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/* Shared library add-on to iptables to add NFMARK matching support. */
#include <stdbool.h>
#include <stdio.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <xtables.h>
#include <linux/netfilter/xt_mark.h>
struct xt_mark_info {
unsigned long mark, mask;
uint8_t invert;
};
enum {
F_MARK = 1 << 0,
};
static void mark_mt_help(void)
{
printf(
"mark match options:\n"
"[!] --mark value[/mask] Match nfmark value with optional mask\n");
}
static const struct option mark_mt_opts[] = {
{.name = "mark", .has_arg = true, .val = '1'},
XT_GETOPT_TABLEEND,
};
static int mark_mt_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_match **match)
{
struct xt_mark_mtinfo1 *info = (void *)(*match)->data;
unsigned int mark, mask = UINT32_MAX;
char *end;
switch (c) {
case '1': /* --mark */
xtables_param_act(XTF_ONLY_ONCE, "mark", "--mark", *flags & F_MARK);
if (!xtables_strtoui(optarg, &end, &mark, 0, UINT32_MAX))
xtables_param_act(XTF_BAD_VALUE, "mark", "--mark", optarg);
if (*end == '/')
if (!xtables_strtoui(end + 1, &end, &mask, 0, UINT32_MAX))
xtables_param_act(XTF_BAD_VALUE, "mark", "--mark", optarg);
if (*end != '\0')
xtables_param_act(XTF_BAD_VALUE, "mark", "--mark", optarg);
if (invert)
info->invert = true;
info->mark = mark;
info->mask = mask;
*flags |= F_MARK;
return true;
}
return false;
}
static int
mark_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_match **match)
{
struct xt_mark_info *markinfo = (struct xt_mark_info *)(*match)->data;
switch (c) {
char *end;
case '1':
xtables_check_inverse(optarg, &invert, &optind, 0, argv);
markinfo->mark = strtoul(optarg, &end, 0);
if (*end == '/') {
markinfo->mask = strtoul(end+1, &end, 0);
} else
markinfo->mask = 0xffffffff;
if (*end != '\0' || end == optarg)
xtables_error(PARAMETER_PROBLEM, "Bad MARK value \"%s\"", optarg);
if (invert)
markinfo->invert = 1;
*flags = 1;
break;
}
return 1;
}
static void print_mark(unsigned int mark, unsigned int mask)
{
if (mask != 0xffffffffU)
printf("0x%x/0x%x ", mark, mask);
else
printf("0x%x ", mark);
}
static void mark_mt_check(unsigned int flags)
{
if (flags == 0)
xtables_error(PARAMETER_PROBLEM,
"mark match: The --mark option is required");
}
static void
mark_mt_print(const void *ip, const struct xt_entry_match *match, int numeric)
{
const struct xt_mark_mtinfo1 *info = (const void *)match->data;
printf("mark match ");
if (info->invert)
printf("!");
print_mark(info->mark, info->mask);
}
static void
mark_print(const void *ip, const struct xt_entry_match *match, int numeric)
{
const struct xt_mark_info *info = (const void *)match->data;
printf("MARK match ");
if (info->invert)
printf("!");
print_mark(info->mark, info->mask);
}
static void mark_mt_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_mark_mtinfo1 *info = (const void *)match->data;
if (info->invert)
printf("! ");
printf("--mark ");
print_mark(info->mark, info->mask);
}
static void
mark_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_mark_info *info = (const void *)match->data;
if (info->invert)
printf("! ");
printf("--mark ");
print_mark(info->mark, info->mask);
}
static struct xtables_match mark_mt_reg[] = {
{
.family = NFPROTO_UNSPEC,
.name = "mark",
.revision = 0,
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_mark_info)),
.userspacesize = XT_ALIGN(sizeof(struct xt_mark_info)),
.help = mark_mt_help,
.parse = mark_parse,
.final_check = mark_mt_check,
.print = mark_print,
.save = mark_save,
.extra_opts = mark_mt_opts,
},
{
.version = XTABLES_VERSION,
.name = "mark",
.revision = 1,
.family = NFPROTO_UNSPEC,
.size = XT_ALIGN(sizeof(struct xt_mark_mtinfo1)),
.userspacesize = XT_ALIGN(sizeof(struct xt_mark_mtinfo1)),
.help = mark_mt_help,
.parse = mark_mt_parse,
.final_check = mark_mt_check,
.print = mark_mt_print,
.save = mark_mt_save,
.extra_opts = mark_mt_opts,
},
};
void _init(void)
{
xtables_register_matches(mark_mt_reg, ARRAY_SIZE(mark_mt_reg));
}
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