netgraph(3) NGM_KSOCKET_BIND

[Crist J. Clark]

OK, an easy one. I am trying to do some netgraph(3) coding in
userland. From how I read the documentation, this should work. Before
I go learn all of the netraph(4) kernel code to understand the error
message, could someone tell me how this is supposed to look? I'm sure
it's something obvious that I have missed.

The attached test program returns,

  # ./ngtest 
  ngtest: failed to bind ksocket: Invalid argument

The program,

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>

#include <netgraph.h>
#include <netgraph/ng_ksocket.h>
#include <netgraph/ng_message.h>
#include <netgraph/ng_tee.h>

#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>

#define DEFAULT_PORT    10000
#define OUR_HOOK_CTL    "ctl_hook"

int main()
{
        int     cs, ds;
        struct sockaddr_in      laddr;
        struct ngm_mkpeer       ngmkp;

        if (NgMkSockNode(NULL, &cs, &ds) == -1)
                err(errno, "failed to create netgraph socket");

        strcpy(ngmkp.type, NG_KSOCKET_NODE_TYPE);
        strcpy(ngmkp.ourhook, OUR_HOOK_CTL);
        strcpy(ngmkp.peerhook, "inet/dgram/udp");
        if (NgSendMsg(cs, ".", NGM_GENERIC_COOKIE, NGM_MKPEER,
            &ngmkp, sizeof ngmkp) == -1)
                err(errno, "failed to create ksocket node");

        bzero(&laddr, sizeof laddr);
        laddr.sin_family = AF_INET;
        laddr.sin_addr.s_addr = INADDR_ANY;
        laddr.sin_port = htons(DEFAULT_PORT);
        if (NgSendMsg(cs, OUR_HOOK_CTL, NGM_KSOCKET_COOKIE, NGM_KSOCKET_BIND,
            &laddr, sizeof laddr) == -1)
                err(errno, "failed to bind ksocket");

        return 0;
}

-- 
Crist J. Clark                     |     cjclark at alum.mit.edu
                                   |     cjclark at jhu.edu
http://people.freebsd.org/~cjc/    |     cjc at freebsd.org