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..0621453
--- /dev/null
+++ b/trunk/extensions/libipt_ecn.c
@@ -0,0 +1,163 @@
+/* Shared library add-on to iptables for ECN matching
+ *
+ * (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
+ *
+ */
+#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 match options\n"
+"[!] --ecn-tcp-cwr             Match CWR bit of TCP header\n"
+"[!] --ecn-tcp-ece             Match ECE bit of TCP header\n"
+"[!] --ecn-ip-ect [0..3]       Match ECN codepoint in IPv4 header\n");
+}
+
+static const struct option ecn_opts[] = {
+       { .name = "ecn-tcp-cwr", .has_arg = 0, .val = 'F' },
+       { .name = "ecn-tcp-ece", .has_arg = 0, .val = 'G' },
+       { .name = "ecn-ip-ect",  .has_arg = 1, .val = 'H' },
+       { .name = NULL }
+};
+
+static int ecn_parse(int c, char **argv, int invert, unsigned int *flags,
+                     const void *entry, struct xt_entry_match **match)
+{
+       unsigned int result;
+       struct ipt_ecn_info *einfo
+               = (struct ipt_ecn_info *)(*match)->data;
+
+       switch (c) {
+       case 'F':
+               if (*flags & IPT_ECN_OP_MATCH_CWR)
+                       exit_error(PARAMETER_PROBLEM,
+                                  "ECN match: can only use parameter ONCE!");
+               check_inverse(optarg, &invert, &optind, 0);
+               einfo->operation |= IPT_ECN_OP_MATCH_CWR;
+               if (invert)
+                       einfo->invert |= IPT_ECN_OP_MATCH_CWR;
+               *flags |= IPT_ECN_OP_MATCH_CWR;
+               break;
+
+       case 'G':
+               if (*flags & IPT_ECN_OP_MATCH_ECE)
+                       exit_error(PARAMETER_PROBLEM,
+                                  "ECN match: can only use parameter ONCE!");
+               check_inverse(optarg, &invert, &optind, 0);
+               einfo->operation |= IPT_ECN_OP_MATCH_ECE;
+               if (invert)
+                       einfo->invert |= IPT_ECN_OP_MATCH_ECE;
+               *flags |= IPT_ECN_OP_MATCH_ECE;
+               break;
+
+       case 'H':
+               if (*flags & IPT_ECN_OP_MATCH_IP)
+                       exit_error(PARAMETER_PROBLEM,
+                                  "ECN match: can only use parameter ONCE!");
+               check_inverse(optarg, &invert, &optind, 0);
+               if (invert)
+                       einfo->invert |= IPT_ECN_OP_MATCH_IP;
+               *flags |= IPT_ECN_OP_MATCH_IP;
+               einfo->operation |= IPT_ECN_OP_MATCH_IP;
+               if (string_to_number(optarg, 0, 3, &result))
+                       exit_error(PARAMETER_PROBLEM,
+                                  "ECN match: Value out of range");
+               einfo->ip_ect = result;
+               break;
+       default:
+               return 0;
+       }
+
+       return 1;
+}
+
+static void ecn_check(unsigned int flags)
+{
+       if (!flags)
+               exit_error(PARAMETER_PROBLEM,
+                          "ECN match: some option required");
+}
+
+/* Prints out the matchinfo. */
+static void ecn_print(const void *ip, const struct xt_entry_match *match,
+                      int numeric)
+{
+       const struct ipt_ecn_info *einfo =
+               (const struct ipt_ecn_info *)match->data;
+
+       printf("ECN match ");
+
+       if (einfo->operation & IPT_ECN_OP_MATCH_ECE) {
+               if (einfo->invert & IPT_ECN_OP_MATCH_ECE)
+                       fputc('!', stdout);
+               printf("ECE ");
+       }
+
+       if (einfo->operation & IPT_ECN_OP_MATCH_CWR) {
+               if (einfo->invert & IPT_ECN_OP_MATCH_CWR)
+                       fputc('!', stdout);
+               printf("CWR ");
+       }
+
+       if (einfo->operation & IPT_ECN_OP_MATCH_IP) {
+               if (einfo->invert & IPT_ECN_OP_MATCH_IP)
+                       fputc('!', stdout);
+               printf("ECT=%d ", einfo->ip_ect);
+       }
+}
+
+/* Saves the union ipt_matchinfo in parsable form to stdout. */
+static void ecn_save(const void *ip, const struct xt_entry_match *match)
+{
+       const struct ipt_ecn_info *einfo =
+               (const struct ipt_ecn_info *)match->data;
+       
+       if (einfo->operation & IPT_ECN_OP_MATCH_ECE) {
+               if (einfo->invert & IPT_ECN_OP_MATCH_ECE)
+                       printf("! ");
+               printf("--ecn-tcp-ece ");
+       }
+
+       if (einfo->operation & IPT_ECN_OP_MATCH_CWR) {
+               if (einfo->invert & IPT_ECN_OP_MATCH_CWR)
+                       printf("! ");
+               printf("--ecn-tcp-cwr ");
+       }
+
+       if (einfo->operation & IPT_ECN_OP_MATCH_IP) {
+               if (einfo->invert & IPT_ECN_OP_MATCH_IP)
+                       printf("! ");
+               printf("--ecn-ip-ect %d", einfo->ip_ect);
+       }
+}
+
+static struct xtables_match ecn_mt_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_match(&ecn_mt_reg);
+}