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authorMarc Boucher <marc@mbsi.ca>2000-03-20 06:03:29 +0000
committerMarc Boucher <marc@mbsi.ca>2000-03-20 06:03:29 +0000
commite6869a8f59d779ff4d5a0984c86d80db70784962 (patch)
treecbaf2a4e3f8249de3967b959a214c27ff5fdee2a /extensions/libipt_TOS.c
reorganized tree after kernel merge
Diffstat (limited to 'extensions/libipt_TOS.c')
-rw-r--r--extensions/libipt_TOS.c173
1 files changed, 173 insertions, 0 deletions
diff --git a/extensions/libipt_TOS.c b/extensions/libipt_TOS.c
new file mode 100644
index 00000000..4a8e91ba
--- /dev/null
+++ b/extensions/libipt_TOS.c
@@ -0,0 +1,173 @@
+/* Shared library add-on to iptables to add TOS target support. */
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+
+#include <iptables.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_TOS.h>
+
+struct tosinfo {
+ struct ipt_entry_target t;
+ struct ipt_tos_target_info tos;
+};
+
+/* TOS names and values. */
+struct TOS_value
+{
+ unsigned char TOS;
+ const char *name;
+} TOS_values[] = {
+ { IPTOS_LOWDELAY, "Minimize-Delay" },
+ { IPTOS_THROUGHPUT, "Maximize-Throughput" },
+ { IPTOS_RELIABILITY, "Maximize-Reliability" },
+ { IPTOS_MINCOST, "Minimize-Cost" },
+ { IPTOS_NORMALSVC, "Normal-Service" },
+};
+
+/* Function which prints out usage message. */
+static void
+help(void)
+{
+ unsigned int i;
+
+ printf(
+"TOS target v%s options:\n"
+" --set-tos value Set Type of Service field to one of the\n"
+" following numeric or descriptive values:\n",
+NETFILTER_VERSION);
+
+ for (i = 0; i < sizeof(TOS_values)/sizeof(struct TOS_value);i++)
+ printf(" %s %u (0x%02x)\n",
+ TOS_values[i].name,
+ TOS_values[i].TOS,
+ TOS_values[i].TOS);
+ fputc('\n', stdout);
+}
+
+static struct option opts[] = {
+ { "set-tos", 1, 0, '1' },
+ { 0 }
+};
+
+/* Initialize the target. */
+static void
+init(struct ipt_entry_target *t, unsigned int *nfcache)
+{
+}
+
+static void
+parse_tos(const unsigned char *s, struct ipt_tos_target_info *info)
+{
+ unsigned int i;
+ int tos = string_to_number(s, 0, 255);
+
+ if (tos != -1) {
+ if (tos == IPTOS_LOWDELAY
+ || tos == IPTOS_THROUGHPUT
+ || tos == IPTOS_RELIABILITY
+ || tos == IPTOS_MINCOST
+ || tos == IPTOS_NORMALSVC) {
+ info->tos = (u_int8_t )tos;
+ return;
+ }
+ } else {
+ for (i = 0; i<sizeof(TOS_values)/sizeof(struct TOS_value); i++)
+ if (strcasecmp(s,TOS_values[i].name) == 0) {
+ info->tos = TOS_values[i].TOS;
+ return;
+ }
+ }
+ exit_error(PARAMETER_PROBLEM, "Bad TOS value `%s'", s);
+}
+
+/* Function which parses command options; returns true if it
+ ate an option */
+static int
+parse(int c, char **argv, int invert, unsigned int *flags,
+ const struct ipt_entry *entry,
+ struct ipt_entry_target **target)
+{
+ struct ipt_tos_target_info *tosinfo
+ = (struct ipt_tos_target_info *)(*target)->data;
+
+ switch (c) {
+ case '1':
+ if (*flags)
+ exit_error(PARAMETER_PROBLEM,
+ "TOS target: Cant specify --set-tos twice");
+ parse_tos(optarg, tosinfo);
+ *flags = 1;
+ break;
+
+ default:
+ return 0;
+ }
+
+ return 1;
+}
+
+static void
+final_check(unsigned int flags)
+{
+ if (!flags)
+ exit_error(PARAMETER_PROBLEM,
+ "TOS target: Parameter --set-tos is required");
+}
+
+static void
+print_tos(u_int8_t tos, int numeric)
+{
+ unsigned int i;
+
+ if (!numeric) {
+ for (i = 0; i<sizeof(TOS_values)/sizeof(struct TOS_value); i++)
+ if (TOS_values[i].TOS == tos) {
+ printf("%s ", TOS_values[i].name);
+ return;
+ }
+ }
+ printf("0x%02x ", tos);
+}
+
+/* Prints out the targinfo. */
+static void
+print(const struct ipt_ip *ip,
+ const struct ipt_entry_target *target,
+ int numeric)
+{
+ const struct ipt_tos_target_info *tosinfo =
+ (const struct ipt_tos_target_info *)target->data;
+ printf("TOS set ");
+ print_tos(tosinfo->tos, numeric);
+}
+
+/* Saves the union ipt_targinfo in parsable form to stdout. */
+static void
+save(const struct ipt_ip *ip, const struct ipt_entry_target *target)
+{
+ const struct ipt_tos_target_info *tosinfo =
+ (const struct ipt_tos_target_info *)target->data;
+
+ printf("--set-tos 0x%02x ", tosinfo->tos);
+}
+
+struct iptables_target tos
+= { NULL,
+ "TOS",
+ NETFILTER_VERSION,
+ sizeof(struct ipt_tos_target_info),
+ &help,
+ &init,
+ &parse,
+ &final_check,
+ &print,
+ &save,
+ opts
+};
+
+void _init(void)
+{
+ register_target(&tos);
+}