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
npfext_normalize_init(void)45 npfext_normalize_init(void)
46 {
47 /* Nothing to initialize. */
48 return 0;
49 }
50
51 nl_ext_t *
npfext_normalize_construct(const char * name)52 npfext_normalize_construct(const char *name)
53 {
54 assert(strcmp(name, "normalize") == 0);
55 return npf_ext_construct(name);
56 }
57
58 int
npfext_normalize_param(nl_ext_t * ext,const char * param,const char * val)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