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tracing: Add per_cpu directory into tracing instances
[linux-2.6.git] / net / ipv6 / sit.c
blobcfba99b2c2a4958144ff4c2a2faa1d98192d7310
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 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 struct rtnl_link_ops sit_link_ops __read_mostly;
76
77 static int sit_net_id __read_mostly;
78 struct sit_net {
79 struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE];
80 struct ip_tunnel __rcu *tunnels_r[HASH_SIZE];
81 struct ip_tunnel __rcu *tunnels_l[HASH_SIZE];
82 struct ip_tunnel __rcu *tunnels_wc[1];
83 struct ip_tunnel __rcu **tunnels[4];
84
85 struct net_device *fb_tunnel_dev;
86 };
87
88 static struct rtnl_link_stats64 *ipip6_get_stats64(struct net_device *dev,
89 struct rtnl_link_stats64 *tot)
90 {
91 int i;
92
93 for_each_possible_cpu(i) {
94 const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
95 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
96 unsigned int start;
97
98 do {
99 start = u64_stats_fetch_begin_bh(&tstats->syncp);
100 rx_packets = tstats->rx_packets;
101 tx_packets = tstats->tx_packets;
102 rx_bytes = tstats->rx_bytes;
103 tx_bytes = tstats->tx_bytes;
104 } while (u64_stats_fetch_retry_bh(&tstats->syncp, start));
105
106 tot->rx_packets += rx_packets;
107 tot->tx_packets += tx_packets;
108 tot->rx_bytes += rx_bytes;
109 tot->tx_bytes += tx_bytes;
110 }
111
112 tot->rx_errors = dev->stats.rx_errors;
113 tot->rx_frame_errors = dev->stats.rx_frame_errors;
114 tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
115 tot->tx_carrier_errors = dev->stats.tx_carrier_errors;
116 tot->tx_dropped = dev->stats.tx_dropped;
117 tot->tx_aborted_errors = dev->stats.tx_aborted_errors;
118 tot->tx_errors = dev->stats.tx_errors;
119
120 return tot;
121 }
122
123 /*
124 * Must be invoked with rcu_read_lock
125 */
126 static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net,
127 struct net_device *dev, __be32 remote, __be32 local)
128 {
129 unsigned int h0 = HASH(remote);
130 unsigned int h1 = HASH(local);
131 struct ip_tunnel *t;
132 struct sit_net *sitn = net_generic(net, sit_net_id);
133
134 for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) {
135 if (local == t->parms.iph.saddr &&
136 remote == t->parms.iph.daddr &&
137 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
138 (t->dev->flags & IFF_UP))
139 return t;
140 }
141 for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) {
142 if (remote == t->parms.iph.daddr &&
143 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
144 (t->dev->flags & IFF_UP))
145 return t;
146 }
147 for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) {
148 if (local == t->parms.iph.saddr &&
149 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
150 (t->dev->flags & IFF_UP))
151 return t;
152 }
153 t = rcu_dereference(sitn->tunnels_wc[0]);
154 if ((t != NULL) && (t->dev->flags & IFF_UP))
155 return t;
156 return NULL;
157 }
158
159 static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn,
160 struct ip_tunnel_parm *parms)
161 {
162 __be32 remote = parms->iph.daddr;
163 __be32 local = parms->iph.saddr;
164 unsigned int h = 0;
165 int prio = 0;
166
167 if (remote) {
168 prio |= 2;
169 h ^= HASH(remote);
170 }
171 if (local) {
172 prio |= 1;
173 h ^= HASH(local);
174 }
175 return &sitn->tunnels[prio][h];
176 }
177
178 static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn,
179 struct ip_tunnel *t)
180 {
181 return __ipip6_bucket(sitn, &t->parms);
182 }
183
184 static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t)
185 {
186 struct ip_tunnel __rcu **tp;
187 struct ip_tunnel *iter;
188
189 for (tp = ipip6_bucket(sitn, t);
190 (iter = rtnl_dereference(*tp)) != NULL;
191 tp = &iter->next) {
192 if (t == iter) {
193 rcu_assign_pointer(*tp, t->next);
194 break;
195 }
196 }
197 }
198
199 static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t)
200 {
201 struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t);
202
203 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
204 rcu_assign_pointer(*tp, t);
205 }
206
207 static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn)
208 {
209 #ifdef CONFIG_IPV6_SIT_6RD
210 struct ip_tunnel *t = netdev_priv(dev);
211
212 if (t->dev == sitn->fb_tunnel_dev) {
213 ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0);
214 t->ip6rd.relay_prefix = 0;
215 t->ip6rd.prefixlen = 16;
216 t->ip6rd.relay_prefixlen = 0;
217 } else {
218 struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev);
219 memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd));
220 }
221 #endif
222 }
223
224 static int ipip6_tunnel_create(struct net_device *dev)
225 {
226 struct ip_tunnel *t = netdev_priv(dev);
227 struct net *net = dev_net(dev);
228 struct sit_net *sitn = net_generic(net, sit_net_id);
229 int err;
230
231 err = ipip6_tunnel_init(dev);
232 if (err < 0)
233 goto out;
234 ipip6_tunnel_clone_6rd(dev, sitn);
235
236 if ((__force u16)t->parms.i_flags & SIT_ISATAP)
237 dev->priv_flags |= IFF_ISATAP;
238
239 err = register_netdevice(dev);
240 if (err < 0)
241 goto out;
242
243 strcpy(t->parms.name, dev->name);
244 dev->rtnl_link_ops = &sit_link_ops;
245
246 dev_hold(dev);
247
248 ipip6_tunnel_link(sitn, t);
249 return 0;
250
251 out:
252 return err;
253 }
254
255 static struct ip_tunnel *ipip6_tunnel_locate(struct net *net,
256 struct ip_tunnel_parm *parms, int create)
257 {
258 __be32 remote = parms->iph.daddr;
259 __be32 local = parms->iph.saddr;
260 struct ip_tunnel *t, *nt;
261 struct ip_tunnel __rcu **tp;
262 struct net_device *dev;
263 char name[IFNAMSIZ];
264 struct sit_net *sitn = net_generic(net, sit_net_id);
265
266 for (tp = __ipip6_bucket(sitn, parms);
267 (t = rtnl_dereference(*tp)) != NULL;
268 tp = &t->next) {
269 if (local == t->parms.iph.saddr &&
270 remote == t->parms.iph.daddr &&
271 parms->link == t->parms.link) {
272 if (create)
273 return NULL;
274 else
275 return t;
276 }
277 }
278 if (!create)
279 goto failed;
280
281 if (parms->name[0])
282 strlcpy(name, parms->name, IFNAMSIZ);
283 else
284 strcpy(name, "sit%d");
285
286 dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup);
287 if (dev == NULL)
288 return NULL;
289
290 dev_net_set(dev, net);
291
292 nt = netdev_priv(dev);
293
294 nt->parms = *parms;
295 if (ipip6_tunnel_create(dev) < 0)
296 goto failed_free;
297
298 return nt;
299
300 failed_free:
301 ipip6_dev_free(dev);
302 failed:
303 return NULL;
304 }
305
306 #define for_each_prl_rcu(start) \
307 for (prl = rcu_dereference(start); \
308 prl; \
309 prl = rcu_dereference(prl->next))
310
311 static struct ip_tunnel_prl_entry *
312 __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
313 {
314 struct ip_tunnel_prl_entry *prl;
315
316 for_each_prl_rcu(t->prl)
317 if (prl->addr == addr)
318 break;
319 return prl;
320
321 }
322
323 static int ipip6_tunnel_get_prl(struct ip_tunnel *t,
324 struct ip_tunnel_prl __user *a)
325 {
326 struct ip_tunnel_prl kprl, *kp;
327 struct ip_tunnel_prl_entry *prl;
328 unsigned int cmax, c = 0, ca, len;
329 int ret = 0;
330
331 if (copy_from_user(&kprl, a, sizeof(kprl)))
332 return -EFAULT;
333 cmax = kprl.datalen / sizeof(kprl);
334 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY))
335 cmax = 1;
336
337 /* For simple GET or for root users,
338 * we try harder to allocate.
339 */
340 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
341 kcalloc(cmax, sizeof(*kp), GFP_KERNEL) :
342 NULL;
343
344 rcu_read_lock();
345
346 ca = t->prl_count < cmax ? t->prl_count : cmax;
347
348 if (!kp) {
349 /* We don't try hard to allocate much memory for
350 * non-root users.
351 * For root users, retry allocating enough memory for
352 * the answer.
353 */
354 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC);
355 if (!kp) {
356 ret = -ENOMEM;
357 goto out;
358 }
359 }
360
361 c = 0;
362 for_each_prl_rcu(t->prl) {
363 if (c >= cmax)
364 break;
365 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr)
366 continue;
367 kp[c].addr = prl->addr;
368 kp[c].flags = prl->flags;
369 c++;
370 if (kprl.addr != htonl(INADDR_ANY))
371 break;
372 }
373 out:
374 rcu_read_unlock();
375
376 len = sizeof(*kp) * c;
377 ret = 0;
378 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen))
379 ret = -EFAULT;
380
381 kfree(kp);
382
383 return ret;
384 }
385
386 static int
387 ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
388 {
389 struct ip_tunnel_prl_entry *p;
390 int err = 0;
391
392 if (a->addr == htonl(INADDR_ANY))
393 return -EINVAL;
394
395 ASSERT_RTNL();
396
397 for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) {
398 if (p->addr == a->addr) {
399 if (chg) {
400 p->flags = a->flags;
401 goto out;
402 }
403 err = -EEXIST;
404 goto out;
405 }
406 }
407
408 if (chg) {
409 err = -ENXIO;
410 goto out;
411 }
412
413 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
414 if (!p) {
415 err = -ENOBUFS;
416 goto out;
417 }
418
419 p->next = t->prl;
420 p->addr = a->addr;
421 p->flags = a->flags;
422 t->prl_count++;
423 rcu_assign_pointer(t->prl, p);
424 out:
425 return err;
426 }
427
428 static void prl_list_destroy_rcu(struct rcu_head *head)
429 {
430 struct ip_tunnel_prl_entry *p, *n;
431
432 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head);
433 do {
434 n = rcu_dereference_protected(p->next, 1);
435 kfree(p);
436 p = n;
437 } while (p);
438 }
439
440 static int
441 ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
442 {
443 struct ip_tunnel_prl_entry *x;
444 struct ip_tunnel_prl_entry __rcu **p;
445 int err = 0;
446
447 ASSERT_RTNL();
448
449 if (a && a->addr != htonl(INADDR_ANY)) {
450 for (p = &t->prl;
451 (x = rtnl_dereference(*p)) != NULL;
452 p = &x->next) {
453 if (x->addr == a->addr) {
454 *p = x->next;
455 kfree_rcu(x, rcu_head);
456 t->prl_count--;
457 goto out;
458 }
459 }
460 err = -ENXIO;
461 } else {
462 x = rtnl_dereference(t->prl);
463 if (x) {
464 t->prl_count = 0;
465 call_rcu(&x->rcu_head, prl_list_destroy_rcu);
466 t->prl = NULL;
467 }
468 }
469 out:
470 return err;
471 }
472
473 static int
474 isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t)
475 {
476 struct ip_tunnel_prl_entry *p;
477 int ok = 1;
478
479 rcu_read_lock();
480 p = __ipip6_tunnel_locate_prl(t, iph->saddr);
481 if (p) {
482 if (p->flags & PRL_DEFAULT)
483 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
484 else
485 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
486 } else {
487 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
488
489 if (ipv6_addr_is_isatap(addr6) &&
490 (addr6->s6_addr32[3] == iph->saddr) &&
491 ipv6_chk_prefix(addr6, t->dev))
492 skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
493 else
494 ok = 0;
495 }
496 rcu_read_unlock();
497 return ok;
498 }
499
500 static void ipip6_tunnel_uninit(struct net_device *dev)
501 {
502 struct net *net = dev_net(dev);
503 struct sit_net *sitn = net_generic(net, sit_net_id);
504
505 if (dev == sitn->fb_tunnel_dev) {
506 RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL);
507 } else {
508 ipip6_tunnel_unlink(sitn, netdev_priv(dev));
509 ipip6_tunnel_del_prl(netdev_priv(dev), NULL);
510 }
511 dev_put(dev);
512 }
513
514
515 static int ipip6_err(struct sk_buff *skb, u32 info)
516 {
517
518 /* All the routers (except for Linux) return only
519 8 bytes of packet payload. It means, that precise relaying of
520 ICMP in the real Internet is absolutely infeasible.
521 */
522 const struct iphdr *iph = (const struct iphdr *)skb->data;
523 const int type = icmp_hdr(skb)->type;
524 const int code = icmp_hdr(skb)->code;
525 struct ip_tunnel *t;
526 int err;
527
528 switch (type) {
529 default:
530 case ICMP_PARAMETERPROB:
531 return 0;
532
533 case ICMP_DEST_UNREACH:
534 switch (code) {
535 case ICMP_SR_FAILED:
536 case ICMP_PORT_UNREACH:
537 /* Impossible event. */
538 return 0;
539 default:
540 /* All others are translated to HOST_UNREACH.
541 rfc2003 contains "deep thoughts" about NET_UNREACH,
542 I believe they are just ether pollution. --ANK
543 */
544 break;
545 }
546 break;
547 case ICMP_TIME_EXCEEDED:
548 if (code != ICMP_EXC_TTL)
549 return 0;
550 break;
551 case ICMP_REDIRECT:
552 break;
553 }
554
555 err = -ENOENT;
556
557 t = ipip6_tunnel_lookup(dev_net(skb->dev),
558 skb->dev,
559 iph->daddr,
560 iph->saddr);
561 if (t == NULL)
562 goto out;
563
564 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
565 ipv4_update_pmtu(skb, dev_net(skb->dev), info,
566 t->dev->ifindex, 0, IPPROTO_IPV6, 0);
567 err = 0;
568 goto out;
569 }
570 if (type == ICMP_REDIRECT) {
571 ipv4_redirect(skb, dev_net(skb->dev), t->dev->ifindex, 0,
572 IPPROTO_IPV6, 0);
573 err = 0;
574 goto out;
575 }
576
577 if (t->parms.iph.daddr == 0)
578 goto out;
579
580 err = 0;
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 int ipip6_rcv(struct sk_buff *skb)
594 {
595 const struct iphdr *iph;
596 struct ip_tunnel *tunnel;
597 int err;
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 goto out;
620 }
621
622 __skb_tunnel_rx(skb, tunnel->dev);
623
624 err = IP_ECN_decapsulate(iph, skb);
625 if (unlikely(err)) {
626 if (log_ecn_error)
627 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
628 &iph->saddr, iph->tos);
629 if (err > 1) {
630 ++tunnel->dev->stats.rx_frame_errors;
631 ++tunnel->dev->stats.rx_errors;
632 goto out;
633 }
634 }
635
636 tstats = this_cpu_ptr(tunnel->dev->tstats);
637 tstats->rx_packets++;
638 tstats->rx_bytes += skb->len;
639
640 netif_rx(skb);
641
642 return 0;
643 }
644
645 /* no tunnel matched, let upstream know, ipsec may handle it */
646 return 1;
647 out:
648 kfree_skb(skb);
649 return 0;
650 }
651
652 /*
653 * Returns the embedded IPv4 address if the IPv6 address
654 * comes from 6rd / 6to4 (RFC 3056) addr space.
655 */
656 static inline
657 __be32 try_6rd(const struct in6_addr *v6dst, struct ip_tunnel *tunnel)
658 {
659 __be32 dst = 0;
660
661 #ifdef CONFIG_IPV6_SIT_6RD
662 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix,
663 tunnel->ip6rd.prefixlen)) {
664 unsigned int pbw0, pbi0;
665 int pbi1;
666 u32 d;
667
668 pbw0 = tunnel->ip6rd.prefixlen >> 5;
669 pbi0 = tunnel->ip6rd.prefixlen & 0x1f;
670
671 d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
672 tunnel->ip6rd.relay_prefixlen;
673
674 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;
675 if (pbi1 > 0)
676 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >>
677 (32 - pbi1);
678
679 dst = tunnel->ip6rd.relay_prefix | htonl(d);
680 }
681 #else
682 if (v6dst->s6_addr16[0] == htons(0x2002)) {
683 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
684 memcpy(&dst, &v6dst->s6_addr16[1], 4);
685 }
686 #endif
687 return dst;
688 }
689
690 /*
691 * This function assumes it is being called from dev_queue_xmit()
692 * and that skb is filled properly by that function.
693 */
694
695 static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
696 struct net_device *dev)
697 {
698 struct ip_tunnel *tunnel = netdev_priv(dev);
699 const struct iphdr *tiph = &tunnel->parms.iph;
700 const struct ipv6hdr *iph6 = ipv6_hdr(skb);
701 u8 tos = tunnel->parms.iph.tos;
702 __be16 df = tiph->frag_off;
703 struct rtable *rt; /* Route to the other host */
704 struct net_device *tdev; /* Device to other host */
705 struct iphdr *iph; /* Our new IP header */
706 unsigned int max_headroom; /* The extra header space needed */
707 __be32 dst = tiph->daddr;
708 struct flowi4 fl4;
709 int mtu;
710 const struct in6_addr *addr6;
711 int addr_type;
712
713 if (skb->protocol != htons(ETH_P_IPV6))
714 goto tx_error;
715
716 if (tos == 1)
717 tos = ipv6_get_dsfield(iph6);
718
719 /* ISATAP (RFC4214) - must come before 6to4 */
720 if (dev->priv_flags & IFF_ISATAP) {
721 struct neighbour *neigh = NULL;
722 bool do_tx_error = false;
723
724 if (skb_dst(skb))
725 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
726
727 if (neigh == NULL) {
728 net_dbg_ratelimited("sit: nexthop == NULL\n");
729 goto tx_error;
730 }
731
732 addr6 = (const struct in6_addr *)&neigh->primary_key;
733 addr_type = ipv6_addr_type(addr6);
734
735 if ((addr_type & IPV6_ADDR_UNICAST) &&
736 ipv6_addr_is_isatap(addr6))
737 dst = addr6->s6_addr32[3];
738 else
739 do_tx_error = true;
740
741 neigh_release(neigh);
742 if (do_tx_error)
743 goto tx_error;
744 }
745
746 if (!dst)
747 dst = try_6rd(&iph6->daddr, tunnel);
748
749 if (!dst) {
750 struct neighbour *neigh = NULL;
751 bool do_tx_error = false;
752
753 if (skb_dst(skb))
754 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
755
756 if (neigh == NULL) {
757 net_dbg_ratelimited("sit: nexthop == NULL\n");
758 goto tx_error;
759 }
760
761 addr6 = (const struct in6_addr *)&neigh->primary_key;
762 addr_type = ipv6_addr_type(addr6);
763
764 if (addr_type == IPV6_ADDR_ANY) {
765 addr6 = &ipv6_hdr(skb)->daddr;
766 addr_type = ipv6_addr_type(addr6);
767 }
768
769 if ((addr_type & IPV6_ADDR_COMPATv4) != 0)
770 dst = addr6->s6_addr32[3];
771 else
772 do_tx_error = true;
773
774 neigh_release(neigh);
775 if (do_tx_error)
776 goto tx_error;
777 }
778
779 rt = ip_route_output_ports(dev_net(dev), &fl4, NULL,
780 dst, tiph->saddr,
781 0, 0,
782 IPPROTO_IPV6, RT_TOS(tos),
783 tunnel->parms.link);
784 if (IS_ERR(rt)) {
785 dev->stats.tx_carrier_errors++;
786 goto tx_error_icmp;
787 }
788 if (rt->rt_type != RTN_UNICAST) {
789 ip_rt_put(rt);
790 dev->stats.tx_carrier_errors++;
791 goto tx_error_icmp;
792 }
793 tdev = rt->dst.dev;
794
795 if (tdev == dev) {
796 ip_rt_put(rt);
797 dev->stats.collisions++;
798 goto tx_error;
799 }
800
801 if (df) {
802 mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr);
803
804 if (mtu < 68) {
805 dev->stats.collisions++;
806 ip_rt_put(rt);
807 goto tx_error;
808 }
809
810 if (mtu < IPV6_MIN_MTU) {
811 mtu = IPV6_MIN_MTU;
812 df = 0;
813 }
814
815 if (tunnel->parms.iph.daddr && skb_dst(skb))
816 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
817
818 if (skb->len > mtu) {
819 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
820 ip_rt_put(rt);
821 goto tx_error;
822 }
823 }
824
825 if (tunnel->err_count > 0) {
826 if (time_before(jiffies,
827 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
828 tunnel->err_count--;
829 dst_link_failure(skb);
830 } else
831 tunnel->err_count = 0;
832 }
833
834 /*
835 * Okay, now see if we can stuff it in the buffer as-is.
836 */
837 max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr);
838
839 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
840 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
841 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
842 if (!new_skb) {
843 ip_rt_put(rt);
844 dev->stats.tx_dropped++;
845 dev_kfree_skb(skb);
846 return NETDEV_TX_OK;
847 }
848 if (skb->sk)
849 skb_set_owner_w(new_skb, skb->sk);
850 dev_kfree_skb(skb);
851 skb = new_skb;
852 iph6 = ipv6_hdr(skb);
853 }
854
855 skb->transport_header = skb->network_header;
856 skb_push(skb, sizeof(struct iphdr));
857 skb_reset_network_header(skb);
858 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
859 IPCB(skb)->flags = 0;
860 skb_dst_drop(skb);
861 skb_dst_set(skb, &rt->dst);
862
863 /*
864 * Push down and install the IPIP header.
865 */
866
867 iph = ip_hdr(skb);
868 iph->version = 4;
869 iph->ihl = sizeof(struct iphdr)>>2;
870 iph->frag_off = df;
871 iph->protocol = IPPROTO_IPV6;
872 iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
873 iph->daddr = fl4.daddr;
874 iph->saddr = fl4.saddr;
875
876 if ((iph->ttl = tiph->ttl) == 0)
877 iph->ttl = iph6->hop_limit;
878
879 iptunnel_xmit(skb, dev);
880 return NETDEV_TX_OK;
881
882 tx_error_icmp:
883 dst_link_failure(skb);
884 tx_error:
885 dev->stats.tx_errors++;
886 dev_kfree_skb(skb);
887 return NETDEV_TX_OK;
888 }
889
890 static void ipip6_tunnel_bind_dev(struct net_device *dev)
891 {
892 struct net_device *tdev = NULL;
893 struct ip_tunnel *tunnel;
894 const struct iphdr *iph;
895 struct flowi4 fl4;
896
897 tunnel = netdev_priv(dev);
898 iph = &tunnel->parms.iph;
899
900 if (iph->daddr) {
901 struct rtable *rt = ip_route_output_ports(dev_net(dev), &fl4, NULL,
902 iph->daddr, iph->saddr,
903 0, 0,
904 IPPROTO_IPV6,
905 RT_TOS(iph->tos),
906 tunnel->parms.link);
907
908 if (!IS_ERR(rt)) {
909 tdev = rt->dst.dev;
910 ip_rt_put(rt);
911 }
912 dev->flags |= IFF_POINTOPOINT;
913 }
914
915 if (!tdev && tunnel->parms.link)
916 tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
917
918 if (tdev) {
919 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
920 dev->mtu = tdev->mtu - sizeof(struct iphdr);
921 if (dev->mtu < IPV6_MIN_MTU)
922 dev->mtu = IPV6_MIN_MTU;
923 }
924 dev->iflink = tunnel->parms.link;
925 }
926
927 static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p)
928 {
929 struct net *net = dev_net(t->dev);
930 struct sit_net *sitn = net_generic(net, sit_net_id);
931
932 ipip6_tunnel_unlink(sitn, t);
933 synchronize_net();
934 t->parms.iph.saddr = p->iph.saddr;
935 t->parms.iph.daddr = p->iph.daddr;
936 memcpy(t->dev->dev_addr, &p->iph.saddr, 4);
937 memcpy(t->dev->broadcast, &p->iph.daddr, 4);
938 ipip6_tunnel_link(sitn, t);
939 t->parms.iph.ttl = p->iph.ttl;
940 t->parms.iph.tos = p->iph.tos;
941 if (t->parms.link != p->link) {
942 t->parms.link = p->link;
943 ipip6_tunnel_bind_dev(t->dev);
944 }
945 netdev_state_change(t->dev);
946 }
947
948 #ifdef CONFIG_IPV6_SIT_6RD
949 static int ipip6_tunnel_update_6rd(struct ip_tunnel *t,
950 struct ip_tunnel_6rd *ip6rd)
951 {
952 struct in6_addr prefix;
953 __be32 relay_prefix;
954
955 if (ip6rd->relay_prefixlen > 32 ||
956 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64)
957 return -EINVAL;
958
959 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen);
960 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix))
961 return -EINVAL;
962 if (ip6rd->relay_prefixlen)
963 relay_prefix = ip6rd->relay_prefix &
964 htonl(0xffffffffUL <<
965 (32 - ip6rd->relay_prefixlen));
966 else
967 relay_prefix = 0;
968 if (relay_prefix != ip6rd->relay_prefix)
969 return -EINVAL;
970
971 t->ip6rd.prefix = prefix;
972 t->ip6rd.relay_prefix = relay_prefix;
973 t->ip6rd.prefixlen = ip6rd->prefixlen;
974 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen;
975 netdev_state_change(t->dev);
976 return 0;
977 }
978 #endif
979
980 static int
981 ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
982 {
983 int err = 0;
984 struct ip_tunnel_parm p;
985 struct ip_tunnel_prl prl;
986 struct ip_tunnel *t;
987 struct net *net = dev_net(dev);
988 struct sit_net *sitn = net_generic(net, sit_net_id);
989 #ifdef CONFIG_IPV6_SIT_6RD
990 struct ip_tunnel_6rd ip6rd;
991 #endif
992
993 switch (cmd) {
994 case SIOCGETTUNNEL:
995 #ifdef CONFIG_IPV6_SIT_6RD
996 case SIOCGET6RD:
997 #endif
998 t = NULL;
999 if (dev == sitn->fb_tunnel_dev) {
1000 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1001 err = -EFAULT;
1002 break;
1003 }
1004 t = ipip6_tunnel_locate(net, &p, 0);
1005 }
1006 if (t == NULL)
1007 t = netdev_priv(dev);
1008
1009 err = -EFAULT;
1010 if (cmd == SIOCGETTUNNEL) {
1011 memcpy(&p, &t->parms, sizeof(p));
1012 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p,
1013 sizeof(p)))
1014 goto done;
1015 #ifdef CONFIG_IPV6_SIT_6RD
1016 } else {
1017 ip6rd.prefix = t->ip6rd.prefix;
1018 ip6rd.relay_prefix = t->ip6rd.relay_prefix;
1019 ip6rd.prefixlen = t->ip6rd.prefixlen;
1020 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;
1021 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd,
1022 sizeof(ip6rd)))
1023 goto done;
1024 #endif
1025 }
1026 err = 0;
1027 break;
1028
1029 case SIOCADDTUNNEL:
1030 case SIOCCHGTUNNEL:
1031 err = -EPERM;
1032 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1033 goto done;
1034
1035 err = -EFAULT;
1036 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1037 goto done;
1038
1039 err = -EINVAL;
1040 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 ||
1041 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
1042 goto done;
1043 if (p.iph.ttl)
1044 p.iph.frag_off |= htons(IP_DF);
1045
1046 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
1047
1048 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1049 if (t != NULL) {
1050 if (t->dev != dev) {
1051 err = -EEXIST;
1052 break;
1053 }
1054 } else {
1055 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
1056 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
1057 err = -EINVAL;
1058 break;
1059 }
1060 t = netdev_priv(dev);
1061 }
1062
1063 ipip6_tunnel_update(t, &p);
1064 }
1065
1066 if (t) {
1067 err = 0;
1068 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
1069 err = -EFAULT;
1070 } else
1071 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1072 break;
1073
1074 case SIOCDELTUNNEL:
1075 err = -EPERM;
1076 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1077 goto done;
1078
1079 if (dev == sitn->fb_tunnel_dev) {
1080 err = -EFAULT;
1081 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1082 goto done;
1083 err = -ENOENT;
1084 if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL)
1085 goto done;
1086 err = -EPERM;
1087 if (t == netdev_priv(sitn->fb_tunnel_dev))
1088 goto done;
1089 dev = t->dev;
1090 }
1091 unregister_netdevice(dev);
1092 err = 0;
1093 break;
1094
1095 case SIOCGETPRL:
1096 err = -EINVAL;
1097 if (dev == sitn->fb_tunnel_dev)
1098 goto done;
1099 err = -ENOENT;
1100 if (!(t = netdev_priv(dev)))
1101 goto done;
1102 err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data);
1103 break;
1104
1105 case SIOCADDPRL:
1106 case SIOCDELPRL:
1107 case SIOCCHGPRL:
1108 err = -EPERM;
1109 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1110 goto done;
1111 err = -EINVAL;
1112 if (dev == sitn->fb_tunnel_dev)
1113 goto done;
1114 err = -EFAULT;
1115 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
1116 goto done;
1117 err = -ENOENT;
1118 if (!(t = netdev_priv(dev)))
1119 goto done;
1120
1121 switch (cmd) {
1122 case SIOCDELPRL:
1123 err = ipip6_tunnel_del_prl(t, &prl);
1124 break;
1125 case SIOCADDPRL:
1126 case SIOCCHGPRL:
1127 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
1128 break;
1129 }
1130 netdev_state_change(dev);
1131 break;
1132
1133 #ifdef CONFIG_IPV6_SIT_6RD
1134 case SIOCADD6RD:
1135 case SIOCCHG6RD:
1136 case SIOCDEL6RD:
1137 err = -EPERM;
1138 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1139 goto done;
1140
1141 err = -EFAULT;
1142 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data,
1143 sizeof(ip6rd)))
1144 goto done;
1145
1146 t = netdev_priv(dev);
1147
1148 if (cmd != SIOCDEL6RD) {
1149 err = ipip6_tunnel_update_6rd(t, &ip6rd);
1150 if (err < 0)
1151 goto done;
1152 } else
1153 ipip6_tunnel_clone_6rd(dev, sitn);
1154
1155 err = 0;
1156 break;
1157 #endif
1158
1159 default:
1160 err = -EINVAL;
1161 }
1162
1163 done:
1164 return err;
1165 }
1166
1167 static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1168 {
1169 if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr))
1170 return -EINVAL;
1171 dev->mtu = new_mtu;
1172 return 0;
1173 }
1174
1175 static const struct net_device_ops ipip6_netdev_ops = {
1176 .ndo_uninit = ipip6_tunnel_uninit,
1177 .ndo_start_xmit = ipip6_tunnel_xmit,
1178 .ndo_do_ioctl = ipip6_tunnel_ioctl,
1179 .ndo_change_mtu = ipip6_tunnel_change_mtu,
1180 .ndo_get_stats64= ipip6_get_stats64,
1181 };
1182
1183 static void ipip6_dev_free(struct net_device *dev)
1184 {
1185 free_percpu(dev->tstats);
1186 free_netdev(dev);
1187 }
1188
1189 static void ipip6_tunnel_setup(struct net_device *dev)
1190 {
1191 dev->netdev_ops = &ipip6_netdev_ops;
1192 dev->destructor = ipip6_dev_free;
1193
1194 dev->type = ARPHRD_SIT;
1195 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
1196 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr);
1197 dev->flags = IFF_NOARP;
1198 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1199 dev->iflink = 0;
1200 dev->addr_len = 4;
1201 dev->features |= NETIF_F_NETNS_LOCAL;
1202 dev->features |= NETIF_F_LLTX;
1203 }
1204
1205 static int ipip6_tunnel_init(struct net_device *dev)
1206 {
1207 struct ip_tunnel *tunnel = netdev_priv(dev);
1208
1209 tunnel->dev = dev;
1210
1211 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
1212 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
1213
1214 ipip6_tunnel_bind_dev(dev);
1215 dev->tstats = alloc_percpu(struct pcpu_tstats);
1216 if (!dev->tstats)
1217 return -ENOMEM;
1218
1219 return 0;
1220 }
1221
1222 static int __net_init ipip6_fb_tunnel_init(struct net_device *dev)
1223 {
1224 struct ip_tunnel *tunnel = netdev_priv(dev);
1225 struct iphdr *iph = &tunnel->parms.iph;
1226 struct net *net = dev_net(dev);
1227 struct sit_net *sitn = net_generic(net, sit_net_id);
1228
1229 tunnel->dev = dev;
1230 strcpy(tunnel->parms.name, dev->name);
1231
1232 iph->version = 4;
1233 iph->protocol = IPPROTO_IPV6;
1234 iph->ihl = 5;
1235 iph->ttl = 64;
1236
1237 dev->tstats = alloc_percpu(struct pcpu_tstats);
1238 if (!dev->tstats)
1239 return -ENOMEM;
1240 dev_hold(dev);
1241 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel);
1242 return 0;
1243 }
1244
1245 static void ipip6_netlink_parms(struct nlattr *data[],
1246 struct ip_tunnel_parm *parms)
1247 {
1248 memset(parms, 0, sizeof(*parms));
1249
1250 parms->iph.version = 4;
1251 parms->iph.protocol = IPPROTO_IPV6;
1252 parms->iph.ihl = 5;
1253 parms->iph.ttl = 64;
1254
1255 if (!data)
1256 return;
1257
1258 if (data[IFLA_IPTUN_LINK])
1259 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1260
1261 if (data[IFLA_IPTUN_LOCAL])
1262 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]);
1263
1264 if (data[IFLA_IPTUN_REMOTE])
1265 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]);
1266
1267 if (data[IFLA_IPTUN_TTL]) {
1268 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
1269 if (parms->iph.ttl)
1270 parms->iph.frag_off = htons(IP_DF);
1271 }
1272
1273 if (data[IFLA_IPTUN_TOS])
1274 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
1275
1276 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
1277 parms->iph.frag_off = htons(IP_DF);
1278
1279 if (data[IFLA_IPTUN_FLAGS])
1280 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]);
1281 }
1282
1283 #ifdef CONFIG_IPV6_SIT_6RD
1284 /* This function returns true when 6RD attributes are present in the nl msg */
1285 static bool ipip6_netlink_6rd_parms(struct nlattr *data[],
1286 struct ip_tunnel_6rd *ip6rd)
1287 {
1288 bool ret = false;
1289 memset(ip6rd, 0, sizeof(*ip6rd));
1290
1291 if (!data)
1292 return ret;
1293
1294 if (data[IFLA_IPTUN_6RD_PREFIX]) {
1295 ret = true;
1296 nla_memcpy(&ip6rd->prefix, data[IFLA_IPTUN_6RD_PREFIX],
1297 sizeof(struct in6_addr));
1298 }
1299
1300 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) {
1301 ret = true;
1302 ip6rd->relay_prefix =
1303 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]);
1304 }
1305
1306 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) {
1307 ret = true;
1308 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]);
1309 }
1310
1311 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) {
1312 ret = true;
1313 ip6rd->relay_prefixlen =
1314 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
1315 }
1316
1317 return ret;
1318 }
1319 #endif
1320
1321 static int ipip6_newlink(struct net *src_net, struct net_device *dev,
1322 struct nlattr *tb[], struct nlattr *data[])
1323 {
1324 struct net *net = dev_net(dev);
1325 struct ip_tunnel *nt;
1326 #ifdef CONFIG_IPV6_SIT_6RD
1327 struct ip_tunnel_6rd ip6rd;
1328 #endif
1329 int err;
1330
1331 nt = netdev_priv(dev);
1332 ipip6_netlink_parms(data, &nt->parms);
1333
1334 if (ipip6_tunnel_locate(net, &nt->parms, 0))
1335 return -EEXIST;
1336
1337 err = ipip6_tunnel_create(dev);
1338 if (err < 0)
1339 return err;
1340
1341 #ifdef CONFIG_IPV6_SIT_6RD
1342 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1343 err = ipip6_tunnel_update_6rd(nt, &ip6rd);
1344 #endif
1345
1346 return err;
1347 }
1348
1349 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[],
1350 struct nlattr *data[])
1351 {
1352 struct ip_tunnel *t;
1353 struct ip_tunnel_parm p;
1354 struct net *net = dev_net(dev);
1355 struct sit_net *sitn = net_generic(net, sit_net_id);
1356 #ifdef CONFIG_IPV6_SIT_6RD
1357 struct ip_tunnel_6rd ip6rd;
1358 #endif
1359
1360 if (dev == sitn->fb_tunnel_dev)
1361 return -EINVAL;
1362
1363 ipip6_netlink_parms(data, &p);
1364
1365 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
1366 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
1367 return -EINVAL;
1368
1369 t = ipip6_tunnel_locate(net, &p, 0);
1370
1371 if (t) {
1372 if (t->dev != dev)
1373 return -EEXIST;
1374 } else
1375 t = netdev_priv(dev);
1376
1377 ipip6_tunnel_update(t, &p);
1378
1379 #ifdef CONFIG_IPV6_SIT_6RD
1380 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1381 return ipip6_tunnel_update_6rd(t, &ip6rd);
1382 #endif
1383
1384 return 0;
1385 }
1386
1387 static size_t ipip6_get_size(const struct net_device *dev)
1388 {
1389 return
1390 /* IFLA_IPTUN_LINK */
1391 nla_total_size(4) +
1392 /* IFLA_IPTUN_LOCAL */
1393 nla_total_size(4) +
1394 /* IFLA_IPTUN_REMOTE */
1395 nla_total_size(4) +
1396 /* IFLA_IPTUN_TTL */
1397 nla_total_size(1) +
1398 /* IFLA_IPTUN_TOS */
1399 nla_total_size(1) +
1400 /* IFLA_IPTUN_PMTUDISC */
1401 nla_total_size(1) +
1402 /* IFLA_IPTUN_FLAGS */
1403 nla_total_size(2) +
1404 #ifdef CONFIG_IPV6_SIT_6RD
1405 /* IFLA_IPTUN_6RD_PREFIX */
1406 nla_total_size(sizeof(struct in6_addr)) +
1407 /* IFLA_IPTUN_6RD_RELAY_PREFIX */
1408 nla_total_size(4) +
1409 /* IFLA_IPTUN_6RD_PREFIXLEN */
1410 nla_total_size(2) +
1411 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */
1412 nla_total_size(2) +
1413 #endif
1414 0;
1415 }
1416
1417 static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1418 {
1419 struct ip_tunnel *tunnel = netdev_priv(dev);
1420 struct ip_tunnel_parm *parm = &tunnel->parms;
1421
1422 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
1423 nla_put_be32(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
1424 nla_put_be32(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
1425 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
1426 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
1427 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
1428 !!(parm->iph.frag_off & htons(IP_DF))) ||
1429 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags))
1430 goto nla_put_failure;
1431
1432 #ifdef CONFIG_IPV6_SIT_6RD
1433 if (nla_put(skb, IFLA_IPTUN_6RD_PREFIX, sizeof(struct in6_addr),
1434 &tunnel->ip6rd.prefix) ||
1435 nla_put_be32(skb, IFLA_IPTUN_6RD_RELAY_PREFIX,
1436 tunnel->ip6rd.relay_prefix) ||
1437 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN,
1438 tunnel->ip6rd.prefixlen) ||
1439 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
1440 tunnel->ip6rd.relay_prefixlen))
1441 goto nla_put_failure;
1442 #endif
1443
1444 return 0;
1445
1446 nla_put_failure:
1447 return -EMSGSIZE;
1448 }
1449
1450 static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = {
1451 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1452 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 },
1453 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 },
1454 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1455 [IFLA_IPTUN_TOS] = { .type = NLA_U8 },
1456 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 },
1457 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 },
1458 #ifdef CONFIG_IPV6_SIT_6RD
1459 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) },
1460 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 },
1461 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 },
1462 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 },
1463 #endif
1464 };
1465
1466 static struct rtnl_link_ops sit_link_ops __read_mostly = {
1467 .kind = "sit",
1468 .maxtype = IFLA_IPTUN_MAX,
1469 .policy = ipip6_policy,
1470 .priv_size = sizeof(struct ip_tunnel),
1471 .setup = ipip6_tunnel_setup,
1472 .newlink = ipip6_newlink,
1473 .changelink = ipip6_changelink,
1474 .get_size = ipip6_get_size,
1475 .fill_info = ipip6_fill_info,
1476 };
1477
1478 static struct xfrm_tunnel sit_handler __read_mostly = {
1479 .handler = ipip6_rcv,
1480 .err_handler = ipip6_err,
1481 .priority = 1,
1482 };
1483
1484 static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head)
1485 {
1486 int prio;
1487
1488 for (prio = 1; prio < 4; prio++) {
1489 int h;
1490 for (h = 0; h < HASH_SIZE; h++) {
1491 struct ip_tunnel *t;
1492
1493 t = rtnl_dereference(sitn->tunnels[prio][h]);
1494 while (t != NULL) {
1495 unregister_netdevice_queue(t->dev, head);
1496 t = rtnl_dereference(t->next);
1497 }
1498 }
1499 }
1500 }
1501
1502 static int __net_init sit_init_net(struct net *net)
1503 {
1504 struct sit_net *sitn = net_generic(net, sit_net_id);
1505 struct ip_tunnel *t;
1506 int err;
1507
1508 sitn->tunnels[0] = sitn->tunnels_wc;
1509 sitn->tunnels[1] = sitn->tunnels_l;
1510 sitn->tunnels[2] = sitn->tunnels_r;
1511 sitn->tunnels[3] = sitn->tunnels_r_l;
1512
1513 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
1514 ipip6_tunnel_setup);
1515 if (!sitn->fb_tunnel_dev) {
1516 err = -ENOMEM;
1517 goto err_alloc_dev;
1518 }
1519 dev_net_set(sitn->fb_tunnel_dev, net);
1520
1521 err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
1522 if (err)
1523 goto err_dev_free;
1524
1525 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
1526
1527 if ((err = register_netdev(sitn->fb_tunnel_dev)))
1528 goto err_reg_dev;
1529
1530 t = netdev_priv(sitn->fb_tunnel_dev);
1531
1532 strcpy(t->parms.name, sitn->fb_tunnel_dev->name);
1533 return 0;
1534
1535 err_reg_dev:
1536 dev_put(sitn->fb_tunnel_dev);
1537 err_dev_free:
1538 ipip6_dev_free(sitn->fb_tunnel_dev);
1539 err_alloc_dev:
1540 return err;
1541 }
1542
1543 static void __net_exit sit_exit_net(struct net *net)
1544 {
1545 struct sit_net *sitn = net_generic(net, sit_net_id);
1546 LIST_HEAD(list);
1547
1548 rtnl_lock();
1549 sit_destroy_tunnels(sitn, &list);
1550 unregister_netdevice_queue(sitn->fb_tunnel_dev, &list);
1551 unregister_netdevice_many(&list);
1552 rtnl_unlock();
1553 }
1554
1555 static struct pernet_operations sit_net_ops = {
1556 .init = sit_init_net,
1557 .exit = sit_exit_net,
1558 .id = &sit_net_id,
1559 .size = sizeof(struct sit_net),
1560 };
1561
1562 static void __exit sit_cleanup(void)
1563 {
1564 rtnl_link_unregister(&sit_link_ops);
1565 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1566
1567 unregister_pernet_device(&sit_net_ops);
1568 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1569 }
1570
1571 static int __init sit_init(void)
1572 {
1573 int err;
1574
1575 pr_info("IPv6 over IPv4 tunneling driver\n");
1576
1577 err = register_pernet_device(&sit_net_ops);
1578 if (err < 0)
1579 return err;
1580 err = xfrm4_tunnel_register(&sit_handler, AF_INET6);
1581 if (err < 0) {
1582 pr_info("%s: can't add protocol\n", __func__);
1583 goto xfrm_tunnel_failed;
1584 }
1585 err = rtnl_link_register(&sit_link_ops);
1586 if (err < 0)
1587 goto rtnl_link_failed;
1588
1589 out:
1590 return err;
1591
1592 rtnl_link_failed:
1593 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1594 xfrm_tunnel_failed:
1595 unregister_pernet_device(&sit_net_ops);
1596 goto out;
1597 }
1598
1599 module_init(sit_init);
1600 module_exit(sit_cleanup);
1601 MODULE_LICENSE("GPL");
1602 MODULE_ALIAS_NETDEV("sit0");
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