I need a Linux testbed to test applications in an IPv6-only
environment. Unfortunately IPv6 cannot be enabled without also enabling
IPv4. Therefor I try to hide AF_INET from user space with the appended
patch.
It is a partial success in that AF_INET is no longer available to user
space, the kernel does not crash, TCP6 connections (ssh) work and UDP6
connections seem to work (DNS).
The drawback is that ICMP6 (ping6) does not work and that I think my
basic approach is ugly.
What could be a quick hack to get ICMP6 working in my scenario?
Would it be possible - with reasonable effort - to convert networking
code so that IPv6 no longer depends on IPv4 so that an IPv6-only
configuration can be created easily?
Thanks for your help,
-andi
--- net/ipv4/af_inet.c.orig 2004-10-29 15:01:42.000000000 +0200
+++ net/ipv4/af_inet.c 2004-11-04 11:57:11.000000000 +0100
@@ -1032,7 +1032,10 @@
* Tell SOCKET that we are alive...
*/
+#define HIDE_V4
+#ifndef HIDE_V4
(void)sock_register(&inet_family_ops);
+#endif
/*
* Add all the base protocols.
@@ -1066,9 +1069,11 @@
* Set the IP module up
*/
+#ifndef HIDE_V4
ip_init();
tcp_v4_init(&inet_family_ops);
+#endif
/* Setup TCP slab cache for open requests. */
tcp_init();
@@ -1078,7 +1083,9 @@
* Set the ICMP layer up
*/
+#ifndef HIDE_V4
icmp_init(&inet_family_ops);
+#endif
/*
* Initialise the multicast router
@@ -1093,7 +1100,9 @@
if(init_ipv4_mibs())
printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); ;
+#ifndef HIDE_V4
ipv4_proc_init();
+#endif
ipfrag_init();
--
| Andreas Maier Paris-Lodron University of Salzburg |
| (andi [at] cosy.sbg.ac.at) Department of Scientific Computing |
| Tel. +43/662/8044-6339 Jakob Haringerstr. 2 |
| Fax. +43/662/8044-172 5020 Salzburg / Austria, Europe |
|