Date: Thu, 24 Jan 2008 19:08:25 +0100 From: "Felix J. Ogris" <fjo-lists@ogris.de> To: <freebsd-net@freebsd.org> Subject: carp(4) ip loadbalancing (patch included) Message-ID: <C3BE92AA.BF4E1%fjo-lists@ogris.de>
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> This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. --B_3284046509_3507725 Content-type: text/plain; charset="US-ASCII" Content-transfer-encoding: 7bit Hi, I have extended ip_carp.c to provide loadbalancing on an ip basis, eg. to setup an active/active cluster. The algorithm is quite simple. Each cluster consists of N nodes. If an IPv4/IPv6 packet reaches node X, then it evaluates X == N mod source_address_of_IP_packet. If this is true, then the node will process that packet (carp_forus() returns 1). I had to introduce a new carp type (#define CARP_HELO 0x00) which by default is multicasted every 3 seconds (advertising base). Each node maintains a list of its IPv4 and IPv6 neighbours. Neighbours are timed out after 3 * advbase seconds. Network layer protocols other than IPv4/IPv6 are handled by the carp master. TCP packets, which have their ACK flag set or their SYN flag not set, are checked for an entry in the syncache or in tcbinfo. If an entry is found, then that TCP packet will not be handled by the current node (carp_forus() returns 0). This guarantees that an established TCP connection will stick to a host, even if a dead node reenters the cluster. I have put my patch (against 6.3-RELEASE) under the same license as the FreeBSD kernel itself. So feel free to apply it to the official tree - or to punish me for my lousy work :-) Regards, Felix --B_3284046509_3507725 Content-type: application/octet-stream; name="carp_aa.patch" Content-disposition: attachment; filename="carp_aa.patch" Content-transfer-encoding: base64 ZGlmZiAtZHJ1IHN5czAvbmV0L2lmX2JyaWRnZS5jIHN5cy9uZXQvaWZfYnJpZGdlLmMKLS0t IHN5czAvbmV0L2lmX2JyaWRnZS5jCTIwMDctMTItMjEgMDU6MzA6NDcuMDAwMDAwMDAwICsw MDAwCisrKyBzeXMvbmV0L2lmX2JyaWRnZS5jCTIwMDgtMDEtMjMgMjM6Mjk6MDIuMDAwMDAw MDAwICswMDAwCkBAIC0yMTc2LDEwICsyMTc2LDEwIEBACiAjaWZkZWYgREVWX0NBUlAKICMg ICBkZWZpbmUgT1JfQ0FSUF9DSEVDS19XRV9BUkVfRFNUKGlmYWNlKSBcCiAJfHwgKChpZmFj ZSktPmlmX2NhcnAgXAotCSAgICAmJiBjYXJwX2ZvcnVzKChpZmFjZSktPmlmX2NhcnAsIGVo LT5ldGhlcl9kaG9zdCkpCisJICAgICYmIGNhcnBfZm9ydXMoKGlmYWNlKS0+aWZfY2FycCwg ZWgtPmV0aGVyX2Rob3N0LCBtKSkKICMgICBkZWZpbmUgT1JfQ0FSUF9DSEVDS19XRV9BUkVf U1JDKGlmYWNlKSBcCiAJfHwgKChpZmFjZSktPmlmX2NhcnAgXAotCSAgICAmJiBjYXJwX2Zv 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