[4037] in linux-net channel archive
Re: ICMP Redirect...
daemon@ATHENA.MIT.EDU (Zach B.)
Fri Aug 16 04:30:44 1996
Date: Thu, 15 Aug 1996 15:56:28 -0700 (PDT)
From: "Zach B." <zab@teleport.com>
To: Dan Merillat <harik@ao.net>
cc: Linux-Net List <linux-net@vger.rutgers.edu>
In-Reply-To: <Pine.LNX.3.93.960815021038.10809A-100000@eola.ao.net>
On Thu, 15 Aug 1996, Dan Merillat wrote:
> Ok, I was poking thru the kernel because I get a lot of ICMP redirects.
> Now, I know getting one means to fix your routes. However, to much
> information is thrown away. All that gets sysloged is the host that sent
> it! I tried a quickie patch to display some of the other fields but now
> ICMP's just oops my kernel, so I screwed something up. If someone could
> write a one-liner and send it to me I'd appreciate it. I don't know
> enough about ICMP fields to write it well, and the development time
> is killer (since I am supposed to be working on other things... grr.)
> Jobs arn't fun when they conflict with work I want to do.
>
>
> --Dan
Well I'm far too lazy to producce a diff :). The relevant bits are in
net/ipv4/icmp.c around line 827 (someone holler if I'm doing this wrong):
case ICMP_REDIR_HOST:
/*
* Add better route to host.
* But first check that the redirect
* comes from the old gateway..
* And make sure it's an ok host address
* (not some confused thing sending our
* address)
*/
printk(KERN_INFO "ICMP redirect from %s\n", in_ntoa(source));
ip_rt_redirect(source, ip, icmph->un.gateway, dev);
break;
simply change that to
case ICMP_REDIR_HOST:
/*
* Add better route to host.
* But first check that the redirect
* comes from the old gateway..
* And make sure it's an ok host address
* (not some confused thing sending our
* address)
*/
printk(KERN_INFO "icmp: ICMP host redirect accepted. dest = %lX,
orig gw = %lX, \"new\" gw = %lX, device = %s.\n", ntohl(ip),
ntohl(source), ntohl(icmph->un.gateway), dev->name));
ip_rt_redirect(source, ip, icmph->un.gateway, dev);
break;
minus the evil wrapping of course. Oh, this is from a 2.0.10 tree, but
I'm sure more recent ones are similar. Oh, while I'm here.. has anyone
seen a version of ipsend that has been patched up for the 2.0 sources?
zach
