object.c
/*
* (C) 2012-2016 by Pablo Neira Ayuso <pablo@netfilter.org>
*
* 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 "internal.h"
#include <time.h>
#include <endian.h>
#include <stdint.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <netinet/in.h>
#include <errno.h>
#include <libmnl/libmnl.h>
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nf_tables.h>
#include <libnftnl/object.h>
#include "obj.h"
static struct obj_ops *obj_ops[__NFT_OBJECT_MAX] = {
[NFT_OBJECT_COUNTER] = &obj_ops_counter,
[NFT_OBJECT_QUOTA] = &obj_ops_quota,
[NFT_OBJECT_CT_HELPER] = &obj_ops_ct_helper,
[NFT_OBJECT_LIMIT] = &obj_ops_limit,
[NFT_OBJECT_TUNNEL] = &obj_ops_tunnel,
[NFT_OBJECT_CT_TIMEOUT] = &obj_ops_ct_timeout,
[NFT_OBJECT_SECMARK] = &obj_ops_secmark,
[NFT_OBJECT_CT_EXPECT] = &obj_ops_ct_expect,
[NFT_OBJECT_SYNPROXY] = &obj_ops_synproxy,
};
static struct obj_ops *nftnl_obj_ops_lookup(uint32_t type)
{
if (type > NFT_OBJECT_MAX)
return NULL;
return obj_ops[type];
}
EXPORT_SYMBOL(nftnl_obj_alloc);
struct nftnl_obj *nftnl_obj_alloc(void)
{
return calloc(1, sizeof(struct nftnl_obj));
}
EXPORT_SYMBOL(nftnl_obj_free);
void nftnl_obj_free(const struct nftnl_obj *obj)
{
if (obj->flags & (1 << NFTNL_OBJ_TABLE))
xfree(obj->table);
if (obj->flags & (1 << NFTNL_OBJ_NAME))
xfree(obj->name);
if (obj->flags & (1 << NFTNL_OBJ_USERDATA))
xfree(obj->user.data);
xfree(obj);
}
EXPORT_SYMBOL(nftnl_obj_is_set);
bool nftnl_obj_is_set(const struct nftnl_obj *obj, uint16_t attr)
{
return obj->flags & (1 << attr);
}
static uint32_t nftnl_obj_validate[NFTNL_OBJ_MAX + 1] = {
[NFTNL_OBJ_FAMILY] = sizeof(uint32_t),
[NFTNL_OBJ_USE] = sizeof(uint32_t),
[NFTNL_OBJ_HANDLE] = sizeof(uint64_t),
};
EXPORT_SYMBOL(nftnl_obj_set_data);
void nftnl_obj_set_data(struct nftnl_obj *obj, uint16_t attr,
const void *data, uint32_t data_len)
{
if (attr < NFTNL_OBJ_MAX)
nftnl_assert_validate(data, nftnl_obj_validate, attr, data_len);
switch (attr) {
case NFTNL_OBJ_TABLE:
xfree(obj->table);
obj->table = strdup(data);
break;
case NFTNL_OBJ_NAME:
xfree(obj->name);
obj->name = strdup(data);
break;
case NFTNL_OBJ_TYPE:
obj->ops = nftnl_obj_ops_lookup(*((uint32_t *)data));
if (!obj->ops)
return;
break;
case NFTNL_OBJ_FAMILY:
memcpy(&obj->family, data, sizeof(obj->family));
break;
case NFTNL_OBJ_USE:
memcpy(&obj->use, data, sizeof(obj->use));
break;
case NFTNL_OBJ_HANDLE:
memcpy(&obj->handle, data, sizeof(obj->handle));
break;
case NFTNL_OBJ_USERDATA:
if (obj->flags & (1 << NFTNL_OBJ_USERDATA))
xfree(obj->user.data);
obj->user.data = malloc(data_len);
if (!obj->user.data)
return;
memcpy(obj->user.data, data, data_len);
obj->user.len = data_len;
break;
default:
if (obj->ops)
obj->ops->set(obj, attr, data, data_len);
break;
}
obj->flags |= (1 << attr);
}
void nftnl_obj_set(struct nftnl_obj *obj, uint16_t attr, const void *data) __visible;
void nftnl_obj_set(struct nftnl_obj *obj, uint16_t attr, const void *data)
{
nftnl_obj_set_data(obj, attr, data, nftnl_obj_validate[attr]);
}
EXPORT_SYMBOL(nftnl_obj_set_u8);
void nftnl_obj_set_u8(struct nftnl_obj *obj, uint16_t attr, uint8_t val)
{
nftnl_obj_set_data(obj, attr, &val, sizeof(uint8_t));
}
EXPORT_SYMBOL(nftnl_obj_set_u16);
void nftnl_obj_set_u16(struct nftnl_obj *obj, uint16_t attr, uint16_t val)
{
nftnl_obj_set_data(obj, attr, &val, sizeof(uint16_t));
}
EXPORT_SYMBOL(nftnl_obj_set_u32);
void nftnl_obj_set_u32(struct nftnl_obj *obj, uint16_t attr, uint32_t val)
{
nftnl_obj_set_data(obj, attr, &val, sizeof(uint32_t));
}
EXPORT_SYMBOL(nftnl_obj_set_u64);
void nftnl_obj_set_u64(struct nftnl_obj *obj, uint16_t attr, uint64_t val)
{
nftnl_obj_set_data(obj, attr, &val, sizeof(uint64_t));
}
EXPORT_SYMBOL(nftnl_obj_set_str);
void nftnl_obj_set_str(struct nftnl_obj *obj, uint16_t attr, const char *str)
{
nftnl_obj_set_data(obj, attr, str, 0);
}
EXPORT_SYMBOL(nftnl_obj_get_data);
const void *nftnl_obj_get_data(struct nftnl_obj *obj, uint16_t attr,
uint32_t *data_len)
{
if (!(obj->flags & (1 << attr)))
return NULL;
switch(attr) {
case NFTNL_OBJ_TABLE:
return obj->table;
case NFTNL_OBJ_NAME:
return obj->name;
case NFTNL_OBJ_TYPE:
if (!obj->ops)
return NULL;
*data_len = sizeof(uint32_t);
return &obj->ops->type;
case NFTNL_OBJ_FAMILY:
*data_len = sizeof(uint32_t);
return &obj->family;
case NFTNL_OBJ_USE:
*data_len = sizeof(uint32_t);
return &obj->use;
case NFTNL_OBJ_HANDLE:
*data_len = sizeof(uint64_t);
return &obj->handle;
case NFTNL_OBJ_USERDATA:
*data_len = obj->user.len;
return obj->user.data;
default:
if (obj->ops)
return obj->ops->get(obj, attr, data_len);
break;
}
return NULL;
}
EXPORT_SYMBOL(nftnl_obj_get);
const void *nftnl_obj_get(struct nftnl_obj *obj, uint16_t attr)
{
uint32_t data_len;
return nftnl_obj_get_data(obj, attr, &data_len);
}
EXPORT_SYMBOL(nftnl_obj_get_u8);
uint8_t nftnl_obj_get_u8(struct nftnl_obj *obj, uint16_t attr)
{
const void *ret = nftnl_obj_get(obj, attr);
return ret == NULL ? 0 : *((uint8_t *)ret);
}
EXPORT_SYMBOL(nftnl_obj_get_u16);
uint16_t nftnl_obj_get_u16(struct nftnl_obj *obj, uint16_t attr)
{
const void *ret = nftnl_obj_get(obj, attr);
return ret == NULL ? 0 : *((uint16_t *)ret);
}
EXPORT_SYMBOL(nftnl_obj_get_u32);
uint32_t nftnl_obj_get_u32(struct nftnl_obj *obj, uint16_t attr)
{
const void *ret = nftnl_obj_get(obj, attr);
return ret == NULL ? 0 : *((uint32_t *)ret);
}
EXPORT_SYMBOL(nftnl_obj_get_u64);
uint64_t nftnl_obj_get_u64(struct nftnl_obj *obj, uint16_t attr)
{
const void *ret = nftnl_obj_get(obj, attr);
return ret == NULL ? 0 : *((uint64_t *)ret);
}
EXPORT_SYMBOL(nftnl_obj_get_str);
const char *nftnl_obj_get_str(struct nftnl_obj *obj, uint16_t attr)
{
return nftnl_obj_get(obj, attr);
}
EXPORT_SYMBOL(nftnl_obj_nlmsg_build_payload);
void nftnl_obj_nlmsg_build_payload(struct nlmsghdr *nlh,
const struct nftnl_obj *obj)
{
if (obj->flags & (1 << NFTNL_OBJ_TABLE))
mnl_attr_put_strz(nlh, NFTA_OBJ_TABLE, obj->table);
if (obj->flags & (1 << NFTNL_OBJ_NAME))
mnl_attr_put_strz(nlh, NFTA_OBJ_NAME, obj->name);
if (obj->flags & (1 << NFTNL_OBJ_TYPE))
mnl_attr_put_u32(nlh, NFTA_OBJ_TYPE, htonl(obj->ops->type));
if (obj->flags & (1 << NFTNL_OBJ_HANDLE))
mnl_attr_put_u64(nlh, NFTA_OBJ_HANDLE, htobe64(obj->handle));
if (obj->flags & (1 << NFTNL_OBJ_USERDATA))
mnl_attr_put(nlh, NFTA_OBJ_USERDATA, obj->user.len, obj->user.data);
if (obj->ops) {
struct nlattr *nest = mnl_attr_nest_start(nlh, NFTA_OBJ_DATA);
obj->ops->build(nlh, obj);
mnl_attr_nest_end(nlh, nest);
}
}
static int nftnl_obj_parse_attr_cb(const struct nlattr *attr, void *data)
{
const struct nlattr **tb = data;
int type = mnl_attr_get_type(attr);
if (mnl_attr_type_valid(attr, NFTA_OBJ_MAX) < 0)
return MNL_CB_OK;
switch(type) {
case NFTA_OBJ_TABLE:
case NFTA_OBJ_NAME:
if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
abi_breakage();
break;
case NFTA_OBJ_HANDLE:
if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
abi_breakage();
break;
case NFTA_OBJ_DATA:
if (mnl_attr_validate(attr, MNL_TYPE_NESTED) < 0)
abi_breakage();
break;
case NFTA_OBJ_USE:
if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
abi_breakage();
break;
case NFTA_OBJ_USERDATA:
if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0)
abi_breakage();
break;
}
tb[type] = attr;
return MNL_CB_OK;
}
EXPORT_SYMBOL(nftnl_obj_nlmsg_parse);
int nftnl_obj_nlmsg_parse(const struct nlmsghdr *nlh, struct nftnl_obj *obj)
{
struct nfgenmsg *nfg = mnl_nlmsg_get_payload(nlh);
struct nlattr *tb[NFTA_OBJ_MAX + 1] = {};
int err;
if (mnl_attr_parse(nlh, sizeof(*nfg), nftnl_obj_parse_attr_cb, tb) < 0)
return -1;
if (tb[NFTA_OBJ_TABLE]) {
obj->table = strdup(mnl_attr_get_str(tb[NFTA_OBJ_TABLE]));
obj->flags |= (1 << NFTNL_OBJ_TABLE);
}
if (tb[NFTA_OBJ_NAME]) {
obj->name = strdup(mnl_attr_get_str(tb[NFTA_OBJ_NAME]));
obj->flags |= (1 << NFTNL_OBJ_NAME);
}
if (tb[NFTA_OBJ_TYPE]) {
uint32_t type = ntohl(mnl_attr_get_u32(tb[NFTA_OBJ_TYPE]));
obj->ops = nftnl_obj_ops_lookup(type);
if (obj->ops)
obj->flags |= (1 << NFTNL_OBJ_TYPE);
}
if (tb[NFTA_OBJ_DATA]) {
if (obj->ops) {
err = obj->ops->parse(obj, tb[NFTA_OBJ_DATA]);
if (err < 0)
return err;
}
}
if (tb[NFTA_OBJ_USE]) {
obj->use = ntohl(mnl_attr_get_u32(tb[NFTA_OBJ_USE]));
obj->flags |= (1 << NFTNL_OBJ_USE);
}
if (tb[NFTA_OBJ_HANDLE]) {
obj->handle = be64toh(mnl_attr_get_u64(tb[NFTA_OBJ_HANDLE]));
obj->flags |= (1 << NFTNL_OBJ_HANDLE);
}
if (tb[NFTA_OBJ_USERDATA]) {
nftnl_obj_set_data(obj, NFTNL_OBJ_USERDATA,
mnl_attr_get_payload(tb[NFTA_OBJ_USERDATA]),
mnl_attr_get_payload_len(tb[NFTA_OBJ_USERDATA]));
}
obj->family = nfg->nfgen_family;
obj->flags |= (1 << NFTNL_OBJ_FAMILY);
return 0;
}
static int nftnl_obj_do_parse(struct nftnl_obj *obj, enum nftnl_parse_type type,
const void *data, struct nftnl_parse_err *err,
enum nftnl_parse_input input)
{
struct nftnl_parse_err perr = {};
int ret;
switch (type) {
case NFTNL_PARSE_JSON:
case NFTNL_PARSE_XML:
default:
ret = -1;
errno = EOPNOTSUPP;
break;
}
if (err != NULL)
*err = perr;
return ret;
}
EXPORT_SYMBOL(nftnl_obj_parse);
int nftnl_obj_parse(struct nftnl_obj *obj, enum nftnl_parse_type type,
const char *data, struct nftnl_parse_err *err)
{
return nftnl_obj_do_parse(obj, type, data, err, NFTNL_PARSE_BUFFER);
}
EXPORT_SYMBOL(nftnl_obj_parse_file);
int nftnl_obj_parse_file(struct nftnl_obj *obj, enum nftnl_parse_type type,
FILE *fp, struct nftnl_parse_err *err)
{
return nftnl_obj_do_parse(obj, type, fp, err, NFTNL_PARSE_FILE);
}
static int nftnl_obj_snprintf_dflt(char *buf, size_t size,
const struct nftnl_obj *obj,
uint32_t type, uint32_t flags)
{
const char *name = obj->ops ? obj->ops->name : "(unknown)";
int ret, remain = size, offset = 0;
ret = snprintf(buf, size, "table %s name %s use %u [ %s ",
obj->table, obj->name, obj->use, name);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
if (obj->ops) {
ret = obj->ops->snprintf(buf + offset, offset, type, flags,
obj);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
ret = snprintf(buf + offset, offset, "]");
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
return offset;
}
static int nftnl_obj_cmd_snprintf(char *buf, size_t size,
const struct nftnl_obj *obj, uint32_t cmd,
uint32_t type, uint32_t flags)
{
int ret, remain = size, offset = 0;
switch (type) {
case NFTNL_OUTPUT_DEFAULT:
ret = nftnl_obj_snprintf_dflt(buf + offset, remain, obj, type,
flags);
break;
case NFTNL_OUTPUT_JSON:
case NFTNL_OUTPUT_XML:
default:
return -1;
}
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
return offset;
}
EXPORT_SYMBOL(nftnl_obj_snprintf);
int nftnl_obj_snprintf(char *buf, size_t size, const struct nftnl_obj *obj,
uint32_t type, uint32_t flags)
{
if (size)
buf[0] = '\0';
return nftnl_obj_cmd_snprintf(buf, size, obj, nftnl_flag2cmd(flags),
type, flags);
}
static int nftnl_obj_do_snprintf(char *buf, size_t size, const void *obj,
uint32_t cmd, uint32_t type, uint32_t flags)
{
return nftnl_obj_snprintf(buf, size, obj, type, flags);
}
EXPORT_SYMBOL(nftnl_obj_fprintf);
int nftnl_obj_fprintf(FILE *fp, const struct nftnl_obj *obj, uint32_t type,
uint32_t flags)
{
return nftnl_fprintf(fp, obj, NFTNL_CMD_UNSPEC, type, flags,
nftnl_obj_do_snprintf);
}
struct nftnl_obj_list {
struct list_head list;
};
EXPORT_SYMBOL(nftnl_obj_list_alloc);
struct nftnl_obj_list *nftnl_obj_list_alloc(void)
{
struct nftnl_obj_list *list;
list = calloc(1, sizeof(struct nftnl_obj_list));
if (list == NULL)
return NULL;
INIT_LIST_HEAD(&list->list);
return list;
}
EXPORT_SYMBOL(nftnl_obj_list_free);
void nftnl_obj_list_free(struct nftnl_obj_list *list)
{
struct nftnl_obj *r, *tmp;
list_for_each_entry_safe(r, tmp, &list->list, head) {
list_del(&r->head);
nftnl_obj_free(r);
}
xfree(list);
}
EXPORT_SYMBOL(nftnl_obj_list_is_empty);
int nftnl_obj_list_is_empty(struct nftnl_obj_list *list)
{
return list_empty(&list->list);
}
EXPORT_SYMBOL(nftnl_obj_list_add);
void nftnl_obj_list_add(struct nftnl_obj *r, struct nftnl_obj_list *list)
{
list_add(&r->head, &list->list);
}
EXPORT_SYMBOL(nftnl_obj_list_add_tail);
void nftnl_obj_list_add_tail(struct nftnl_obj *r,
struct nftnl_obj_list *list)
{
list_add_tail(&r->head, &list->list);
}
EXPORT_SYMBOL(nftnl_obj_list_del);
void nftnl_obj_list_del(struct nftnl_obj *t)
{
list_del(&t->head);
}
EXPORT_SYMBOL(nftnl_obj_list_foreach);
int nftnl_obj_list_foreach(struct nftnl_obj_list *table_list,
int (*cb)(struct nftnl_obj *t, void *data),
void *data)
{
struct nftnl_obj *cur, *tmp;
int ret;
list_for_each_entry_safe(cur, tmp, &table_list->list, head) {
ret = cb(cur, data);
if (ret < 0)
return ret;
}
return 0;
}
struct nftnl_obj_list_iter {
struct nftnl_obj_list *list;
struct nftnl_obj *cur;
};
EXPORT_SYMBOL(nftnl_obj_list_iter_create);
struct nftnl_obj_list_iter *
nftnl_obj_list_iter_create(struct nftnl_obj_list *l)
{
struct nftnl_obj_list_iter *iter;
iter = calloc(1, sizeof(struct nftnl_obj_list_iter));
if (iter == NULL)
return NULL;
iter->list = l;
if (nftnl_obj_list_is_empty(l))
iter->cur = NULL;
else
iter->cur = list_entry(l->list.next, struct nftnl_obj, head);
return iter;
}
EXPORT_SYMBOL(nftnl_obj_list_iter_next);
struct nftnl_obj *nftnl_obj_list_iter_next(struct nftnl_obj_list_iter *iter)
{
struct nftnl_obj *r = iter->cur;
if (r == NULL)
return NULL;
/* get next table, if any */
iter->cur = list_entry(iter->cur->head.next, struct nftnl_obj, head);
if (&iter->cur->head == iter->list->list.next)
return NULL;
return r;
}
EXPORT_SYMBOL(nftnl_obj_list_iter_destroy);
void nftnl_obj_list_iter_destroy(struct nftnl_obj_list_iter *iter)
{
xfree(iter);
}
nftnl_obj_list_iter
Definition: object.c:526
nftnl_obj_list
Definition: object.c:455