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Add xt_PROTO extension

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Signed-off-by: Aron Xu <happyaron.xu@gmail.com>
This commit is contained in:
Miao Wang
2019-03-02 19:45:54 +08:00
committed by Aron Xu
parent ebcd176822
commit 266638e41e
3 changed files with 305 additions and 0 deletions
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113
extensions/libxt_PROTO.c Normal file
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@@ -0,0 +1,113 @@
/*
* PROTO Target module
* This program is distributed under the terms of GNU GPL
*/
#include <stdio.h>
#include <xtables.h>
#include "xt_PROTO.h"
enum {
O_PROTO_SET = 0,
O_PROTO_STOP_AT_FRAG = 1,
O_PROTO_STOP_AT_AUTH = 2,
F_PROTO_SET = 1 << O_PROTO_SET,
F_PROTO_STOP_AT_FRAG = 1 << O_PROTO_STOP_AT_FRAG,
F_PROTO_STOP_AT_AUTH = 1 << O_PROTO_STOP_AT_AUTH,
};
#define s struct xt_PROTO_info
static const struct xt_option_entry PROTO_opts[] = {
{.name = "proto-set", .type = XTTYPE_UINT8, .id = O_PROTO_SET,
.flags = XTOPT_PUT | XTOPT_MAND, XTOPT_POINTER(s, proto)},
{.name = "stop-at-frag", .type = XTTYPE_NONE, .id = O_PROTO_STOP_AT_FRAG},
{.name = "stop-at-auth", .type = XTTYPE_NONE, .id = O_PROTO_STOP_AT_AUTH},
XTOPT_TABLEEND,
};
#undef s
static void PROTO_help(void)
{
printf(
"PROTO target options\n"
" --proto-set value Set protocol to <value 0-255>\n"
);
}
static void PROTO_parse(struct xt_option_call *cb)
{
struct xt_PROTO_info *info = cb->data;
xtables_option_parse(cb);
switch (cb->entry->id) {
case O_PROTO_SET:
info->mode |= 1 << XT_PROTO_SET;
break;
case O_PROTO_STOP_AT_FRAG:
info->mode |= 1 << XT_PROTO_STOP_AT_FRAG;
break;
case O_PROTO_STOP_AT_AUTH:
info->mode |= 1 << XT_PROTO_STOP_AT_AUTH;
break;
}
}
static void PROTO_check(struct xt_fcheck_call *cb)
{
if (!(cb->xflags & F_PROTO_SET))
xtables_error(PARAMETER_PROBLEM,
"PROTO: You must specify the proto to be set");
}
static void PROTO_save(const void *ip, const struct xt_entry_target *target)
{
const struct xt_PROTO_info *info =
(struct xt_PROTO_info *) target->data;
if(info->mode & (1 << XT_PROTO_SET)){
printf(" --proto-set %u", info->proto);
}
if(info->mode & (1 << XT_PROTO_STOP_AT_FRAG)){
printf(" --stop-at-frag");
}
if(info->mode & (1 << XT_PROTO_STOP_AT_AUTH)){
printf(" --stop-at-auth");
}
}
static void PROTO_print(const void *ip, const struct xt_entry_target *target,
int numeric)
{
const struct xt_PROTO_info *info =
(struct xt_PROTO_info *) target->data;
printf(" PROTO ");
if(info->mode & (1 << XT_PROTO_SET)){
printf("set to %u", info->proto);
}
if(info->mode & (1 << XT_PROTO_STOP_AT_FRAG)){
printf(" stop-at-frag");
}
if(info->mode & (1 << XT_PROTO_STOP_AT_AUTH)){
printf(" stop-at-auth");
}
}
static struct xtables_target proto_tg_reg = {
.name = "PROTO",
.version = XTABLES_VERSION,
.family = NFPROTO_UNSPEC,
.size = XT_ALIGN(sizeof(struct xt_PROTO_info)),
.userspacesize = XT_ALIGN(sizeof(struct xt_PROTO_info)),
.help = PROTO_help,
.print = PROTO_print,
.save = PROTO_save,
.x6_parse = PROTO_parse,
.x6_fcheck = PROTO_check,
.x6_options = PROTO_opts,
};
static __attribute__((constructor)) void _init(void)
{
xtables_register_target(&proto_tg_reg);
}