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sit: add IPv4 over IPv4 support
[mirror_ubuntu-artful-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 net *net = dev_net(dev);
470 struct sit_net *sitn = net_generic(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, netdev_priv(dev));
476 ipip6_tunnel_del_prl(netdev_priv(dev), NULL);
477 }
478 dev_put(dev);
479 }
480
481
482 static int ipip6_err(struct sk_buff *skb, u32 info)
483 {
484
485 /* All the routers (except for Linux) return only
486 8 bytes of packet payload. It means, that precise relaying of
487 ICMP in the real Internet is absolutely infeasible.
488 */
489 const struct iphdr *iph = (const struct iphdr *)skb->data;
490 const int type = icmp_hdr(skb)->type;
491 const int code = icmp_hdr(skb)->code;
492 struct ip_tunnel *t;
493 int err;
494
495 switch (type) {
496 default:
497 case ICMP_PARAMETERPROB:
498 return 0;
499
500 case ICMP_DEST_UNREACH:
501 switch (code) {
502 case ICMP_SR_FAILED:
503 case ICMP_PORT_UNREACH:
504 /* Impossible event. */
505 return 0;
506 default:
507 /* All others are translated to HOST_UNREACH.
508 rfc2003 contains "deep thoughts" about NET_UNREACH,
509 I believe they are just ether pollution. --ANK
510 */
511 break;
512 }
513 break;
514 case ICMP_TIME_EXCEEDED:
515 if (code != ICMP_EXC_TTL)
516 return 0;
517 break;
518 case ICMP_REDIRECT:
519 break;
520 }
521
522 err = -ENOENT;
523
524 t = ipip6_tunnel_lookup(dev_net(skb->dev),
525 skb->dev,
526 iph->daddr,
527 iph->saddr);
528 if (t == NULL)
529 goto out;
530
531 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
532 ipv4_update_pmtu(skb, dev_net(skb->dev), info,
533 t->dev->ifindex, 0, IPPROTO_IPV6, 0);
534 err = 0;
535 goto out;
536 }
537 if (type == ICMP_REDIRECT) {
538 ipv4_redirect(skb, dev_net(skb->dev), t->dev->ifindex, 0,
539 IPPROTO_IPV6, 0);
540 err = 0;
541 goto out;
542 }
543
544 if (t->parms.iph.daddr == 0)
545 goto out;
546
547 err = 0;
548 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
549 goto out;
550
551 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
552 t->err_count++;
553 else
554 t->err_count = 1;
555 t->err_time = jiffies;
556 out:
557 return err;
558 }
559
560 static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr,
561 const struct in6_addr *v6addr)
562 {
563 __be32 v4embed = 0;
564 if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed)
565 return true;
566 return false;
567 }
568
569 static int ipip6_rcv(struct sk_buff *skb)
570 {
571 const struct iphdr *iph = ip_hdr(skb);
572 struct ip_tunnel *tunnel;
573 int err;
574
575 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
576 iph->saddr, iph->daddr);
577 if (tunnel != NULL) {
578 struct pcpu_tstats *tstats;
579
580 if (tunnel->parms.iph.protocol != IPPROTO_IPV6 &&
581 tunnel->parms.iph.protocol != 0)
582 goto out;
583
584 secpath_reset(skb);
585 skb->mac_header = skb->network_header;
586 skb_reset_network_header(skb);
587 IPCB(skb)->flags = 0;
588 skb->protocol = htons(ETH_P_IPV6);
589 skb->pkt_type = PACKET_HOST;
590
591 if (tunnel->dev->priv_flags & IFF_ISATAP) {
592 if (!isatap_chksrc(skb, iph, tunnel)) {
593 tunnel->dev->stats.rx_errors++;
594 goto out;
595 }
596 } else {
597 if (is_spoofed_6rd(tunnel, iph->saddr,
598 &ipv6_hdr(skb)->saddr) ||
599 is_spoofed_6rd(tunnel, iph->daddr,
600 &ipv6_hdr(skb)->daddr)) {
601 tunnel->dev->stats.rx_errors++;
602 goto out;
603 }
604 }
605
606 __skb_tunnel_rx(skb, tunnel->dev);
607
608 err = IP_ECN_decapsulate(iph, skb);
609 if (unlikely(err)) {
610 if (log_ecn_error)
611 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
612 &iph->saddr, iph->tos);
613 if (err > 1) {
614 ++tunnel->dev->stats.rx_frame_errors;
615 ++tunnel->dev->stats.rx_errors;
616 goto out;
617 }
618 }
619
620 tstats = this_cpu_ptr(tunnel->dev->tstats);
621 tstats->rx_packets++;
622 tstats->rx_bytes += skb->len;
623
624 netif_rx(skb);
625
626 return 0;
627 }
628
629 /* no tunnel matched, let upstream know, ipsec may handle it */
630 return 1;
631 out:
632 kfree_skb(skb);
633 return 0;
634 }
635
636 static const struct tnl_ptk_info tpi = {
637 /* no tunnel info required for ipip. */
638 .proto = htons(ETH_P_IP),
639 };
640
641 static int ipip_rcv(struct sk_buff *skb)
642 {
643 const struct iphdr *iph = ip_hdr(skb);
644 struct ip_tunnel *tunnel;
645
646 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
647 iph->saddr, iph->daddr);
648 if (tunnel != NULL) {
649 if (tunnel->parms.iph.protocol != IPPROTO_IPIP &&
650 tunnel->parms.iph.protocol != 0)
651 goto drop;
652
653 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
654 goto drop;
655 return ip_tunnel_rcv(tunnel, skb, &tpi, log_ecn_error);
656 }
657
658 return 1;
659
660 drop:
661 kfree_skb(skb);
662 return 0;
663 }
664
665 /*
666 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function
667 * stores the embedded IPv4 address in v4dst and returns true.
668 */
669 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
670 __be32 *v4dst)
671 {
672 #ifdef CONFIG_IPV6_SIT_6RD
673 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix,
674 tunnel->ip6rd.prefixlen)) {
675 unsigned int pbw0, pbi0;
676 int pbi1;
677 u32 d;
678
679 pbw0 = tunnel->ip6rd.prefixlen >> 5;
680 pbi0 = tunnel->ip6rd.prefixlen & 0x1f;
681
682 d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
683 tunnel->ip6rd.relay_prefixlen;
684
685 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;
686 if (pbi1 > 0)
687 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >>
688 (32 - pbi1);
689
690 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d);
691 return true;
692 }
693 #else
694 if (v6dst->s6_addr16[0] == htons(0x2002)) {
695 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
696 memcpy(v4dst, &v6dst->s6_addr16[1], 4);
697 return true;
698 }
699 #endif
700 return false;
701 }
702
703 static inline __be32 try_6rd(struct ip_tunnel *tunnel,
704 const struct in6_addr *v6dst)
705 {
706 __be32 dst = 0;
707 check_6rd(tunnel, v6dst, &dst);
708 return dst;
709 }
710
711 /*
712 * This function assumes it is being called from dev_queue_xmit()
713 * and that skb is filled properly by that function.
714 */
715
716 static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
717 struct net_device *dev)
718 {
719 struct ip_tunnel *tunnel = netdev_priv(dev);
720 const struct iphdr *tiph = &tunnel->parms.iph;
721 const struct ipv6hdr *iph6 = ipv6_hdr(skb);
722 u8 tos = tunnel->parms.iph.tos;
723 __be16 df = tiph->frag_off;
724 struct rtable *rt; /* Route to the other host */
725 struct net_device *tdev; /* Device to other host */
726 struct iphdr *iph; /* Our new IP header */
727 unsigned int max_headroom; /* The extra header space needed */
728 __be32 dst = tiph->daddr;
729 struct flowi4 fl4;
730 int mtu;
731 const struct in6_addr *addr6;
732 int addr_type;
733
734 if (skb->protocol != htons(ETH_P_IPV6))
735 goto tx_error;
736
737 if (tos == 1)
738 tos = ipv6_get_dsfield(iph6);
739
740 /* ISATAP (RFC4214) - must come before 6to4 */
741 if (dev->priv_flags & IFF_ISATAP) {
742 struct neighbour *neigh = NULL;
743 bool do_tx_error = false;
744
745 if (skb_dst(skb))
746 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
747
748 if (neigh == NULL) {
749 net_dbg_ratelimited("sit: nexthop == NULL\n");
750 goto tx_error;
751 }
752
753 addr6 = (const struct in6_addr *)&neigh->primary_key;
754 addr_type = ipv6_addr_type(addr6);
755
756 if ((addr_type & IPV6_ADDR_UNICAST) &&
757 ipv6_addr_is_isatap(addr6))
758 dst = addr6->s6_addr32[3];
759 else
760 do_tx_error = true;
761
762 neigh_release(neigh);
763 if (do_tx_error)
764 goto tx_error;
765 }
766
767 if (!dst)
768 dst = try_6rd(tunnel, &iph6->daddr);
769
770 if (!dst) {
771 struct neighbour *neigh = NULL;
772 bool do_tx_error = false;
773
774 if (skb_dst(skb))
775 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
776
777 if (neigh == NULL) {
778 net_dbg_ratelimited("sit: nexthop == NULL\n");
779 goto tx_error;
780 }
781
782 addr6 = (const struct in6_addr *)&neigh->primary_key;
783 addr_type = ipv6_addr_type(addr6);
784
785 if (addr_type == IPV6_ADDR_ANY) {
786 addr6 = &ipv6_hdr(skb)->daddr;
787 addr_type = ipv6_addr_type(addr6);
788 }
789
790 if ((addr_type & IPV6_ADDR_COMPATv4) != 0)
791 dst = addr6->s6_addr32[3];
792 else
793 do_tx_error = true;
794
795 neigh_release(neigh);
796 if (do_tx_error)
797 goto tx_error;
798 }
799
800 rt = ip_route_output_ports(dev_net(dev), &fl4, NULL,
801 dst, tiph->saddr,
802 0, 0,
803 IPPROTO_IPV6, RT_TOS(tos),
804 tunnel->parms.link);
805 if (IS_ERR(rt)) {
806 dev->stats.tx_carrier_errors++;
807 goto tx_error_icmp;
808 }
809 if (rt->rt_type != RTN_UNICAST) {
810 ip_rt_put(rt);
811 dev->stats.tx_carrier_errors++;
812 goto tx_error_icmp;
813 }
814 tdev = rt->dst.dev;
815
816 if (tdev == dev) {
817 ip_rt_put(rt);
818 dev->stats.collisions++;
819 goto tx_error;
820 }
821
822 if (df) {
823 mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr);
824
825 if (mtu < 68) {
826 dev->stats.collisions++;
827 ip_rt_put(rt);
828 goto tx_error;
829 }
830
831 if (mtu < IPV6_MIN_MTU) {
832 mtu = IPV6_MIN_MTU;
833 df = 0;
834 }
835
836 if (tunnel->parms.iph.daddr && skb_dst(skb))
837 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
838
839 if (skb->len > mtu) {
840 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
841 ip_rt_put(rt);
842 goto tx_error;
843 }
844 }
845
846 if (tunnel->err_count > 0) {
847 if (time_before(jiffies,
848 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
849 tunnel->err_count--;
850 dst_link_failure(skb);
851 } else
852 tunnel->err_count = 0;
853 }
854
855 /*
856 * Okay, now see if we can stuff it in the buffer as-is.
857 */
858 max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr);
859
860 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
861 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
862 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
863 if (!new_skb) {
864 ip_rt_put(rt);
865 dev->stats.tx_dropped++;
866 dev_kfree_skb(skb);
867 return NETDEV_TX_OK;
868 }
869 if (skb->sk)
870 skb_set_owner_w(new_skb, skb->sk);
871 dev_kfree_skb(skb);
872 skb = new_skb;
873 iph6 = ipv6_hdr(skb);
874 }
875
876 skb->transport_header = skb->network_header;
877 skb_push(skb, sizeof(struct iphdr));
878 skb_reset_network_header(skb);
879 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
880 IPCB(skb)->flags = 0;
881 skb_dst_drop(skb);
882 skb_dst_set(skb, &rt->dst);
883
884 /*
885 * Push down and install the IPIP header.
886 */
887
888 iph = ip_hdr(skb);
889 iph->version = 4;
890 iph->ihl = sizeof(struct iphdr)>>2;
891 iph->frag_off = df;
892 iph->protocol = IPPROTO_IPV6;
893 iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
894 iph->daddr = fl4.daddr;
895 iph->saddr = fl4.saddr;
896
897 if ((iph->ttl = tiph->ttl) == 0)
898 iph->ttl = iph6->hop_limit;
899
900 skb->ip_summed = CHECKSUM_NONE;
901 ip_select_ident(iph, skb_dst(skb), NULL);
902 iptunnel_xmit(skb, dev);
903 return NETDEV_TX_OK;
904
905 tx_error_icmp:
906 dst_link_failure(skb);
907 tx_error:
908 dev->stats.tx_errors++;
909 dev_kfree_skb(skb);
910 return NETDEV_TX_OK;
911 }
912
913 static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
914 {
915 struct ip_tunnel *tunnel = netdev_priv(dev);
916 const struct iphdr *tiph = &tunnel->parms.iph;
917
918 if (likely(!skb->encapsulation)) {
919 skb_reset_inner_headers(skb);
920 skb->encapsulation = 1;
921 }
922
923 ip_tunnel_xmit(skb, dev, tiph, IPPROTO_IPIP);
924 return NETDEV_TX_OK;
925 }
926
927 static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb,
928 struct net_device *dev)
929 {
930 switch (skb->protocol) {
931 case htons(ETH_P_IP):
932 ipip_tunnel_xmit(skb, dev);
933 break;
934 case htons(ETH_P_IPV6):
935 ipip6_tunnel_xmit(skb, dev);
936 break;
937 default:
938 goto tx_err;
939 }
940
941 return NETDEV_TX_OK;
942
943 tx_err:
944 dev->stats.tx_errors++;
945 dev_kfree_skb(skb);
946 return NETDEV_TX_OK;
947
948 }
949
950 static void ipip6_tunnel_bind_dev(struct net_device *dev)
951 {
952 struct net_device *tdev = NULL;
953 struct ip_tunnel *tunnel;
954 const struct iphdr *iph;
955 struct flowi4 fl4;
956
957 tunnel = netdev_priv(dev);
958 iph = &tunnel->parms.iph;
959
960 if (iph->daddr) {
961 struct rtable *rt = ip_route_output_ports(dev_net(dev), &fl4, NULL,
962 iph->daddr, iph->saddr,
963 0, 0,
964 IPPROTO_IPV6,
965 RT_TOS(iph->tos),
966 tunnel->parms.link);
967
968 if (!IS_ERR(rt)) {
969 tdev = rt->dst.dev;
970 ip_rt_put(rt);
971 }
972 dev->flags |= IFF_POINTOPOINT;
973 }
974
975 if (!tdev && tunnel->parms.link)
976 tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
977
978 if (tdev) {
979 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
980 dev->mtu = tdev->mtu - sizeof(struct iphdr);
981 if (dev->mtu < IPV6_MIN_MTU)
982 dev->mtu = IPV6_MIN_MTU;
983 }
984 dev->iflink = tunnel->parms.link;
985 }
986
987 static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p)
988 {
989 struct net *net = dev_net(t->dev);
990 struct sit_net *sitn = net_generic(net, sit_net_id);
991
992 ipip6_tunnel_unlink(sitn, t);
993 synchronize_net();
994 t->parms.iph.saddr = p->iph.saddr;
995 t->parms.iph.daddr = p->iph.daddr;
996 memcpy(t->dev->dev_addr, &p->iph.saddr, 4);
997 memcpy(t->dev->broadcast, &p->iph.daddr, 4);
998 ipip6_tunnel_link(sitn, t);
999 t->parms.iph.ttl = p->iph.ttl;
1000 t->parms.iph.tos = p->iph.tos;
1001 if (t->parms.link != p->link) {
1002 t->parms.link = p->link;
1003 ipip6_tunnel_bind_dev(t->dev);
1004 }
1005 netdev_state_change(t->dev);
1006 }
1007
1008 #ifdef CONFIG_IPV6_SIT_6RD
1009 static int ipip6_tunnel_update_6rd(struct ip_tunnel *t,
1010 struct ip_tunnel_6rd *ip6rd)
1011 {
1012 struct in6_addr prefix;
1013 __be32 relay_prefix;
1014
1015 if (ip6rd->relay_prefixlen > 32 ||
1016 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64)
1017 return -EINVAL;
1018
1019 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen);
1020 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix))
1021 return -EINVAL;
1022 if (ip6rd->relay_prefixlen)
1023 relay_prefix = ip6rd->relay_prefix &
1024 htonl(0xffffffffUL <<
1025 (32 - ip6rd->relay_prefixlen));
1026 else
1027 relay_prefix = 0;
1028 if (relay_prefix != ip6rd->relay_prefix)
1029 return -EINVAL;
1030
1031 t->ip6rd.prefix = prefix;
1032 t->ip6rd.relay_prefix = relay_prefix;
1033 t->ip6rd.prefixlen = ip6rd->prefixlen;
1034 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen;
1035 netdev_state_change(t->dev);
1036 return 0;
1037 }
1038 #endif
1039
1040 static int
1041 ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
1042 {
1043 int err = 0;
1044 struct ip_tunnel_parm p;
1045 struct ip_tunnel_prl prl;
1046 struct ip_tunnel *t;
1047 struct net *net = dev_net(dev);
1048 struct sit_net *sitn = net_generic(net, sit_net_id);
1049 #ifdef CONFIG_IPV6_SIT_6RD
1050 struct ip_tunnel_6rd ip6rd;
1051 #endif
1052
1053 switch (cmd) {
1054 case SIOCGETTUNNEL:
1055 #ifdef CONFIG_IPV6_SIT_6RD
1056 case SIOCGET6RD:
1057 #endif
1058 t = NULL;
1059 if (dev == sitn->fb_tunnel_dev) {
1060 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1061 err = -EFAULT;
1062 break;
1063 }
1064 t = ipip6_tunnel_locate(net, &p, 0);
1065 }
1066 if (t == NULL)
1067 t = netdev_priv(dev);
1068
1069 err = -EFAULT;
1070 if (cmd == SIOCGETTUNNEL) {
1071 memcpy(&p, &t->parms, sizeof(p));
1072 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p,
1073 sizeof(p)))
1074 goto done;
1075 #ifdef CONFIG_IPV6_SIT_6RD
1076 } else {
1077 ip6rd.prefix = t->ip6rd.prefix;
1078 ip6rd.relay_prefix = t->ip6rd.relay_prefix;
1079 ip6rd.prefixlen = t->ip6rd.prefixlen;
1080 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;
1081 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd,
1082 sizeof(ip6rd)))
1083 goto done;
1084 #endif
1085 }
1086 err = 0;
1087 break;
1088
1089 case SIOCADDTUNNEL:
1090 case SIOCCHGTUNNEL:
1091 err = -EPERM;
1092 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1093 goto done;
1094
1095 err = -EFAULT;
1096 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1097 goto done;
1098
1099 err = -EINVAL;
1100 if (p.iph.protocol != IPPROTO_IPV6 &&
1101 p.iph.protocol != IPPROTO_IPIP &&
1102 p.iph.protocol != 0)
1103 goto done;
1104 if (p.iph.version != 4 ||
1105 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
1106 goto done;
1107 if (p.iph.ttl)
1108 p.iph.frag_off |= htons(IP_DF);
1109
1110 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
1111
1112 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1113 if (t != NULL) {
1114 if (t->dev != dev) {
1115 err = -EEXIST;
1116 break;
1117 }
1118 } else {
1119 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
1120 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
1121 err = -EINVAL;
1122 break;
1123 }
1124 t = netdev_priv(dev);
1125 }
1126
1127 ipip6_tunnel_update(t, &p);
1128 }
1129
1130 if (t) {
1131 err = 0;
1132 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
1133 err = -EFAULT;
1134 } else
1135 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1136 break;
1137
1138 case SIOCDELTUNNEL:
1139 err = -EPERM;
1140 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1141 goto done;
1142
1143 if (dev == sitn->fb_tunnel_dev) {
1144 err = -EFAULT;
1145 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1146 goto done;
1147 err = -ENOENT;
1148 if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL)
1149 goto done;
1150 err = -EPERM;
1151 if (t == netdev_priv(sitn->fb_tunnel_dev))
1152 goto done;
1153 dev = t->dev;
1154 }
1155 unregister_netdevice(dev);
1156 err = 0;
1157 break;
1158
1159 case SIOCGETPRL:
1160 err = -EINVAL;
1161 if (dev == sitn->fb_tunnel_dev)
1162 goto done;
1163 err = -ENOENT;
1164 if (!(t = netdev_priv(dev)))
1165 goto done;
1166 err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data);
1167 break;
1168
1169 case SIOCADDPRL:
1170 case SIOCDELPRL:
1171 case SIOCCHGPRL:
1172 err = -EPERM;
1173 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1174 goto done;
1175 err = -EINVAL;
1176 if (dev == sitn->fb_tunnel_dev)
1177 goto done;
1178 err = -EFAULT;
1179 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
1180 goto done;
1181 err = -ENOENT;
1182 if (!(t = netdev_priv(dev)))
1183 goto done;
1184
1185 switch (cmd) {
1186 case SIOCDELPRL:
1187 err = ipip6_tunnel_del_prl(t, &prl);
1188 break;
1189 case SIOCADDPRL:
1190 case SIOCCHGPRL:
1191 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
1192 break;
1193 }
1194 netdev_state_change(dev);
1195 break;
1196
1197 #ifdef CONFIG_IPV6_SIT_6RD
1198 case SIOCADD6RD:
1199 case SIOCCHG6RD:
1200 case SIOCDEL6RD:
1201 err = -EPERM;
1202 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1203 goto done;
1204
1205 err = -EFAULT;
1206 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data,
1207 sizeof(ip6rd)))
1208 goto done;
1209
1210 t = netdev_priv(dev);
1211
1212 if (cmd != SIOCDEL6RD) {
1213 err = ipip6_tunnel_update_6rd(t, &ip6rd);
1214 if (err < 0)
1215 goto done;
1216 } else
1217 ipip6_tunnel_clone_6rd(dev, sitn);
1218
1219 err = 0;
1220 break;
1221 #endif
1222
1223 default:
1224 err = -EINVAL;
1225 }
1226
1227 done:
1228 return err;
1229 }
1230
1231 static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1232 {
1233 if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr))
1234 return -EINVAL;
1235 dev->mtu = new_mtu;
1236 return 0;
1237 }
1238
1239 static const struct net_device_ops ipip6_netdev_ops = {
1240 .ndo_uninit = ipip6_tunnel_uninit,
1241 .ndo_start_xmit = sit_tunnel_xmit,
1242 .ndo_do_ioctl = ipip6_tunnel_ioctl,
1243 .ndo_change_mtu = ipip6_tunnel_change_mtu,
1244 .ndo_get_stats64 = ip_tunnel_get_stats64,
1245 };
1246
1247 static void ipip6_dev_free(struct net_device *dev)
1248 {
1249 free_percpu(dev->tstats);
1250 free_netdev(dev);
1251 }
1252
1253 static void ipip6_tunnel_setup(struct net_device *dev)
1254 {
1255 dev->netdev_ops = &ipip6_netdev_ops;
1256 dev->destructor = ipip6_dev_free;
1257
1258 dev->type = ARPHRD_SIT;
1259 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
1260 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr);
1261 dev->flags = IFF_NOARP;
1262 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1263 dev->iflink = 0;
1264 dev->addr_len = 4;
1265 dev->features |= NETIF_F_NETNS_LOCAL;
1266 dev->features |= NETIF_F_LLTX;
1267 }
1268
1269 static int ipip6_tunnel_init(struct net_device *dev)
1270 {
1271 struct ip_tunnel *tunnel = netdev_priv(dev);
1272
1273 tunnel->dev = dev;
1274
1275 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
1276 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
1277
1278 ipip6_tunnel_bind_dev(dev);
1279 dev->tstats = alloc_percpu(struct pcpu_tstats);
1280 if (!dev->tstats)
1281 return -ENOMEM;
1282
1283 return 0;
1284 }
1285
1286 static int __net_init ipip6_fb_tunnel_init(struct net_device *dev)
1287 {
1288 struct ip_tunnel *tunnel = netdev_priv(dev);
1289 struct iphdr *iph = &tunnel->parms.iph;
1290 struct net *net = dev_net(dev);
1291 struct sit_net *sitn = net_generic(net, sit_net_id);
1292
1293 tunnel->dev = dev;
1294 strcpy(tunnel->parms.name, dev->name);
1295
1296 iph->version = 4;
1297 iph->protocol = IPPROTO_IPV6;
1298 iph->ihl = 5;
1299 iph->ttl = 64;
1300
1301 dev->tstats = alloc_percpu(struct pcpu_tstats);
1302 if (!dev->tstats)
1303 return -ENOMEM;
1304 dev_hold(dev);
1305 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel);
1306 return 0;
1307 }
1308
1309 static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[])
1310 {
1311 u8 proto;
1312
1313 if (!data)
1314 return 0;
1315
1316 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1317 if (proto != IPPROTO_IPV6 &&
1318 proto != IPPROTO_IPIP &&
1319 proto != 0)
1320 return -EINVAL;
1321
1322 return 0;
1323 }
1324
1325 static void ipip6_netlink_parms(struct nlattr *data[],
1326 struct ip_tunnel_parm *parms)
1327 {
1328 memset(parms, 0, sizeof(*parms));
1329
1330 parms->iph.version = 4;
1331 parms->iph.protocol = IPPROTO_IPV6;
1332 parms->iph.ihl = 5;
1333 parms->iph.ttl = 64;
1334
1335 if (!data)
1336 return;
1337
1338 if (data[IFLA_IPTUN_LINK])
1339 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1340
1341 if (data[IFLA_IPTUN_LOCAL])
1342 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]);
1343
1344 if (data[IFLA_IPTUN_REMOTE])
1345 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]);
1346
1347 if (data[IFLA_IPTUN_TTL]) {
1348 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
1349 if (parms->iph.ttl)
1350 parms->iph.frag_off = htons(IP_DF);
1351 }
1352
1353 if (data[IFLA_IPTUN_TOS])
1354 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
1355
1356 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
1357 parms->iph.frag_off = htons(IP_DF);
1358
1359 if (data[IFLA_IPTUN_FLAGS])
1360 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]);
1361
1362 if (data[IFLA_IPTUN_PROTO])
1363 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1364
1365 }
1366
1367 #ifdef CONFIG_IPV6_SIT_6RD
1368 /* This function returns true when 6RD attributes are present in the nl msg */
1369 static bool ipip6_netlink_6rd_parms(struct nlattr *data[],
1370 struct ip_tunnel_6rd *ip6rd)
1371 {
1372 bool ret = false;
1373 memset(ip6rd, 0, sizeof(*ip6rd));
1374
1375 if (!data)
1376 return ret;
1377
1378 if (data[IFLA_IPTUN_6RD_PREFIX]) {
1379 ret = true;
1380 nla_memcpy(&ip6rd->prefix, data[IFLA_IPTUN_6RD_PREFIX],
1381 sizeof(struct in6_addr));
1382 }
1383
1384 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) {
1385 ret = true;
1386 ip6rd->relay_prefix =
1387 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]);
1388 }
1389
1390 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) {
1391 ret = true;
1392 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]);
1393 }
1394
1395 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) {
1396 ret = true;
1397 ip6rd->relay_prefixlen =
1398 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
1399 }
1400
1401 return ret;
1402 }
1403 #endif
1404
1405 static int ipip6_newlink(struct net *src_net, struct net_device *dev,
1406 struct nlattr *tb[], struct nlattr *data[])
1407 {
1408 struct net *net = dev_net(dev);
1409 struct ip_tunnel *nt;
1410 #ifdef CONFIG_IPV6_SIT_6RD
1411 struct ip_tunnel_6rd ip6rd;
1412 #endif
1413 int err;
1414
1415 nt = netdev_priv(dev);
1416 ipip6_netlink_parms(data, &nt->parms);
1417
1418 if (ipip6_tunnel_locate(net, &nt->parms, 0))
1419 return -EEXIST;
1420
1421 err = ipip6_tunnel_create(dev);
1422 if (err < 0)
1423 return err;
1424
1425 #ifdef CONFIG_IPV6_SIT_6RD
1426 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1427 err = ipip6_tunnel_update_6rd(nt, &ip6rd);
1428 #endif
1429
1430 return err;
1431 }
1432
1433 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[],
1434 struct nlattr *data[])
1435 {
1436 struct ip_tunnel *t;
1437 struct ip_tunnel_parm p;
1438 struct net *net = dev_net(dev);
1439 struct sit_net *sitn = net_generic(net, sit_net_id);
1440 #ifdef CONFIG_IPV6_SIT_6RD
1441 struct ip_tunnel_6rd ip6rd;
1442 #endif
1443
1444 if (dev == sitn->fb_tunnel_dev)
1445 return -EINVAL;
1446
1447 ipip6_netlink_parms(data, &p);
1448
1449 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
1450 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
1451 return -EINVAL;
1452
1453 t = ipip6_tunnel_locate(net, &p, 0);
1454
1455 if (t) {
1456 if (t->dev != dev)
1457 return -EEXIST;
1458 } else
1459 t = netdev_priv(dev);
1460
1461 ipip6_tunnel_update(t, &p);
1462
1463 #ifdef CONFIG_IPV6_SIT_6RD
1464 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1465 return ipip6_tunnel_update_6rd(t, &ip6rd);
1466 #endif
1467
1468 return 0;
1469 }
1470
1471 static size_t ipip6_get_size(const struct net_device *dev)
1472 {
1473 return
1474 /* IFLA_IPTUN_LINK */
1475 nla_total_size(4) +
1476 /* IFLA_IPTUN_LOCAL */
1477 nla_total_size(4) +
1478 /* IFLA_IPTUN_REMOTE */
1479 nla_total_size(4) +
1480 /* IFLA_IPTUN_TTL */
1481 nla_total_size(1) +
1482 /* IFLA_IPTUN_TOS */
1483 nla_total_size(1) +
1484 /* IFLA_IPTUN_PMTUDISC */
1485 nla_total_size(1) +
1486 /* IFLA_IPTUN_FLAGS */
1487 nla_total_size(2) +
1488 /* IFLA_IPTUN_PROTO */
1489 nla_total_size(1) +
1490 #ifdef CONFIG_IPV6_SIT_6RD
1491 /* IFLA_IPTUN_6RD_PREFIX */
1492 nla_total_size(sizeof(struct in6_addr)) +
1493 /* IFLA_IPTUN_6RD_RELAY_PREFIX */
1494 nla_total_size(4) +
1495 /* IFLA_IPTUN_6RD_PREFIXLEN */
1496 nla_total_size(2) +
1497 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */
1498 nla_total_size(2) +
1499 #endif
1500 0;
1501 }
1502
1503 static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1504 {
1505 struct ip_tunnel *tunnel = netdev_priv(dev);
1506 struct ip_tunnel_parm *parm = &tunnel->parms;
1507
1508 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
1509 nla_put_be32(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
1510 nla_put_be32(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
1511 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
1512 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
1513 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
1514 !!(parm->iph.frag_off & htons(IP_DF))) ||
1515 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
1516 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags))
1517 goto nla_put_failure;
1518
1519 #ifdef CONFIG_IPV6_SIT_6RD
1520 if (nla_put(skb, IFLA_IPTUN_6RD_PREFIX, sizeof(struct in6_addr),
1521 &tunnel->ip6rd.prefix) ||
1522 nla_put_be32(skb, IFLA_IPTUN_6RD_RELAY_PREFIX,
1523 tunnel->ip6rd.relay_prefix) ||
1524 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN,
1525 tunnel->ip6rd.prefixlen) ||
1526 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
1527 tunnel->ip6rd.relay_prefixlen))
1528 goto nla_put_failure;
1529 #endif
1530
1531 return 0;
1532
1533 nla_put_failure:
1534 return -EMSGSIZE;
1535 }
1536
1537 static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = {
1538 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1539 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 },
1540 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 },
1541 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1542 [IFLA_IPTUN_TOS] = { .type = NLA_U8 },
1543 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 },
1544 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 },
1545 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
1546 #ifdef CONFIG_IPV6_SIT_6RD
1547 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) },
1548 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 },
1549 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 },
1550 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 },
1551 #endif
1552 };
1553
1554 static struct rtnl_link_ops sit_link_ops __read_mostly = {
1555 .kind = "sit",
1556 .maxtype = IFLA_IPTUN_MAX,
1557 .policy = ipip6_policy,
1558 .priv_size = sizeof(struct ip_tunnel),
1559 .setup = ipip6_tunnel_setup,
1560 .validate = ipip6_validate,
1561 .newlink = ipip6_newlink,
1562 .changelink = ipip6_changelink,
1563 .get_size = ipip6_get_size,
1564 .fill_info = ipip6_fill_info,
1565 };
1566
1567 static struct xfrm_tunnel sit_handler __read_mostly = {
1568 .handler = ipip6_rcv,
1569 .err_handler = ipip6_err,
1570 .priority = 1,
1571 };
1572
1573 static struct xfrm_tunnel ipip_handler __read_mostly = {
1574 .handler = ipip_rcv,
1575 .err_handler = ipip6_err,
1576 .priority = 2,
1577 };
1578
1579 static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head)
1580 {
1581 int prio;
1582
1583 for (prio = 1; prio < 4; prio++) {
1584 int h;
1585 for (h = 0; h < HASH_SIZE; h++) {
1586 struct ip_tunnel *t;
1587
1588 t = rtnl_dereference(sitn->tunnels[prio][h]);
1589 while (t != NULL) {
1590 unregister_netdevice_queue(t->dev, head);
1591 t = rtnl_dereference(t->next);
1592 }
1593 }
1594 }
1595 }
1596
1597 static int __net_init sit_init_net(struct net *net)
1598 {
1599 struct sit_net *sitn = net_generic(net, sit_net_id);
1600 struct ip_tunnel *t;
1601 int err;
1602
1603 sitn->tunnels[0] = sitn->tunnels_wc;
1604 sitn->tunnels[1] = sitn->tunnels_l;
1605 sitn->tunnels[2] = sitn->tunnels_r;
1606 sitn->tunnels[3] = sitn->tunnels_r_l;
1607
1608 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
1609 ipip6_tunnel_setup);
1610 if (!sitn->fb_tunnel_dev) {
1611 err = -ENOMEM;
1612 goto err_alloc_dev;
1613 }
1614 dev_net_set(sitn->fb_tunnel_dev, net);
1615
1616 err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
1617 if (err)
1618 goto err_dev_free;
1619
1620 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
1621
1622 if ((err = register_netdev(sitn->fb_tunnel_dev)))
1623 goto err_reg_dev;
1624
1625 t = netdev_priv(sitn->fb_tunnel_dev);
1626
1627 strcpy(t->parms.name, sitn->fb_tunnel_dev->name);
1628 return 0;
1629
1630 err_reg_dev:
1631 dev_put(sitn->fb_tunnel_dev);
1632 err_dev_free:
1633 ipip6_dev_free(sitn->fb_tunnel_dev);
1634 err_alloc_dev:
1635 return err;
1636 }
1637
1638 static void __net_exit sit_exit_net(struct net *net)
1639 {
1640 struct sit_net *sitn = net_generic(net, sit_net_id);
1641 LIST_HEAD(list);
1642
1643 rtnl_lock();
1644 sit_destroy_tunnels(sitn, &list);
1645 unregister_netdevice_queue(sitn->fb_tunnel_dev, &list);
1646 unregister_netdevice_many(&list);
1647 rtnl_unlock();
1648 }
1649
1650 static struct pernet_operations sit_net_ops = {
1651 .init = sit_init_net,
1652 .exit = sit_exit_net,
1653 .id = &sit_net_id,
1654 .size = sizeof(struct sit_net),
1655 };
1656
1657 static void __exit sit_cleanup(void)
1658 {
1659 rtnl_link_unregister(&sit_link_ops);
1660 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1661 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
1662
1663 unregister_pernet_device(&sit_net_ops);
1664 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1665 }
1666
1667 static int __init sit_init(void)
1668 {
1669 int err;
1670
1671 pr_info("IPv6 over IPv4 tunneling driver\n");
1672
1673 err = register_pernet_device(&sit_net_ops);
1674 if (err < 0)
1675 return err;
1676 err = xfrm4_tunnel_register(&sit_handler, AF_INET6);
1677 if (err < 0) {
1678 pr_info("%s: can't register ip6ip4\n", __func__);
1679 goto xfrm_tunnel_failed;
1680 }
1681 err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
1682 if (err < 0) {
1683 pr_info("%s: can't register ip4ip4\n", __func__);
1684 goto xfrm_tunnel4_failed;
1685 }
1686 err = rtnl_link_register(&sit_link_ops);
1687 if (err < 0)
1688 goto rtnl_link_failed;
1689
1690 out:
1691 return err;
1692
1693 rtnl_link_failed:
1694 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
1695 xfrm_tunnel4_failed:
1696 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1697 xfrm_tunnel_failed:
1698 unregister_pernet_device(&sit_net_ops);
1699 goto out;
1700 }
1701
1702 module_init(sit_init);
1703 module_exit(sit_cleanup);
1704 MODULE_LICENSE("GPL");
1705 MODULE_ALIAS_NETDEV("sit0");
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