Function ng_bpf_newhook

freebsd/netgraph/ng_bpf.c:272–299

* Add a hook */

 * Add a hook
 */
static int
ng_bpf_newhook(node_p node, hook_p hook, const char *name)
{
	hinfo_p hip;
	hook_p tmp;
	int error;

	/* Create hook private structure */
	hip = malloc(sizeof(*hip), M_NETGRAPH_BPF, M_NOWAIT | M_ZERO);
	if (hip == NULL)
		return (ENOMEM);
	hip->hook = hook;
	NG_HOOK_SET_PRIVATE(hook, hip);

	/* Add our reference into other hooks data. */
	NG_NODE_FOREACH_HOOK(node, ng_bpf_addrefs, hook, tmp);

	/* Attach the default BPF program */
	if ((error = ng_bpf_setprog(hook, &ng_bpf_default_prog)) != 0) {
		free(hip, M_NETGRAPH_BPF);
		NG_HOOK_SET_PRIVATE(hook, NULL);
		return (error);
	}

	/* Set hook name */
	strlcpy(hip->prog->thisHook, name, sizeof(hip->prog->thisHook));
	return (0);
}

/*
 * Receive a control message