333cdb0c5a
with a percentage or modulo operation). This is a demo module, although it can
be used for packet loss simulation. Example of a procedure in npf.conf:
procedure "somedrop" {
# Drop 1.9% of the traffic
rndblock: percentage 1.9
}
98 lines
2.9 KiB
C
98 lines
2.9 KiB
C
/* $NetBSD: npfext_rndblock.c,v 1.1 2012/12/10 00:32:24 rmind Exp $ */
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/*-
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* Copyright (c) 2012 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: npfext_rndblock.c,v 1.1 2012/12/10 00:32:24 rmind Exp $");
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <errno.h>
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#include <npf.h>
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int npfext_rndblock_init(void);
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nl_ext_t * npfext_rndblock_construct(const char *);
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int npfext_rndblock_param(nl_ext_t *, const char *, const char *);
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int
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npfext_rndblock_init(void)
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{
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/* Nothing to initialise. */
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return 0;
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}
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nl_ext_t *
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npfext_rndblock_construct(const char *name)
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{
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assert(strcmp(name, "rndblock") == 0);
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return npf_ext_construct(name);
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}
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int
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npfext_rndblock_param(nl_ext_t *ext, const char *param, const char *val)
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{
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enum ptype { PARAM_U32 };
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static const struct param {
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const char * name;
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enum ptype type;
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signed long min;
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signed long max;
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} params[] = {
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{ "mod", PARAM_U32, 1, LONG_MAX },
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{ "percentage", PARAM_U32, 1, 9999 },
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};
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if (val == NULL) {
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return EINVAL;
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}
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for (unsigned i = 0; i < __arraycount(params); i++) {
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const char *name = params[i].name;
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long ival;
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if (strcmp(name, param) != 0) {
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continue;
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}
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/*
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* Note: multiply by 100 and convert floating point to
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* an integer, as 100% is based on 10000 in the kernel.
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*/
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ival = (i == 1) ? atof(val) * 100 : atol(val);
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if (ival < params[i].min || ival > params[i].max) {
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return EINVAL;
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}
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assert(params[i].type == PARAM_U32);
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npf_ext_param_u32(ext, name, ival);
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return 0;
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}
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/* Invalid parameter, if not found. */
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return EINVAL;
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}
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