Date: Wed, 24 Apr 2013 20:01:23 +0400 From: "Alexander V. Chernikov" <melifaro@FreeBSD.org> To: freebsd-ipfw@freebsd.org Cc: luigi@freebsd.org Subject: [patch] ipfw interface tracking and opcode rewriting Message-ID: <517801D3.5040502@FreeBSD.org>
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This is a multi-part message in MIME format. --------------060008050505010104000604 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hello list! Currently ipfw uses strncmp() function to do interface matching which is quite slow. Additionally, ipfw_insn_if opcode is quite big and given that struct ip_fw occupy 48 bytes (without first instruction) which gives us good chance that part of interface name will be on the second cache line on amd64. Pure synthetic testing (ipfw with 1 and 2 'ipfw count ip from any to any recv ifaceX') shows about 3.8% performance loss (190kpps out of 5.1 mpps) for each rule, while indexed version shows about 2.0% and 1.2% for first and second rule. Additionally, our production (8.3-based firewalls with old strncmp) shows about 40% kernel time spent in strncmp on 1-2mpps (each packet traverses 5-6 such rules). Here is the patch which does the following: 1) adds interface tracking for ipfw. Every interface is tracked regardless of its usage in the ruleset. This simplifies locking and makes easier to port such functionality to userland. 2) adds general opcode rewriting system permitting kernel to algorithmically (stateless) or statefully (involving extrernal data) rewrite user-supplied opcodes with possible size change. This can be used to deprecate opcodes which are now superseded by newer ones while keeping ABI (and we currently have such opcodes). 3) Store (and track) inderface index for non-wildcard interface inside opcode. If there are no objections I would like to commit (possibly updated vesrion) in the middle of the next week. --------------060008050505010104000604 Content-Type: text/plain; charset=UTF-8; name="ip_fw_rewrite3.diff" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="ip_fw_rewrite3.diff" SW5kZXg6IHN5cy9uZXRpbmV0L2lwX2Z3LmgKPT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gc3lzL25ldGlu ZXQvaXBfZncuaAkocmV2aXNpb24gMjQ4NzA0KQorKysgc3lzL25ldGluZXQvaXBfZncuaAko d29ya2luZyBjb3B5KQpAQCAtMzQxLDYgKzM0MSw3IEBAIHR5cGVkZWYgc3RydWN0CV9pcGZ3 X2luc25faWYgewogCXVuaW9uIHsKIAkJc3RydWN0IGluX2FkZHIgaXA7CiAJCWludCBnbG9i OworCQl1bnNpZ25lZCBpbnQgaWZfaWR4OwkvKiBJbnRlcmZhY2UgaW5kZXggKGtlcm5lbCkg Ki8KIAl9IHA7CiAJY2hhciBuYW1lW0lGTkFNU0laXTsKIH0gaXBmd19pbnNuX2lmOwpAQCAt NDk1LDYgKzQ5Niw4IEBAIHR5cGVkZWYgc3RydWN0IF9pcGZ3X2luc25faWNtcDYgewogICoJ cXVldWUoMykgbWFjcm9zIGZvciBwb3J0YWJpbGl0eSBhbmQgcmVhZGFiaWxpdHkuCiAgKi8K 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