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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 int __dscp_xlate(struct xt_xlate *xl,
     95 			const struct xt_xlate_mt_params *params)
     96 {
     97 	const struct xt_dscp_info *dinfo =
     98 		(const struct xt_dscp_info *)params->match->data;
     99 
    100 	xt_xlate_add(xl, "dscp %s0x%02x", dinfo->invert ? "!= " : "",
    101 		     dinfo->dscp);
    102 
    103 	return 1;
    104 }
    105 
    106 static int dscp_xlate(struct xt_xlate *xl,
    107 		      const struct xt_xlate_mt_params *params)
    108 {
    109 	xt_xlate_add(xl, "ip ");
    110 
    111 	return __dscp_xlate(xl, params);
    112 }
    113 
    114 static int dscp_xlate6(struct xt_xlate *xl,
    115 		       const struct xt_xlate_mt_params *params)
    116 {
    117 	xt_xlate_add(xl, "ip6 ");
    118 
    119 	return __dscp_xlate(xl, params);
    120 }
    121 
    122 static struct xtables_match dscp_mt_reg[] = {
    123 	{
    124 		.family		= NFPROTO_IPV4,
    125 		.name           = "dscp",
    126 		.version        = XTABLES_VERSION,
    127 		.size           = XT_ALIGN(sizeof(struct xt_dscp_info)),
    128 		.userspacesize	= XT_ALIGN(sizeof(struct xt_dscp_info)),
    129 		.help		= dscp_help,
    130 		.print		= dscp_print,
    131 		.save		= dscp_save,
    132 		.x6_parse	= dscp_parse,
    133 		.x6_fcheck	= dscp_check,
    134 		.x6_options	= dscp_opts,
    135 		.xlate		= dscp_xlate,
    136 	},
    137 	{
    138 		.family		= NFPROTO_IPV6,
    139 		.name           = "dscp",
    140 		.version        = XTABLES_VERSION,
    141 		.size           = XT_ALIGN(sizeof(struct xt_dscp_info)),
    142 		.userspacesize	= XT_ALIGN(sizeof(struct xt_dscp_info)),
    143 		.help		= dscp_help,
    144 		.print		= dscp_print,
    145 		.save		= dscp_save,
    146 		.x6_parse	= dscp_parse,
    147 		.x6_fcheck	= dscp_check,
    148 		.x6_options	= dscp_opts,
    149 		.xlate		= dscp_xlate6,
    150 	},
    151 };
    152 
    153 void _init(void)
    154 {
    155 	xtables_register_matches(dscp_mt_reg, ARRAY_SIZE(dscp_mt_reg));
    156 }
    157