table.c
/*
* (C) 2012-2013 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.
*
* This code has been sponsored by Sophos Astaro <http://www.sophos.com>
*/
#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/table.h>
struct nftnl_table {
struct list_head head;
const char *name;
uint32_t family;
uint32_t table_flags;
uint64_t handle;
uint32_t use;
uint32_t flags;
struct {
void *data;
uint32_t len;
} user;
};
EXPORT_SYMBOL(nftnl_table_alloc);
struct nftnl_table *nftnl_table_alloc(void)
{
return calloc(1, sizeof(struct nftnl_table));
}
EXPORT_SYMBOL(nftnl_table_free);
void nftnl_table_free(const struct nftnl_table *t)
{
if (t->flags & (1 << NFTNL_TABLE_NAME))
xfree(t->name);
if (t->flags & (1 << NFTNL_TABLE_USERDATA))
xfree(t->user.data);
xfree(t);
}
EXPORT_SYMBOL(nftnl_table_is_set);
bool nftnl_table_is_set(const struct nftnl_table *t, uint16_t attr)
{
return t->flags & (1 << attr);
}
EXPORT_SYMBOL(nftnl_table_unset);
void nftnl_table_unset(struct nftnl_table *t, uint16_t attr)
{
if (!(t->flags & (1 << attr)))
return;
switch (attr) {
case NFTNL_TABLE_NAME:
xfree(t->name);
break;
case NFTNL_TABLE_FLAGS:
case NFTNL_TABLE_HANDLE:
case NFTNL_TABLE_FAMILY:
break;
case NFTNL_TABLE_USE:
break;
}
t->flags &= ~(1 << attr);
}
static uint32_t nftnl_table_validate[NFTNL_TABLE_MAX + 1] = {
[NFTNL_TABLE_FLAGS] = sizeof(uint32_t),
[NFTNL_TABLE_FAMILY] = sizeof(uint32_t),
[NFTNL_TABLE_HANDLE] = sizeof(uint64_t),
};
EXPORT_SYMBOL(nftnl_table_set_data);
int nftnl_table_set_data(struct nftnl_table *t, uint16_t attr,
const void *data, uint32_t data_len)
{
nftnl_assert_attr_exists(attr, NFTNL_TABLE_MAX);
nftnl_assert_validate(data, nftnl_table_validate, attr, data_len);
switch (attr) {
case NFTNL_TABLE_NAME:
if (t->flags & (1 << NFTNL_TABLE_NAME))
xfree(t->name);
t->name = strdup(data);
if (!t->name)
return -1;
break;
case NFTNL_TABLE_HANDLE:
memcpy(&t->handle, data, sizeof(t->handle));
break;
case NFTNL_TABLE_FLAGS:
memcpy(&t->table_flags, data, sizeof(t->table_flags));
break;
case NFTNL_TABLE_FAMILY:
memcpy(&t->family, data, sizeof(t->family));
break;
case NFTNL_TABLE_USE:
memcpy(&t->use, data, sizeof(t->use));
break;
case NFTNL_TABLE_USERDATA:
if (t->flags & (1 << NFTNL_TABLE_USERDATA))
xfree(t->user.data);
t->user.data = malloc(data_len);
if (!t->user.data)
return -1;
memcpy(t->user.data, data, data_len);
t->user.len = data_len;
break;
}
t->flags |= (1 << attr);
return 0;
}
void nftnl_table_set(struct nftnl_table *t, uint16_t attr, const void *data) __visible;
void nftnl_table_set(struct nftnl_table *t, uint16_t attr, const void *data)
{
nftnl_table_set_data(t, attr, data, nftnl_table_validate[attr]);
}
EXPORT_SYMBOL(nftnl_table_set_u32);
void nftnl_table_set_u32(struct nftnl_table *t, uint16_t attr, uint32_t val)
{
nftnl_table_set_data(t, attr, &val, sizeof(uint32_t));
}
EXPORT_SYMBOL(nftnl_table_set_u64);
void nftnl_table_set_u64(struct nftnl_table *t, uint16_t attr, uint64_t val)
{
nftnl_table_set_data(t, attr, &val, sizeof(uint64_t));
}
EXPORT_SYMBOL(nftnl_table_set_u8);
void nftnl_table_set_u8(struct nftnl_table *t, uint16_t attr, uint8_t val)
{
nftnl_table_set_data(t, attr, &val, sizeof(uint8_t));
}
EXPORT_SYMBOL(nftnl_table_set_str);
int nftnl_table_set_str(struct nftnl_table *t, uint16_t attr, const char *str)
{
return nftnl_table_set_data(t, attr, str, strlen(str) + 1);
}
EXPORT_SYMBOL(nftnl_table_get_data);
const void *nftnl_table_get_data(const struct nftnl_table *t, uint16_t attr,
uint32_t *data_len)
{
if (!(t->flags & (1 << attr)))
return NULL;
switch(attr) {
case NFTNL_TABLE_NAME:
*data_len = strlen(t->name) + 1;
return t->name;
case NFTNL_TABLE_HANDLE:
*data_len = sizeof(uint64_t);
return &t->handle;
case NFTNL_TABLE_FLAGS:
*data_len = sizeof(uint32_t);
return &t->table_flags;
case NFTNL_TABLE_FAMILY:
*data_len = sizeof(uint32_t);
return &t->family;
case NFTNL_TABLE_USE:
*data_len = sizeof(uint32_t);
return &t->use;
case NFTNL_TABLE_USERDATA:
*data_len = t->user.len;
return t->user.data;
}
return NULL;
}
EXPORT_SYMBOL(nftnl_table_get);
const void *nftnl_table_get(const struct nftnl_table *t, uint16_t attr)
{
uint32_t data_len;
return nftnl_table_get_data(t, attr, &data_len);
}
EXPORT_SYMBOL(nftnl_table_get_u32);
uint32_t nftnl_table_get_u32(const struct nftnl_table *t, uint16_t attr)
{
const void *ret = nftnl_table_get(t, attr);
return ret == NULL ? 0 : *((uint32_t *)ret);
}
EXPORT_SYMBOL(nftnl_table_get_u64);
uint64_t nftnl_table_get_u64(const struct nftnl_table *t, uint16_t attr)
{
const void *ret = nftnl_table_get(t, attr);
return ret == NULL ? 0 : *((uint64_t *)ret);
}
EXPORT_SYMBOL(nftnl_table_get_u8);
uint8_t nftnl_table_get_u8(const struct nftnl_table *t, uint16_t attr)
{
const void *ret = nftnl_table_get(t, attr);
return ret == NULL ? 0 : *((uint8_t *)ret);
}
EXPORT_SYMBOL(nftnl_table_get_str);
const char *nftnl_table_get_str(const struct nftnl_table *t, uint16_t attr)
{
return nftnl_table_get(t, attr);
}
EXPORT_SYMBOL(nftnl_table_nlmsg_build_payload);
void nftnl_table_nlmsg_build_payload(struct nlmsghdr *nlh, const struct nftnl_table *t)
{
if (t->flags & (1 << NFTNL_TABLE_NAME))
mnl_attr_put_strz(nlh, NFTA_TABLE_NAME, t->name);
if (t->flags & (1 << NFTNL_TABLE_HANDLE))
mnl_attr_put_u64(nlh, NFTA_TABLE_HANDLE, htobe64(t->handle));
if (t->flags & (1 << NFTNL_TABLE_FLAGS))
mnl_attr_put_u32(nlh, NFTA_TABLE_FLAGS, htonl(t->table_flags));
if (t->flags & (1 << NFTNL_TABLE_USERDATA))
mnl_attr_put(nlh, NFTA_TABLE_USERDATA, t->user.len, t->user.data);
}
static int nftnl_table_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_TABLE_MAX) < 0)
return MNL_CB_OK;
switch(type) {
case NFTA_TABLE_NAME:
if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
abi_breakage();
break;
case NFTA_TABLE_HANDLE:
if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
abi_breakage();
break;
case NFTA_TABLE_FLAGS:
case NFTA_TABLE_USE:
if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
abi_breakage();
break;
case NFTA_TABLE_USERDATA:
if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0)
abi_breakage();
break;
}
tb[type] = attr;
return MNL_CB_OK;
}
EXPORT_SYMBOL(nftnl_table_nlmsg_parse);
int nftnl_table_nlmsg_parse(const struct nlmsghdr *nlh, struct nftnl_table *t)
{
struct nlattr *tb[NFTA_TABLE_MAX+1] = {};
struct nfgenmsg *nfg = mnl_nlmsg_get_payload(nlh);
int ret;
if (mnl_attr_parse(nlh, sizeof(*nfg), nftnl_table_parse_attr_cb, tb) < 0)
return -1;
if (tb[NFTA_TABLE_NAME]) {
if (t->flags & (1 << NFTNL_TABLE_NAME))
xfree(t->name);
t->name = strdup(mnl_attr_get_str(tb[NFTA_TABLE_NAME]));
if (!t->name)
return -1;
t->flags |= (1 << NFTNL_TABLE_NAME);
}
if (tb[NFTA_TABLE_FLAGS]) {
t->table_flags = ntohl(mnl_attr_get_u32(tb[NFTA_TABLE_FLAGS]));
t->flags |= (1 << NFTNL_TABLE_FLAGS);
}
if (tb[NFTA_TABLE_USE]) {
t->use = ntohl(mnl_attr_get_u32(tb[NFTA_TABLE_USE]));
t->flags |= (1 << NFTNL_TABLE_USE);
}
if (tb[NFTA_TABLE_HANDLE]) {
t->handle = be64toh(mnl_attr_get_u64(tb[NFTA_TABLE_HANDLE]));
t->flags |= (1 << NFTNL_TABLE_HANDLE);
}
if (tb[NFTA_TABLE_USERDATA]) {
ret = nftnl_table_set_data(t, NFTNL_TABLE_USERDATA,
mnl_attr_get_payload(tb[NFTA_TABLE_USERDATA]),
mnl_attr_get_payload_len(tb[NFTA_TABLE_USERDATA]));
if (ret < 0)
return ret;
}
t->family = nfg->nfgen_family;
t->flags |= (1 << NFTNL_TABLE_FAMILY);
return 0;
}
static int nftnl_table_do_parse(struct nftnl_table *t, enum nftnl_parse_type type,
const void *data, struct nftnl_parse_err *err,
enum nftnl_parse_input input)
{
int ret;
switch (type) {
case NFTNL_PARSE_JSON:
case NFTNL_PARSE_XML:
default:
ret = -1;
errno = EOPNOTSUPP;
break;
}
return ret;
}
EXPORT_SYMBOL(nftnl_table_parse);
int nftnl_table_parse(struct nftnl_table *t, enum nftnl_parse_type type,
const char *data, struct nftnl_parse_err *err)
{
return nftnl_table_do_parse(t, type, data, err, NFTNL_PARSE_BUFFER);
}
EXPORT_SYMBOL(nftnl_table_parse_file);
int nftnl_table_parse_file(struct nftnl_table *t, enum nftnl_parse_type type,
FILE *fp, struct nftnl_parse_err *err)
{
return nftnl_table_do_parse(t, type, fp, err, NFTNL_PARSE_FILE);
}
static int nftnl_table_snprintf_default(char *buf, size_t size,
const struct nftnl_table *t)
{
return snprintf(buf, size, "table %s %s flags %x use %d handle %llu",
t->name, nftnl_family2str(t->family),
t->table_flags, t->use, (unsigned long long)t->handle);
}
static int nftnl_table_cmd_snprintf(char *buf, size_t size,
const struct nftnl_table *t, uint32_t cmd,
uint32_t type, uint32_t flags)
{
int ret, remain = size, offset = 0;
switch (type) {
case NFTNL_OUTPUT_DEFAULT:
ret = nftnl_table_snprintf_default(buf + offset, remain, t);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
break;
case NFTNL_OUTPUT_XML:
case NFTNL_OUTPUT_JSON:
default:
return -1;
}
return offset;
}
EXPORT_SYMBOL(nftnl_table_snprintf);
int nftnl_table_snprintf(char *buf, size_t size, const struct nftnl_table *t,
uint32_t type, uint32_t flags)
{
if (size)
buf[0] = '\0';
return nftnl_table_cmd_snprintf(buf, size, t, nftnl_flag2cmd(flags), type,
flags);
}
static int nftnl_table_do_snprintf(char *buf, size_t size, const void *t,
uint32_t cmd, uint32_t type, uint32_t flags)
{
return nftnl_table_snprintf(buf, size, t, type, flags);
}
EXPORT_SYMBOL(nftnl_table_fprintf);
int nftnl_table_fprintf(FILE *fp, const struct nftnl_table *t, uint32_t type,
uint32_t flags)
{
return nftnl_fprintf(fp, t, NFTNL_CMD_UNSPEC, type, flags,
nftnl_table_do_snprintf);
}
struct nftnl_table_list {
struct list_head list;
};
EXPORT_SYMBOL(nftnl_table_list_alloc);
struct nftnl_table_list *nftnl_table_list_alloc(void)
{
struct nftnl_table_list *list;
list = calloc(1, sizeof(struct nftnl_table_list));
if (list == NULL)
return NULL;
INIT_LIST_HEAD(&list->list);
return list;
}
EXPORT_SYMBOL(nftnl_table_list_free);
void nftnl_table_list_free(struct nftnl_table_list *list)
{
struct nftnl_table *r, *tmp;
list_for_each_entry_safe(r, tmp, &list->list, head) {
list_del(&r->head);
nftnl_table_free(r);
}
xfree(list);
}
EXPORT_SYMBOL(nftnl_table_list_is_empty);
int nftnl_table_list_is_empty(const struct nftnl_table_list *list)
{
return list_empty(&list->list);
}
EXPORT_SYMBOL(nftnl_table_list_add);
void nftnl_table_list_add(struct nftnl_table *r, struct nftnl_table_list *list)
{
list_add(&r->head, &list->list);
}
EXPORT_SYMBOL(nftnl_table_list_add_tail);
void nftnl_table_list_add_tail(struct nftnl_table *r, struct nftnl_table_list *list)
{
list_add_tail(&r->head, &list->list);
}
EXPORT_SYMBOL(nftnl_table_list_del);
void nftnl_table_list_del(struct nftnl_table *t)
{
list_del(&t->head);
}
EXPORT_SYMBOL(nftnl_table_list_foreach);
int nftnl_table_list_foreach(struct nftnl_table_list *table_list,
int (*cb)(struct nftnl_table *t, void *data),
void *data)
{
struct nftnl_table *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_table_list_iter {
const struct nftnl_table_list *list;
struct nftnl_table *cur;
};
EXPORT_SYMBOL(nftnl_table_list_iter_create);
struct nftnl_table_list_iter *
nftnl_table_list_iter_create(const struct nftnl_table_list *l)
{
struct nftnl_table_list_iter *iter;
iter = calloc(1, sizeof(struct nftnl_table_list_iter));
if (iter == NULL)
return NULL;
iter->list = l;
if (nftnl_table_list_is_empty(l))
iter->cur = NULL;
else
iter->cur = list_entry(l->list.next, struct nftnl_table, head);
return iter;
}
EXPORT_SYMBOL(nftnl_table_list_iter_next);
struct nftnl_table *nftnl_table_list_iter_next(struct nftnl_table_list_iter *iter)
{
struct nftnl_table *r = iter->cur;
if (r == NULL)
return NULL;
/* get next table, if any */
iter->cur = list_entry(iter->cur->head.next, struct nftnl_table, head);
if (&iter->cur->head == iter->list->list.next)
return NULL;
return r;
}
EXPORT_SYMBOL(nftnl_table_list_iter_destroy);
void nftnl_table_list_iter_destroy(const struct nftnl_table_list_iter *iter)
{
xfree(iter);
}
nftnl_table_list_iter
Definition: table.c:473
nftnl_table_list
Definition: table.c:403
nftnl_table
Definition: table.c:28