obj/limit.c
/*
* Copyright (c) 2017 Pablo M. Bermudo Garay <pablombg@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <stdio.h>
#include <stdint.h>
#include <arpa/inet.h>
#include <errno.h>
#include <inttypes.h>
#include <linux/netfilter/nf_tables.h>
#include "internal.h"
#include <libmnl/libmnl.h>
#include <libnftnl/object.h>
#include "obj.h"
static int nftnl_obj_limit_set(struct nftnl_obj *e, uint16_t type,
const void *data, uint32_t data_len)
{
struct nftnl_obj_limit *limit = nftnl_obj_data(e);
switch (type) {
case NFTNL_OBJ_LIMIT_RATE:
memcpy(&limit->rate, data, sizeof(limit->rate));
break;
case NFTNL_OBJ_LIMIT_UNIT:
memcpy(&limit->unit, data, sizeof(limit->unit));
break;
case NFTNL_OBJ_LIMIT_BURST:
memcpy(&limit->burst, data, sizeof(limit->burst));
break;
case NFTNL_OBJ_LIMIT_TYPE:
memcpy(&limit->type, data, sizeof(limit->type));
break;
case NFTNL_OBJ_LIMIT_FLAGS:
memcpy(&limit->flags, data, sizeof(limit->flags));
break;
default:
return -1;
}
return 0;
}
static const void *nftnl_obj_limit_get(const struct nftnl_obj *e,
uint16_t type, uint32_t *data_len)
{
struct nftnl_obj_limit *limit = nftnl_obj_data(e);
switch (type) {
case NFTNL_OBJ_LIMIT_RATE:
*data_len = sizeof(limit->rate);
return &limit->rate;
case NFTNL_OBJ_LIMIT_UNIT:
*data_len = sizeof(limit->unit);
return &limit->unit;
case NFTNL_OBJ_LIMIT_BURST:
*data_len = sizeof(limit->burst);
return &limit->burst;
case NFTNL_OBJ_LIMIT_TYPE:
*data_len = sizeof(limit->type);
return &limit->type;
case NFTNL_OBJ_LIMIT_FLAGS:
*data_len = sizeof(limit->flags);
return &limit->flags;
}
return NULL;
}
static int nftnl_obj_limit_cb(const struct nlattr *attr, void *data)
{
int type = mnl_attr_get_type(attr);
const struct nlattr **tb = data;
if (mnl_attr_type_valid(attr, NFTA_LIMIT_MAX) < 0)
return MNL_CB_OK;
switch (type) {
case NFTA_LIMIT_RATE:
case NFTA_LIMIT_UNIT:
if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
abi_breakage();
break;
case NFTA_LIMIT_BURST:
case NFTA_LIMIT_TYPE:
case NFTA_LIMIT_FLAGS:
if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
abi_breakage();
break;
}
tb[type] = attr;
return MNL_CB_OK;
}
static void nftnl_obj_limit_build(struct nlmsghdr *nlh,
const struct nftnl_obj *e)
{
struct nftnl_obj_limit *limit = nftnl_obj_data(e);
if (e->flags & (1 << NFTNL_OBJ_LIMIT_RATE))
mnl_attr_put_u64(nlh, NFTA_LIMIT_RATE, htobe64(limit->rate));
if (e->flags & (1 << NFTNL_OBJ_LIMIT_UNIT))
mnl_attr_put_u64(nlh, NFTA_LIMIT_UNIT, htobe64(limit->unit));
if (e->flags & (1 << NFTNL_OBJ_LIMIT_BURST))
mnl_attr_put_u32(nlh, NFTA_LIMIT_BURST, htonl(limit->burst));
if (e->flags & (1 << NFTNL_OBJ_LIMIT_TYPE))
mnl_attr_put_u32(nlh, NFTA_LIMIT_TYPE, htonl(limit->type));
if (e->flags & (1 << NFTNL_OBJ_LIMIT_FLAGS))
mnl_attr_put_u32(nlh, NFTA_LIMIT_FLAGS, htonl(limit->flags));
}
static int nftnl_obj_limit_parse(struct nftnl_obj *e, struct nlattr *attr)
{
struct nftnl_obj_limit *limit = nftnl_obj_data(e);
struct nlattr *tb[NFTA_LIMIT_MAX + 1] = {};
if (mnl_attr_parse_nested(attr, nftnl_obj_limit_cb, tb) < 0)
return -1;
if (tb[NFTA_LIMIT_RATE]) {
limit->rate = be64toh(mnl_attr_get_u64(tb[NFTA_LIMIT_RATE]));
e->flags |= (1 << NFTNL_OBJ_LIMIT_RATE);
}
if (tb[NFTA_LIMIT_UNIT]) {
limit->unit = be64toh(mnl_attr_get_u64(tb[NFTA_LIMIT_UNIT]));
e->flags |= (1 << NFTNL_OBJ_LIMIT_UNIT);
}
if (tb[NFTA_LIMIT_BURST]) {
limit->burst = ntohl(mnl_attr_get_u32(tb[NFTA_LIMIT_BURST]));
e->flags |= (1 << NFTNL_OBJ_LIMIT_BURST);
}
if (tb[NFTA_LIMIT_TYPE]) {
limit->type = ntohl(mnl_attr_get_u32(tb[NFTA_LIMIT_TYPE]));
e->flags |= (1 << NFTNL_OBJ_LIMIT_TYPE);
}
if (tb[NFTA_LIMIT_FLAGS]) {
limit->flags = ntohl(mnl_attr_get_u32(tb[NFTA_LIMIT_FLAGS]));
e->flags |= (1 << NFTNL_OBJ_LIMIT_FLAGS);
}
return 0;
}
static int nftnl_obj_limit_snprintf_default(char *buf, size_t len,
const struct nftnl_obj *e)
{
struct nftnl_obj_limit *limit = nftnl_obj_data(e);
return snprintf(buf, len, "rate %"PRIu64" unit %"PRIu64" burst %u "
"type %u flags %u ", limit->rate, limit->unit,
limit->burst, limit->type, limit->flags);
}
static int nftnl_obj_limit_snprintf(char *buf, size_t len, uint32_t type,
uint32_t flags,
const struct nftnl_obj *e)
{
if (len)
buf[0] = '\0';
switch (type) {
case NFTNL_OUTPUT_DEFAULT:
return nftnl_obj_limit_snprintf_default(buf, len, e);
case NFTNL_OUTPUT_XML:
case NFTNL_OUTPUT_JSON:
default:
break;
}
return -1;
}
struct obj_ops obj_ops_limit = {
.name = "limit",
.type = NFT_OBJECT_LIMIT,
.alloc_len = sizeof(struct nftnl_obj_limit),
.max_attr = NFTA_LIMIT_MAX,
.set = nftnl_obj_limit_set,
.get = nftnl_obj_limit_get,
.parse = nftnl_obj_limit_parse,
.build = nftnl_obj_limit_build,
.snprintf = nftnl_obj_limit_snprintf,
};