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#include <stdio.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.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>
#ifndef NF_NAT_RANGE_PROTO_RANDOM_FULLY
#define NF_NAT_RANGE_PROTO_RANDOM_FULLY (1 << 4)
#endif
enum {
O_TO_PORTS = 0,
O_RANDOM,
O_RANDOM_FULLY,
O_TO_SRC,
};
static void FULLCONENAT_help(void)
{
printf(
"FULLCONENAT target options:\n"
" --to-source [<ipaddr>[-<ipaddr>]]\n"
" Address to map source to.\n"
" --to-ports <port>[-<port>]\n"
" Port (range) to map to.\n"
" --random\n"
" Randomize source port.\n"
" --random-fully\n"
" Fully randomize source port.\n");
}
static const struct xt_option_entry FULLCONENAT_opts[] = {
{.name = "to-ports", .id = O_TO_PORTS, .type = XTTYPE_STRING},
{.name = "random", .id = O_RANDOM, .type = XTTYPE_NONE},
{.name = "random-fully", .id = O_RANDOM_FULLY, .type = XTTYPE_NONE},
{.name = "to-source", .id = O_TO_SRC, .type = XTTYPE_STRING},
XTOPT_TABLEEND,
};
static void parse_to(const char *orig_arg, struct nf_nat_ipv4_multi_range_compat *mr)
{
char *arg, *dash, *error;
const struct in_addr *ip;
arg = strdup(orig_arg);
if (arg == NULL)
xtables_error(RESOURCE_PROBLEM, "strdup");
mr->range[0].flags |= NF_NAT_RANGE_MAP_IPS;
dash = strchr(arg, '-');
if (dash)
*dash = '\0';
ip = xtables_numeric_to_ipaddr(arg);
if (!ip)
xtables_error(PARAMETER_PROBLEM, "Bad IP address \"%s\"\n",
arg);
mr->range[0].min_ip = ip->s_addr;
if (dash) {
ip = xtables_numeric_to_ipaddr(dash+1);
if (!ip)
xtables_error(PARAMETER_PROBLEM, "Bad IP address \"%s\"\n",
dash+1);
mr->range[0].max_ip = ip->s_addr;
} else
mr->range[0].max_ip = mr->range[0].min_ip;
free(arg);
}
static void FULLCONENAT_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))
xtables_param_act(XTF_BAD_VALUE, "FULLCONENAT", "--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))
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, "FULLCONENAT", "--to-ports", arg);
}
static void FULLCONENAT_parse(struct xt_option_call *cb)
{
const struct ipt_entry *entry = cb->xt_entry;
int portok;
struct nf_nat_ipv4_multi_range_compat *mr = cb->data;
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);
break;
case O_TO_SRC:
parse_to(cb->arg, mr);
break;
case O_RANDOM:
mr->range[0].flags |= NF_NAT_RANGE_PROTO_RANDOM;
break;
case O_RANDOM_FULLY:
mr->range[0].flags |= NF_NAT_RANGE_PROTO_RANDOM_FULLY;
break;
}
}
static void
FULLCONENAT_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_MAP_IPS) {
struct in_addr a;
a.s_addr = r->min_ip;
printf(" to:%s", xtables_ipaddr_to_numeric(&a));
if (r->max_ip != r->min_ip) {
a.s_addr = r->max_ip;
printf("-%s", xtables_ipaddr_to_numeric(&a));
}
}
if (r->flags & NF_NAT_RANGE_PROTO_SPECIFIED) {
printf(" masq 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 (r->flags & NF_NAT_RANGE_PROTO_RANDOM)
printf(" random");
if (r->flags & NF_NAT_RANGE_PROTO_RANDOM_FULLY)
printf(" random-fully");
}
static void
FULLCONENAT_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_MAP_IPS) {
struct in_addr a;
a.s_addr = r->min_ip;
printf(" --to-source %s", xtables_ipaddr_to_numeric(&a));
if (r->max_ip != r->min_ip) {
a.s_addr = r->max_ip;
printf("-%s", xtables_ipaddr_to_numeric(&a));
}
}
if (r->flags & NF_NAT_RANGE_PROTO_SPECIFIED) {
printf(" --to-ports %hu", ntohs(r->min.tcp.port));
if (r->max.tcp.port != r->min.tcp.port)
printf("-%hu", ntohs(r->max.tcp.port));
}
if (r->flags & NF_NAT_RANGE_PROTO_RANDOM)
printf(" --random");
if (r->flags & NF_NAT_RANGE_PROTO_RANDOM_FULLY)
printf(" --random-fully");
}
static struct xtables_target fullconenat_tg_reg = {
.name = "FULLCONENAT",
.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 = FULLCONENAT_help,
.init = FULLCONENAT_init,
.x6_parse = FULLCONENAT_parse,
.print = FULLCONENAT_print,
.save = FULLCONENAT_save,
.x6_options = FULLCONENAT_opts,
};
void _init(void)
{
xtables_register_target(&fullconenat_tg_reg);
}
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