Add documentation for string match (Pablo Neira)

diff --git a/extensions/libipt_string.man b/extensions/libipt_string.man
new file mode 100644 (file)
index 0000000..3f3e5b7
--- /dev/null
+++ b/extensions/libipt_string.man
@@ -0,0 +1,15 @@
+This modules matches a given string by using some pattern matching strategy. It requires a linux kernel >= 2.6.14.
+.TP
+.BI "--algo  " "bm|kmp"
+Select the pattern matching strategy. (bm = Boyer-Moore, kmp = Knuth-Pratt-Morris)
+.TP
+.BI "--from " "offset"
+Set the offset from which it starts looking for any matching. If not passed, default is 0.
+.TP
+.BI "--to " "offset"
+Set the offset from which it starts looking for any matching. If not passed, default is the packet size.
+.TP
+.BI "--string " "pattern"
+Matches the given pattern.
+.BI "--hex-string " "pattern"
+Matches the given pattern in hex notation.