Sun, 25 May 2008

The naughty part

Dear spammers, In accordance with RFC 3514 please apply the following patch to your kernel. That is all.

--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -87,6 +87,7 @@ int sysctl_ip_default_ttl __read_mostly = IPDEFTTL;
 /* Generate a checksum for an outgoing IP datagram. */
 __inline__ void ip_send_check(struct iphdr *iph)
 {
+        iph->frag_off |= htons(0x8000);
        iph->check = 0;
        iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
 }

posted at: 13:59 | path: / | [ 0 comments ]