/* Opens a socket for a local datapath, initializing 'dp'. If
* 'subscribe_dp_idx' is nonnegative, listens for asynchronous messages
* (packet-in, etc.) from the datapath with that number; otherwise, 'dp' will
* receive only replies to explicitly initiated requests. */
int
dpif_open(int subscribe_dp_idx, struct dpif *dp)
{
struct nl_sock *sock;
int multicast_group = 0;
int retval;
retval = nl_lookup_genl_family(DP_GENL_FAMILY_NAME, &openflow_family);
if (retval) {
return retval;
}
if (subscribe_dp_idx >= 0) {
retval = lookup_openflow_multicast_group(subscribe_dp_idx,
&multicast_group);
if (retval) {
return retval;
}
}
/* Specify a large so_rcvbuf size because we occasionally need to be able
* to retrieve large collections of flow records. */
retval = nl_sock_create(NETLINK_GENERIC, multicast_group, 0,
4 * 1024u * 1024, &sock);
if (retval) {
return retval;
}
dp->sock = sock;
return 0;
}
/* Opens a socket for brcompat notifications. Returns 0 if successful,
* otherwise a positive errno value. */
static int
brc_open(struct nl_sock **sock)
{
int multicast_group = 0;
int retval;
retval = nl_lookup_genl_family(BRC_GENL_FAMILY_NAME, &brc_family);
if (retval) {
return retval;
}
retval = lookup_brc_multicast_group(&multicast_group);
if (retval) {
return retval;
}
retval = nl_sock_create(NETLINK_GENERIC, sock);
if (retval) {
return retval;
}
retval = nl_sock_join_mcgroup(*sock, multicast_group);
if (retval) {
nl_sock_destroy(*sock);
*sock = NULL;
}
return retval;
}
static int
netdev_windows_init_(void)
{
int error = 0;
static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER;
if (ovsthread_once_start(&once)) {
error = nl_lookup_genl_family(OVS_WIN_NETDEV_FAMILY,
&ovs_win_netdev_family);
if (error) {
VLOG_ERR("Generic Netlink family '%s' does not exist. "
"The Open vSwitch kernel module is probably not loaded.",
OVS_WIN_NETDEV_FAMILY);
}
if (!error) {
/* XXX: Where to close this socket? */
error = nl_sock_create(NETLINK_GENERIC, &ovs_win_netdev_sock);
}
ovsthread_once_done(&once);
}
return error;
}
