ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync/*-
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * Copyright (c) 2005 Paolo Pisati <piso@FreeBSD.org>
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * All rights reserved.
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync *
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * Redistribution and use in source and binary forms, with or without
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * modification, are permitted provided that the following conditions
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * are met:
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * 1. Redistributions of source code must retain the above copyright
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * notice, this list of conditions and the following disclaimer.
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * 2. Redistributions in binary form must reproduce the above copyright
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * notice, this list of conditions and the following disclaimer in the
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * documentation and/or other materials provided with the distribution.
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync *
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * SUCH DAMAGE.
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync */
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#include <sys/cdefs.h>
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync__FBSDID("$FreeBSD: src/sys/netinet/libalias/alias_dummy.c,v 1.1.8.1 2009/04/15 03:14:26 kensmith Exp $");
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync/*
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * Alias_dummy is just an empty skeleton used to demostrate how to write
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * a module for libalias, that will run unalterated in userland or in
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * kernel land.
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync */
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#ifdef _KERNEL
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#include <sys/param.h>
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#include <sys/kernel.h>
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#include <sys/module.h>
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#else
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#include <errno.h>
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#include <sys/types.h>
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#include <stdio.h>
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#endif
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#include <netinet/in_systm.h>
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#include <netinet/in.h>
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#include <netinet/ip.h>
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#include <netinet/udp.h>
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#ifdef _KERNEL
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#include <netinet/libalias/alias_local.h>
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#include <netinet/libalias/alias_mod.h>
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#else
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#include "alias_local.h"
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#include "alias_mod.h"
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#endif
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncstatic void
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncAliasHandleDummy(struct libalias *la, struct ip *ip, struct alias_data *ah);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsyncstatic int
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncfingerprint(struct libalias *la, struct ip *pip, struct alias_data *ah)
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync{
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync /*
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync * Check here all the data that will be used later, if any field
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * is empy/NULL, return a -1 value.
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync */
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync if (ah->dport == NULL || ah->sport == NULL || ah->lnk == NULL ||
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync ah->maxpktsize == 0)
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync return (-1);
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync /*
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync * Fingerprint the incoming packet, if it matches any conditions
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * return an OK value.
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync */
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync if (ntohs(*ah->dport) == 123
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync || ntohs(*ah->sport) == 456)
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync return (0); /* I know how to handle it. */
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync return (-1); /* I don't recognize this packet. */
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync}
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync/*
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync * Wrap in this general purpose function, the real function used to alias the
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * packets.
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync */
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsyncstatic int
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncprotohandler(struct libalias *la, struct ip *pip, struct alias_data *ah)
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync{
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync AliasHandleDummy(la, pip, ah);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync return (0);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync}
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync/*
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync * NOTA BENE: the next variable MUST NOT be renamed in any case if you want
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync * your module to work in userland, cause it's used to find and use all
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * the protocol handlers present in every module.
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync * So WATCH OUT, your module needs this variables and it needs it with
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * ITS EXACT NAME: handlers.
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync */
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncstruct proto_handler handlers [] = {
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync {
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync .pri = 666,
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync .dir = IN|OUT,
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync .proto = UDP|TCP,
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync .fingerprint = &fingerprint,
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync .protohandler = &protohandler
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync },
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync { EOH }
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync};
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncstatic int
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncmod_handler(module_t mod, int type, void *data)
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync{
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync int error;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync switch (type) {
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync case MOD_LOAD:
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync error = 0;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync LibAliasAttachHandlers(handlers);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync break;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync case MOD_UNLOAD:
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync error = 0;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync LibAliasDetachHandlers(handlers);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync break;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync default:
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync error = EINVAL;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync }
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync return (error);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync}
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#ifdef _KERNEL
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncstatic
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#endif
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncmoduledata_t alias_mod = {
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync "alias_dummy", mod_handler, NULL
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync};
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#ifdef _KERNEL
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncDECLARE_MODULE(alias_dummy, alias_mod, SI_SUB_DRIVERS, SI_ORDER_SECOND);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncMODULE_VERSION(alias_dummy, 1);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncMODULE_DEPEND(alias_dummy, libalias, 1, 1, 1);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#endif
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncstatic void
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncAliasHandleDummy(struct libalias *la, struct ip *ip, struct alias_data *ah)
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync{
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync ; /* Dummy. */
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync}
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync