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/* Shared library add-on to iptables for ECN, $Version$
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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_ECN.c borrowed heavily from libipt_DSCP.c
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*/
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#include <stdio.h>
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#include <xtables.h>
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#include <linux/netfilter_ipv4/ipt_ECN.h>
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enum {
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O_ECN_TCP_REMOVE = 0,
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O_ECN_TCP_CWR,
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O_ECN_TCP_ECE,
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O_ECN_IP_ECT,
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F_ECN_TCP_REMOVE = 1 << O_ECN_TCP_REMOVE,
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F_ECN_TCP_CWR = 1 << O_ECN_TCP_CWR,
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F_ECN_TCP_ECE = 1 << O_ECN_TCP_ECE,
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};
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static void ECN_help(void)
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{
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printf(
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"ECN target options\n"
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" --ecn-tcp-remove Remove all ECN bits from TCP header\n");
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}
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#if 0
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"ECN target v%s EXPERIMENTAL options (use with extreme care!)\n"
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" --ecn-ip-ect Set the IPv4 ECT codepoint (0 to 3)\n"
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" --ecn-tcp-cwr Set the IPv4 CWR bit (0 or 1)\n"
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" --ecn-tcp-ece Set the IPv4 ECE bit (0 or 1)\n",
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#endif
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static const struct xt_option_entry ECN_opts[] = {
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{.name = "ecn-tcp-remove", .id = O_ECN_TCP_REMOVE, .type = XTTYPE_NONE,
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.excl = F_ECN_TCP_CWR | F_ECN_TCP_ECE},
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{.name = "ecn-tcp-cwr", .id = O_ECN_TCP_CWR, .type = XTTYPE_UINT8,
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.min = 0, .max = 1, .excl = F_ECN_TCP_REMOVE},
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{.name = "ecn-tcp-ece", .id = O_ECN_TCP_ECE, .type = XTTYPE_UINT8,
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.min = 0, .max = 1, .excl = F_ECN_TCP_REMOVE},
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{.name = "ecn-ip-ect", .id = O_ECN_IP_ECT, .type = XTTYPE_UINT8,
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.min = 0, .max = 3},
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XTOPT_TABLEEND,
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};
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static void ECN_parse(struct xt_option_call *cb)
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{
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struct ipt_ECN_info *einfo = cb->data;
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xtables_option_parse(cb);
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switch (cb->entry->id) {
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case O_ECN_TCP_REMOVE:
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einfo->operation = IPT_ECN_OP_SET_ECE | IPT_ECN_OP_SET_CWR;
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einfo->proto.tcp.ece = 0;
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einfo->proto.tcp.cwr = 0;
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break;
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case O_ECN_TCP_CWR:
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einfo->operation |= IPT_ECN_OP_SET_CWR;
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einfo->proto.tcp.cwr = cb->val.u8;
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break;
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case O_ECN_TCP_ECE:
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einfo->operation |= IPT_ECN_OP_SET_ECE;
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einfo->proto.tcp.ece = cb->val.u8;
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break;
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case O_ECN_IP_ECT:
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einfo->operation |= IPT_ECN_OP_SET_IP;
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einfo->ip_ect = cb->val.u8;
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break;
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}
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}
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static void ECN_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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"ECN target: An operation is required");
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}
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static void ECN_print(const void *ip, const struct xt_entry_target *target,
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int numeric)
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{
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const struct ipt_ECN_info *einfo =
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(const struct ipt_ECN_info *)target->data;
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printf(" ECN");
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if (einfo->operation == (IPT_ECN_OP_SET_ECE|IPT_ECN_OP_SET_CWR)
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&& einfo->proto.tcp.ece == 0
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&& einfo->proto.tcp.cwr == 0)
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printf(" TCP remove");
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else {
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if (einfo->operation & IPT_ECN_OP_SET_ECE)
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printf(" ECE=%u", einfo->proto.tcp.ece);
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if (einfo->operation & IPT_ECN_OP_SET_CWR)
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printf(" CWR=%u", einfo->proto.tcp.cwr);
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if (einfo->operation & IPT_ECN_OP_SET_IP)
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printf(" ECT codepoint=%u", einfo->ip_ect);
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}
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}
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static void ECN_save(const void *ip, const struct xt_entry_target *target)
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{
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const struct ipt_ECN_info *einfo =
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(const struct ipt_ECN_info *)target->data;
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if (einfo->operation == (IPT_ECN_OP_SET_ECE|IPT_ECN_OP_SET_CWR)
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&& einfo->proto.tcp.ece == 0
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&& einfo->proto.tcp.cwr == 0)
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printf(" --ecn-tcp-remove");
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else {
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if (einfo->operation & IPT_ECN_OP_SET_ECE)
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printf(" --ecn-tcp-ece %d", einfo->proto.tcp.ece);
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if (einfo->operation & IPT_ECN_OP_SET_CWR)
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printf(" --ecn-tcp-cwr %d", einfo->proto.tcp.cwr);
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if (einfo->operation & IPT_ECN_OP_SET_IP)
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printf(" --ecn-ip-ect %d", einfo->ip_ect);
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}
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}
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static struct xtables_target ecn_tg_reg = {
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.name = "ECN",
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.version = XTABLES_VERSION,
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.family = NFPROTO_IPV4,
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.size = XT_ALIGN(sizeof(struct ipt_ECN_info)),
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.userspacesize = XT_ALIGN(sizeof(struct ipt_ECN_info)),
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.help = ECN_help,
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.print = ECN_print,
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.save = ECN_save,
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.x6_parse = ECN_parse,
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.x6_fcheck = ECN_check,
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.x6_options = ECN_opts,
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};
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void _init(void)
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{
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xtables_register_target(&ecn_tg_reg);
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}
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