Patrick McHardy | e342bf7 | 2006-12-03 18:56:50 +0000 | [diff] [blame] | 1 | #include <stdlib.h> |
| 2 | #include <stdio.h> |
| 3 | #include <string.h> |
| 4 | #include <getopt.h> |
| 5 | #include <ip6tables.h> |
| 6 | |
| 7 | #include <linux/netfilter_ipv6/ip6_tables.h> |
| 8 | #include <linux/netfilter/xt_NFLOG.h> |
| 9 | |
| 10 | enum { |
| 11 | NFLOG_GROUP = 0x1, |
| 12 | NFLOG_PREFIX = 0x2, |
| 13 | NFLOG_RANGE = 0x4, |
| 14 | NFLOG_THRESHOLD = 0x8, |
| 15 | }; |
| 16 | |
| 17 | static struct option opts[] = { |
| 18 | { "nflog-group", 1, 0, NFLOG_GROUP }, |
| 19 | { "nflog-prefix", 1, 0, NFLOG_PREFIX }, |
| 20 | { "nflog-range", 1, 0, NFLOG_RANGE }, |
| 21 | { "nflog-threshold", 1, 0, NFLOG_THRESHOLD }, |
| 22 | }; |
| 23 | |
| 24 | static void help(void) |
| 25 | { |
| 26 | printf("NFLOG v%s options:\n" |
| 27 | " --nflog-group NUM NETLINK group used for logging\n" |
| 28 | " --nflog-range NUM Number of byte to copy\n" |
| 29 | " --nflog-threshold NUM Message threshold of in-kernel queue\n" |
| 30 | " --nflog-prefix STRING Prefix string for log messages\n\n", |
| 31 | IPTABLES_VERSION); |
| 32 | } |
| 33 | |
| 34 | static void init(struct ip6t_entry_target *t, unsigned int *nfcache) |
| 35 | { |
| 36 | struct xt_nflog_info *info = (struct xt_nflog_info *)t->data; |
| 37 | |
Patrick McHardy | 191e3ff | 2007-03-06 02:00:32 +0000 | [diff] [blame] | 38 | info->group = 0; |
Patrick McHardy | e342bf7 | 2006-12-03 18:56:50 +0000 | [diff] [blame] | 39 | info->threshold = XT_NFLOG_DEFAULT_THRESHOLD; |
| 40 | } |
| 41 | |
| 42 | static int parse(int c, char **argv, int invert, unsigned int *flags, |
| 43 | const struct ip6t_entry *entry, |
| 44 | struct xt_entry_target **target) |
| 45 | { |
| 46 | struct xt_nflog_info *info = (struct xt_nflog_info *)(*target)->data; |
| 47 | int n; |
| 48 | |
| 49 | switch (c) { |
| 50 | case NFLOG_GROUP: |
| 51 | if (*flags & NFLOG_GROUP) |
| 52 | exit_error(PARAMETER_PROBLEM, |
| 53 | "Can't specify --nflog-group twice"); |
| 54 | if (check_inverse(optarg, &invert, NULL, 0)) |
| 55 | exit_error(PARAMETER_PROBLEM, |
| 56 | "Unexpected `!' after --nflog-group"); |
| 57 | |
| 58 | n = atoi(optarg); |
Patrick McHardy | 191e3ff | 2007-03-06 02:00:32 +0000 | [diff] [blame] | 59 | if (n < 0) |
Patrick McHardy | e342bf7 | 2006-12-03 18:56:50 +0000 | [diff] [blame] | 60 | exit_error(PARAMETER_PROBLEM, |
Patrick McHardy | 191e3ff | 2007-03-06 02:00:32 +0000 | [diff] [blame] | 61 | "--nflog-group can not be negative"); |
| 62 | info->group = n; |
Patrick McHardy | e342bf7 | 2006-12-03 18:56:50 +0000 | [diff] [blame] | 63 | break; |
| 64 | case NFLOG_PREFIX: |
| 65 | if (*flags & NFLOG_PREFIX) |
| 66 | exit_error(PARAMETER_PROBLEM, |
| 67 | "Can't specify --nflog-prefix twice"); |
| 68 | if (check_inverse(optarg, &invert, NULL, 0)) |
| 69 | exit_error(PARAMETER_PROBLEM, |
| 70 | "Unexpected `!' after --nflog-prefix"); |
| 71 | |
| 72 | n = strlen(optarg); |
| 73 | if (n == 0) |
| 74 | exit_error(PARAMETER_PROBLEM, |
| 75 | "No prefix specified for --nflog-prefix"); |
| 76 | if (n >= sizeof(info->prefix)) |
| 77 | exit_error(PARAMETER_PROBLEM, |
| 78 | "--nflog-prefix too long, max %Zu characters", |
| 79 | sizeof(info->prefix) - 1); |
| 80 | if (n != strlen(strtok(optarg, "\n"))) |
| 81 | exit_error(PARAMETER_PROBLEM, |
| 82 | "Newlines are not allowed in --nflog-prefix"); |
| 83 | strcpy(info->prefix, optarg); |
| 84 | break; |
| 85 | case NFLOG_RANGE: |
| 86 | if (*flags & NFLOG_RANGE) |
| 87 | exit_error(PARAMETER_PROBLEM, |
| 88 | "Can't specify --nflog-range twice"); |
| 89 | n = atoi(optarg); |
| 90 | if (n < 0) |
| 91 | exit_error(PARAMETER_PROBLEM, |
| 92 | "Invalid --nflog-range, must be >= 0"); |
| 93 | info->len = n; |
| 94 | break; |
| 95 | case NFLOG_THRESHOLD: |
| 96 | if (*flags & NFLOG_THRESHOLD) |
| 97 | exit_error(PARAMETER_PROBLEM, |
| 98 | "Can't specify --nflog-threshold twice"); |
| 99 | n = atoi(optarg); |
| 100 | if (n < 1) |
| 101 | exit_error(PARAMETER_PROBLEM, |
| 102 | "Invalid --nflog-threshold, must be >= 1"); |
| 103 | info->threshold = n; |
| 104 | break; |
| 105 | default: |
| 106 | return 0; |
| 107 | } |
| 108 | *flags |= c; |
| 109 | return 1; |
| 110 | } |
| 111 | |
| 112 | static void final_check(unsigned int flags) |
| 113 | { |
| 114 | return; |
| 115 | } |
| 116 | |
| 117 | static void nflog_print(const struct xt_nflog_info *info, char *prefix) |
| 118 | { |
| 119 | if (info->prefix[0] != '\0') |
| 120 | printf("%snflog-prefix \"%s\" ", prefix, info->prefix); |
Patrick McHardy | 191e3ff | 2007-03-06 02:00:32 +0000 | [diff] [blame] | 121 | if (info->group) |
| 122 | printf("%snflog-group %u ", prefix, info->group); |
Patrick McHardy | e342bf7 | 2006-12-03 18:56:50 +0000 | [diff] [blame] | 123 | if (info->len) |
| 124 | printf("%snflog-range %u ", prefix, info->len); |
| 125 | if (info->threshold != XT_NFLOG_DEFAULT_THRESHOLD) |
| 126 | printf("%snflog-threshold %u ", prefix, info->threshold); |
| 127 | } |
| 128 | |
| 129 | static void print(const struct ip6t_ip6 *ip, const struct xt_entry_target *target, |
| 130 | int numeric) |
| 131 | { |
| 132 | const struct xt_nflog_info *info = (struct xt_nflog_info *)target->data; |
| 133 | |
| 134 | nflog_print(info, ""); |
| 135 | } |
| 136 | |
| 137 | static void save(const struct ip6t_ip6 *ip, const struct xt_entry_target *target) |
| 138 | { |
| 139 | const struct xt_nflog_info *info = (struct xt_nflog_info *)target->data; |
| 140 | |
| 141 | nflog_print(info, "--"); |
| 142 | } |
| 143 | |
| 144 | static struct ip6tables_target nflog = { |
| 145 | .name = "NFLOG", |
| 146 | .version = IPTABLES_VERSION, |
| 147 | .size = XT_ALIGN(sizeof(struct xt_nflog_info)), |
| 148 | .userspacesize = XT_ALIGN(sizeof(struct xt_nflog_info)), |
| 149 | .help = help, |
| 150 | .init = init, |
| 151 | .parse = parse, |
| 152 | .final_check = final_check, |
| 153 | .print = print, |
| 154 | .save = save, |
| 155 | .extra_opts = opts, |
| 156 | }; |
| 157 | |
| 158 | void _init(void) |
| 159 | { |
| 160 | register_target6(&nflog); |
| 161 | } |