Function ng_vjc_rcvmsg

freebsd/netgraph/ng_vjc.c:290–392

* Receive a control message */

 * Receive a control message
 */
static int
ng_vjc_rcvmsg(node_p node, item_p item, hook_p lasthook)
{
	const priv_p priv = NG_NODE_PRIVATE(node);
	struct ng_mesg *resp = NULL;
	int error = 0;
	struct ng_mesg *msg;

	NGI_GET_MSG(item, msg);
	/* Check type cookie */
	switch (msg->header.typecookie) {
	case NGM_VJC_COOKIE:
		switch (msg->header.cmd) {
		case NGM_VJC_SET_CONFIG:
		    {
			struct ngm_vjc_config *const c =
				(struct ngm_vjc_config *) msg->data;

			if (msg->header.arglen != sizeof(*c))
				ERROUT(EINVAL);
			if ((priv->conf.enableComp || priv->conf.enableDecomp)
			    && (c->enableComp || c->enableDecomp))
				ERROUT(EALREADY);
			if (c->enableComp) {
				if (c->maxChannel > NG_VJC_MAX_CHANNELS - 1
				    || c->maxChannel < NG_VJC_MIN_CHANNELS - 1)
					ERROUT(EINVAL);
			} else
				c->maxChannel = NG_VJC_MAX_CHANNELS - 1;
			if (c->enableComp != 0 || c->enableDecomp != 0) {
				bzero(&priv->slc, sizeof(priv->slc));
				sl_compress_init(&priv->slc, c->maxChannel);
			}
			priv->conf = *c;
			break;
		    }
		case NGM_VJC_GET_CONFIG:
		    {
			struct ngm_vjc_config *conf;

			NG_MKRESPONSE(resp, msg, sizeof(*conf), M_NOWAIT);
			if (resp == NULL)
				ERROUT(ENOMEM);
			conf = (struct ngm_vjc_config *)resp->data;
			*conf = priv->conf;
			break;
		    }
		case NGM_VJC_GET_STATE:
		    {
			const struct slcompress *const sl0 = &priv->slc;
			struct slcompress *sl;
			u_int16_t index;
			int i;

			/* Get response structure */
			NG_MKRESPONSE(resp, msg, sizeof(*sl), M_NOWAIT);
			if (resp == NULL)
				ERROUT(ENOMEM);