Bryant Eadon wrote:
Joe Pellegrino wrote:
OK so here it goes. I actually have two seperate questions involving
netgraph, I am new to this subject so please bare with me. If there is
a better way to achieve these goals too, please suggest them but I
think netgraph is the way to go.
The first part involves allowing a userland program to communicate
with a kernel module, similar to how netlink works in Linux. The
second part involves intercepting network packets and possibly
manipulating them before they are allowed to proceed, similar to how
netfilter works. I believe I can do both of these with the netgraph
(ng_socket and possibly ng_ether). I haven't looked closely at
ng_ether yet so I'll focus on ng_socket.
I have been able to create a ng_socket (Control and Data) using the
socket call as described in "All About NetGraphs" and the man page.
I've also been able to 'name' the node using bind. I was able to
verify this using ngctl. I know (from the man page) I should
eventually be able to send/receive using the sendto/recvfrom functions
once the connection is established. But beyond this I don't know how
to proceed. So the question is what are the next steps. For example:
Although I see a named netgraph node there are no hooks. ng_socket
says it supports an arbitrary number of hooks so how do I create the
hooks? Then of course how do I connect them.
Of course I realize that I proabably need to create a node on the
kernel side so which type of netgraph node would be suggested? How is
it created and then hooked to the ng_socket?
Again I am looking to allow some IPC between a userland program and a
kernel module similar to the Linux netlink. I've been through most man
pages and can't seem to find a lot of good documentation or example
code so I am hoping to get some pointers here. BTW If this is the
wrong list please directly to the right place to ask. Thanks in advance.
Have you looked into how "systat -ifstat" works ?
Whoops. Wrong thread. Please ignore.
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