lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Thu, 7 Jan 2010 17:05:36 -0800
From:	Maciej ┼╗enczykowski <>
To:	David Miller <>
Subject: Re: [PATCH] IPv6: fix rt_lookup in pmtu_discovery

> This needs to do what the IPV4 side does, iterate over specific then
> "any" device index, doing a lookup for each case until the route is
> found, therefore starting from more specific and going towards less
> specific routes.

I've spoken with Tom and we can't quite seem to figure out what
exactly the code should be attempting to accomplish here.
Is checking the specific device index meant to deal with link local IPs?

As for the v4 code, I assume you're referring to ip_rt_frag_needed in

If so, shouldn't this sort of route lookup be abstracted away into
some function?
Path mtu discovery / fragmentation handling functions don't seem to be
the right place to be implementing route lookup policy.

Are you suggesting the following logic for ipv6:

rt = rt6_lookup(net, daddr, saddr, dev->ifindex, 0);
if (rt == NULL)
        rt = rt6_lookup(net, daddr, saddr, 0, 0);
if (rt == NULL)
        rt = rt6_lookup(net, daddr, 0, dev->ifindex, 0);
if (rt == NULL)
        rt = rt6_lookup(net, daddr, 0, 0, 0);
if (rt == NULL)

It's not clear to me what the last two lookups with saddr replaced
with 0 are for.

To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to
More majordomo info at

Powered by blists - more mailing lists