/external/iptables/extensions/tos_values.c
C | 96 lines | 71 code | 16 blank | 9 comment | 16 complexity | 23d81aca07ed73c528a71bfe77f0c90c MD5 | raw file
Possible License(s): GPL-2.0
- #include <stdbool.h>
- #include <stdint.h>
- #include <stdio.h>
- #include <linux/ip.h>
- #ifndef IPTOS_NORMALSVC
- # define IPTOS_NORMALSVC 0
- #endif
- struct tos_value_mask {
- uint8_t value, mask;
- };
- static const struct tos_symbol_info {
- unsigned char value;
- const char *name;
- } tos_symbol_names[] = {
- {IPTOS_LOWDELAY, "Minimize-Delay"},
- {IPTOS_THROUGHPUT, "Maximize-Throughput"},
- {IPTOS_RELIABILITY, "Maximize-Reliability"},
- {IPTOS_MINCOST, "Minimize-Cost"},
- {IPTOS_NORMALSVC, "Normal-Service"},
- {},
- };
- /*
- * tos_parse_numeric - parse sth. like "15/255"
- *
- * @s: input string
- * @info: accompanying structure
- * @bits: number of bits that are allowed
- * (8 for IPv4 TOS field, 4 for IPv6 Priority Field)
- */
- static bool tos_parse_numeric(const char *str, struct tos_value_mask *tvm,
- unsigned int bits)
- {
- const unsigned int max = (1 << bits) - 1;
- unsigned int value;
- char *end;
- xtables_strtoui(str, &end, &value, 0, max);
- tvm->value = value;
- tvm->mask = max;
- if (*end == '/') {
- const char *p = end + 1;
- if (!xtables_strtoui(p, &end, &value, 0, max))
- xtables_error(PARAMETER_PROBLEM, "Illegal value: \"%s\"",
- str);
- tvm->mask = value;
- }
- if (*end != '\0')
- xtables_error(PARAMETER_PROBLEM, "Illegal value: \"%s\"", str);
- return true;
- }
- static bool tos_parse_symbolic(const char *str, struct tos_value_mask *tvm,
- unsigned int def_mask)
- {
- const unsigned int max = UINT8_MAX;
- const struct tos_symbol_info *symbol;
- char *tmp;
- if (xtables_strtoui(str, &tmp, NULL, 0, max))
- return tos_parse_numeric(str, tvm, max);
- /* Do not consider ECN bits */
- tvm->mask = def_mask;
- for (symbol = tos_symbol_names; symbol->name != NULL; ++symbol)
- if (strcasecmp(str, symbol->name) == 0) {
- tvm->value = symbol->value;
- return true;
- }
- xtables_error(PARAMETER_PROBLEM, "Symbolic name \"%s\" is unknown", str);
- return false;
- }
- static bool tos_try_print_symbolic(const char *prefix,
- u_int8_t value, u_int8_t mask)
- {
- const struct tos_symbol_info *symbol;
- if (mask != 0x3F)
- return false;
- for (symbol = tos_symbol_names; symbol->name != NULL; ++symbol)
- if (value == symbol->value) {
- printf("%s%s ", prefix, symbol->name);
- return true;
- }
- return false;
- }