|
Packit |
7b22a4 |
#include <stdio.h>
|
|
Packit |
7b22a4 |
#include <string.h>
|
|
Packit |
7b22a4 |
#include <stdlib.h>
|
|
Packit |
7b22a4 |
#include <xtables.h>
|
|
Packit |
7b22a4 |
#include <limits.h> /* INT_MAX in ip_tables.h */
|
|
Packit |
7b22a4 |
#include <linux/netfilter_ipv4/ip_tables.h>
|
|
Packit |
7b22a4 |
#include <linux/netfilter/nf_nat.h>
|
|
Packit |
7b22a4 |
|
|
Packit |
7b22a4 |
enum {
|
|
Packit |
7b22a4 |
O_TO_PORTS = 0,
|
|
Packit |
7b22a4 |
O_RANDOM,
|
|
Packit |
7b22a4 |
F_TO_PORTS = 1 << O_TO_PORTS,
|
|
Packit |
7b22a4 |
F_RANDOM = 1 << O_RANDOM,
|
|
Packit |
7b22a4 |
};
|
|
Packit |
7b22a4 |
|
|
Packit |
7b22a4 |
static void REDIRECT_help(void)
|
|
Packit |
7b22a4 |
{
|
|
Packit |
7b22a4 |
printf(
|
|
Packit |
7b22a4 |
"REDIRECT target options:\n"
|
|
Packit |
7b22a4 |
" --to-ports <port>[-<port>]\n"
|
|
Packit |
7b22a4 |
" Port (range) to map to.\n"
|
|
Packit |
7b22a4 |
" [--random]\n");
|
|
Packit |
7b22a4 |
}
|
|
Packit |
7b22a4 |
|
|
Packit |
7b22a4 |
static const struct xt_option_entry REDIRECT_opts[] = {
|
|
Packit |
7b22a4 |
{.name = "to-ports", .id = O_TO_PORTS, .type = XTTYPE_STRING},
|
|
Packit |
7b22a4 |
{.name = "random", .id = O_RANDOM, .type = XTTYPE_NONE},
|
|
Packit |
7b22a4 |
XTOPT_TABLEEND,
|
|
Packit |
7b22a4 |
};
|
|
Packit |
7b22a4 |
|
|
Packit |
7b22a4 |
static void REDIRECT_init(struct xt_entry_target *t)
|
|
Packit |
7b22a4 |
{
|
|
Packit |
7b22a4 |
struct nf_nat_ipv4_multi_range_compat *mr = (struct nf_nat_ipv4_multi_range_compat *)t->data;
|
|
Packit |
7b22a4 |
|
|
Packit |
7b22a4 |
/* Actually, it's 0, but it's ignored at the moment. */
|
|
Packit |
7b22a4 |
mr->rangesize = 1;
|
|
Packit |
7b22a4 |
}
|
|
Packit |
7b22a4 |
|
|
Packit |
7b22a4 |
/* Parses ports */
|
|
Packit |
7b22a4 |
static void
|
|
Packit |
7b22a4 |
parse_ports(const char *arg, struct nf_nat_ipv4_multi_range_compat *mr)
|
|
Packit |
7b22a4 |
{
|
|
Packit |
7b22a4 |
char *end = "";
|
|
Packit |
7b22a4 |
unsigned int port, maxport;
|
|
Packit |
7b22a4 |
|
|
Packit |
7b22a4 |
mr->range[0].flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
|
|
Packit |
7b22a4 |
|
|
Packit |
7b22a4 |
if (!xtables_strtoui(arg, &end, &port, 0, UINT16_MAX) &&
|
|
Packit |
7b22a4 |
(port = xtables_service_to_port(arg, NULL)) == (unsigned)-1)
|
|
Packit |
7b22a4 |
xtables_param_act(XTF_BAD_VALUE, "REDIRECT", "--to-ports", arg);
|
|
Packit |
7b22a4 |
|
|
Packit |
7b22a4 |
switch (*end) {
|
|
Packit |
7b22a4 |
case '\0':
|
|
Packit |
7b22a4 |
mr->range[0].min.tcp.port
|
|
Packit |
7b22a4 |
= mr->range[0].max.tcp.port
|
|
Packit |
7b22a4 |
= htons(port);
|
|
Packit |
7b22a4 |
return;
|
|
Packit |
7b22a4 |
case '-':
|
|
Packit |
7b22a4 |
if (!xtables_strtoui(end + 1, NULL, &maxport, 0, UINT16_MAX) &&
|
|
Packit |
7b22a4 |
(maxport = xtables_service_to_port(end + 1, NULL)) == (unsigned)-1)
|
|
Packit |
7b22a4 |
break;
|
|
Packit |
7b22a4 |
|
|
Packit |
7b22a4 |
if (maxport < port)
|
|
Packit |
7b22a4 |
break;
|
|
Packit |
7b22a4 |
|
|
Packit |
7b22a4 |
mr->range[0].min.tcp.port = htons(port);
|
|
Packit |
7b22a4 |
mr->range[0].max.tcp.port = htons(maxport);
|
|
Packit |
7b22a4 |
return;
|
|
Packit |
7b22a4 |
default:
|
|
Packit |
7b22a4 |
break;
|
|
Packit |
7b22a4 |
}
|
|
Packit |
7b22a4 |
xtables_param_act(XTF_BAD_VALUE, "REDIRECT", "--to-ports", arg);
|
|
Packit |
7b22a4 |
}
|
|
Packit |
7b22a4 |
|
|
Packit |
7b22a4 |
static void REDIRECT_parse(struct xt_option_call *cb)
|
|
Packit |
7b22a4 |
{
|
|
Packit |
7b22a4 |
const struct ipt_entry *entry = cb->xt_entry;
|
|
Packit |
7b22a4 |
struct nf_nat_ipv4_multi_range_compat *mr = (void *)(*cb->target)->data;
|
|
Packit |
7b22a4 |
int portok;
|
|
Packit |
7b22a4 |
|
|
Packit |
7b22a4 |
if (entry->ip.proto == IPPROTO_TCP
|
|
Packit |
7b22a4 |
|| entry->ip.proto == IPPROTO_UDP
|
|
Packit |
7b22a4 |
|| entry->ip.proto == IPPROTO_SCTP
|
|
Packit |
7b22a4 |
|| entry->ip.proto == IPPROTO_DCCP
|
|
Packit |
7b22a4 |
|| entry->ip.proto == IPPROTO_ICMP)
|
|
Packit |
7b22a4 |
portok = 1;
|
|
Packit |
7b22a4 |
else
|
|
Packit |
7b22a4 |
portok = 0;
|
|
Packit |
7b22a4 |
|
|
Packit |
7b22a4 |
xtables_option_parse(cb);
|
|
Packit |
7b22a4 |
switch (cb->entry->id) {
|
|
Packit |
7b22a4 |
case O_TO_PORTS:
|
|
Packit |
7b22a4 |
if (!portok)
|
|
Packit |
7b22a4 |
xtables_error(PARAMETER_PROBLEM,
|
|
Packit |
7b22a4 |
"Need TCP, UDP, SCTP or DCCP with port specification");
|
|
Packit |
7b22a4 |
parse_ports(cb->arg, mr);
|
|
Packit |
7b22a4 |
if (cb->xflags & F_RANDOM)
|
|
Packit |
7b22a4 |
mr->range[0].flags |= NF_NAT_RANGE_PROTO_RANDOM;
|
|
Packit |
7b22a4 |
break;
|
|
Packit |
7b22a4 |
case O_RANDOM:
|
|
Packit |
7b22a4 |
if (cb->xflags & F_TO_PORTS)
|
|
Packit |
7b22a4 |
mr->range[0].flags |= NF_NAT_RANGE_PROTO_RANDOM;
|
|
Packit |
7b22a4 |
break;
|
|
Packit |
7b22a4 |
}
|
|
Packit |
7b22a4 |
}
|
|
Packit |
7b22a4 |
|
|
Packit |
7b22a4 |
static void REDIRECT_print(const void *ip, const struct xt_entry_target *target,
|
|
Packit |
7b22a4 |
int numeric)
|
|
Packit |
7b22a4 |
{
|
|
Packit |
7b22a4 |
const struct nf_nat_ipv4_multi_range_compat *mr = (const void *)target->data;
|
|
Packit |
7b22a4 |
const struct nf_nat_ipv4_range *r = &mr->range[0];
|
|
Packit |
7b22a4 |
|
|
Packit |
7b22a4 |
if (r->flags & NF_NAT_RANGE_PROTO_SPECIFIED) {
|
|
Packit |
7b22a4 |
printf(" redir ports ");
|
|
Packit |
7b22a4 |
printf("%hu", ntohs(r->min.tcp.port));
|
|
Packit |
7b22a4 |
if (r->max.tcp.port != r->min.tcp.port)
|
|
Packit |
7b22a4 |
printf("-%hu", ntohs(r->max.tcp.port));
|
|
Packit |
7b22a4 |
if (mr->range[0].flags & NF_NAT_RANGE_PROTO_RANDOM)
|
|
Packit |
7b22a4 |
printf(" random");
|
|
Packit |
7b22a4 |
}
|
|
Packit |
7b22a4 |
}
|
|
Packit |
7b22a4 |
|
|
Packit |
7b22a4 |
static void REDIRECT_save(const void *ip, const struct xt_entry_target *target)
|
|
Packit |
7b22a4 |
{
|
|
Packit |
7b22a4 |
const struct nf_nat_ipv4_multi_range_compat *mr = (const void *)target->data;
|
|
Packit |
7b22a4 |
const struct nf_nat_ipv4_range *r = &mr->range[0];
|
|
Packit |
7b22a4 |
|
|
Packit |
7b22a4 |
if (r->flags & NF_NAT_RANGE_PROTO_SPECIFIED) {
|
|
Packit |
7b22a4 |
printf(" --to-ports ");
|
|
Packit |
7b22a4 |
printf("%hu", ntohs(r->min.tcp.port));
|
|
Packit |
7b22a4 |
if (r->max.tcp.port != r->min.tcp.port)
|
|
Packit |
7b22a4 |
printf("-%hu", ntohs(r->max.tcp.port));
|
|
Packit |
7b22a4 |
if (mr->range[0].flags & NF_NAT_RANGE_PROTO_RANDOM)
|
|
Packit |
7b22a4 |
printf(" --random");
|
|
Packit |
7b22a4 |
}
|
|
Packit |
7b22a4 |
}
|
|
Packit |
7b22a4 |
|
|
Packit |
7b22a4 |
static int REDIRECT_xlate(struct xt_xlate *xl,
|
|
Packit |
7b22a4 |
const struct xt_xlate_tg_params *params)
|
|
Packit |
7b22a4 |
{
|
|
Packit |
7b22a4 |
const struct nf_nat_ipv4_multi_range_compat *mr =
|
|
Packit |
7b22a4 |
(const void *)params->target->data;
|
|
Packit |
7b22a4 |
const struct nf_nat_ipv4_range *r = &mr->range[0];
|
|
Packit |
7b22a4 |
|
|
Packit |
7b22a4 |
if (r->flags & NF_NAT_RANGE_PROTO_SPECIFIED) {
|
|
Packit |
7b22a4 |
xt_xlate_add(xl, "redirect to :%hu", ntohs(r->min.tcp.port));
|
|
Packit |
7b22a4 |
if (r->max.tcp.port != r->min.tcp.port)
|
|
Packit |
7b22a4 |
xt_xlate_add(xl, "-%hu ", ntohs(r->max.tcp.port));
|
|
Packit |
7b22a4 |
if (mr->range[0].flags & NF_NAT_RANGE_PROTO_RANDOM)
|
|
Packit |
7b22a4 |
xt_xlate_add(xl, " random ");
|
|
Packit |
7b22a4 |
}
|
|
Packit |
7b22a4 |
|
|
Packit |
7b22a4 |
return 1;
|
|
Packit |
7b22a4 |
}
|
|
Packit |
7b22a4 |
|
|
Packit |
7b22a4 |
static struct xtables_target redirect_tg_reg = {
|
|
Packit |
7b22a4 |
.name = "REDIRECT",
|
|
Packit |
7b22a4 |
.version = XTABLES_VERSION,
|
|
Packit |
7b22a4 |
.family = NFPROTO_IPV4,
|
|
Packit |
7b22a4 |
.size = XT_ALIGN(sizeof(struct nf_nat_ipv4_multi_range_compat)),
|
|
Packit |
7b22a4 |
.userspacesize = XT_ALIGN(sizeof(struct nf_nat_ipv4_multi_range_compat)),
|
|
Packit |
7b22a4 |
.help = REDIRECT_help,
|
|
Packit |
7b22a4 |
.init = REDIRECT_init,
|
|
Packit |
7b22a4 |
.x6_parse = REDIRECT_parse,
|
|
Packit |
7b22a4 |
.print = REDIRECT_print,
|
|
Packit |
7b22a4 |
.save = REDIRECT_save,
|
|
Packit |
7b22a4 |
.x6_options = REDIRECT_opts,
|
|
Packit |
7b22a4 |
.xlate = REDIRECT_xlate,
|
|
Packit |
7b22a4 |
};
|
|
Packit |
7b22a4 |
|
|
Packit |
7b22a4 |
void _init(void)
|
|
Packit |
7b22a4 |
{
|
|
Packit |
7b22a4 |
xtables_register_target(&redirect_tg_reg);
|
|
Packit |
7b22a4 |
}
|