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net: Allow userns root to control ipv6
[deliverable/linux.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/ipip.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 int ipip6_tunnel_init(struct net_device *dev);
69 static void ipip6_tunnel_setup(struct net_device *dev);
70 static void ipip6_dev_free(struct net_device *dev);
71 static struct rtnl_link_ops sit_link_ops __read_mostly;
72
73 static int sit_net_id __read_mostly;
74 struct sit_net {
75 struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE];
76 struct ip_tunnel __rcu *tunnels_r[HASH_SIZE];
77 struct ip_tunnel __rcu *tunnels_l[HASH_SIZE];
78 struct ip_tunnel __rcu *tunnels_wc[1];
79 struct ip_tunnel __rcu **tunnels[4];
80
81 struct net_device *fb_tunnel_dev;
82 };
83
84 static struct rtnl_link_stats64 *ipip6_get_stats64(struct net_device *dev,
85 struct rtnl_link_stats64 *tot)
86 {
87 int i;
88
89 for_each_possible_cpu(i) {
90 const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
91 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
92 unsigned int start;
93
94 do {
95 start = u64_stats_fetch_begin_bh(&tstats->syncp);
96 rx_packets = tstats->rx_packets;
97 tx_packets = tstats->tx_packets;
98 rx_bytes = tstats->rx_bytes;
99 tx_bytes = tstats->tx_bytes;
100 } while (u64_stats_fetch_retry_bh(&tstats->syncp, start));
101
102 tot->rx_packets += rx_packets;
103 tot->tx_packets += tx_packets;
104 tot->rx_bytes += rx_bytes;
105 tot->tx_bytes += tx_bytes;
106 }
107
108 tot->rx_errors = dev->stats.rx_errors;
109 tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
110 tot->tx_carrier_errors = dev->stats.tx_carrier_errors;
111 tot->tx_dropped = dev->stats.tx_dropped;
112 tot->tx_aborted_errors = dev->stats.tx_aborted_errors;
113 tot->tx_errors = dev->stats.tx_errors;
114
115 return tot;
116 }
117
118 /*
119 * Must be invoked with rcu_read_lock
120 */
121 static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net,
122 struct net_device *dev, __be32 remote, __be32 local)
123 {
124 unsigned int h0 = HASH(remote);
125 unsigned int h1 = HASH(local);
126 struct ip_tunnel *t;
127 struct sit_net *sitn = net_generic(net, sit_net_id);
128
129 for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) {
130 if (local == t->parms.iph.saddr &&
131 remote == t->parms.iph.daddr &&
132 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
133 (t->dev->flags & IFF_UP))
134 return t;
135 }
136 for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) {
137 if (remote == t->parms.iph.daddr &&
138 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
139 (t->dev->flags & IFF_UP))
140 return t;
141 }
142 for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) {
143 if (local == t->parms.iph.saddr &&
144 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
145 (t->dev->flags & IFF_UP))
146 return t;
147 }
148 t = rcu_dereference(sitn->tunnels_wc[0]);
149 if ((t != NULL) && (t->dev->flags & IFF_UP))
150 return t;
151 return NULL;
152 }
153
154 static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn,
155 struct ip_tunnel_parm *parms)
156 {
157 __be32 remote = parms->iph.daddr;
158 __be32 local = parms->iph.saddr;
159 unsigned int h = 0;
160 int prio = 0;
161
162 if (remote) {
163 prio |= 2;
164 h ^= HASH(remote);
165 }
166 if (local) {
167 prio |= 1;
168 h ^= HASH(local);
169 }
170 return &sitn->tunnels[prio][h];
171 }
172
173 static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn,
174 struct ip_tunnel *t)
175 {
176 return __ipip6_bucket(sitn, &t->parms);
177 }
178
179 static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t)
180 {
181 struct ip_tunnel __rcu **tp;
182 struct ip_tunnel *iter;
183
184 for (tp = ipip6_bucket(sitn, t);
185 (iter = rtnl_dereference(*tp)) != NULL;
186 tp = &iter->next) {
187 if (t == iter) {
188 rcu_assign_pointer(*tp, t->next);
189 break;
190 }
191 }
192 }
193
194 static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t)
195 {
196 struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t);
197
198 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
199 rcu_assign_pointer(*tp, t);
200 }
201
202 static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn)
203 {
204 #ifdef CONFIG_IPV6_SIT_6RD
205 struct ip_tunnel *t = netdev_priv(dev);
206
207 if (t->dev == sitn->fb_tunnel_dev) {
208 ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0);
209 t->ip6rd.relay_prefix = 0;
210 t->ip6rd.prefixlen = 16;
211 t->ip6rd.relay_prefixlen = 0;
212 } else {
213 struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev);
214 memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd));
215 }
216 #endif
217 }
218
219 static int ipip6_tunnel_create(struct net_device *dev)
220 {
221 struct ip_tunnel *t = netdev_priv(dev);
222 struct net *net = dev_net(dev);
223 struct sit_net *sitn = net_generic(net, sit_net_id);
224 int err;
225
226 err = ipip6_tunnel_init(dev);
227 if (err < 0)
228 goto out;
229 ipip6_tunnel_clone_6rd(dev, sitn);
230
231 if ((__force u16)t->parms.i_flags & SIT_ISATAP)
232 dev->priv_flags |= IFF_ISATAP;
233
234 err = register_netdevice(dev);
235 if (err < 0)
236 goto out;
237
238 strcpy(t->parms.name, dev->name);
239 dev->rtnl_link_ops = &sit_link_ops;
240
241 dev_hold(dev);
242
243 ipip6_tunnel_link(sitn, t);
244 return 0;
245
246 out:
247 return err;
248 }
249
250 static struct ip_tunnel *ipip6_tunnel_locate(struct net *net,
251 struct ip_tunnel_parm *parms, int create)
252 {
253 __be32 remote = parms->iph.daddr;
254 __be32 local = parms->iph.saddr;
255 struct ip_tunnel *t, *nt;
256 struct ip_tunnel __rcu **tp;
257 struct net_device *dev;
258 char name[IFNAMSIZ];
259 struct sit_net *sitn = net_generic(net, sit_net_id);
260
261 for (tp = __ipip6_bucket(sitn, parms);
262 (t = rtnl_dereference(*tp)) != NULL;
263 tp = &t->next) {
264 if (local == t->parms.iph.saddr &&
265 remote == t->parms.iph.daddr &&
266 parms->link == t->parms.link) {
267 if (create)
268 return NULL;
269 else
270 return t;
271 }
272 }
273 if (!create)
274 goto failed;
275
276 if (parms->name[0])
277 strlcpy(name, parms->name, IFNAMSIZ);
278 else
279 strcpy(name, "sit%d");
280
281 dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup);
282 if (dev == NULL)
283 return NULL;
284
285 dev_net_set(dev, net);
286
287 nt = netdev_priv(dev);
288
289 nt->parms = *parms;
290 if (ipip6_tunnel_create(dev) < 0)
291 goto failed_free;
292
293 return nt;
294
295 failed_free:
296 ipip6_dev_free(dev);
297 failed:
298 return NULL;
299 }
300
301 #define for_each_prl_rcu(start) \
302 for (prl = rcu_dereference(start); \
303 prl; \
304 prl = rcu_dereference(prl->next))
305
306 static struct ip_tunnel_prl_entry *
307 __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
308 {
309 struct ip_tunnel_prl_entry *prl;
310
311 for_each_prl_rcu(t->prl)
312 if (prl->addr == addr)
313 break;
314 return prl;
315
316 }
317
318 static int ipip6_tunnel_get_prl(struct ip_tunnel *t,
319 struct ip_tunnel_prl __user *a)
320 {
321 struct ip_tunnel_prl kprl, *kp;
322 struct ip_tunnel_prl_entry *prl;
323 unsigned int cmax, c = 0, ca, len;
324 int ret = 0;
325
326 if (copy_from_user(&kprl, a, sizeof(kprl)))
327 return -EFAULT;
328 cmax = kprl.datalen / sizeof(kprl);
329 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY))
330 cmax = 1;
331
332 /* For simple GET or for root users,
333 * we try harder to allocate.
334 */
335 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
336 kcalloc(cmax, sizeof(*kp), GFP_KERNEL) :
337 NULL;
338
339 rcu_read_lock();
340
341 ca = t->prl_count < cmax ? t->prl_count : cmax;
342
343 if (!kp) {
344 /* We don't try hard to allocate much memory for
345 * non-root users.
346 * For root users, retry allocating enough memory for
347 * the answer.
348 */
349 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC);
350 if (!kp) {
351 ret = -ENOMEM;
352 goto out;
353 }
354 }
355
356 c = 0;
357 for_each_prl_rcu(t->prl) {
358 if (c >= cmax)
359 break;
360 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr)
361 continue;
362 kp[c].addr = prl->addr;
363 kp[c].flags = prl->flags;
364 c++;
365 if (kprl.addr != htonl(INADDR_ANY))
366 break;
367 }
368 out:
369 rcu_read_unlock();
370
371 len = sizeof(*kp) * c;
372 ret = 0;
373 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen))
374 ret = -EFAULT;
375
376 kfree(kp);
377
378 return ret;
379 }
380
381 static int
382 ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
383 {
384 struct ip_tunnel_prl_entry *p;
385 int err = 0;
386
387 if (a->addr == htonl(INADDR_ANY))
388 return -EINVAL;
389
390 ASSERT_RTNL();
391
392 for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) {
393 if (p->addr == a->addr) {
394 if (chg) {
395 p->flags = a->flags;
396 goto out;
397 }
398 err = -EEXIST;
399 goto out;
400 }
401 }
402
403 if (chg) {
404 err = -ENXIO;
405 goto out;
406 }
407
408 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
409 if (!p) {
410 err = -ENOBUFS;
411 goto out;
412 }
413
414 p->next = t->prl;
415 p->addr = a->addr;
416 p->flags = a->flags;
417 t->prl_count++;
418 rcu_assign_pointer(t->prl, p);
419 out:
420 return err;
421 }
422
423 static void prl_list_destroy_rcu(struct rcu_head *head)
424 {
425 struct ip_tunnel_prl_entry *p, *n;
426
427 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head);
428 do {
429 n = rcu_dereference_protected(p->next, 1);
430 kfree(p);
431 p = n;
432 } while (p);
433 }
434
435 static int
436 ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
437 {
438 struct ip_tunnel_prl_entry *x;
439 struct ip_tunnel_prl_entry __rcu **p;
440 int err = 0;
441
442 ASSERT_RTNL();
443
444 if (a && a->addr != htonl(INADDR_ANY)) {
445 for (p = &t->prl;
446 (x = rtnl_dereference(*p)) != NULL;
447 p = &x->next) {
448 if (x->addr == a->addr) {
449 *p = x->next;
450 kfree_rcu(x, rcu_head);
451 t->prl_count--;
452 goto out;
453 }
454 }
455 err = -ENXIO;
456 } else {
457 x = rtnl_dereference(t->prl);
458 if (x) {
459 t->prl_count = 0;
460 call_rcu(&x->rcu_head, prl_list_destroy_rcu);
461 t->prl = NULL;
462 }
463 }
464 out:
465 return err;
466 }
467
468 static int
469 isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t)
470 {
471 struct ip_tunnel_prl_entry *p;
472 int ok = 1;
473
474 rcu_read_lock();
475 p = __ipip6_tunnel_locate_prl(t, iph->saddr);
476 if (p) {
477 if (p->flags & PRL_DEFAULT)
478 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
479 else
480 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
481 } else {
482 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
483
484 if (ipv6_addr_is_isatap(addr6) &&
485 (addr6->s6_addr32[3] == iph->saddr) &&
486 ipv6_chk_prefix(addr6, t->dev))
487 skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
488 else
489 ok = 0;
490 }
491 rcu_read_unlock();
492 return ok;
493 }
494
495 static void ipip6_tunnel_uninit(struct net_device *dev)
496 {
497 struct net *net = dev_net(dev);
498 struct sit_net *sitn = net_generic(net, sit_net_id);
499
500 if (dev == sitn->fb_tunnel_dev) {
501 RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL);
502 } else {
503 ipip6_tunnel_unlink(sitn, netdev_priv(dev));
504 ipip6_tunnel_del_prl(netdev_priv(dev), NULL);
505 }
506 dev_put(dev);
507 }
508
509
510 static int ipip6_err(struct sk_buff *skb, u32 info)
511 {
512
513 /* All the routers (except for Linux) return only
514 8 bytes of packet payload. It means, that precise relaying of
515 ICMP in the real Internet is absolutely infeasible.
516 */
517 const struct iphdr *iph = (const struct iphdr *)skb->data;
518 const int type = icmp_hdr(skb)->type;
519 const int code = icmp_hdr(skb)->code;
520 struct ip_tunnel *t;
521 int err;
522
523 switch (type) {
524 default:
525 case ICMP_PARAMETERPROB:
526 return 0;
527
528 case ICMP_DEST_UNREACH:
529 switch (code) {
530 case ICMP_SR_FAILED:
531 case ICMP_PORT_UNREACH:
532 /* Impossible event. */
533 return 0;
534 default:
535 /* All others are translated to HOST_UNREACH.
536 rfc2003 contains "deep thoughts" about NET_UNREACH,
537 I believe they are just ether pollution. --ANK
538 */
539 break;
540 }
541 break;
542 case ICMP_TIME_EXCEEDED:
543 if (code != ICMP_EXC_TTL)
544 return 0;
545 break;
546 case ICMP_REDIRECT:
547 break;
548 }
549
550 err = -ENOENT;
551
552 t = ipip6_tunnel_lookup(dev_net(skb->dev),
553 skb->dev,
554 iph->daddr,
555 iph->saddr);
556 if (t == NULL)
557 goto out;
558
559 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
560 ipv4_update_pmtu(skb, dev_net(skb->dev), info,
561 t->dev->ifindex, 0, IPPROTO_IPV6, 0);
562 err = 0;
563 goto out;
564 }
565 if (type == ICMP_REDIRECT) {
566 ipv4_redirect(skb, dev_net(skb->dev), t->dev->ifindex, 0,
567 IPPROTO_IPV6, 0);
568 err = 0;
569 goto out;
570 }
571
572 if (t->parms.iph.daddr == 0)
573 goto out;
574
575 err = 0;
576 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
577 goto out;
578
579 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
580 t->err_count++;
581 else
582 t->err_count = 1;
583 t->err_time = jiffies;
584 out:
585 return err;
586 }
587
588 static inline void ipip6_ecn_decapsulate(const struct iphdr *iph, struct sk_buff *skb)
589 {
590 if (INET_ECN_is_ce(iph->tos))
591 IP6_ECN_set_ce(ipv6_hdr(skb));
592 }
593
594 static int ipip6_rcv(struct sk_buff *skb)
595 {
596 const struct iphdr *iph;
597 struct ip_tunnel *tunnel;
598
599 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
600 goto out;
601
602 iph = ip_hdr(skb);
603
604 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
605 iph->saddr, iph->daddr);
606 if (tunnel != NULL) {
607 struct pcpu_tstats *tstats;
608
609 secpath_reset(skb);
610 skb->mac_header = skb->network_header;
611 skb_reset_network_header(skb);
612 IPCB(skb)->flags = 0;
613 skb->protocol = htons(ETH_P_IPV6);
614 skb->pkt_type = PACKET_HOST;
615
616 if ((tunnel->dev->priv_flags & IFF_ISATAP) &&
617 !isatap_chksrc(skb, iph, tunnel)) {
618 tunnel->dev->stats.rx_errors++;
619 kfree_skb(skb);
620 return 0;
621 }
622
623 tstats = this_cpu_ptr(tunnel->dev->tstats);
624 tstats->rx_packets++;
625 tstats->rx_bytes += skb->len;
626
627 __skb_tunnel_rx(skb, tunnel->dev);
628
629 ipip6_ecn_decapsulate(iph, skb);
630
631 netif_rx(skb);
632
633 return 0;
634 }
635
636 /* no tunnel matched, let upstream know, ipsec may handle it */
637 return 1;
638 out:
639 kfree_skb(skb);
640 return 0;
641 }
642
643 /*
644 * Returns the embedded IPv4 address if the IPv6 address
645 * comes from 6rd / 6to4 (RFC 3056) addr space.
646 */
647 static inline
648 __be32 try_6rd(const struct in6_addr *v6dst, struct ip_tunnel *tunnel)
649 {
650 __be32 dst = 0;
651
652 #ifdef CONFIG_IPV6_SIT_6RD
653 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix,
654 tunnel->ip6rd.prefixlen)) {
655 unsigned int pbw0, pbi0;
656 int pbi1;
657 u32 d;
658
659 pbw0 = tunnel->ip6rd.prefixlen >> 5;
660 pbi0 = tunnel->ip6rd.prefixlen & 0x1f;
661
662 d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
663 tunnel->ip6rd.relay_prefixlen;
664
665 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;
666 if (pbi1 > 0)
667 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >>
668 (32 - pbi1);
669
670 dst = tunnel->ip6rd.relay_prefix | htonl(d);
671 }
672 #else
673 if (v6dst->s6_addr16[0] == htons(0x2002)) {
674 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
675 memcpy(&dst, &v6dst->s6_addr16[1], 4);
676 }
677 #endif
678 return dst;
679 }
680
681 /*
682 * This function assumes it is being called from dev_queue_xmit()
683 * and that skb is filled properly by that function.
684 */
685
686 static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
687 struct net_device *dev)
688 {
689 struct ip_tunnel *tunnel = netdev_priv(dev);
690 const struct iphdr *tiph = &tunnel->parms.iph;
691 const struct ipv6hdr *iph6 = ipv6_hdr(skb);
692 u8 tos = tunnel->parms.iph.tos;
693 __be16 df = tiph->frag_off;
694 struct rtable *rt; /* Route to the other host */
695 struct net_device *tdev; /* Device to other host */
696 struct iphdr *iph; /* Our new IP header */
697 unsigned int max_headroom; /* The extra header space needed */
698 __be32 dst = tiph->daddr;
699 struct flowi4 fl4;
700 int mtu;
701 const struct in6_addr *addr6;
702 int addr_type;
703
704 if (skb->protocol != htons(ETH_P_IPV6))
705 goto tx_error;
706
707 if (tos == 1)
708 tos = ipv6_get_dsfield(iph6);
709
710 /* ISATAP (RFC4214) - must come before 6to4 */
711 if (dev->priv_flags & IFF_ISATAP) {
712 struct neighbour *neigh = NULL;
713 bool do_tx_error = false;
714
715 if (skb_dst(skb))
716 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
717
718 if (neigh == NULL) {
719 net_dbg_ratelimited("sit: nexthop == NULL\n");
720 goto tx_error;
721 }
722
723 addr6 = (const struct in6_addr *)&neigh->primary_key;
724 addr_type = ipv6_addr_type(addr6);
725
726 if ((addr_type & IPV6_ADDR_UNICAST) &&
727 ipv6_addr_is_isatap(addr6))
728 dst = addr6->s6_addr32[3];
729 else
730 do_tx_error = true;
731
732 neigh_release(neigh);
733 if (do_tx_error)
734 goto tx_error;
735 }
736
737 if (!dst)
738 dst = try_6rd(&iph6->daddr, tunnel);
739
740 if (!dst) {
741 struct neighbour *neigh = NULL;
742 bool do_tx_error = false;
743
744 if (skb_dst(skb))
745 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
746
747 if (neigh == NULL) {
748 net_dbg_ratelimited("sit: nexthop == NULL\n");
749 goto tx_error;
750 }
751
752 addr6 = (const struct in6_addr *)&neigh->primary_key;
753 addr_type = ipv6_addr_type(addr6);
754
755 if (addr_type == IPV6_ADDR_ANY) {
756 addr6 = &ipv6_hdr(skb)->daddr;
757 addr_type = ipv6_addr_type(addr6);
758 }
759
760 if ((addr_type & IPV6_ADDR_COMPATv4) != 0)
761 dst = addr6->s6_addr32[3];
762 else
763 do_tx_error = true;
764
765 neigh_release(neigh);
766 if (do_tx_error)
767 goto tx_error;
768 }
769
770 rt = ip_route_output_ports(dev_net(dev), &fl4, NULL,
771 dst, tiph->saddr,
772 0, 0,
773 IPPROTO_IPV6, RT_TOS(tos),
774 tunnel->parms.link);
775 if (IS_ERR(rt)) {
776 dev->stats.tx_carrier_errors++;
777 goto tx_error_icmp;
778 }
779 if (rt->rt_type != RTN_UNICAST) {
780 ip_rt_put(rt);
781 dev->stats.tx_carrier_errors++;
782 goto tx_error_icmp;
783 }
784 tdev = rt->dst.dev;
785
786 if (tdev == dev) {
787 ip_rt_put(rt);
788 dev->stats.collisions++;
789 goto tx_error;
790 }
791
792 if (df) {
793 mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr);
794
795 if (mtu < 68) {
796 dev->stats.collisions++;
797 ip_rt_put(rt);
798 goto tx_error;
799 }
800
801 if (mtu < IPV6_MIN_MTU) {
802 mtu = IPV6_MIN_MTU;
803 df = 0;
804 }
805
806 if (tunnel->parms.iph.daddr && skb_dst(skb))
807 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
808
809 if (skb->len > mtu) {
810 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
811 ip_rt_put(rt);
812 goto tx_error;
813 }
814 }
815
816 if (tunnel->err_count > 0) {
817 if (time_before(jiffies,
818 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
819 tunnel->err_count--;
820 dst_link_failure(skb);
821 } else
822 tunnel->err_count = 0;
823 }
824
825 /*
826 * Okay, now see if we can stuff it in the buffer as-is.
827 */
828 max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr);
829
830 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
831 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
832 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
833 if (!new_skb) {
834 ip_rt_put(rt);
835 dev->stats.tx_dropped++;
836 dev_kfree_skb(skb);
837 return NETDEV_TX_OK;
838 }
839 if (skb->sk)
840 skb_set_owner_w(new_skb, skb->sk);
841 dev_kfree_skb(skb);
842 skb = new_skb;
843 iph6 = ipv6_hdr(skb);
844 }
845
846 skb->transport_header = skb->network_header;
847 skb_push(skb, sizeof(struct iphdr));
848 skb_reset_network_header(skb);
849 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
850 IPCB(skb)->flags = 0;
851 skb_dst_drop(skb);
852 skb_dst_set(skb, &rt->dst);
853
854 /*
855 * Push down and install the IPIP header.
856 */
857
858 iph = ip_hdr(skb);
859 iph->version = 4;
860 iph->ihl = sizeof(struct iphdr)>>2;
861 iph->frag_off = df;
862 iph->protocol = IPPROTO_IPV6;
863 iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
864 iph->daddr = fl4.daddr;
865 iph->saddr = fl4.saddr;
866
867 if ((iph->ttl = tiph->ttl) == 0)
868 iph->ttl = iph6->hop_limit;
869
870 iptunnel_xmit(skb, dev);
871 return NETDEV_TX_OK;
872
873 tx_error_icmp:
874 dst_link_failure(skb);
875 tx_error:
876 dev->stats.tx_errors++;
877 dev_kfree_skb(skb);
878 return NETDEV_TX_OK;
879 }
880
881 static void ipip6_tunnel_bind_dev(struct net_device *dev)
882 {
883 struct net_device *tdev = NULL;
884 struct ip_tunnel *tunnel;
885 const struct iphdr *iph;
886 struct flowi4 fl4;
887
888 tunnel = netdev_priv(dev);
889 iph = &tunnel->parms.iph;
890
891 if (iph->daddr) {
892 struct rtable *rt = ip_route_output_ports(dev_net(dev), &fl4, NULL,
893 iph->daddr, iph->saddr,
894 0, 0,
895 IPPROTO_IPV6,
896 RT_TOS(iph->tos),
897 tunnel->parms.link);
898
899 if (!IS_ERR(rt)) {
900 tdev = rt->dst.dev;
901 ip_rt_put(rt);
902 }
903 dev->flags |= IFF_POINTOPOINT;
904 }
905
906 if (!tdev && tunnel->parms.link)
907 tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
908
909 if (tdev) {
910 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
911 dev->mtu = tdev->mtu - sizeof(struct iphdr);
912 if (dev->mtu < IPV6_MIN_MTU)
913 dev->mtu = IPV6_MIN_MTU;
914 }
915 dev->iflink = tunnel->parms.link;
916 }
917
918 static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p)
919 {
920 struct net *net = dev_net(t->dev);
921 struct sit_net *sitn = net_generic(net, sit_net_id);
922
923 ipip6_tunnel_unlink(sitn, t);
924 synchronize_net();
925 t->parms.iph.saddr = p->iph.saddr;
926 t->parms.iph.daddr = p->iph.daddr;
927 memcpy(t->dev->dev_addr, &p->iph.saddr, 4);
928 memcpy(t->dev->broadcast, &p->iph.daddr, 4);
929 ipip6_tunnel_link(sitn, t);
930 t->parms.iph.ttl = p->iph.ttl;
931 t->parms.iph.tos = p->iph.tos;
932 if (t->parms.link != p->link) {
933 t->parms.link = p->link;
934 ipip6_tunnel_bind_dev(t->dev);
935 }
936 netdev_state_change(t->dev);
937 }
938
939 static int
940 ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
941 {
942 int err = 0;
943 struct ip_tunnel_parm p;
944 struct ip_tunnel_prl prl;
945 struct ip_tunnel *t;
946 struct net *net = dev_net(dev);
947 struct sit_net *sitn = net_generic(net, sit_net_id);
948 #ifdef CONFIG_IPV6_SIT_6RD
949 struct ip_tunnel_6rd ip6rd;
950 #endif
951
952 switch (cmd) {
953 case SIOCGETTUNNEL:
954 #ifdef CONFIG_IPV6_SIT_6RD
955 case SIOCGET6RD:
956 #endif
957 t = NULL;
958 if (dev == sitn->fb_tunnel_dev) {
959 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
960 err = -EFAULT;
961 break;
962 }
963 t = ipip6_tunnel_locate(net, &p, 0);
964 }
965 if (t == NULL)
966 t = netdev_priv(dev);
967
968 err = -EFAULT;
969 if (cmd == SIOCGETTUNNEL) {
970 memcpy(&p, &t->parms, sizeof(p));
971 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p,
972 sizeof(p)))
973 goto done;
974 #ifdef CONFIG_IPV6_SIT_6RD
975 } else {
976 ip6rd.prefix = t->ip6rd.prefix;
977 ip6rd.relay_prefix = t->ip6rd.relay_prefix;
978 ip6rd.prefixlen = t->ip6rd.prefixlen;
979 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;
980 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd,
981 sizeof(ip6rd)))
982 goto done;
983 #endif
984 }
985 err = 0;
986 break;
987
988 case SIOCADDTUNNEL:
989 case SIOCCHGTUNNEL:
990 err = -EPERM;
991 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
992 goto done;
993
994 err = -EFAULT;
995 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
996 goto done;
997
998 err = -EINVAL;
999 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 ||
1000 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
1001 goto done;
1002 if (p.iph.ttl)
1003 p.iph.frag_off |= htons(IP_DF);
1004
1005 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
1006
1007 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1008 if (t != NULL) {
1009 if (t->dev != dev) {
1010 err = -EEXIST;
1011 break;
1012 }
1013 } else {
1014 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
1015 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
1016 err = -EINVAL;
1017 break;
1018 }
1019 t = netdev_priv(dev);
1020 }
1021
1022 ipip6_tunnel_update(t, &p);
1023 }
1024
1025 if (t) {
1026 err = 0;
1027 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
1028 err = -EFAULT;
1029 } else
1030 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1031 break;
1032
1033 case SIOCDELTUNNEL:
1034 err = -EPERM;
1035 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1036 goto done;
1037
1038 if (dev == sitn->fb_tunnel_dev) {
1039 err = -EFAULT;
1040 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1041 goto done;
1042 err = -ENOENT;
1043 if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL)
1044 goto done;
1045 err = -EPERM;
1046 if (t == netdev_priv(sitn->fb_tunnel_dev))
1047 goto done;
1048 dev = t->dev;
1049 }
1050 unregister_netdevice(dev);
1051 err = 0;
1052 break;
1053
1054 case SIOCGETPRL:
1055 err = -EINVAL;
1056 if (dev == sitn->fb_tunnel_dev)
1057 goto done;
1058 err = -ENOENT;
1059 if (!(t = netdev_priv(dev)))
1060 goto done;
1061 err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data);
1062 break;
1063
1064 case SIOCADDPRL:
1065 case SIOCDELPRL:
1066 case SIOCCHGPRL:
1067 err = -EPERM;
1068 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1069 goto done;
1070 err = -EINVAL;
1071 if (dev == sitn->fb_tunnel_dev)
1072 goto done;
1073 err = -EFAULT;
1074 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
1075 goto done;
1076 err = -ENOENT;
1077 if (!(t = netdev_priv(dev)))
1078 goto done;
1079
1080 switch (cmd) {
1081 case SIOCDELPRL:
1082 err = ipip6_tunnel_del_prl(t, &prl);
1083 break;
1084 case SIOCADDPRL:
1085 case SIOCCHGPRL:
1086 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
1087 break;
1088 }
1089 netdev_state_change(dev);
1090 break;
1091
1092 #ifdef CONFIG_IPV6_SIT_6RD
1093 case SIOCADD6RD:
1094 case SIOCCHG6RD:
1095 case SIOCDEL6RD:
1096 err = -EPERM;
1097 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1098 goto done;
1099
1100 err = -EFAULT;
1101 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data,
1102 sizeof(ip6rd)))
1103 goto done;
1104
1105 t = netdev_priv(dev);
1106
1107 if (cmd != SIOCDEL6RD) {
1108 struct in6_addr prefix;
1109 __be32 relay_prefix;
1110
1111 err = -EINVAL;
1112 if (ip6rd.relay_prefixlen > 32 ||
1113 ip6rd.prefixlen + (32 - ip6rd.relay_prefixlen) > 64)
1114 goto done;
1115
1116 ipv6_addr_prefix(&prefix, &ip6rd.prefix,
1117 ip6rd.prefixlen);
1118 if (!ipv6_addr_equal(&prefix, &ip6rd.prefix))
1119 goto done;
1120 if (ip6rd.relay_prefixlen)
1121 relay_prefix = ip6rd.relay_prefix &
1122 htonl(0xffffffffUL <<
1123 (32 - ip6rd.relay_prefixlen));
1124 else
1125 relay_prefix = 0;
1126 if (relay_prefix != ip6rd.relay_prefix)
1127 goto done;
1128
1129 t->ip6rd.prefix = prefix;
1130 t->ip6rd.relay_prefix = relay_prefix;
1131 t->ip6rd.prefixlen = ip6rd.prefixlen;
1132 t->ip6rd.relay_prefixlen = ip6rd.relay_prefixlen;
1133 } else
1134 ipip6_tunnel_clone_6rd(dev, sitn);
1135
1136 err = 0;
1137 break;
1138 #endif
1139
1140 default:
1141 err = -EINVAL;
1142 }
1143
1144 done:
1145 return err;
1146 }
1147
1148 static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1149 {
1150 if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr))
1151 return -EINVAL;
1152 dev->mtu = new_mtu;
1153 return 0;
1154 }
1155
1156 static const struct net_device_ops ipip6_netdev_ops = {
1157 .ndo_uninit = ipip6_tunnel_uninit,
1158 .ndo_start_xmit = ipip6_tunnel_xmit,
1159 .ndo_do_ioctl = ipip6_tunnel_ioctl,
1160 .ndo_change_mtu = ipip6_tunnel_change_mtu,
1161 .ndo_get_stats64= ipip6_get_stats64,
1162 };
1163
1164 static void ipip6_dev_free(struct net_device *dev)
1165 {
1166 free_percpu(dev->tstats);
1167 free_netdev(dev);
1168 }
1169
1170 static void ipip6_tunnel_setup(struct net_device *dev)
1171 {
1172 dev->netdev_ops = &ipip6_netdev_ops;
1173 dev->destructor = ipip6_dev_free;
1174
1175 dev->type = ARPHRD_SIT;
1176 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
1177 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr);
1178 dev->flags = IFF_NOARP;
1179 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1180 dev->iflink = 0;
1181 dev->addr_len = 4;
1182 dev->features |= NETIF_F_NETNS_LOCAL;
1183 dev->features |= NETIF_F_LLTX;
1184 }
1185
1186 static int ipip6_tunnel_init(struct net_device *dev)
1187 {
1188 struct ip_tunnel *tunnel = netdev_priv(dev);
1189
1190 tunnel->dev = dev;
1191
1192 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
1193 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
1194
1195 ipip6_tunnel_bind_dev(dev);
1196 dev->tstats = alloc_percpu(struct pcpu_tstats);
1197 if (!dev->tstats)
1198 return -ENOMEM;
1199
1200 return 0;
1201 }
1202
1203 static int __net_init ipip6_fb_tunnel_init(struct net_device *dev)
1204 {
1205 struct ip_tunnel *tunnel = netdev_priv(dev);
1206 struct iphdr *iph = &tunnel->parms.iph;
1207 struct net *net = dev_net(dev);
1208 struct sit_net *sitn = net_generic(net, sit_net_id);
1209
1210 tunnel->dev = dev;
1211 strcpy(tunnel->parms.name, dev->name);
1212
1213 iph->version = 4;
1214 iph->protocol = IPPROTO_IPV6;
1215 iph->ihl = 5;
1216 iph->ttl = 64;
1217
1218 dev->tstats = alloc_percpu(struct pcpu_tstats);
1219 if (!dev->tstats)
1220 return -ENOMEM;
1221 dev_hold(dev);
1222 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel);
1223 return 0;
1224 }
1225
1226 static void ipip6_netlink_parms(struct nlattr *data[],
1227 struct ip_tunnel_parm *parms)
1228 {
1229 memset(parms, 0, sizeof(*parms));
1230
1231 parms->iph.version = 4;
1232 parms->iph.protocol = IPPROTO_IPV6;
1233 parms->iph.ihl = 5;
1234 parms->iph.ttl = 64;
1235
1236 if (!data)
1237 return;
1238
1239 if (data[IFLA_IPTUN_LINK])
1240 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1241
1242 if (data[IFLA_IPTUN_LOCAL])
1243 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]);
1244
1245 if (data[IFLA_IPTUN_REMOTE])
1246 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]);
1247
1248 if (data[IFLA_IPTUN_TTL]) {
1249 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
1250 if (parms->iph.ttl)
1251 parms->iph.frag_off = htons(IP_DF);
1252 }
1253
1254 if (data[IFLA_IPTUN_TOS])
1255 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
1256
1257 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
1258 parms->iph.frag_off = htons(IP_DF);
1259
1260 if (data[IFLA_IPTUN_FLAGS])
1261 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]);
1262 }
1263
1264 static int ipip6_newlink(struct net *src_net, struct net_device *dev,
1265 struct nlattr *tb[], struct nlattr *data[])
1266 {
1267 struct net *net = dev_net(dev);
1268 struct ip_tunnel *nt;
1269
1270 nt = netdev_priv(dev);
1271 ipip6_netlink_parms(data, &nt->parms);
1272
1273 if (ipip6_tunnel_locate(net, &nt->parms, 0))
1274 return -EEXIST;
1275
1276 return ipip6_tunnel_create(dev);
1277 }
1278
1279 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[],
1280 struct nlattr *data[])
1281 {
1282 struct ip_tunnel *t;
1283 struct ip_tunnel_parm p;
1284 struct net *net = dev_net(dev);
1285 struct sit_net *sitn = net_generic(net, sit_net_id);
1286
1287 if (dev == sitn->fb_tunnel_dev)
1288 return -EINVAL;
1289
1290 ipip6_netlink_parms(data, &p);
1291
1292 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
1293 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
1294 return -EINVAL;
1295
1296 t = ipip6_tunnel_locate(net, &p, 0);
1297
1298 if (t) {
1299 if (t->dev != dev)
1300 return -EEXIST;
1301 } else
1302 t = netdev_priv(dev);
1303
1304 ipip6_tunnel_update(t, &p);
1305 return 0;
1306 }
1307
1308 static size_t ipip6_get_size(const struct net_device *dev)
1309 {
1310 return
1311 /* IFLA_IPTUN_LINK */
1312 nla_total_size(4) +
1313 /* IFLA_IPTUN_LOCAL */
1314 nla_total_size(4) +
1315 /* IFLA_IPTUN_REMOTE */
1316 nla_total_size(4) +
1317 /* IFLA_IPTUN_TTL */
1318 nla_total_size(1) +
1319 /* IFLA_IPTUN_TOS */
1320 nla_total_size(1) +
1321 /* IFLA_IPTUN_PMTUDISC */
1322 nla_total_size(1) +
1323 /* IFLA_IPTUN_FLAGS */
1324 nla_total_size(2) +
1325 0;
1326 }
1327
1328 static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1329 {
1330 struct ip_tunnel *tunnel = netdev_priv(dev);
1331 struct ip_tunnel_parm *parm = &tunnel->parms;
1332
1333 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
1334 nla_put_be32(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
1335 nla_put_be32(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
1336 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
1337 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
1338 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
1339 !!(parm->iph.frag_off & htons(IP_DF))) ||
1340 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags))
1341 goto nla_put_failure;
1342 return 0;
1343
1344 nla_put_failure:
1345 return -EMSGSIZE;
1346 }
1347
1348 static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = {
1349 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1350 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 },
1351 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 },
1352 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1353 [IFLA_IPTUN_TOS] = { .type = NLA_U8 },
1354 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 },
1355 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 },
1356 };
1357
1358 static struct rtnl_link_ops sit_link_ops __read_mostly = {
1359 .kind = "sit",
1360 .maxtype = IFLA_IPTUN_MAX,
1361 .policy = ipip6_policy,
1362 .priv_size = sizeof(struct ip_tunnel),
1363 .setup = ipip6_tunnel_setup,
1364 .newlink = ipip6_newlink,
1365 .changelink = ipip6_changelink,
1366 .get_size = ipip6_get_size,
1367 .fill_info = ipip6_fill_info,
1368 };
1369
1370 static struct xfrm_tunnel sit_handler __read_mostly = {
1371 .handler = ipip6_rcv,
1372 .err_handler = ipip6_err,
1373 .priority = 1,
1374 };
1375
1376 static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head)
1377 {
1378 int prio;
1379
1380 for (prio = 1; prio < 4; prio++) {
1381 int h;
1382 for (h = 0; h < HASH_SIZE; h++) {
1383 struct ip_tunnel *t;
1384
1385 t = rtnl_dereference(sitn->tunnels[prio][h]);
1386 while (t != NULL) {
1387 unregister_netdevice_queue(t->dev, head);
1388 t = rtnl_dereference(t->next);
1389 }
1390 }
1391 }
1392 }
1393
1394 static int __net_init sit_init_net(struct net *net)
1395 {
1396 struct sit_net *sitn = net_generic(net, sit_net_id);
1397 struct ip_tunnel *t;
1398 int err;
1399
1400 sitn->tunnels[0] = sitn->tunnels_wc;
1401 sitn->tunnels[1] = sitn->tunnels_l;
1402 sitn->tunnels[2] = sitn->tunnels_r;
1403 sitn->tunnels[3] = sitn->tunnels_r_l;
1404
1405 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
1406 ipip6_tunnel_setup);
1407 if (!sitn->fb_tunnel_dev) {
1408 err = -ENOMEM;
1409 goto err_alloc_dev;
1410 }
1411 dev_net_set(sitn->fb_tunnel_dev, net);
1412
1413 err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
1414 if (err)
1415 goto err_dev_free;
1416
1417 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
1418
1419 if ((err = register_netdev(sitn->fb_tunnel_dev)))
1420 goto err_reg_dev;
1421
1422 t = netdev_priv(sitn->fb_tunnel_dev);
1423
1424 strcpy(t->parms.name, sitn->fb_tunnel_dev->name);
1425 return 0;
1426
1427 err_reg_dev:
1428 dev_put(sitn->fb_tunnel_dev);
1429 err_dev_free:
1430 ipip6_dev_free(sitn->fb_tunnel_dev);
1431 err_alloc_dev:
1432 return err;
1433 }
1434
1435 static void __net_exit sit_exit_net(struct net *net)
1436 {
1437 struct sit_net *sitn = net_generic(net, sit_net_id);
1438 LIST_HEAD(list);
1439
1440 rtnl_lock();
1441 sit_destroy_tunnels(sitn, &list);
1442 unregister_netdevice_queue(sitn->fb_tunnel_dev, &list);
1443 unregister_netdevice_many(&list);
1444 rtnl_unlock();
1445 }
1446
1447 static struct pernet_operations sit_net_ops = {
1448 .init = sit_init_net,
1449 .exit = sit_exit_net,
1450 .id = &sit_net_id,
1451 .size = sizeof(struct sit_net),
1452 };
1453
1454 static void __exit sit_cleanup(void)
1455 {
1456 rtnl_link_unregister(&sit_link_ops);
1457 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1458
1459 unregister_pernet_device(&sit_net_ops);
1460 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1461 }
1462
1463 static int __init sit_init(void)
1464 {
1465 int err;
1466
1467 pr_info("IPv6 over IPv4 tunneling driver\n");
1468
1469 err = register_pernet_device(&sit_net_ops);
1470 if (err < 0)
1471 return err;
1472 err = xfrm4_tunnel_register(&sit_handler, AF_INET6);
1473 if (err < 0) {
1474 pr_info("%s: can't add protocol\n", __func__);
1475 goto xfrm_tunnel_failed;
1476 }
1477 err = rtnl_link_register(&sit_link_ops);
1478 if (err < 0)
1479 goto rtnl_link_failed;
1480
1481 out:
1482 return err;
1483
1484 rtnl_link_failed:
1485 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1486 xfrm_tunnel_failed:
1487 unregister_pernet_device(&sit_net_ops);
1488 goto out;
1489 }
1490
1491 module_init(sit_init);
1492 module_exit(sit_cleanup);
1493 MODULE_LICENSE("GPL");
1494 MODULE_ALIAS_NETDEV("sit0");
Linux kernel - Deliverables
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