/*
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* Copyright (c) 2012-2013 Patrick McHardy <kaber@trash.net>
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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_ipv6/ip6_tables.h>
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#include <linux/netfilter_ipv6/ip6t_NPT.h>
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enum {
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O_SRC_PFX = 1 << 0,
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O_DST_PFX = 1 << 1,
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};
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static const struct xt_option_entry SNPT_options[] = {
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{ .name = "src-pfx", .id = O_SRC_PFX, .type = XTTYPE_HOSTMASK,
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.flags = XTOPT_MAND },
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{ .name = "dst-pfx", .id = O_DST_PFX, .type = XTTYPE_HOSTMASK,
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.flags = XTOPT_MAND },
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{ }
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};
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static void SNPT_help(void)
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{
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printf("SNPT target options:"
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"\n"
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" --src-pfx prefix/length\n"
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" --dst-pfx prefix/length\n"
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"\n");
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}
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static void SNPT_parse(struct xt_option_call *cb)
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{
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struct ip6t_npt_tginfo *npt = cb->data;
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xtables_option_parse(cb);
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switch (cb->entry->id) {
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case O_SRC_PFX:
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npt->src_pfx = cb->val.haddr;
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npt->src_pfx_len = cb->val.hlen;
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break;
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case O_DST_PFX:
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npt->dst_pfx = cb->val.haddr;
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npt->dst_pfx_len = cb->val.hlen;
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break;
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}
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}
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static void SNPT_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 ip6t_npt_tginfo *npt = (const void *)target->data;
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printf(" SNPT src-pfx %s/%u", xtables_ip6addr_to_numeric(&npt->src_pfx.in6),
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npt->src_pfx_len);
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printf(" dst-pfx %s/%u", xtables_ip6addr_to_numeric(&npt->dst_pfx.in6),
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npt->dst_pfx_len);
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}
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static void SNPT_save(const void *ip, const struct xt_entry_target *target)
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{
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static const struct in6_addr zero_addr;
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const struct ip6t_npt_tginfo *info = (const void *)target->data;
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if (memcmp(&info->src_pfx.in6, &zero_addr, sizeof(zero_addr)) != 0 ||
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info->src_pfx_len != 0)
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printf(" --src-pfx %s/%u",
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xtables_ip6addr_to_numeric(&info->src_pfx.in6),
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info->src_pfx_len);
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if (memcmp(&info->dst_pfx.in6, &zero_addr, sizeof(zero_addr)) != 0 ||
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info->dst_pfx_len != 0)
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printf(" --dst-pfx %s/%u",
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xtables_ip6addr_to_numeric(&info->dst_pfx.in6),
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info->dst_pfx_len);
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}
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static struct xtables_target snpt_tg_reg = {
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.name = "SNPT",
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.version = XTABLES_VERSION,
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.family = NFPROTO_IPV6,
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.size = XT_ALIGN(sizeof(struct ip6t_npt_tginfo)),
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.userspacesize = offsetof(struct ip6t_npt_tginfo, adjustment),
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.help = SNPT_help,
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.x6_parse = SNPT_parse,
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.print = SNPT_print,
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.save = SNPT_save,
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.x6_options = SNPT_options,
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};
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void _init(void)
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{
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xtables_register_target(&snpt_tg_reg);
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}
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