projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge branch 'davem-next' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik...
[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 #include <linux/module.h>
21 #include <linux/capability.h>
22 #include <linux/errno.h>
23 #include <linux/types.h>
24 #include <linux/socket.h>
25 #include <linux/sockios.h>
26 #include <linux/net.h>
27 #include <linux/in6.h>
28 #include <linux/netdevice.h>
29 #include <linux/if_arp.h>
30 #include <linux/icmp.h>
31 #include <asm/uaccess.h>
32 #include <linux/init.h>
33 #include <linux/netfilter_ipv4.h>
34 #include <linux/if_ether.h>
35
36 #include <net/sock.h>
37 #include <net/snmp.h>
38
39 #include <net/ipv6.h>
40 #include <net/protocol.h>
41 #include <net/transp_v6.h>
42 #include <net/ip6_fib.h>
43 #include <net/ip6_route.h>
44 #include <net/ndisc.h>
45 #include <net/addrconf.h>
46 #include <net/ip.h>
47 #include <net/udp.h>
48 #include <net/icmp.h>
49 #include <net/ipip.h>
50 #include <net/inet_ecn.h>
51 #include <net/xfrm.h>
52 #include <net/dsfield.h>
53 #include <net/net_namespace.h>
54 #include <net/netns/generic.h>
55
56 /*
57 This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c
58
59 For comments look at net/ipv4/ip_gre.c --ANK
60 */
61
62 #define HASH_SIZE 16
63 #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
64
65 static int ipip6_fb_tunnel_init(struct net_device *dev);
66 static int ipip6_tunnel_init(struct net_device *dev);
67 static void ipip6_tunnel_setup(struct net_device *dev);
68
69 static int sit_net_id;
70 struct sit_net {
71 struct ip_tunnel *tunnels_r_l[HASH_SIZE];
72 struct ip_tunnel *tunnels_r[HASH_SIZE];
73 struct ip_tunnel *tunnels_l[HASH_SIZE];
74 struct ip_tunnel *tunnels_wc[1];
75 struct ip_tunnel **tunnels[4];
76
77 struct net_device *fb_tunnel_dev;
78 };
79
80 static DEFINE_RWLOCK(ipip6_lock);
81
82 static struct ip_tunnel * ipip6_tunnel_lookup(struct net *net,
83 __be32 remote, __be32 local)
84 {
85 unsigned h0 = HASH(remote);
86 unsigned h1 = HASH(local);
87 struct ip_tunnel *t;
88 struct sit_net *sitn = net_generic(net, sit_net_id);
89
90 for (t = sitn->tunnels_r_l[h0^h1]; t; t = t->next) {
91 if (local == t->parms.iph.saddr &&
92 remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
93 return t;
94 }
95 for (t = sitn->tunnels_r[h0]; t; t = t->next) {
96 if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
97 return t;
98 }
99 for (t = sitn->tunnels_l[h1]; t; t = t->next) {
100 if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP))
101 return t;
102 }
103 if ((t = sitn->tunnels_wc[0]) != NULL && (t->dev->flags&IFF_UP))
104 return t;
105 return NULL;
106 }
107
108 static struct ip_tunnel **__ipip6_bucket(struct sit_net *sitn,
109 struct ip_tunnel_parm *parms)
110 {
111 __be32 remote = parms->iph.daddr;
112 __be32 local = parms->iph.saddr;
113 unsigned h = 0;
114 int prio = 0;
115
116 if (remote) {
117 prio |= 2;
118 h ^= HASH(remote);
119 }
120 if (local) {
121 prio |= 1;
122 h ^= HASH(local);
123 }
124 return &sitn->tunnels[prio][h];
125 }
126
127 static inline struct ip_tunnel **ipip6_bucket(struct sit_net *sitn,
128 struct ip_tunnel *t)
129 {
130 return __ipip6_bucket(sitn, &t->parms);
131 }
132
133 static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t)
134 {
135 struct ip_tunnel **tp;
136
137 for (tp = ipip6_bucket(sitn, t); *tp; tp = &(*tp)->next) {
138 if (t == *tp) {
139 write_lock_bh(&ipip6_lock);
140 *tp = t->next;
141 write_unlock_bh(&ipip6_lock);
142 break;
143 }
144 }
145 }
146
147 static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t)
148 {
149 struct ip_tunnel **tp = ipip6_bucket(sitn, t);
150
151 t->next = *tp;
152 write_lock_bh(&ipip6_lock);
153 *tp = t;
154 write_unlock_bh(&ipip6_lock);
155 }
156
157 static struct ip_tunnel * ipip6_tunnel_locate(struct net *net,
158 struct ip_tunnel_parm *parms, int create)
159 {
160 __be32 remote = parms->iph.daddr;
161 __be32 local = parms->iph.saddr;
162 struct ip_tunnel *t, **tp, *nt;
163 struct net_device *dev;
164 char name[IFNAMSIZ];
165 struct sit_net *sitn = net_generic(net, sit_net_id);
166
167 for (tp = __ipip6_bucket(sitn, parms); (t = *tp) != NULL; tp = &t->next) {
168 if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr)
169 return t;
170 }
171 if (!create)
172 goto failed;
173
174 if (parms->name[0])
175 strlcpy(name, parms->name, IFNAMSIZ);
176 else
177 sprintf(name, "sit%%d");
178
179 dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup);
180 if (dev == NULL)
181 return NULL;
182
183 dev_net_set(dev, net);
184
185 if (strchr(name, '%')) {
186 if (dev_alloc_name(dev, name) < 0)
187 goto failed_free;
188 }
189
190 nt = netdev_priv(dev);
191 dev->init = ipip6_tunnel_init;
192 nt->parms = *parms;
193
194 if (parms->i_flags & SIT_ISATAP)
195 dev->priv_flags |= IFF_ISATAP;
196
197 if (register_netdevice(dev) < 0)
198 goto failed_free;
199
200 dev_hold(dev);
201
202 ipip6_tunnel_link(sitn, nt);
203 return nt;
204
205 failed_free:
206 free_netdev(dev);
207 failed:
208 return NULL;
209 }
210
211 static struct ip_tunnel_prl_entry *
212 __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
213 {
214 struct ip_tunnel_prl_entry *p = (struct ip_tunnel_prl_entry *)NULL;
215
216 for (p = t->prl; p; p = p->next)
217 if (p->addr == addr)
218 break;
219 return p;
220
221 }
222
223 static int ipip6_tunnel_get_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
224 {
225 struct ip_tunnel_prl *kp;
226 struct ip_tunnel_prl_entry *prl;
227 unsigned int cmax, c = 0, ca, len;
228 int ret = 0;
229
230 cmax = a->datalen / sizeof(*a);
231 if (cmax > 1 && a->addr != htonl(INADDR_ANY))
232 cmax = 1;
233
234 /* For simple GET or for root users,
235 * we try harder to allocate.
236 */
237 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
238 kcalloc(cmax, sizeof(*kp), GFP_KERNEL) :
239 NULL;
240
241 read_lock(&ipip6_lock);
242
243 ca = t->prl_count < cmax ? t->prl_count : cmax;
244
245 if (!kp) {
246 /* We don't try hard to allocate much memory for
247 * non-root users.
248 * For root users, retry allocating enough memory for
249 * the answer.
250 */
251 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC);
252 if (!kp) {
253 ret = -ENOMEM;
254 goto out;
255 }
256 }
257
258 c = 0;
259 for (prl = t->prl; prl; prl = prl->next) {
260 if (c > cmax)
261 break;
262 if (a->addr != htonl(INADDR_ANY) && prl->addr != a->addr)
263 continue;
264 kp[c].addr = prl->addr;
265 kp[c].flags = prl->flags;
266 c++;
267 if (a->addr != htonl(INADDR_ANY))
268 break;
269 }
270 out:
271 read_unlock(&ipip6_lock);
272
273 len = sizeof(*kp) * c;
274 ret = len ? copy_to_user(a->data, kp, len) : 0;
275
276 kfree(kp);
277 if (ret)
278 return -EFAULT;
279
280 a->datalen = len;
281 return 0;
282 }
283
284 static int
285 ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
286 {
287 struct ip_tunnel_prl_entry *p;
288 int err = 0;
289
290 if (a->addr == htonl(INADDR_ANY))
291 return -EINVAL;
292
293 write_lock(&ipip6_lock);
294
295 for (p = t->prl; p; p = p->next) {
296 if (p->addr == a->addr) {
297 if (chg)
298 goto update;
299 err = -EEXIST;
300 goto out;
301 }
302 }
303
304 if (chg) {
305 err = -ENXIO;
306 goto out;
307 }
308
309 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
310 if (!p) {
311 err = -ENOBUFS;
312 goto out;
313 }
314
315 p->next = t->prl;
316 t->prl = p;
317 t->prl_count++;
318 update:
319 p->addr = a->addr;
320 p->flags = a->flags;
321 out:
322 write_unlock(&ipip6_lock);
323 return err;
324 }
325
326 static int
327 ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
328 {
329 struct ip_tunnel_prl_entry *x, **p;
330 int err = 0;
331
332 write_lock(&ipip6_lock);
333
334 if (a && a->addr != htonl(INADDR_ANY)) {
335 for (p = &t->prl; *p; p = &(*p)->next) {
336 if ((*p)->addr == a->addr) {
337 x = *p;
338 *p = x->next;
339 kfree(x);
340 t->prl_count--;
341 goto out;
342 }
343 }
344 err = -ENXIO;
345 } else {
346 while (t->prl) {
347 x = t->prl;
348 t->prl = t->prl->next;
349 kfree(x);
350 t->prl_count--;
351 }
352 }
353 out:
354 write_unlock(&ipip6_lock);
355 return 0;
356 }
357
358 static int
359 isatap_chksrc(struct sk_buff *skb, struct iphdr *iph, struct ip_tunnel *t)
360 {
361 struct ip_tunnel_prl_entry *p;
362 int ok = 1;
363
364 read_lock(&ipip6_lock);
365 p = __ipip6_tunnel_locate_prl(t, iph->saddr);
366 if (p) {
367 if (p->flags & PRL_DEFAULT)
368 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
369 else
370 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
371 } else {
372 struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
373 if (ipv6_addr_is_isatap(addr6) &&
374 (addr6->s6_addr32[3] == iph->saddr) &&
375 ipv6_chk_prefix(addr6, t->dev))
376 skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
377 else
378 ok = 0;
379 }
380 read_unlock(&ipip6_lock);
381 return ok;
382 }
383
384 static void ipip6_tunnel_uninit(struct net_device *dev)
385 {
386 struct net *net = dev_net(dev);
387 struct sit_net *sitn = net_generic(net, sit_net_id);
388
389 if (dev == sitn->fb_tunnel_dev) {
390 write_lock_bh(&ipip6_lock);
391 sitn->tunnels_wc[0] = NULL;
392 write_unlock_bh(&ipip6_lock);
393 dev_put(dev);
394 } else {
395 ipip6_tunnel_unlink(sitn, netdev_priv(dev));
396 ipip6_tunnel_del_prl(netdev_priv(dev), NULL);
397 dev_put(dev);
398 }
399 }
400
401
402 static int ipip6_err(struct sk_buff *skb, u32 info)
403 {
404
405 /* All the routers (except for Linux) return only
406 8 bytes of packet payload. It means, that precise relaying of
407 ICMP in the real Internet is absolutely infeasible.
408 */
409 struct iphdr *iph = (struct iphdr*)skb->data;
410 const int type = icmp_hdr(skb)->type;
411 const int code = icmp_hdr(skb)->code;
412 struct ip_tunnel *t;
413 int err;
414
415 switch (type) {
416 default:
417 case ICMP_PARAMETERPROB:
418 return 0;
419
420 case ICMP_DEST_UNREACH:
421 switch (code) {
422 case ICMP_SR_FAILED:
423 case ICMP_PORT_UNREACH:
424 /* Impossible event. */
425 return 0;
426 case ICMP_FRAG_NEEDED:
427 /* Soft state for pmtu is maintained by IP core. */
428 return 0;
429 default:
430 /* All others are translated to HOST_UNREACH.
431 rfc2003 contains "deep thoughts" about NET_UNREACH,
432 I believe they are just ether pollution. --ANK
433 */
434 break;
435 }
436 break;
437 case ICMP_TIME_EXCEEDED:
438 if (code != ICMP_EXC_TTL)
439 return 0;
440 break;
441 }
442
443 err = -ENOENT;
444
445 read_lock(&ipip6_lock);
446 t = ipip6_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr);
447 if (t == NULL || t->parms.iph.daddr == 0)
448 goto out;
449
450 err = 0;
451 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
452 goto out;
453
454 if (jiffies - t->err_time < IPTUNNEL_ERR_TIMEO)
455 t->err_count++;
456 else
457 t->err_count = 1;
458 t->err_time = jiffies;
459 out:
460 read_unlock(&ipip6_lock);
461 return err;
462 }
463
464 static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb)
465 {
466 if (INET_ECN_is_ce(iph->tos))
467 IP6_ECN_set_ce(ipv6_hdr(skb));
468 }
469
470 static int ipip6_rcv(struct sk_buff *skb)
471 {
472 struct iphdr *iph;
473 struct ip_tunnel *tunnel;
474
475 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
476 goto out;
477
478 iph = ip_hdr(skb);
479
480 read_lock(&ipip6_lock);
481 if ((tunnel = ipip6_tunnel_lookup(dev_net(skb->dev),
482 iph->saddr, iph->daddr)) != NULL) {
483 secpath_reset(skb);
484 skb->mac_header = skb->network_header;
485 skb_reset_network_header(skb);
486 IPCB(skb)->flags = 0;
487 skb->protocol = htons(ETH_P_IPV6);
488 skb->pkt_type = PACKET_HOST;
489
490 if ((tunnel->dev->priv_flags & IFF_ISATAP) &&
491 !isatap_chksrc(skb, iph, tunnel)) {
492 tunnel->dev->stats.rx_errors++;
493 read_unlock(&ipip6_lock);
494 kfree_skb(skb);
495 return 0;
496 }
497 tunnel->dev->stats.rx_packets++;
498 tunnel->dev->stats.rx_bytes += skb->len;
499 skb->dev = tunnel->dev;
500 dst_release(skb->dst);
501 skb->dst = NULL;
502 nf_reset(skb);
503 ipip6_ecn_decapsulate(iph, skb);
504 netif_rx(skb);
505 read_unlock(&ipip6_lock);
506 return 0;
507 }
508
509 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
510 read_unlock(&ipip6_lock);
511 out:
512 kfree_skb(skb);
513 return 0;
514 }
515
516 /* Returns the embedded IPv4 address if the IPv6 address
517 comes from 6to4 (RFC 3056) addr space */
518
519 static inline __be32 try_6to4(struct in6_addr *v6dst)
520 {
521 __be32 dst = 0;
522
523 if (v6dst->s6_addr16[0] == htons(0x2002)) {
524 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
525 memcpy(&dst, &v6dst->s6_addr16[1], 4);
526 }
527 return dst;
528 }
529
530 /*
531 * This function assumes it is being called from dev_queue_xmit()
532 * and that skb is filled properly by that function.
533 */
534
535 static int ipip6_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
536 {
537 struct ip_tunnel *tunnel = netdev_priv(dev);
538 struct net_device_stats *stats = &tunnel->dev->stats;
539 struct iphdr *tiph = &tunnel->parms.iph;
540 struct ipv6hdr *iph6 = ipv6_hdr(skb);
541 u8 tos = tunnel->parms.iph.tos;
542 struct rtable *rt; /* Route to the other host */
543 struct net_device *tdev; /* Device to other host */
544 struct iphdr *iph; /* Our new IP header */
545 unsigned int max_headroom; /* The extra header space needed */
546 __be32 dst = tiph->daddr;
547 int mtu;
548 struct in6_addr *addr6;
549 int addr_type;
550
551 if (tunnel->recursion++) {
552 stats->collisions++;
553 goto tx_error;
554 }
555
556 if (skb->protocol != htons(ETH_P_IPV6))
557 goto tx_error;
558
559 /* ISATAP (RFC4214) - must come before 6to4 */
560 if (dev->priv_flags & IFF_ISATAP) {
561 struct neighbour *neigh = NULL;
562
563 if (skb->dst)
564 neigh = skb->dst->neighbour;
565
566 if (neigh == NULL) {
567 if (net_ratelimit())
568 printk(KERN_DEBUG "sit: nexthop == NULL\n");
569 goto tx_error;
570 }
571
572 addr6 = (struct in6_addr*)&neigh->primary_key;
573 addr_type = ipv6_addr_type(addr6);
574
575 if ((addr_type & IPV6_ADDR_UNICAST) &&
576 ipv6_addr_is_isatap(addr6))
577 dst = addr6->s6_addr32[3];
578 else
579 goto tx_error;
580 }
581
582 if (!dst)
583 dst = try_6to4(&iph6->daddr);
584
585 if (!dst) {
586 struct neighbour *neigh = NULL;
587
588 if (skb->dst)
589 neigh = skb->dst->neighbour;
590
591 if (neigh == NULL) {
592 if (net_ratelimit())
593 printk(KERN_DEBUG "sit: nexthop == NULL\n");
594 goto tx_error;
595 }
596
597 addr6 = (struct in6_addr*)&neigh->primary_key;
598 addr_type = ipv6_addr_type(addr6);
599
600 if (addr_type == IPV6_ADDR_ANY) {
601 addr6 = &ipv6_hdr(skb)->daddr;
602 addr_type = ipv6_addr_type(addr6);
603 }
604
605 if ((addr_type & IPV6_ADDR_COMPATv4) == 0)
606 goto tx_error_icmp;
607
608 dst = addr6->s6_addr32[3];
609 }
610
611 {
612 struct flowi fl = { .nl_u = { .ip4_u =
613 { .daddr = dst,
614 .saddr = tiph->saddr,
615 .tos = RT_TOS(tos) } },
616 .oif = tunnel->parms.link,
617 .proto = IPPROTO_IPV6 };
618 if (ip_route_output_key(dev_net(dev), &rt, &fl)) {
619 stats->tx_carrier_errors++;
620 goto tx_error_icmp;
621 }
622 }
623 if (rt->rt_type != RTN_UNICAST) {
624 ip_rt_put(rt);
625 stats->tx_carrier_errors++;
626 goto tx_error_icmp;
627 }
628 tdev = rt->u.dst.dev;
629
630 if (tdev == dev) {
631 ip_rt_put(rt);
632 stats->collisions++;
633 goto tx_error;
634 }
635
636 if (tiph->frag_off)
637 mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr);
638 else
639 mtu = skb->dst ? dst_mtu(skb->dst) : dev->mtu;
640
641 if (mtu < 68) {
642 stats->collisions++;
643 ip_rt_put(rt);
644 goto tx_error;
645 }
646 if (mtu < IPV6_MIN_MTU)
647 mtu = IPV6_MIN_MTU;
648 if (tunnel->parms.iph.daddr && skb->dst)
649 skb->dst->ops->update_pmtu(skb->dst, mtu);
650
651 if (skb->len > mtu) {
652 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev);
653 ip_rt_put(rt);
654 goto tx_error;
655 }
656
657 if (tunnel->err_count > 0) {
658 if (jiffies - tunnel->err_time < IPTUNNEL_ERR_TIMEO) {
659 tunnel->err_count--;
660 dst_link_failure(skb);
661 } else
662 tunnel->err_count = 0;
663 }
664
665 /*
666 * Okay, now see if we can stuff it in the buffer as-is.
667 */
668 max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr);
669
670 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
671 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
672 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
673 if (!new_skb) {
674 ip_rt_put(rt);
675 stats->tx_dropped++;
676 dev_kfree_skb(skb);
677 tunnel->recursion--;
678 return 0;
679 }
680 if (skb->sk)
681 skb_set_owner_w(new_skb, skb->sk);
682 dev_kfree_skb(skb);
683 skb = new_skb;
684 iph6 = ipv6_hdr(skb);
685 }
686
687 skb->transport_header = skb->network_header;
688 skb_push(skb, sizeof(struct iphdr));
689 skb_reset_network_header(skb);
690 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
691 IPCB(skb)->flags = 0;
692 dst_release(skb->dst);
693 skb->dst = &rt->u.dst;
694
695 /*
696 * Push down and install the IPIP header.
697 */
698
699 iph = ip_hdr(skb);
700 iph->version = 4;
701 iph->ihl = sizeof(struct iphdr)>>2;
702 if (mtu > IPV6_MIN_MTU)
703 iph->frag_off = htons(IP_DF);
704 else
705 iph->frag_off = 0;
706
707 iph->protocol = IPPROTO_IPV6;
708 iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
709 iph->daddr = rt->rt_dst;
710 iph->saddr = rt->rt_src;
711
712 if ((iph->ttl = tiph->ttl) == 0)
713 iph->ttl = iph6->hop_limit;
714
715 nf_reset(skb);
716
717 IPTUNNEL_XMIT();
718 tunnel->recursion--;
719 return 0;
720
721 tx_error_icmp:
722 dst_link_failure(skb);
723 tx_error:
724 stats->tx_errors++;
725 dev_kfree_skb(skb);
726 tunnel->recursion--;
727 return 0;
728 }
729
730 static void ipip6_tunnel_bind_dev(struct net_device *dev)
731 {
732 struct net_device *tdev = NULL;
733 struct ip_tunnel *tunnel;
734 struct iphdr *iph;
735
736 tunnel = netdev_priv(dev);
737 iph = &tunnel->parms.iph;
738
739 if (iph->daddr) {
740 struct flowi fl = { .nl_u = { .ip4_u =
741 { .daddr = iph->daddr,
742 .saddr = iph->saddr,
743 .tos = RT_TOS(iph->tos) } },
744 .oif = tunnel->parms.link,
745 .proto = IPPROTO_IPV6 };
746 struct rtable *rt;
747 if (!ip_route_output_key(dev_net(dev), &rt, &fl)) {
748 tdev = rt->u.dst.dev;
749 ip_rt_put(rt);
750 }
751 dev->flags |= IFF_POINTOPOINT;
752 }
753
754 if (!tdev && tunnel->parms.link)
755 tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
756
757 if (tdev) {
758 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
759 dev->mtu = tdev->mtu - sizeof(struct iphdr);
760 if (dev->mtu < IPV6_MIN_MTU)
761 dev->mtu = IPV6_MIN_MTU;
762 }
763 dev->iflink = tunnel->parms.link;
764 }
765
766 static int
767 ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
768 {
769 int err = 0;
770 struct ip_tunnel_parm p;
771 struct ip_tunnel_prl prl;
772 struct ip_tunnel *t;
773 struct net *net = dev_net(dev);
774 struct sit_net *sitn = net_generic(net, sit_net_id);
775
776 switch (cmd) {
777 case SIOCGETTUNNEL:
778 t = NULL;
779 if (dev == sitn->fb_tunnel_dev) {
780 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
781 err = -EFAULT;
782 break;
783 }
784 t = ipip6_tunnel_locate(net, &p, 0);
785 }
786 if (t == NULL)
787 t = netdev_priv(dev);
788 memcpy(&p, &t->parms, sizeof(p));
789 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
790 err = -EFAULT;
791 break;
792
793 case SIOCADDTUNNEL:
794 case SIOCCHGTUNNEL:
795 err = -EPERM;
796 if (!capable(CAP_NET_ADMIN))
797 goto done;
798
799 err = -EFAULT;
800 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
801 goto done;
802
803 err = -EINVAL;
804 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 ||
805 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
806 goto done;
807 if (p.iph.ttl)
808 p.iph.frag_off |= htons(IP_DF);
809
810 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
811
812 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
813 if (t != NULL) {
814 if (t->dev != dev) {
815 err = -EEXIST;
816 break;
817 }
818 } else {
819 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
820 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
821 err = -EINVAL;
822 break;
823 }
824 t = netdev_priv(dev);
825 ipip6_tunnel_unlink(sitn, t);
826 t->parms.iph.saddr = p.iph.saddr;
827 t->parms.iph.daddr = p.iph.daddr;
828 memcpy(dev->dev_addr, &p.iph.saddr, 4);
829 memcpy(dev->broadcast, &p.iph.daddr, 4);
830 ipip6_tunnel_link(sitn, t);
831 netdev_state_change(dev);
832 }
833 }
834
835 if (t) {
836 err = 0;
837 if (cmd == SIOCCHGTUNNEL) {
838 t->parms.iph.ttl = p.iph.ttl;
839 t->parms.iph.tos = p.iph.tos;
840 if (t->parms.link != p.link) {
841 t->parms.link = p.link;
842 ipip6_tunnel_bind_dev(dev);
843 netdev_state_change(dev);
844 }
845 }
846 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
847 err = -EFAULT;
848 } else
849 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
850 break;
851
852 case SIOCDELTUNNEL:
853 err = -EPERM;
854 if (!capable(CAP_NET_ADMIN))
855 goto done;
856
857 if (dev == sitn->fb_tunnel_dev) {
858 err = -EFAULT;
859 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
860 goto done;
861 err = -ENOENT;
862 if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL)
863 goto done;
864 err = -EPERM;
865 if (t == netdev_priv(sitn->fb_tunnel_dev))
866 goto done;
867 dev = t->dev;
868 }
869 unregister_netdevice(dev);
870 err = 0;
871 break;
872
873 case SIOCGETPRL:
874 case SIOCADDPRL:
875 case SIOCDELPRL:
876 case SIOCCHGPRL:
877 err = -EPERM;
878 if (cmd != SIOCGETPRL && !capable(CAP_NET_ADMIN))
879 goto done;
880 err = -EINVAL;
881 if (dev == sitn->fb_tunnel_dev)
882 goto done;
883 err = -EFAULT;
884 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
885 goto done;
886 err = -ENOENT;
887 if (!(t = netdev_priv(dev)))
888 goto done;
889
890 switch (cmd) {
891 case SIOCGETPRL:
892 err = ipip6_tunnel_get_prl(t, &prl);
893 if (!err && copy_to_user(ifr->ifr_ifru.ifru_data,
894 &prl, sizeof(prl)))
895 err = -EFAULT;
896 break;
897 case SIOCDELPRL:
898 err = ipip6_tunnel_del_prl(t, &prl);
899 break;
900 case SIOCADDPRL:
901 case SIOCCHGPRL:
902 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
903 break;
904 }
905 if (cmd != SIOCGETPRL)
906 netdev_state_change(dev);
907 break;
908
909 default:
910 err = -EINVAL;
911 }
912
913 done:
914 return err;
915 }
916
917 static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
918 {
919 if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr))
920 return -EINVAL;
921 dev->mtu = new_mtu;
922 return 0;
923 }
924
925 static void ipip6_tunnel_setup(struct net_device *dev)
926 {
927 dev->uninit = ipip6_tunnel_uninit;
928 dev->destructor = free_netdev;
929 dev->hard_start_xmit = ipip6_tunnel_xmit;
930 dev->do_ioctl = ipip6_tunnel_ioctl;
931 dev->change_mtu = ipip6_tunnel_change_mtu;
932
933 dev->type = ARPHRD_SIT;
934 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
935 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr);
936 dev->flags = IFF_NOARP;
937 dev->iflink = 0;
938 dev->addr_len = 4;
939 dev->features |= NETIF_F_NETNS_LOCAL;
940 }
941
942 static int ipip6_tunnel_init(struct net_device *dev)
943 {
944 struct ip_tunnel *tunnel;
945
946 tunnel = netdev_priv(dev);
947
948 tunnel->dev = dev;
949 strcpy(tunnel->parms.name, dev->name);
950
951 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
952 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
953
954 ipip6_tunnel_bind_dev(dev);
955
956 return 0;
957 }
958
959 static int ipip6_fb_tunnel_init(struct net_device *dev)
960 {
961 struct ip_tunnel *tunnel = netdev_priv(dev);
962 struct iphdr *iph = &tunnel->parms.iph;
963 struct net *net = dev_net(dev);
964 struct sit_net *sitn = net_generic(net, sit_net_id);
965
966 tunnel->dev = dev;
967 strcpy(tunnel->parms.name, dev->name);
968
969 iph->version = 4;
970 iph->protocol = IPPROTO_IPV6;
971 iph->ihl = 5;
972 iph->ttl = 64;
973
974 dev_hold(dev);
975 sitn->tunnels_wc[0] = tunnel;
976 return 0;
977 }
978
979 static struct xfrm_tunnel sit_handler = {
980 .handler = ipip6_rcv,
981 .err_handler = ipip6_err,
982 .priority = 1,
983 };
984
985 static void sit_destroy_tunnels(struct sit_net *sitn)
986 {
987 int prio;
988
989 for (prio = 1; prio < 4; prio++) {
990 int h;
991 for (h = 0; h < HASH_SIZE; h++) {
992 struct ip_tunnel *t;
993 while ((t = sitn->tunnels[prio][h]) != NULL)
994 unregister_netdevice(t->dev);
995 }
996 }
997 }
998
999 static int sit_init_net(struct net *net)
1000 {
1001 int err;
1002 struct sit_net *sitn;
1003
1004 err = -ENOMEM;
1005 sitn = kzalloc(sizeof(struct sit_net), GFP_KERNEL);
1006 if (sitn == NULL)
1007 goto err_alloc;
1008
1009 err = net_assign_generic(net, sit_net_id, sitn);
1010 if (err < 0)
1011 goto err_assign;
1012
1013 sitn->tunnels[0] = sitn->tunnels_wc;
1014 sitn->tunnels[1] = sitn->tunnels_l;
1015 sitn->tunnels[2] = sitn->tunnels_r;
1016 sitn->tunnels[3] = sitn->tunnels_r_l;
1017
1018 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
1019 ipip6_tunnel_setup);
1020 if (!sitn->fb_tunnel_dev) {
1021 err = -ENOMEM;
1022 goto err_alloc_dev;
1023 }
1024
1025 sitn->fb_tunnel_dev->init = ipip6_fb_tunnel_init;
1026 dev_net_set(sitn->fb_tunnel_dev, net);
1027
1028 if ((err = register_netdev(sitn->fb_tunnel_dev)))
1029 goto err_reg_dev;
1030
1031 return 0;
1032
1033 err_reg_dev:
1034 free_netdev(sitn->fb_tunnel_dev);
1035 err_alloc_dev:
1036 /* nothing */
1037 err_assign:
1038 kfree(sitn);
1039 err_alloc:
1040 return err;
1041 }
1042
1043 static void sit_exit_net(struct net *net)
1044 {
1045 struct sit_net *sitn;
1046
1047 sitn = net_generic(net, sit_net_id);
1048 rtnl_lock();
1049 sit_destroy_tunnels(sitn);
1050 unregister_netdevice(sitn->fb_tunnel_dev);
1051 rtnl_unlock();
1052 kfree(sitn);
1053 }
1054
1055 static struct pernet_operations sit_net_ops = {
1056 .init = sit_init_net,
1057 .exit = sit_exit_net,
1058 };
1059
1060 static void __exit sit_cleanup(void)
1061 {
1062 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1063
1064 unregister_pernet_gen_device(sit_net_id, &sit_net_ops);
1065 }
1066
1067 static int __init sit_init(void)
1068 {
1069 int err;
1070
1071 printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n");
1072
1073 if (xfrm4_tunnel_register(&sit_handler, AF_INET6) < 0) {
1074 printk(KERN_INFO "sit init: Can't add protocol\n");
1075 return -EAGAIN;
1076 }
1077
1078 err = register_pernet_gen_device(&sit_net_id, &sit_net_ops);
1079 if (err < 0)
1080 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1081
1082 return err;
1083 }
1084
1085 module_init(sit_init);
1086 module_exit(sit_cleanup);
1087 MODULE_LICENSE("GPL");
1088 MODULE_ALIAS("sit0");
Linux kernel - Deliverables
This page took 0.071685 seconds and 5 git commands to generate.