Merge commit 'origin/trunk@12184' into fedora

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

diff --git a/trunk/extensions/libxt_dscp.c b/trunk/extensions/libxt_dscp.c
new file mode 100644 (file)
index 0000000..6aed499
--- /dev/null
+++ b/trunk/extensions/libxt_dscp.c
@@ -0,0 +1,179 @@
+/* Shared library add-on to iptables for DSCP
+ *
+ * (C) 2002 by Harald Welte <laforge@gnumonks.org>
+ *
+ * This program is distributed under the terms of GNU GPL v2, 1991
+ *
+ * libipt_dscp.c borrowed heavily from libipt_tos.c
+ *
+ * --class support added by Iain Barnes
+ * 
+ * For a list of DSCP codepoints see 
+ * http://www.iana.org/assignments/dscp-registry
+ *
+ */
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+
+#include <xtables.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_dscp.h>
+
+/* This is evil, but it's my code - HW*/
+#include "dscp_helper.c"
+
+static void dscp_help(void)
+{
+       printf(
+"dscp match options\n"
+"[!] --dscp value              Match DSCP codepoint with numerical value\n"
+"                              This value can be in decimal (ex: 32)\n"
+"                              or in hex (ex: 0x20)\n"
+"[!] --dscp-class name         Match the DiffServ class. This value may\n"
+"                              be any of the BE,EF, AFxx or CSx classes\n"
+"\n"
+"                              These two options are mutually exclusive !\n");
+}
+
+static const struct option dscp_opts[] = {
+       { "dscp", 1, NULL, 'F' },
+       { "dscp-class", 1, NULL, 'G' },
+       { .name = NULL }
+};
+
+static void
+parse_dscp(const char *s, struct xt_dscp_info *dinfo)
+{
+       unsigned int dscp;
+       
+       if (string_to_number(s, 0, 255, &dscp) == -1)
+               exit_error(PARAMETER_PROBLEM,
+                          "Invalid dscp `%s'\n", s);
+
+       if (dscp > XT_DSCP_MAX)
+               exit_error(PARAMETER_PROBLEM,
+                          "DSCP `%d` out of range\n", dscp);
+
+       dinfo->dscp = (u_int8_t )dscp;
+       return;
+}
+
+
+static void
+parse_class(const char *s, struct xt_dscp_info *dinfo)
+{
+       unsigned int dscp = class_to_dscp(s);
+
+       /* Assign the value */
+       dinfo->dscp = (u_int8_t)dscp;
+}
+
+
+static int
+dscp_parse(int c, char **argv, int invert, unsigned int *flags,
+           const void *entry, struct xt_entry_match **match)
+{
+       struct xt_dscp_info *dinfo
+               = (struct xt_dscp_info *)(*match)->data;
+
+       switch (c) {
+       case 'F':
+               if (*flags)
+                       exit_error(PARAMETER_PROBLEM,
+                                  "DSCP match: Only use --dscp ONCE!");
+               check_inverse(optarg, &invert, &optind, 0);
+               parse_dscp(argv[optind-1], dinfo);
+               if (invert)
+                       dinfo->invert = 1;
+               *flags = 1;
+               break;
+
+       case 'G':
+               if (*flags)
+                       exit_error(PARAMETER_PROBLEM,
+                                       "DSCP match: Only use --dscp-class ONCE!");
+               check_inverse(optarg, &invert, &optind, 0);
+               parse_class(argv[optind - 1], dinfo);
+               if (invert)
+                       dinfo->invert = 1;
+               *flags = 1;
+               break;
+
+       default:
+               return 0;
+       }
+
+       return 1;
+}
+
+static void dscp_check(unsigned int flags)
+{
+       if (!flags)
+               exit_error(PARAMETER_PROBLEM,
+                          "DSCP match: Parameter --dscp is required");
+}
+
+static void
+print_dscp(u_int8_t dscp, int invert, int numeric)
+{
+       if (invert)
+               fputc('!', stdout);
+
+       printf("0x%02x ", dscp);
+}
+
+/* Prints out the matchinfo. */
+static void
+dscp_print(const void *ip, const struct xt_entry_match *match, int numeric)
+{
+       const struct xt_dscp_info *dinfo =
+               (const struct xt_dscp_info *)match->data;
+       printf("DSCP match ");
+       print_dscp(dinfo->dscp, dinfo->invert, numeric);
+}
+
+/* Saves the union ipt_matchinfo in parsable form to stdout. */
+static void dscp_save(const void *ip, const struct xt_entry_match *match)
+{
+       const struct xt_dscp_info *dinfo =
+               (const struct xt_dscp_info *)match->data;
+
+       printf("--dscp ");
+       print_dscp(dinfo->dscp, dinfo->invert, 1);
+}
+
+static struct xtables_match dscp_match = {
+       .family         = AF_INET,
+       .name           = "dscp",
+       .version        = XTABLES_VERSION,
+       .size           = XT_ALIGN(sizeof(struct xt_dscp_info)),
+       .userspacesize  = XT_ALIGN(sizeof(struct xt_dscp_info)),
+       .help           = dscp_help,
+       .parse          = dscp_parse,
+       .final_check    = dscp_check,
+       .print          = dscp_print,
+       .save           = dscp_save,
+       .extra_opts     = dscp_opts,
+};
+
+static struct xtables_match dscp_match6 = {
+       .family         = AF_INET6,
+       .name           = "dscp",
+       .version        = XTABLES_VERSION,
+       .size           = XT_ALIGN(sizeof(struct xt_dscp_info)),
+       .userspacesize  = XT_ALIGN(sizeof(struct xt_dscp_info)),
+       .help           = dscp_help,
+       .parse          = dscp_parse,
+       .final_check    = dscp_check,
+       .print          = dscp_print,
+       .save           = dscp_save,
+       .extra_opts     = dscp_opts,
+};
+
+void _init(void)
+{
+       xtables_register_match(&dscp_match);
+       xtables_register_match(&dscp_match6);
+}