net: The world is not perfect patch.
Unless there will be any objection here, I suggest consider the
following patch which simply removes the code for the
-DI_WISH_WORLD_WERE_PERFECT in the three methods which use it.
The compilation errors we get when using -DI_WISH_WORLD_WERE_PERFECT
show that this code was not built and not used for really a long time.
Signed-off-by: Rami Rosen <ramirose@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 5a6fab9..3de6ffd 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -403,9 +403,8 @@
static int ipip6_err(struct sk_buff *skb, u32 info)
{
-#ifndef I_WISH_WORLD_WERE_PERFECT
-/* It is not :-( All the routers (except for Linux) return only
+/* All the routers (except for Linux) return only
8 bytes of packet payload. It means, that precise relaying of
ICMP in the real Internet is absolutely infeasible.
*/
@@ -462,92 +461,6 @@
out:
read_unlock(&ipip6_lock);
return err;
-#else
- struct iphdr *iph = (struct iphdr*)dp;
- int hlen = iph->ihl<<2;
- struct ipv6hdr *iph6;
- const int type = icmp_hdr(skb)->type;
- const int code = icmp_hdr(skb)->code;
- int rel_type = 0;
- int rel_code = 0;
- int rel_info = 0;
- struct sk_buff *skb2;
- struct rt6_info *rt6i;
-
- if (len < hlen + sizeof(struct ipv6hdr))
- return;
- iph6 = (struct ipv6hdr*)(dp + hlen);
-
- switch (type) {
- default:
- return;
- case ICMP_PARAMETERPROB:
- if (icmp_hdr(skb)->un.gateway < hlen)
- return;
-
- /* So... This guy found something strange INSIDE encapsulated
- packet. Well, he is fool, but what can we do ?
- */
- rel_type = ICMPV6_PARAMPROB;
- rel_info = icmp_hdr(skb)->un.gateway - hlen;
- break;
-
- case ICMP_DEST_UNREACH:
- switch (code) {
- case ICMP_SR_FAILED:
- case ICMP_PORT_UNREACH:
- /* Impossible event. */
- return;
- case ICMP_FRAG_NEEDED:
- /* Too complicated case ... */
- return;
- default:
- /* All others are translated to HOST_UNREACH.
- rfc2003 contains "deep thoughts" about NET_UNREACH,
- I believe, it is just ether pollution. --ANK
- */
- rel_type = ICMPV6_DEST_UNREACH;
- rel_code = ICMPV6_ADDR_UNREACH;
- break;
- }
- break;
- case ICMP_TIME_EXCEEDED:
- if (code != ICMP_EXC_TTL)
- return;
- rel_type = ICMPV6_TIME_EXCEED;
- rel_code = ICMPV6_EXC_HOPLIMIT;
- break;
- }
-
- /* Prepare fake skb to feed it to icmpv6_send */
- skb2 = skb_clone(skb, GFP_ATOMIC);
- if (skb2 == NULL)
- return 0;
- dst_release(skb2->dst);
- skb2->dst = NULL;
- skb_pull(skb2, skb->data - (u8*)iph6);
- skb_reset_network_header(skb2);
-
- /* Try to guess incoming interface */
- rt6i = rt6_lookup(dev_net(skb->dev), &iph6->saddr, NULL, NULL, 0);
- if (rt6i && rt6i->rt6i_dev) {
- skb2->dev = rt6i->rt6i_dev;
-
- rt6i = rt6_lookup(dev_net(skb->dev),
- &iph6->daddr, &iph6->saddr, NULL, 0);
-
- if (rt6i && rt6i->rt6i_dev && rt6i->rt6i_dev->type == ARPHRD_SIT) {
- struct ip_tunnel *t = netdev_priv(rt6i->rt6i_dev);
- if (rel_type == ICMPV6_TIME_EXCEED && t->parms.iph.ttl) {
- rel_type = ICMPV6_DEST_UNREACH;
- rel_code = ICMPV6_ADDR_UNREACH;
- }
- icmpv6_send(skb2, rel_type, rel_code, rel_info, skb2->dev);
- }
- }
- kfree_skb(skb2);
- return 0;
-#endif
}
static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb)