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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <xtables.h>
#include <limits.h> /* INT_MAX in ip_tables.h */
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter/nf_nat.h>
enum {
O_TO_PORTS = 0,
O_RANDOM,
F_TO_PORTS = 1 << O_TO_PORTS,
F_RANDOM = 1 << O_RANDOM,
};
static void REDIRECT_help(void)
{
printf(
"REDIRECT target options:\n"
" --to-ports <port>[-<port>]\n"
" Port (range) to map to.\n"
" [--random]\n");
}
static const struct xt_option_entry REDIRECT_opts[] = {
{.name = "to-ports", .id = O_TO_PORTS, .type = XTTYPE_STRING},
{.name = "random", .id = O_RANDOM, .type = XTTYPE_NONE},
XTOPT_TABLEEND,
};
static void REDIRECT_init(struct xt_entry_target *t)
{
struct nf_nat_ipv4_multi_range_compat *mr = (struct nf_nat_ipv4_multi_range_compat *)t->data;
/* Actually, it's 0, but it's ignored at the moment. */
mr->rangesize = 1;
}
/* Parses ports */
static void
parse_ports(const char *arg, struct nf_nat_ipv4_multi_range_compat *mr)
{
char *end = "";
unsigned int port, maxport;
mr->range[0].flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
if (!xtables_strtoui(arg, &end, &port, 0, UINT16_MAX) &&
(port = xtables_service_to_port(arg, NULL)) == (unsigned)-1)
xtables_param_act(XTF_BAD_VALUE, "REDIRECT", "--to-ports", arg);
switch (*end) {
case '\0':
mr->range[0].min.tcp.port
= mr->range[0].max.tcp.port
= htons(port);
return;
case '-':
if (!xtables_strtoui(end + 1, NULL, &maxport, 0, UINT16_MAX) &&
(maxport = xtables_service_to_port(end + 1, NULL)) == (unsigned)-1)
break;
if (maxport < port)
break;
mr->range[0].min.tcp.port = htons(port);
mr->range[0].max.tcp.port = htons(maxport);
return;
default:
break;
}
xtables_param_act(XTF_BAD_VALUE, "REDIRECT", "--to-ports", arg);
}
static void REDIRECT_parse(struct xt_option_call *cb)
{
const struct ipt_entry *entry = cb->xt_entry;
struct nf_nat_ipv4_multi_range_compat *mr = (void *)(*cb->target)->data;
int portok;
if (entry->ip.proto == IPPROTO_TCP
|| entry->ip.proto == IPPROTO_UDP
|| entry->ip.proto == IPPROTO_SCTP
|| entry->ip.proto == IPPROTO_DCCP
|| entry->ip.proto == IPPROTO_ICMP)
portok = 1;
else
portok = 0;
xtables_option_parse(cb);
switch (cb->entry->id) {
case O_TO_PORTS:
if (!portok)
xtables_error(PARAMETER_PROBLEM,
"Need TCP, UDP, SCTP or DCCP with port specification");
parse_ports(cb->arg, mr);
if (cb->xflags & F_RANDOM)
mr->range[0].flags |= NF_NAT_RANGE_PROTO_RANDOM;
break;
case O_RANDOM:
if (cb->xflags & F_TO_PORTS)
mr->range[0].flags |= NF_NAT_RANGE_PROTO_RANDOM;
break;
}
}
static void REDIRECT_print(const void *ip, const struct xt_entry_target *target,
int numeric)
{
const struct nf_nat_ipv4_multi_range_compat *mr = (const void *)target->data;
const struct nf_nat_ipv4_range *r = &mr->range[0];
if (r->flags & NF_NAT_RANGE_PROTO_SPECIFIED) {
printf(" redir ports ");
printf("%hu", ntohs(r->min.tcp.port));
if (r->max.tcp.port != r->min.tcp.port)
printf("-%hu", ntohs(r->max.tcp.port));
if (mr->range[0].flags & NF_NAT_RANGE_PROTO_RANDOM)
printf(" random");
}
}
static void REDIRECT_save(const void *ip, const struct xt_entry_target *target)
{
const struct nf_nat_ipv4_multi_range_compat *mr = (const void *)target->data;
const struct nf_nat_ipv4_range *r = &mr->range[0];
if (r->flags & NF_NAT_RANGE_PROTO_SPECIFIED) {
printf(" --to-ports ");
printf("%hu", ntohs(r->min.tcp.port));
if (r->max.tcp.port != r->min.tcp.port)
printf("-%hu", ntohs(r->max.tcp.port));
if (mr->range[0].flags & NF_NAT_RANGE_PROTO_RANDOM)
printf(" --random");
}
}
static struct xtables_target redirect_tg_reg = {
.name = "REDIRECT",
.version = XTABLES_VERSION,
.family = NFPROTO_IPV4,
.size = XT_ALIGN(sizeof(struct nf_nat_ipv4_multi_range_compat)),
.userspacesize = XT_ALIGN(sizeof(struct nf_nat_ipv4_multi_range_compat)),
.help = REDIRECT_help,
.init = REDIRECT_init,
.x6_parse = REDIRECT_parse,
.print = REDIRECT_print,
.save = REDIRECT_save,
.x6_options = REDIRECT_opts,
};
void _init(void)
{
xtables_register_target(&redirect_tg_reg);
}
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