diff options
| -rw-r--r-- | extensions/libxt_string.man | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/extensions/libxt_string.man b/extensions/libxt_string.man index 2a470ece..efdda492 100644 --- a/extensions/libxt_string.man +++ b/extensions/libxt_string.man @@ -7,9 +7,13 @@ Select the pattern matching strategy. (bm = Boyer-Moore, kmp = Knuth-Pratt-Morri Set the offset from which it starts looking for any matching. If not passed, default is 0. .TP \fB\-\-to\fP \fIoffset\fP -Set the offset up to which should be scanned. That is, byte \fIoffset\fP-1 -(counting from 0) is the last one that is scanned. +Set the offset up to which should be scanned. If the pattern does not start +within this offset, it is not considered a match. If not passed, default is the packet size. +A second function of this parameter is instructing the kernel how much data +from the packet should be provided. With non-linear skbuffs (e.g. due to +fragmentation), a pattern extending past this offset may not be found. Also see +the related note below about Boyer-Moore algorithm in these cases. .TP [\fB!\fP] \fB\-\-string\fP \fIpattern\fP Matches the given pattern. |