rule.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 <stdlib.h>
#include <limits.h>
#include <string.h>
#include <netinet/in.h>
#include <errno.h>
#include <inttypes.h>
#include <ctype.h>
#include <libmnl/libmnl.h>
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nf_tables.h>
#include <libnftnl/rule.h>
#include <libnftnl/set.h>
#include <libnftnl/expr.h>
EXPORT_SYMBOL(nftnl_rule_alloc);
struct nftnl_rule *nftnl_rule_alloc(void)
{
struct nftnl_rule *r;
r = calloc(1, sizeof(struct nftnl_rule));
if (r == NULL)
return NULL;
INIT_LIST_HEAD(&r->expr_list);
return r;
}
EXPORT_SYMBOL(nftnl_rule_free);
void nftnl_rule_free(const struct nftnl_rule *r)
{
struct nftnl_expr *e, *tmp;
list_for_each_entry_safe(e, tmp, &r->expr_list, head)
nftnl_expr_free(e);
if (r->flags & (1 << (NFTNL_RULE_TABLE)))
xfree(r->table);
if (r->flags & (1 << (NFTNL_RULE_CHAIN)))
xfree(r->chain);
if (r->flags & (1 << (NFTNL_RULE_USERDATA)))
xfree(r->user.data);
xfree(r);
}
EXPORT_SYMBOL(nftnl_rule_is_set);
bool nftnl_rule_is_set(const struct nftnl_rule *r, uint16_t attr)
{
return r->flags & (1 << attr);
}
EXPORT_SYMBOL(nftnl_rule_unset);
void nftnl_rule_unset(struct nftnl_rule *r, uint16_t attr)
{
if (!(r->flags & (1 << attr)))
return;
switch (attr) {
case NFTNL_RULE_TABLE:
xfree(r->table);
break;
case NFTNL_RULE_CHAIN:
xfree(r->chain);
break;
case NFTNL_RULE_HANDLE:
case NFTNL_RULE_COMPAT_PROTO:
case NFTNL_RULE_COMPAT_FLAGS:
case NFTNL_RULE_POSITION:
case NFTNL_RULE_FAMILY:
case NFTNL_RULE_ID:
case NFTNL_RULE_POSITION_ID:
break;
case NFTNL_RULE_USERDATA:
xfree(r->user.data);
break;
}
r->flags &= ~(1 << attr);
}
static uint32_t nftnl_rule_validate[NFTNL_RULE_MAX + 1] = {
[NFTNL_RULE_HANDLE] = sizeof(uint64_t),
[NFTNL_RULE_COMPAT_PROTO] = sizeof(uint32_t),
[NFTNL_RULE_COMPAT_FLAGS] = sizeof(uint32_t),
[NFTNL_RULE_FAMILY] = sizeof(uint32_t),
[NFTNL_RULE_POSITION] = sizeof(uint64_t),
[NFTNL_RULE_ID] = sizeof(uint32_t),
[NFTNL_RULE_POSITION_ID] = sizeof(uint32_t),
};
EXPORT_SYMBOL(nftnl_rule_set_data);
int nftnl_rule_set_data(struct nftnl_rule *r, uint16_t attr,
const void *data, uint32_t data_len)
{
nftnl_assert_attr_exists(attr, NFTNL_RULE_MAX);
nftnl_assert_validate(data, nftnl_rule_validate, attr, data_len);
switch(attr) {
case NFTNL_RULE_TABLE:
if (r->flags & (1 << NFTNL_RULE_TABLE))
xfree(r->table);
r->table = strdup(data);
if (!r->table)
return -1;
break;
case NFTNL_RULE_CHAIN:
if (r->flags & (1 << NFTNL_RULE_CHAIN))
xfree(r->chain);
r->chain = strdup(data);
if (!r->chain)
return -1;
break;
case NFTNL_RULE_HANDLE:
memcpy(&r->handle, data, sizeof(r->handle));
break;
case NFTNL_RULE_COMPAT_PROTO:
memcpy(&r->compat.proto, data, sizeof(r->compat.proto));
break;
case NFTNL_RULE_COMPAT_FLAGS:
memcpy(&r->compat.flags, data, sizeof(r->compat.flags));
break;
case NFTNL_RULE_FAMILY:
memcpy(&r->family, data, sizeof(r->family));
break;
case NFTNL_RULE_POSITION:
memcpy(&r->position, data, sizeof(r->position));
break;
case NFTNL_RULE_USERDATA:
if (r->flags & (1 << NFTNL_RULE_USERDATA))
xfree(r->user.data);
r->user.data = malloc(data_len);
if (!r->user.data)
return -1;
memcpy(r->user.data, data, data_len);
r->user.len = data_len;
break;
case NFTNL_RULE_ID:
memcpy(&r->id, data, sizeof(r->id));
break;
case NFTNL_RULE_POSITION_ID:
memcpy(&r->position_id, data, sizeof(r->position_id));
break;
}
r->flags |= (1 << attr);
return 0;
}
int nftnl_rule_set(struct nftnl_rule *r, uint16_t attr, const void *data) __visible;
int nftnl_rule_set(struct nftnl_rule *r, uint16_t attr, const void *data)
{
return nftnl_rule_set_data(r, attr, data, nftnl_rule_validate[attr]);
}
EXPORT_SYMBOL(nftnl_rule_set_u32);
void nftnl_rule_set_u32(struct nftnl_rule *r, uint16_t attr, uint32_t val)
{
nftnl_rule_set_data(r, attr, &val, sizeof(uint32_t));
}
EXPORT_SYMBOL(nftnl_rule_set_u64);
void nftnl_rule_set_u64(struct nftnl_rule *r, uint16_t attr, uint64_t val)
{
nftnl_rule_set_data(r, attr, &val, sizeof(uint64_t));
}
EXPORT_SYMBOL(nftnl_rule_set_str);
int nftnl_rule_set_str(struct nftnl_rule *r, uint16_t attr, const char *str)
{
return nftnl_rule_set_data(r, attr, str, strlen(str) + 1);
}
EXPORT_SYMBOL(nftnl_rule_get_data);
const void *nftnl_rule_get_data(const struct nftnl_rule *r, uint16_t attr,
uint32_t *data_len)
{
if (!(r->flags & (1 << attr)))
return NULL;
switch(attr) {
case NFTNL_RULE_FAMILY:
*data_len = sizeof(uint32_t);
return &r->family;
case NFTNL_RULE_TABLE:
*data_len = strlen(r->table) + 1;
return r->table;
case NFTNL_RULE_CHAIN:
*data_len = strlen(r->chain) + 1;
return r->chain;
case NFTNL_RULE_HANDLE:
*data_len = sizeof(uint64_t);
return &r->handle;
case NFTNL_RULE_COMPAT_PROTO:
*data_len = sizeof(uint32_t);
return &r->compat.proto;
case NFTNL_RULE_COMPAT_FLAGS:
*data_len = sizeof(uint32_t);
return &r->compat.flags;
case NFTNL_RULE_POSITION:
*data_len = sizeof(uint64_t);
return &r->position;
case NFTNL_RULE_USERDATA:
*data_len = r->user.len;
return r->user.data;
case NFTNL_RULE_ID:
*data_len = sizeof(uint32_t);
return &r->id;
case NFTNL_RULE_POSITION_ID:
*data_len = sizeof(uint32_t);
return &r->position_id;
}
return NULL;
}
EXPORT_SYMBOL(nftnl_rule_get);
const void *nftnl_rule_get(const struct nftnl_rule *r, uint16_t attr)
{
uint32_t data_len;
return nftnl_rule_get_data(r, attr, &data_len);
}
EXPORT_SYMBOL(nftnl_rule_get_str);
const char *nftnl_rule_get_str(const struct nftnl_rule *r, uint16_t attr)
{
return nftnl_rule_get(r, attr);
}
EXPORT_SYMBOL(nftnl_rule_get_u32);
uint32_t nftnl_rule_get_u32(const struct nftnl_rule *r, uint16_t attr)
{
uint32_t data_len;
const uint32_t *val = nftnl_rule_get_data(r, attr, &data_len);
nftnl_assert(val, attr, data_len == sizeof(uint32_t));
return val ? *val : 0;
}
EXPORT_SYMBOL(nftnl_rule_get_u64);
uint64_t nftnl_rule_get_u64(const struct nftnl_rule *r, uint16_t attr)
{
uint32_t data_len;
const uint64_t *val = nftnl_rule_get_data(r, attr, &data_len);
nftnl_assert(val, attr, data_len == sizeof(uint64_t));
return val ? *val : 0;
}
EXPORT_SYMBOL(nftnl_rule_get_u8);
uint8_t nftnl_rule_get_u8(const struct nftnl_rule *r, uint16_t attr)
{
uint32_t data_len;
const uint8_t *val = nftnl_rule_get_data(r, attr, &data_len);
nftnl_assert(val, attr, data_len == sizeof(uint8_t));
return val ? *val : 0;
}
EXPORT_SYMBOL(nftnl_rule_nlmsg_build_payload);
void nftnl_rule_nlmsg_build_payload(struct nlmsghdr *nlh, struct nftnl_rule *r)
{
struct nftnl_expr *expr;
struct nlattr *nest, *nest2;
if (r->flags & (1 << NFTNL_RULE_TABLE))
mnl_attr_put_strz(nlh, NFTA_RULE_TABLE, r->table);
if (r->flags & (1 << NFTNL_RULE_CHAIN))
mnl_attr_put_strz(nlh, NFTA_RULE_CHAIN, r->chain);
if (r->flags & (1 << NFTNL_RULE_HANDLE))
mnl_attr_put_u64(nlh, NFTA_RULE_HANDLE, htobe64(r->handle));
if (r->flags & (1 << NFTNL_RULE_POSITION))
mnl_attr_put_u64(nlh, NFTA_RULE_POSITION, htobe64(r->position));
if (r->flags & (1 << NFTNL_RULE_USERDATA)) {
mnl_attr_put(nlh, NFTA_RULE_USERDATA, r->user.len,
r->user.data);
}
if (!list_empty(&r->expr_list)) {
nest = mnl_attr_nest_start(nlh, NFTA_RULE_EXPRESSIONS);
list_for_each_entry(expr, &r->expr_list, head) {
nest2 = mnl_attr_nest_start(nlh, NFTA_LIST_ELEM);
nftnl_expr_build_payload(nlh, expr);
mnl_attr_nest_end(nlh, nest2);
}
mnl_attr_nest_end(nlh, nest);
}
if (r->flags & (1 << NFTNL_RULE_COMPAT_PROTO) &&
r->flags & (1 << NFTNL_RULE_COMPAT_FLAGS)) {
nest = mnl_attr_nest_start(nlh, NFTA_RULE_COMPAT);
mnl_attr_put_u32(nlh, NFTA_RULE_COMPAT_PROTO,
htonl(r->compat.proto));
mnl_attr_put_u32(nlh, NFTA_RULE_COMPAT_FLAGS,
htonl(r->compat.flags));
mnl_attr_nest_end(nlh, nest);
}
if (r->flags & (1 << NFTNL_RULE_ID))
mnl_attr_put_u32(nlh, NFTA_RULE_ID, htonl(r->id));
if (r->flags & (1 << NFTNL_RULE_POSITION_ID))
mnl_attr_put_u32(nlh, NFTA_RULE_POSITION_ID, htonl(r->position_id));
}
EXPORT_SYMBOL(nftnl_rule_add_expr);
void nftnl_rule_add_expr(struct nftnl_rule *r, struct nftnl_expr *expr)
{
list_add_tail(&expr->head, &r->expr_list);
}
EXPORT_SYMBOL(nftnl_rule_del_expr);
void nftnl_rule_del_expr(struct nftnl_expr *expr)
{
list_del(&expr->head);
}
static int nftnl_rule_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_RULE_MAX) < 0)
return MNL_CB_OK;
switch(type) {
case NFTA_RULE_TABLE:
case NFTA_RULE_CHAIN:
if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
abi_breakage();
break;
case NFTA_RULE_HANDLE:
if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
abi_breakage();
break;
case NFTA_RULE_COMPAT:
if (mnl_attr_validate(attr, MNL_TYPE_NESTED) < 0)
abi_breakage();
break;
case NFTA_RULE_POSITION:
if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
abi_breakage();
break;
case NFTA_RULE_USERDATA:
if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0)
abi_breakage();
break;
case NFTA_RULE_ID:
case NFTA_RULE_POSITION_ID:
if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
abi_breakage();
break;
}
tb[type] = attr;
return MNL_CB_OK;
}
static int nftnl_rule_parse_expr(struct nlattr *nest, struct nftnl_rule *r)
{
struct nftnl_expr *expr;
struct nlattr *attr;
mnl_attr_for_each_nested(attr, nest) {
if (mnl_attr_get_type(attr) != NFTA_LIST_ELEM)
return -1;
expr = nftnl_expr_parse(attr);
if (expr == NULL)
return -1;
list_add_tail(&expr->head, &r->expr_list);
}
return 0;
}
static int nftnl_rule_parse_compat_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_RULE_COMPAT_MAX) < 0)
return MNL_CB_OK;
switch(type) {
case NFTA_RULE_COMPAT_PROTO:
case NFTA_RULE_COMPAT_FLAGS:
if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
abi_breakage();
break;
}
tb[type] = attr;
return MNL_CB_OK;
}
static int nftnl_rule_parse_compat(struct nlattr *nest, struct nftnl_rule *r)
{
struct nlattr *tb[NFTA_RULE_COMPAT_MAX+1] = {};
if (mnl_attr_parse_nested(nest, nftnl_rule_parse_compat_cb, tb) < 0)
return -1;
if (tb[NFTA_RULE_COMPAT_PROTO]) {
r->compat.proto =
ntohl(mnl_attr_get_u32(tb[NFTA_RULE_COMPAT_PROTO]));
r->flags |= (1 << NFTNL_RULE_COMPAT_PROTO);
}
if (tb[NFTA_RULE_COMPAT_FLAGS]) {
r->compat.flags =
ntohl(mnl_attr_get_u32(tb[NFTA_RULE_COMPAT_FLAGS]));
r->flags |= (1 << NFTNL_RULE_COMPAT_FLAGS);
}
return 0;
}
EXPORT_SYMBOL(nftnl_rule_nlmsg_parse);
int nftnl_rule_nlmsg_parse(const struct nlmsghdr *nlh, struct nftnl_rule *r)
{
struct nlattr *tb[NFTA_RULE_MAX+1] = {};
struct nfgenmsg *nfg = mnl_nlmsg_get_payload(nlh);
int ret;
if (mnl_attr_parse(nlh, sizeof(*nfg), nftnl_rule_parse_attr_cb, tb) < 0)
return -1;
if (tb[NFTA_RULE_TABLE]) {
if (r->flags & (1 << NFTNL_RULE_TABLE))
xfree(r->table);
r->table = strdup(mnl_attr_get_str(tb[NFTA_RULE_TABLE]));
if (!r->table)
return -1;
r->flags |= (1 << NFTNL_RULE_TABLE);
}
if (tb[NFTA_RULE_CHAIN]) {
if (r->flags & (1 << NFTNL_RULE_CHAIN))
xfree(r->chain);
r->chain = strdup(mnl_attr_get_str(tb[NFTA_RULE_CHAIN]));
if (!r->chain)
return -1;
r->flags |= (1 << NFTNL_RULE_CHAIN);
}
if (tb[NFTA_RULE_HANDLE]) {
r->handle = be64toh(mnl_attr_get_u64(tb[NFTA_RULE_HANDLE]));
r->flags |= (1 << NFTNL_RULE_HANDLE);
}
if (tb[NFTA_RULE_EXPRESSIONS]) {
ret = nftnl_rule_parse_expr(tb[NFTA_RULE_EXPRESSIONS], r);
if (ret < 0)
return ret;
}
if (tb[NFTA_RULE_COMPAT]) {
ret = nftnl_rule_parse_compat(tb[NFTA_RULE_COMPAT], r);
if (ret < 0)
return ret;
}
if (tb[NFTA_RULE_POSITION]) {
r->position = be64toh(mnl_attr_get_u64(tb[NFTA_RULE_POSITION]));
r->flags |= (1 << NFTNL_RULE_POSITION);
}
if (tb[NFTA_RULE_USERDATA]) {
const void *udata =
mnl_attr_get_payload(tb[NFTA_RULE_USERDATA]);
if (r->flags & (1 << NFTNL_RULE_USERDATA))
xfree(r->user.data);
r->user.len = mnl_attr_get_payload_len(tb[NFTA_RULE_USERDATA]);
r->user.data = malloc(r->user.len);
if (r->user.data == NULL)
return -1;
memcpy(r->user.data, udata, r->user.len);
r->flags |= (1 << NFTNL_RULE_USERDATA);
}
if (tb[NFTA_RULE_ID]) {
r->id = ntohl(mnl_attr_get_u32(tb[NFTA_RULE_ID]));
r->flags |= (1 << NFTNL_RULE_ID);
}
if (tb[NFTA_RULE_POSITION_ID]) {
r->position_id = ntohl(mnl_attr_get_u32(tb[NFTA_RULE_POSITION_ID]));
r->flags |= (1 << NFTNL_RULE_POSITION_ID);
}
r->family = nfg->nfgen_family;
r->flags |= (1 << NFTNL_RULE_FAMILY);
return 0;
}
static int nftnl_rule_do_parse(struct nftnl_rule *r, enum nftnl_parse_type type,
const void *data, struct nftnl_parse_err *err,
enum nftnl_parse_input input)
{
int ret;
struct nftnl_parse_err perr = {};
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_rule_parse);
int nftnl_rule_parse(struct nftnl_rule *r, enum nftnl_parse_type type,
const char *data, struct nftnl_parse_err *err)
{
return nftnl_rule_do_parse(r, type, data, err, NFTNL_PARSE_BUFFER);
}
EXPORT_SYMBOL(nftnl_rule_parse_file);
int nftnl_rule_parse_file(struct nftnl_rule *r, enum nftnl_parse_type type,
FILE *fp, struct nftnl_parse_err *err)
{
return nftnl_rule_do_parse(r, type, fp, err, NFTNL_PARSE_FILE);
}
static int nftnl_rule_snprintf_default(char *buf, size_t size,
const struct nftnl_rule *r,
uint32_t type, uint32_t flags)
{
struct nftnl_expr *expr;
int ret, remain = size, offset = 0, i;
if (r->flags & (1 << NFTNL_RULE_FAMILY)) {
ret = snprintf(buf + offset, remain, "%s ",
nftnl_family2str(r->family));
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
if (r->flags & (1 << NFTNL_RULE_TABLE)) {
ret = snprintf(buf + offset, remain, "%s ",
r->table);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
if (r->flags & (1 << NFTNL_RULE_CHAIN)) {
ret = snprintf(buf + offset, remain, "%s ",
r->chain);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
if (r->flags & (1 << NFTNL_RULE_HANDLE)) {
ret = snprintf(buf + offset, remain, "%llu ",
(unsigned long long)r->handle);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
if (r->flags & (1 << NFTNL_RULE_POSITION)) {
ret = snprintf(buf + offset, remain, "%llu ",
(unsigned long long)r->position);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
if (r->flags & (1 << NFTNL_RULE_ID)) {
ret = snprintf(buf + offset, remain, "%u ", r->id);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
if (r->flags & (1 << NFTNL_RULE_POSITION_ID)) {
ret = snprintf(buf + offset, remain, "%u ", r->position_id);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
ret = snprintf(buf + offset, remain, "\n");
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
list_for_each_entry(expr, &r->expr_list, head) {
ret = snprintf(buf + offset, remain, " [ %s ", expr->ops->name);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
ret = nftnl_expr_snprintf(buf + offset, remain, expr,
type, flags);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
ret = snprintf(buf + offset, remain, "]\n");
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
if (r->user.len) {
ret = snprintf(buf + offset, remain, " userdata = { ");
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
for (i = 0; i < r->user.len; i++) {
char *c = r->user.data;
ret = snprintf(buf + offset, remain, "%c",
isalnum(c[i]) ? c[i] : 0);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
ret = snprintf(buf + offset, remain, " }\n");
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
return offset;
}
static int nftnl_rule_cmd_snprintf(char *buf, size_t size,
const struct nftnl_rule *r, uint32_t cmd,
uint32_t type, uint32_t flags)
{
int ret, remain = size, offset = 0;
uint32_t inner_flags = flags;
inner_flags &= ~NFTNL_OF_EVENT_ANY;
switch(type) {
case NFTNL_OUTPUT_DEFAULT:
ret = nftnl_rule_snprintf_default(buf + offset, remain, r, type,
inner_flags);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
break;
case NFTNL_OUTPUT_JSON:
case NFTNL_OUTPUT_XML:
default:
return -1;
}
return offset;
}
EXPORT_SYMBOL(nftnl_rule_snprintf);
int nftnl_rule_snprintf(char *buf, size_t size, const struct nftnl_rule *r,
uint32_t type, uint32_t flags)
{
if (size)
buf[0] = '\0';
return nftnl_rule_cmd_snprintf(buf, size, r, nftnl_flag2cmd(flags), type,
flags);
}
static int nftnl_rule_do_snprintf(char *buf, size_t size, const void *r,
uint32_t cmd, uint32_t type, uint32_t flags)
{
return nftnl_rule_snprintf(buf, size, r, type, flags);
}
EXPORT_SYMBOL(nftnl_rule_fprintf);
int nftnl_rule_fprintf(FILE *fp, const struct nftnl_rule *r, uint32_t type,
uint32_t flags)
{
return nftnl_fprintf(fp, r, NFTNL_CMD_UNSPEC, type, flags,
nftnl_rule_do_snprintf);
}
EXPORT_SYMBOL(nftnl_expr_foreach);
int nftnl_expr_foreach(struct nftnl_rule *r,
int (*cb)(struct nftnl_expr *e, void *data),
void *data)
{
struct nftnl_expr *cur, *tmp;
int ret;
list_for_each_entry_safe(cur, tmp, &r->expr_list, head) {
ret = cb(cur, data);
if (ret < 0)
return ret;
}
return 0;
}
struct nftnl_expr_iter {
const struct nftnl_rule *r;
struct nftnl_expr *cur;
};
static void nftnl_expr_iter_init(const struct nftnl_rule *r,
struct nftnl_expr_iter *iter)
{
iter->r = r;
if (list_empty(&r->expr_list))
iter->cur = NULL;
else
iter->cur = list_entry(r->expr_list.next, struct nftnl_expr,
head);
}
EXPORT_SYMBOL(nftnl_expr_iter_create);
struct nftnl_expr_iter *nftnl_expr_iter_create(const struct nftnl_rule *r)
{
struct nftnl_expr_iter *iter;
iter = calloc(1, sizeof(struct nftnl_expr_iter));
if (iter == NULL)
return NULL;
nftnl_expr_iter_init(r, iter);
return iter;
}
EXPORT_SYMBOL(nftnl_expr_iter_next);
struct nftnl_expr *nftnl_expr_iter_next(struct nftnl_expr_iter *iter)
{
struct nftnl_expr *expr = iter->cur;
if (expr == NULL)
return NULL;
/* get next expression, if any */
iter->cur = list_entry(iter->cur->head.next, struct nftnl_expr, head);
if (&iter->cur->head == iter->r->expr_list.next)
return NULL;
return expr;
}
EXPORT_SYMBOL(nftnl_expr_iter_destroy);
void nftnl_expr_iter_destroy(struct nftnl_expr_iter *iter)
{
xfree(iter);
}
struct nftnl_rule_list {
struct list_head list;
};
EXPORT_SYMBOL(nftnl_rule_list_alloc);
struct nftnl_rule_list *nftnl_rule_list_alloc(void)
{
struct nftnl_rule_list *list;
list = calloc(1, sizeof(struct nftnl_rule_list));
if (list == NULL)
return NULL;
INIT_LIST_HEAD(&list->list);
return list;
}
EXPORT_SYMBOL(nftnl_rule_list_free);
void nftnl_rule_list_free(struct nftnl_rule_list *list)
{
struct nftnl_rule *r, *tmp;
list_for_each_entry_safe(r, tmp, &list->list, head) {
list_del(&r->head);
nftnl_rule_free(r);
}
xfree(list);
}
EXPORT_SYMBOL(nftnl_rule_list_is_empty);
int nftnl_rule_list_is_empty(const struct nftnl_rule_list *list)
{
return list_empty(&list->list);
}
EXPORT_SYMBOL(nftnl_rule_list_add);
void nftnl_rule_list_add(struct nftnl_rule *r, struct nftnl_rule_list *list)
{
list_add(&r->head, &list->list);
}
EXPORT_SYMBOL(nftnl_rule_list_insert_at);
void nftnl_rule_list_insert_at(struct nftnl_rule *r, struct nftnl_rule *pos)
{
list_add(&r->head, &pos->head);
}
EXPORT_SYMBOL(nftnl_rule_list_add_tail);
void nftnl_rule_list_add_tail(struct nftnl_rule *r, struct nftnl_rule_list *list)
{
list_add_tail(&r->head, &list->list);
}
EXPORT_SYMBOL(nftnl_rule_list_del);
void nftnl_rule_list_del(struct nftnl_rule *r)
{
list_del(&r->head);
}
EXPORT_SYMBOL(nftnl_rule_list_foreach);
int nftnl_rule_list_foreach(struct nftnl_rule_list *rule_list,
int (*cb)(struct nftnl_rule *r, void *data),
void *data)
{
struct nftnl_rule *cur, *tmp;
int ret;
list_for_each_entry_safe(cur, tmp, &rule_list->list, head) {
ret = cb(cur, data);
if (ret < 0)
return ret;
}
return 0;
}
struct nftnl_rule_list_iter {
const struct nftnl_rule_list *list;
struct nftnl_rule *cur;
};
EXPORT_SYMBOL(nftnl_rule_list_iter_create);
struct nftnl_rule_list_iter *
nftnl_rule_list_iter_create(const struct nftnl_rule_list *l)
{
struct nftnl_rule_list_iter *iter;
iter = calloc(1, sizeof(struct nftnl_rule_list_iter));
if (iter == NULL)
return NULL;
iter->list = l;
if (nftnl_rule_list_is_empty(l))
iter->cur = NULL;
else
iter->cur = list_entry(l->list.next, struct nftnl_rule, head);
return iter;
}
EXPORT_SYMBOL(nftnl_rule_list_iter_cur);
struct nftnl_rule *nftnl_rule_list_iter_cur(struct nftnl_rule_list_iter *iter)
{
return iter->cur;
}
EXPORT_SYMBOL(nftnl_rule_list_iter_next);
struct nftnl_rule *nftnl_rule_list_iter_next(struct nftnl_rule_list_iter *iter)
{
struct nftnl_rule *r = iter->cur;
if (r == NULL)
return NULL;
/* get next rule, if any */
iter->cur = list_entry(iter->cur->head.next, struct nftnl_rule, head);
if (&iter->cur->head == iter->list->list.next)
return NULL;
return r;
}
EXPORT_SYMBOL(nftnl_rule_list_iter_destroy);
void nftnl_rule_list_iter_destroy(const struct nftnl_rule_list_iter *iter)
{
xfree(iter);
}
nftnl_expr_iter
Definition: rule.c:694
nftnl_rule_list_iter
Definition: rule.c:822
nftnl_rule_list
Definition: rule.c:746