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/* Shared library add-on to iptables to add IP range matching support. */
#include <stdio.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <netinet/in.h>
#include <xtables.h>
#include <linux/netfilter.h>
#include <linux/netfilter/xt_iprange.h>
#include <linux/netfilter_ipv4/ipt_iprange.h>
enum {
F_SRCIP = 1 << 0,
F_DSTIP = 1 << 1,
};
static void iprange_mt_help(void)
{
printf(
"iprange match options:\n"
"[!] --src-range ip-ip Match source IP in the specified range\n"
"[!] --dst-range ip-ip Match destination IP in the specified range\n");
}
static const struct option iprange_mt_opts[] = {
{.name = "src-range", .has_arg = true, .val = '1'},
{.name = "dst-range", .has_arg = true, .val = '2'},
{ .name = NULL }
};
static void
parse_iprange(char *arg, struct ipt_iprange *range)
{
char *dash;
const struct in_addr *ip;
dash = strchr(arg, '-');
if (dash != NULL)
*dash = '\0';
ip = xtables_numeric_to_ipaddr(arg);
if (!ip)
xtables_error(PARAMETER_PROBLEM, "iprange match: Bad IP address \"%s\"\n",
arg);
range->min_ip = ip->s_addr;
if (dash != NULL) {
ip = xtables_numeric_to_ipaddr(dash+1);
if (!ip)
xtables_error(PARAMETER_PROBLEM, "iprange match: Bad IP address \"%s\"\n",
dash+1);
range->max_ip = ip->s_addr;
} else {
range->max_ip = range->min_ip;
}
}
static int iprange_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_match **match)
{
struct ipt_iprange_info *info = (struct ipt_iprange_info *)(*match)->data;
switch (c) {
case '1':
if (*flags & IPRANGE_SRC)
xtables_error(PARAMETER_PROBLEM,
"iprange match: Only use --src-range ONCE!");
*flags |= IPRANGE_SRC;
info->flags |= IPRANGE_SRC;
xtables_check_inverse(optarg, &invert, &optind, 0);
if (invert)
info->flags |= IPRANGE_SRC_INV;
parse_iprange(optarg, &info->src);
break;
case '2':
if (*flags & IPRANGE_DST)
xtables_error(PARAMETER_PROBLEM,
"iprange match: Only use --dst-range ONCE!");
*flags |= IPRANGE_DST;
info->flags |= IPRANGE_DST;
xtables_check_inverse(optarg, &invert, &optind, 0);
if (invert)
info->flags |= IPRANGE_DST_INV;
parse_iprange(optarg, &info->dst);
break;
default:
return 0;
}
return 1;
}
static int
iprange_mt4_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_match **match)
{
struct xt_iprange_mtinfo *info = (void *)(*match)->data;
const struct in_addr *ia;
char *end;
switch (c) {
case '1': /* --src-range */
end = strchr(optarg, '-');
if (end == NULL)
xtables_param_act(XTF_BAD_VALUE, "iprange", "--src-range", optarg);
*end = '\0';
ia = xtables_numeric_to_ipaddr(optarg);
if (ia == NULL)
xtables_param_act(XTF_BAD_VALUE, "iprange", "--src-range", optarg);
memcpy(&info->src_min.in, ia, sizeof(*ia));
ia = xtables_numeric_to_ipaddr(end+1);
if (ia == NULL)
xtables_param_act(XTF_BAD_VALUE, "iprange", "--src-range", end + 1);
memcpy(&info->src_max.in, ia, sizeof(*ia));
info->flags |= IPRANGE_SRC;
if (invert)
info->flags |= IPRANGE_SRC_INV;
*flags |= F_SRCIP;
return true;
case '2': /* --dst-range */
end = strchr(optarg, '-');
if (end == NULL)
xtables_param_act(XTF_BAD_VALUE, "iprange", "--dst-range", optarg);
*end = '\0';
ia = xtables_numeric_to_ipaddr(optarg);
if (ia == NULL)
xtables_param_act(XTF_BAD_VALUE, "iprange", "--dst-range", optarg);
memcpy(&info->dst_min.in, ia, sizeof(*ia));
ia = xtables_numeric_to_ipaddr(end + 1);
if (ia == NULL)
xtables_param_act(XTF_BAD_VALUE, "iprange", "--dst-range", end + 1);
memcpy(&info->dst_max.in, ia, sizeof(*ia));
info->flags |= IPRANGE_DST;
if (invert)
info->flags |= IPRANGE_DST_INV;
*flags |= F_DSTIP;
return true;
}
return false;
}
static int
iprange_mt6_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_match **match)
{
struct xt_iprange_mtinfo *info = (void *)(*match)->data;
const struct in6_addr *ia;
char *end;
switch (c) {
case '1': /* --src-range */
end = strchr(optarg, '-');
if (end == NULL)
xtables_param_act(XTF_BAD_VALUE, "iprange", "--src-range", optarg);
*end = '\0';
ia = xtables_numeric_to_ip6addr(optarg);
if (ia == NULL)
xtables_param_act(XTF_BAD_VALUE, "iprange", "--src-range", optarg);
memcpy(&info->src_min.in, ia, sizeof(*ia));
ia = xtables_numeric_to_ip6addr(end+1);
if (ia == NULL)
xtables_param_act(XTF_BAD_VALUE, "iprange", "--src-range", end + 1);
memcpy(&info->src_max.in, ia, sizeof(*ia));
info->flags |= IPRANGE_SRC;
if (invert)
info->flags |= IPRANGE_SRC_INV;
*flags |= F_SRCIP;
return true;
case '2': /* --dst-range */
end = strchr(optarg, '-');
if (end == NULL)
xtables_param_act(XTF_BAD_VALUE, "iprange", "--dst-range", optarg);
*end = '\0';
ia = xtables_numeric_to_ip6addr(optarg);
if (ia == NULL)
xtables_param_act(XTF_BAD_VALUE, "iprange", "--dst-range", optarg);
memcpy(&info->dst_min.in, ia, sizeof(*ia));
ia = xtables_numeric_to_ip6addr(end + 1);
if (ia == NULL)
xtables_param_act(XTF_BAD_VALUE, "iprange", "--dst-range", end + 1);
memcpy(&info->dst_max.in, ia, sizeof(*ia));
info->flags |= IPRANGE_DST;
if (invert)
info->flags |= IPRANGE_DST_INV;
*flags |= F_DSTIP;
return true;
}
return false;
}
static void iprange_mt_check(unsigned int flags)
{
if (flags == 0)
xtables_error(PARAMETER_PROBLEM,
"iprange match: You must specify `--src-range' or `--dst-range'");
}
static void
print_iprange(const struct ipt_iprange *range)
{
const unsigned char *byte_min, *byte_max;
byte_min = (const unsigned char *)&range->min_ip;
byte_max = (const unsigned char *)&range->max_ip;
printf("%u.%u.%u.%u-%u.%u.%u.%u ",
byte_min[0], byte_min[1], byte_min[2], byte_min[3],
byte_max[0], byte_max[1], byte_max[2], byte_max[3]);
}
static void iprange_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
const struct ipt_iprange_info *info = (const void *)match->data;
if (info->flags & IPRANGE_SRC) {
printf("source IP range ");
if (info->flags & IPRANGE_SRC_INV)
printf("! ");
print_iprange(&info->src);
}
if (info->flags & IPRANGE_DST) {
printf("destination IP range ");
if (info->flags & IPRANGE_DST_INV)
printf("! ");
print_iprange(&info->dst);
}
}
static void
iprange_mt4_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
const struct xt_iprange_mtinfo *info = (const void *)match->data;
if (info->flags & IPRANGE_SRC) {
printf("source IP range ");
if (info->flags & IPRANGE_SRC_INV)
printf("! ");
/*
* ipaddr_to_numeric() uses a static buffer, so cannot
* combine the printf() calls.
*/
printf("%s", xtables_ipaddr_to_numeric(&info->src_min.in));
printf("-%s ", xtables_ipaddr_to_numeric(&info->src_max.in));
}
if (info->flags & IPRANGE_DST) {
printf("destination IP range ");
if (info->flags & IPRANGE_DST_INV)
printf("! ");
printf("%s", xtables_ipaddr_to_numeric(&info->dst_min.in));
printf("-%s ", xtables_ipaddr_to_numeric(&info->dst_max.in));
}
}
static void
iprange_mt6_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
const struct xt_iprange_mtinfo *info = (const void *)match->data;
if (info->flags & IPRANGE_SRC) {
printf("source IP range ");
if (info->flags & IPRANGE_SRC_INV)
printf("! ");
/*
* ipaddr_to_numeric() uses a static buffer, so cannot
* combine the printf() calls.
*/
printf("%s", xtables_ip6addr_to_numeric(&info->src_min.in6));
printf("-%s ", xtables_ip6addr_to_numeric(&info->src_max.in6));
}
if (info->flags & IPRANGE_DST) {
printf("destination IP range ");
if (info->flags & IPRANGE_DST_INV)
printf("! ");
printf("%s", xtables_ip6addr_to_numeric(&info->dst_min.in6));
printf("-%s ", xtables_ip6addr_to_numeric(&info->dst_max.in6));
}
}
static void iprange_save(const void *ip, const struct xt_entry_match *match)
{
const struct ipt_iprange_info *info = (const void *)match->data;
if (info->flags & IPRANGE_SRC) {
if (info->flags & IPRANGE_SRC_INV)
printf("! ");
printf("--src-range ");
print_iprange(&info->src);
if (info->flags & IPRANGE_DST)
fputc(' ', stdout);
}
if (info->flags & IPRANGE_DST) {
if (info->flags & IPRANGE_DST_INV)
printf("! ");
printf("--dst-range ");
print_iprange(&info->dst);
}
}
static void iprange_mt4_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_iprange_mtinfo *info = (const void *)match->data;
if (info->flags & IPRANGE_SRC) {
if (info->flags & IPRANGE_SRC_INV)
printf("! ");
printf("--src-range %s", xtables_ipaddr_to_numeric(&info->src_min.in));
printf("-%s ", xtables_ipaddr_to_numeric(&info->src_max.in));
}
if (info->flags & IPRANGE_DST) {
if (info->flags & IPRANGE_DST_INV)
printf("! ");
printf("--dst-range %s", xtables_ipaddr_to_numeric(&info->dst_min.in));
printf("-%s ", xtables_ipaddr_to_numeric(&info->dst_max.in));
}
}
static void iprange_mt6_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_iprange_mtinfo *info = (const void *)match->data;
if (info->flags & IPRANGE_SRC) {
if (info->flags & IPRANGE_SRC_INV)
printf("! ");
printf("--src-range %s", xtables_ip6addr_to_numeric(&info->src_min.in6));
printf("-%s ", xtables_ip6addr_to_numeric(&info->src_max.in6));
}
if (info->flags & IPRANGE_DST) {
if (info->flags & IPRANGE_DST_INV)
printf("! ");
printf("--dst-range %s", xtables_ip6addr_to_numeric(&info->dst_min.in6));
printf("-%s ", xtables_ip6addr_to_numeric(&info->dst_max.in6));
}
}
static struct xtables_match iprange_match = {
.version = XTABLES_VERSION,
.name = "iprange",
.revision = 0,
.family = NFPROTO_IPV4,
.size = XT_ALIGN(sizeof(struct ipt_iprange_info)),
.userspacesize = XT_ALIGN(sizeof(struct ipt_iprange_info)),
.help = iprange_mt_help,
.parse = iprange_parse,
.final_check = iprange_mt_check,
.print = iprange_print,
.save = iprange_save,
.extra_opts = iprange_mt_opts,
};
static struct xtables_match iprange_mt_reg = {
.version = XTABLES_VERSION,
.name = "iprange",
.revision = 1,
.family = NFPROTO_IPV4,
.size = XT_ALIGN(sizeof(struct xt_iprange_mtinfo)),
.userspacesize = XT_ALIGN(sizeof(struct xt_iprange_mtinfo)),
.help = iprange_mt_help,
.parse = iprange_mt4_parse,
.final_check = iprange_mt_check,
.print = iprange_mt4_print,
.save = iprange_mt4_save,
.extra_opts = iprange_mt_opts,
};
static struct xtables_match iprange_mt6_reg = {
.version = XTABLES_VERSION,
.name = "iprange",
.revision = 1,
.family = NFPROTO_IPV6,
.size = XT_ALIGN(sizeof(struct xt_iprange_mtinfo)),
.userspacesize = XT_ALIGN(sizeof(struct xt_iprange_mtinfo)),
.help = iprange_mt_help,
.parse = iprange_mt6_parse,
.final_check = iprange_mt_check,
.print = iprange_mt6_print,
.save = iprange_mt6_save,
.extra_opts = iprange_mt_opts,
};
void _init(void)
{
xtables_register_match(&iprange_match);
xtables_register_match(&iprange_mt_reg);
xtables_register_match(&iprange_mt6_reg);
}
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