libxt_tos
Move libipt_tos revision 0 to libxt_tos revision 0 and add support
for xt_tos match revision 1.
Signed-off-by: Jan Engelhardt <jengelh@computergmbh.de>
diff --git a/extensions/tos_values.c b/extensions/tos_values.c
new file mode 100644
index 0000000..014b65b
--- /dev/null
+++ b/extensions/tos_values.c
@@ -0,0 +1,90 @@
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+
+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;
+
+ strtonum(str, &end, &value, 0, max);
+ tvm->value = value;
+ tvm->mask = max;
+
+ if (*end == '/') {
+ const char *p = end + 1;
+
+ if (!strtonum(p, &end, &value, 0, max))
+ exit_error(PARAMETER_PROBLEM, "Illegal value: \"%s\"",
+ str);
+ tvm->mask = value;
+ }
+
+ if (*end != '\0')
+ exit_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 = 255;
+ const struct tos_symbol_info *symbol;
+
+ if (strtonum(str, NULL, 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;
+ }
+
+ exit_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;
+}