[zebra/linux] Use BPF to filter out responses, to try avoid netlink overruns

[zebra/linux] Use BPF to filter out responses, to try avoid netlink overruns

2008-05-29 Stephen Hemminger <stephen.hemminger@vyatta.com>

	* rt_netlink.c: (netlink_install_filter) BPF filter to catch and
	  drop responses to zebra's own route messages.
	  (kernel_init) add BPF filter on the netlink socket.