diff options
Diffstat (limited to 'freebsd/netinet/libalias/alias_dummy.c')
| -rw-r--r-- | freebsd/netinet/libalias/alias_dummy.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/freebsd/netinet/libalias/alias_dummy.c b/freebsd/netinet/libalias/alias_dummy.c new file mode 100644 index 00000000..2df81551 --- /dev/null +++ b/freebsd/netinet/libalias/alias_dummy.c @@ -0,0 +1,155 @@ +#include <rtems/freebsd/machine/rtems-bsd-config.h> + +/*- + * Copyright (c) 2005 Paolo Pisati <piso@FreeBSD.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <rtems/freebsd/sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +/* + * Alias_dummy is just an empty skeleton used to demostrate how to write + * a module for libalias, that will run unalterated in userland or in + * kernel land. + */ + +#ifdef _KERNEL +#include <rtems/freebsd/sys/param.h> +#include <rtems/freebsd/sys/kernel.h> +#include <rtems/freebsd/sys/module.h> +#else +#include <rtems/freebsd/errno.h> +#include <rtems/freebsd/sys/types.h> +#include <rtems/freebsd/stdio.h> +#endif + +#include <rtems/freebsd/netinet/in_systm.h> +#include <rtems/freebsd/netinet/in.h> +#include <rtems/freebsd/netinet/ip.h> +#include <rtems/freebsd/netinet/udp.h> + +#ifdef _KERNEL +#include <rtems/freebsd/netinet/libalias/alias_local.h> +#include <rtems/freebsd/netinet/libalias/alias_mod.h> +#else +#include <rtems/freebsd/local/alias_local.h> +#include <rtems/freebsd/local/alias_mod.h> +#endif + +static void +AliasHandleDummy(struct libalias *la, struct ip *ip, struct alias_data *ah); + +static int +fingerprint(struct libalias *la, struct alias_data *ah) +{ + + /* + * Check here all the data that will be used later, if any field + * is empy/NULL, return a -1 value. + */ + if (ah->dport == NULL || ah->sport == NULL || ah->lnk == NULL || + ah->maxpktsize == 0) + return (-1); + /* + * Fingerprint the incoming packet, if it matches any conditions + * return an OK value. + */ + if (ntohs(*ah->dport) == 123 + || ntohs(*ah->sport) == 456) + return (0); /* I know how to handle it. */ + return (-1); /* I don't recognize this packet. */ +} + +/* + * Wrap in this general purpose function, the real function used to alias the + * packets. + */ + +static int +protohandler(struct libalias *la, struct ip *pip, struct alias_data *ah) +{ + + AliasHandleDummy(la, pip, ah); + return (0); +} + +/* + * NOTA BENE: the next variable MUST NOT be renamed in any case if you want + * your module to work in userland, cause it's used to find and use all + * the protocol handlers present in every module. + * So WATCH OUT, your module needs this variables and it needs it with + * ITS EXACT NAME: handlers. + */ + +struct proto_handler handlers [] = { + { + .pri = 666, + .dir = IN|OUT, + .proto = UDP|TCP, + .fingerprint = &fingerprint, + .protohandler = &protohandler + }, + { EOH } +}; + +static int +mod_handler(module_t mod, int type, void *data) +{ + int error; + + switch (type) { + case MOD_LOAD: + error = 0; + LibAliasAttachHandlers(handlers); + break; + case MOD_UNLOAD: + error = 0; + LibAliasDetachHandlers(handlers); + break; + default: + error = EINVAL; + } + return (error); +} + +#ifdef _KERNEL +static +#endif +moduledata_t alias_mod = { + "alias_dummy", mod_handler, NULL +}; + +#ifdef _KERNEL +DECLARE_MODULE(alias_dummy, alias_mod, SI_SUB_DRIVERS, SI_ORDER_SECOND); +MODULE_VERSION(alias_dummy, 1); +MODULE_DEPEND(alias_dummy, libalias, 1, 1, 1); +#endif + +static void +AliasHandleDummy(struct libalias *la, struct ip *ip, struct alias_data *ah) +{ + ; /* Dummy. */ +} + |