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Subject: [Bug 194453] [dummynet] pipe config bw parameter is limited to
 2Gbits per second
Date: Mon, 20 Oct 2014 20:54:20 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194453

Hiren Panchasara <hiren@FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|Needs Triage                |In Discussion
                 CC|                            |hiren@FreeBSD.org

--- Comment #2 from Hiren Panchasara <hiren@FreeBSD.org> ---
(In reply to boba from comment #0)
> It's impossible to create "pipe" with bandwidth higher than 2Gbits per
> second. Possible due to "signed" type of variable.
> 
> # ipfw pipe 1 config bw 2700mbit/s
> ipfw: bandwidth too large

I think you are right that its overflowing because of "signed" type.

A simple change like this may fix the problem:

Index: dummynet.c
===================================================================
--- dummynet.c  (revision 270969)
+++ dummynet.c  (working copy)
@@ -546,7 +546,7 @@
                if_name[namelen] = '\0';
                *bandwidth = 0;
        } else {        /* read bandwidth value */
-               int bw;
+               uint32_t bw;
                char *end = NULL;

                bw = strtoul(arg, &end, 0);

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