Commit | Line | Data |
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1da177e4 LT |
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 | * $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 | |
19 | */ | |
20 | ||
21 | #include <linux/config.h> | |
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> | |
28 | #include <linux/sched.h> | |
29 | #include <linux/net.h> | |
30 | #include <linux/in6.h> | |
31 | #include <linux/netdevice.h> | |
32 | #include <linux/if_arp.h> | |
33 | #include <linux/icmp.h> | |
34 | #include <asm/uaccess.h> | |
35 | #include <linux/init.h> | |
36 | #include <linux/netfilter_ipv4.h> | |
46f25dff | 37 | #include <linux/if_ether.h> |
1da177e4 LT |
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 | ||
57 | /* | |
58 | This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c | |
59 | ||
60 | For comments look at net/ipv4/ip_gre.c --ANK | |
61 | */ | |
62 | ||
63 | #define HASH_SIZE 16 | |
64 | #define HASH(addr) ((addr^(addr>>4))&0xF) | |
65 | ||
66 | static int ipip6_fb_tunnel_init(struct net_device *dev); | |
67 | static int ipip6_tunnel_init(struct net_device *dev); | |
68 | static void ipip6_tunnel_setup(struct net_device *dev); | |
69 | ||
70 | static struct net_device *ipip6_fb_tunnel_dev; | |
71 | ||
72 | static struct ip_tunnel *tunnels_r_l[HASH_SIZE]; | |
73 | static struct ip_tunnel *tunnels_r[HASH_SIZE]; | |
74 | static struct ip_tunnel *tunnels_l[HASH_SIZE]; | |
75 | static struct ip_tunnel *tunnels_wc[1]; | |
76 | static struct ip_tunnel **tunnels[4] = { tunnels_wc, tunnels_l, tunnels_r, tunnels_r_l }; | |
77 | ||
78 | static DEFINE_RWLOCK(ipip6_lock); | |
79 | ||
80 | static struct ip_tunnel * ipip6_tunnel_lookup(u32 remote, u32 local) | |
81 | { | |
82 | unsigned h0 = HASH(remote); | |
83 | unsigned h1 = HASH(local); | |
84 | struct ip_tunnel *t; | |
85 | ||
86 | for (t = tunnels_r_l[h0^h1]; t; t = t->next) { | |
87 | if (local == t->parms.iph.saddr && | |
88 | remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) | |
89 | return t; | |
90 | } | |
91 | for (t = tunnels_r[h0]; t; t = t->next) { | |
92 | if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) | |
93 | return t; | |
94 | } | |
95 | for (t = tunnels_l[h1]; t; t = t->next) { | |
96 | if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP)) | |
97 | return t; | |
98 | } | |
99 | if ((t = tunnels_wc[0]) != NULL && (t->dev->flags&IFF_UP)) | |
100 | return t; | |
101 | return NULL; | |
102 | } | |
103 | ||
104 | static struct ip_tunnel ** ipip6_bucket(struct ip_tunnel *t) | |
105 | { | |
106 | u32 remote = t->parms.iph.daddr; | |
107 | u32 local = t->parms.iph.saddr; | |
108 | unsigned h = 0; | |
109 | int prio = 0; | |
110 | ||
111 | if (remote) { | |
112 | prio |= 2; | |
113 | h ^= HASH(remote); | |
114 | } | |
115 | if (local) { | |
116 | prio |= 1; | |
117 | h ^= HASH(local); | |
118 | } | |
119 | return &tunnels[prio][h]; | |
120 | } | |
121 | ||
122 | static void ipip6_tunnel_unlink(struct ip_tunnel *t) | |
123 | { | |
124 | struct ip_tunnel **tp; | |
125 | ||
126 | for (tp = ipip6_bucket(t); *tp; tp = &(*tp)->next) { | |
127 | if (t == *tp) { | |
128 | write_lock_bh(&ipip6_lock); | |
129 | *tp = t->next; | |
130 | write_unlock_bh(&ipip6_lock); | |
131 | break; | |
132 | } | |
133 | } | |
134 | } | |
135 | ||
136 | static void ipip6_tunnel_link(struct ip_tunnel *t) | |
137 | { | |
138 | struct ip_tunnel **tp = ipip6_bucket(t); | |
139 | ||
140 | t->next = *tp; | |
141 | write_lock_bh(&ipip6_lock); | |
142 | *tp = t; | |
143 | write_unlock_bh(&ipip6_lock); | |
144 | } | |
145 | ||
146 | static struct ip_tunnel * ipip6_tunnel_locate(struct ip_tunnel_parm *parms, int create) | |
147 | { | |
148 | u32 remote = parms->iph.daddr; | |
149 | u32 local = parms->iph.saddr; | |
150 | struct ip_tunnel *t, **tp, *nt; | |
151 | struct net_device *dev; | |
152 | unsigned h = 0; | |
153 | int prio = 0; | |
154 | char name[IFNAMSIZ]; | |
155 | ||
156 | if (remote) { | |
157 | prio |= 2; | |
158 | h ^= HASH(remote); | |
159 | } | |
160 | if (local) { | |
161 | prio |= 1; | |
162 | h ^= HASH(local); | |
163 | } | |
164 | for (tp = &tunnels[prio][h]; (t = *tp) != NULL; tp = &t->next) { | |
165 | if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr) | |
166 | return t; | |
167 | } | |
168 | if (!create) | |
169 | goto failed; | |
170 | ||
171 | if (parms->name[0]) | |
172 | strlcpy(name, parms->name, IFNAMSIZ); | |
173 | else { | |
174 | int i; | |
175 | for (i=1; i<100; i++) { | |
176 | sprintf(name, "sit%d", i); | |
177 | if (__dev_get_by_name(name) == NULL) | |
178 | break; | |
179 | } | |
180 | if (i==100) | |
181 | goto failed; | |
182 | } | |
183 | ||
184 | dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup); | |
185 | if (dev == NULL) | |
186 | return NULL; | |
187 | ||
2941a486 | 188 | nt = netdev_priv(dev); |
1da177e4 LT |
189 | dev->init = ipip6_tunnel_init; |
190 | nt->parms = *parms; | |
191 | ||
192 | if (register_netdevice(dev) < 0) { | |
193 | free_netdev(dev); | |
194 | goto failed; | |
195 | } | |
196 | ||
197 | dev_hold(dev); | |
198 | ||
199 | ipip6_tunnel_link(nt); | |
1da177e4 LT |
200 | return nt; |
201 | ||
202 | failed: | |
203 | return NULL; | |
204 | } | |
205 | ||
206 | static void ipip6_tunnel_uninit(struct net_device *dev) | |
207 | { | |
208 | if (dev == ipip6_fb_tunnel_dev) { | |
209 | write_lock_bh(&ipip6_lock); | |
210 | tunnels_wc[0] = NULL; | |
211 | write_unlock_bh(&ipip6_lock); | |
212 | dev_put(dev); | |
213 | } else { | |
2941a486 | 214 | ipip6_tunnel_unlink(netdev_priv(dev)); |
1da177e4 LT |
215 | dev_put(dev); |
216 | } | |
217 | } | |
218 | ||
219 | ||
220 | static void ipip6_err(struct sk_buff *skb, u32 info) | |
221 | { | |
222 | #ifndef I_WISH_WORLD_WERE_PERFECT | |
223 | ||
224 | /* It is not :-( All the routers (except for Linux) return only | |
225 | 8 bytes of packet payload. It means, that precise relaying of | |
226 | ICMP in the real Internet is absolutely infeasible. | |
227 | */ | |
228 | struct iphdr *iph = (struct iphdr*)skb->data; | |
229 | int type = skb->h.icmph->type; | |
230 | int code = skb->h.icmph->code; | |
231 | struct ip_tunnel *t; | |
232 | ||
233 | switch (type) { | |
234 | default: | |
235 | case ICMP_PARAMETERPROB: | |
236 | return; | |
237 | ||
238 | case ICMP_DEST_UNREACH: | |
239 | switch (code) { | |
240 | case ICMP_SR_FAILED: | |
241 | case ICMP_PORT_UNREACH: | |
242 | /* Impossible event. */ | |
243 | return; | |
244 | case ICMP_FRAG_NEEDED: | |
245 | /* Soft state for pmtu is maintained by IP core. */ | |
246 | return; | |
247 | default: | |
248 | /* All others are translated to HOST_UNREACH. | |
249 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
250 | I believe they are just ether pollution. --ANK | |
251 | */ | |
252 | break; | |
253 | } | |
254 | break; | |
255 | case ICMP_TIME_EXCEEDED: | |
256 | if (code != ICMP_EXC_TTL) | |
257 | return; | |
258 | break; | |
259 | } | |
260 | ||
261 | read_lock(&ipip6_lock); | |
262 | t = ipip6_tunnel_lookup(iph->daddr, iph->saddr); | |
263 | if (t == NULL || t->parms.iph.daddr == 0) | |
264 | goto out; | |
265 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) | |
266 | goto out; | |
267 | ||
268 | if (jiffies - t->err_time < IPTUNNEL_ERR_TIMEO) | |
269 | t->err_count++; | |
270 | else | |
271 | t->err_count = 1; | |
272 | t->err_time = jiffies; | |
273 | out: | |
274 | read_unlock(&ipip6_lock); | |
275 | return; | |
276 | #else | |
277 | struct iphdr *iph = (struct iphdr*)dp; | |
278 | int hlen = iph->ihl<<2; | |
279 | struct ipv6hdr *iph6; | |
280 | int type = skb->h.icmph->type; | |
281 | int code = skb->h.icmph->code; | |
282 | int rel_type = 0; | |
283 | int rel_code = 0; | |
284 | int rel_info = 0; | |
285 | struct sk_buff *skb2; | |
286 | struct rt6_info *rt6i; | |
287 | ||
288 | if (len < hlen + sizeof(struct ipv6hdr)) | |
289 | return; | |
290 | iph6 = (struct ipv6hdr*)(dp + hlen); | |
291 | ||
292 | switch (type) { | |
293 | default: | |
294 | return; | |
295 | case ICMP_PARAMETERPROB: | |
296 | if (skb->h.icmph->un.gateway < hlen) | |
297 | return; | |
298 | ||
299 | /* So... This guy found something strange INSIDE encapsulated | |
300 | packet. Well, he is fool, but what can we do ? | |
301 | */ | |
302 | rel_type = ICMPV6_PARAMPROB; | |
303 | rel_info = skb->h.icmph->un.gateway - hlen; | |
304 | break; | |
305 | ||
306 | case ICMP_DEST_UNREACH: | |
307 | switch (code) { | |
308 | case ICMP_SR_FAILED: | |
309 | case ICMP_PORT_UNREACH: | |
310 | /* Impossible event. */ | |
311 | return; | |
312 | case ICMP_FRAG_NEEDED: | |
313 | /* Too complicated case ... */ | |
314 | return; | |
315 | default: | |
316 | /* All others are translated to HOST_UNREACH. | |
317 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
318 | I believe, it is just ether pollution. --ANK | |
319 | */ | |
320 | rel_type = ICMPV6_DEST_UNREACH; | |
321 | rel_code = ICMPV6_ADDR_UNREACH; | |
322 | break; | |
323 | } | |
324 | break; | |
325 | case ICMP_TIME_EXCEEDED: | |
326 | if (code != ICMP_EXC_TTL) | |
327 | return; | |
328 | rel_type = ICMPV6_TIME_EXCEED; | |
329 | rel_code = ICMPV6_EXC_HOPLIMIT; | |
330 | break; | |
331 | } | |
332 | ||
333 | /* Prepare fake skb to feed it to icmpv6_send */ | |
334 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
335 | if (skb2 == NULL) | |
336 | return; | |
337 | dst_release(skb2->dst); | |
338 | skb2->dst = NULL; | |
339 | skb_pull(skb2, skb->data - (u8*)iph6); | |
340 | skb2->nh.raw = skb2->data; | |
341 | ||
342 | /* Try to guess incoming interface */ | |
343 | rt6i = rt6_lookup(&iph6->saddr, NULL, NULL, 0); | |
344 | if (rt6i && rt6i->rt6i_dev) { | |
345 | skb2->dev = rt6i->rt6i_dev; | |
346 | ||
347 | rt6i = rt6_lookup(&iph6->daddr, &iph6->saddr, NULL, 0); | |
348 | ||
349 | if (rt6i && rt6i->rt6i_dev && rt6i->rt6i_dev->type == ARPHRD_SIT) { | |
2941a486 | 350 | struct ip_tunnel *t = netdev_priv(rt6i->rt6i_dev); |
1da177e4 LT |
351 | if (rel_type == ICMPV6_TIME_EXCEED && t->parms.iph.ttl) { |
352 | rel_type = ICMPV6_DEST_UNREACH; | |
353 | rel_code = ICMPV6_ADDR_UNREACH; | |
354 | } | |
355 | icmpv6_send(skb2, rel_type, rel_code, rel_info, skb2->dev); | |
356 | } | |
357 | } | |
358 | kfree_skb(skb2); | |
359 | return; | |
360 | #endif | |
361 | } | |
362 | ||
363 | static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb) | |
364 | { | |
365 | if (INET_ECN_is_ce(iph->tos)) | |
366 | IP6_ECN_set_ce(skb->nh.ipv6h); | |
367 | } | |
368 | ||
369 | static int ipip6_rcv(struct sk_buff *skb) | |
370 | { | |
371 | struct iphdr *iph; | |
372 | struct ip_tunnel *tunnel; | |
373 | ||
374 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
375 | goto out; | |
376 | ||
377 | iph = skb->nh.iph; | |
378 | ||
379 | read_lock(&ipip6_lock); | |
380 | if ((tunnel = ipip6_tunnel_lookup(iph->saddr, iph->daddr)) != NULL) { | |
381 | secpath_reset(skb); | |
382 | skb->mac.raw = skb->nh.raw; | |
383 | skb->nh.raw = skb->data; | |
384 | memset(&(IPCB(skb)->opt), 0, sizeof(struct ip_options)); | |
8cdfab8a | 385 | IPCB(skb)->flags = 0; |
1da177e4 LT |
386 | skb->protocol = htons(ETH_P_IPV6); |
387 | skb->pkt_type = PACKET_HOST; | |
388 | tunnel->stat.rx_packets++; | |
389 | tunnel->stat.rx_bytes += skb->len; | |
390 | skb->dev = tunnel->dev; | |
391 | dst_release(skb->dst); | |
392 | skb->dst = NULL; | |
393 | nf_reset(skb); | |
394 | ipip6_ecn_decapsulate(iph, skb); | |
395 | netif_rx(skb); | |
396 | read_unlock(&ipip6_lock); | |
397 | return 0; | |
398 | } | |
399 | ||
400 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PROT_UNREACH, 0); | |
401 | kfree_skb(skb); | |
402 | read_unlock(&ipip6_lock); | |
403 | out: | |
404 | return 0; | |
405 | } | |
406 | ||
407 | /* Returns the embedded IPv4 address if the IPv6 address | |
408 | comes from 6to4 (RFC 3056) addr space */ | |
409 | ||
410 | static inline u32 try_6to4(struct in6_addr *v6dst) | |
411 | { | |
412 | u32 dst = 0; | |
413 | ||
414 | if (v6dst->s6_addr16[0] == htons(0x2002)) { | |
415 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ | |
416 | memcpy(&dst, &v6dst->s6_addr16[1], 4); | |
417 | } | |
418 | return dst; | |
419 | } | |
420 | ||
421 | /* | |
422 | * This function assumes it is being called from dev_queue_xmit() | |
423 | * and that skb is filled properly by that function. | |
424 | */ | |
425 | ||
426 | static int ipip6_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) | |
427 | { | |
2941a486 | 428 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
429 | struct net_device_stats *stats = &tunnel->stat; |
430 | struct iphdr *tiph = &tunnel->parms.iph; | |
431 | struct ipv6hdr *iph6 = skb->nh.ipv6h; | |
432 | u8 tos = tunnel->parms.iph.tos; | |
433 | struct rtable *rt; /* Route to the other host */ | |
434 | struct net_device *tdev; /* Device to other host */ | |
435 | struct iphdr *iph; /* Our new IP header */ | |
436 | int max_headroom; /* The extra header space needed */ | |
437 | u32 dst = tiph->daddr; | |
438 | int mtu; | |
439 | struct in6_addr *addr6; | |
440 | int addr_type; | |
441 | ||
442 | if (tunnel->recursion++) { | |
443 | tunnel->stat.collisions++; | |
444 | goto tx_error; | |
445 | } | |
446 | ||
447 | if (skb->protocol != htons(ETH_P_IPV6)) | |
448 | goto tx_error; | |
449 | ||
450 | if (!dst) | |
451 | dst = try_6to4(&iph6->daddr); | |
452 | ||
453 | if (!dst) { | |
454 | struct neighbour *neigh = NULL; | |
455 | ||
456 | if (skb->dst) | |
457 | neigh = skb->dst->neighbour; | |
458 | ||
459 | if (neigh == NULL) { | |
460 | if (net_ratelimit()) | |
461 | printk(KERN_DEBUG "sit: nexthop == NULL\n"); | |
462 | goto tx_error; | |
463 | } | |
464 | ||
465 | addr6 = (struct in6_addr*)&neigh->primary_key; | |
466 | addr_type = ipv6_addr_type(addr6); | |
467 | ||
468 | if (addr_type == IPV6_ADDR_ANY) { | |
469 | addr6 = &skb->nh.ipv6h->daddr; | |
470 | addr_type = ipv6_addr_type(addr6); | |
471 | } | |
472 | ||
473 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
474 | goto tx_error_icmp; | |
475 | ||
476 | dst = addr6->s6_addr32[3]; | |
477 | } | |
478 | ||
479 | { | |
480 | struct flowi fl = { .nl_u = { .ip4_u = | |
481 | { .daddr = dst, | |
482 | .saddr = tiph->saddr, | |
483 | .tos = RT_TOS(tos) } }, | |
484 | .oif = tunnel->parms.link, | |
485 | .proto = IPPROTO_IPV6 }; | |
486 | if (ip_route_output_key(&rt, &fl)) { | |
487 | tunnel->stat.tx_carrier_errors++; | |
488 | goto tx_error_icmp; | |
489 | } | |
490 | } | |
491 | if (rt->rt_type != RTN_UNICAST) { | |
492 | ip_rt_put(rt); | |
493 | tunnel->stat.tx_carrier_errors++; | |
494 | goto tx_error_icmp; | |
495 | } | |
496 | tdev = rt->u.dst.dev; | |
497 | ||
498 | if (tdev == dev) { | |
499 | ip_rt_put(rt); | |
500 | tunnel->stat.collisions++; | |
501 | goto tx_error; | |
502 | } | |
503 | ||
504 | if (tiph->frag_off) | |
505 | mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr); | |
506 | else | |
507 | mtu = skb->dst ? dst_mtu(skb->dst) : dev->mtu; | |
508 | ||
509 | if (mtu < 68) { | |
510 | tunnel->stat.collisions++; | |
511 | ip_rt_put(rt); | |
512 | goto tx_error; | |
513 | } | |
514 | if (mtu < IPV6_MIN_MTU) | |
515 | mtu = IPV6_MIN_MTU; | |
516 | if (tunnel->parms.iph.daddr && skb->dst) | |
517 | skb->dst->ops->update_pmtu(skb->dst, mtu); | |
518 | ||
519 | if (skb->len > mtu) { | |
520 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev); | |
521 | ip_rt_put(rt); | |
522 | goto tx_error; | |
523 | } | |
524 | ||
525 | if (tunnel->err_count > 0) { | |
526 | if (jiffies - tunnel->err_time < IPTUNNEL_ERR_TIMEO) { | |
527 | tunnel->err_count--; | |
528 | dst_link_failure(skb); | |
529 | } else | |
530 | tunnel->err_count = 0; | |
531 | } | |
532 | ||
533 | /* | |
534 | * Okay, now see if we can stuff it in the buffer as-is. | |
535 | */ | |
536 | max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr); | |
537 | ||
538 | if (skb_headroom(skb) < max_headroom || skb_cloned(skb) || skb_shared(skb)) { | |
539 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); | |
540 | if (!new_skb) { | |
541 | ip_rt_put(rt); | |
542 | stats->tx_dropped++; | |
543 | dev_kfree_skb(skb); | |
544 | tunnel->recursion--; | |
545 | return 0; | |
546 | } | |
547 | if (skb->sk) | |
548 | skb_set_owner_w(new_skb, skb->sk); | |
549 | dev_kfree_skb(skb); | |
550 | skb = new_skb; | |
551 | iph6 = skb->nh.ipv6h; | |
552 | } | |
553 | ||
554 | skb->h.raw = skb->nh.raw; | |
555 | skb->nh.raw = skb_push(skb, sizeof(struct iphdr)); | |
556 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); | |
8cdfab8a | 557 | IPCB(skb)->flags = 0; |
1da177e4 LT |
558 | dst_release(skb->dst); |
559 | skb->dst = &rt->u.dst; | |
560 | ||
561 | /* | |
562 | * Push down and install the IPIP header. | |
563 | */ | |
564 | ||
565 | iph = skb->nh.iph; | |
566 | iph->version = 4; | |
567 | iph->ihl = sizeof(struct iphdr)>>2; | |
568 | if (mtu > IPV6_MIN_MTU) | |
569 | iph->frag_off = htons(IP_DF); | |
570 | else | |
571 | iph->frag_off = 0; | |
572 | ||
573 | iph->protocol = IPPROTO_IPV6; | |
574 | iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); | |
575 | iph->daddr = rt->rt_dst; | |
576 | iph->saddr = rt->rt_src; | |
577 | ||
578 | if ((iph->ttl = tiph->ttl) == 0) | |
579 | iph->ttl = iph6->hop_limit; | |
580 | ||
581 | nf_reset(skb); | |
582 | ||
583 | IPTUNNEL_XMIT(); | |
584 | tunnel->recursion--; | |
585 | return 0; | |
586 | ||
587 | tx_error_icmp: | |
588 | dst_link_failure(skb); | |
589 | tx_error: | |
590 | stats->tx_errors++; | |
591 | dev_kfree_skb(skb); | |
592 | tunnel->recursion--; | |
593 | return 0; | |
594 | } | |
595 | ||
596 | static int | |
597 | ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
598 | { | |
599 | int err = 0; | |
600 | struct ip_tunnel_parm p; | |
601 | struct ip_tunnel *t; | |
602 | ||
603 | switch (cmd) { | |
604 | case SIOCGETTUNNEL: | |
605 | t = NULL; | |
606 | if (dev == ipip6_fb_tunnel_dev) { | |
607 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { | |
608 | err = -EFAULT; | |
609 | break; | |
610 | } | |
611 | t = ipip6_tunnel_locate(&p, 0); | |
612 | } | |
613 | if (t == NULL) | |
2941a486 | 614 | t = netdev_priv(dev); |
1da177e4 LT |
615 | memcpy(&p, &t->parms, sizeof(p)); |
616 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
617 | err = -EFAULT; | |
618 | break; | |
619 | ||
620 | case SIOCADDTUNNEL: | |
621 | case SIOCCHGTUNNEL: | |
622 | err = -EPERM; | |
623 | if (!capable(CAP_NET_ADMIN)) | |
624 | goto done; | |
625 | ||
626 | err = -EFAULT; | |
627 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
628 | goto done; | |
629 | ||
630 | err = -EINVAL; | |
631 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 || | |
632 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) | |
633 | goto done; | |
634 | if (p.iph.ttl) | |
635 | p.iph.frag_off |= htons(IP_DF); | |
636 | ||
637 | t = ipip6_tunnel_locate(&p, cmd == SIOCADDTUNNEL); | |
638 | ||
639 | if (dev != ipip6_fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { | |
640 | if (t != NULL) { | |
641 | if (t->dev != dev) { | |
642 | err = -EEXIST; | |
643 | break; | |
644 | } | |
645 | } else { | |
646 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
647 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
648 | err = -EINVAL; | |
649 | break; | |
650 | } | |
2941a486 | 651 | t = netdev_priv(dev); |
1da177e4 LT |
652 | ipip6_tunnel_unlink(t); |
653 | t->parms.iph.saddr = p.iph.saddr; | |
654 | t->parms.iph.daddr = p.iph.daddr; | |
655 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
656 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
657 | ipip6_tunnel_link(t); | |
658 | netdev_state_change(dev); | |
659 | } | |
660 | } | |
661 | ||
662 | if (t) { | |
663 | err = 0; | |
664 | if (cmd == SIOCCHGTUNNEL) { | |
665 | t->parms.iph.ttl = p.iph.ttl; | |
666 | t->parms.iph.tos = p.iph.tos; | |
667 | } | |
668 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
669 | err = -EFAULT; | |
670 | } else | |
671 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
672 | break; | |
673 | ||
674 | case SIOCDELTUNNEL: | |
675 | err = -EPERM; | |
676 | if (!capable(CAP_NET_ADMIN)) | |
677 | goto done; | |
678 | ||
679 | if (dev == ipip6_fb_tunnel_dev) { | |
680 | err = -EFAULT; | |
681 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
682 | goto done; | |
683 | err = -ENOENT; | |
684 | if ((t = ipip6_tunnel_locate(&p, 0)) == NULL) | |
685 | goto done; | |
686 | err = -EPERM; | |
2941a486 | 687 | if (t == netdev_priv(ipip6_fb_tunnel_dev)) |
1da177e4 LT |
688 | goto done; |
689 | dev = t->dev; | |
690 | } | |
691 | err = unregister_netdevice(dev); | |
692 | break; | |
693 | ||
694 | default: | |
695 | err = -EINVAL; | |
696 | } | |
697 | ||
698 | done: | |
699 | return err; | |
700 | } | |
701 | ||
702 | static struct net_device_stats *ipip6_tunnel_get_stats(struct net_device *dev) | |
703 | { | |
2941a486 | 704 | return &(((struct ip_tunnel*)netdev_priv(dev))->stat); |
1da177e4 LT |
705 | } |
706 | ||
707 | static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu) | |
708 | { | |
709 | if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr)) | |
710 | return -EINVAL; | |
711 | dev->mtu = new_mtu; | |
712 | return 0; | |
713 | } | |
714 | ||
715 | static void ipip6_tunnel_setup(struct net_device *dev) | |
716 | { | |
717 | SET_MODULE_OWNER(dev); | |
718 | dev->uninit = ipip6_tunnel_uninit; | |
719 | dev->destructor = free_netdev; | |
720 | dev->hard_start_xmit = ipip6_tunnel_xmit; | |
721 | dev->get_stats = ipip6_tunnel_get_stats; | |
722 | dev->do_ioctl = ipip6_tunnel_ioctl; | |
723 | dev->change_mtu = ipip6_tunnel_change_mtu; | |
724 | ||
725 | dev->type = ARPHRD_SIT; | |
726 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); | |
46f25dff | 727 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); |
1da177e4 LT |
728 | dev->flags = IFF_NOARP; |
729 | dev->iflink = 0; | |
730 | dev->addr_len = 4; | |
731 | } | |
732 | ||
733 | static int ipip6_tunnel_init(struct net_device *dev) | |
734 | { | |
735 | struct net_device *tdev = NULL; | |
736 | struct ip_tunnel *tunnel; | |
737 | struct iphdr *iph; | |
738 | ||
2941a486 | 739 | tunnel = netdev_priv(dev); |
1da177e4 LT |
740 | iph = &tunnel->parms.iph; |
741 | ||
742 | tunnel->dev = dev; | |
743 | strcpy(tunnel->parms.name, dev->name); | |
744 | ||
745 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
746 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
747 | ||
748 | if (iph->daddr) { | |
749 | struct flowi fl = { .nl_u = { .ip4_u = | |
750 | { .daddr = iph->daddr, | |
751 | .saddr = iph->saddr, | |
752 | .tos = RT_TOS(iph->tos) } }, | |
753 | .oif = tunnel->parms.link, | |
754 | .proto = IPPROTO_IPV6 }; | |
755 | struct rtable *rt; | |
756 | if (!ip_route_output_key(&rt, &fl)) { | |
757 | tdev = rt->u.dst.dev; | |
758 | ip_rt_put(rt); | |
759 | } | |
760 | dev->flags |= IFF_POINTOPOINT; | |
761 | } | |
762 | ||
763 | if (!tdev && tunnel->parms.link) | |
764 | tdev = __dev_get_by_index(tunnel->parms.link); | |
765 | ||
766 | if (tdev) { | |
767 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
768 | dev->mtu = tdev->mtu - sizeof(struct iphdr); | |
769 | if (dev->mtu < IPV6_MIN_MTU) | |
770 | dev->mtu = IPV6_MIN_MTU; | |
771 | } | |
772 | dev->iflink = tunnel->parms.link; | |
773 | ||
774 | return 0; | |
775 | } | |
776 | ||
20380731 | 777 | static int __init ipip6_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 778 | { |
2941a486 | 779 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
780 | struct iphdr *iph = &tunnel->parms.iph; |
781 | ||
782 | tunnel->dev = dev; | |
783 | strcpy(tunnel->parms.name, dev->name); | |
784 | ||
785 | iph->version = 4; | |
786 | iph->protocol = IPPROTO_IPV6; | |
787 | iph->ihl = 5; | |
788 | iph->ttl = 64; | |
789 | ||
790 | dev_hold(dev); | |
791 | tunnels_wc[0] = tunnel; | |
792 | return 0; | |
793 | } | |
794 | ||
795 | static struct net_protocol sit_protocol = { | |
796 | .handler = ipip6_rcv, | |
797 | .err_handler = ipip6_err, | |
798 | }; | |
799 | ||
db44575f AK |
800 | static void __exit sit_destroy_tunnels(void) |
801 | { | |
802 | int prio; | |
803 | ||
804 | for (prio = 1; prio < 4; prio++) { | |
805 | int h; | |
806 | for (h = 0; h < HASH_SIZE; h++) { | |
807 | struct ip_tunnel *t; | |
808 | while ((t = tunnels[prio][h]) != NULL) | |
809 | unregister_netdevice(t->dev); | |
810 | } | |
811 | } | |
812 | } | |
813 | ||
1da177e4 LT |
814 | void __exit sit_cleanup(void) |
815 | { | |
816 | inet_del_protocol(&sit_protocol, IPPROTO_IPV6); | |
db44575f AK |
817 | |
818 | rtnl_lock(); | |
819 | sit_destroy_tunnels(); | |
820 | unregister_netdevice(ipip6_fb_tunnel_dev); | |
821 | rtnl_unlock(); | |
1da177e4 LT |
822 | } |
823 | ||
824 | int __init sit_init(void) | |
825 | { | |
826 | int err; | |
827 | ||
828 | printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n"); | |
829 | ||
830 | if (inet_add_protocol(&sit_protocol, IPPROTO_IPV6) < 0) { | |
831 | printk(KERN_INFO "sit init: Can't add protocol\n"); | |
832 | return -EAGAIN; | |
833 | } | |
834 | ||
835 | ipip6_fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", | |
836 | ipip6_tunnel_setup); | |
837 | if (!ipip6_fb_tunnel_dev) { | |
838 | err = -ENOMEM; | |
839 | goto err1; | |
840 | } | |
841 | ||
842 | ipip6_fb_tunnel_dev->init = ipip6_fb_tunnel_init; | |
843 | ||
844 | if ((err = register_netdev(ipip6_fb_tunnel_dev))) | |
845 | goto err2; | |
846 | ||
847 | out: | |
848 | return err; | |
849 | err2: | |
850 | free_netdev(ipip6_fb_tunnel_dev); | |
851 | err1: | |
852 | inet_del_protocol(&sit_protocol, IPPROTO_IPV6); | |
853 | goto out; | |
854 | } |