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Merge tag 'iommu-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
[linux/fpc-iii.git] / net / ipv6 / sit.c
blob2da0ee70377959b1c87e23fae244ac79195ad997
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT)
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
9 *
10 * Changes:
11 * Roger Venning <r.venning@telstra.com>: 6to4 support
12 * Nate Thompson <nate@thebog.net>: 6to4 support
13 * Fred Templin <fred.l.templin@boeing.com>: isatap support
14 */
15
16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
17
18 #include <linux/module.h>
19 #include <linux/capability.h>
20 #include <linux/errno.h>
21 #include <linux/types.h>
22 #include <linux/socket.h>
23 #include <linux/sockios.h>
24 #include <linux/net.h>
25 #include <linux/in6.h>
26 #include <linux/netdevice.h>
27 #include <linux/if_arp.h>
28 #include <linux/icmp.h>
29 #include <linux/slab.h>
30 #include <linux/uaccess.h>
31 #include <linux/init.h>
32 #include <linux/netfilter_ipv4.h>
33 #include <linux/if_ether.h>
34
35 #include <net/sock.h>
36 #include <net/snmp.h>
37
38 #include <net/ipv6.h>
39 #include <net/protocol.h>
40 #include <net/transp_v6.h>
41 #include <net/ip6_fib.h>
42 #include <net/ip6_route.h>
43 #include <net/ndisc.h>
44 #include <net/addrconf.h>
45 #include <net/ip.h>
46 #include <net/udp.h>
47 #include <net/icmp.h>
48 #include <net/ip_tunnels.h>
49 #include <net/inet_ecn.h>
50 #include <net/xfrm.h>
51 #include <net/dsfield.h>
52 #include <net/net_namespace.h>
53 #include <net/netns/generic.h>
54
55 /*
56 This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c
57
58 For comments look at net/ipv4/ip_gre.c --ANK
59 */
60
61 #define IP6_SIT_HASH_SIZE 16
62 #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
63
64 static bool log_ecn_error = true;
65 module_param(log_ecn_error, bool, 0644);
66 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
67
68 static int ipip6_tunnel_init(struct net_device *dev);
69 static void ipip6_tunnel_setup(struct net_device *dev);
70 static void ipip6_dev_free(struct net_device *dev);
71 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
72 __be32 *v4dst);
73 static struct rtnl_link_ops sit_link_ops __read_mostly;
74
75 static unsigned int sit_net_id __read_mostly;
76 struct sit_net {
77 struct ip_tunnel __rcu *tunnels_r_l[IP6_SIT_HASH_SIZE];
78 struct ip_tunnel __rcu *tunnels_r[IP6_SIT_HASH_SIZE];
79 struct ip_tunnel __rcu *tunnels_l[IP6_SIT_HASH_SIZE];
80 struct ip_tunnel __rcu *tunnels_wc[1];
81 struct ip_tunnel __rcu **tunnels[4];
82
83 struct net_device *fb_tunnel_dev;
84 };
85
86 static inline struct sit_net *dev_to_sit_net(struct net_device *dev)
87 {
88 struct ip_tunnel *t = netdev_priv(dev);
89
90 return net_generic(t->net, sit_net_id);
91 }
92
93 /*
94 * Must be invoked with rcu_read_lock
95 */
96 static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net,
97 struct net_device *dev,
98 __be32 remote, __be32 local,
99 int sifindex)
100 {
101 unsigned int h0 = HASH(remote);
102 unsigned int h1 = HASH(local);
103 struct ip_tunnel *t;
104 struct sit_net *sitn = net_generic(net, sit_net_id);
105 int ifindex = dev ? dev->ifindex : 0;
106
107 for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) {
108 if (local == t->parms.iph.saddr &&
109 remote == t->parms.iph.daddr &&
110 (!dev || !t->parms.link || ifindex == t->parms.link ||
111 sifindex == t->parms.link) &&
112 (t->dev->flags & IFF_UP))
113 return t;
114 }
115 for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) {
116 if (remote == t->parms.iph.daddr &&
117 (!dev || !t->parms.link || ifindex == t->parms.link ||
118 sifindex == t->parms.link) &&
119 (t->dev->flags & IFF_UP))
120 return t;
121 }
122 for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) {
123 if (local == t->parms.iph.saddr &&
124 (!dev || !t->parms.link || ifindex == t->parms.link ||
125 sifindex == t->parms.link) &&
126 (t->dev->flags & IFF_UP))
127 return t;
128 }
129 t = rcu_dereference(sitn->tunnels_wc[0]);
130 if (t && (t->dev->flags & IFF_UP))
131 return t;
132 return NULL;
133 }
134
135 static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn,
136 struct ip_tunnel_parm *parms)
137 {
138 __be32 remote = parms->iph.daddr;
139 __be32 local = parms->iph.saddr;
140 unsigned int h = 0;
141 int prio = 0;
142
143 if (remote) {
144 prio |= 2;
145 h ^= HASH(remote);
146 }
147 if (local) {
148 prio |= 1;
149 h ^= HASH(local);
150 }
151 return &sitn->tunnels[prio][h];
152 }
153
154 static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn,
155 struct ip_tunnel *t)
156 {
157 return __ipip6_bucket(sitn, &t->parms);
158 }
159
160 static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t)
161 {
162 struct ip_tunnel __rcu **tp;
163 struct ip_tunnel *iter;
164
165 for (tp = ipip6_bucket(sitn, t);
166 (iter = rtnl_dereference(*tp)) != NULL;
167 tp = &iter->next) {
168 if (t == iter) {
169 rcu_assign_pointer(*tp, t->next);
170 break;
171 }
172 }
173 }
174
175 static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t)
176 {
177 struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t);
178
179 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
180 rcu_assign_pointer(*tp, t);
181 }
182
183 static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn)
184 {
185 #ifdef CONFIG_IPV6_SIT_6RD
186 struct ip_tunnel *t = netdev_priv(dev);
187
188 if (dev == sitn->fb_tunnel_dev || !sitn->fb_tunnel_dev) {
189 ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0);
190 t->ip6rd.relay_prefix = 0;
191 t->ip6rd.prefixlen = 16;
192 t->ip6rd.relay_prefixlen = 0;
193 } else {
194 struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev);
195 memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd));
196 }
197 #endif
198 }
199
200 static int ipip6_tunnel_create(struct net_device *dev)
201 {
202 struct ip_tunnel *t = netdev_priv(dev);
203 struct net *net = dev_net(dev);
204 struct sit_net *sitn = net_generic(net, sit_net_id);
205 int err;
206
207 memcpy(dev->dev_addr, &t->parms.iph.saddr, 4);
208 memcpy(dev->broadcast, &t->parms.iph.daddr, 4);
209
210 if ((__force u16)t->parms.i_flags & SIT_ISATAP)
211 dev->priv_flags |= IFF_ISATAP;
212
213 dev->rtnl_link_ops = &sit_link_ops;
214
215 err = register_netdevice(dev);
216 if (err < 0)
217 goto out;
218
219 ipip6_tunnel_clone_6rd(dev, sitn);
220
221 dev_hold(dev);
222
223 ipip6_tunnel_link(sitn, t);
224 return 0;
225
226 out:
227 return err;
228 }
229
230 static struct ip_tunnel *ipip6_tunnel_locate(struct net *net,
231 struct ip_tunnel_parm *parms, int create)
232 {
233 __be32 remote = parms->iph.daddr;
234 __be32 local = parms->iph.saddr;
235 struct ip_tunnel *t, *nt;
236 struct ip_tunnel __rcu **tp;
237 struct net_device *dev;
238 char name[IFNAMSIZ];
239 struct sit_net *sitn = net_generic(net, sit_net_id);
240
241 for (tp = __ipip6_bucket(sitn, parms);
242 (t = rtnl_dereference(*tp)) != NULL;
243 tp = &t->next) {
244 if (local == t->parms.iph.saddr &&
245 remote == t->parms.iph.daddr &&
246 parms->link == t->parms.link) {
247 if (create)
248 return NULL;
249 else
250 return t;
251 }
252 }
253 if (!create)
254 goto failed;
255
256 if (parms->name[0]) {
257 if (!dev_valid_name(parms->name))
258 goto failed;
259 strlcpy(name, parms->name, IFNAMSIZ);
260 } else {
261 strcpy(name, "sit%d");
262 }
263 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
264 ipip6_tunnel_setup);
265 if (!dev)
266 return NULL;
267
268 dev_net_set(dev, net);
269
270 nt = netdev_priv(dev);
271
272 nt->parms = *parms;
273 if (ipip6_tunnel_create(dev) < 0)
274 goto failed_free;
275
276 return nt;
277
278 failed_free:
279 free_netdev(dev);
280 failed:
281 return NULL;
282 }
283
284 #define for_each_prl_rcu(start) \
285 for (prl = rcu_dereference(start); \
286 prl; \
287 prl = rcu_dereference(prl->next))
288
289 static struct ip_tunnel_prl_entry *
290 __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
291 {
292 struct ip_tunnel_prl_entry *prl;
293
294 for_each_prl_rcu(t->prl)
295 if (prl->addr == addr)
296 break;
297 return prl;
298
299 }
300
301 static int ipip6_tunnel_get_prl(struct net_device *dev, struct ifreq *ifr)
302 {
303 struct ip_tunnel_prl __user *a = ifr->ifr_ifru.ifru_data;
304 struct ip_tunnel *t = netdev_priv(dev);
305 struct ip_tunnel_prl kprl, *kp;
306 struct ip_tunnel_prl_entry *prl;
307 unsigned int cmax, c = 0, ca, len;
308 int ret = 0;
309
310 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev)
311 return -EINVAL;
312
313 if (copy_from_user(&kprl, a, sizeof(kprl)))
314 return -EFAULT;
315 cmax = kprl.datalen / sizeof(kprl);
316 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY))
317 cmax = 1;
318
319 /* For simple GET or for root users,
320 * we try harder to allocate.
321 */
322 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
323 kcalloc(cmax, sizeof(*kp), GFP_KERNEL | __GFP_NOWARN) :
324 NULL;
325
326 rcu_read_lock();
327
328 ca = t->prl_count < cmax ? t->prl_count : cmax;
329
330 if (!kp) {
331 /* We don't try hard to allocate much memory for
332 * non-root users.
333 * For root users, retry allocating enough memory for
334 * the answer.
335 */
336 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC);
337 if (!kp) {
338 ret = -ENOMEM;
339 goto out;
340 }
341 }
342
343 c = 0;
344 for_each_prl_rcu(t->prl) {
345 if (c >= cmax)
346 break;
347 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr)
348 continue;
349 kp[c].addr = prl->addr;
350 kp[c].flags = prl->flags;
351 c++;
352 if (kprl.addr != htonl(INADDR_ANY))
353 break;
354 }
355 out:
356 rcu_read_unlock();
357
358 len = sizeof(*kp) * c;
359 ret = 0;
360 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen))
361 ret = -EFAULT;
362
363 kfree(kp);
364
365 return ret;
366 }
367
368 static int
369 ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
370 {
371 struct ip_tunnel_prl_entry *p;
372 int err = 0;
373
374 if (a->addr == htonl(INADDR_ANY))
375 return -EINVAL;
376
377 ASSERT_RTNL();
378
379 for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) {
380 if (p->addr == a->addr) {
381 if (chg) {
382 p->flags = a->flags;
383 goto out;
384 }
385 err = -EEXIST;
386 goto out;
387 }
388 }
389
390 if (chg) {
391 err = -ENXIO;
392 goto out;
393 }
394
395 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
396 if (!p) {
397 err = -ENOBUFS;
398 goto out;
399 }
400
401 p->next = t->prl;
402 p->addr = a->addr;
403 p->flags = a->flags;
404 t->prl_count++;
405 rcu_assign_pointer(t->prl, p);
406 out:
407 return err;
408 }
409
410 static void prl_list_destroy_rcu(struct rcu_head *head)
411 {
412 struct ip_tunnel_prl_entry *p, *n;
413
414 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head);
415 do {
416 n = rcu_dereference_protected(p->next, 1);
417 kfree(p);
418 p = n;
419 } while (p);
420 }
421
422 static int
423 ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
424 {
425 struct ip_tunnel_prl_entry *x;
426 struct ip_tunnel_prl_entry __rcu **p;
427 int err = 0;
428
429 ASSERT_RTNL();
430
431 if (a && a->addr != htonl(INADDR_ANY)) {
432 for (p = &t->prl;
433 (x = rtnl_dereference(*p)) != NULL;
434 p = &x->next) {
435 if (x->addr == a->addr) {
436 *p = x->next;
437 kfree_rcu(x, rcu_head);
438 t->prl_count--;
439 goto out;
440 }
441 }
442 err = -ENXIO;
443 } else {
444 x = rtnl_dereference(t->prl);
445 if (x) {
446 t->prl_count = 0;
447 call_rcu(&x->rcu_head, prl_list_destroy_rcu);
448 t->prl = NULL;
449 }
450 }
451 out:
452 return err;
453 }
454
455 static int ipip6_tunnel_prl_ctl(struct net_device *dev, struct ifreq *ifr,
456 int cmd)
457 {
458 struct ip_tunnel *t = netdev_priv(dev);
459 struct ip_tunnel_prl prl;
460 int err;
461
462 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN))
463 return -EPERM;
464 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev)
465 return -EINVAL;
466
467 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
468 return -EFAULT;
469
470 switch (cmd) {
471 case SIOCDELPRL:
472 err = ipip6_tunnel_del_prl(t, &prl);
473 break;
474 case SIOCADDPRL:
475 case SIOCCHGPRL:
476 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
477 break;
478 }
479 dst_cache_reset(&t->dst_cache);
480 netdev_state_change(dev);
481 return err;
482 }
483
484 static int
485 isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t)
486 {
487 struct ip_tunnel_prl_entry *p;
488 int ok = 1;
489
490 rcu_read_lock();
491 p = __ipip6_tunnel_locate_prl(t, iph->saddr);
492 if (p) {
493 if (p->flags & PRL_DEFAULT)
494 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
495 else
496 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
497 } else {
498 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
499
500 if (ipv6_addr_is_isatap(addr6) &&
501 (addr6->s6_addr32[3] == iph->saddr) &&
502 ipv6_chk_prefix(addr6, t->dev))
503 skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
504 else
505 ok = 0;
506 }
507 rcu_read_unlock();
508 return ok;
509 }
510
511 static void ipip6_tunnel_uninit(struct net_device *dev)
512 {
513 struct ip_tunnel *tunnel = netdev_priv(dev);
514 struct sit_net *sitn = net_generic(tunnel->net, sit_net_id);
515
516 if (dev == sitn->fb_tunnel_dev) {
517 RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL);
518 } else {
519 ipip6_tunnel_unlink(sitn, tunnel);
520 ipip6_tunnel_del_prl(tunnel, NULL);
521 }
522 dst_cache_reset(&tunnel->dst_cache);
523 dev_put(dev);
524 }
525
526 static int ipip6_err(struct sk_buff *skb, u32 info)
527 {
528 const struct iphdr *iph = (const struct iphdr *)skb->data;
529 const int type = icmp_hdr(skb)->type;
530 const int code = icmp_hdr(skb)->code;
531 unsigned int data_len = 0;
532 struct ip_tunnel *t;
533 int sifindex;
534 int err;
535
536 switch (type) {
537 default:
538 case ICMP_PARAMETERPROB:
539 return 0;
540
541 case ICMP_DEST_UNREACH:
542 switch (code) {
543 case ICMP_SR_FAILED:
544 /* Impossible event. */
545 return 0;
546 default:
547 /* All others are translated to HOST_UNREACH.
548 rfc2003 contains "deep thoughts" about NET_UNREACH,
549 I believe they are just ether pollution. --ANK
550 */
551 break;
552 }
553 break;
554 case ICMP_TIME_EXCEEDED:
555 if (code != ICMP_EXC_TTL)
556 return 0;
557 data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */
558 break;
559 case ICMP_REDIRECT:
560 break;
561 }
562
563 err = -ENOENT;
564
565 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0;
566 t = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
567 iph->daddr, iph->saddr, sifindex);
568 if (!t)
569 goto out;
570
571 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
572 ipv4_update_pmtu(skb, dev_net(skb->dev), info,
573 t->parms.link, iph->protocol);
574 err = 0;
575 goto out;
576 }
577 if (type == ICMP_REDIRECT) {
578 ipv4_redirect(skb, dev_net(skb->dev), t->parms.link,
579 iph->protocol);
580 err = 0;
581 goto out;
582 }
583
584 err = 0;
585 if (__in6_dev_get(skb->dev) &&
586 !ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4, type, data_len))
587 goto out;
588
589 if (t->parms.iph.daddr == 0)
590 goto out;
591
592 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
593 goto out;
594
595 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
596 t->err_count++;
597 else
598 t->err_count = 1;
599 t->err_time = jiffies;
600 out:
601 return err;
602 }
603
604 static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr,
605 const struct in6_addr *v6addr)
606 {
607 __be32 v4embed = 0;
608 if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed)
609 return true;
610 return false;
611 }
612
613 /* Checks if an address matches an address on the tunnel interface.
614 * Used to detect the NAT of proto 41 packets and let them pass spoofing test.
615 * Long story:
616 * This function is called after we considered the packet as spoofed
617 * in is_spoofed_6rd.
618 * We may have a router that is doing NAT for proto 41 packets
619 * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb
620 * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd
621 * function will return true, dropping the packet.
622 * But, we can still check if is spoofed against the IP
623 * addresses associated with the interface.
624 */
625 static bool only_dnatted(const struct ip_tunnel *tunnel,
626 const struct in6_addr *v6dst)
627 {
628 int prefix_len;
629
630 #ifdef CONFIG_IPV6_SIT_6RD
631 prefix_len = tunnel->ip6rd.prefixlen + 32
632 - tunnel->ip6rd.relay_prefixlen;
633 #else
634 prefix_len = 48;
635 #endif
636 return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev);
637 }
638
639 /* Returns true if a packet is spoofed */
640 static bool packet_is_spoofed(struct sk_buff *skb,
641 const struct iphdr *iph,
642 struct ip_tunnel *tunnel)
643 {
644 const struct ipv6hdr *ipv6h;
645
646 if (tunnel->dev->priv_flags & IFF_ISATAP) {
647 if (!isatap_chksrc(skb, iph, tunnel))
648 return true;
649
650 return false;
651 }
652
653 if (tunnel->dev->flags & IFF_POINTOPOINT)
654 return false;
655
656 ipv6h = ipv6_hdr(skb);
657
658 if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) {
659 net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
660 &iph->saddr, &ipv6h->saddr,
661 &iph->daddr, &ipv6h->daddr);
662 return true;
663 }
664
665 if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr)))
666 return false;
667
668 if (only_dnatted(tunnel, &ipv6h->daddr))
669 return false;
670
671 net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
672 &iph->saddr, &ipv6h->saddr,
673 &iph->daddr, &ipv6h->daddr);
674 return true;
675 }
676
677 static int ipip6_rcv(struct sk_buff *skb)
678 {
679 const struct iphdr *iph = ip_hdr(skb);
680 struct ip_tunnel *tunnel;
681 int sifindex;
682 int err;
683
684 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0;
685 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
686 iph->saddr, iph->daddr, sifindex);
687 if (tunnel) {
688 struct pcpu_sw_netstats *tstats;
689
690 if (tunnel->parms.iph.protocol != IPPROTO_IPV6 &&
691 tunnel->parms.iph.protocol != 0)
692 goto out;
693
694 skb->mac_header = skb->network_header;
695 skb_reset_network_header(skb);
696 IPCB(skb)->flags = 0;
697 skb->dev = tunnel->dev;
698
699 if (packet_is_spoofed(skb, iph, tunnel)) {
700 tunnel->dev->stats.rx_errors++;
701 goto out;
702 }
703
704 if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6),
705 !net_eq(tunnel->net, dev_net(tunnel->dev))))
706 goto out;
707
708 /* skb can be uncloned in iptunnel_pull_header, so
709 * old iph is no longer valid
710 */
711 iph = (const struct iphdr *)skb_mac_header(skb);
712 err = IP_ECN_decapsulate(iph, skb);
713 if (unlikely(err)) {
714 if (log_ecn_error)
715 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
716 &iph->saddr, iph->tos);
717 if (err > 1) {
718 ++tunnel->dev->stats.rx_frame_errors;
719 ++tunnel->dev->stats.rx_errors;
720 goto out;
721 }
722 }
723
724 tstats = this_cpu_ptr(tunnel->dev->tstats);
725 u64_stats_update_begin(&tstats->syncp);
726 tstats->rx_packets++;
727 tstats->rx_bytes += skb->len;
728 u64_stats_update_end(&tstats->syncp);
729
730 netif_rx(skb);
731
732 return 0;
733 }
734
735 /* no tunnel matched, let upstream know, ipsec may handle it */
736 return 1;
737 out:
738 kfree_skb(skb);
739 return 0;
740 }
741
742 static const struct tnl_ptk_info ipip_tpi = {
743 /* no tunnel info required for ipip. */
744 .proto = htons(ETH_P_IP),
745 };
746
747 #if IS_ENABLED(CONFIG_MPLS)
748 static const struct tnl_ptk_info mplsip_tpi = {
749 /* no tunnel info required for mplsip. */
750 .proto = htons(ETH_P_MPLS_UC),
751 };
752 #endif
753
754 static int sit_tunnel_rcv(struct sk_buff *skb, u8 ipproto)
755 {
756 const struct iphdr *iph;
757 struct ip_tunnel *tunnel;
758 int sifindex;
759
760 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0;
761
762 iph = ip_hdr(skb);
763 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
764 iph->saddr, iph->daddr, sifindex);
765 if (tunnel) {
766 const struct tnl_ptk_info *tpi;
767
768 if (tunnel->parms.iph.protocol != ipproto &&
769 tunnel->parms.iph.protocol != 0)
770 goto drop;
771
772 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
773 goto drop;
774 #if IS_ENABLED(CONFIG_MPLS)
775 if (ipproto == IPPROTO_MPLS)
776 tpi = &mplsip_tpi;
777 else
778 #endif
779 tpi = &ipip_tpi;
780 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
781 goto drop;
782 return ip_tunnel_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
783 }
784
785 return 1;
786
787 drop:
788 kfree_skb(skb);
789 return 0;
790 }
791
792 static int ipip_rcv(struct sk_buff *skb)
793 {
794 return sit_tunnel_rcv(skb, IPPROTO_IPIP);
795 }
796
797 #if IS_ENABLED(CONFIG_MPLS)
798 static int mplsip_rcv(struct sk_buff *skb)
799 {
800 return sit_tunnel_rcv(skb, IPPROTO_MPLS);
801 }
802 #endif
803
804 /*
805 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function
806 * stores the embedded IPv4 address in v4dst and returns true.
807 */
808 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
809 __be32 *v4dst)
810 {
811 #ifdef CONFIG_IPV6_SIT_6RD
812 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix,
813 tunnel->ip6rd.prefixlen)) {
814 unsigned int pbw0, pbi0;
815 int pbi1;
816 u32 d;
817
818 pbw0 = tunnel->ip6rd.prefixlen >> 5;
819 pbi0 = tunnel->ip6rd.prefixlen & 0x1f;
820
821 d = tunnel->ip6rd.relay_prefixlen < 32 ?
822 (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
823 tunnel->ip6rd.relay_prefixlen : 0;
824
825 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;
826 if (pbi1 > 0)
827 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >>
828 (32 - pbi1);
829
830 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d);
831 return true;
832 }
833 #else
834 if (v6dst->s6_addr16[0] == htons(0x2002)) {
835 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
836 memcpy(v4dst, &v6dst->s6_addr16[1], 4);
837 return true;
838 }
839 #endif
840 return false;
841 }
842
843 static inline __be32 try_6rd(struct ip_tunnel *tunnel,
844 const struct in6_addr *v6dst)
845 {
846 __be32 dst = 0;
847 check_6rd(tunnel, v6dst, &dst);
848 return dst;
849 }
850
851 /*
852 * This function assumes it is being called from dev_queue_xmit()
853 * and that skb is filled properly by that function.
854 */
855
856 static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
857 struct net_device *dev)
858 {
859 struct ip_tunnel *tunnel = netdev_priv(dev);
860 const struct iphdr *tiph = &tunnel->parms.iph;
861 const struct ipv6hdr *iph6 = ipv6_hdr(skb);
862 u8 tos = tunnel->parms.iph.tos;
863 __be16 df = tiph->frag_off;
864 struct rtable *rt; /* Route to the other host */
865 struct net_device *tdev; /* Device to other host */
866 unsigned int max_headroom; /* The extra header space needed */
867 __be32 dst = tiph->daddr;
868 struct flowi4 fl4;
869 int mtu;
870 const struct in6_addr *addr6;
871 int addr_type;
872 u8 ttl;
873 u8 protocol = IPPROTO_IPV6;
874 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
875
876 if (tos == 1)
877 tos = ipv6_get_dsfield(iph6);
878
879 /* ISATAP (RFC4214) - must come before 6to4 */
880 if (dev->priv_flags & IFF_ISATAP) {
881 struct neighbour *neigh = NULL;
882 bool do_tx_error = false;
883
884 if (skb_dst(skb))
885 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
886
887 if (!neigh) {
888 net_dbg_ratelimited("nexthop == NULL\n");
889 goto tx_error;
890 }
891
892 addr6 = (const struct in6_addr *)&neigh->primary_key;
893 addr_type = ipv6_addr_type(addr6);
894
895 if ((addr_type & IPV6_ADDR_UNICAST) &&
896 ipv6_addr_is_isatap(addr6))
897 dst = addr6->s6_addr32[3];
898 else
899 do_tx_error = true;
900
901 neigh_release(neigh);
902 if (do_tx_error)
903 goto tx_error;
904 }
905
906 if (!dst)
907 dst = try_6rd(tunnel, &iph6->daddr);
908
909 if (!dst) {
910 struct neighbour *neigh = NULL;
911 bool do_tx_error = false;
912
913 if (skb_dst(skb))
914 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
915
916 if (!neigh) {
917 net_dbg_ratelimited("nexthop == NULL\n");
918 goto tx_error;
919 }
920
921 addr6 = (const struct in6_addr *)&neigh->primary_key;
922 addr_type = ipv6_addr_type(addr6);
923
924 if (addr_type == IPV6_ADDR_ANY) {
925 addr6 = &ipv6_hdr(skb)->daddr;
926 addr_type = ipv6_addr_type(addr6);
927 }
928
929 if ((addr_type & IPV6_ADDR_COMPATv4) != 0)
930 dst = addr6->s6_addr32[3];
931 else
932 do_tx_error = true;
933
934 neigh_release(neigh);
935 if (do_tx_error)
936 goto tx_error;
937 }
938
939 flowi4_init_output(&fl4, tunnel->parms.link, tunnel->fwmark,
940 RT_TOS(tos), RT_SCOPE_UNIVERSE, IPPROTO_IPV6,
941 0, dst, tiph->saddr, 0, 0,
942 sock_net_uid(tunnel->net, NULL));
943
944 rt = dst_cache_get_ip4(&tunnel->dst_cache, &fl4.saddr);
945 if (!rt) {
946 rt = ip_route_output_flow(tunnel->net, &fl4, NULL);
947 if (IS_ERR(rt)) {
948 dev->stats.tx_carrier_errors++;
949 goto tx_error_icmp;
950 }
951 dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst, fl4.saddr);
952 }
953
954 if (rt->rt_type != RTN_UNICAST) {
955 ip_rt_put(rt);
956 dev->stats.tx_carrier_errors++;
957 goto tx_error_icmp;
958 }
959 tdev = rt->dst.dev;
960
961 if (tdev == dev) {
962 ip_rt_put(rt);
963 dev->stats.collisions++;
964 goto tx_error;
965 }
966
967 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) {
968 ip_rt_put(rt);
969 goto tx_error;
970 }
971
972 if (df) {
973 mtu = dst_mtu(&rt->dst) - t_hlen;
974
975 if (mtu < 68) {
976 dev->stats.collisions++;
977 ip_rt_put(rt);
978 goto tx_error;
979 }
980
981 if (mtu < IPV6_MIN_MTU) {
982 mtu = IPV6_MIN_MTU;
983 df = 0;
984 }
985
986 if (tunnel->parms.iph.daddr)
987 skb_dst_update_pmtu_no_confirm(skb, mtu);
988
989 if (skb->len > mtu && !skb_is_gso(skb)) {
990 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
991 ip_rt_put(rt);
992 goto tx_error;
993 }
994 }
995
996 if (tunnel->err_count > 0) {
997 if (time_before(jiffies,
998 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
999 tunnel->err_count--;
1000 dst_link_failure(skb);
1001 } else
1002 tunnel->err_count = 0;
1003 }
1004
1005 /*
1006 * Okay, now see if we can stuff it in the buffer as-is.
1007 */
1008 max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen;
1009
1010 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1011 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
1012 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
1013 if (!new_skb) {
1014 ip_rt_put(rt);
1015 dev->stats.tx_dropped++;
1016 kfree_skb(skb);
1017 return NETDEV_TX_OK;
1018 }
1019 if (skb->sk)
1020 skb_set_owner_w(new_skb, skb->sk);
1021 dev_kfree_skb(skb);
1022 skb = new_skb;
1023 iph6 = ipv6_hdr(skb);
1024 }
1025 ttl = tiph->ttl;
1026 if (ttl == 0)
1027 ttl = iph6->hop_limit;
1028 tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
1029
1030 if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) {
1031 ip_rt_put(rt);
1032 goto tx_error;
1033 }
1034
1035 skb_set_inner_ipproto(skb, IPPROTO_IPV6);
1036
1037 iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl,
1038 df, !net_eq(tunnel->net, dev_net(dev)));
1039 return NETDEV_TX_OK;
1040
1041 tx_error_icmp:
1042 dst_link_failure(skb);
1043 tx_error:
1044 kfree_skb(skb);
1045 dev->stats.tx_errors++;
1046 return NETDEV_TX_OK;
1047 }
1048
1049 static netdev_tx_t sit_tunnel_xmit__(struct sk_buff *skb,
1050 struct net_device *dev, u8 ipproto)
1051 {
1052 struct ip_tunnel *tunnel = netdev_priv(dev);
1053 const struct iphdr *tiph = &tunnel->parms.iph;
1054
1055 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4))
1056 goto tx_error;
1057
1058 skb_set_inner_ipproto(skb, ipproto);
1059
1060 ip_tunnel_xmit(skb, dev, tiph, ipproto);
1061 return NETDEV_TX_OK;
1062 tx_error:
1063 kfree_skb(skb);
1064 dev->stats.tx_errors++;
1065 return NETDEV_TX_OK;
1066 }
1067
1068 static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb,
1069 struct net_device *dev)
1070 {
1071 if (!pskb_inet_may_pull(skb))
1072 goto tx_err;
1073
1074 switch (skb->protocol) {
1075 case htons(ETH_P_IP):
1076 sit_tunnel_xmit__(skb, dev, IPPROTO_IPIP);
1077 break;
1078 case htons(ETH_P_IPV6):
1079 ipip6_tunnel_xmit(skb, dev);
1080 break;
1081 #if IS_ENABLED(CONFIG_MPLS)
1082 case htons(ETH_P_MPLS_UC):
1083 sit_tunnel_xmit__(skb, dev, IPPROTO_MPLS);
1084 break;
1085 #endif
1086 default:
1087 goto tx_err;
1088 }
1089
1090 return NETDEV_TX_OK;
1091
1092 tx_err:
1093 dev->stats.tx_errors++;
1094 kfree_skb(skb);
1095 return NETDEV_TX_OK;
1096
1097 }
1098
1099 static void ipip6_tunnel_bind_dev(struct net_device *dev)
1100 {
1101 struct net_device *tdev = NULL;
1102 struct ip_tunnel *tunnel;
1103 const struct iphdr *iph;
1104 struct flowi4 fl4;
1105
1106 tunnel = netdev_priv(dev);
1107 iph = &tunnel->parms.iph;
1108
1109 if (iph->daddr) {
1110 struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4,
1111 NULL,
1112 iph->daddr, iph->saddr,
1113 0, 0,
1114 IPPROTO_IPV6,
1115 RT_TOS(iph->tos),
1116 tunnel->parms.link);
1117
1118 if (!IS_ERR(rt)) {
1119 tdev = rt->dst.dev;
1120 ip_rt_put(rt);
1121 }
1122 dev->flags |= IFF_POINTOPOINT;
1123 }
1124
1125 if (!tdev && tunnel->parms.link)
1126 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link);
1127
1128 if (tdev && !netif_is_l3_master(tdev)) {
1129 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
1130
1131 dev->mtu = tdev->mtu - t_hlen;
1132 if (dev->mtu < IPV6_MIN_MTU)
1133 dev->mtu = IPV6_MIN_MTU;
1134 }
1135 }
1136
1137 static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p,
1138 __u32 fwmark)
1139 {
1140 struct net *net = t->net;
1141 struct sit_net *sitn = net_generic(net, sit_net_id);
1142
1143 ipip6_tunnel_unlink(sitn, t);
1144 synchronize_net();
1145 t->parms.iph.saddr = p->iph.saddr;
1146 t->parms.iph.daddr = p->iph.daddr;
1147 memcpy(t->dev->dev_addr, &p->iph.saddr, 4);
1148 memcpy(t->dev->broadcast, &p->iph.daddr, 4);
1149 ipip6_tunnel_link(sitn, t);
1150 t->parms.iph.ttl = p->iph.ttl;
1151 t->parms.iph.tos = p->iph.tos;
1152 t->parms.iph.frag_off = p->iph.frag_off;
1153 if (t->parms.link != p->link || t->fwmark != fwmark) {
1154 t->parms.link = p->link;
1155 t->fwmark = fwmark;
1156 ipip6_tunnel_bind_dev(t->dev);
1157 }
1158 dst_cache_reset(&t->dst_cache);
1159 netdev_state_change(t->dev);
1160 }
1161
1162 #ifdef CONFIG_IPV6_SIT_6RD
1163 static int ipip6_tunnel_update_6rd(struct ip_tunnel *t,
1164 struct ip_tunnel_6rd *ip6rd)
1165 {
1166 struct in6_addr prefix;
1167 __be32 relay_prefix;
1168
1169 if (ip6rd->relay_prefixlen > 32 ||
1170 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64)
1171 return -EINVAL;
1172
1173 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen);
1174 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix))
1175 return -EINVAL;
1176 if (ip6rd->relay_prefixlen)
1177 relay_prefix = ip6rd->relay_prefix &
1178 htonl(0xffffffffUL <<
1179 (32 - ip6rd->relay_prefixlen));
1180 else
1181 relay_prefix = 0;
1182 if (relay_prefix != ip6rd->relay_prefix)
1183 return -EINVAL;
1184
1185 t->ip6rd.prefix = prefix;
1186 t->ip6rd.relay_prefix = relay_prefix;
1187 t->ip6rd.prefixlen = ip6rd->prefixlen;
1188 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen;
1189 dst_cache_reset(&t->dst_cache);
1190 netdev_state_change(t->dev);
1191 return 0;
1192 }
1193
1194 static int
1195 ipip6_tunnel_get6rd(struct net_device *dev, struct ifreq *ifr)
1196 {
1197 struct ip_tunnel *t = netdev_priv(dev);
1198 struct ip_tunnel_6rd ip6rd;
1199 struct ip_tunnel_parm p;
1200
1201 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) {
1202 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1203 return -EFAULT;
1204 t = ipip6_tunnel_locate(t->net, &p, 0);
1205 }
1206 if (!t)
1207 t = netdev_priv(dev);
1208
1209 ip6rd.prefix = t->ip6rd.prefix;
1210 ip6rd.relay_prefix = t->ip6rd.relay_prefix;
1211 ip6rd.prefixlen = t->ip6rd.prefixlen;
1212 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;
1213 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, sizeof(ip6rd)))
1214 return -EFAULT;
1215 return 0;
1216 }
1217
1218 static int
1219 ipip6_tunnel_6rdctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1220 {
1221 struct ip_tunnel *t = netdev_priv(dev);
1222 struct ip_tunnel_6rd ip6rd;
1223 int err;
1224
1225 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN))
1226 return -EPERM;
1227 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, sizeof(ip6rd)))
1228 return -EFAULT;
1229
1230 if (cmd != SIOCDEL6RD) {
1231 err = ipip6_tunnel_update_6rd(t, &ip6rd);
1232 if (err < 0)
1233 return err;
1234 } else
1235 ipip6_tunnel_clone_6rd(dev, dev_to_sit_net(dev));
1236 return 0;
1237 }
1238
1239 #endif /* CONFIG_IPV6_SIT_6RD */
1240
1241 static bool ipip6_valid_ip_proto(u8 ipproto)
1242 {
1243 return ipproto == IPPROTO_IPV6 ||
1244 ipproto == IPPROTO_IPIP ||
1245 #if IS_ENABLED(CONFIG_MPLS)
1246 ipproto == IPPROTO_MPLS ||
1247 #endif
1248 ipproto == 0;
1249 }
1250
1251 static int
1252 __ipip6_tunnel_ioctl_validate(struct net *net, struct ip_tunnel_parm *p)
1253 {
1254 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1255 return -EPERM;
1256
1257 if (!ipip6_valid_ip_proto(p->iph.protocol))
1258 return -EINVAL;
1259 if (p->iph.version != 4 ||
1260 p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF)))
1261 return -EINVAL;
1262
1263 if (p->iph.ttl)
1264 p->iph.frag_off |= htons(IP_DF);
1265 return 0;
1266 }
1267
1268 static int
1269 ipip6_tunnel_get(struct net_device *dev, struct ip_tunnel_parm *p)
1270 {
1271 struct ip_tunnel *t = netdev_priv(dev);
1272
1273 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev)
1274 t = ipip6_tunnel_locate(t->net, p, 0);
1275 if (!t)
1276 t = netdev_priv(dev);
1277 memcpy(p, &t->parms, sizeof(*p));
1278 return 0;
1279 }
1280
1281 static int
1282 ipip6_tunnel_add(struct net_device *dev, struct ip_tunnel_parm *p)
1283 {
1284 struct ip_tunnel *t = netdev_priv(dev);
1285 int err;
1286
1287 err = __ipip6_tunnel_ioctl_validate(t->net, p);
1288 if (err)
1289 return err;
1290
1291 t = ipip6_tunnel_locate(t->net, p, 1);
1292 if (!t)
1293 return -ENOBUFS;
1294 return 0;
1295 }
1296
1297 static int
1298 ipip6_tunnel_change(struct net_device *dev, struct ip_tunnel_parm *p)
1299 {
1300 struct ip_tunnel *t = netdev_priv(dev);
1301 int err;
1302
1303 err = __ipip6_tunnel_ioctl_validate(t->net, p);
1304 if (err)
1305 return err;
1306
1307 t = ipip6_tunnel_locate(t->net, p, 0);
1308 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) {
1309 if (!t)
1310 return -ENOENT;
1311 } else {
1312 if (t) {
1313 if (t->dev != dev)
1314 return -EEXIST;
1315 } else {
1316 if (((dev->flags & IFF_POINTOPOINT) && !p->iph.daddr) ||
1317 (!(dev->flags & IFF_POINTOPOINT) && p->iph.daddr))
1318 return -EINVAL;
1319 t = netdev_priv(dev);
1320 }
1321
1322 ipip6_tunnel_update(t, p, t->fwmark);
1323 }
1324
1325 return 0;
1326 }
1327
1328 static int
1329 ipip6_tunnel_del(struct net_device *dev, struct ip_tunnel_parm *p)
1330 {
1331 struct ip_tunnel *t = netdev_priv(dev);
1332
1333 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN))
1334 return -EPERM;
1335
1336 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) {
1337 t = ipip6_tunnel_locate(t->net, p, 0);
1338 if (!t)
1339 return -ENOENT;
1340 if (t == netdev_priv(dev_to_sit_net(dev)->fb_tunnel_dev))
1341 return -EPERM;
1342 dev = t->dev;
1343 }
1344 unregister_netdevice(dev);
1345 return 0;
1346 }
1347
1348 static int
1349 ipip6_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd)
1350 {
1351 switch (cmd) {
1352 case SIOCGETTUNNEL:
1353 return ipip6_tunnel_get(dev, p);
1354 case SIOCADDTUNNEL:
1355 return ipip6_tunnel_add(dev, p);
1356 case SIOCCHGTUNNEL:
1357 return ipip6_tunnel_change(dev, p);
1358 case SIOCDELTUNNEL:
1359 return ipip6_tunnel_del(dev, p);
1360 default:
1361 return -EINVAL;
1362 }
1363 }
1364
1365 static int
1366 ipip6_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1367 {
1368 switch (cmd) {
1369 case SIOCGETTUNNEL:
1370 case SIOCADDTUNNEL:
1371 case SIOCCHGTUNNEL:
1372 case SIOCDELTUNNEL:
1373 return ip_tunnel_ioctl(dev, ifr, cmd);
1374 case SIOCGETPRL:
1375 return ipip6_tunnel_get_prl(dev, ifr);
1376 case SIOCADDPRL:
1377 case SIOCDELPRL:
1378 case SIOCCHGPRL:
1379 return ipip6_tunnel_prl_ctl(dev, ifr, cmd);
1380 #ifdef CONFIG_IPV6_SIT_6RD
1381 case SIOCGET6RD:
1382 return ipip6_tunnel_get6rd(dev, ifr);
1383 case SIOCADD6RD:
1384 case SIOCCHG6RD:
1385 case SIOCDEL6RD:
1386 return ipip6_tunnel_6rdctl(dev, ifr, cmd);
1387 #endif
1388 default:
1389 return -EINVAL;
1390 }
1391 }
1392
1393 static const struct net_device_ops ipip6_netdev_ops = {
1394 .ndo_init = ipip6_tunnel_init,
1395 .ndo_uninit = ipip6_tunnel_uninit,
1396 .ndo_start_xmit = sit_tunnel_xmit,
1397 .ndo_do_ioctl = ipip6_tunnel_ioctl,
1398 .ndo_get_stats64 = dev_get_tstats64,
1399 .ndo_get_iflink = ip_tunnel_get_iflink,
1400 .ndo_tunnel_ctl = ipip6_tunnel_ctl,
1401 };
1402
1403 static void ipip6_dev_free(struct net_device *dev)
1404 {
1405 struct ip_tunnel *tunnel = netdev_priv(dev);
1406
1407 dst_cache_destroy(&tunnel->dst_cache);
1408 free_percpu(dev->tstats);
1409 }
1410
1411 #define SIT_FEATURES (NETIF_F_SG | \
1412 NETIF_F_FRAGLIST | \
1413 NETIF_F_HIGHDMA | \
1414 NETIF_F_GSO_SOFTWARE | \
1415 NETIF_F_HW_CSUM)
1416
1417 static void ipip6_tunnel_setup(struct net_device *dev)
1418 {
1419 struct ip_tunnel *tunnel = netdev_priv(dev);
1420 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
1421
1422 dev->netdev_ops = &ipip6_netdev_ops;
1423 dev->header_ops = &ip_tunnel_header_ops;
1424 dev->needs_free_netdev = true;
1425 dev->priv_destructor = ipip6_dev_free;
1426
1427 dev->type = ARPHRD_SIT;
1428 dev->mtu = ETH_DATA_LEN - t_hlen;
1429 dev->min_mtu = IPV6_MIN_MTU;
1430 dev->max_mtu = IP6_MAX_MTU - t_hlen;
1431 dev->flags = IFF_NOARP;
1432 netif_keep_dst(dev);
1433 dev->addr_len = 4;
1434 dev->features |= NETIF_F_LLTX;
1435 dev->features |= SIT_FEATURES;
1436 dev->hw_features |= SIT_FEATURES;
1437 }
1438
1439 static int ipip6_tunnel_init(struct net_device *dev)
1440 {
1441 struct ip_tunnel *tunnel = netdev_priv(dev);
1442 int err;
1443
1444 tunnel->dev = dev;
1445 tunnel->net = dev_net(dev);
1446 strcpy(tunnel->parms.name, dev->name);
1447
1448 ipip6_tunnel_bind_dev(dev);
1449 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1450 if (!dev->tstats)
1451 return -ENOMEM;
1452
1453 err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1454 if (err) {
1455 free_percpu(dev->tstats);
1456 dev->tstats = NULL;
1457 return err;
1458 }
1459
1460 return 0;
1461 }
1462
1463 static void __net_init ipip6_fb_tunnel_init(struct net_device *dev)
1464 {
1465 struct ip_tunnel *tunnel = netdev_priv(dev);
1466 struct iphdr *iph = &tunnel->parms.iph;
1467 struct net *net = dev_net(dev);
1468 struct sit_net *sitn = net_generic(net, sit_net_id);
1469
1470 iph->version = 4;
1471 iph->protocol = IPPROTO_IPV6;
1472 iph->ihl = 5;
1473 iph->ttl = 64;
1474
1475 dev_hold(dev);
1476 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel);
1477 }
1478
1479 static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[],
1480 struct netlink_ext_ack *extack)
1481 {
1482 u8 proto;
1483
1484 if (!data || !data[IFLA_IPTUN_PROTO])
1485 return 0;
1486
1487 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1488 if (!ipip6_valid_ip_proto(proto))
1489 return -EINVAL;
1490
1491 return 0;
1492 }
1493
1494 static void ipip6_netlink_parms(struct nlattr *data[],
1495 struct ip_tunnel_parm *parms,
1496 __u32 *fwmark)
1497 {
1498 memset(parms, 0, sizeof(*parms));
1499
1500 parms->iph.version = 4;
1501 parms->iph.protocol = IPPROTO_IPV6;
1502 parms->iph.ihl = 5;
1503 parms->iph.ttl = 64;
1504
1505 if (!data)
1506 return;
1507
1508 if (data[IFLA_IPTUN_LINK])
1509 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1510
1511 if (data[IFLA_IPTUN_LOCAL])
1512 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]);
1513
1514 if (data[IFLA_IPTUN_REMOTE])
1515 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]);
1516
1517 if (data[IFLA_IPTUN_TTL]) {
1518 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
1519 if (parms->iph.ttl)
1520 parms->iph.frag_off = htons(IP_DF);
1521 }
1522
1523 if (data[IFLA_IPTUN_TOS])
1524 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
1525
1526 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
1527 parms->iph.frag_off = htons(IP_DF);
1528
1529 if (data[IFLA_IPTUN_FLAGS])
1530 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]);
1531
1532 if (data[IFLA_IPTUN_PROTO])
1533 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1534
1535 if (data[IFLA_IPTUN_FWMARK])
1536 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
1537 }
1538
1539 /* This function returns true when ENCAP attributes are present in the nl msg */
1540 static bool ipip6_netlink_encap_parms(struct nlattr *data[],
1541 struct ip_tunnel_encap *ipencap)
1542 {
1543 bool ret = false;
1544
1545 memset(ipencap, 0, sizeof(*ipencap));
1546
1547 if (!data)
1548 return ret;
1549
1550 if (data[IFLA_IPTUN_ENCAP_TYPE]) {
1551 ret = true;
1552 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
1553 }
1554
1555 if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
1556 ret = true;
1557 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
1558 }
1559
1560 if (data[IFLA_IPTUN_ENCAP_SPORT]) {
1561 ret = true;
1562 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
1563 }
1564
1565 if (data[IFLA_IPTUN_ENCAP_DPORT]) {
1566 ret = true;
1567 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
1568 }
1569
1570 return ret;
1571 }
1572
1573 #ifdef CONFIG_IPV6_SIT_6RD
1574 /* This function returns true when 6RD attributes are present in the nl msg */
1575 static bool ipip6_netlink_6rd_parms(struct nlattr *data[],
1576 struct ip_tunnel_6rd *ip6rd)
1577 {
1578 bool ret = false;
1579 memset(ip6rd, 0, sizeof(*ip6rd));
1580
1581 if (!data)
1582 return ret;
1583
1584 if (data[IFLA_IPTUN_6RD_PREFIX]) {
1585 ret = true;
1586 ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]);
1587 }
1588
1589 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) {
1590 ret = true;
1591 ip6rd->relay_prefix =
1592 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]);
1593 }
1594
1595 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) {
1596 ret = true;
1597 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]);
1598 }
1599
1600 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) {
1601 ret = true;
1602 ip6rd->relay_prefixlen =
1603 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
1604 }
1605
1606 return ret;
1607 }
1608 #endif
1609
1610 static int ipip6_newlink(struct net *src_net, struct net_device *dev,
1611 struct nlattr *tb[], struct nlattr *data[],
1612 struct netlink_ext_ack *extack)
1613 {
1614 struct net *net = dev_net(dev);
1615 struct ip_tunnel *nt;
1616 struct ip_tunnel_encap ipencap;
1617 #ifdef CONFIG_IPV6_SIT_6RD
1618 struct ip_tunnel_6rd ip6rd;
1619 #endif
1620 int err;
1621
1622 nt = netdev_priv(dev);
1623
1624 if (ipip6_netlink_encap_parms(data, &ipencap)) {
1625 err = ip_tunnel_encap_setup(nt, &ipencap);
1626 if (err < 0)
1627 return err;
1628 }
1629
1630 ipip6_netlink_parms(data, &nt->parms, &nt->fwmark);
1631
1632 if (ipip6_tunnel_locate(net, &nt->parms, 0))
1633 return -EEXIST;
1634
1635 err = ipip6_tunnel_create(dev);
1636 if (err < 0)
1637 return err;
1638
1639 if (tb[IFLA_MTU]) {
1640 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
1641
1642 if (mtu >= IPV6_MIN_MTU &&
1643 mtu <= IP6_MAX_MTU - dev->hard_header_len)
1644 dev->mtu = mtu;
1645 }
1646
1647 #ifdef CONFIG_IPV6_SIT_6RD
1648 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1649 err = ipip6_tunnel_update_6rd(nt, &ip6rd);
1650 #endif
1651
1652 return err;
1653 }
1654
1655 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[],
1656 struct nlattr *data[],
1657 struct netlink_ext_ack *extack)
1658 {
1659 struct ip_tunnel *t = netdev_priv(dev);
1660 struct ip_tunnel_parm p;
1661 struct ip_tunnel_encap ipencap;
1662 struct net *net = t->net;
1663 struct sit_net *sitn = net_generic(net, sit_net_id);
1664 #ifdef CONFIG_IPV6_SIT_6RD
1665 struct ip_tunnel_6rd ip6rd;
1666 #endif
1667 __u32 fwmark = t->fwmark;
1668 int err;
1669
1670 if (dev == sitn->fb_tunnel_dev)
1671 return -EINVAL;
1672
1673 if (ipip6_netlink_encap_parms(data, &ipencap)) {
1674 err = ip_tunnel_encap_setup(t, &ipencap);
1675 if (err < 0)
1676 return err;
1677 }
1678
1679 ipip6_netlink_parms(data, &p, &fwmark);
1680
1681 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
1682 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
1683 return -EINVAL;
1684
1685 t = ipip6_tunnel_locate(net, &p, 0);
1686
1687 if (t) {
1688 if (t->dev != dev)
1689 return -EEXIST;
1690 } else
1691 t = netdev_priv(dev);
1692
1693 ipip6_tunnel_update(t, &p, fwmark);
1694
1695 #ifdef CONFIG_IPV6_SIT_6RD
1696 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1697 return ipip6_tunnel_update_6rd(t, &ip6rd);
1698 #endif
1699
1700 return 0;
1701 }
1702
1703 static size_t ipip6_get_size(const struct net_device *dev)
1704 {
1705 return
1706 /* IFLA_IPTUN_LINK */
1707 nla_total_size(4) +
1708 /* IFLA_IPTUN_LOCAL */
1709 nla_total_size(4) +
1710 /* IFLA_IPTUN_REMOTE */
1711 nla_total_size(4) +
1712 /* IFLA_IPTUN_TTL */
1713 nla_total_size(1) +
1714 /* IFLA_IPTUN_TOS */
1715 nla_total_size(1) +
1716 /* IFLA_IPTUN_PMTUDISC */
1717 nla_total_size(1) +
1718 /* IFLA_IPTUN_FLAGS */
1719 nla_total_size(2) +
1720 /* IFLA_IPTUN_PROTO */
1721 nla_total_size(1) +
1722 #ifdef CONFIG_IPV6_SIT_6RD
1723 /* IFLA_IPTUN_6RD_PREFIX */
1724 nla_total_size(sizeof(struct in6_addr)) +
1725 /* IFLA_IPTUN_6RD_RELAY_PREFIX */
1726 nla_total_size(4) +
1727 /* IFLA_IPTUN_6RD_PREFIXLEN */
1728 nla_total_size(2) +
1729 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */
1730 nla_total_size(2) +
1731 #endif
1732 /* IFLA_IPTUN_ENCAP_TYPE */
1733 nla_total_size(2) +
1734 /* IFLA_IPTUN_ENCAP_FLAGS */
1735 nla_total_size(2) +
1736 /* IFLA_IPTUN_ENCAP_SPORT */
1737 nla_total_size(2) +
1738 /* IFLA_IPTUN_ENCAP_DPORT */
1739 nla_total_size(2) +
1740 /* IFLA_IPTUN_FWMARK */
1741 nla_total_size(4) +
1742 0;
1743 }
1744
1745 static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1746 {
1747 struct ip_tunnel *tunnel = netdev_priv(dev);
1748 struct ip_tunnel_parm *parm = &tunnel->parms;
1749
1750 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
1751 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
1752 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
1753 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
1754 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
1755 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
1756 !!(parm->iph.frag_off & htons(IP_DF))) ||
1757 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
1758 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags) ||
1759 nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark))
1760 goto nla_put_failure;
1761
1762 #ifdef CONFIG_IPV6_SIT_6RD
1763 if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX,
1764 &tunnel->ip6rd.prefix) ||
1765 nla_put_in_addr(skb, IFLA_IPTUN_6RD_RELAY_PREFIX,
1766 tunnel->ip6rd.relay_prefix) ||
1767 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN,
1768 tunnel->ip6rd.prefixlen) ||
1769 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
1770 tunnel->ip6rd.relay_prefixlen))
1771 goto nla_put_failure;
1772 #endif
1773
1774 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE,
1775 tunnel->encap.type) ||
1776 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT,
1777 tunnel->encap.sport) ||
1778 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT,
1779 tunnel->encap.dport) ||
1780 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS,
1781 tunnel->encap.flags))
1782 goto nla_put_failure;
1783
1784 return 0;
1785
1786 nla_put_failure:
1787 return -EMSGSIZE;
1788 }
1789
1790 static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = {
1791 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1792 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 },
1793 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 },
1794 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1795 [IFLA_IPTUN_TOS] = { .type = NLA_U8 },
1796 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 },
1797 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 },
1798 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
1799 #ifdef CONFIG_IPV6_SIT_6RD
1800 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) },
1801 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 },
1802 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 },
1803 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 },
1804 #endif
1805 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
1806 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
1807 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
1808 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
1809 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
1810 };
1811
1812 static void ipip6_dellink(struct net_device *dev, struct list_head *head)
1813 {
1814 struct net *net = dev_net(dev);
1815 struct sit_net *sitn = net_generic(net, sit_net_id);
1816
1817 if (dev != sitn->fb_tunnel_dev)
1818 unregister_netdevice_queue(dev, head);
1819 }
1820
1821 static struct rtnl_link_ops sit_link_ops __read_mostly = {
1822 .kind = "sit",
1823 .maxtype = IFLA_IPTUN_MAX,
1824 .policy = ipip6_policy,
1825 .priv_size = sizeof(struct ip_tunnel),
1826 .setup = ipip6_tunnel_setup,
1827 .validate = ipip6_validate,
1828 .newlink = ipip6_newlink,
1829 .changelink = ipip6_changelink,
1830 .get_size = ipip6_get_size,
1831 .fill_info = ipip6_fill_info,
1832 .dellink = ipip6_dellink,
1833 .get_link_net = ip_tunnel_get_link_net,
1834 };
1835
1836 static struct xfrm_tunnel sit_handler __read_mostly = {
1837 .handler = ipip6_rcv,
1838 .err_handler = ipip6_err,
1839 .priority = 1,
1840 };
1841
1842 static struct xfrm_tunnel ipip_handler __read_mostly = {
1843 .handler = ipip_rcv,
1844 .err_handler = ipip6_err,
1845 .priority = 2,
1846 };
1847
1848 #if IS_ENABLED(CONFIG_MPLS)
1849 static struct xfrm_tunnel mplsip_handler __read_mostly = {
1850 .handler = mplsip_rcv,
1851 .err_handler = ipip6_err,
1852 .priority = 2,
1853 };
1854 #endif
1855
1856 static void __net_exit sit_destroy_tunnels(struct net *net,
1857 struct list_head *head)
1858 {
1859 struct sit_net *sitn = net_generic(net, sit_net_id);
1860 struct net_device *dev, *aux;
1861 int prio;
1862
1863 for_each_netdev_safe(net, dev, aux)
1864 if (dev->rtnl_link_ops == &sit_link_ops)
1865 unregister_netdevice_queue(dev, head);
1866
1867 for (prio = 1; prio < 4; prio++) {
1868 int h;
1869 for (h = 0; h < IP6_SIT_HASH_SIZE; h++) {
1870 struct ip_tunnel *t;
1871
1872 t = rtnl_dereference(sitn->tunnels[prio][h]);
1873 while (t) {
1874 /* If dev is in the same netns, it has already
1875 * been added to the list by the previous loop.
1876 */
1877 if (!net_eq(dev_net(t->dev), net))
1878 unregister_netdevice_queue(t->dev,
1879 head);
1880 t = rtnl_dereference(t->next);
1881 }
1882 }
1883 }
1884 }
1885
1886 static int __net_init sit_init_net(struct net *net)
1887 {
1888 struct sit_net *sitn = net_generic(net, sit_net_id);
1889 struct ip_tunnel *t;
1890 int err;
1891
1892 sitn->tunnels[0] = sitn->tunnels_wc;
1893 sitn->tunnels[1] = sitn->tunnels_l;
1894 sitn->tunnels[2] = sitn->tunnels_r;
1895 sitn->tunnels[3] = sitn->tunnels_r_l;
1896
1897 if (!net_has_fallback_tunnels(net))
1898 return 0;
1899
1900 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
1901 NET_NAME_UNKNOWN,
1902 ipip6_tunnel_setup);
1903 if (!sitn->fb_tunnel_dev) {
1904 err = -ENOMEM;
1905 goto err_alloc_dev;
1906 }
1907 dev_net_set(sitn->fb_tunnel_dev, net);
1908 sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops;
1909 /* FB netdevice is special: we have one, and only one per netns.
1910 * Allowing to move it to another netns is clearly unsafe.
1911 */
1912 sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1913
1914 err = register_netdev(sitn->fb_tunnel_dev);
1915 if (err)
1916 goto err_reg_dev;
1917
1918 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
1919 ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
1920
1921 t = netdev_priv(sitn->fb_tunnel_dev);
1922
1923 strcpy(t->parms.name, sitn->fb_tunnel_dev->name);
1924 return 0;
1925
1926 err_reg_dev:
1927 ipip6_dev_free(sitn->fb_tunnel_dev);
1928 free_netdev(sitn->fb_tunnel_dev);
1929 err_alloc_dev:
1930 return err;
1931 }
1932
1933 static void __net_exit sit_exit_batch_net(struct list_head *net_list)
1934 {
1935 LIST_HEAD(list);
1936 struct net *net;
1937
1938 rtnl_lock();
1939 list_for_each_entry(net, net_list, exit_list)
1940 sit_destroy_tunnels(net, &list);
1941
1942 unregister_netdevice_many(&list);
1943 rtnl_unlock();
1944 }
1945
1946 static struct pernet_operations sit_net_ops = {
1947 .init = sit_init_net,
1948 .exit_batch = sit_exit_batch_net,
1949 .id = &sit_net_id,
1950 .size = sizeof(struct sit_net),
1951 };
1952
1953 static void __exit sit_cleanup(void)
1954 {
1955 rtnl_link_unregister(&sit_link_ops);
1956 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1957 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
1958 #if IS_ENABLED(CONFIG_MPLS)
1959 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS);
1960 #endif
1961
1962 unregister_pernet_device(&sit_net_ops);
1963 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1964 }
1965
1966 static int __init sit_init(void)
1967 {
1968 int err;
1969
1970 pr_info("IPv6, IPv4 and MPLS over IPv4 tunneling driver\n");
1971
1972 err = register_pernet_device(&sit_net_ops);
1973 if (err < 0)
1974 return err;
1975 err = xfrm4_tunnel_register(&sit_handler, AF_INET6);
1976 if (err < 0) {
1977 pr_info("%s: can't register ip6ip4\n", __func__);
1978 goto xfrm_tunnel_failed;
1979 }
1980 err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
1981 if (err < 0) {
1982 pr_info("%s: can't register ip4ip4\n", __func__);
1983 goto xfrm_tunnel4_failed;
1984 }
1985 #if IS_ENABLED(CONFIG_MPLS)
1986 err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS);
1987 if (err < 0) {
1988 pr_info("%s: can't register mplsip\n", __func__);
1989 goto xfrm_tunnel_mpls_failed;
1990 }
1991 #endif
1992 err = rtnl_link_register(&sit_link_ops);
1993 if (err < 0)
1994 goto rtnl_link_failed;
1995
1996 out:
1997 return err;
1998
1999 rtnl_link_failed:
2000 #if IS_ENABLED(CONFIG_MPLS)
2001 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS);
2002 xfrm_tunnel_mpls_failed:
2003 #endif
2004 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
2005 xfrm_tunnel4_failed:
2006 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
2007 xfrm_tunnel_failed:
2008 unregister_pernet_device(&sit_net_ops);
2009 goto out;
2010 }
2011
2012 module_init(sit_init);
2013 module_exit(sit_cleanup);
2014 MODULE_LICENSE("GPL");
2015 MODULE_ALIAS_RTNL_LINK("sit");
2016 MODULE_ALIAS_NETDEV("sit0");
Linux with added FPC-III support