[git.ipfire.org] IPFire 2.x development tree branch, master, updated. 1b34f6cd64a7344220e69822175b26849caaa823

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- Log -----------------------------------------------------------------
commit 1b34f6cd64a7344220e69822175b26849caaa823
Author: Michael Tremer <michael.tremer(a)ipfire.org>
Date:   Thu Jan 22 16:06:25 2015 +0100

    firewall: Fix SNAT rules that use a default network as source
    
    In the POSTROUTING chain using -i intf0 does not work at all.
    We now only use the -s parameter to figure out if the rule applied.
    The filter chain still uses -i and -o to match patches not only
    by the network address, but also by the incoming/outgoing interface.

-----------------------------------------------------------------------

Summary of changes:
 config/firewall/rules.pl | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

Difference in files:
diff --git a/config/firewall/rules.pl b/config/firewall/rules.pl
index a475e2d..97b8897 100755
--- a/config/firewall/rules.pl
+++ b/config/firewall/rules.pl
@@ -368,20 +368,12 @@ sub buildrules {
 						push(@source_options, ("-s", $source));
 					}
 
-					if ($source_intf) {
-						push(@source_options, ("-i", $source_intf));
-					}
-
 					# Prepare destination options.
 					my @destination_options = ();
 					if ($destination) {
 						push(@destination_options, ("-d", $destination));
 					}
 
-					if ($destination_intf) {
-						push(@destination_options, ("-o", $destination_intf));
-					}
-
 					# Add time constraint options.
 					push(@options, @time_options);
 
@@ -476,6 +468,17 @@ sub buildrules {
 						}
 					}
 
+					# Add source and destination interface to the filter rules.
+					# These are supposed to help filtering forged packets that originate
+					# from BLUE with an IP address from GREEN for instance.
+					if ($source_intf) {
+						push(@source_options, ("-i", $source_intf));
+					}
+
+					if ($destination_intf) {
+						push(@destination_options, ("-o", $destination_intf));
+					}
+
 					push(@options, @source_options);
 					push(@options, @destination_options);
 


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