Merge commit 'origin/trunk@12184' into fedora

[iptables.git] / trunk / extensions / libipt_ECN.c

diff --git a/trunk/extensions/libipt_ECN.c b/trunk/extensions/libipt_ECN.c
new file mode 100644 (file)
index 0000000..9526c37
--- /dev/null
+++ b/trunk/extensions/libipt_ECN.c
@@ -0,0 +1,172 @@
+/* Shared library add-on to iptables for ECN, $Version$
+ *
+ * (C) 2002 by Harald Welte <laforge@gnumonks.org>
+ *
+ * This program is distributed under the terms of GNU GPL v2, 1991
+ *
+ * libipt_ECN.c borrowed heavily from libipt_DSCP.c
+ *
+ * $Id$
+ */
+#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_ECN.h>
+
+static void ECN_help(void)
+{
+       printf(
+"ECN target options\n"
+"  --ecn-tcp-remove            Remove all ECN bits from TCP header\n");
+}
+
+#if 0
+"ECN target v%s EXPERIMENTAL options (use with extreme care!)\n"
+"  --ecn-ip-ect                        Set the IPv4 ECT codepoint (0 to 3)\n"
+"  --ecn-tcp-cwr               Set the IPv4 CWR bit (0 or 1)\n"
+"  --ecn-tcp-ece               Set the IPv4 ECE bit (0 or 1)\n",
+#endif
+
+
+static const struct option ECN_opts[] = {
+       { "ecn-tcp-remove", 0, NULL, 'F' },
+       { "ecn-tcp-cwr", 1, NULL, 'G' },
+       { "ecn-tcp-ece", 1, NULL, 'H' },
+       { "ecn-ip-ect", 1, NULL, '9' },
+       { .name = NULL }
+};
+
+static int ECN_parse(int c, char **argv, int invert, unsigned int *flags,
+                     const void *entry, struct xt_entry_target **target)
+{
+       unsigned int result;
+       struct ipt_ECN_info *einfo
+               = (struct ipt_ECN_info *)(*target)->data;
+
+       switch (c) {
+       case 'F':
+               if (*flags)
+                       exit_error(PARAMETER_PROBLEM,
+                               "ECN target: Only use --ecn-tcp-remove ONCE!");
+               einfo->operation = IPT_ECN_OP_SET_ECE | IPT_ECN_OP_SET_CWR;
+               einfo->proto.tcp.ece = 0;
+               einfo->proto.tcp.cwr = 0;
+               *flags = 1;
+               break;
+       case 'G':
+               if (*flags & IPT_ECN_OP_SET_CWR)
+                       exit_error(PARAMETER_PROBLEM,
+                               "ECN target: Only use --ecn-tcp-cwr ONCE!");
+               if (string_to_number(optarg, 0, 1, &result))
+                       exit_error(PARAMETER_PROBLEM,
+                                  "ECN target: Value out of range");
+               einfo->operation |= IPT_ECN_OP_SET_CWR;
+               einfo->proto.tcp.cwr = result;
+               *flags |= IPT_ECN_OP_SET_CWR;
+               break;
+       case 'H':
+               if (*flags & IPT_ECN_OP_SET_ECE)
+                       exit_error(PARAMETER_PROBLEM,
+                               "ECN target: Only use --ecn-tcp-ece ONCE!");
+               if (string_to_number(optarg, 0, 1, &result))
+                       exit_error(PARAMETER_PROBLEM,
+                                  "ECN target: Value out of range");
+               einfo->operation |= IPT_ECN_OP_SET_ECE;
+               einfo->proto.tcp.ece = result;
+               *flags |= IPT_ECN_OP_SET_ECE;
+               break;
+       case '9':
+               if (*flags & IPT_ECN_OP_SET_IP)
+                       exit_error(PARAMETER_PROBLEM,
+                               "ECN target: Only use --ecn-ip-ect ONCE!");
+               if (string_to_number(optarg, 0, 3, &result))
+                       exit_error(PARAMETER_PROBLEM,
+                                  "ECN target: Value out of range");
+               einfo->operation |= IPT_ECN_OP_SET_IP;
+               einfo->ip_ect = result;
+               *flags |= IPT_ECN_OP_SET_IP;
+               break;
+       default:
+               return 0;
+       }
+
+       return 1;
+}
+
+static void ECN_check(unsigned int flags)
+{
+       if (!flags)
+               exit_error(PARAMETER_PROBLEM,
+                          "ECN target: Parameter --ecn-tcp-remove is required");
+}
+
+/* Prints out the targinfo. */
+static void ECN_print(const void *ip, const struct xt_entry_target *target,
+                      int numeric)
+{
+       const struct ipt_ECN_info *einfo =
+               (const struct ipt_ECN_info *)target->data;
+
+       printf("ECN ");
+
+       if (einfo->operation == (IPT_ECN_OP_SET_ECE|IPT_ECN_OP_SET_CWR)
+           && einfo->proto.tcp.ece == 0
+           && einfo->proto.tcp.cwr == 0)
+               printf("TCP remove ");
+       else {
+               if (einfo->operation & IPT_ECN_OP_SET_ECE)
+                       printf("ECE=%u ", einfo->proto.tcp.ece);
+
+               if (einfo->operation & IPT_ECN_OP_SET_CWR)
+                       printf("CWR=%u ", einfo->proto.tcp.cwr);
+
+               if (einfo->operation & IPT_ECN_OP_SET_IP)
+                       printf("ECT codepoint=%u ", einfo->ip_ect);
+       }
+}
+
+/* Saves the union ipt_targinfo in parsable form to stdout. */
+static void ECN_save(const void *ip, const struct xt_entry_target *target)
+{
+       const struct ipt_ECN_info *einfo =
+               (const struct ipt_ECN_info *)target->data;
+
+       if (einfo->operation == (IPT_ECN_OP_SET_ECE|IPT_ECN_OP_SET_CWR)
+           && einfo->proto.tcp.ece == 0
+           && einfo->proto.tcp.cwr == 0)
+               printf("--ecn-tcp-remove ");
+       else {
+
+               if (einfo->operation & IPT_ECN_OP_SET_ECE)
+                       printf("--ecn-tcp-ece %d ", einfo->proto.tcp.ece);
+
+               if (einfo->operation & IPT_ECN_OP_SET_CWR)
+                       printf("--ecn-tcp-cwr %d ", einfo->proto.tcp.cwr);
+
+               if (einfo->operation & IPT_ECN_OP_SET_IP)
+                       printf("--ecn-ip-ect %d ", einfo->ip_ect);
+       }
+}
+
+static struct xtables_target ecn_tg_reg = {
+       .name           = "ECN",
+       .version        = XTABLES_VERSION,
+       .family         = PF_INET,
+       .size           = XT_ALIGN(sizeof(struct ipt_ECN_info)),
+       .userspacesize  = XT_ALIGN(sizeof(struct ipt_ECN_info)),
+       .help           = ECN_help,
+       .parse          = ECN_parse,
+       .final_check    = ECN_check,
+       .print          = ECN_print,
+       .save           = ECN_save,
+       .extra_opts     = ECN_opts,
+};
+
+void _init(void)
+{
+       xtables_register_target(&ecn_tg_reg);
+}