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[mirror_ubuntu-jammy-kernel.git] / net / ipv6 / sit.c
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 (t->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 strlcpy(name, parms->name, IFNAMSIZ);
255 else
256 strcpy(name, "sit%d");
257
258 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
259 ipip6_tunnel_setup);
260 if (!dev)
261 return NULL;
262
263 dev_net_set(dev, net);
264
265 nt = netdev_priv(dev);
266
267 nt->parms = *parms;
268 if (ipip6_tunnel_create(dev) < 0)
269 goto failed_free;
270
271 return nt;
272
273 failed_free:
274 free_netdev(dev);
275 failed:
276 return NULL;
277 }
278
279 #define for_each_prl_rcu(start) \
280 for (prl = rcu_dereference(start); \
281 prl; \
282 prl = rcu_dereference(prl->next))
283
284 static struct ip_tunnel_prl_entry *
285 __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
286 {
287 struct ip_tunnel_prl_entry *prl;
288
289 for_each_prl_rcu(t->prl)
290 if (prl->addr == addr)
291 break;
292 return prl;
293
294 }
295
296 static int ipip6_tunnel_get_prl(struct ip_tunnel *t,
297 struct ip_tunnel_prl __user *a)
298 {
299 struct ip_tunnel_prl kprl, *kp;
300 struct ip_tunnel_prl_entry *prl;
301 unsigned int cmax, c = 0, ca, len;
302 int ret = 0;
303
304 if (copy_from_user(&kprl, a, sizeof(kprl)))
305 return -EFAULT;
306 cmax = kprl.datalen / sizeof(kprl);
307 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY))
308 cmax = 1;
309
310 /* For simple GET or for root users,
311 * we try harder to allocate.
312 */
313 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
314 kcalloc(cmax, sizeof(*kp), GFP_KERNEL | __GFP_NOWARN) :
315 NULL;
316
317 rcu_read_lock();
318
319 ca = t->prl_count < cmax ? t->prl_count : cmax;
320
321 if (!kp) {
322 /* We don't try hard to allocate much memory for
323 * non-root users.
324 * For root users, retry allocating enough memory for
325 * the answer.
326 */
327 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC);
328 if (!kp) {
329 ret = -ENOMEM;
330 goto out;
331 }
332 }
333
334 c = 0;
335 for_each_prl_rcu(t->prl) {
336 if (c >= cmax)
337 break;
338 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr)
339 continue;
340 kp[c].addr = prl->addr;
341 kp[c].flags = prl->flags;
342 c++;
343 if (kprl.addr != htonl(INADDR_ANY))
344 break;
345 }
346 out:
347 rcu_read_unlock();
348
349 len = sizeof(*kp) * c;
350 ret = 0;
351 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen))
352 ret = -EFAULT;
353
354 kfree(kp);
355
356 return ret;
357 }
358
359 static int
360 ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
361 {
362 struct ip_tunnel_prl_entry *p;
363 int err = 0;
364
365 if (a->addr == htonl(INADDR_ANY))
366 return -EINVAL;
367
368 ASSERT_RTNL();
369
370 for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) {
371 if (p->addr == a->addr) {
372 if (chg) {
373 p->flags = a->flags;
374 goto out;
375 }
376 err = -EEXIST;
377 goto out;
378 }
379 }
380
381 if (chg) {
382 err = -ENXIO;
383 goto out;
384 }
385
386 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
387 if (!p) {
388 err = -ENOBUFS;
389 goto out;
390 }
391
392 p->next = t->prl;
393 p->addr = a->addr;
394 p->flags = a->flags;
395 t->prl_count++;
396 rcu_assign_pointer(t->prl, p);
397 out:
398 return err;
399 }
400
401 static void prl_list_destroy_rcu(struct rcu_head *head)
402 {
403 struct ip_tunnel_prl_entry *p, *n;
404
405 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head);
406 do {
407 n = rcu_dereference_protected(p->next, 1);
408 kfree(p);
409 p = n;
410 } while (p);
411 }
412
413 static int
414 ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
415 {
416 struct ip_tunnel_prl_entry *x;
417 struct ip_tunnel_prl_entry __rcu **p;
418 int err = 0;
419
420 ASSERT_RTNL();
421
422 if (a && a->addr != htonl(INADDR_ANY)) {
423 for (p = &t->prl;
424 (x = rtnl_dereference(*p)) != NULL;
425 p = &x->next) {
426 if (x->addr == a->addr) {
427 *p = x->next;
428 kfree_rcu(x, rcu_head);
429 t->prl_count--;
430 goto out;
431 }
432 }
433 err = -ENXIO;
434 } else {
435 x = rtnl_dereference(t->prl);
436 if (x) {
437 t->prl_count = 0;
438 call_rcu(&x->rcu_head, prl_list_destroy_rcu);
439 t->prl = NULL;
440 }
441 }
442 out:
443 return err;
444 }
445
446 static int
447 isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t)
448 {
449 struct ip_tunnel_prl_entry *p;
450 int ok = 1;
451
452 rcu_read_lock();
453 p = __ipip6_tunnel_locate_prl(t, iph->saddr);
454 if (p) {
455 if (p->flags & PRL_DEFAULT)
456 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
457 else
458 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
459 } else {
460 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
461
462 if (ipv6_addr_is_isatap(addr6) &&
463 (addr6->s6_addr32[3] == iph->saddr) &&
464 ipv6_chk_prefix(addr6, t->dev))
465 skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
466 else
467 ok = 0;
468 }
469 rcu_read_unlock();
470 return ok;
471 }
472
473 static void ipip6_tunnel_uninit(struct net_device *dev)
474 {
475 struct ip_tunnel *tunnel = netdev_priv(dev);
476 struct sit_net *sitn = net_generic(tunnel->net, sit_net_id);
477
478 if (dev == sitn->fb_tunnel_dev) {
479 RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL);
480 } else {
481 ipip6_tunnel_unlink(sitn, tunnel);
482 ipip6_tunnel_del_prl(tunnel, NULL);
483 }
484 dst_cache_reset(&tunnel->dst_cache);
485 dev_put(dev);
486 }
487
488 static int ipip6_err(struct sk_buff *skb, u32 info)
489 {
490 const struct iphdr *iph = (const struct iphdr *)skb->data;
491 const int type = icmp_hdr(skb)->type;
492 const int code = icmp_hdr(skb)->code;
493 unsigned int data_len = 0;
494 struct ip_tunnel *t;
495 int sifindex;
496 int err;
497
498 switch (type) {
499 default:
500 case ICMP_PARAMETERPROB:
501 return 0;
502
503 case ICMP_DEST_UNREACH:
504 switch (code) {
505 case ICMP_SR_FAILED:
506 /* Impossible event. */
507 return 0;
508 default:
509 /* All others are translated to HOST_UNREACH.
510 rfc2003 contains "deep thoughts" about NET_UNREACH,
511 I believe they are just ether pollution. --ANK
512 */
513 break;
514 }
515 break;
516 case ICMP_TIME_EXCEEDED:
517 if (code != ICMP_EXC_TTL)
518 return 0;
519 data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */
520 break;
521 case ICMP_REDIRECT:
522 break;
523 }
524
525 err = -ENOENT;
526
527 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0;
528 t = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
529 iph->daddr, iph->saddr, sifindex);
530 if (!t)
531 goto out;
532
533 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
534 ipv4_update_pmtu(skb, dev_net(skb->dev), info,
535 t->parms.link, 0, iph->protocol, 0);
536 err = 0;
537 goto out;
538 }
539 if (type == ICMP_REDIRECT) {
540 ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 0,
541 iph->protocol, 0);
542 err = 0;
543 goto out;
544 }
545
546 err = 0;
547 if (!ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4, type, data_len))
548 goto out;
549
550 if (t->parms.iph.daddr == 0)
551 goto out;
552
553 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
554 goto out;
555
556 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
557 t->err_count++;
558 else
559 t->err_count = 1;
560 t->err_time = jiffies;
561 out:
562 return err;
563 }
564
565 static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr,
566 const struct in6_addr *v6addr)
567 {
568 __be32 v4embed = 0;
569 if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed)
570 return true;
571 return false;
572 }
573
574 /* Checks if an address matches an address on the tunnel interface.
575 * Used to detect the NAT of proto 41 packets and let them pass spoofing test.
576 * Long story:
577 * This function is called after we considered the packet as spoofed
578 * in is_spoofed_6rd.
579 * We may have a router that is doing NAT for proto 41 packets
580 * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb
581 * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd
582 * function will return true, dropping the packet.
583 * But, we can still check if is spoofed against the IP
584 * addresses associated with the interface.
585 */
586 static bool only_dnatted(const struct ip_tunnel *tunnel,
587 const struct in6_addr *v6dst)
588 {
589 int prefix_len;
590
591 #ifdef CONFIG_IPV6_SIT_6RD
592 prefix_len = tunnel->ip6rd.prefixlen + 32
593 - tunnel->ip6rd.relay_prefixlen;
594 #else
595 prefix_len = 48;
596 #endif
597 return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev);
598 }
599
600 /* Returns true if a packet is spoofed */
601 static bool packet_is_spoofed(struct sk_buff *skb,
602 const struct iphdr *iph,
603 struct ip_tunnel *tunnel)
604 {
605 const struct ipv6hdr *ipv6h;
606
607 if (tunnel->dev->priv_flags & IFF_ISATAP) {
608 if (!isatap_chksrc(skb, iph, tunnel))
609 return true;
610
611 return false;
612 }
613
614 if (tunnel->dev->flags & IFF_POINTOPOINT)
615 return false;
616
617 ipv6h = ipv6_hdr(skb);
618
619 if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) {
620 net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
621 &iph->saddr, &ipv6h->saddr,
622 &iph->daddr, &ipv6h->daddr);
623 return true;
624 }
625
626 if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr)))
627 return false;
628
629 if (only_dnatted(tunnel, &ipv6h->daddr))
630 return false;
631
632 net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
633 &iph->saddr, &ipv6h->saddr,
634 &iph->daddr, &ipv6h->daddr);
635 return true;
636 }
637
638 static int ipip6_rcv(struct sk_buff *skb)
639 {
640 const struct iphdr *iph = ip_hdr(skb);
641 struct ip_tunnel *tunnel;
642 int sifindex;
643 int err;
644
645 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0;
646 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
647 iph->saddr, iph->daddr, sifindex);
648 if (tunnel) {
649 struct pcpu_sw_netstats *tstats;
650
651 if (tunnel->parms.iph.protocol != IPPROTO_IPV6 &&
652 tunnel->parms.iph.protocol != 0)
653 goto out;
654
655 skb->mac_header = skb->network_header;
656 skb_reset_network_header(skb);
657 IPCB(skb)->flags = 0;
658 skb->dev = tunnel->dev;
659
660 if (packet_is_spoofed(skb, iph, tunnel)) {
661 tunnel->dev->stats.rx_errors++;
662 goto out;
663 }
664
665 if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6),
666 !net_eq(tunnel->net, dev_net(tunnel->dev))))
667 goto out;
668
669 err = IP_ECN_decapsulate(iph, skb);
670 if (unlikely(err)) {
671 if (log_ecn_error)
672 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
673 &iph->saddr, iph->tos);
674 if (err > 1) {
675 ++tunnel->dev->stats.rx_frame_errors;
676 ++tunnel->dev->stats.rx_errors;
677 goto out;
678 }
679 }
680
681 tstats = this_cpu_ptr(tunnel->dev->tstats);
682 u64_stats_update_begin(&tstats->syncp);
683 tstats->rx_packets++;
684 tstats->rx_bytes += skb->len;
685 u64_stats_update_end(&tstats->syncp);
686
687 netif_rx(skb);
688
689 return 0;
690 }
691
692 /* no tunnel matched, let upstream know, ipsec may handle it */
693 return 1;
694 out:
695 kfree_skb(skb);
696 return 0;
697 }
698
699 static const struct tnl_ptk_info ipip_tpi = {
700 /* no tunnel info required for ipip. */
701 .proto = htons(ETH_P_IP),
702 };
703
704 #if IS_ENABLED(CONFIG_MPLS)
705 static const struct tnl_ptk_info mplsip_tpi = {
706 /* no tunnel info required for mplsip. */
707 .proto = htons(ETH_P_MPLS_UC),
708 };
709 #endif
710
711 static int sit_tunnel_rcv(struct sk_buff *skb, u8 ipproto)
712 {
713 const struct iphdr *iph;
714 struct ip_tunnel *tunnel;
715 int sifindex;
716
717 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0;
718
719 iph = ip_hdr(skb);
720 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
721 iph->saddr, iph->daddr, sifindex);
722 if (tunnel) {
723 const struct tnl_ptk_info *tpi;
724
725 if (tunnel->parms.iph.protocol != ipproto &&
726 tunnel->parms.iph.protocol != 0)
727 goto drop;
728
729 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
730 goto drop;
731 #if IS_ENABLED(CONFIG_MPLS)
732 if (ipproto == IPPROTO_MPLS)
733 tpi = &mplsip_tpi;
734 else
735 #endif
736 tpi = &ipip_tpi;
737 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
738 goto drop;
739 return ip_tunnel_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
740 }
741
742 return 1;
743
744 drop:
745 kfree_skb(skb);
746 return 0;
747 }
748
749 static int ipip_rcv(struct sk_buff *skb)
750 {
751 return sit_tunnel_rcv(skb, IPPROTO_IPIP);
752 }
753
754 #if IS_ENABLED(CONFIG_MPLS)
755 static int mplsip_rcv(struct sk_buff *skb)
756 {
757 return sit_tunnel_rcv(skb, IPPROTO_MPLS);
758 }
759 #endif
760
761 /*
762 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function
763 * stores the embedded IPv4 address in v4dst and returns true.
764 */
765 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
766 __be32 *v4dst)
767 {
768 #ifdef CONFIG_IPV6_SIT_6RD
769 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix,
770 tunnel->ip6rd.prefixlen)) {
771 unsigned int pbw0, pbi0;
772 int pbi1;
773 u32 d;
774
775 pbw0 = tunnel->ip6rd.prefixlen >> 5;
776 pbi0 = tunnel->ip6rd.prefixlen & 0x1f;
777
778 d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
779 tunnel->ip6rd.relay_prefixlen;
780
781 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;
782 if (pbi1 > 0)
783 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >>
784 (32 - pbi1);
785
786 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d);
787 return true;
788 }
789 #else
790 if (v6dst->s6_addr16[0] == htons(0x2002)) {
791 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
792 memcpy(v4dst, &v6dst->s6_addr16[1], 4);
793 return true;
794 }
795 #endif
796 return false;
797 }
798
799 static inline __be32 try_6rd(struct ip_tunnel *tunnel,
800 const struct in6_addr *v6dst)
801 {
802 __be32 dst = 0;
803 check_6rd(tunnel, v6dst, &dst);
804 return dst;
805 }
806
807 /*
808 * This function assumes it is being called from dev_queue_xmit()
809 * and that skb is filled properly by that function.
810 */
811
812 static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
813 struct net_device *dev)
814 {
815 struct ip_tunnel *tunnel = netdev_priv(dev);
816 const struct iphdr *tiph = &tunnel->parms.iph;
817 const struct ipv6hdr *iph6 = ipv6_hdr(skb);
818 u8 tos = tunnel->parms.iph.tos;
819 __be16 df = tiph->frag_off;
820 struct rtable *rt; /* Route to the other host */
821 struct net_device *tdev; /* Device to other host */
822 unsigned int max_headroom; /* The extra header space needed */
823 __be32 dst = tiph->daddr;
824 struct flowi4 fl4;
825 int mtu;
826 const struct in6_addr *addr6;
827 int addr_type;
828 u8 ttl;
829 u8 protocol = IPPROTO_IPV6;
830 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
831
832 if (tos == 1)
833 tos = ipv6_get_dsfield(iph6);
834
835 /* ISATAP (RFC4214) - must come before 6to4 */
836 if (dev->priv_flags & IFF_ISATAP) {
837 struct neighbour *neigh = NULL;
838 bool do_tx_error = false;
839
840 if (skb_dst(skb))
841 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
842
843 if (!neigh) {
844 net_dbg_ratelimited("nexthop == NULL\n");
845 goto tx_error;
846 }
847
848 addr6 = (const struct in6_addr *)&neigh->primary_key;
849 addr_type = ipv6_addr_type(addr6);
850
851 if ((addr_type & IPV6_ADDR_UNICAST) &&
852 ipv6_addr_is_isatap(addr6))
853 dst = addr6->s6_addr32[3];
854 else
855 do_tx_error = true;
856
857 neigh_release(neigh);
858 if (do_tx_error)
859 goto tx_error;
860 }
861
862 if (!dst)
863 dst = try_6rd(tunnel, &iph6->daddr);
864
865 if (!dst) {
866 struct neighbour *neigh = NULL;
867 bool do_tx_error = false;
868
869 if (skb_dst(skb))
870 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
871
872 if (!neigh) {
873 net_dbg_ratelimited("nexthop == NULL\n");
874 goto tx_error;
875 }
876
877 addr6 = (const struct in6_addr *)&neigh->primary_key;
878 addr_type = ipv6_addr_type(addr6);
879
880 if (addr_type == IPV6_ADDR_ANY) {
881 addr6 = &ipv6_hdr(skb)->daddr;
882 addr_type = ipv6_addr_type(addr6);
883 }
884
885 if ((addr_type & IPV6_ADDR_COMPATv4) != 0)
886 dst = addr6->s6_addr32[3];
887 else
888 do_tx_error = true;
889
890 neigh_release(neigh);
891 if (do_tx_error)
892 goto tx_error;
893 }
894
895 flowi4_init_output(&fl4, tunnel->parms.link, tunnel->fwmark,
896 RT_TOS(tos), RT_SCOPE_UNIVERSE, IPPROTO_IPV6,
897 0, dst, tiph->saddr, 0, 0,
898 sock_net_uid(tunnel->net, NULL));
899 rt = ip_route_output_flow(tunnel->net, &fl4, NULL);
900
901 if (IS_ERR(rt)) {
902 dev->stats.tx_carrier_errors++;
903 goto tx_error_icmp;
904 }
905 if (rt->rt_type != RTN_UNICAST) {
906 ip_rt_put(rt);
907 dev->stats.tx_carrier_errors++;
908 goto tx_error_icmp;
909 }
910 tdev = rt->dst.dev;
911
912 if (tdev == dev) {
913 ip_rt_put(rt);
914 dev->stats.collisions++;
915 goto tx_error;
916 }
917
918 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) {
919 ip_rt_put(rt);
920 goto tx_error;
921 }
922
923 if (df) {
924 mtu = dst_mtu(&rt->dst) - t_hlen;
925
926 if (mtu < 68) {
927 dev->stats.collisions++;
928 ip_rt_put(rt);
929 goto tx_error;
930 }
931
932 if (mtu < IPV6_MIN_MTU) {
933 mtu = IPV6_MIN_MTU;
934 df = 0;
935 }
936
937 if (tunnel->parms.iph.daddr && skb_dst(skb))
938 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
939
940 if (skb->len > mtu && !skb_is_gso(skb)) {
941 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
942 ip_rt_put(rt);
943 goto tx_error;
944 }
945 }
946
947 if (tunnel->err_count > 0) {
948 if (time_before(jiffies,
949 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
950 tunnel->err_count--;
951 dst_link_failure(skb);
952 } else
953 tunnel->err_count = 0;
954 }
955
956 /*
957 * Okay, now see if we can stuff it in the buffer as-is.
958 */
959 max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen;
960
961 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
962 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
963 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
964 if (!new_skb) {
965 ip_rt_put(rt);
966 dev->stats.tx_dropped++;
967 kfree_skb(skb);
968 return NETDEV_TX_OK;
969 }
970 if (skb->sk)
971 skb_set_owner_w(new_skb, skb->sk);
972 dev_kfree_skb(skb);
973 skb = new_skb;
974 iph6 = ipv6_hdr(skb);
975 }
976 ttl = tiph->ttl;
977 if (ttl == 0)
978 ttl = iph6->hop_limit;
979 tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
980
981 if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) {
982 ip_rt_put(rt);
983 goto tx_error;
984 }
985
986 skb_set_inner_ipproto(skb, IPPROTO_IPV6);
987
988 iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl,
989 df, !net_eq(tunnel->net, dev_net(dev)));
990 return NETDEV_TX_OK;
991
992 tx_error_icmp:
993 dst_link_failure(skb);
994 tx_error:
995 kfree_skb(skb);
996 dev->stats.tx_errors++;
997 return NETDEV_TX_OK;
998 }
999
1000 static netdev_tx_t sit_tunnel_xmit__(struct sk_buff *skb,
1001 struct net_device *dev, u8 ipproto)
1002 {
1003 struct ip_tunnel *tunnel = netdev_priv(dev);
1004 const struct iphdr *tiph = &tunnel->parms.iph;
1005
1006 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4))
1007 goto tx_error;
1008
1009 skb_set_inner_ipproto(skb, ipproto);
1010
1011 ip_tunnel_xmit(skb, dev, tiph, ipproto);
1012 return NETDEV_TX_OK;
1013 tx_error:
1014 kfree_skb(skb);
1015 dev->stats.tx_errors++;
1016 return NETDEV_TX_OK;
1017 }
1018
1019 static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb,
1020 struct net_device *dev)
1021 {
1022 switch (skb->protocol) {
1023 case htons(ETH_P_IP):
1024 sit_tunnel_xmit__(skb, dev, IPPROTO_IPIP);
1025 break;
1026 case htons(ETH_P_IPV6):
1027 ipip6_tunnel_xmit(skb, dev);
1028 break;
1029 #if IS_ENABLED(CONFIG_MPLS)
1030 case htons(ETH_P_MPLS_UC):
1031 sit_tunnel_xmit__(skb, dev, IPPROTO_MPLS);
1032 break;
1033 #endif
1034 default:
1035 goto tx_err;
1036 }
1037
1038 return NETDEV_TX_OK;
1039
1040 tx_err:
1041 dev->stats.tx_errors++;
1042 kfree_skb(skb);
1043 return NETDEV_TX_OK;
1044
1045 }
1046
1047 static void ipip6_tunnel_bind_dev(struct net_device *dev)
1048 {
1049 struct net_device *tdev = NULL;
1050 struct ip_tunnel *tunnel;
1051 const struct iphdr *iph;
1052 struct flowi4 fl4;
1053
1054 tunnel = netdev_priv(dev);
1055 iph = &tunnel->parms.iph;
1056
1057 if (iph->daddr) {
1058 struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4,
1059 NULL,
1060 iph->daddr, iph->saddr,
1061 0, 0,
1062 IPPROTO_IPV6,
1063 RT_TOS(iph->tos),
1064 tunnel->parms.link);
1065
1066 if (!IS_ERR(rt)) {
1067 tdev = rt->dst.dev;
1068 ip_rt_put(rt);
1069 }
1070 dev->flags |= IFF_POINTOPOINT;
1071 }
1072
1073 if (!tdev && tunnel->parms.link)
1074 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link);
1075
1076 if (tdev) {
1077 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
1078
1079 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
1080 dev->mtu = tdev->mtu - t_hlen;
1081 if (dev->mtu < IPV6_MIN_MTU)
1082 dev->mtu = IPV6_MIN_MTU;
1083 }
1084 }
1085
1086 static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p,
1087 __u32 fwmark)
1088 {
1089 struct net *net = t->net;
1090 struct sit_net *sitn = net_generic(net, sit_net_id);
1091
1092 ipip6_tunnel_unlink(sitn, t);
1093 synchronize_net();
1094 t->parms.iph.saddr = p->iph.saddr;
1095 t->parms.iph.daddr = p->iph.daddr;
1096 memcpy(t->dev->dev_addr, &p->iph.saddr, 4);
1097 memcpy(t->dev->broadcast, &p->iph.daddr, 4);
1098 ipip6_tunnel_link(sitn, t);
1099 t->parms.iph.ttl = p->iph.ttl;
1100 t->parms.iph.tos = p->iph.tos;
1101 if (t->parms.link != p->link || t->fwmark != fwmark) {
1102 t->parms.link = p->link;
1103 t->fwmark = fwmark;
1104 ipip6_tunnel_bind_dev(t->dev);
1105 }
1106 dst_cache_reset(&t->dst_cache);
1107 netdev_state_change(t->dev);
1108 }
1109
1110 #ifdef CONFIG_IPV6_SIT_6RD
1111 static int ipip6_tunnel_update_6rd(struct ip_tunnel *t,
1112 struct ip_tunnel_6rd *ip6rd)
1113 {
1114 struct in6_addr prefix;
1115 __be32 relay_prefix;
1116
1117 if (ip6rd->relay_prefixlen > 32 ||
1118 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64)
1119 return -EINVAL;
1120
1121 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen);
1122 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix))
1123 return -EINVAL;
1124 if (ip6rd->relay_prefixlen)
1125 relay_prefix = ip6rd->relay_prefix &
1126 htonl(0xffffffffUL <<
1127 (32 - ip6rd->relay_prefixlen));
1128 else
1129 relay_prefix = 0;
1130 if (relay_prefix != ip6rd->relay_prefix)
1131 return -EINVAL;
1132
1133 t->ip6rd.prefix = prefix;
1134 t->ip6rd.relay_prefix = relay_prefix;
1135 t->ip6rd.prefixlen = ip6rd->prefixlen;
1136 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen;
1137 dst_cache_reset(&t->dst_cache);
1138 netdev_state_change(t->dev);
1139 return 0;
1140 }
1141 #endif
1142
1143 static bool ipip6_valid_ip_proto(u8 ipproto)
1144 {
1145 return ipproto == IPPROTO_IPV6 ||
1146 ipproto == IPPROTO_IPIP ||
1147 #if IS_ENABLED(CONFIG_MPLS)
1148 ipproto == IPPROTO_MPLS ||
1149 #endif
1150 ipproto == 0;
1151 }
1152
1153 static int
1154 ipip6_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1155 {
1156 int err = 0;
1157 struct ip_tunnel_parm p;
1158 struct ip_tunnel_prl prl;
1159 struct ip_tunnel *t = netdev_priv(dev);
1160 struct net *net = t->net;
1161 struct sit_net *sitn = net_generic(net, sit_net_id);
1162 #ifdef CONFIG_IPV6_SIT_6RD
1163 struct ip_tunnel_6rd ip6rd;
1164 #endif
1165
1166 switch (cmd) {
1167 case SIOCGETTUNNEL:
1168 #ifdef CONFIG_IPV6_SIT_6RD
1169 case SIOCGET6RD:
1170 #endif
1171 if (dev == sitn->fb_tunnel_dev) {
1172 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1173 err = -EFAULT;
1174 break;
1175 }
1176 t = ipip6_tunnel_locate(net, &p, 0);
1177 if (!t)
1178 t = netdev_priv(dev);
1179 }
1180
1181 err = -EFAULT;
1182 if (cmd == SIOCGETTUNNEL) {
1183 memcpy(&p, &t->parms, sizeof(p));
1184 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p,
1185 sizeof(p)))
1186 goto done;
1187 #ifdef CONFIG_IPV6_SIT_6RD
1188 } else {
1189 ip6rd.prefix = t->ip6rd.prefix;
1190 ip6rd.relay_prefix = t->ip6rd.relay_prefix;
1191 ip6rd.prefixlen = t->ip6rd.prefixlen;
1192 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;
1193 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd,
1194 sizeof(ip6rd)))
1195 goto done;
1196 #endif
1197 }
1198 err = 0;
1199 break;
1200
1201 case SIOCADDTUNNEL:
1202 case SIOCCHGTUNNEL:
1203 err = -EPERM;
1204 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1205 goto done;
1206
1207 err = -EFAULT;
1208 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1209 goto done;
1210
1211 err = -EINVAL;
1212 if (!ipip6_valid_ip_proto(p.iph.protocol))
1213 goto done;
1214 if (p.iph.version != 4 ||
1215 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
1216 goto done;
1217 if (p.iph.ttl)
1218 p.iph.frag_off |= htons(IP_DF);
1219
1220 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
1221
1222 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1223 if (t) {
1224 if (t->dev != dev) {
1225 err = -EEXIST;
1226 break;
1227 }
1228 } else {
1229 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
1230 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
1231 err = -EINVAL;
1232 break;
1233 }
1234 t = netdev_priv(dev);
1235 }
1236
1237 ipip6_tunnel_update(t, &p, t->fwmark);
1238 }
1239
1240 if (t) {
1241 err = 0;
1242 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
1243 err = -EFAULT;
1244 } else
1245 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1246 break;
1247
1248 case SIOCDELTUNNEL:
1249 err = -EPERM;
1250 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1251 goto done;
1252
1253 if (dev == sitn->fb_tunnel_dev) {
1254 err = -EFAULT;
1255 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1256 goto done;
1257 err = -ENOENT;
1258 t = ipip6_tunnel_locate(net, &p, 0);
1259 if (!t)
1260 goto done;
1261 err = -EPERM;
1262 if (t == netdev_priv(sitn->fb_tunnel_dev))
1263 goto done;
1264 dev = t->dev;
1265 }
1266 unregister_netdevice(dev);
1267 err = 0;
1268 break;
1269
1270 case SIOCGETPRL:
1271 err = -EINVAL;
1272 if (dev == sitn->fb_tunnel_dev)
1273 goto done;
1274 err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data);
1275 break;
1276
1277 case SIOCADDPRL:
1278 case SIOCDELPRL:
1279 case SIOCCHGPRL:
1280 err = -EPERM;
1281 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1282 goto done;
1283 err = -EINVAL;
1284 if (dev == sitn->fb_tunnel_dev)
1285 goto done;
1286 err = -EFAULT;
1287 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
1288 goto done;
1289
1290 switch (cmd) {
1291 case SIOCDELPRL:
1292 err = ipip6_tunnel_del_prl(t, &prl);
1293 break;
1294 case SIOCADDPRL:
1295 case SIOCCHGPRL:
1296 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
1297 break;
1298 }
1299 dst_cache_reset(&t->dst_cache);
1300 netdev_state_change(dev);
1301 break;
1302
1303 #ifdef CONFIG_IPV6_SIT_6RD
1304 case SIOCADD6RD:
1305 case SIOCCHG6RD:
1306 case SIOCDEL6RD:
1307 err = -EPERM;
1308 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1309 goto done;
1310
1311 err = -EFAULT;
1312 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data,
1313 sizeof(ip6rd)))
1314 goto done;
1315
1316 if (cmd != SIOCDEL6RD) {
1317 err = ipip6_tunnel_update_6rd(t, &ip6rd);
1318 if (err < 0)
1319 goto done;
1320 } else
1321 ipip6_tunnel_clone_6rd(dev, sitn);
1322
1323 err = 0;
1324 break;
1325 #endif
1326
1327 default:
1328 err = -EINVAL;
1329 }
1330
1331 done:
1332 return err;
1333 }
1334
1335 static const struct net_device_ops ipip6_netdev_ops = {
1336 .ndo_init = ipip6_tunnel_init,
1337 .ndo_uninit = ipip6_tunnel_uninit,
1338 .ndo_start_xmit = sit_tunnel_xmit,
1339 .ndo_do_ioctl = ipip6_tunnel_ioctl,
1340 .ndo_get_stats64 = ip_tunnel_get_stats64,
1341 .ndo_get_iflink = ip_tunnel_get_iflink,
1342 };
1343
1344 static void ipip6_dev_free(struct net_device *dev)
1345 {
1346 struct ip_tunnel *tunnel = netdev_priv(dev);
1347
1348 dst_cache_destroy(&tunnel->dst_cache);
1349 free_percpu(dev->tstats);
1350 }
1351
1352 #define SIT_FEATURES (NETIF_F_SG | \
1353 NETIF_F_FRAGLIST | \
1354 NETIF_F_HIGHDMA | \
1355 NETIF_F_GSO_SOFTWARE | \
1356 NETIF_F_HW_CSUM)
1357
1358 static void ipip6_tunnel_setup(struct net_device *dev)
1359 {
1360 struct ip_tunnel *tunnel = netdev_priv(dev);
1361 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
1362
1363 dev->netdev_ops = &ipip6_netdev_ops;
1364 dev->needs_free_netdev = true;
1365 dev->priv_destructor = ipip6_dev_free;
1366
1367 dev->type = ARPHRD_SIT;
1368 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1369 dev->mtu = ETH_DATA_LEN - t_hlen;
1370 dev->min_mtu = IPV6_MIN_MTU;
1371 dev->max_mtu = 0xFFF8 - t_hlen;
1372 dev->flags = IFF_NOARP;
1373 netif_keep_dst(dev);
1374 dev->addr_len = 4;
1375 dev->features |= NETIF_F_LLTX;
1376 dev->features |= SIT_FEATURES;
1377 dev->hw_features |= SIT_FEATURES;
1378 }
1379
1380 static int ipip6_tunnel_init(struct net_device *dev)
1381 {
1382 struct ip_tunnel *tunnel = netdev_priv(dev);
1383 int err;
1384
1385 tunnel->dev = dev;
1386 tunnel->net = dev_net(dev);
1387 strcpy(tunnel->parms.name, dev->name);
1388
1389 ipip6_tunnel_bind_dev(dev);
1390 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1391 if (!dev->tstats)
1392 return -ENOMEM;
1393
1394 err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1395 if (err) {
1396 free_percpu(dev->tstats);
1397 dev->tstats = NULL;
1398 return err;
1399 }
1400
1401 return 0;
1402 }
1403
1404 static void __net_init ipip6_fb_tunnel_init(struct net_device *dev)
1405 {
1406 struct ip_tunnel *tunnel = netdev_priv(dev);
1407 struct iphdr *iph = &tunnel->parms.iph;
1408 struct net *net = dev_net(dev);
1409 struct sit_net *sitn = net_generic(net, sit_net_id);
1410
1411 iph->version = 4;
1412 iph->protocol = IPPROTO_IPV6;
1413 iph->ihl = 5;
1414 iph->ttl = 64;
1415
1416 dev_hold(dev);
1417 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel);
1418 }
1419
1420 static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[],
1421 struct netlink_ext_ack *extack)
1422 {
1423 u8 proto;
1424
1425 if (!data || !data[IFLA_IPTUN_PROTO])
1426 return 0;
1427
1428 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1429 if (!ipip6_valid_ip_proto(proto))
1430 return -EINVAL;
1431
1432 return 0;
1433 }
1434
1435 static void ipip6_netlink_parms(struct nlattr *data[],
1436 struct ip_tunnel_parm *parms,
1437 __u32 *fwmark)
1438 {
1439 memset(parms, 0, sizeof(*parms));
1440
1441 parms->iph.version = 4;
1442 parms->iph.protocol = IPPROTO_IPV6;
1443 parms->iph.ihl = 5;
1444 parms->iph.ttl = 64;
1445
1446 if (!data)
1447 return;
1448
1449 if (data[IFLA_IPTUN_LINK])
1450 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1451
1452 if (data[IFLA_IPTUN_LOCAL])
1453 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]);
1454
1455 if (data[IFLA_IPTUN_REMOTE])
1456 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]);
1457
1458 if (data[IFLA_IPTUN_TTL]) {
1459 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
1460 if (parms->iph.ttl)
1461 parms->iph.frag_off = htons(IP_DF);
1462 }
1463
1464 if (data[IFLA_IPTUN_TOS])
1465 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
1466
1467 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
1468 parms->iph.frag_off = htons(IP_DF);
1469
1470 if (data[IFLA_IPTUN_FLAGS])
1471 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]);
1472
1473 if (data[IFLA_IPTUN_PROTO])
1474 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1475
1476 if (data[IFLA_IPTUN_FWMARK])
1477 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
1478 }
1479
1480 /* This function returns true when ENCAP attributes are present in the nl msg */
1481 static bool ipip6_netlink_encap_parms(struct nlattr *data[],
1482 struct ip_tunnel_encap *ipencap)
1483 {
1484 bool ret = false;
1485
1486 memset(ipencap, 0, sizeof(*ipencap));
1487
1488 if (!data)
1489 return ret;
1490
1491 if (data[IFLA_IPTUN_ENCAP_TYPE]) {
1492 ret = true;
1493 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
1494 }
1495
1496 if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
1497 ret = true;
1498 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
1499 }
1500
1501 if (data[IFLA_IPTUN_ENCAP_SPORT]) {
1502 ret = true;
1503 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
1504 }
1505
1506 if (data[IFLA_IPTUN_ENCAP_DPORT]) {
1507 ret = true;
1508 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
1509 }
1510
1511 return ret;
1512 }
1513
1514 #ifdef CONFIG_IPV6_SIT_6RD
1515 /* This function returns true when 6RD attributes are present in the nl msg */
1516 static bool ipip6_netlink_6rd_parms(struct nlattr *data[],
1517 struct ip_tunnel_6rd *ip6rd)
1518 {
1519 bool ret = false;
1520 memset(ip6rd, 0, sizeof(*ip6rd));
1521
1522 if (!data)
1523 return ret;
1524
1525 if (data[IFLA_IPTUN_6RD_PREFIX]) {
1526 ret = true;
1527 ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]);
1528 }
1529
1530 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) {
1531 ret = true;
1532 ip6rd->relay_prefix =
1533 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]);
1534 }
1535
1536 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) {
1537 ret = true;
1538 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]);
1539 }
1540
1541 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) {
1542 ret = true;
1543 ip6rd->relay_prefixlen =
1544 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
1545 }
1546
1547 return ret;
1548 }
1549 #endif
1550
1551 static int ipip6_newlink(struct net *src_net, struct net_device *dev,
1552 struct nlattr *tb[], struct nlattr *data[],
1553 struct netlink_ext_ack *extack)
1554 {
1555 struct net *net = dev_net(dev);
1556 struct ip_tunnel *nt;
1557 struct ip_tunnel_encap ipencap;
1558 #ifdef CONFIG_IPV6_SIT_6RD
1559 struct ip_tunnel_6rd ip6rd;
1560 #endif
1561 int err;
1562
1563 nt = netdev_priv(dev);
1564
1565 if (ipip6_netlink_encap_parms(data, &ipencap)) {
1566 err = ip_tunnel_encap_setup(nt, &ipencap);
1567 if (err < 0)
1568 return err;
1569 }
1570
1571 ipip6_netlink_parms(data, &nt->parms, &nt->fwmark);
1572
1573 if (ipip6_tunnel_locate(net, &nt->parms, 0))
1574 return -EEXIST;
1575
1576 err = ipip6_tunnel_create(dev);
1577 if (err < 0)
1578 return err;
1579
1580 #ifdef CONFIG_IPV6_SIT_6RD
1581 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1582 err = ipip6_tunnel_update_6rd(nt, &ip6rd);
1583 #endif
1584
1585 return err;
1586 }
1587
1588 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[],
1589 struct nlattr *data[],
1590 struct netlink_ext_ack *extack)
1591 {
1592 struct ip_tunnel *t = netdev_priv(dev);
1593 struct ip_tunnel_parm p;
1594 struct ip_tunnel_encap ipencap;
1595 struct net *net = t->net;
1596 struct sit_net *sitn = net_generic(net, sit_net_id);
1597 #ifdef CONFIG_IPV6_SIT_6RD
1598 struct ip_tunnel_6rd ip6rd;
1599 #endif
1600 __u32 fwmark = t->fwmark;
1601 int err;
1602
1603 if (dev == sitn->fb_tunnel_dev)
1604 return -EINVAL;
1605
1606 if (ipip6_netlink_encap_parms(data, &ipencap)) {
1607 err = ip_tunnel_encap_setup(t, &ipencap);
1608 if (err < 0)
1609 return err;
1610 }
1611
1612 ipip6_netlink_parms(data, &p, &fwmark);
1613
1614 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
1615 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
1616 return -EINVAL;
1617
1618 t = ipip6_tunnel_locate(net, &p, 0);
1619
1620 if (t) {
1621 if (t->dev != dev)
1622 return -EEXIST;
1623 } else
1624 t = netdev_priv(dev);
1625
1626 ipip6_tunnel_update(t, &p, fwmark);
1627
1628 #ifdef CONFIG_IPV6_SIT_6RD
1629 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1630 return ipip6_tunnel_update_6rd(t, &ip6rd);
1631 #endif
1632
1633 return 0;
1634 }
1635
1636 static size_t ipip6_get_size(const struct net_device *dev)
1637 {
1638 return
1639 /* IFLA_IPTUN_LINK */
1640 nla_total_size(4) +
1641 /* IFLA_IPTUN_LOCAL */
1642 nla_total_size(4) +
1643 /* IFLA_IPTUN_REMOTE */
1644 nla_total_size(4) +
1645 /* IFLA_IPTUN_TTL */
1646 nla_total_size(1) +
1647 /* IFLA_IPTUN_TOS */
1648 nla_total_size(1) +
1649 /* IFLA_IPTUN_PMTUDISC */
1650 nla_total_size(1) +
1651 /* IFLA_IPTUN_FLAGS */
1652 nla_total_size(2) +
1653 /* IFLA_IPTUN_PROTO */
1654 nla_total_size(1) +
1655 #ifdef CONFIG_IPV6_SIT_6RD
1656 /* IFLA_IPTUN_6RD_PREFIX */
1657 nla_total_size(sizeof(struct in6_addr)) +
1658 /* IFLA_IPTUN_6RD_RELAY_PREFIX */
1659 nla_total_size(4) +
1660 /* IFLA_IPTUN_6RD_PREFIXLEN */
1661 nla_total_size(2) +
1662 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */
1663 nla_total_size(2) +
1664 #endif
1665 /* IFLA_IPTUN_ENCAP_TYPE */
1666 nla_total_size(2) +
1667 /* IFLA_IPTUN_ENCAP_FLAGS */
1668 nla_total_size(2) +
1669 /* IFLA_IPTUN_ENCAP_SPORT */
1670 nla_total_size(2) +
1671 /* IFLA_IPTUN_ENCAP_DPORT */
1672 nla_total_size(2) +
1673 /* IFLA_IPTUN_FWMARK */
1674 nla_total_size(4) +
1675 0;
1676 }
1677
1678 static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1679 {
1680 struct ip_tunnel *tunnel = netdev_priv(dev);
1681 struct ip_tunnel_parm *parm = &tunnel->parms;
1682
1683 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
1684 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
1685 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
1686 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
1687 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
1688 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
1689 !!(parm->iph.frag_off & htons(IP_DF))) ||
1690 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
1691 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags) ||
1692 nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark))
1693 goto nla_put_failure;
1694
1695 #ifdef CONFIG_IPV6_SIT_6RD
1696 if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX,
1697 &tunnel->ip6rd.prefix) ||
1698 nla_put_in_addr(skb, IFLA_IPTUN_6RD_RELAY_PREFIX,
1699 tunnel->ip6rd.relay_prefix) ||
1700 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN,
1701 tunnel->ip6rd.prefixlen) ||
1702 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
1703 tunnel->ip6rd.relay_prefixlen))
1704 goto nla_put_failure;
1705 #endif
1706
1707 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE,
1708 tunnel->encap.type) ||
1709 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT,
1710 tunnel->encap.sport) ||
1711 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT,
1712 tunnel->encap.dport) ||
1713 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS,
1714 tunnel->encap.flags))
1715 goto nla_put_failure;
1716
1717 return 0;
1718
1719 nla_put_failure:
1720 return -EMSGSIZE;
1721 }
1722
1723 static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = {
1724 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1725 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 },
1726 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 },
1727 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1728 [IFLA_IPTUN_TOS] = { .type = NLA_U8 },
1729 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 },
1730 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 },
1731 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
1732 #ifdef CONFIG_IPV6_SIT_6RD
1733 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) },
1734 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 },
1735 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 },
1736 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 },
1737 #endif
1738 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
1739 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
1740 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
1741 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
1742 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
1743 };
1744
1745 static void ipip6_dellink(struct net_device *dev, struct list_head *head)
1746 {
1747 struct net *net = dev_net(dev);
1748 struct sit_net *sitn = net_generic(net, sit_net_id);
1749
1750 if (dev != sitn->fb_tunnel_dev)
1751 unregister_netdevice_queue(dev, head);
1752 }
1753
1754 static struct rtnl_link_ops sit_link_ops __read_mostly = {
1755 .kind = "sit",
1756 .maxtype = IFLA_IPTUN_MAX,
1757 .policy = ipip6_policy,
1758 .priv_size = sizeof(struct ip_tunnel),
1759 .setup = ipip6_tunnel_setup,
1760 .validate = ipip6_validate,
1761 .newlink = ipip6_newlink,
1762 .changelink = ipip6_changelink,
1763 .get_size = ipip6_get_size,
1764 .fill_info = ipip6_fill_info,
1765 .dellink = ipip6_dellink,
1766 .get_link_net = ip_tunnel_get_link_net,
1767 };
1768
1769 static struct xfrm_tunnel sit_handler __read_mostly = {
1770 .handler = ipip6_rcv,
1771 .err_handler = ipip6_err,
1772 .priority = 1,
1773 };
1774
1775 static struct xfrm_tunnel ipip_handler __read_mostly = {
1776 .handler = ipip_rcv,
1777 .err_handler = ipip6_err,
1778 .priority = 2,
1779 };
1780
1781 #if IS_ENABLED(CONFIG_MPLS)
1782 static struct xfrm_tunnel mplsip_handler __read_mostly = {
1783 .handler = mplsip_rcv,
1784 .err_handler = ipip6_err,
1785 .priority = 2,
1786 };
1787 #endif
1788
1789 static void __net_exit sit_destroy_tunnels(struct net *net,
1790 struct list_head *head)
1791 {
1792 struct sit_net *sitn = net_generic(net, sit_net_id);
1793 struct net_device *dev, *aux;
1794 int prio;
1795
1796 for_each_netdev_safe(net, dev, aux)
1797 if (dev->rtnl_link_ops == &sit_link_ops)
1798 unregister_netdevice_queue(dev, head);
1799
1800 for (prio = 1; prio < 4; prio++) {
1801 int h;
1802 for (h = 0; h < IP6_SIT_HASH_SIZE; h++) {
1803 struct ip_tunnel *t;
1804
1805 t = rtnl_dereference(sitn->tunnels[prio][h]);
1806 while (t) {
1807 /* If dev is in the same netns, it has already
1808 * been added to the list by the previous loop.
1809 */
1810 if (!net_eq(dev_net(t->dev), net))
1811 unregister_netdevice_queue(t->dev,
1812 head);
1813 t = rtnl_dereference(t->next);
1814 }
1815 }
1816 }
1817 }
1818
1819 static int __net_init sit_init_net(struct net *net)
1820 {
1821 struct sit_net *sitn = net_generic(net, sit_net_id);
1822 struct ip_tunnel *t;
1823 int err;
1824
1825 sitn->tunnels[0] = sitn->tunnels_wc;
1826 sitn->tunnels[1] = sitn->tunnels_l;
1827 sitn->tunnels[2] = sitn->tunnels_r;
1828 sitn->tunnels[3] = sitn->tunnels_r_l;
1829
1830 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
1831 NET_NAME_UNKNOWN,
1832 ipip6_tunnel_setup);
1833 if (!sitn->fb_tunnel_dev) {
1834 err = -ENOMEM;
1835 goto err_alloc_dev;
1836 }
1837 dev_net_set(sitn->fb_tunnel_dev, net);
1838 sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops;
1839 /* FB netdevice is special: we have one, and only one per netns.
1840 * Allowing to move it to another netns is clearly unsafe.
1841 */
1842 sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1843
1844 err = register_netdev(sitn->fb_tunnel_dev);
1845 if (err)
1846 goto err_reg_dev;
1847
1848 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
1849 ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
1850
1851 t = netdev_priv(sitn->fb_tunnel_dev);
1852
1853 strcpy(t->parms.name, sitn->fb_tunnel_dev->name);
1854 return 0;
1855
1856 err_reg_dev:
1857 ipip6_dev_free(sitn->fb_tunnel_dev);
1858 err_alloc_dev:
1859 return err;
1860 }
1861
1862 static void __net_exit sit_exit_batch_net(struct list_head *net_list)
1863 {
1864 LIST_HEAD(list);
1865 struct net *net;
1866
1867 rtnl_lock();
1868 list_for_each_entry(net, net_list, exit_list)
1869 sit_destroy_tunnels(net, &list);
1870
1871 unregister_netdevice_many(&list);
1872 rtnl_unlock();
1873 }
1874
1875 static struct pernet_operations sit_net_ops = {
1876 .init = sit_init_net,
1877 .exit_batch = sit_exit_batch_net,
1878 .id = &sit_net_id,
1879 .size = sizeof(struct sit_net),
1880 };
1881
1882 static void __exit sit_cleanup(void)
1883 {
1884 rtnl_link_unregister(&sit_link_ops);
1885 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1886 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
1887 #if IS_ENABLED(CONFIG_MPLS)
1888 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS);
1889 #endif
1890
1891 unregister_pernet_device(&sit_net_ops);
1892 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1893 }
1894
1895 static int __init sit_init(void)
1896 {
1897 int err;
1898
1899 pr_info("IPv6, IPv4 and MPLS over IPv4 tunneling driver\n");
1900
1901 err = register_pernet_device(&sit_net_ops);
1902 if (err < 0)
1903 return err;
1904 err = xfrm4_tunnel_register(&sit_handler, AF_INET6);
1905 if (err < 0) {
1906 pr_info("%s: can't register ip6ip4\n", __func__);
1907 goto xfrm_tunnel_failed;
1908 }
1909 err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
1910 if (err < 0) {
1911 pr_info("%s: can't register ip4ip4\n", __func__);
1912 goto xfrm_tunnel4_failed;
1913 }
1914 #if IS_ENABLED(CONFIG_MPLS)
1915 err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS);
1916 if (err < 0) {
1917 pr_info("%s: can't register mplsip\n", __func__);
1918 goto xfrm_tunnel_mpls_failed;
1919 }
1920 #endif
1921 err = rtnl_link_register(&sit_link_ops);
1922 if (err < 0)
1923 goto rtnl_link_failed;
1924
1925 out:
1926 return err;
1927
1928 rtnl_link_failed:
1929 #if IS_ENABLED(CONFIG_MPLS)
1930 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS);
1931 xfrm_tunnel_mpls_failed:
1932 #endif
1933 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
1934 xfrm_tunnel4_failed:
1935 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1936 xfrm_tunnel_failed:
1937 unregister_pernet_device(&sit_net_ops);
1938 goto out;
1939 }
1940
1941 module_init(sit_init);
1942 module_exit(sit_cleanup);
1943 MODULE_LICENSE("GPL");
1944 MODULE_ALIAS_RTNL_LINK("sit");
1945 MODULE_ALIAS_NETDEV("sit0");
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