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[AF_KEY]: Fix oops by converting to proc_net_*().
[net-next-2.6.git] / net / ipv6 / sit.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT)
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * $Id: sit.c,v 1.53 2001/09/25 05:09:53 davem Exp $
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 *
16 * Changes:
17 * Roger Venning <r.venning@telstra.com>: 6to4 support
18 * Nate Thompson <nate@thebog.net>: 6to4 support
c7dc89c0 19 * Fred L. Templin <fltemplin@acm.org>: isatap support
1da177e4
LT		 20 */
21
1da177e4 22#include <linux/module.h>
4fc268d2 23#include <linux/capability.h>
1da177e4
LT		 24#include <linux/errno.h>
25#include <linux/types.h>
26#include <linux/socket.h>
27#include <linux/sockios.h>
1da177e4
LT		 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 <asm/uaccess.h>
34#include <linux/init.h>
35#include <linux/netfilter_ipv4.h>
46f25dff 36#include <linux/if_ether.h>
1da177e4
LT		 37
38#include <net/sock.h>
39#include <net/snmp.h>
40
41#include <net/ipv6.h>
42#include <net/protocol.h>
43#include <net/transp_v6.h>
44#include <net/ip6_fib.h>
45#include <net/ip6_route.h>
46#include <net/ndisc.h>
47#include <net/addrconf.h>
48#include <net/ip.h>
49#include <net/udp.h>
50#include <net/icmp.h>
51#include <net/ipip.h>
52#include <net/inet_ecn.h>
53#include <net/xfrm.h>
54#include <net/dsfield.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
e69a4adc 63#define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
1da177e4
LT		 64
65static int ipip6_fb_tunnel_init(struct net_device *dev);
66static int ipip6_tunnel_init(struct net_device *dev);
67static void ipip6_tunnel_setup(struct net_device *dev);
68
69static struct net_device *ipip6_fb_tunnel_dev;
70
71static struct ip_tunnel *tunnels_r_l[HASH_SIZE];
72static struct ip_tunnel *tunnels_r[HASH_SIZE];
73static struct ip_tunnel *tunnels_l[HASH_SIZE];
74static struct ip_tunnel *tunnels_wc[1];
75static struct ip_tunnel **tunnels[4] = { tunnels_wc, tunnels_l, tunnels_r, tunnels_r_l };
76
77static DEFINE_RWLOCK(ipip6_lock);
78
e69a4adc 79static struct ip_tunnel * ipip6_tunnel_lookup(__be32 remote, __be32 local)
1da177e4
LT		 80{
81 unsigned h0 = HASH(remote);
82 unsigned h1 = HASH(local);
83 struct ip_tunnel *t;
84
85 for (t = tunnels_r_l[h0^h1]; t; t = t->next) {
86 if (local == t->parms.iph.saddr &&
87 remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
88 return t;
89 }
90 for (t = tunnels_r[h0]; t; t = t->next) {
91 if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
92 return t;
93 }
94 for (t = tunnels_l[h1]; t; t = t->next) {
95 if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP))
96 return t;
97 }
98 if ((t = tunnels_wc[0]) != NULL && (t->dev->flags&IFF_UP))
99 return t;
100 return NULL;
101}
102
420fe234 103static struct ip_tunnel **__ipip6_bucket(struct ip_tunnel_parm *parms)
1da177e4 104{
420fe234
YH		 105 __be32 remote = parms->iph.daddr;
106 __be32 local = parms->iph.saddr;
1da177e4
LT		 107 unsigned h = 0;
108 int prio = 0;
109
110 if (remote) {
111 prio |= 2;
112 h ^= HASH(remote);
113 }
114 if (local) {
115 prio |= 1;
116 h ^= HASH(local);
117 }
118 return &tunnels[prio][h];
119}
120
420fe234
YH		 121static inline struct ip_tunnel **ipip6_bucket(struct ip_tunnel *t)
122{
123 return __ipip6_bucket(&t->parms);
124}
125
1da177e4
LT		 126static void ipip6_tunnel_unlink(struct ip_tunnel *t)
127{
128 struct ip_tunnel **tp;
129
130 for (tp = ipip6_bucket(t); *tp; tp = &(*tp)->next) {
131 if (t == *tp) {
132 write_lock_bh(&ipip6_lock);
133 *tp = t->next;
134 write_unlock_bh(&ipip6_lock);
135 break;
136 }
137 }
138}
139
140static void ipip6_tunnel_link(struct ip_tunnel *t)
141{
142 struct ip_tunnel **tp = ipip6_bucket(t);
143
144 t->next = *tp;
145 write_lock_bh(&ipip6_lock);
146 *tp = t;
147 write_unlock_bh(&ipip6_lock);
148}
149
150static struct ip_tunnel * ipip6_tunnel_locate(struct ip_tunnel_parm *parms, int create)
151{
e69a4adc
AV		 152 __be32 remote = parms->iph.daddr;
153 __be32 local = parms->iph.saddr;
1da177e4
LT		 154 struct ip_tunnel *t, **tp, *nt;
155 struct net_device *dev;
1da177e4
LT		 156 char name[IFNAMSIZ];
157
420fe234 158 for (tp = __ipip6_bucket(parms); (t = *tp) != NULL; tp = &t->next) {
1da177e4
LT		 159 if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr)
160 return t;
161 }
162 if (!create)
163 goto failed;
164
165 if (parms->name[0])
166 strlcpy(name, parms->name, IFNAMSIZ);
34cc7ba6
PE		 167 else
168 sprintf(name, "sit%%d");
1da177e4
LT		 169
170 dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup);
171 if (dev == NULL)
172 return NULL;
173
2941a486 174 nt = netdev_priv(dev);
1da177e4
LT		 175 dev->init = ipip6_tunnel_init;
176 nt->parms = *parms;
177
c7dc89c0
FT		 178 if (parms->i_flags & SIT_ISATAP)
179 dev->priv_flags |= IFF_ISATAP;
180
1da177e4
LT		 181 if (register_netdevice(dev) < 0) {
182 free_netdev(dev);
183 goto failed;
184 }
185
186 dev_hold(dev);
187
188 ipip6_tunnel_link(nt);
1da177e4
LT		 189 return nt;
190
191failed:
192 return NULL;
193}
194
195static void ipip6_tunnel_uninit(struct net_device *dev)
196{
197 if (dev == ipip6_fb_tunnel_dev) {
198 write_lock_bh(&ipip6_lock);
199 tunnels_wc[0] = NULL;
200 write_unlock_bh(&ipip6_lock);
201 dev_put(dev);
202 } else {
2941a486 203 ipip6_tunnel_unlink(netdev_priv(dev));
1da177e4
LT		 204 dev_put(dev);
205 }
206}
207
208
c73cb5a2 209static int ipip6_err(struct sk_buff *skb, u32 info)
1da177e4
LT		 210{
211#ifndef I_WISH_WORLD_WERE_PERFECT
212
213/* It is not :-( All the routers (except for Linux) return only
214 8 bytes of packet payload. It means, that precise relaying of
215 ICMP in the real Internet is absolutely infeasible.
216 */
217 struct iphdr *iph = (struct iphdr*)skb->data;
88c7664f
ACM		 218 const int type = icmp_hdr(skb)->type;
219 const int code = icmp_hdr(skb)->code;
1da177e4 220 struct ip_tunnel *t;
c73cb5a2 221 int err;
1da177e4
LT		 222
223 switch (type) {
224 default:
225 case ICMP_PARAMETERPROB:
c73cb5a2 226 return 0;
1da177e4
LT		 227
228 case ICMP_DEST_UNREACH:
229 switch (code) {
230 case ICMP_SR_FAILED:
231 case ICMP_PORT_UNREACH:
232 /* Impossible event. */
c73cb5a2 233 return 0;
1da177e4
LT		 234 case ICMP_FRAG_NEEDED:
235 /* Soft state for pmtu is maintained by IP core. */
c73cb5a2 236 return 0;
1da177e4
LT		 237 default:
238 /* All others are translated to HOST_UNREACH.
239 rfc2003 contains "deep thoughts" about NET_UNREACH,
240 I believe they are just ether pollution. --ANK
241 */
242 break;
243 }
244 break;
245 case ICMP_TIME_EXCEEDED:
246 if (code != ICMP_EXC_TTL)
c73cb5a2 247 return 0;
1da177e4
LT		 248 break;
249 }
250
c73cb5a2
KM		 251 err = -ENOENT;
252
1da177e4
LT		 253 read_lock(&ipip6_lock);
254 t = ipip6_tunnel_lookup(iph->daddr, iph->saddr);
255 if (t == NULL || t->parms.iph.daddr == 0)
256 goto out;
c73cb5a2
KM		 257
258 err = 0;
1da177e4
LT		 259 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
260 goto out;
261
262 if (jiffies - t->err_time < IPTUNNEL_ERR_TIMEO)
263 t->err_count++;
264 else
265 t->err_count = 1;
266 t->err_time = jiffies;
267out:
268 read_unlock(&ipip6_lock);
c73cb5a2 269 return err;
1da177e4
LT		 270#else
271 struct iphdr *iph = (struct iphdr*)dp;
272 int hlen = iph->ihl<<2;
273 struct ipv6hdr *iph6;
88c7664f
ACM		 274 const int type = icmp_hdr(skb)->type;
275 const int code = icmp_hdr(skb)->code;
1da177e4
LT		 276 int rel_type = 0;
277 int rel_code = 0;
278 int rel_info = 0;
279 struct sk_buff *skb2;
280 struct rt6_info *rt6i;
281
282 if (len < hlen + sizeof(struct ipv6hdr))
283 return;
284 iph6 = (struct ipv6hdr*)(dp + hlen);
285
286 switch (type) {
287 default:
288 return;
289 case ICMP_PARAMETERPROB:
88c7664f 290 if (icmp_hdr(skb)->un.gateway < hlen)
1da177e4
LT		 291 return;
292
293 /* So... This guy found something strange INSIDE encapsulated
294 packet. Well, he is fool, but what can we do ?
295 */
296 rel_type = ICMPV6_PARAMPROB;
88c7664f 297 rel_info = icmp_hdr(skb)->un.gateway - hlen;
1da177e4
LT		 298 break;
299
300 case ICMP_DEST_UNREACH:
301 switch (code) {
302 case ICMP_SR_FAILED:
303 case ICMP_PORT_UNREACH:
304 /* Impossible event. */
305 return;
306 case ICMP_FRAG_NEEDED:
307 /* Too complicated case ... */
308 return;
309 default:
310 /* All others are translated to HOST_UNREACH.
311 rfc2003 contains "deep thoughts" about NET_UNREACH,
312 I believe, it is just ether pollution. --ANK
313 */
314 rel_type = ICMPV6_DEST_UNREACH;
315 rel_code = ICMPV6_ADDR_UNREACH;
316 break;
317 }
318 break;
319 case ICMP_TIME_EXCEEDED:
320 if (code != ICMP_EXC_TTL)
321 return;
322 rel_type = ICMPV6_TIME_EXCEED;
323 rel_code = ICMPV6_EXC_HOPLIMIT;
324 break;
325 }
326
327 /* Prepare fake skb to feed it to icmpv6_send */
328 skb2 = skb_clone(skb, GFP_ATOMIC);
329 if (skb2 == NULL)
c73cb5a2 330 return 0;
1da177e4
LT		 331 dst_release(skb2->dst);
332 skb2->dst = NULL;
333 skb_pull(skb2, skb->data - (u8*)iph6);
c1d2bbe1 334 skb_reset_network_header(skb2);
1da177e4
LT		 335
336 /* Try to guess incoming interface */
337 rt6i = rt6_lookup(&iph6->saddr, NULL, NULL, 0);
338 if (rt6i && rt6i->rt6i_dev) {
339 skb2->dev = rt6i->rt6i_dev;
340
341 rt6i = rt6_lookup(&iph6->daddr, &iph6->saddr, NULL, 0);
342
343 if (rt6i && rt6i->rt6i_dev && rt6i->rt6i_dev->type == ARPHRD_SIT) {
2941a486 344 struct ip_tunnel *t = netdev_priv(rt6i->rt6i_dev);
1da177e4
LT		 345 if (rel_type == ICMPV6_TIME_EXCEED && t->parms.iph.ttl) {
346 rel_type = ICMPV6_DEST_UNREACH;
347 rel_code = ICMPV6_ADDR_UNREACH;
348 }
349 icmpv6_send(skb2, rel_type, rel_code, rel_info, skb2->dev);
350 }
351 }
352 kfree_skb(skb2);
c73cb5a2 353 return 0;
1da177e4
LT		 354#endif
355}
356
357static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb)
358{
359 if (INET_ECN_is_ce(iph->tos))
0660e03f 360 IP6_ECN_set_ce(ipv6_hdr(skb));
1da177e4
LT		 361}
362
c7dc89c0
FT		 363/* ISATAP (RFC4214) - check source address */
364static int
365isatap_srcok(struct sk_buff *skb, struct iphdr *iph, struct net_device *dev)
366{
367 struct neighbour *neigh;
368 struct dst_entry *dst;
369 struct rt6_info *rt;
370 struct flowi fl;
371 struct in6_addr *addr6;
372 struct in6_addr rtr;
373 struct ipv6hdr *iph6;
374 int ok = 0;
375
376 /* from onlink default router */
377 ipv6_addr_set(&rtr, htonl(0xFE800000), 0, 0, 0);
378 ipv6_isatap_eui64(rtr.s6_addr + 8, iph->saddr);
379 if ((rt = rt6_get_dflt_router(&rtr, dev))) {
380 dst_release(&rt->u.dst);
381 return 1;
382 }
383
384 iph6 = ipv6_hdr(skb);
385 memset(&fl, 0, sizeof(fl));
386 fl.proto = iph6->nexthdr;
387 ipv6_addr_copy(&fl.fl6_dst, &iph6->saddr);
388 fl.oif = dev->ifindex;
389 security_skb_classify_flow(skb, &fl);
390
391 dst = ip6_route_output(NULL, &fl);
392 if (!dst->error && (dst->dev == dev) && (neigh = dst->neighbour)) {
393
394 addr6 = (struct in6_addr*)&neigh->primary_key;
395
396 /* from correct previous hop */
397 if (ipv6_addr_is_isatap(addr6) &&
398 (addr6->s6_addr32[3] == iph->saddr))
399 ok = 1;
400 }
401 dst_release(dst);
402 return ok;
403}
404
1da177e4
LT		 405static int ipip6_rcv(struct sk_buff *skb)
406{
407 struct iphdr *iph;
408 struct ip_tunnel *tunnel;
409
410 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
411 goto out;
412
eddc9ec5 413 iph = ip_hdr(skb);
1da177e4
LT		 414
415 read_lock(&ipip6_lock);
416 if ((tunnel = ipip6_tunnel_lookup(iph->saddr, iph->daddr)) != NULL) {
417 secpath_reset(skb);
b0e380b1 418 skb->mac_header = skb->network_header;
c1d2bbe1 419 skb_reset_network_header(skb);
8cdfab8a 420 IPCB(skb)->flags = 0;
1da177e4
LT		 421 skb->protocol = htons(ETH_P_IPV6);
422 skb->pkt_type = PACKET_HOST;
c7dc89c0
FT		 423
424 if ((tunnel->dev->priv_flags & IFF_ISATAP) &&
425 !isatap_srcok(skb, iph, tunnel->dev)) {
426 tunnel->stat.rx_errors++;
427 read_unlock(&ipip6_lock);
428 kfree_skb(skb);
429 return 0;
430 }
1da177e4
LT		 431 tunnel->stat.rx_packets++;
432 tunnel->stat.rx_bytes += skb->len;
433 skb->dev = tunnel->dev;
434 dst_release(skb->dst);
435 skb->dst = NULL;
436 nf_reset(skb);
437 ipip6_ecn_decapsulate(iph, skb);
438 netif_rx(skb);
439 read_unlock(&ipip6_lock);
440 return 0;
441 }
442
45af08be 443 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
1da177e4
LT		 444 kfree_skb(skb);
445 read_unlock(&ipip6_lock);
446out:
447 return 0;
448}
449
450/* Returns the embedded IPv4 address if the IPv6 address
451 comes from 6to4 (RFC 3056) addr space */
452
e69a4adc 453static inline __be32 try_6to4(struct in6_addr *v6dst)
1da177e4 454{
e69a4adc 455 __be32 dst = 0;
1da177e4
LT		 456
457 if (v6dst->s6_addr16[0] == htons(0x2002)) {
1ab1457c 458 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
1da177e4
LT		 459 memcpy(&dst, &v6dst->s6_addr16[1], 4);
460 }
461 return dst;
462}
463
464/*
465 * This function assumes it is being called from dev_queue_xmit()
466 * and that skb is filled properly by that function.
467 */
468
469static int ipip6_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
470{
2941a486 471 struct ip_tunnel *tunnel = netdev_priv(dev);
1da177e4
LT		 472 struct net_device_stats *stats = &tunnel->stat;
473 struct iphdr *tiph = &tunnel->parms.iph;
0660e03f 474 struct ipv6hdr *iph6 = ipv6_hdr(skb);
1da177e4
LT		 475 u8 tos = tunnel->parms.iph.tos;
476 struct rtable *rt; /* Route to the other host */
477 struct net_device *tdev; /* Device to other host */
478 struct iphdr *iph; /* Our new IP header */
c2636b4d 479 unsigned int max_headroom; /* The extra header space needed */
e69a4adc 480 __be32 dst = tiph->daddr;
1da177e4 481 int mtu;
1ab1457c 482 struct in6_addr *addr6;
1da177e4
LT		 483 int addr_type;
484
485 if (tunnel->recursion++) {
486 tunnel->stat.collisions++;
487 goto tx_error;
488 }
489
490 if (skb->protocol != htons(ETH_P_IPV6))
491 goto tx_error;
492
c7dc89c0
FT		 493 /* ISATAP (RFC4214) - must come before 6to4 */
494 if (dev->priv_flags & IFF_ISATAP) {
495 struct neighbour *neigh = NULL;
496
497 if (skb->dst)
498 neigh = skb->dst->neighbour;
499
500 if (neigh == NULL) {
501 if (net_ratelimit())
502 printk(KERN_DEBUG "sit: nexthop == NULL\n");
503 goto tx_error;
504 }
505
506 addr6 = (struct in6_addr*)&neigh->primary_key;
507 addr_type = ipv6_addr_type(addr6);
508
509 if ((addr_type & IPV6_ADDR_UNICAST) &&
510 ipv6_addr_is_isatap(addr6))
511 dst = addr6->s6_addr32[3];
512 else
513 goto tx_error;
514 }
515
1da177e4
LT		 516 if (!dst)
517 dst = try_6to4(&iph6->daddr);
518
519 if (!dst) {
520 struct neighbour *neigh = NULL;
521
522 if (skb->dst)
523 neigh = skb->dst->neighbour;
524
525 if (neigh == NULL) {
526 if (net_ratelimit())
527 printk(KERN_DEBUG "sit: nexthop == NULL\n");
528 goto tx_error;
529 }
530
531 addr6 = (struct in6_addr*)&neigh->primary_key;
532 addr_type = ipv6_addr_type(addr6);
533
534 if (addr_type == IPV6_ADDR_ANY) {
0660e03f 535 addr6 = &ipv6_hdr(skb)->daddr;
1da177e4
LT		 536 addr_type = ipv6_addr_type(addr6);
537 }
538
539 if ((addr_type & IPV6_ADDR_COMPATv4) == 0)
540 goto tx_error_icmp;
541
542 dst = addr6->s6_addr32[3];
543 }
544
545 {
546 struct flowi fl = { .nl_u = { .ip4_u =
547 { .daddr = dst,
548 .saddr = tiph->saddr,
549 .tos = RT_TOS(tos) } },
550 .oif = tunnel->parms.link,
551 .proto = IPPROTO_IPV6 };
f206351a 552 if (ip_route_output_key(&init_net, &rt, &fl)) {
1da177e4
LT		 553 tunnel->stat.tx_carrier_errors++;
554 goto tx_error_icmp;
555 }
556 }
557 if (rt->rt_type != RTN_UNICAST) {
558 ip_rt_put(rt);
559 tunnel->stat.tx_carrier_errors++;
560 goto tx_error_icmp;
561 }
562 tdev = rt->u.dst.dev;
563
564 if (tdev == dev) {
565 ip_rt_put(rt);
566 tunnel->stat.collisions++;
567 goto tx_error;
568 }
569
570 if (tiph->frag_off)
571 mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr);
572 else
573 mtu = skb->dst ? dst_mtu(skb->dst) : dev->mtu;
574
575 if (mtu < 68) {
576 tunnel->stat.collisions++;
577 ip_rt_put(rt);
578 goto tx_error;
579 }
580 if (mtu < IPV6_MIN_MTU)
581 mtu = IPV6_MIN_MTU;
582 if (tunnel->parms.iph.daddr && skb->dst)
583 skb->dst->ops->update_pmtu(skb->dst, mtu);
584
585 if (skb->len > mtu) {
586 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev);
587 ip_rt_put(rt);
588 goto tx_error;
589 }
590
591 if (tunnel->err_count > 0) {
592 if (jiffies - tunnel->err_time < IPTUNNEL_ERR_TIMEO) {
593 tunnel->err_count--;
594 dst_link_failure(skb);
595 } else
596 tunnel->err_count = 0;
597 }
598
599 /*
600 * Okay, now see if we can stuff it in the buffer as-is.
601 */
602 max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr);
603
cfbba49d
PM		 604 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
605 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
1da177e4
LT		 606 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
607 if (!new_skb) {
608 ip_rt_put(rt);
1ab1457c 609 stats->tx_dropped++;
1da177e4
LT		 610 dev_kfree_skb(skb);
611 tunnel->recursion--;
612 return 0;
613 }
614 if (skb->sk)
615 skb_set_owner_w(new_skb, skb->sk);
616 dev_kfree_skb(skb);
617 skb = new_skb;
0660e03f 618 iph6 = ipv6_hdr(skb);
1da177e4
LT		 619 }
620
b0e380b1 621 skb->transport_header = skb->network_header;
e2d1bca7
ACM		 622 skb_push(skb, sizeof(struct iphdr));
623 skb_reset_network_header(skb);
1da177e4 624 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
8cdfab8a 625 IPCB(skb)->flags = 0;
1da177e4
LT		 626 dst_release(skb->dst);
627 skb->dst = &rt->u.dst;
628
629 /*
630 * Push down and install the IPIP header.
631 */
632
eddc9ec5 633 iph = ip_hdr(skb);
1da177e4
LT		 634 iph->version = 4;
635 iph->ihl = sizeof(struct iphdr)>>2;
636 if (mtu > IPV6_MIN_MTU)
637 iph->frag_off = htons(IP_DF);
638 else
639 iph->frag_off = 0;
640
641 iph->protocol = IPPROTO_IPV6;
642 iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
643 iph->daddr = rt->rt_dst;
644 iph->saddr = rt->rt_src;
645
646 if ((iph->ttl = tiph->ttl) == 0)
647 iph->ttl = iph6->hop_limit;
648
649 nf_reset(skb);
650
651 IPTUNNEL_XMIT();
652 tunnel->recursion--;
653 return 0;
654
655tx_error_icmp:
656 dst_link_failure(skb);
657tx_error:
658 stats->tx_errors++;
659 dev_kfree_skb(skb);
660 tunnel->recursion--;
661 return 0;
662}
663
8a4a50f9
MS		 664static void ipip6_tunnel_bind_dev(struct net_device *dev)
665{
666 struct net_device *tdev = NULL;
667 struct ip_tunnel *tunnel;
668 struct iphdr *iph;
669
670 tunnel = netdev_priv(dev);
671 iph = &tunnel->parms.iph;
672
673 if (iph->daddr) {
674 struct flowi fl = { .nl_u = { .ip4_u =
675 { .daddr = iph->daddr,
676 .saddr = iph->saddr,
677 .tos = RT_TOS(iph->tos) } },
678 .oif = tunnel->parms.link,
679 .proto = IPPROTO_IPV6 };
680 struct rtable *rt;
f206351a 681 if (!ip_route_output_key(&init_net, &rt, &fl)) {
8a4a50f9
MS		 682 tdev = rt->u.dst.dev;
683 ip_rt_put(rt);
684 }
685 dev->flags |= IFF_POINTOPOINT;
686 }
687
688 if (!tdev && tunnel->parms.link)
689 tdev = __dev_get_by_index(&init_net, tunnel->parms.link);
690
691 if (tdev) {
692 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
693 dev->mtu = tdev->mtu - sizeof(struct iphdr);
694 if (dev->mtu < IPV6_MIN_MTU)
695 dev->mtu = IPV6_MIN_MTU;
696 }
697 dev->iflink = tunnel->parms.link;
698}
699
1da177e4
LT		 700static int
701ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
702{
703 int err = 0;
704 struct ip_tunnel_parm p;
705 struct ip_tunnel *t;
706
707 switch (cmd) {
708 case SIOCGETTUNNEL:
709 t = NULL;
710 if (dev == ipip6_fb_tunnel_dev) {
711 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
712 err = -EFAULT;
713 break;
714 }
715 t = ipip6_tunnel_locate(&p, 0);
716 }
717 if (t == NULL)
2941a486 718 t = netdev_priv(dev);
1da177e4
LT		 719 memcpy(&p, &t->parms, sizeof(p));
720 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
721 err = -EFAULT;
722 break;
723
724 case SIOCADDTUNNEL:
725 case SIOCCHGTUNNEL:
726 err = -EPERM;
727 if (!capable(CAP_NET_ADMIN))
728 goto done;
729
730 err = -EFAULT;
731 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
732 goto done;
733
734 err = -EINVAL;
735 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 ||
736 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
737 goto done;
738 if (p.iph.ttl)
739 p.iph.frag_off |= htons(IP_DF);
740
741 t = ipip6_tunnel_locate(&p, cmd == SIOCADDTUNNEL);
742
743 if (dev != ipip6_fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
744 if (t != NULL) {
745 if (t->dev != dev) {
746 err = -EEXIST;
747 break;
748 }
749 } else {
750 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
751 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
752 err = -EINVAL;
753 break;
754 }
2941a486 755 t = netdev_priv(dev);
1da177e4
LT		 756 ipip6_tunnel_unlink(t);
757 t->parms.iph.saddr = p.iph.saddr;
758 t->parms.iph.daddr = p.iph.daddr;
759 memcpy(dev->dev_addr, &p.iph.saddr, 4);
760 memcpy(dev->broadcast, &p.iph.daddr, 4);
761 ipip6_tunnel_link(t);
762 netdev_state_change(dev);
763 }
764 }
765
766 if (t) {
767 err = 0;
768 if (cmd == SIOCCHGTUNNEL) {
769 t->parms.iph.ttl = p.iph.ttl;
770 t->parms.iph.tos = p.iph.tos;
8a4a50f9
MS		 771 if (t->parms.link != p.link) {
772 t->parms.link = p.link;
773 ipip6_tunnel_bind_dev(dev);
774 netdev_state_change(dev);
775 }
1da177e4
LT		 776 }
777 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
778 err = -EFAULT;
779 } else
780 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
781 break;
782
783 case SIOCDELTUNNEL:
784 err = -EPERM;
785 if (!capable(CAP_NET_ADMIN))
786 goto done;
787
788 if (dev == ipip6_fb_tunnel_dev) {
789 err = -EFAULT;
790 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
791 goto done;
792 err = -ENOENT;
793 if ((t = ipip6_tunnel_locate(&p, 0)) == NULL)
794 goto done;
795 err = -EPERM;
2941a486 796 if (t == netdev_priv(ipip6_fb_tunnel_dev))
1da177e4
LT		 797 goto done;
798 dev = t->dev;
799 }
22f8cde5
SH		 800 unregister_netdevice(dev);
801 err = 0;
1da177e4
LT		 802 break;
803
804 default:
805 err = -EINVAL;
806 }
807
808done:
809 return err;
810}
811
812static struct net_device_stats *ipip6_tunnel_get_stats(struct net_device *dev)
813{
2941a486 814 return &(((struct ip_tunnel*)netdev_priv(dev))->stat);
1da177e4
LT		 815}
816
817static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
818{
819 if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr))
820 return -EINVAL;
821 dev->mtu = new_mtu;
822 return 0;
823}
824
825static void ipip6_tunnel_setup(struct net_device *dev)
826{
1da177e4
LT		 827 dev->uninit = ipip6_tunnel_uninit;
828 dev->destructor = free_netdev;
829 dev->hard_start_xmit = ipip6_tunnel_xmit;
830 dev->get_stats = ipip6_tunnel_get_stats;
831 dev->do_ioctl = ipip6_tunnel_ioctl;
832 dev->change_mtu = ipip6_tunnel_change_mtu;
833
834 dev->type = ARPHRD_SIT;
835 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
46f25dff 836 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr);
1da177e4
LT		 837 dev->flags = IFF_NOARP;
838 dev->iflink = 0;
839 dev->addr_len = 4;
840}
841
842static int ipip6_tunnel_init(struct net_device *dev)
843{
1da177e4 844 struct ip_tunnel *tunnel;
1da177e4 845
2941a486 846 tunnel = netdev_priv(dev);
1da177e4
LT		 847
848 tunnel->dev = dev;
849 strcpy(tunnel->parms.name, dev->name);
850
851 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
852 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
853
8a4a50f9 854 ipip6_tunnel_bind_dev(dev);
1da177e4
LT		 855
856 return 0;
857}
858
20380731 859static int __init ipip6_fb_tunnel_init(struct net_device *dev)
1da177e4 860{
2941a486 861 struct ip_tunnel *tunnel = netdev_priv(dev);
1da177e4
LT		 862 struct iphdr *iph = &tunnel->parms.iph;
863
864 tunnel->dev = dev;
865 strcpy(tunnel->parms.name, dev->name);
866
867 iph->version = 4;
868 iph->protocol = IPPROTO_IPV6;
869 iph->ihl = 5;
870 iph->ttl = 64;
871
872 dev_hold(dev);
873 tunnels_wc[0] = tunnel;
874 return 0;
875}
876
c73cb5a2 877static struct xfrm_tunnel sit_handler = {
1da177e4
LT		 878 .handler = ipip6_rcv,
879 .err_handler = ipip6_err,
c73cb5a2 880 .priority = 1,
1da177e4
LT		 881};
882
db44575f
AK		 883static void __exit sit_destroy_tunnels(void)
884{
885 int prio;
886
887 for (prio = 1; prio < 4; prio++) {
888 int h;
889 for (h = 0; h < HASH_SIZE; h++) {
890 struct ip_tunnel *t;
891 while ((t = tunnels[prio][h]) != NULL)
892 unregister_netdevice(t->dev);
893 }
894 }
895}
896
89c89458 897static void __exit sit_cleanup(void)
1da177e4 898{
c73cb5a2 899 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
db44575f
AK		 900
901 rtnl_lock();
902 sit_destroy_tunnels();
903 unregister_netdevice(ipip6_fb_tunnel_dev);
904 rtnl_unlock();
1da177e4
LT		 905}
906
89c89458 907static int __init sit_init(void)
1da177e4
LT		 908{
909 int err;
910
911 printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n");
912
c73cb5a2 913 if (xfrm4_tunnel_register(&sit_handler, AF_INET6) < 0) {
1da177e4
LT		 914 printk(KERN_INFO "sit init: Can't add protocol\n");
915 return -EAGAIN;
916 }
917
1ab1457c 918 ipip6_fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
1da177e4
LT		 919 ipip6_tunnel_setup);
920 if (!ipip6_fb_tunnel_dev) {
921 err = -ENOMEM;
922 goto err1;
923 }
924
925 ipip6_fb_tunnel_dev->init = ipip6_fb_tunnel_init;
926
927 if ((err = register_netdev(ipip6_fb_tunnel_dev)))
928 goto err2;
929
930 out:
931 return err;
932 err2:
933 free_netdev(ipip6_fb_tunnel_dev);
934 err1:
c73cb5a2 935 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1da177e4
LT		 936 goto out;
937}
989e5b96
JR		 938
939module_init(sit_init);
940module_exit(sit_cleanup);
39c85086 941MODULE_LICENSE("GPL");
daccff02 942MODULE_ALIAS("sit0");
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