Dummynet AQM v0.1- CoDel and FQ-CoDel for FreeBSD's ipfw/dummynet

[Don Lewis]

On 26 Feb, Rasool Al-Saadi wrote:
> Dear all,
> 
> I would like to announce that we (myself and Grenville Armitage) released Dummynet AQM v0.1, which is an independent implementation of CoDel and FQ-CoDel for FreeBSD's ipfw/dummynet framework, based on the IETF  CoDel [1] and FQ-CoDel [2] Internet-Drafts.
> We prepared patches for FreeBSD11-CURRENT-r295345  and FreeBSD 10.x-RELEASE (10.0, 10.1, 10.2), and a technical report  of our implementation.
> 
> Patches and documentation can be found in:
> http://caia.swin.edu.au/freebsd/aqm

Without the patch below, the dummynet module fails to load

# kldload dummynet.ko
kldload: can't load dummynet.ko: No such file or directory

and the following is printed to /var/log/messages:

link_elf: symbol sysctl__net_inet_ip_dummynet_children undefined

I believe this patch is needed for FreeBSD 11 and all FreeBSD 10
releases.

--- sys/netpfil/ipfw/ip_dn_io.c.prev	2016-03-06 00:51:38.012058648 -0800
+++ sys/netpfil/ipfw/ip_dn_io.c	2016-03-08 21:54:47.036921030 -0800
@@ -154,7 +154,7 @@
 
 SYSCTL_DECL(_net_inet);
 SYSCTL_DECL(_net_inet_ip);
-static SYSCTL_NODE(_net_inet_ip, OID_AUTO, dummynet, CTLFLAG_RW, 0, "Dummynet");
+SYSCTL_NODE(_net_inet_ip, OID_AUTO, dummynet, CTLFLAG_RW, 0, "Dummynet");
 
 /* wrapper to pass dn_cfg fields to SYSCTL_* */
 //#define DC(x)	(&(VNET_NAME(_base_dn_cfg).x))