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#include <stdio.h>
#include <xtables.h>
#include <linux/netfilter/xt_cgroup.h>
enum {
O_CLASSID = 0,
O_PATH = 1,
};
static void cgroup_help_v0(void)
{
printf(
"cgroup match options:\n"
"[!] --cgroup classid Match cgroup classid\n");
}
static void cgroup_help_v1(void)
{
printf(
"cgroup match options:\n"
"[!] --path path Recursively match path relative to cgroup2 root\n"
"[!] --cgroup classid Match cgroup classid, can't be used with --path\n");
}
static const struct xt_option_entry cgroup_opts_v0[] = {
{
.name = "cgroup",
.id = O_CLASSID,
.type = XTTYPE_UINT32,
.flags = XTOPT_INVERT | XTOPT_MAND | XTOPT_PUT,
XTOPT_POINTER(struct xt_cgroup_info_v0, id)
},
XTOPT_TABLEEND,
};
static const struct xt_option_entry cgroup_opts_v1[] = {
{
.name = "path",
.id = O_PATH,
.type = XTTYPE_STRING,
.flags = XTOPT_INVERT | XTOPT_PUT,
XTOPT_POINTER(struct xt_cgroup_info_v1, path)
},
{
.name = "cgroup",
.id = O_CLASSID,
.type = XTTYPE_UINT32,
.flags = XTOPT_INVERT | XTOPT_PUT,
XTOPT_POINTER(struct xt_cgroup_info_v1, classid)
},
XTOPT_TABLEEND,
};
static void cgroup_parse_v0(struct xt_option_call *cb)
{
struct xt_cgroup_info_v0 *cgroupinfo = cb->data;
xtables_option_parse(cb);
if (cb->invert)
cgroupinfo->invert = true;
}
static void cgroup_parse_v1(struct xt_option_call *cb)
{
struct xt_cgroup_info_v1 *info = cb->data;
xtables_option_parse(cb);
switch (cb->entry->id) {
case O_PATH:
info->has_path = true;
if (cb->invert)
info->invert_path = true;
break;
case O_CLASSID:
info->has_classid = true;
if (cb->invert)
info->invert_classid = true;
break;
}
}
static void
cgroup_print_v0(const void *ip, const struct xt_entry_match *match, int numeric)
{
const struct xt_cgroup_info_v0 *info = (void *) match->data;
printf(" cgroup %s%u", info->invert ? "! ":"", info->id);
}
static void cgroup_save_v0(const void *ip, const struct xt_entry_match *match)
{
const struct xt_cgroup_info_v0 *info = (void *) match->data;
printf("%s --cgroup %u", info->invert ? " !" : "", info->id);
}
static void
cgroup_print_v1(const void *ip, const struct xt_entry_match *match, int numeric)
{
const struct xt_cgroup_info_v1 *info = (void *)match->data;
printf(" cgroup");
if (info->has_path)
printf(" %s%s", info->invert_path ? "! ":"", info->path);
if (info->has_classid)
printf(" %s%u", info->invert_classid ? "! ":"", info->classid);
}
static void cgroup_save_v1(const void *ip, const struct xt_entry_match *match)
{
const struct xt_cgroup_info_v1 *info = (void *)match->data;
if (info->has_path) {
printf("%s --path", info->invert_path ? " !" : "");
xtables_save_string(info->path);
}
if (info->has_classid)
printf("%s --cgroup %u", info->invert_classid ? " !" : "",
info->classid);
}
static int cgroup_xlate_v0(struct xt_xlate *xl,
const struct xt_xlate_mt_params *params)
{
const struct xt_cgroup_info_v0 *info = (void *)params->match->data;
xt_xlate_add(xl, "meta cgroup %s%u", info->invert ? "!= " : "",
info->id);
return 1;
}
static int cgroup_xlate_v1(struct xt_xlate *xl,
const struct xt_xlate_mt_params *params)
{
const struct xt_cgroup_info_v1 *info = (void *)params->match->data;
if (info->has_path)
return 0;
if (info->has_classid)
xt_xlate_add(xl, "meta cgroup %s%u",
info->invert_classid ? "!= " : "",
info->classid);
return 1;
}
static struct xtables_match cgroup_match[] = {
{
.family = NFPROTO_UNSPEC,
.revision = 0,
.name = "cgroup",
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_cgroup_info_v0)),
.userspacesize = XT_ALIGN(sizeof(struct xt_cgroup_info_v0)),
.help = cgroup_help_v0,
.print = cgroup_print_v0,
.save = cgroup_save_v0,
.x6_parse = cgroup_parse_v0,
.x6_options = cgroup_opts_v0,
.xlate = cgroup_xlate_v0,
},
{
.family = NFPROTO_UNSPEC,
.revision = 1,
.name = "cgroup",
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_cgroup_info_v1)),
.userspacesize = offsetof(struct xt_cgroup_info_v1, priv),
.help = cgroup_help_v1,
.print = cgroup_print_v1,
.save = cgroup_save_v1,
.x6_parse = cgroup_parse_v1,
.x6_options = cgroup_opts_v1,
.xlate = cgroup_xlate_v1,
},
};
void _init(void)
{
xtables_register_matches(cgroup_match, ARRAY_SIZE(cgroup_match));
}
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