$NetBSD: patch-ca,v 1.1.1.1 1999/10/08 04:34:43 dbj Exp $

--- /dev/null	Mon Sep 27 01:09:07 1999
+++ netbsd-1.4/lkm_mppe.c	Mon Sep 27 02:03:12 1999
@@ -0,0 +1,116 @@
+/*	NetBSD	*/
+/*
+ * Copyright (c) 1999 Darrin B. Jewell
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by Darrin B. Jewell
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/conf.h>
+#include <sys/exec.h>
+#include <sys/lkm.h>
+
+#include <sys/tty.h>
+#include <sys/ttycom.h>
+
+MOD_MISC("mppe");
+
+extern struct compressor ppp_mppe;
+extern struct compressor *ppp_compressors[];
+extern int mppe_in_use;
+
+int	mppe_lkmentry __P((struct lkm_table *, int, int));
+int	mppe_lkm_load __P((struct lkm_table *, int));
+
+int
+mppe_lkm_load(lkmtp, cmd)
+		struct lkm_table *lkmtp;
+		int cmd;
+{
+	int i;
+	if (lkmexists(lkmtp)) return EEXIST;
+
+	for(i=0;i<7;i++) {
+		if (ppp_compressors[i] == NULL) {
+			ppp_compressors[i] = &ppp_mppe;
+			ppp_compressors[i+1] = NULL;
+			break;
+		}
+	}
+	if (i==7) {
+		printf("MPPE: no free compressor slots\n");
+		return ENODEV;
+	}
+
+	printf("MPPE: loaded into ppp at slot %d\n",i);
+
+	return 0;
+}
+
+int
+mppe_lkm_unload(lkmtp, cmd)
+		struct lkm_table *lkmtp;
+		int cmd;
+{
+	int i;
+	if (mppe_in_use) {
+		printf("MPPE: cannot unload lkm while in use (count=%d)\n",
+			mppe_in_use);
+		return EBUSY;
+	}
+	for(i=0;ppp_compressors[i];i++) {
+		if (ppp_compressors[i] == &ppp_mppe) break;
+	}
+	if (ppp_compressors[i] == NULL) {
+		printf("MPPE: cannot find mppe in ppp compressor slots\n");
+		return ENODEV;
+	}
+	printf("MPPE: unloaded from ppp at slot %d\n",i);
+	do {
+		ppp_compressors[i] = ppp_compressors[i+1];
+	} while(ppp_compressors[i++]);
+
+	return 0;
+}
+
+int
+mppe_lkm_stat(lkmtp, cmd)
+		struct lkm_table *lkmtp;
+		int cmd;
+{
+	printf("MPPE: use count %d\n",mppe_in_use);
+	return 0;
+}
+
+int
+mppe_lkmentry(lkmtp, cmd, ver)
+	struct lkm_table *lkmtp;
+	int cmd, ver;
+{
+	DISPATCH(lkmtp, cmd, ver, mppe_lkm_load,mppe_lkm_unload,mppe_lkm_stat);
+}