Hello,
From: Ken-ichirou MATSUZAWA <[EMAIL PROTECTED]>
Subject: checksum of lsrr
Date: Wed, 04 Jul 2007 22:28:24 +0900 (JST)
> if we change destination address, we need recompute not only ip
> checksum but also tcp's, don't we?
I was ashamed of myself for much confused. My simple story is:
rt1 ---- rt2 ---- mybox
rt1 is far from rt2 and when I changed bandwith between rt1 and rt2,
I want to confirm if it was changed correctly. A idea occured to me
is using lsrr. Then I tried with nc but it was not worked. To accept
packet from rt2 to mybox which src and dst address are mybox, I
changed:
--- net/ipv4/fib_frontend.c.orig 2007-07-23 00:01:17.000000000 +0900
+++ net/ipv4/fib_frontend.c 2007-07-23 00:03:11.000000000 +0900
@@ -206,7 +206,7 @@
if (fib_lookup(&fl, &res))
goto last_resort;
- if (res.type != RTN_UNICAST)
+ if (res.type != RTN_UNICAST && likely(res.type != RTN_LOCAL))
goto e_inval_res;
*spec_dst = FIB_RES_PREFSRC(res);
fib_combine_itag(itag, &res);
Would you tell me is this acceptable? I'm afraid of security issue.
thanks,
-
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