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#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"},
{ .name = NULL }
};
/*
* 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;
}
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