Register a new frame reception

[Carlos Guimarães]

 Hi,

I need to received some action frames to process in userspace. I'm
registering its receptions by sending a @NL80211_CMD_REGISTER_ACTION
message. Everything seems correct until this point. The problem is that I
can't receive anything at userspace. I defined the handler and wait for
incoming messages but nothing seems to arrive.

Next it's the code I use to register and wait for the actions frames.

int mac80211_reg_action(const char *interface) {
    struct nl_sock *nl_handle = NULL;
    struct nl_cache *nl_cache = NULL;
    struct genl_family *nl80211 = NULL;
    struct nl_msg *msg;

    // Init mac80211 connection
    if (mac80211_connect(interface,
                         (void **) &nl_handle,
                         (void **) &nl_cache,
                         (void **) &nl80211) < 0) {
        return -1;
    }

    if ((msg = nlmsg_alloc()) == NULL) {
        mac80211_disconnect(nl_handle);
        return -2;
    }
    //

    // Create message to send to mac80211
    genlmsg_put(msg, 0, 0, genl_family_get_id(nl80211), 0, 0,
NL80211_CMD_REGISTER_ACTION, 0);
    NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, if_nametoindex(interface));
    nla_put_u8(msg, NL80211_ATTR_FRAME_MATCH, 2);

    if (nl_send_auto_complete(nl_handle, msg) < 0) {
nla_put_failure:
        nlmsg_free(msg);
        mac80211_disconnect(nl_handle);

        return errno;
    }
    //


    // wait for incoming messages
   struct nl_cb *cb;
    int err;

    cb = nl_cb_alloc(NL_CB_DEFAULT);

    err = 1;

    nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, valid_handler, NULL);
    nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, error_handler, &err);

    while (err > 0)
        nl_recvmsgs(nl_handle, cb);

     nlmsg_free(msg);

    return 0;
}

What could be wrong?

Thanks,
Carlos
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