npfext_normalize.c revision 1.2 
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
40int		npfext_normalize_init(void);
41nl_ext_t *	npfext_normalize_construct(const char *);
42int		npfext_normalize_param(nl_ext_t *, const char *, const char *);
43
44int
45npfext_normalize_init(void)
46{
47	/* Nothing to initialize. */
48	return 0;
49}
50
51nl_ext_t *
52npfext_normalize_construct(const char *name)
53{
54	assert(strcmp(name, "normalize") == 0);
55	return npf_ext_construct(name);
56}
57
58int
59npfext_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