1/* Shared library add-on to ip6tables for condition match */ 2#include <stdio.h> 3#include <stdlib.h> 4#include <string.h> 5#include <getopt.h> 6#include <ip6tables.h> 7 8#include<linux/netfilter_ipv6/ip6_tables.h> 9#include<linux/netfilter_ipv6/ip6t_condition.h> 10 11 12static void 13help(void) 14{ 15 printf("condition match v%s options:\n" 16 "--condition [!] filename " 17 "Match on boolean value stored in /proc file\n", 18 IPTABLES_VERSION); 19} 20 21 22static struct option opts[] = { 23 { .name = "condition", .has_arg = 1, .flag = 0, .val = 'X' }, 24 { .name = 0 } 25}; 26 27static int 28parse(int c, char **argv, int invert, unsigned int *flags, 29 const struct ip6t_entry *entry, unsigned int *nfcache, 30 struct ip6t_entry_match **match) 31{ 32 struct condition6_info *info = 33 (struct condition6_info *) (*match)->data; 34 35 if (c == 'X') { 36 if (*flags) 37 exit_error(PARAMETER_PROBLEM, 38 "Can't specify multiple conditions"); 39 40 check_inverse(optarg, &invert, &optind, 0); 41 42 if (strlen(argv[optind - 1]) < CONDITION6_NAME_LEN) 43 strcpy(info->name, argv[optind - 1]); 44 else 45 exit_error(PARAMETER_PROBLEM, 46 "File name too long"); 47 48 info->invert = invert; 49 *flags = 1; 50 return 1; 51 } 52 53 return 0; 54} 55 56 57static void 58final_check(unsigned int flags) 59{ 60 if (!flags) 61 exit_error(PARAMETER_PROBLEM, 62 "Condition match: must specify --condition"); 63} 64 65 66static void 67print(const struct ip6t_ip6 *ip, 68 const struct ip6t_entry_match *match, int numeric) 69{ 70 const struct condition6_info *info = 71 (const struct condition6_info *) match->data; 72 73 printf("condition %s%s ", (info->invert) ? "!" : "", info->name); 74} 75 76 77static void 78save(const struct ip6t_ip6 *ip, 79 const struct ip6t_entry_match *match) 80{ 81 const struct condition6_info *info = 82 (const struct condition6_info *) match->data; 83 84 printf("--condition %s\"%s\" ", (info->invert) ? "! " : "", info->name); 85} 86 87 88static struct ip6tables_match condition = { 89 .name = "condition", 90 .version = IPTABLES_VERSION, 91 .size = IP6T_ALIGN(sizeof(struct condition6_info)), 92 .userspacesize = IP6T_ALIGN(sizeof(struct condition6_info)), 93 .help = &help, 94 .parse = &parse, 95 .final_check = &final_check, 96 .print = &print, 97 .save = &save, 98 .extra_opts = opts 99}; 100 101 102void 103_init(void) 104{ 105 register_match6(&condition); 106} 107