1 /* 802_3 2 * 3 * Author: 4 * Chris Vitale <csv (at) bluetail.com> 5 * 6 * May 2003 7 * 8 * Adapted by Arturo Borrero Gonzalez <arturo (at) debian.org> 9 * to use libxtables for ebtables-compat 10 */ 11 12 #include <stdbool.h> 13 #include <stdio.h> 14 #include <string.h> 15 #include <stdlib.h> 16 #include <getopt.h> 17 #include <xtables.h> 18 #include <linux/netfilter_bridge/ebt_802_3.h> 19 20 #define _802_3_SAP '1' 21 #define _802_3_TYPE '2' 22 23 static const struct option br802_3_opts[] = { 24 { .name = "802_3-sap", .has_arg = true, .val = _802_3_SAP }, 25 { .name = "802_3-type", .has_arg = true, .val = _802_3_TYPE }, 26 XT_GETOPT_TABLEEND, 27 }; 28 29 static void br802_3_print_help(void) 30 { 31 printf( 32 "802_3 options:\n" 33 "--802_3-sap [!] protocol : 802.3 DSAP/SSAP- 1 byte value (hex)\n" 34 " DSAP and SSAP are always the same. One SAP applies to both fields\n" 35 "--802_3-type [!] protocol : 802.3 SNAP Type- 2 byte value (hex)\n" 36 " Type implies SAP value 0xaa\n"); 37 } 38 39 static void br802_3_init(struct xt_entry_match *match) 40 { 41 struct ebt_802_3_info *info = (struct ebt_802_3_info *)match->data; 42 43 info->invflags = 0; 44 info->bitmask = 0; 45 } 46 47 static int 48 br802_3_parse(int c, char **argv, int invert, unsigned int *flags, 49 const void *entry, struct xt_entry_match **match) 50 { 51 struct ebt_802_3_info *info = (struct ebt_802_3_info *) (*match)->data; 52 unsigned int i; 53 char *end; 54 55 switch (c) { 56 case _802_3_SAP: 57 if (invert) 58 info->invflags |= EBT_802_3_SAP; 59 i = strtoul(optarg, &end, 16); 60 if (i > 255 || *end != '\0') 61 xtables_error(PARAMETER_PROBLEM, 62 "Problem with specified " 63 "sap hex value, %x",i); 64 info->sap = i; /* one byte, so no byte order worries */ 65 info->bitmask |= EBT_802_3_SAP; 66 break; 67 case _802_3_TYPE: 68 if (invert) 69 info->invflags |= EBT_802_3_TYPE; 70 i = strtoul(optarg, &end, 16); 71 if (i > 65535 || *end != '\0') { 72 xtables_error(PARAMETER_PROBLEM, 73 "Problem with the specified " 74 "type hex value, %x",i); 75 } 76 info->type = htons(i); 77 info->bitmask |= EBT_802_3_TYPE; 78 break; 79 default: 80 return 0; 81 } 82 83 *flags |= info->bitmask; 84 return 1; 85 } 86 87 static void 88 br802_3_final_check(unsigned int flags) 89 { 90 if (!flags) 91 xtables_error(PARAMETER_PROBLEM, 92 "You must specify proper arguments"); 93 } 94 95 static void br802_3_print(const void *ip, const struct xt_entry_match *match, 96 int numeric) 97 { 98 struct ebt_802_3_info *info = (struct ebt_802_3_info *)match->data; 99 100 if (info->bitmask & EBT_802_3_SAP) { 101 printf("--802_3-sap "); 102 if (info->invflags & EBT_802_3_SAP) 103 printf("! "); 104 printf("0x%.2x ", info->sap); 105 } 106 if (info->bitmask & EBT_802_3_TYPE) { 107 printf("--802_3-type "); 108 if (info->invflags & EBT_802_3_TYPE) 109 printf("! "); 110 printf("0x%.4x ", ntohs(info->type)); 111 } 112 } 113 114 static struct xtables_match br802_3_match = 115 { 116 .name = "802_3", 117 .revision = 0, 118 .version = XTABLES_VERSION, 119 .family = NFPROTO_BRIDGE, 120 .size = XT_ALIGN(sizeof(struct ebt_802_3_info)), 121 .userspacesize = XT_ALIGN(sizeof(struct ebt_802_3_info)), 122 .init = br802_3_init, 123 .help = br802_3_print_help, 124 .parse = br802_3_parse, 125 .final_check = br802_3_final_check, 126 .print = br802_3_print, 127 .extra_opts = br802_3_opts, 128 }; 129 130 void _init(void) 131 { 132 xtables_register_match(&br802_3_match); 133 } 134
