1 /* $NetBSD: npfext_normalize.c,v 1.1 2013/03/10 21:49:26 christos 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 1.1 2013/03/10 21:49:26 christos Exp $"); 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_normalize_init(void); 40 nl_ext_t * npfext_normalize_construct(const char *); 41 int npfext_normalize_param(nl_ext_t *, const char *, const char *); 42 43 int 44 npfext_normalize_init(void) 45 { 46 /* Nothing to initialize. */ 47 return 0; 48 } 49 50 nl_ext_t * 51 npfext_normalize_construct(const char *name) 52 { 53 assert(strcmp(name, "normalize") == 0); 54 return npf_ext_construct(name); 55 } 56 57 int 58 npfext_normalize_param(nl_ext_t *ext, const char *param, const char *val) 59 { 60 enum ptype { 61 PARAM_BOOL, 62 PARAM_U32 63 }; 64 static const struct param { 65 const char * name; 66 enum ptype type; 67 bool reqval; 68 } params[] = { 69 { "random-id", PARAM_BOOL, false }, 70 { "no-df", PARAM_BOOL, false }, 71 { "min-ttl", PARAM_U32, true }, 72 { "max-mss", PARAM_U32, true }, 73 }; 74 75 for (unsigned i = 0; i < __arraycount(params); i++) { 76 const char *name = params[i].name; 77 78 if (strcmp(name, param) != 0) { 79 continue; 80 } 81 if (val == NULL && params[i].reqval) { 82 return EINVAL; 83 } 84 85 switch (params[i].type) { 86 case PARAM_BOOL: 87 npf_ext_param_bool(ext, name, true); 88 break; 89 case PARAM_U32: 90 npf_ext_param_u32(ext, name, atol(val)); 91 break; 92 default: 93 assert(false); 94 } 95 return 0; 96 } 97 98 /* Invalid parameter, if not found. */ 99 return EINVAL; 100 } 101