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/* Shared library add-on to iptables to add addrtype matching support
*
* This program is released under the terms of GNU GPL */
#include <stdio.h>
#include <string.h>
#include <xtables.h>
#include <linux/netfilter_ipv4/ipt_addrtype.h>
enum {
O_SRC_TYPE = 0,
O_DST_TYPE,
O_LIMIT_IFACE_IN,
O_LIMIT_IFACE_OUT,
F_SRC_TYPE = 1 << O_SRC_TYPE,
F_DST_TYPE = 1 << O_DST_TYPE,
F_LIMIT_IFACE_IN = 1 << O_LIMIT_IFACE_IN,
F_LIMIT_IFACE_OUT = 1 << O_LIMIT_IFACE_OUT,
};
/* from linux/rtnetlink.h, must match order of enumeration */
static const char *const rtn_names[] = {
"UNSPEC",
"UNICAST",
"LOCAL",
"BROADCAST",
"ANYCAST",
"MULTICAST",
"BLACKHOLE",
"UNREACHABLE",
"PROHIBIT",
"THROW",
"NAT",
"XRESOLVE",
NULL
};
static void addrtype_help_types(void)
{
int i;
for (i = 0; rtn_names[i]; i++)
printf(" %s\n", rtn_names[i]);
}
static void addrtype_help_v0(void)
{
printf(
"Address type match options:\n"
" [!] --src-type type[,...] Match source address type\n"
" [!] --dst-type type[,...] Match destination address type\n"
"\n"
"Valid types: \n");
addrtype_help_types();
}
static void addrtype_help_v1(void)
{
printf(
"Address type match options:\n"
" [!] --src-type type[,...] Match source address type\n"
" [!] --dst-type type[,...] Match destination address type\n"
" --limit-iface-in Match only on the packet's incoming device\n"
" --limit-iface-out Match only on the packet's incoming device\n"
"\n"
"Valid types: \n");
addrtype_help_types();
}
static int
parse_type(const char *name, size_t len, uint16_t *mask)
{
int i;
for (i = 0; rtn_names[i]; i++)
if (strncasecmp(name, rtn_names[i], len) == 0) {
/* build up bitmask for kernel module */
*mask |= (1 << i);
return 1;
}
return 0;
}
static void parse_types(const char *arg, uint16_t *mask)
{
const char *comma;
while ((comma = strchr(arg, ',')) != NULL) {
if (comma == arg || !parse_type(arg, comma-arg, mask))
xtables_error(PARAMETER_PROBLEM,
"addrtype: bad type `%s'", arg);
arg = comma + 1;
}
if (strlen(arg) == 0 || !parse_type(arg, strlen(arg), mask))
xtables_error(PARAMETER_PROBLEM, "addrtype: bad type \"%s\"", arg);
}
static void addrtype_parse_v0(struct xt_option_call *cb)
{
struct ipt_addrtype_info *info = cb->data;
xtables_option_parse(cb);
switch (cb->entry->id) {
case O_SRC_TYPE:
parse_types(cb->arg, &info->source);
if (cb->invert)
info->invert_source = 1;
break;
case O_DST_TYPE:
parse_types(cb->arg, &info->dest);
if (cb->invert)
info->invert_dest = 1;
break;
}
}
static void addrtype_parse_v1(struct xt_option_call *cb)
{
struct ipt_addrtype_info_v1 *info = cb->data;
xtables_option_parse(cb);
switch (cb->entry->id) {
case O_SRC_TYPE:
parse_types(cb->arg, &info->source);
if (cb->invert)
info->flags |= IPT_ADDRTYPE_INVERT_SOURCE;
break;
case O_DST_TYPE:
parse_types(cb->arg, &info->dest);
if (cb->invert)
info->flags |= IPT_ADDRTYPE_INVERT_DEST;
break;
case O_LIMIT_IFACE_IN:
info->flags |= IPT_ADDRTYPE_LIMIT_IFACE_IN;
break;
case O_LIMIT_IFACE_OUT:
info->flags |= IPT_ADDRTYPE_LIMIT_IFACE_OUT;
break;
}
}
static void addrtype_check(struct xt_fcheck_call *cb)
{
if (!(cb->xflags & (F_SRC_TYPE | F_DST_TYPE)))
xtables_error(PARAMETER_PROBLEM,
"addrtype: you must specify --src-type or --dst-type");
}
static void print_types(uint16_t mask)
{
const char *sep = "";
int i;
for (i = 0; rtn_names[i]; i++)
if (mask & (1 << i)) {
printf("%s%s", sep, rtn_names[i]);
sep = ",";
}
}
static void addrtype_print_v0(const void *ip, const struct xt_entry_match *match,
int numeric)
{
const struct ipt_addrtype_info *info =
(struct ipt_addrtype_info *) match->data;
printf(" ADDRTYPE match");
if (info->source) {
printf(" src-type ");
if (info->invert_source)
printf("!");
print_types(info->source);
}
if (info->dest) {
printf(" dst-type");
if (info->invert_dest)
printf("!");
print_types(info->dest);
}
}
static void addrtype_print_v1(const void *ip, const struct xt_entry_match *match,
int numeric)
{
const struct ipt_addrtype_info_v1 *info =
(struct ipt_addrtype_info_v1 *) match->data;
printf(" ADDRTYPE match");
if (info->source) {
printf(" src-type ");
if (info->flags & IPT_ADDRTYPE_INVERT_SOURCE)
printf("!");
print_types(info->source);
}
if (info->dest) {
printf(" dst-type ");
if (info->flags & IPT_ADDRTYPE_INVERT_DEST)
printf("!");
print_types(info->dest);
}
if (info->flags & IPT_ADDRTYPE_LIMIT_IFACE_IN) {
printf(" limit-in");
}
if (info->flags & IPT_ADDRTYPE_LIMIT_IFACE_OUT) {
printf(" limit-out");
}
}
static void addrtype_save_v0(const void *ip, const struct xt_entry_match *match)
{
const struct ipt_addrtype_info *info =
(struct ipt_addrtype_info *) match->data;
if (info->source) {
if (info->invert_source)
printf(" !");
printf(" --src-type ");
print_types(info->source);
}
if (info->dest) {
if (info->invert_dest)
printf(" !");
printf(" --dst-type ");
print_types(info->dest);
}
}
static void addrtype_save_v1(const void *ip, const struct xt_entry_match *match)
{
const struct ipt_addrtype_info_v1 *info =
(struct ipt_addrtype_info_v1 *) match->data;
if (info->source) {
if (info->flags & IPT_ADDRTYPE_INVERT_SOURCE)
printf(" !");
printf(" --src-type ");
print_types(info->source);
}
if (info->dest) {
if (info->flags & IPT_ADDRTYPE_INVERT_DEST)
printf(" !");
printf(" --dst-type ");
print_types(info->dest);
}
if (info->flags & IPT_ADDRTYPE_LIMIT_IFACE_IN) {
printf(" --limit-iface-in");
}
if (info->flags & IPT_ADDRTYPE_LIMIT_IFACE_OUT) {
printf(" --limit-iface-out");
}
}
static const struct xt_option_entry addrtype_opts_v0[] = {
{.name = "src-type", .id = O_SRC_TYPE, .type = XTTYPE_STRING,
.flags = XTOPT_INVERT},
{.name = "dst-type", .id = O_DST_TYPE, .type = XTTYPE_STRING,
.flags = XTOPT_INVERT},
XTOPT_TABLEEND,
};
static const struct xt_option_entry addrtype_opts_v1[] = {
{.name = "src-type", .id = O_SRC_TYPE, .type = XTTYPE_STRING,
.flags = XTOPT_INVERT},
{.name = "dst-type", .id = O_DST_TYPE, .type = XTTYPE_STRING,
.flags = XTOPT_INVERT},
{.name = "limit-iface-in", .id = O_LIMIT_IFACE_IN,
.type = XTTYPE_NONE, .excl = F_LIMIT_IFACE_OUT},
{.name = "limit-iface-out", .id = O_LIMIT_IFACE_OUT,
.type = XTTYPE_NONE, .excl = F_LIMIT_IFACE_IN},
XTOPT_TABLEEND,
};
static struct xtables_match addrtype_mt_reg[] = {
{
.name = "addrtype",
.version = XTABLES_VERSION,
.family = NFPROTO_IPV4,
.size = XT_ALIGN(sizeof(struct ipt_addrtype_info)),
.userspacesize = XT_ALIGN(sizeof(struct ipt_addrtype_info)),
.help = addrtype_help_v0,
.print = addrtype_print_v0,
.save = addrtype_save_v0,
.x6_parse = addrtype_parse_v0,
.x6_fcheck = addrtype_check,
.x6_options = addrtype_opts_v0,
},
{
.name = "addrtype",
.revision = 1,
.version = XTABLES_VERSION,
.family = NFPROTO_IPV4,
.size = XT_ALIGN(sizeof(struct ipt_addrtype_info_v1)),
.userspacesize = XT_ALIGN(sizeof(struct ipt_addrtype_info_v1)),
.help = addrtype_help_v1,
.print = addrtype_print_v1,
.save = addrtype_save_v1,
.x6_parse = addrtype_parse_v1,
.x6_fcheck = addrtype_check,
.x6_options = addrtype_opts_v1,
},
};
void _init(void)
{
xtables_register_matches(addrtype_mt_reg, ARRAY_SIZE(addrtype_mt_reg));
}
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