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