aboutsummaryrefslogtreecommitdiffstats
path: root/net/ipv4/ipip.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/ipv4/ipip.c')
-rw-r--r--net/ipv4/ipip.c130
1 files changed, 1 insertions, 129 deletions
diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c
index 149111f08e8d..af5cb53da5cc 100644
--- a/net/ipv4/ipip.c
+++ b/net/ipv4/ipip.c
@@ -278,9 +278,8 @@ static void ipip_tunnel_uninit(struct net_device *dev)
278 278
279static int ipip_err(struct sk_buff *skb, u32 info) 279static int ipip_err(struct sk_buff *skb, u32 info)
280{ 280{
281#ifndef I_WISH_WORLD_WERE_PERFECT
282 281
283/* It is not :-( All the routers (except for Linux) return only 282/* All the routers (except for Linux) return only
284 8 bytes of packet payload. It means, that precise relaying of 283 8 bytes of packet payload. It means, that precise relaying of
285 ICMP in the real Internet is absolutely infeasible. 284 ICMP in the real Internet is absolutely infeasible.
286 */ 285 */
@@ -337,133 +336,6 @@ static int ipip_err(struct sk_buff *skb, u32 info)
337out: 336out:
338 read_unlock(&ipip_lock); 337 read_unlock(&ipip_lock);
339 return err; 338 return err;
340#else
341 struct iphdr *iph = (struct iphdr*)dp;
342 int hlen = iph->ihl<<2;
343 struct iphdr *eiph;
344 const int type = icmp_hdr(skb)->type;
345 const int code = icmp_hdr(skb)->code;
346 int rel_type = 0;
347 int rel_code = 0;
348 __be32 rel_info = 0;
349 __u32 n = 0;
350 struct sk_buff *skb2;
351 struct flowi fl;
352 struct rtable *rt;
353
354 if (len < hlen + sizeof(struct iphdr))
355 return 0;
356 eiph = (struct iphdr*)(dp + hlen);
357
358 switch (type) {
359 default:
360 return 0;
361 case ICMP_PARAMETERPROB:
362 n = ntohl(icmp_hdr(skb)->un.gateway) >> 24;
363 if (n < hlen)
364 return 0;
365
366 /* So... This guy found something strange INSIDE encapsulated
367 packet. Well, he is fool, but what can we do ?
368 */
369 rel_type = ICMP_PARAMETERPROB;
370 rel_info = htonl((n - hlen) << 24);
371 break;
372
373 case ICMP_DEST_UNREACH:
374 switch (code) {
375 case ICMP_SR_FAILED:
376 case ICMP_PORT_UNREACH:
377 /* Impossible event. */
378 return 0;
379 case ICMP_FRAG_NEEDED:
380 /* And it is the only really necessary thing :-) */
381 n = ntohs(icmp_hdr(skb)->un.frag.mtu);
382 if (n < hlen+68)
383 return 0;
384 n -= hlen;
385 /* BSD 4.2 MORE DOES NOT EXIST IN NATURE. */
386 if (n > ntohs(eiph->tot_len))
387 return 0;
388 rel_info = htonl(n);
389 break;
390 default:
391 /* All others are translated to HOST_UNREACH.
392 rfc2003 contains "deep thoughts" about NET_UNREACH,
393 I believe, it is just ether pollution. --ANK
394 */
395 rel_type = ICMP_DEST_UNREACH;
396 rel_code = ICMP_HOST_UNREACH;
397 break;
398 }
399 break;
400 case ICMP_TIME_EXCEEDED:
401 if (code != ICMP_EXC_TTL)
402 return 0;
403 break;
404 }
405
406 /* Prepare fake skb to feed it to icmp_send */
407 skb2 = skb_clone(skb, GFP_ATOMIC);
408 if (skb2 == NULL)
409 return 0;
410 dst_release(skb2->dst);
411 skb2->dst = NULL;
412 skb_pull(skb2, skb->data - (u8*)eiph);
413 skb_reset_network_header(skb2);
414
415 /* Try to guess incoming interface */
416 memset(&fl, 0, sizeof(fl));
417 fl.fl4_daddr = eiph->saddr;
418 fl.fl4_tos = RT_TOS(eiph->tos);
419 fl.proto = IPPROTO_IPIP;
420 if (ip_route_output_key(dev_net(skb->dev), &rt, &key)) {
421 kfree_skb(skb2);
422 return 0;
423 }
424 skb2->dev = rt->u.dst.dev;
425
426 /* route "incoming" packet */
427 if (rt->rt_flags&RTCF_LOCAL) {
428 ip_rt_put(rt);
429 rt = NULL;
430 fl.fl4_daddr = eiph->daddr;
431 fl.fl4_src = eiph->saddr;
432 fl.fl4_tos = eiph->tos;
433 if (ip_route_output_key(dev_net(skb->dev), &rt, &fl) ||
434 rt->u.dst.dev->type != ARPHRD_TUNNEL) {
435 ip_rt_put(rt);
436 kfree_skb(skb2);
437 return 0;
438 }
439 } else {
440 ip_rt_put(rt);
441 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, skb2->dev) ||
442 skb2->dst->dev->type != ARPHRD_TUNNEL) {
443 kfree_skb(skb2);
444 return 0;
445 }
446 }
447
448 /* change mtu on this route */
449 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
450 if (n > dst_mtu(skb2->dst)) {
451 kfree_skb(skb2);
452 return 0;
453 }
454 skb2->dst->ops->update_pmtu(skb2->dst, n);
455 } else if (type == ICMP_TIME_EXCEEDED) {
456 struct ip_tunnel *t = netdev_priv(skb2->dev);
457 if (t->parms.iph.ttl) {
458 rel_type = ICMP_DEST_UNREACH;
459 rel_code = ICMP_HOST_UNREACH;
460 }
461 }
462
463 icmp_send(skb2, rel_type, rel_code, rel_info);
464 kfree_skb(skb2);
465 return 0;
466#endif
467} 339}
468 340
469static inline void ipip_ecn_decapsulate(const struct iphdr *outer_iph, 341static inline void ipip_ecn_decapsulate(const struct iphdr *outer_iph,