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157 lines
3.8 KiB
157 lines
3.8 KiB
/* Shared library add-on to iptables for DSCP
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*
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* (C) 2002 by Harald Welte <laforge@gnumonks.org>
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*
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* This program is distributed under the terms of GNU GPL v2, 1991
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*
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* libipt_dscp.c borrowed heavily from libipt_tos.c
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*
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* --class support added by Iain Barnes
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*
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* For a list of DSCP codepoints see
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* http://www.iana.org/assignments/dscp-registry
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*
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*/
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#include <stdio.h>
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#include <string.h>
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#include <xtables.h>
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#include <linux/netfilter/xt_dscp.h>
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/* This is evil, but it's my code - HW*/
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#include "dscp_helper.c"
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enum {
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O_DSCP = 0,
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O_DSCP_CLASS,
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F_DSCP = 1 << O_DSCP,
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F_DSCP_CLASS = 1 << O_DSCP_CLASS,
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};
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static void dscp_help(void)
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{
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printf(
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"dscp match options\n"
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"[!] --dscp value Match DSCP codepoint with numerical value\n"
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" This value can be in decimal (ex: 32)\n"
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" or in hex (ex: 0x20)\n"
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"[!] --dscp-class name Match the DiffServ class. This value may\n"
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" be any of the BE,EF, AFxx or CSx classes\n"
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"\n"
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" These two options are mutually exclusive !\n");
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}
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static const struct xt_option_entry dscp_opts[] = {
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{.name = "dscp", .id = O_DSCP, .excl = F_DSCP_CLASS,
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.type = XTTYPE_UINT8, .min = 0, .max = XT_DSCP_MAX,
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.flags = XTOPT_INVERT | XTOPT_PUT,
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XTOPT_POINTER(struct xt_dscp_info, dscp)},
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{.name = "dscp-class", .id = O_DSCP_CLASS, .excl = F_DSCP,
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.type = XTTYPE_STRING, .flags = XTOPT_INVERT},
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XTOPT_TABLEEND,
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};
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static void dscp_parse(struct xt_option_call *cb)
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{
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struct xt_dscp_info *dinfo = cb->data;
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xtables_option_parse(cb);
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switch (cb->entry->id) {
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case O_DSCP:
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if (cb->invert)
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dinfo->invert = 1;
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break;
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case O_DSCP_CLASS:
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dinfo->dscp = class_to_dscp(cb->arg);
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if (cb->invert)
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dinfo->invert = 1;
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break;
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}
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}
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static void dscp_check(struct xt_fcheck_call *cb)
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{
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if (cb->xflags == 0)
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xtables_error(PARAMETER_PROBLEM,
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"DSCP match: Parameter --dscp is required");
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}
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static void
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dscp_print(const void *ip, const struct xt_entry_match *match, int numeric)
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{
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const struct xt_dscp_info *dinfo =
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(const struct xt_dscp_info *)match->data;
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printf(" DSCP match %s0x%02x", dinfo->invert ? "!" : "", dinfo->dscp);
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}
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static void dscp_save(const void *ip, const struct xt_entry_match *match)
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{
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const struct xt_dscp_info *dinfo =
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(const struct xt_dscp_info *)match->data;
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printf("%s --dscp 0x%02x", dinfo->invert ? " !" : "", dinfo->dscp);
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}
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static int __dscp_xlate(struct xt_xlate *xl,
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const struct xt_xlate_mt_params *params)
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{
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const struct xt_dscp_info *dinfo =
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(const struct xt_dscp_info *)params->match->data;
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xt_xlate_add(xl, "dscp %s0x%02x", dinfo->invert ? "!= " : "",
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dinfo->dscp);
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return 1;
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}
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static int dscp_xlate(struct xt_xlate *xl,
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const struct xt_xlate_mt_params *params)
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{
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xt_xlate_add(xl, "ip ");
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return __dscp_xlate(xl, params);
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}
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static int dscp_xlate6(struct xt_xlate *xl,
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const struct xt_xlate_mt_params *params)
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{
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xt_xlate_add(xl, "ip6 ");
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return __dscp_xlate(xl, params);
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}
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static struct xtables_match dscp_mt_reg[] = {
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{
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.family = NFPROTO_IPV4,
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.name = "dscp",
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.version = XTABLES_VERSION,
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.size = XT_ALIGN(sizeof(struct xt_dscp_info)),
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.userspacesize = XT_ALIGN(sizeof(struct xt_dscp_info)),
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.help = dscp_help,
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.print = dscp_print,
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.save = dscp_save,
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.x6_parse = dscp_parse,
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.x6_fcheck = dscp_check,
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.x6_options = dscp_opts,
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.xlate = dscp_xlate,
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},
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{
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.family = NFPROTO_IPV6,
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.name = "dscp",
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.version = XTABLES_VERSION,
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.size = XT_ALIGN(sizeof(struct xt_dscp_info)),
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.userspacesize = XT_ALIGN(sizeof(struct xt_dscp_info)),
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.help = dscp_help,
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.print = dscp_print,
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.save = dscp_save,
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.x6_parse = dscp_parse,
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.x6_fcheck = dscp_check,
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.x6_options = dscp_opts,
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.xlate = dscp_xlate6,
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},
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};
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void _init(void)
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{
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xtables_register_matches(dscp_mt_reg, ARRAY_SIZE(dscp_mt_reg));
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}
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