1 files changed, 52 insertions, 0 deletions
diff --git a/src/layer.h b/src/layer.h
new file mode 100644
index 0000000..9920cb0
--- /dev/null
+++ b/src/layer.h
@@ -0,0 +1,52 @@
+/*-
+ * Copyright (c) 1999 Brian Somers <brian@Awfulhak.org>
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
+ *
+ * $FreeBSD: src/usr.sbin/ppp/layer.h,v 1.3.62.1 2010/12/21 17:10:29 kensmith Exp $
+ */
+
+#define	LAYER_ASYNC	2
+#define	LAYER_SYNC	3
+#define	LAYER_HDLC	4
+#define	LAYER_ACF	5
+#define	LAYER_PROTO	6
+#define	LAYER_LQR	7
+#define	LAYER_CCP	8
+#define	LAYER_VJ	9
+#define	LAYER_NAT	10
+
+#define	LAYER_MAX	10	/* How many layers we can handle on a link */
+
+struct mbuf;
+struct link;
+struct bundle;
+
+struct layer {
+  int type;
+  const char *name;
+  struct mbuf *(*push)(struct bundle *, struct link *, struct mbuf *,
+                       int pri, u_short *proto);
+  struct mbuf *(*pull)(struct bundle *, struct link *, struct mbuf *,
+                       u_short *);
+};