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      1 /*	$NetBSD$	*/
      2 
      3 /*-
      4  * Copyright (c) 2012 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __RCSID("$NetBSD$");
     31 
     32 #include <stdlib.h>
     33 #include <string.h>
     34 #include <assert.h>
     35 #include <errno.h>
     36 
     37 #include <npf.h>
     38 
     39 int		npfext_rndblock_init(void);
     40 nl_ext_t *	npfext_rndblock_construct(const char *);
     41 int		npfext_rndblock_param(nl_ext_t *, const char *, const char *);
     42 
     43 int
     44 npfext_rndblock_init(void)
     45 {
     46 	/* Nothing to initialise. */
     47 	return 0;
     48 }
     49 
     50 nl_ext_t *
     51 npfext_rndblock_construct(const char *name)
     52 {
     53 	assert(strcmp(name, "rndblock") == 0);
     54 	return npf_ext_construct(name);
     55 }
     56 
     57 int
     58 npfext_rndblock_param(nl_ext_t *ext, const char *param, const char *val)
     59 {
     60 	enum ptype { PARAM_U32 };
     61 	static const struct param {
     62 		const char *	name;
     63 		enum ptype	type;
     64 		signed long	min;
     65 		signed long	max;
     66 	} params[] = {
     67 		{ "mod",	PARAM_U32,	1,	LONG_MAX	},
     68 		{ "percentage",	PARAM_U32,	1,	9999		},
     69 	};
     70 
     71 	if (val == NULL) {
     72 		return EINVAL;
     73 	}
     74 	for (unsigned i = 0; i < __arraycount(params); i++) {
     75 		const char *name = params[i].name;
     76 		long ival;
     77 
     78 		if (strcmp(name, param) != 0) {
     79 			continue;
     80 		}
     81 
     82 		/*
     83 		 * Note: multiply by 100 and convert floating point to
     84 		 * an integer, as 100% is based on 10000 in the kernel.
     85 		 */
     86 		ival = (i == 1) ? atof(val) * 100 : atol(val);
     87 		if (ival < params[i].min || ival > params[i].max) {
     88 			return EINVAL;
     89 		}
     90 		assert(params[i].type == PARAM_U32);
     91 		npf_ext_param_u32(ext, name, ival);
     92 		return 0;
     93 	}
     94 
     95 	/* Invalid parameter, if not found. */
     96 	return EINVAL;
     97 }
     98