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      1 /*	$NetBSD: npfext_normalize.c,v 1.2 2018/09/29 14:41:37 rmind Exp $	*/
      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: npfext_normalize.c,v 1.2 2018/09/29 14:41:37 rmind Exp $");
     31 
     32 #include <stdlib.h>
     33 #include <stdbool.h>
     34 #include <string.h>
     35 #include <assert.h>
     36 #include <errno.h>
     37 
     38 #include <npf.h>
     39 
     40 int		npfext_normalize_init(void);
     41 nl_ext_t *	npfext_normalize_construct(const char *);
     42 int		npfext_normalize_param(nl_ext_t *, const char *, const char *);
     43 
     44 int
     45 npfext_normalize_init(void)
     46 {
     47 	/* Nothing to initialize. */
     48 	return 0;
     49 }
     50 
     51 nl_ext_t *
     52 npfext_normalize_construct(const char *name)
     53 {
     54 	assert(strcmp(name, "normalize") == 0);
     55 	return npf_ext_construct(name);
     56 }
     57 
     58 int
     59 npfext_normalize_param(nl_ext_t *ext, const char *param, const char *val)
     60 {
     61 	enum ptype {
     62 		PARAM_BOOL,
     63 		PARAM_U32
     64 	};
     65 	static const struct param {
     66 		const char *	name;
     67 		enum ptype	type;
     68 		bool		reqval;
     69 	} params[] = {
     70 		{ "random-id",	PARAM_BOOL,	false	},
     71 		{ "no-df",	PARAM_BOOL,	false	},
     72 		{ "min-ttl",	PARAM_U32,	true	},
     73 		{ "max-mss",	PARAM_U32,	true	},
     74 	};
     75 
     76 	for (unsigned i = 0; i < __arraycount(params); i++) {
     77 		const char *name = params[i].name;
     78 
     79 		if (strcmp(name, param) != 0) {
     80 			continue;
     81 		}
     82 		if (val == NULL && params[i].reqval) {
     83 			return EINVAL;
     84 		}
     85 
     86 		switch (params[i].type) {
     87 		case PARAM_BOOL:
     88 			npf_ext_param_bool(ext, name, true);
     89 			break;
     90 		case PARAM_U32:
     91 			npf_ext_param_u32(ext, name, atol(val));
     92 			break;
     93 		default:
     94 			assert(false);
     95 		}
     96 		return 0;
     97 	}
     98 
     99 	/* Invalid parameter, if not found. */
    100 	return EINVAL;
    101 }
    102