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      1 /* Shared library add-on to iptables for DSCP
      2  *
      3  * (C) 2002 by Harald Welte <laforge (at) gnumonks.org>
      4  *
      5  * This program is distributed under the terms of GNU GPL v2, 1991
      6  *
      7  * libipt_dscp.c borrowed heavily from libipt_tos.c
      8  *
      9  * --class support added by Iain Barnes
     10  *
     11  * For a list of DSCP codepoints see
     12  * http://www.iana.org/assignments/dscp-registry
     13  *
     14  */
     15 #include <stdio.h>
     16 #include <string.h>
     17 #include <xtables.h>
     18 #include <linux/netfilter/xt_dscp.h>
     19 
     20 /* This is evil, but it's my code - HW*/
     21 #include "dscp_helper.c"
     22 
     23 enum {
     24 	O_DSCP = 0,
     25 	O_DSCP_CLASS,
     26 	F_DSCP       = 1 << O_DSCP,
     27 	F_DSCP_CLASS = 1 << O_DSCP_CLASS,
     28 };
     29 
     30 static void dscp_help(void)
     31 {
     32 	printf(
     33 "dscp match options\n"
     34 "[!] --dscp value		Match DSCP codepoint with numerical value\n"
     35 "  		                This value can be in decimal (ex: 32)\n"
     36 "               		or in hex (ex: 0x20)\n"
     37 "[!] --dscp-class name		Match the DiffServ class. This value may\n"
     38 "				be any of the BE,EF, AFxx or CSx classes\n"
     39 "\n"
     40 "				These two options are mutually exclusive !\n");
     41 }
     42 
     43 static const struct xt_option_entry dscp_opts[] = {
     44 	{.name = "dscp", .id = O_DSCP, .excl = F_DSCP_CLASS,
     45 	 .type = XTTYPE_UINT8, .min = 0, .max = XT_DSCP_MAX,
     46 	 .flags = XTOPT_INVERT | XTOPT_PUT,
     47 	 XTOPT_POINTER(struct xt_dscp_info, dscp)},
     48 	{.name = "dscp-class", .id = O_DSCP_CLASS, .excl = F_DSCP,
     49 	 .type = XTTYPE_STRING, .flags = XTOPT_INVERT},
     50 	XTOPT_TABLEEND,
     51 };
     52 
     53 static void dscp_parse(struct xt_option_call *cb)
     54 {
     55 	struct xt_dscp_info *dinfo = cb->data;
     56 
     57 	xtables_option_parse(cb);
     58 	switch (cb->entry->id) {
     59 	case O_DSCP:
     60 		if (cb->invert)
     61 			dinfo->invert = 1;
     62 		break;
     63 	case O_DSCP_CLASS:
     64 		dinfo->dscp = class_to_dscp(cb->arg);
     65 		if (cb->invert)
     66 			dinfo->invert = 1;
     67 		break;
     68 	}
     69 }
     70 
     71 static void dscp_check(struct xt_fcheck_call *cb)
     72 {
     73 	if (cb->xflags == 0)
     74 		xtables_error(PARAMETER_PROBLEM,
     75 		           "DSCP match: Parameter --dscp is required");
     76 }
     77 
     78 static void
     79 dscp_print(const void *ip, const struct xt_entry_match *match, int numeric)
     80 {
     81 	const struct xt_dscp_info *dinfo =
     82 		(const struct xt_dscp_info *)match->data;
     83 	printf(" DSCP match %s0x%02x", dinfo->invert ? "!" : "", dinfo->dscp);
     84 }
     85 
     86 static void dscp_save(const void *ip, const struct xt_entry_match *match)
     87 {
     88 	const struct xt_dscp_info *dinfo =
     89 		(const struct xt_dscp_info *)match->data;
     90 
     91 	printf("%s --dscp 0x%02x", dinfo->invert ? " !" : "", dinfo->dscp);
     92 }
     93 
     94 static struct xtables_match dscp_match = {
     95 	.family		= NFPROTO_UNSPEC,
     96 	.name 		= "dscp",
     97 	.version 	= XTABLES_VERSION,
     98 	.size 		= XT_ALIGN(sizeof(struct xt_dscp_info)),
     99 	.userspacesize	= XT_ALIGN(sizeof(struct xt_dscp_info)),
    100 	.help		= dscp_help,
    101 	.print		= dscp_print,
    102 	.save		= dscp_save,
    103 	.x6_parse	= dscp_parse,
    104 	.x6_fcheck	= dscp_check,
    105 	.x6_options	= dscp_opts,
    106 };
    107 
    108 void _init(void)
    109 {
    110 	xtables_register_match(&dscp_match);
    111 }
    112