diff options
Diffstat (limited to 'extensions/libip6t_DNPT.c')
-rw-r--r-- | extensions/libip6t_DNPT.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/extensions/libip6t_DNPT.c b/extensions/libip6t_DNPT.c new file mode 100644 index 00000000..9e4dc5cf --- /dev/null +++ b/extensions/libip6t_DNPT.c @@ -0,0 +1,71 @@ +#include <stdio.h> +#include <xtables.h> +#include <linux/netfilter_ipv6/ip6_tables.h> +#include <linux/netfilter_ipv6/ip6t_NPT.h> + +enum { + O_SRC_PFX = 1 << 0, + O_DST_PFX = 1 << 1, +}; + +static const struct xt_option_entry SNPT_options[] = { + { .name = "src-pfx", .id = O_SRC_PFX, .type = XTTYPE_HOSTMASK, + .flags = XTOPT_MAND }, + { .name = "dst-pfx", .id = O_DST_PFX, .type = XTTYPE_HOSTMASK, + .flags = XTOPT_MAND }, + { } +}; + +static void SNPT_help(void) +{ + printf("SNPT target options:" + "\n" + " --src-pfx prefix/length\n" + " --dst-pfx prefix/length\n" + "\n"); +} + +static void SNPT_parse(struct xt_option_call *cb) +{ + struct ip6t_npt_tginfo *npt = cb->data; + + xtables_option_parse(cb); + switch (cb->entry->id) { + case O_SRC_PFX: + npt->src_pfx = cb->val.haddr; + npt->src_pfx_len = cb->val.hlen; + break; + case O_DST_PFX: + npt->dst_pfx = cb->val.haddr; + npt->dst_pfx_len = cb->val.hlen; + break; + } +} + +static void SNPT_print(const void *ip, const struct xt_entry_target *target, + int numeric) +{ + const struct ip6t_npt_tginfo *npt = (const void *)target->data; + + printf("src-pfx %s/%u ", xtables_ip6addr_to_numeric(&npt->src_pfx.in6), + npt->src_pfx_len); + printf("dst-pfx %s/%u ", xtables_ip6addr_to_numeric(&npt->dst_pfx.in6), + npt->dst_pfx_len); +} + +static struct xtables_target snpt_tg_reg = { + .name = "DNPT", + .version = XTABLES_VERSION, + .family = NFPROTO_IPV6, + .size = XT_ALIGN(sizeof(struct ip6t_npt_tginfo)), + .userspacesize = offsetof(struct ip6t_npt_tginfo, adjustment), + .help = SNPT_help, + .x6_parse = SNPT_parse, + .print = SNPT_print, + .x6_options = SNPT_options, +}; + +void _init(void) +{ + xtables_register_target(&snpt_tg_reg); +} |