Import IP Filter v3.1.7 into FreeBSD tree

1 files changed, 83 insertions, 0 deletions

diff --git a/contrib/ipfilter/ipl_ldev.c b/contrib/ipfilter/ipl_ldev.c
new file mode 100644
index 0000000..a289325
--- /dev/null
+++ b/contrib/ipfilter/ipl_ldev.c
@@ -0,0 +1,83 @@
+/*
+ * (C)opyright 1993,1994,1995 by Darren Reed.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and due credit is given
+ * to the original author and the contributors.
+ */
+
+/*
+ * routines below for saving IP headers to buffer
+ */
+int iplopen(struct inode * inode, struct file * filp)
+{
+	u_int	min = MINOR(inode->i_rdev);
+
+	if (flags & FWRITE)
+		return ENXIO;
+	if (min)
+		return ENXIO;
+	iplbusy++;
+	return 0;
+}
+
+
+int iplclose(struct inode * inode, struct file * filp)
+{
+	u_int	min = MINOR(inode->i_rdev);
+
+	if (min)
+		return ENXIO;
+	iplbusy--;
+	return 0;
+}
+
+
+/*
+ * iplread/ipllog
+ * all three of these must operate with at least splnet() lest they be
+ * called during packet processing and cause an inconsistancy to appear in
+ * the filter lists.
+ */
+int iplread(struct inode *inode, struct file *file, char *buf, int count)
+{
+	register int	ret, s;
+	register size_t	sz, sx;
+	int error;
+
+	if (!uio->uio_resid)
+		return 0;
+	while (!iplused) {
+		error = SLEEP(iplbuf, "ipl sleep");
+		if (error)
+			return error;
+	}
+
+	SPLNET(s);
+
+	ret = sx = sz = MIN(count, iplused);
+	if (iplh < iplt)
+		sz = MIN(sz, LOGSIZE - (iplt - iplbuf));
+	sx -= sz;
+
+	memcpy_tofs(buf, iplt, sz);
+	buf += sz;
+	iplt += sz;
+	iplused -= sz;
+	if ((iplh < iplt) && (iplt == iplbuf + LOGSIZE))
+		iplt = iplbuf;
+
+	if (sx) {
+		memcpy_tofs(buf, iplt, sx);
+		ret += sx;
+		iplt += sx;
+		iplused -= sx;
+		if ((iplh < iplt) && (iplt == iplbuf + LOGSIZE))
+			iplt = iplbuf;
+	}
+	if (!iplused)	/* minimise wrapping around the end */
+		iplh = iplt = iplbuf;
+
+	SPLX(s);
+	return ret;
+}