) {
1578 err = ip_tunnel_encap_setup(nt, &ipencap);
1579 if (err < 0)
1580 return err;
1581 }
1582
1583 ipip6_netlink_parms(data, &nt->parms, &nt->fwmark);
1584
1585 if (ipip6_tunnel_locate(net, &nt->parms, 0))
1586 return -EEXIST;
1587
1588 err = ipip6_tunnel_create(dev);
1589 if (err < 0)
1590 return err;
1591
1592 if (tb[IFLA_MTU]) {
1593 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
1594
1595 if (mtu >= IPV6_MIN_MTU &&
1596 mtu <= IP6_MAX_MTU - dev->hard_header_len)
1597 dev->mtu = mtu;
1598 }
1599
1600 #ifdef CONFIG_IPV6_SIT_6RD
1601 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1602 err = ipip6_tunnel_update_6rd(nt, &ip6rd);
1603 #endif
1604
1605 return err;
1606 }
1607
1608 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[],
1609 struct nlattr *data[],
1610 struct netlink_ext_ack *extack)
1611 {
1612 struct ip_tunnel *t = netdev_priv(dev);
1613 struct ip_tunnel_parm p;
1614 struct ip_tunnel_encap ipencap;
1615 struct net *net = t->net;
1616 struct sit_net *sitn = net_generic(net, sit_net_id);
1617 #ifdef CONFIG_IPV6_SIT_6RD
1618 struct ip_tunnel_6rd ip6rd;
1619 #endif
1620 __u32 fwmark = t->fwmark;
1621 int err;
1622
1623 if (dev == sitn->fb_tunnel_dev)
1624 return -EINVAL;
1625
1626 if (ipip6_netlink_encap_parms(data, &ipencap)) {
1627 err = ip_tunnel_encap_setup(t, &ipencap);
1628 if (err < 0)
1629 return err;
1630 }
1631
1632 ipip6_netlink_parms(data, &p, &fwmark);
1633
1634 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
1635 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
1636 return -EINVAL;
1637
1638 t = ipip6_tunnel_locate(net, &p, 0);
1639
1640 if (t) {
1641 if (t->dev != dev)
1642 return -EEXIST;
1643 } else
1644 t = netdev_priv(dev);
1645
1646 ipip6_tunnel_update(t, &p, fwmark);
1647
1648 #ifdef CONFIG_IPV6_SIT_6RD
1649 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1650 return ipip6_tunnel_update_6rd(t, &ip6rd);
1651 #endif
1652
1653 return 0;
1654 }
1655
1656 static size_t ipip6_get_size(const struct net_device *dev)
1657 {
1658 return
1659 /* IFLA_IPTUN_LINK */
1660 nla_total_size(4) +
1661 /* IFLA_IPTUN_LOCAL */
1662 nla_total_size(4) +
1663 /* IFLA_IPTUN_REMOTE */
1664 nla_total_size(4) +
1665 /* IFLA_IPTUN_TTL */
1666 nla_total_size(1) +
1667 /* IFLA_IPTUN_TOS */
1668 nla_total_size(1) +
1669 /* IFLA_IPTUN_PMTUDISC */
1670 nla_total_size(1) +
1671 /* IFLA_IPTUN_FLAGS */
1672 nla_total_size(2) +
1673 /* IFLA_IPTUN_PROTO */
1674 nla_total_size(1) +
1675 #ifdef CONFIG_IPV6_SIT_6RD
1676 /* IFLA_IPTUN_6RD_PREFIX */
1677 nla_total_size(sizeof(struct in6_addr)) +
1678 /* IFLA_IPTUN_6RD_RELAY_PREFIX */
1679 nla_total_size(4) +
1680 /* IFLA_IPTUN_6RD_PREFIXLEN */
1681 nla_total_size(2) +
1682 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */
1683 nla_total_size(2) +
1684 #endif
1685 /* IFLA_IPTUN_ENCAP_TYPE */
1686 nla_total_size(2) +
1687 /* IFLA_IPTUN_ENCAP_FLAGS */
1688 nla_total_size(2) +
1689 /* IFLA_IPTUN_ENCAP_SPORT */
1690 nla_total_size(2) +
1691 /* IFLA_IPTUN_ENCAP_DPORT */
1692 nla_total_size(2) +
1693 /* IFLA_IPTUN_FWMARK */
1694 nla_total_size(4) +
1695 0;
1696 }
1697
1698 static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1699 {
1700 struct ip_tunnel *tunnel = netdev_priv(dev);
1701 struct ip_tunnel_parm *parm = &tunnel->parms;
1702
1703 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
1704 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
1705 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
1706 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
1707 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
1708 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
1709 !!(parm->iph.frag_off & htons(IP_DF))) ||
1710 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
1711 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags) ||
1712 nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark))
1713 goto nla_put_failure;
1714
1715 #ifdef CONFIG_IPV6_SIT_6RD
1716 if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX,
1717 &tunnel->ip6rd.prefix) ||
1718 nla_put_in_addr(skb, IFLA_IPTUN_6RD_RELAY_PREFIX,
1719 tunnel->ip6rd.relay_prefix) ||
1720 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN,
1721 tunnel->ip6rd.prefixlen) ||
1722 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
1723 tunnel->ip6rd.relay_prefixlen))
1724 goto nla_put_failure;
1725 #endif
1726
1727 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE,
1728 tunnel->encap.type) ||
1729 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT,
1730 tunnel->encap.sport) ||
1731 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT,
1732 tunnel->encap.dport) ||
1733 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS,
1734 tunnel->encap.flags))
1735 goto nla_put_failure;
1736
1737 return 0;
1738
1739 nla_put_failure:
1740 return -EMSGSIZE;
1741 }
1742
1743 static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = {
1744 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1745 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 },
1746 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 },
1747 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1748 [IFLA_IPTUN_TOS] = { .type = NLA_U8 },
1749 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 },
1750 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 },
1751 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
1752 #ifdef CONFIG_IPV6_SIT_6RD
1753 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) },
1754 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 },
1755 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 },
1756 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 },
1757 #endif
1758 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
1759 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
1760 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
1761 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
1762 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
1763 };
1764
1765 static void ipip6_dellink(struct net_device *dev, struct list_head *head)
1766 {
1767 struct net *net = dev_net(dev);
1768 struct sit_net *sitn = net_generic(net, sit_net_id);
1769
1770 if (dev != sitn->fb_tunnel_dev)
1771 unregister_netdevice_queue(dev, head);
1772 }
1773
1774 static struct rtnl_link_ops sit_link_ops __read_mostly = {
1775 .kind = "sit",
1776 .maxtype = IFLA_IPTUN_MAX,
1777 .policy = ipip6_policy,
1778 .priv_size = sizeof(struct ip_tunnel),
1779 .setup = ipip6_tunnel_setup,
1780 .validate = ipip6_validate,
1781 .newlink = ipip6_newlink,
1782 .changelink = ipip6_changelink,
1783 .get_size = ipip6_get_size,
1784 .fill_info = ipip6_fill_info,
1785 .dellink = ipip6_dellink,
1786 .get_link_net = ip_tunnel_get_link_net,
1787 };
1788
1789 static struct xfrm_tunnel sit_handler __read_mostly = {
1790 .handler = ipip6_rcv,
1791 .err_handler = ipip6_err,
1792 .priority = 1,
1793 };
1794
1795 static struct xfrm_tunnel ipip_handler __read_mostly = {
1796 .handler = ipip_rcv,
1797 .err_handler = ipip6_err,
1798 .priority = 2,
1799 };
1800
1801 #if IS_ENABLED(CONFIG_MPLS)
1802 static struct xfrm_tunnel mplsip_handler __read_mostly = {
1803 .handler = mplsip_rcv,
1804 .err_handler = ipip6_err,
1805 .priority = 2,
1806 };
1807 #endif
1808
1809 static void __net_exit sit_destroy_tunnels(struct net *net,
1810 struct list_head *head)
1811 {
1812 struct sit_net *sitn = net_generic(net, sit_net_id);
1813 struct net_device *dev, *aux;
1814 int prio;
1815
1816 for_each_netdev_safe(net, dev, aux)
1817 if (dev->rtnl_link_ops == &sit_link_ops)
1818 unregister_netdevice_queue(dev, head);
1819
1820 for (prio = 1; prio < 4; prio++) {
1821 int h;
1822 for (h = 0; h < IP6_SIT_HASH_SIZE; h++) {
1823 struct ip_tunnel *t;
1824
1825 t = rtnl_dereference(sitn->tunnels[prio][h]);
1826 while (t) {
1827 /* If dev is in the same netns, it has already
1828 * been added to the list by the previous loop.
1829 */
1830 if (!net_eq(dev_net(t->dev), net))
1831 unregister_netdevice_queue(t->dev,
1832 head);
1833 t = rtnl_dereference(t->next);
1834 }
1835 }
1836 }
1837 }
1838
1839 static int __net_init sit_init_net(struct net *net)
1840 {
1841 struct sit_net *sitn = net_generic(net, sit_net_id);
1842 struct ip_tunnel *t;
1843 int err;
1844
1845 sitn->tunnels[0] = sitn->tunnels_wc;
1846 sitn->tunnels[1] = sitn->tunnels_l;
1847 sitn->tunnels[2] = sitn->tunnels_r;
1848 sitn->tunnels[3] = sitn->tunnels_r_l;
1849
1850 if (!net_has_fallback_tunnels(net))
1851 return 0;
1852
1853 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
1854 NET_NAME_UNKNOWN,
1855 ipip6_tunnel_setup);
1856 if (!sitn->fb_tunnel_dev) {
1857 err = -ENOMEM;
1858 goto err_alloc_dev;
1859 }
1860 dev_net_set(sitn->fb_tunnel_dev, net);
1861 sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops;
1862 /* FB netdevice is special: we have one, and only one per netns.
1863 * Allowing to move it to another netns is clearly unsafe.
1864 */
1865 sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1866
1867 err = register_netdev(sitn->fb_tunnel_dev);
1868 if (err)
1869 goto err_reg_dev;
1870
1871 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
1872 ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
1873
1874 t = netdev_priv(sitn->fb_tunnel_dev);
1875
1876 strcpy(t->parms.name, sitn->fb_tunnel_dev->name);
1877 return 0;
1878
1879 err_reg_dev:
1880 ipip6_dev_free(sitn->fb_tunnel_dev);
1881 free_netdev(sitn->fb_tunnel_dev);
1882 err_alloc_dev:
1883 return err;
1884 }
1885
1886 static void __net_exit sit_exit_batch_net(struct list_head *net_list)
1887 {
1888 LIST_HEAD(list);
1889 struct net *net;
1890
1891 rtnl_lock();
1892 list_for_each_entry(net, net_list, exit_list)
1893 sit_destroy_tunnels(net, &list);
1894
1895 unregister_netdevice_many(&list);
1896 rtnl_unlock();
1897 }
1898
1899 static struct pernet_operations sit_net_ops = {
1900 .init = sit_init_net,
1901 .exit_batch = sit_exit_batch_net,
1902 .id = &sit_net_id,
1903 .size = sizeof(struct sit_net),
1904 };
1905
1906 static void __exit sit_cleanup(void)
1907 {
1908 rtnl_link_unregister(&sit_link_ops);
1909 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1910 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
1911 #if IS_ENABLED(CONFIG_MPLS)
1912 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS);
1913 #endif
1914
1915 unregister_pernet_device(&sit_net_ops);
1916 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1917 }
1918
1919 static int __init sit_init(void)
1920 {
1921 int err;
1922
1923 pr_info("IPv6, IPv4 and MPLS over IPv4 tunneling driver\n");
1924
1925 err = register_pernet_device(&sit_net_ops);
1926 if (err < 0)
1927 return err;
1928 err = xfrm4_tunnel_register(&sit_handler, AF_INET6);
1929 if (err < 0) {
1930 pr_info("%s: can't register ip6ip4\n", __func__);
1931 goto xfrm_tunnel_failed;
1932 }
1933 err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
1934 if (err < 0) {
1935 pr_info("%s: can't register ip4ip4\n", __func__);
1936 goto xfrm_tunnel4_failed;
1937 }
1938 #if IS_ENABLED(CONFIG_MPLS)
1939 err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS);
1940 if (err < 0) {
1941 pr_info("%s: can't register mplsip\n", __func__);
1942 goto xfrm_tunnel_mpls_failed;
1943 }
1944 #endif
1945 err = rtnl_link_register(&sit_link_ops);
1946 if (err < 0)
1947 goto rtnl_link_failed;
1948
1949 out:
1950 return err;
1951
1952 rtnl_link_failed:
1953 #if IS_ENABLED(CONFIG_MPLS)
1954 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS);
1955 xfrm_tunnel_mpls_failed:
1956 #endif
1957 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
1958 xfrm_tunnel4_failed:
1959 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1960 xfrm_tunnel_failed:
1961 unregister_pernet_device(&sit_net_ops);
1962 goto out;
1963 }
1964
1965 module_init(sit_init);
1966 module_exit(sit_cleanup);
1967 MODULE_LICENSE("GPL");
1968 MODULE_ALIAS_RTNL_LINK("sit");
1969 MODULE_ALIAS_NETDEV("sit0");
Linux with added FPC-III support