Patrick McHardy | 2528258 | 2008-01-15 17:25:39 +0000 | [diff] [blame] | 1 | #include <stdio.h> |
| 2 | #include <string.h> |
| 3 | #include <stdlib.h> |
| 4 | #include <stddef.h> |
| 5 | #include <getopt.h> |
| 6 | #include <math.h> |
| 7 | |
| 8 | #include <xtables.h> |
| 9 | #include <linux/netfilter/x_tables.h> |
| 10 | #include <linux/netfilter/xt_RATEEST.h> |
| 11 | |
| 12 | /* hack to pass raw values to final_check */ |
| 13 | static struct xt_rateest_target_info *RATEEST_info; |
| 14 | static unsigned int interval; |
| 15 | static unsigned int ewma_log; |
| 16 | |
| 17 | static void |
| 18 | RATEEST_help(void) |
| 19 | { |
| 20 | printf( |
Jan Engelhardt | bce1c21 | 2008-03-27 05:48:14 +0100 | [diff] [blame] | 21 | "RATEEST target options:\n" |
Patrick McHardy | 2528258 | 2008-01-15 17:25:39 +0000 | [diff] [blame] | 22 | " --rateest-name name Rate estimator name\n" |
| 23 | " --rateest-interval sec Rate measurement interval in seconds\n" |
Jan Engelhardt | 8b7c64d | 2008-04-15 11:48:25 +0200 | [diff] [blame] | 24 | " --rateest-ewmalog value Rate measurement averaging time constant\n"); |
Patrick McHardy | 2528258 | 2008-01-15 17:25:39 +0000 | [diff] [blame] | 25 | } |
| 26 | |
| 27 | enum RATEEST_options { |
| 28 | RATEEST_OPT_NAME, |
| 29 | RATEEST_OPT_INTERVAL, |
| 30 | RATEEST_OPT_EWMALOG, |
| 31 | }; |
| 32 | |
| 33 | static const struct option RATEEST_opts[] = { |
| 34 | { "rateest-name", 1, NULL, RATEEST_OPT_NAME }, |
| 35 | { "rateest-interval", 1, NULL, RATEEST_OPT_INTERVAL }, |
| 36 | { "rateest-ewmalog", 1, NULL, RATEEST_OPT_EWMALOG }, |
Max Kellermann | 9ee386a | 2008-01-29 13:48:05 +0000 | [diff] [blame] | 37 | { .name = NULL }, |
Patrick McHardy | 2528258 | 2008-01-15 17:25:39 +0000 | [diff] [blame] | 38 | }; |
| 39 | |
| 40 | /* Copied from iproute */ |
| 41 | #define TIME_UNITS_PER_SEC 1000000 |
| 42 | |
| 43 | static int |
| 44 | RATEEST_get_time(unsigned int *time, const char *str) |
| 45 | { |
| 46 | double t; |
| 47 | char *p; |
| 48 | |
| 49 | t = strtod(str, &p); |
| 50 | if (p == str) |
| 51 | return -1; |
| 52 | |
| 53 | if (*p) { |
| 54 | if (strcasecmp(p, "s") == 0 || strcasecmp(p, "sec")==0 || |
| 55 | strcasecmp(p, "secs")==0) |
| 56 | t *= TIME_UNITS_PER_SEC; |
| 57 | else if (strcasecmp(p, "ms") == 0 || strcasecmp(p, "msec")==0 || |
| 58 | strcasecmp(p, "msecs") == 0) |
| 59 | t *= TIME_UNITS_PER_SEC/1000; |
| 60 | else if (strcasecmp(p, "us") == 0 || strcasecmp(p, "usec")==0 || |
| 61 | strcasecmp(p, "usecs") == 0) |
| 62 | t *= TIME_UNITS_PER_SEC/1000000; |
| 63 | else |
| 64 | return -1; |
| 65 | } |
| 66 | |
| 67 | *time = t; |
| 68 | return 0; |
| 69 | } |
| 70 | |
| 71 | static void |
| 72 | RATEEST_print_time(unsigned int time) |
| 73 | { |
| 74 | double tmp = time; |
| 75 | |
| 76 | if (tmp >= TIME_UNITS_PER_SEC) |
| 77 | printf("%.1fs ", tmp/TIME_UNITS_PER_SEC); |
| 78 | else if (tmp >= TIME_UNITS_PER_SEC/1000) |
| 79 | printf("%.1fms ", tmp/(TIME_UNITS_PER_SEC/1000)); |
| 80 | else |
| 81 | printf("%uus ", time); |
| 82 | } |
| 83 | |
| 84 | static void |
| 85 | RATEEST_init(struct xt_entry_target *target) |
| 86 | { |
| 87 | interval = 0; |
| 88 | ewma_log = 0; |
| 89 | } |
| 90 | |
| 91 | static int |
| 92 | RATEEST_parse(int c, char **argv, int invert, unsigned int *flags, |
| 93 | const void *entry, struct xt_entry_target **target) |
| 94 | { |
| 95 | struct xt_rateest_target_info *info = (void *)(*target)->data; |
| 96 | |
| 97 | RATEEST_info = info; |
| 98 | |
| 99 | switch (c) { |
| 100 | case RATEEST_OPT_NAME: |
| 101 | if (*flags & (1 << c)) |
| 102 | exit_error(PARAMETER_PROBLEM, |
| 103 | "RATEEST: can't specify --rateest-name twice"); |
| 104 | *flags |= 1 << c; |
| 105 | |
| 106 | strncpy(info->name, optarg, sizeof(info->name) - 1); |
| 107 | break; |
| 108 | |
| 109 | case RATEEST_OPT_INTERVAL: |
| 110 | if (*flags & (1 << c)) |
| 111 | exit_error(PARAMETER_PROBLEM, |
| 112 | "RATEEST: can't specify --rateest-interval twice"); |
| 113 | *flags |= 1 << c; |
| 114 | |
| 115 | if (RATEEST_get_time(&interval, optarg) < 0) |
| 116 | exit_error(PARAMETER_PROBLEM, |
| 117 | "RATEEST: bad interval value `%s'", optarg); |
| 118 | |
| 119 | break; |
| 120 | |
| 121 | case RATEEST_OPT_EWMALOG: |
| 122 | if (*flags & (1 << c)) |
| 123 | exit_error(PARAMETER_PROBLEM, |
| 124 | "RATEEST: can't specify --rateest-ewmalog twice"); |
| 125 | *flags |= 1 << c; |
| 126 | |
| 127 | if (RATEEST_get_time(&ewma_log, optarg) < 0) |
| 128 | exit_error(PARAMETER_PROBLEM, |
| 129 | "RATEEST: bad ewmalog value `%s'", optarg); |
| 130 | |
| 131 | break; |
| 132 | |
| 133 | default: |
| 134 | return 0; |
| 135 | } |
| 136 | |
| 137 | return 1; |
| 138 | } |
| 139 | |
| 140 | static void |
| 141 | RATEEST_final_check(unsigned int flags) |
| 142 | { |
| 143 | struct xt_rateest_target_info *info = RATEEST_info; |
| 144 | |
| 145 | if (!(flags & (1 << RATEEST_OPT_NAME))) |
| 146 | exit_error(PARAMETER_PROBLEM, "RATEEST: no name specified"); |
| 147 | if (!(flags & (1 << RATEEST_OPT_INTERVAL))) |
| 148 | exit_error(PARAMETER_PROBLEM, "RATEEST: no interval specified"); |
| 149 | if (!(flags & (1 << RATEEST_OPT_EWMALOG))) |
| 150 | exit_error(PARAMETER_PROBLEM, "RATEEST: no ewmalog specified"); |
| 151 | |
| 152 | for (info->interval = 0; info->interval <= 5; info->interval++) { |
| 153 | if (interval <= (1 << info->interval) * (TIME_UNITS_PER_SEC / 4)) |
| 154 | break; |
| 155 | } |
| 156 | |
| 157 | if (info->interval > 5) |
| 158 | exit_error(PARAMETER_PROBLEM, |
| 159 | "RATEEST: interval value is too large"); |
| 160 | info->interval -= 2; |
| 161 | |
| 162 | for (info->ewma_log = 1; info->ewma_log < 32; info->ewma_log++) { |
| 163 | double w = 1.0 - 1.0 / (1 << info->ewma_log); |
| 164 | if (interval / (-log(w)) > ewma_log) |
| 165 | break; |
| 166 | } |
| 167 | info->ewma_log--; |
| 168 | |
| 169 | if (info->ewma_log == 0 || info->ewma_log >= 31) |
| 170 | exit_error(PARAMETER_PROBLEM, |
| 171 | "RATEEST: ewmalog value is out of range"); |
| 172 | } |
| 173 | |
| 174 | static void |
| 175 | __RATEEST_print(const struct xt_entry_target *target, const char *prefix) |
| 176 | { |
| 177 | struct xt_rateest_target_info *info = (void *)target->data; |
Jan Engelhardt | dbb7754 | 2008-02-11 00:33:30 +0100 | [diff] [blame] | 178 | unsigned int local_interval; |
| 179 | unsigned int local_ewma_log; |
Patrick McHardy | 2528258 | 2008-01-15 17:25:39 +0000 | [diff] [blame] | 180 | |
Jan Engelhardt | dbb7754 | 2008-02-11 00:33:30 +0100 | [diff] [blame] | 181 | local_interval = (TIME_UNITS_PER_SEC << (info->interval + 2)) / 4; |
| 182 | local_ewma_log = local_interval * (1 << (info->ewma_log)); |
Patrick McHardy | 2528258 | 2008-01-15 17:25:39 +0000 | [diff] [blame] | 183 | |
| 184 | printf("%sname %s ", prefix, info->name); |
| 185 | printf("%sinterval ", prefix); |
Jan Engelhardt | dbb7754 | 2008-02-11 00:33:30 +0100 | [diff] [blame] | 186 | RATEEST_print_time(local_interval); |
Patrick McHardy | 2528258 | 2008-01-15 17:25:39 +0000 | [diff] [blame] | 187 | printf("%sewmalog ", prefix); |
Jan Engelhardt | dbb7754 | 2008-02-11 00:33:30 +0100 | [diff] [blame] | 188 | RATEEST_print_time(local_ewma_log); |
Patrick McHardy | 2528258 | 2008-01-15 17:25:39 +0000 | [diff] [blame] | 189 | } |
| 190 | |
| 191 | static void |
| 192 | RATEEST_print(const void *ip, const struct xt_entry_target *target, |
| 193 | int numeric) |
| 194 | { |
| 195 | __RATEEST_print(target, ""); |
| 196 | } |
| 197 | |
| 198 | static void |
| 199 | RATEEST_save(const void *ip, const struct xt_entry_target *target) |
| 200 | { |
| 201 | __RATEEST_print(target, "--rateest-"); |
| 202 | } |
| 203 | |
Jan Engelhardt | 23545c2 | 2008-02-14 04:23:04 +0100 | [diff] [blame] | 204 | static struct xtables_target rateest_tg_reg = { |
| 205 | .family = AF_UNSPEC, |
Patrick McHardy | 2528258 | 2008-01-15 17:25:39 +0000 | [diff] [blame] | 206 | .name = "RATEEST", |
Jan Engelhardt | 8b7c64d | 2008-04-15 11:48:25 +0200 | [diff] [blame] | 207 | .version = XTABLES_VERSION, |
Patrick McHardy | 2528258 | 2008-01-15 17:25:39 +0000 | [diff] [blame] | 208 | .size = XT_ALIGN(sizeof(struct xt_rateest_target_info)), |
| 209 | .userspacesize = XT_ALIGN(sizeof(struct xt_rateest_target_info)), |
| 210 | .help = RATEEST_help, |
| 211 | .init = RATEEST_init, |
| 212 | .parse = RATEEST_parse, |
| 213 | .final_check = RATEEST_final_check, |
| 214 | .print = RATEEST_print, |
| 215 | .save = RATEEST_save, |
| 216 | .extra_opts = RATEEST_opts, |
| 217 | }; |
| 218 | |
| 219 | void _init(void) |
| 220 | { |
Jan Engelhardt | 23545c2 | 2008-02-14 04:23:04 +0100 | [diff] [blame] | 221 | xtables_register_target(&rateest_tg_reg); |
Patrick McHardy | 2528258 | 2008-01-15 17:25:39 +0000 | [diff] [blame] | 222 | } |