netdev - [PATCH V3 2/2] bonding support for IPv6 transmit hashing

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <4FEE99EE.2000001@8192.net>
Date:	Fri, 29 Jun 2012 23:17:18 -0700
From:	John <linux@...2.net>
To:	netdev@...r.kernel.org
Subject: [PATCH V3 2/2] bonding support for IPv6 transmit hashing

diff --git a/Documentation/networking/bonding.txt b/Documentation/networking/bonding.txt
index bfea8a3..5db14fe 100644
--- a/Documentation/networking/bonding.txt
+++ b/Documentation/networking/bonding.txt
@@ -752,12 +752,22 @@ xmit_hash_policy
  		protocol information to generate the hash.

  		Uses XOR of hardware MAC addresses and IP addresses to
-		generate the hash.  The formula is
+		generate the hash.  The IPv4 formula is

  		(((source IP XOR dest IP) AND 0xffff) XOR
  			( source MAC XOR destination MAC ))
  				modulo slave count

+		The IPv6 forumla is
+
+		iphash =
+			(source ip quad 2 XOR dest IP quad 2) XOR
+			(source ip quad 3 XOR dest IP quad 3) XOR
+			(source ip quad 4 XOR dest IP quad 4)
+
+		((iphash >> 16) XOR (iphash >> 8) XOR iphash)
+			modulo slave count
+
  		This algorithm will place all traffic to a particular
  		network peer on the same slave.  For non-IP traffic,
  		the formula is the same as for the layer2 transmit
@@ -778,19 +788,30 @@ xmit_hash_policy
  		slaves, although a single connection will not span
  		multiple slaves.

-		The formula for unfragmented TCP and UDP packets is
+		The formula for unfragmented IPv4 TCP and UDP packets is

  		((source port XOR dest port) XOR
  			 ((source IP XOR dest IP) AND 0xffff)
  				modulo slave count

-		For fragmented TCP or UDP packets and all other IP
-		protocol traffic, the source and destination port
+		The formula for unfragmented IPv6 TCP and UDP packets is
+
+		iphash =
+			(source ip quad 2 XOR dest IP quad 2) XOR
+			(source ip quad 3 XOR dest IP quad 3) XOR
+			(source ip quad 4 XOR dest IP quad 4)
+
+		((source port XOR dest port) XOR
+			(iphash >> 16) XOR (iphash >> 8) XOR iphash)
+				modulo slave count
+
+		For fragmented TCP or UDP packets and all other IPv4 and
+		IPv6 protocol traffic, the source and destination port
  		information is omitted.  For non-IP traffic, the
  		formula is the same as for the layer2 transmit hash
  		policy.

-		This policy is intended to mimic the behavior of
+		The IPv4 policy is intended to mimic the behavior of
  		certain switches, notably Cisco switches with PFC2 as
  		well as some Foundry and IBM products.

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html