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145 lines
3.8 KiB
145 lines
3.8 KiB
/* 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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