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Currently we have tables identified by their names in userland with internal kernel-assigned indices. This works the following way: When userland wishes to communicate with kernel to add or change rule(s), it makes indexed sorted array of table names (internally ipfw_obj_ntlv entries), and refer to indices in that array in rule manipulation. Prior to committing new rule to the ruleset kernel a) finds all referenced tables, bump their refcounts and change values inside the opcodes to be real kernel indices b) auto-creates all referenced but not existing tables and then do a) for them. Kernel does almost the same when exporting rules to userland: prepares array of used tables in all rules in range, and prepends it before the actual ruleset retaining actual in-kernel indexes for that. There is also special translation layer for legacy clients which is able to provide 'real' indices for table names (basically doing atoi()). While it is arguable that every subsystem really needs names instead of numbers, there are several things that should be noted: 1) every non-singleton subsystem needs to store its runtime state somewhere inside ipfw chain (and be able to get it fast) 2) we can't assume object numbers provided by humans will be dense. Existing nat implementation (O(n) access and LIST inside chain) is a good example. Hence the following: * Convert table-centric rewrite code to be more generic, callback-based * Move most of the code from ip_fw_table.c to ip_fw_sockopt.c * Provide abstract API to permit subsystems convert their objects between userland string identifier and in-kernel index. (See struct opcode_obj_rewrite) for more details * Create another per-chain index (in next commit) shared among all subsystems * Convert current NAT44 implementation to use new API, O(1) lookups, shared index and names instead of numbers (in next commit). Sponsored by: Yandex LLC |
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| crypto | ||
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| gnu | ||
| include | ||
| kerberos5 | ||
| lib | ||
| libexec | ||
| release | ||
| rescue | ||
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| sys | ||
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| tools | ||
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| .arcconfig | ||
| .arclint | ||
| COPYRIGHT | ||
| LOCKS | ||
| MAINTAINERS | ||
| Makefile | ||
| Makefile.inc1 | ||
| ObsoleteFiles.inc | ||
| README | ||
| UPDATING | ||
This is the top level of the FreeBSD source directory. This file was last revised on: $FreeBSD$ For copyright information, please see the file COPYRIGHT in this directory (additional copyright information also exists for some sources in this tree - please see the specific source directories for more information). The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree. See build(7) and http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html for more information, including setting make(1) variables. The `buildkernel` and `installkernel` targets build and install the kernel and the modules (see below). Please see the top of the Makefile in this directory for more information on the standard build targets and compile-time flags. Building a kernel is a somewhat more involved process. See build(7), config(8), and http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html for more information. Note: If you want to build and install the kernel with the `buildkernel` and `installkernel` targets, you might need to build world before. More information is available in the handbook. The kernel configuration files reside in the sys/<arch>/conf sub-directory. GENERIC is the default configuration used in release builds. NOTES contains entries and documentation for all possible devices, not just those commonly used. Source Roadmap: --------------- bin System/user commands. cddl Various commands and libraries under the Common Development and Distribution License. contrib Packages contributed by 3rd parties. crypto Cryptography stuff (see crypto/README). etc Template files for /etc. games Amusements. gnu Various commands and libraries under the GNU Public License. Please see gnu/COPYING* for more information. include System include files. kerberos5 Kerberos5 (Heimdal) package. lib System libraries. libexec System daemons. release Release building Makefile & associated tools. rescue Build system for statically linked /rescue utilities. sbin System commands. secure Cryptographic libraries and commands. share Shared resources. sys Kernel sources. tests Regression tests which can be run by Kyua. See tests/README for additional information. tools Utilities for regression testing and miscellaneous tasks. usr.bin User commands. usr.sbin System administration commands. For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/synching.html