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Merge tag 'perf-urgent-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git...
[mirror_ubuntu-eoan-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 <asm/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 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 int sit_net_id __read_mostly;
80 struct sit_net {
81 struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE];
82 struct ip_tunnel __rcu *tunnels_r[HASH_SIZE];
83 struct ip_tunnel __rcu *tunnels_l[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, __be32 remote, __be32 local)
95 {
96 unsigned int h0 = HASH(remote);
97 unsigned int h1 = HASH(local);
98 struct ip_tunnel *t;
99 struct sit_net *sitn = net_generic(net, sit_net_id);
100
101 for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) {
102 if (local == t->parms.iph.saddr &&
103 remote == t->parms.iph.daddr &&
104 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
105 (t->dev->flags & IFF_UP))
106 return t;
107 }
108 for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) {
109 if (remote == t->parms.iph.daddr &&
110 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
111 (t->dev->flags & IFF_UP))
112 return t;
113 }
114 for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) {
115 if (local == t->parms.iph.saddr &&
116 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
117 (t->dev->flags & IFF_UP))
118 return t;
119 }
120 t = rcu_dereference(sitn->tunnels_wc[0]);
121 if ((t != NULL) && (t->dev->flags & IFF_UP))
122 return t;
123 return NULL;
124 }
125
126 static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn,
127 struct ip_tunnel_parm *parms)
128 {
129 __be32 remote = parms->iph.daddr;
130 __be32 local = parms->iph.saddr;
131 unsigned int h = 0;
132 int prio = 0;
133
134 if (remote) {
135 prio |= 2;
136 h ^= HASH(remote);
137 }
138 if (local) {
139 prio |= 1;
140 h ^= HASH(local);
141 }
142 return &sitn->tunnels[prio][h];
143 }
144
145 static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn,
146 struct ip_tunnel *t)
147 {
148 return __ipip6_bucket(sitn, &t->parms);
149 }
150
151 static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t)
152 {
153 struct ip_tunnel __rcu **tp;
154 struct ip_tunnel *iter;
155
156 for (tp = ipip6_bucket(sitn, t);
157 (iter = rtnl_dereference(*tp)) != NULL;
158 tp = &iter->next) {
159 if (t == iter) {
160 rcu_assign_pointer(*tp, t->next);
161 break;
162 }
163 }
164 }
165
166 static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t)
167 {
168 struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t);
169
170 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
171 rcu_assign_pointer(*tp, t);
172 }
173
174 static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn)
175 {
176 #ifdef CONFIG_IPV6_SIT_6RD
177 struct ip_tunnel *t = netdev_priv(dev);
178
179 if (t->dev == sitn->fb_tunnel_dev) {
180 ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0);
181 t->ip6rd.relay_prefix = 0;
182 t->ip6rd.prefixlen = 16;
183 t->ip6rd.relay_prefixlen = 0;
184 } else {
185 struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev);
186 memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd));
187 }
188 #endif
189 }
190
191 static int ipip6_tunnel_create(struct net_device *dev)
192 {
193 struct ip_tunnel *t = netdev_priv(dev);
194 struct net *net = dev_net(dev);
195 struct sit_net *sitn = net_generic(net, sit_net_id);
196 int err;
197
198 err = ipip6_tunnel_init(dev);
199 if (err < 0)
200 goto out;
201 ipip6_tunnel_clone_6rd(dev, sitn);
202
203 if ((__force u16)t->parms.i_flags & SIT_ISATAP)
204 dev->priv_flags |= IFF_ISATAP;
205
206 err = register_netdevice(dev);
207 if (err < 0)
208 goto out;
209
210 strcpy(t->parms.name, dev->name);
211 dev->rtnl_link_ops = &sit_link_ops;
212
213 dev_hold(dev);
214
215 ipip6_tunnel_link(sitn, t);
216 return 0;
217
218 out:
219 return err;
220 }
221
222 static struct ip_tunnel *ipip6_tunnel_locate(struct net *net,
223 struct ip_tunnel_parm *parms, int create)
224 {
225 __be32 remote = parms->iph.daddr;
226 __be32 local = parms->iph.saddr;
227 struct ip_tunnel *t, *nt;
228 struct ip_tunnel __rcu **tp;
229 struct net_device *dev;
230 char name[IFNAMSIZ];
231 struct sit_net *sitn = net_generic(net, sit_net_id);
232
233 for (tp = __ipip6_bucket(sitn, parms);
234 (t = rtnl_dereference(*tp)) != NULL;
235 tp = &t->next) {
236 if (local == t->parms.iph.saddr &&
237 remote == t->parms.iph.daddr &&
238 parms->link == t->parms.link) {
239 if (create)
240 return NULL;
241 else
242 return t;
243 }
244 }
245 if (!create)
246 goto failed;
247
248 if (parms->name[0])
249 strlcpy(name, parms->name, IFNAMSIZ);
250 else
251 strcpy(name, "sit%d");
252
253 dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup);
254 if (dev == NULL)
255 return NULL;
256
257 dev_net_set(dev, net);
258
259 nt = netdev_priv(dev);
260
261 nt->parms = *parms;
262 if (ipip6_tunnel_create(dev) < 0)
263 goto failed_free;
264
265 return nt;
266
267 failed_free:
268 ipip6_dev_free(dev);
269 failed:
270 return NULL;
271 }
272
273 #define for_each_prl_rcu(start) \
274 for (prl = rcu_dereference(start); \
275 prl; \
276 prl = rcu_dereference(prl->next))
277
278 static struct ip_tunnel_prl_entry *
279 __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
280 {
281 struct ip_tunnel_prl_entry *prl;
282
283 for_each_prl_rcu(t->prl)
284 if (prl->addr == addr)
285 break;
286 return prl;
287
288 }
289
290 static int ipip6_tunnel_get_prl(struct ip_tunnel *t,
291 struct ip_tunnel_prl __user *a)
292 {
293 struct ip_tunnel_prl kprl, *kp;
294 struct ip_tunnel_prl_entry *prl;
295 unsigned int cmax, c = 0, ca, len;
296 int ret = 0;
297
298 if (copy_from_user(&kprl, a, sizeof(kprl)))
299 return -EFAULT;
300 cmax = kprl.datalen / sizeof(kprl);
301 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY))
302 cmax = 1;
303
304 /* For simple GET or for root users,
305 * we try harder to allocate.
306 */
307 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
308 kcalloc(cmax, sizeof(*kp), GFP_KERNEL) :
309 NULL;
310
311 rcu_read_lock();
312
313 ca = t->prl_count < cmax ? t->prl_count : cmax;
314
315 if (!kp) {
316 /* We don't try hard to allocate much memory for
317 * non-root users.
318 * For root users, retry allocating enough memory for
319 * the answer.
320 */
321 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC);
322 if (!kp) {
323 ret = -ENOMEM;
324 goto out;
325 }
326 }
327
328 c = 0;
329 for_each_prl_rcu(t->prl) {
330 if (c >= cmax)
331 break;
332 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr)
333 continue;
334 kp[c].addr = prl->addr;
335 kp[c].flags = prl->flags;
336 c++;
337 if (kprl.addr != htonl(INADDR_ANY))
338 break;
339 }
340 out:
341 rcu_read_unlock();
342
343 len = sizeof(*kp) * c;
344 ret = 0;
345 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen))
346 ret = -EFAULT;
347
348 kfree(kp);
349
350 return ret;
351 }
352
353 static int
354 ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
355 {
356 struct ip_tunnel_prl_entry *p;
357 int err = 0;
358
359 if (a->addr == htonl(INADDR_ANY))
360 return -EINVAL;
361
362 ASSERT_RTNL();
363
364 for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) {
365 if (p->addr == a->addr) {
366 if (chg) {
367 p->flags = a->flags;
368 goto out;
369 }
370 err = -EEXIST;
371 goto out;
372 }
373 }
374
375 if (chg) {
376 err = -ENXIO;
377 goto out;
378 }
379
380 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
381 if (!p) {
382 err = -ENOBUFS;
383 goto out;
384 }
385
386 p->next = t->prl;
387 p->addr = a->addr;
388 p->flags = a->flags;
389 t->prl_count++;
390 rcu_assign_pointer(t->prl, p);
391 out:
392 return err;
393 }
394
395 static void prl_list_destroy_rcu(struct rcu_head *head)
396 {
397 struct ip_tunnel_prl_entry *p, *n;
398
399 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head);
400 do {
401 n = rcu_dereference_protected(p->next, 1);
402 kfree(p);
403 p = n;
404 } while (p);
405 }
406
407 static int
408 ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
409 {
410 struct ip_tunnel_prl_entry *x;
411 struct ip_tunnel_prl_entry __rcu **p;
412 int err = 0;
413
414 ASSERT_RTNL();
415
416 if (a && a->addr != htonl(INADDR_ANY)) {
417 for (p = &t->prl;
418 (x = rtnl_dereference(*p)) != NULL;
419 p = &x->next) {
420 if (x->addr == a->addr) {
421 *p = x->next;
422 kfree_rcu(x, rcu_head);
423 t->prl_count--;
424 goto out;
425 }
426 }
427 err = -ENXIO;
428 } else {
429 x = rtnl_dereference(t->prl);
430 if (x) {
431 t->prl_count = 0;
432 call_rcu(&x->rcu_head, prl_list_destroy_rcu);
433 t->prl = NULL;
434 }
435 }
436 out:
437 return err;
438 }
439
440 static int
441 isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t)
442 {
443 struct ip_tunnel_prl_entry *p;
444 int ok = 1;
445
446 rcu_read_lock();
447 p = __ipip6_tunnel_locate_prl(t, iph->saddr);
448 if (p) {
449 if (p->flags & PRL_DEFAULT)
450 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
451 else
452 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
453 } else {
454 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
455
456 if (ipv6_addr_is_isatap(addr6) &&
457 (addr6->s6_addr32[3] == iph->saddr) &&
458 ipv6_chk_prefix(addr6, t->dev))
459 skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
460 else
461 ok = 0;
462 }
463 rcu_read_unlock();
464 return ok;
465 }
466
467 static void ipip6_tunnel_uninit(struct net_device *dev)
468 {
469 struct ip_tunnel *tunnel = netdev_priv(dev);
470 struct sit_net *sitn = net_generic(tunnel->net, sit_net_id);
471
472 if (dev == sitn->fb_tunnel_dev) {
473 RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL);
474 } else {
475 ipip6_tunnel_unlink(sitn, tunnel);
476 ipip6_tunnel_del_prl(tunnel, NULL);
477 }
478 ip_tunnel_dst_reset_all(tunnel);
479 dev_put(dev);
480 }
481
482 /* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH
483 * if sufficient data bytes are available
484 */
485 static int ipip6_err_gen_icmpv6_unreach(struct sk_buff *skb)
486 {
487 const struct iphdr *iph = (const struct iphdr *) skb->data;
488 struct rt6_info *rt;
489 struct sk_buff *skb2;
490
491 if (!pskb_may_pull(skb, iph->ihl * 4 + sizeof(struct ipv6hdr) + 8))
492 return 1;
493
494 skb2 = skb_clone(skb, GFP_ATOMIC);
495
496 if (!skb2)
497 return 1;
498
499 skb_dst_drop(skb2);
500 skb_pull(skb2, iph->ihl * 4);
501 skb_reset_network_header(skb2);
502
503 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0, 0);
504
505 if (rt && rt->dst.dev)
506 skb2->dev = rt->dst.dev;
507
508 icmpv6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
509
510 if (rt)
511 ip6_rt_put(rt);
512
513 kfree_skb(skb2);
514
515 return 0;
516 }
517
518 static int ipip6_err(struct sk_buff *skb, u32 info)
519 {
520 const struct iphdr *iph = (const struct iphdr *)skb->data;
521 const int type = icmp_hdr(skb)->type;
522 const int code = icmp_hdr(skb)->code;
523 struct ip_tunnel *t;
524 int err;
525
526 switch (type) {
527 default:
528 case ICMP_PARAMETERPROB:
529 return 0;
530
531 case ICMP_DEST_UNREACH:
532 switch (code) {
533 case ICMP_SR_FAILED:
534 /* Impossible event. */
535 return 0;
536 default:
537 /* All others are translated to HOST_UNREACH.
538 rfc2003 contains "deep thoughts" about NET_UNREACH,
539 I believe they are just ether pollution. --ANK
540 */
541 break;
542 }
543 break;
544 case ICMP_TIME_EXCEEDED:
545 if (code != ICMP_EXC_TTL)
546 return 0;
547 break;
548 case ICMP_REDIRECT:
549 break;
550 }
551
552 err = -ENOENT;
553
554 t = ipip6_tunnel_lookup(dev_net(skb->dev),
555 skb->dev,
556 iph->daddr,
557 iph->saddr);
558 if (t == NULL)
559 goto out;
560
561 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
562 ipv4_update_pmtu(skb, dev_net(skb->dev), info,
563 t->dev->ifindex, 0, IPPROTO_IPV6, 0);
564 err = 0;
565 goto out;
566 }
567 if (type == ICMP_REDIRECT) {
568 ipv4_redirect(skb, dev_net(skb->dev), t->dev->ifindex, 0,
569 IPPROTO_IPV6, 0);
570 err = 0;
571 goto out;
572 }
573
574 if (t->parms.iph.daddr == 0)
575 goto out;
576
577 err = 0;
578 if (!ipip6_err_gen_icmpv6_unreach(skb))
579 goto out;
580
581 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
582 goto out;
583
584 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
585 t->err_count++;
586 else
587 t->err_count = 1;
588 t->err_time = jiffies;
589 out:
590 return err;
591 }
592
593 static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr,
594 const struct in6_addr *v6addr)
595 {
596 __be32 v4embed = 0;
597 if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed)
598 return true;
599 return false;
600 }
601
602 /* Checks if an address matches an address on the tunnel interface.
603 * Used to detect the NAT of proto 41 packets and let them pass spoofing test.
604 * Long story:
605 * This function is called after we considered the packet as spoofed
606 * in is_spoofed_6rd.
607 * We may have a router that is doing NAT for proto 41 packets
608 * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb
609 * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd
610 * function will return true, dropping the packet.
611 * But, we can still check if is spoofed against the IP
612 * addresses associated with the interface.
613 */
614 static bool only_dnatted(const struct ip_tunnel *tunnel,
615 const struct in6_addr *v6dst)
616 {
617 int prefix_len;
618
619 #ifdef CONFIG_IPV6_SIT_6RD
620 prefix_len = tunnel->ip6rd.prefixlen + 32
621 - tunnel->ip6rd.relay_prefixlen;
622 #else
623 prefix_len = 48;
624 #endif
625 return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev);
626 }
627
628 /* Returns true if a packet is spoofed */
629 static bool packet_is_spoofed(struct sk_buff *skb,
630 const struct iphdr *iph,
631 struct ip_tunnel *tunnel)
632 {
633 const struct ipv6hdr *ipv6h;
634
635 if (tunnel->dev->priv_flags & IFF_ISATAP) {
636 if (!isatap_chksrc(skb, iph, tunnel))
637 return true;
638
639 return false;
640 }
641
642 if (tunnel->dev->flags & IFF_POINTOPOINT)
643 return false;
644
645 ipv6h = ipv6_hdr(skb);
646
647 if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) {
648 net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
649 &iph->saddr, &ipv6h->saddr,
650 &iph->daddr, &ipv6h->daddr);
651 return true;
652 }
653
654 if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr)))
655 return false;
656
657 if (only_dnatted(tunnel, &ipv6h->daddr))
658 return false;
659
660 net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
661 &iph->saddr, &ipv6h->saddr,
662 &iph->daddr, &ipv6h->daddr);
663 return true;
664 }
665
666 static int ipip6_rcv(struct sk_buff *skb)
667 {
668 const struct iphdr *iph = ip_hdr(skb);
669 struct ip_tunnel *tunnel;
670 int err;
671
672 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
673 iph->saddr, iph->daddr);
674 if (tunnel != NULL) {
675 struct pcpu_sw_netstats *tstats;
676
677 if (tunnel->parms.iph.protocol != IPPROTO_IPV6 &&
678 tunnel->parms.iph.protocol != 0)
679 goto out;
680
681 skb->mac_header = skb->network_header;
682 skb_reset_network_header(skb);
683 IPCB(skb)->flags = 0;
684 skb->protocol = htons(ETH_P_IPV6);
685
686 if (packet_is_spoofed(skb, iph, tunnel)) {
687 tunnel->dev->stats.rx_errors++;
688 goto out;
689 }
690
691 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
692
693 err = IP_ECN_decapsulate(iph, skb);
694 if (unlikely(err)) {
695 if (log_ecn_error)
696 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
697 &iph->saddr, iph->tos);
698 if (err > 1) {
699 ++tunnel->dev->stats.rx_frame_errors;
700 ++tunnel->dev->stats.rx_errors;
701 goto out;
702 }
703 }
704
705 tstats = this_cpu_ptr(tunnel->dev->tstats);
706 u64_stats_update_begin(&tstats->syncp);
707 tstats->rx_packets++;
708 tstats->rx_bytes += skb->len;
709 u64_stats_update_end(&tstats->syncp);
710
711 netif_rx(skb);
712
713 return 0;
714 }
715
716 /* no tunnel matched, let upstream know, ipsec may handle it */
717 return 1;
718 out:
719 kfree_skb(skb);
720 return 0;
721 }
722
723 static const struct tnl_ptk_info tpi = {
724 /* no tunnel info required for ipip. */
725 .proto = htons(ETH_P_IP),
726 };
727
728 static int ipip_rcv(struct sk_buff *skb)
729 {
730 const struct iphdr *iph;
731 struct ip_tunnel *tunnel;
732
733 iph = ip_hdr(skb);
734 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
735 iph->saddr, iph->daddr);
736 if (tunnel != NULL) {
737 if (tunnel->parms.iph.protocol != IPPROTO_IPIP &&
738 tunnel->parms.iph.protocol != 0)
739 goto drop;
740
741 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
742 goto drop;
743 if (iptunnel_pull_header(skb, 0, tpi.proto))
744 goto drop;
745 return ip_tunnel_rcv(tunnel, skb, &tpi, log_ecn_error);
746 }
747
748 return 1;
749
750 drop:
751 kfree_skb(skb);
752 return 0;
753 }
754
755 /*
756 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function
757 * stores the embedded IPv4 address in v4dst and returns true.
758 */
759 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
760 __be32 *v4dst)
761 {
762 #ifdef CONFIG_IPV6_SIT_6RD
763 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix,
764 tunnel->ip6rd.prefixlen)) {
765 unsigned int pbw0, pbi0;
766 int pbi1;
767 u32 d;
768
769 pbw0 = tunnel->ip6rd.prefixlen >> 5;
770 pbi0 = tunnel->ip6rd.prefixlen & 0x1f;
771
772 d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
773 tunnel->ip6rd.relay_prefixlen;
774
775 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;
776 if (pbi1 > 0)
777 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >>
778 (32 - pbi1);
779
780 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d);
781 return true;
782 }
783 #else
784 if (v6dst->s6_addr16[0] == htons(0x2002)) {
785 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
786 memcpy(v4dst, &v6dst->s6_addr16[1], 4);
787 return true;
788 }
789 #endif
790 return false;
791 }
792
793 static inline __be32 try_6rd(struct ip_tunnel *tunnel,
794 const struct in6_addr *v6dst)
795 {
796 __be32 dst = 0;
797 check_6rd(tunnel, v6dst, &dst);
798 return dst;
799 }
800
801 /*
802 * This function assumes it is being called from dev_queue_xmit()
803 * and that skb is filled properly by that function.
804 */
805
806 static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
807 struct net_device *dev)
808 {
809 struct ip_tunnel *tunnel = netdev_priv(dev);
810 const struct iphdr *tiph = &tunnel->parms.iph;
811 const struct ipv6hdr *iph6 = ipv6_hdr(skb);
812 u8 tos = tunnel->parms.iph.tos;
813 __be16 df = tiph->frag_off;
814 struct rtable *rt; /* Route to the other host */
815 struct net_device *tdev; /* Device to other host */
816 unsigned int max_headroom; /* The extra header space needed */
817 __be32 dst = tiph->daddr;
818 struct flowi4 fl4;
819 int mtu;
820 const struct in6_addr *addr6;
821 int addr_type;
822 u8 ttl;
823 int err;
824
825 if (skb->protocol != htons(ETH_P_IPV6))
826 goto tx_error;
827
828 if (tos == 1)
829 tos = ipv6_get_dsfield(iph6);
830
831 /* ISATAP (RFC4214) - must come before 6to4 */
832 if (dev->priv_flags & IFF_ISATAP) {
833 struct neighbour *neigh = NULL;
834 bool do_tx_error = false;
835
836 if (skb_dst(skb))
837 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
838
839 if (neigh == NULL) {
840 net_dbg_ratelimited("nexthop == NULL\n");
841 goto tx_error;
842 }
843
844 addr6 = (const struct in6_addr *)&neigh->primary_key;
845 addr_type = ipv6_addr_type(addr6);
846
847 if ((addr_type & IPV6_ADDR_UNICAST) &&
848 ipv6_addr_is_isatap(addr6))
849 dst = addr6->s6_addr32[3];
850 else
851 do_tx_error = true;
852
853 neigh_release(neigh);
854 if (do_tx_error)
855 goto tx_error;
856 }
857
858 if (!dst)
859 dst = try_6rd(tunnel, &iph6->daddr);
860
861 if (!dst) {
862 struct neighbour *neigh = NULL;
863 bool do_tx_error = false;
864
865 if (skb_dst(skb))
866 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
867
868 if (neigh == NULL) {
869 net_dbg_ratelimited("nexthop == NULL\n");
870 goto tx_error;
871 }
872
873 addr6 = (const struct in6_addr *)&neigh->primary_key;
874 addr_type = ipv6_addr_type(addr6);
875
876 if (addr_type == IPV6_ADDR_ANY) {
877 addr6 = &ipv6_hdr(skb)->daddr;
878 addr_type = ipv6_addr_type(addr6);
879 }
880
881 if ((addr_type & IPV6_ADDR_COMPATv4) != 0)
882 dst = addr6->s6_addr32[3];
883 else
884 do_tx_error = true;
885
886 neigh_release(neigh);
887 if (do_tx_error)
888 goto tx_error;
889 }
890
891 rt = ip_route_output_ports(tunnel->net, &fl4, NULL,
892 dst, tiph->saddr,
893 0, 0,
894 IPPROTO_IPV6, RT_TOS(tos),
895 tunnel->parms.link);
896 if (IS_ERR(rt)) {
897 dev->stats.tx_carrier_errors++;
898 goto tx_error_icmp;
899 }
900 if (rt->rt_type != RTN_UNICAST) {
901 ip_rt_put(rt);
902 dev->stats.tx_carrier_errors++;
903 goto tx_error_icmp;
904 }
905 tdev = rt->dst.dev;
906
907 if (tdev == dev) {
908 ip_rt_put(rt);
909 dev->stats.collisions++;
910 goto tx_error;
911 }
912
913 if (df) {
914 mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr);
915
916 if (mtu < 68) {
917 dev->stats.collisions++;
918 ip_rt_put(rt);
919 goto tx_error;
920 }
921
922 if (mtu < IPV6_MIN_MTU) {
923 mtu = IPV6_MIN_MTU;
924 df = 0;
925 }
926
927 if (tunnel->parms.iph.daddr && skb_dst(skb))
928 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
929
930 if (skb->len > mtu && !skb_is_gso(skb)) {
931 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
932 ip_rt_put(rt);
933 goto tx_error;
934 }
935 }
936
937 if (tunnel->err_count > 0) {
938 if (time_before(jiffies,
939 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
940 tunnel->err_count--;
941 dst_link_failure(skb);
942 } else
943 tunnel->err_count = 0;
944 }
945
946 /*
947 * Okay, now see if we can stuff it in the buffer as-is.
948 */
949 max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr);
950
951 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
952 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
953 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
954 if (!new_skb) {
955 ip_rt_put(rt);
956 dev->stats.tx_dropped++;
957 kfree_skb(skb);
958 return NETDEV_TX_OK;
959 }
960 if (skb->sk)
961 skb_set_owner_w(new_skb, skb->sk);
962 dev_kfree_skb(skb);
963 skb = new_skb;
964 iph6 = ipv6_hdr(skb);
965 }
966 ttl = tiph->ttl;
967 if (ttl == 0)
968 ttl = iph6->hop_limit;
969 tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
970
971 skb = iptunnel_handle_offloads(skb, false, SKB_GSO_SIT);
972 if (IS_ERR(skb)) {
973 ip_rt_put(rt);
974 goto out;
975 }
976
977 err = iptunnel_xmit(rt, skb, fl4.saddr, fl4.daddr, IPPROTO_IPV6, tos,
978 ttl, df, !net_eq(tunnel->net, dev_net(dev)));
979 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
980 return NETDEV_TX_OK;
981
982 tx_error_icmp:
983 dst_link_failure(skb);
984 tx_error:
985 kfree_skb(skb);
986 out:
987 dev->stats.tx_errors++;
988 return NETDEV_TX_OK;
989 }
990
991 static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
992 {
993 struct ip_tunnel *tunnel = netdev_priv(dev);
994 const struct iphdr *tiph = &tunnel->parms.iph;
995
996 skb = iptunnel_handle_offloads(skb, false, SKB_GSO_IPIP);
997 if (IS_ERR(skb))
998 goto out;
999
1000 ip_tunnel_xmit(skb, dev, tiph, IPPROTO_IPIP);
1001 return NETDEV_TX_OK;
1002 out:
1003 dev->stats.tx_errors++;
1004 return NETDEV_TX_OK;
1005 }
1006
1007 static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb,
1008 struct net_device *dev)
1009 {
1010 switch (skb->protocol) {
1011 case htons(ETH_P_IP):
1012 ipip_tunnel_xmit(skb, dev);
1013 break;
1014 case htons(ETH_P_IPV6):
1015 ipip6_tunnel_xmit(skb, dev);
1016 break;
1017 default:
1018 goto tx_err;
1019 }
1020
1021 return NETDEV_TX_OK;
1022
1023 tx_err:
1024 dev->stats.tx_errors++;
1025 kfree_skb(skb);
1026 return NETDEV_TX_OK;
1027
1028 }
1029
1030 static void ipip6_tunnel_bind_dev(struct net_device *dev)
1031 {
1032 struct net_device *tdev = NULL;
1033 struct ip_tunnel *tunnel;
1034 const struct iphdr *iph;
1035 struct flowi4 fl4;
1036
1037 tunnel = netdev_priv(dev);
1038 iph = &tunnel->parms.iph;
1039
1040 if (iph->daddr) {
1041 struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4,
1042 NULL,
1043 iph->daddr, iph->saddr,
1044 0, 0,
1045 IPPROTO_IPV6,
1046 RT_TOS(iph->tos),
1047 tunnel->parms.link);
1048
1049 if (!IS_ERR(rt)) {
1050 tdev = rt->dst.dev;
1051 ip_rt_put(rt);
1052 }
1053 dev->flags |= IFF_POINTOPOINT;
1054 }
1055
1056 if (!tdev && tunnel->parms.link)
1057 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link);
1058
1059 if (tdev) {
1060 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
1061 dev->mtu = tdev->mtu - sizeof(struct iphdr);
1062 if (dev->mtu < IPV6_MIN_MTU)
1063 dev->mtu = IPV6_MIN_MTU;
1064 }
1065 dev->iflink = tunnel->parms.link;
1066 }
1067
1068 static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p)
1069 {
1070 struct net *net = t->net;
1071 struct sit_net *sitn = net_generic(net, sit_net_id);
1072
1073 ipip6_tunnel_unlink(sitn, t);
1074 synchronize_net();
1075 t->parms.iph.saddr = p->iph.saddr;
1076 t->parms.iph.daddr = p->iph.daddr;
1077 memcpy(t->dev->dev_addr, &p->iph.saddr, 4);
1078 memcpy(t->dev->broadcast, &p->iph.daddr, 4);
1079 ipip6_tunnel_link(sitn, t);
1080 t->parms.iph.ttl = p->iph.ttl;
1081 t->parms.iph.tos = p->iph.tos;
1082 if (t->parms.link != p->link) {
1083 t->parms.link = p->link;
1084 ipip6_tunnel_bind_dev(t->dev);
1085 }
1086 ip_tunnel_dst_reset_all(t);
1087 netdev_state_change(t->dev);
1088 }
1089
1090 #ifdef CONFIG_IPV6_SIT_6RD
1091 static int ipip6_tunnel_update_6rd(struct ip_tunnel *t,
1092 struct ip_tunnel_6rd *ip6rd)
1093 {
1094 struct in6_addr prefix;
1095 __be32 relay_prefix;
1096
1097 if (ip6rd->relay_prefixlen > 32 ||
1098 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64)
1099 return -EINVAL;
1100
1101 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen);
1102 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix))
1103 return -EINVAL;
1104 if (ip6rd->relay_prefixlen)
1105 relay_prefix = ip6rd->relay_prefix &
1106 htonl(0xffffffffUL <<
1107 (32 - ip6rd->relay_prefixlen));
1108 else
1109 relay_prefix = 0;
1110 if (relay_prefix != ip6rd->relay_prefix)
1111 return -EINVAL;
1112
1113 t->ip6rd.prefix = prefix;
1114 t->ip6rd.relay_prefix = relay_prefix;
1115 t->ip6rd.prefixlen = ip6rd->prefixlen;
1116 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen;
1117 ip_tunnel_dst_reset_all(t);
1118 netdev_state_change(t->dev);
1119 return 0;
1120 }
1121 #endif
1122
1123 static int
1124 ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
1125 {
1126 int err = 0;
1127 struct ip_tunnel_parm p;
1128 struct ip_tunnel_prl prl;
1129 struct ip_tunnel *t;
1130 struct net *net = dev_net(dev);
1131 struct sit_net *sitn = net_generic(net, sit_net_id);
1132 #ifdef CONFIG_IPV6_SIT_6RD
1133 struct ip_tunnel_6rd ip6rd;
1134 #endif
1135
1136 switch (cmd) {
1137 case SIOCGETTUNNEL:
1138 #ifdef CONFIG_IPV6_SIT_6RD
1139 case SIOCGET6RD:
1140 #endif
1141 t = NULL;
1142 if (dev == sitn->fb_tunnel_dev) {
1143 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1144 err = -EFAULT;
1145 break;
1146 }
1147 t = ipip6_tunnel_locate(net, &p, 0);
1148 }
1149 if (t == NULL)
1150 t = netdev_priv(dev);
1151
1152 err = -EFAULT;
1153 if (cmd == SIOCGETTUNNEL) {
1154 memcpy(&p, &t->parms, sizeof(p));
1155 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p,
1156 sizeof(p)))
1157 goto done;
1158 #ifdef CONFIG_IPV6_SIT_6RD
1159 } else {
1160 ip6rd.prefix = t->ip6rd.prefix;
1161 ip6rd.relay_prefix = t->ip6rd.relay_prefix;
1162 ip6rd.prefixlen = t->ip6rd.prefixlen;
1163 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;
1164 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd,
1165 sizeof(ip6rd)))
1166 goto done;
1167 #endif
1168 }
1169 err = 0;
1170 break;
1171
1172 case SIOCADDTUNNEL:
1173 case SIOCCHGTUNNEL:
1174 err = -EPERM;
1175 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1176 goto done;
1177
1178 err = -EFAULT;
1179 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1180 goto done;
1181
1182 err = -EINVAL;
1183 if (p.iph.protocol != IPPROTO_IPV6 &&
1184 p.iph.protocol != IPPROTO_IPIP &&
1185 p.iph.protocol != 0)
1186 goto done;
1187 if (p.iph.version != 4 ||
1188 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
1189 goto done;
1190 if (p.iph.ttl)
1191 p.iph.frag_off |= htons(IP_DF);
1192
1193 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
1194
1195 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1196 if (t != NULL) {
1197 if (t->dev != dev) {
1198 err = -EEXIST;
1199 break;
1200 }
1201 } else {
1202 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
1203 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
1204 err = -EINVAL;
1205 break;
1206 }
1207 t = netdev_priv(dev);
1208 }
1209
1210 ipip6_tunnel_update(t, &p);
1211 }
1212
1213 if (t) {
1214 err = 0;
1215 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
1216 err = -EFAULT;
1217 } else
1218 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1219 break;
1220
1221 case SIOCDELTUNNEL:
1222 err = -EPERM;
1223 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1224 goto done;
1225
1226 if (dev == sitn->fb_tunnel_dev) {
1227 err = -EFAULT;
1228 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1229 goto done;
1230 err = -ENOENT;
1231 if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL)
1232 goto done;
1233 err = -EPERM;
1234 if (t == netdev_priv(sitn->fb_tunnel_dev))
1235 goto done;
1236 dev = t->dev;
1237 }
1238 unregister_netdevice(dev);
1239 err = 0;
1240 break;
1241
1242 case SIOCGETPRL:
1243 err = -EINVAL;
1244 if (dev == sitn->fb_tunnel_dev)
1245 goto done;
1246 err = -ENOENT;
1247 if (!(t = netdev_priv(dev)))
1248 goto done;
1249 err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data);
1250 break;
1251
1252 case SIOCADDPRL:
1253 case SIOCDELPRL:
1254 case SIOCCHGPRL:
1255 err = -EPERM;
1256 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1257 goto done;
1258 err = -EINVAL;
1259 if (dev == sitn->fb_tunnel_dev)
1260 goto done;
1261 err = -EFAULT;
1262 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
1263 goto done;
1264 err = -ENOENT;
1265 if (!(t = netdev_priv(dev)))
1266 goto done;
1267
1268 switch (cmd) {
1269 case SIOCDELPRL:
1270 err = ipip6_tunnel_del_prl(t, &prl);
1271 break;
1272 case SIOCADDPRL:
1273 case SIOCCHGPRL:
1274 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
1275 break;
1276 }
1277 ip_tunnel_dst_reset_all(t);
1278 netdev_state_change(dev);
1279 break;
1280
1281 #ifdef CONFIG_IPV6_SIT_6RD
1282 case SIOCADD6RD:
1283 case SIOCCHG6RD:
1284 case SIOCDEL6RD:
1285 err = -EPERM;
1286 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1287 goto done;
1288
1289 err = -EFAULT;
1290 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data,
1291 sizeof(ip6rd)))
1292 goto done;
1293
1294 t = netdev_priv(dev);
1295
1296 if (cmd != SIOCDEL6RD) {
1297 err = ipip6_tunnel_update_6rd(t, &ip6rd);
1298 if (err < 0)
1299 goto done;
1300 } else
1301 ipip6_tunnel_clone_6rd(dev, sitn);
1302
1303 err = 0;
1304 break;
1305 #endif
1306
1307 default:
1308 err = -EINVAL;
1309 }
1310
1311 done:
1312 return err;
1313 }
1314
1315 static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1316 {
1317 if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr))
1318 return -EINVAL;
1319 dev->mtu = new_mtu;
1320 return 0;
1321 }
1322
1323 static const struct net_device_ops ipip6_netdev_ops = {
1324 .ndo_uninit = ipip6_tunnel_uninit,
1325 .ndo_start_xmit = sit_tunnel_xmit,
1326 .ndo_do_ioctl = ipip6_tunnel_ioctl,
1327 .ndo_change_mtu = ipip6_tunnel_change_mtu,
1328 .ndo_get_stats64 = ip_tunnel_get_stats64,
1329 };
1330
1331 static void ipip6_dev_free(struct net_device *dev)
1332 {
1333 struct ip_tunnel *tunnel = netdev_priv(dev);
1334
1335 free_percpu(tunnel->dst_cache);
1336 free_percpu(dev->tstats);
1337 free_netdev(dev);
1338 }
1339
1340 #define SIT_FEATURES (NETIF_F_SG | \
1341 NETIF_F_FRAGLIST | \
1342 NETIF_F_HIGHDMA | \
1343 NETIF_F_GSO_SOFTWARE | \
1344 NETIF_F_HW_CSUM)
1345
1346 static void ipip6_tunnel_setup(struct net_device *dev)
1347 {
1348 dev->netdev_ops = &ipip6_netdev_ops;
1349 dev->destructor = ipip6_dev_free;
1350
1351 dev->type = ARPHRD_SIT;
1352 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
1353 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr);
1354 dev->flags = IFF_NOARP;
1355 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1356 dev->iflink = 0;
1357 dev->addr_len = 4;
1358 dev->features |= NETIF_F_LLTX;
1359 dev->features |= SIT_FEATURES;
1360 dev->hw_features |= SIT_FEATURES;
1361 }
1362
1363 static int ipip6_tunnel_init(struct net_device *dev)
1364 {
1365 struct ip_tunnel *tunnel = netdev_priv(dev);
1366 int i;
1367
1368 tunnel->dev = dev;
1369 tunnel->net = dev_net(dev);
1370
1371 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
1372 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
1373
1374 ipip6_tunnel_bind_dev(dev);
1375 dev->tstats = alloc_percpu(struct pcpu_sw_netstats);
1376 if (!dev->tstats)
1377 return -ENOMEM;
1378
1379 for_each_possible_cpu(i) {
1380 struct pcpu_sw_netstats *ipip6_tunnel_stats;
1381 ipip6_tunnel_stats = per_cpu_ptr(dev->tstats, i);
1382 u64_stats_init(&ipip6_tunnel_stats->syncp);
1383 }
1384
1385 tunnel->dst_cache = alloc_percpu(struct ip_tunnel_dst);
1386 if (!tunnel->dst_cache) {
1387 free_percpu(dev->tstats);
1388 return -ENOMEM;
1389 }
1390
1391 return 0;
1392 }
1393
1394 static int __net_init ipip6_fb_tunnel_init(struct net_device *dev)
1395 {
1396 struct ip_tunnel *tunnel = netdev_priv(dev);
1397 struct iphdr *iph = &tunnel->parms.iph;
1398 struct net *net = dev_net(dev);
1399 struct sit_net *sitn = net_generic(net, sit_net_id);
1400 int i;
1401
1402 tunnel->dev = dev;
1403 tunnel->net = dev_net(dev);
1404 strcpy(tunnel->parms.name, dev->name);
1405
1406 iph->version = 4;
1407 iph->protocol = IPPROTO_IPV6;
1408 iph->ihl = 5;
1409 iph->ttl = 64;
1410
1411 dev->tstats = alloc_percpu(struct pcpu_sw_netstats);
1412 if (!dev->tstats)
1413 return -ENOMEM;
1414
1415 for_each_possible_cpu(i) {
1416 struct pcpu_sw_netstats *ipip6_fb_stats;
1417 ipip6_fb_stats = per_cpu_ptr(dev->tstats, i);
1418 u64_stats_init(&ipip6_fb_stats->syncp);
1419 }
1420
1421 tunnel->dst_cache = alloc_percpu(struct ip_tunnel_dst);
1422 if (!tunnel->dst_cache) {
1423 free_percpu(dev->tstats);
1424 return -ENOMEM;
1425 }
1426
1427 dev_hold(dev);
1428 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel);
1429 return 0;
1430 }
1431
1432 static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[])
1433 {
1434 u8 proto;
1435
1436 if (!data || !data[IFLA_IPTUN_PROTO])
1437 return 0;
1438
1439 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1440 if (proto != IPPROTO_IPV6 &&
1441 proto != IPPROTO_IPIP &&
1442 proto != 0)
1443 return -EINVAL;
1444
1445 return 0;
1446 }
1447
1448 static void ipip6_netlink_parms(struct nlattr *data[],
1449 struct ip_tunnel_parm *parms)
1450 {
1451 memset(parms, 0, sizeof(*parms));
1452
1453 parms->iph.version = 4;
1454 parms->iph.protocol = IPPROTO_IPV6;
1455 parms->iph.ihl = 5;
1456 parms->iph.ttl = 64;
1457
1458 if (!data)
1459 return;
1460
1461 if (data[IFLA_IPTUN_LINK])
1462 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1463
1464 if (data[IFLA_IPTUN_LOCAL])
1465 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]);
1466
1467 if (data[IFLA_IPTUN_REMOTE])
1468 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]);
1469
1470 if (data[IFLA_IPTUN_TTL]) {
1471 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
1472 if (parms->iph.ttl)
1473 parms->iph.frag_off = htons(IP_DF);
1474 }
1475
1476 if (data[IFLA_IPTUN_TOS])
1477 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
1478
1479 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
1480 parms->iph.frag_off = htons(IP_DF);
1481
1482 if (data[IFLA_IPTUN_FLAGS])
1483 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]);
1484
1485 if (data[IFLA_IPTUN_PROTO])
1486 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1487
1488 }
1489
1490 #ifdef CONFIG_IPV6_SIT_6RD
1491 /* This function returns true when 6RD attributes are present in the nl msg */
1492 static bool ipip6_netlink_6rd_parms(struct nlattr *data[],
1493 struct ip_tunnel_6rd *ip6rd)
1494 {
1495 bool ret = false;
1496 memset(ip6rd, 0, sizeof(*ip6rd));
1497
1498 if (!data)
1499 return ret;
1500
1501 if (data[IFLA_IPTUN_6RD_PREFIX]) {
1502 ret = true;
1503 nla_memcpy(&ip6rd->prefix, data[IFLA_IPTUN_6RD_PREFIX],
1504 sizeof(struct in6_addr));
1505 }
1506
1507 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) {
1508 ret = true;
1509 ip6rd->relay_prefix =
1510 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]);
1511 }
1512
1513 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) {
1514 ret = true;
1515 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]);
1516 }
1517
1518 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) {
1519 ret = true;
1520 ip6rd->relay_prefixlen =
1521 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
1522 }
1523
1524 return ret;
1525 }
1526 #endif
1527
1528 static int ipip6_newlink(struct net *src_net, struct net_device *dev,
1529 struct nlattr *tb[], struct nlattr *data[])
1530 {
1531 struct net *net = dev_net(dev);
1532 struct ip_tunnel *nt;
1533 #ifdef CONFIG_IPV6_SIT_6RD
1534 struct ip_tunnel_6rd ip6rd;
1535 #endif
1536 int err;
1537
1538 nt = netdev_priv(dev);
1539 ipip6_netlink_parms(data, &nt->parms);
1540
1541 if (ipip6_tunnel_locate(net, &nt->parms, 0))
1542 return -EEXIST;
1543
1544 err = ipip6_tunnel_create(dev);
1545 if (err < 0)
1546 return err;
1547
1548 #ifdef CONFIG_IPV6_SIT_6RD
1549 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1550 err = ipip6_tunnel_update_6rd(nt, &ip6rd);
1551 #endif
1552
1553 return err;
1554 }
1555
1556 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[],
1557 struct nlattr *data[])
1558 {
1559 struct ip_tunnel *t = netdev_priv(dev);
1560 struct ip_tunnel_parm p;
1561 struct net *net = t->net;
1562 struct sit_net *sitn = net_generic(net, sit_net_id);
1563 #ifdef CONFIG_IPV6_SIT_6RD
1564 struct ip_tunnel_6rd ip6rd;
1565 #endif
1566
1567 if (dev == sitn->fb_tunnel_dev)
1568 return -EINVAL;
1569
1570 ipip6_netlink_parms(data, &p);
1571
1572 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
1573 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
1574 return -EINVAL;
1575
1576 t = ipip6_tunnel_locate(net, &p, 0);
1577
1578 if (t) {
1579 if (t->dev != dev)
1580 return -EEXIST;
1581 } else
1582 t = netdev_priv(dev);
1583
1584 ipip6_tunnel_update(t, &p);
1585
1586 #ifdef CONFIG_IPV6_SIT_6RD
1587 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1588 return ipip6_tunnel_update_6rd(t, &ip6rd);
1589 #endif
1590
1591 return 0;
1592 }
1593
1594 static size_t ipip6_get_size(const struct net_device *dev)
1595 {
1596 return
1597 /* IFLA_IPTUN_LINK */
1598 nla_total_size(4) +
1599 /* IFLA_IPTUN_LOCAL */
1600 nla_total_size(4) +
1601 /* IFLA_IPTUN_REMOTE */
1602 nla_total_size(4) +
1603 /* IFLA_IPTUN_TTL */
1604 nla_total_size(1) +
1605 /* IFLA_IPTUN_TOS */
1606 nla_total_size(1) +
1607 /* IFLA_IPTUN_PMTUDISC */
1608 nla_total_size(1) +
1609 /* IFLA_IPTUN_FLAGS */
1610 nla_total_size(2) +
1611 /* IFLA_IPTUN_PROTO */
1612 nla_total_size(1) +
1613 #ifdef CONFIG_IPV6_SIT_6RD
1614 /* IFLA_IPTUN_6RD_PREFIX */
1615 nla_total_size(sizeof(struct in6_addr)) +
1616 /* IFLA_IPTUN_6RD_RELAY_PREFIX */
1617 nla_total_size(4) +
1618 /* IFLA_IPTUN_6RD_PREFIXLEN */
1619 nla_total_size(2) +
1620 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */
1621 nla_total_size(2) +
1622 #endif
1623 0;
1624 }
1625
1626 static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1627 {
1628 struct ip_tunnel *tunnel = netdev_priv(dev);
1629 struct ip_tunnel_parm *parm = &tunnel->parms;
1630
1631 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
1632 nla_put_be32(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
1633 nla_put_be32(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
1634 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
1635 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
1636 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
1637 !!(parm->iph.frag_off & htons(IP_DF))) ||
1638 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
1639 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags))
1640 goto nla_put_failure;
1641
1642 #ifdef CONFIG_IPV6_SIT_6RD
1643 if (nla_put(skb, IFLA_IPTUN_6RD_PREFIX, sizeof(struct in6_addr),
1644 &tunnel->ip6rd.prefix) ||
1645 nla_put_be32(skb, IFLA_IPTUN_6RD_RELAY_PREFIX,
1646 tunnel->ip6rd.relay_prefix) ||
1647 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN,
1648 tunnel->ip6rd.prefixlen) ||
1649 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
1650 tunnel->ip6rd.relay_prefixlen))
1651 goto nla_put_failure;
1652 #endif
1653
1654 return 0;
1655
1656 nla_put_failure:
1657 return -EMSGSIZE;
1658 }
1659
1660 static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = {
1661 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1662 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 },
1663 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 },
1664 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1665 [IFLA_IPTUN_TOS] = { .type = NLA_U8 },
1666 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 },
1667 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 },
1668 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
1669 #ifdef CONFIG_IPV6_SIT_6RD
1670 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) },
1671 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 },
1672 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 },
1673 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 },
1674 #endif
1675 };
1676
1677 static void ipip6_dellink(struct net_device *dev, struct list_head *head)
1678 {
1679 struct net *net = dev_net(dev);
1680 struct sit_net *sitn = net_generic(net, sit_net_id);
1681
1682 if (dev != sitn->fb_tunnel_dev)
1683 unregister_netdevice_queue(dev, head);
1684 }
1685
1686 static struct rtnl_link_ops sit_link_ops __read_mostly = {
1687 .kind = "sit",
1688 .maxtype = IFLA_IPTUN_MAX,
1689 .policy = ipip6_policy,
1690 .priv_size = sizeof(struct ip_tunnel),
1691 .setup = ipip6_tunnel_setup,
1692 .validate = ipip6_validate,
1693 .newlink = ipip6_newlink,
1694 .changelink = ipip6_changelink,
1695 .get_size = ipip6_get_size,
1696 .fill_info = ipip6_fill_info,
1697 .dellink = ipip6_dellink,
1698 };
1699
1700 static struct xfrm_tunnel sit_handler __read_mostly = {
1701 .handler = ipip6_rcv,
1702 .err_handler = ipip6_err,
1703 .priority = 1,
1704 };
1705
1706 static struct xfrm_tunnel ipip_handler __read_mostly = {
1707 .handler = ipip_rcv,
1708 .err_handler = ipip6_err,
1709 .priority = 2,
1710 };
1711
1712 static void __net_exit sit_destroy_tunnels(struct net *net,
1713 struct list_head *head)
1714 {
1715 struct sit_net *sitn = net_generic(net, sit_net_id);
1716 struct net_device *dev, *aux;
1717 int prio;
1718
1719 for_each_netdev_safe(net, dev, aux)
1720 if (dev->rtnl_link_ops == &sit_link_ops)
1721 unregister_netdevice_queue(dev, head);
1722
1723 for (prio = 1; prio < 4; prio++) {
1724 int h;
1725 for (h = 0; h < HASH_SIZE; h++) {
1726 struct ip_tunnel *t;
1727
1728 t = rtnl_dereference(sitn->tunnels[prio][h]);
1729 while (t != NULL) {
1730 /* If dev is in the same netns, it has already
1731 * been added to the list by the previous loop.
1732 */
1733 if (!net_eq(dev_net(t->dev), net))
1734 unregister_netdevice_queue(t->dev,
1735 head);
1736 t = rtnl_dereference(t->next);
1737 }
1738 }
1739 }
1740 }
1741
1742 static int __net_init sit_init_net(struct net *net)
1743 {
1744 struct sit_net *sitn = net_generic(net, sit_net_id);
1745 struct ip_tunnel *t;
1746 int err;
1747
1748 sitn->tunnels[0] = sitn->tunnels_wc;
1749 sitn->tunnels[1] = sitn->tunnels_l;
1750 sitn->tunnels[2] = sitn->tunnels_r;
1751 sitn->tunnels[3] = sitn->tunnels_r_l;
1752
1753 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
1754 ipip6_tunnel_setup);
1755 if (!sitn->fb_tunnel_dev) {
1756 err = -ENOMEM;
1757 goto err_alloc_dev;
1758 }
1759 dev_net_set(sitn->fb_tunnel_dev, net);
1760 sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops;
1761 /* FB netdevice is special: we have one, and only one per netns.
1762 * Allowing to move it to another netns is clearly unsafe.
1763 */
1764 sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1765
1766 err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
1767 if (err)
1768 goto err_dev_free;
1769
1770 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
1771
1772 if ((err = register_netdev(sitn->fb_tunnel_dev)))
1773 goto err_reg_dev;
1774
1775 t = netdev_priv(sitn->fb_tunnel_dev);
1776
1777 strcpy(t->parms.name, sitn->fb_tunnel_dev->name);
1778 return 0;
1779
1780 err_reg_dev:
1781 dev_put(sitn->fb_tunnel_dev);
1782 err_dev_free:
1783 ipip6_dev_free(sitn->fb_tunnel_dev);
1784 err_alloc_dev:
1785 return err;
1786 }
1787
1788 static void __net_exit sit_exit_net(struct net *net)
1789 {
1790 LIST_HEAD(list);
1791
1792 rtnl_lock();
1793 sit_destroy_tunnels(net, &list);
1794 unregister_netdevice_many(&list);
1795 rtnl_unlock();
1796 }
1797
1798 static struct pernet_operations sit_net_ops = {
1799 .init = sit_init_net,
1800 .exit = sit_exit_net,
1801 .id = &sit_net_id,
1802 .size = sizeof(struct sit_net),
1803 };
1804
1805 static void __exit sit_cleanup(void)
1806 {
1807 rtnl_link_unregister(&sit_link_ops);
1808 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1809 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
1810
1811 unregister_pernet_device(&sit_net_ops);
1812 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1813 }
1814
1815 static int __init sit_init(void)
1816 {
1817 int err;
1818
1819 pr_info("IPv6 over IPv4 tunneling driver\n");
1820
1821 err = register_pernet_device(&sit_net_ops);
1822 if (err < 0)
1823 return err;
1824 err = xfrm4_tunnel_register(&sit_handler, AF_INET6);
1825 if (err < 0) {
1826 pr_info("%s: can't register ip6ip4\n", __func__);
1827 goto xfrm_tunnel_failed;
1828 }
1829 err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
1830 if (err < 0) {
1831 pr_info("%s: can't register ip4ip4\n", __func__);
1832 goto xfrm_tunnel4_failed;
1833 }
1834 err = rtnl_link_register(&sit_link_ops);
1835 if (err < 0)
1836 goto rtnl_link_failed;
1837
1838 out:
1839 return err;
1840
1841 rtnl_link_failed:
1842 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
1843 xfrm_tunnel4_failed:
1844 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1845 xfrm_tunnel_failed:
1846 unregister_pernet_device(&sit_net_ops);
1847 goto out;
1848 }
1849
1850 module_init(sit_init);
1851 module_exit(sit_cleanup);
1852 MODULE_LICENSE("GPL");
1853 MODULE_ALIAS_NETDEV("sit0");
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