set_elem.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 <string.h>
#include <netinet/in.h>
#include <errno.h>
#include <ctype.h>
#include <libmnl/libmnl.h>
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nf_tables.h>
#include <libnftnl/set.h>
#include <libnftnl/rule.h>
#include <libnftnl/expr.h>
EXPORT_SYMBOL(nftnl_set_elem_alloc);
struct nftnl_set_elem *nftnl_set_elem_alloc(void)
{
struct nftnl_set_elem *s;
s = calloc(1, sizeof(struct nftnl_set_elem));
if (s == NULL)
return NULL;
INIT_LIST_HEAD(&s->expr_list);
return s;
}
EXPORT_SYMBOL(nftnl_set_elem_free);
void nftnl_set_elem_free(struct nftnl_set_elem *s)
{
struct nftnl_expr *e, *tmp;
if (s->flags & (1 << NFTNL_SET_ELEM_CHAIN))
xfree(s->data.chain);
list_for_each_entry_safe(e, tmp, &s->expr_list, head)
nftnl_expr_free(e);
if (s->flags & (1 << NFTNL_SET_ELEM_USERDATA))
xfree(s->user.data);
if (s->flags & (1 << NFTNL_SET_ELEM_OBJREF))
xfree(s->objref);
xfree(s);
}
EXPORT_SYMBOL(nftnl_set_elem_is_set);
bool nftnl_set_elem_is_set(const struct nftnl_set_elem *s, uint16_t attr)
{
return s->flags & (1 << attr);
}
EXPORT_SYMBOL(nftnl_set_elem_unset);
void nftnl_set_elem_unset(struct nftnl_set_elem *s, uint16_t attr)
{
struct nftnl_expr *expr, *tmp;
if (!(s->flags & (1 << attr)))
return;
switch (attr) {
case NFTNL_SET_ELEM_CHAIN:
xfree(s->data.chain);
break;
case NFTNL_SET_ELEM_FLAGS:
case NFTNL_SET_ELEM_KEY: /* NFTA_SET_ELEM_KEY */
case NFTNL_SET_ELEM_KEY_END: /* NFTA_SET_ELEM_KEY_END */
case NFTNL_SET_ELEM_VERDICT: /* NFTA_SET_ELEM_DATA */
case NFTNL_SET_ELEM_DATA: /* NFTA_SET_ELEM_DATA */
case NFTNL_SET_ELEM_TIMEOUT: /* NFTA_SET_ELEM_TIMEOUT */
case NFTNL_SET_ELEM_EXPIRATION: /* NFTA_SET_ELEM_EXPIRATION */
break;
case NFTNL_SET_ELEM_USERDATA: /* NFTA_SET_ELEM_USERDATA */
xfree(s->user.data);
break;
case NFTNL_SET_ELEM_EXPR:
case NFTNL_SET_ELEM_EXPRESSIONS:
list_for_each_entry_safe(expr, tmp, &s->expr_list, head)
nftnl_expr_free(expr);
break;
case NFTNL_SET_ELEM_OBJREF:
xfree(s->objref);
break;
default:
return;
}
s->flags &= ~(1 << attr);
}
static uint32_t nftnl_set_elem_validate[NFTNL_SET_ELEM_MAX + 1] = {
[NFTNL_SET_ELEM_FLAGS] = sizeof(uint32_t),
[NFTNL_SET_ELEM_VERDICT] = sizeof(uint32_t),
[NFTNL_SET_ELEM_TIMEOUT] = sizeof(uint64_t),
[NFTNL_SET_ELEM_EXPIRATION] = sizeof(uint64_t),
};
EXPORT_SYMBOL(nftnl_set_elem_set);
int nftnl_set_elem_set(struct nftnl_set_elem *s, uint16_t attr,
const void *data, uint32_t data_len)
{
struct nftnl_expr *expr, *tmp;
nftnl_assert_attr_exists(attr, NFTNL_SET_ELEM_MAX);
nftnl_assert_validate(data, nftnl_set_elem_validate, attr, data_len);
switch(attr) {
case NFTNL_SET_ELEM_FLAGS:
memcpy(&s->set_elem_flags, data, sizeof(s->set_elem_flags));
break;
case NFTNL_SET_ELEM_KEY: /* NFTA_SET_ELEM_KEY */
memcpy(&s->key.val, data, data_len);
s->key.len = data_len;
break;
case NFTNL_SET_ELEM_KEY_END: /* NFTA_SET_ELEM_KEY_END */
memcpy(&s->key_end.val, data, data_len);
s->key_end.len = data_len;
break;
case NFTNL_SET_ELEM_VERDICT: /* NFTA_SET_ELEM_DATA */
memcpy(&s->data.verdict, data, sizeof(s->data.verdict));
break;
case NFTNL_SET_ELEM_CHAIN: /* NFTA_SET_ELEM_DATA */
if (s->flags & (1 << NFTNL_SET_ELEM_CHAIN))
xfree(s->data.chain);
s->data.chain = strdup(data);
if (!s->data.chain)
return -1;
break;
case NFTNL_SET_ELEM_DATA: /* NFTA_SET_ELEM_DATA */
memcpy(s->data.val, data, data_len);
s->data.len = data_len;
break;
case NFTNL_SET_ELEM_TIMEOUT: /* NFTA_SET_ELEM_TIMEOUT */
memcpy(&s->timeout, data, sizeof(s->timeout));
break;
case NFTNL_SET_ELEM_EXPIRATION: /* NFTA_SET_ELEM_EXPIRATION */
memcpy(&s->expiration, data, sizeof(s->expiration));
break;
case NFTNL_SET_ELEM_USERDATA: /* NFTA_SET_ELEM_USERDATA */
if (s->flags & (1 << NFTNL_SET_ELEM_USERDATA))
xfree(s->user.data);
s->user.data = malloc(data_len);
if (!s->user.data)
return -1;
memcpy(s->user.data, data, data_len);
s->user.len = data_len;
break;
case NFTNL_SET_ELEM_OBJREF:
if (s->flags & (1 << NFTNL_SET_ELEM_OBJREF))
xfree(s->objref);
s->objref = strdup(data);
if (!s->objref)
return -1;
break;
case NFTNL_SET_ELEM_EXPR:
list_for_each_entry_safe(expr, tmp, &s->expr_list, head)
nftnl_expr_free(expr);
expr = (void *)data;
list_add(&expr->head, &s->expr_list);
break;
}
s->flags |= (1 << attr);
return 0;
}
EXPORT_SYMBOL(nftnl_set_elem_set_u32);
void nftnl_set_elem_set_u32(struct nftnl_set_elem *s, uint16_t attr, uint32_t val)
{
nftnl_set_elem_set(s, attr, &val, sizeof(uint32_t));
}
EXPORT_SYMBOL(nftnl_set_elem_set_u64);
void nftnl_set_elem_set_u64(struct nftnl_set_elem *s, uint16_t attr, uint64_t val)
{
nftnl_set_elem_set(s, attr, &val, sizeof(uint64_t));
}
EXPORT_SYMBOL(nftnl_set_elem_set_str);
int nftnl_set_elem_set_str(struct nftnl_set_elem *s, uint16_t attr, const char *str)
{
return nftnl_set_elem_set(s, attr, str, strlen(str) + 1);
}
EXPORT_SYMBOL(nftnl_set_elem_get);
const void *nftnl_set_elem_get(struct nftnl_set_elem *s, uint16_t attr, uint32_t *data_len)
{
struct nftnl_expr *expr;
if (!(s->flags & (1 << attr)))
return NULL;
switch(attr) {
case NFTNL_SET_ELEM_FLAGS:
*data_len = sizeof(s->set_elem_flags);
return &s->set_elem_flags;
case NFTNL_SET_ELEM_KEY: /* NFTA_SET_ELEM_KEY */
*data_len = s->key.len;
return &s->key.val;
case NFTNL_SET_ELEM_KEY_END: /* NFTA_SET_ELEM_KEY_END */
*data_len = s->key_end.len;
return &s->key_end.val;
case NFTNL_SET_ELEM_VERDICT: /* NFTA_SET_ELEM_DATA */
*data_len = sizeof(s->data.verdict);
return &s->data.verdict;
case NFTNL_SET_ELEM_CHAIN: /* NFTA_SET_ELEM_DATA */
*data_len = strlen(s->data.chain) + 1;
return s->data.chain;
case NFTNL_SET_ELEM_DATA: /* NFTA_SET_ELEM_DATA */
*data_len = s->data.len;
return &s->data.val;
case NFTNL_SET_ELEM_TIMEOUT: /* NFTA_SET_ELEM_TIMEOUT */
*data_len = sizeof(s->timeout);
return &s->timeout;
case NFTNL_SET_ELEM_EXPIRATION: /* NFTA_SET_ELEM_EXPIRATION */
*data_len = sizeof(s->expiration);
return &s->expiration;
case NFTNL_SET_ELEM_USERDATA:
*data_len = s->user.len;
return s->user.data;
case NFTNL_SET_ELEM_EXPR:
list_for_each_entry(expr, &s->expr_list, head)
break;
return expr;
case NFTNL_SET_ELEM_OBJREF:
*data_len = strlen(s->objref) + 1;
return s->objref;
}
return NULL;
}
EXPORT_SYMBOL(nftnl_set_elem_get_str);
const char *nftnl_set_elem_get_str(struct nftnl_set_elem *s, uint16_t attr)
{
uint32_t size;
return nftnl_set_elem_get(s, attr, &size);
}
EXPORT_SYMBOL(nftnl_set_elem_get_u32);
uint32_t nftnl_set_elem_get_u32(struct nftnl_set_elem *s, uint16_t attr)
{
uint32_t size, val;
memcpy(&val, nftnl_set_elem_get(s, attr, &size), sizeof(val));
return val;
}
EXPORT_SYMBOL(nftnl_set_elem_get_u64);
uint64_t nftnl_set_elem_get_u64(struct nftnl_set_elem *s, uint16_t attr)
{
uint32_t size;
uint64_t val;
memcpy(&val, nftnl_set_elem_get(s, attr, &size), sizeof(val));
return val;
}
struct nftnl_set_elem *nftnl_set_elem_clone(struct nftnl_set_elem *elem)
{
struct nftnl_set_elem *newelem;
newelem = nftnl_set_elem_alloc();
if (newelem == NULL)
return NULL;
memcpy(newelem, elem, sizeof(*elem));
if (elem->flags & (1 << NFTNL_SET_ELEM_CHAIN)) {
newelem->data.chain = strdup(elem->data.chain);
if (!newelem->data.chain)
goto err;
}
return newelem;
err:
nftnl_set_elem_free(newelem);
return NULL;
}
void nftnl_set_elem_nlmsg_build_payload(struct nlmsghdr *nlh,
struct nftnl_set_elem *e)
{
struct nftnl_expr *expr;
int num_exprs = 0;
if (e->flags & (1 << NFTNL_SET_ELEM_FLAGS))
mnl_attr_put_u32(nlh, NFTA_SET_ELEM_FLAGS, htonl(e->set_elem_flags));
if (e->flags & (1 << NFTNL_SET_ELEM_TIMEOUT))
mnl_attr_put_u64(nlh, NFTA_SET_ELEM_TIMEOUT, htobe64(e->timeout));
if (e->flags & (1 << NFTNL_SET_ELEM_EXPIRATION))
mnl_attr_put_u64(nlh, NFTA_SET_ELEM_EXPIRATION, htobe64(e->expiration));
if (e->flags & (1 << NFTNL_SET_ELEM_KEY)) {
struct nlattr *nest1;
nest1 = mnl_attr_nest_start(nlh, NFTA_SET_ELEM_KEY);
mnl_attr_put(nlh, NFTA_DATA_VALUE, e->key.len, e->key.val);
mnl_attr_nest_end(nlh, nest1);
}
if (e->flags & (1 << NFTNL_SET_ELEM_KEY_END)) {
struct nlattr *nest1;
nest1 = mnl_attr_nest_start(nlh, NFTA_SET_ELEM_KEY_END);
mnl_attr_put(nlh, NFTA_DATA_VALUE, e->key_end.len,
e->key_end.val);
mnl_attr_nest_end(nlh, nest1);
}
if (e->flags & (1 << NFTNL_SET_ELEM_VERDICT)) {
struct nlattr *nest1, *nest2;
nest1 = mnl_attr_nest_start(nlh, NFTA_SET_ELEM_DATA);
nest2 = mnl_attr_nest_start(nlh, NFTA_DATA_VERDICT);
mnl_attr_put_u32(nlh, NFTA_VERDICT_CODE, htonl(e->data.verdict));
if (e->flags & (1 << NFTNL_SET_ELEM_CHAIN))
mnl_attr_put_strz(nlh, NFTA_VERDICT_CHAIN, e->data.chain);
mnl_attr_nest_end(nlh, nest1);
mnl_attr_nest_end(nlh, nest2);
}
if (e->flags & (1 << NFTNL_SET_ELEM_DATA)) {
struct nlattr *nest1;
nest1 = mnl_attr_nest_start(nlh, NFTA_SET_ELEM_DATA);
mnl_attr_put(nlh, NFTA_DATA_VALUE, e->data.len, e->data.val);
mnl_attr_nest_end(nlh, nest1);
}
if (e->flags & (1 << NFTNL_SET_ELEM_USERDATA))
mnl_attr_put(nlh, NFTA_SET_ELEM_USERDATA, e->user.len, e->user.data);
if (e->flags & (1 << NFTNL_SET_ELEM_OBJREF))
mnl_attr_put_strz(nlh, NFTA_SET_ELEM_OBJREF, e->objref);
if (!list_empty(&e->expr_list)) {
list_for_each_entry(expr, &e->expr_list, head)
num_exprs++;
if (num_exprs == 1) {
struct nlattr *nest1;
nest1 = mnl_attr_nest_start(nlh, NFTA_SET_ELEM_EXPR);
list_for_each_entry(expr, &e->expr_list, head)
nftnl_expr_build_payload(nlh, expr);
mnl_attr_nest_end(nlh, nest1);
} else if (num_exprs > 1) {
struct nlattr *nest1, *nest2;
nest1 = mnl_attr_nest_start(nlh, NFTA_SET_ELEM_EXPRESSIONS);
list_for_each_entry(expr, &e->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, nest1);
}
}
}
static void nftnl_set_elem_nlmsg_build_def(struct nlmsghdr *nlh,
const struct nftnl_set *s)
{
if (s->flags & (1 << NFTNL_SET_NAME))
mnl_attr_put_strz(nlh, NFTA_SET_ELEM_LIST_SET, s->name);
if (s->flags & (1 << NFTNL_SET_ID))
mnl_attr_put_u32(nlh, NFTA_SET_ELEM_LIST_SET_ID, htonl(s->id));
if (s->flags & (1 << NFTNL_SET_TABLE))
mnl_attr_put_strz(nlh, NFTA_SET_ELEM_LIST_TABLE, s->table);
}
static struct nlattr *nftnl_set_elem_build(struct nlmsghdr *nlh,
struct nftnl_set_elem *elem, int i)
{
struct nlattr *nest2;
nest2 = mnl_attr_nest_start(nlh, i);
nftnl_set_elem_nlmsg_build_payload(nlh, elem);
mnl_attr_nest_end(nlh, nest2);
return nest2;
}
EXPORT_SYMBOL(nftnl_set_elems_nlmsg_build_payload);
void nftnl_set_elems_nlmsg_build_payload(struct nlmsghdr *nlh, struct nftnl_set *s)
{
struct nftnl_set_elem *elem;
struct nlattr *nest1;
int i = 0;
nftnl_set_elem_nlmsg_build_def(nlh, s);
if (list_empty(&s->element_list))
return;
nest1 = mnl_attr_nest_start(nlh, NFTA_SET_ELEM_LIST_ELEMENTS);
list_for_each_entry(elem, &s->element_list, head)
nftnl_set_elem_build(nlh, elem, ++i);
mnl_attr_nest_end(nlh, nest1);
}
EXPORT_SYMBOL(nftnl_set_elem_add_expr);
void nftnl_set_elem_add_expr(struct nftnl_set_elem *e, struct nftnl_expr *expr)
{
list_add_tail(&expr->head, &e->expr_list);
}
EXPORT_SYMBOL(nftnl_set_elem_expr_foreach);
int nftnl_set_elem_expr_foreach(struct nftnl_set_elem *e,
int (*cb)(struct nftnl_expr *e, void *data),
void *data)
{
struct nftnl_expr *cur, *tmp;
int ret;
list_for_each_entry_safe(cur, tmp, &e->expr_list, head) {
ret = cb(cur, data);
if (ret < 0)
return ret;
}
return 0;
}
static int nftnl_set_elem_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_SET_MAX) < 0)
return MNL_CB_OK;
switch(type) {
case NFTA_SET_ELEM_FLAGS:
if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
abi_breakage();
break;
case NFTA_SET_ELEM_TIMEOUT:
case NFTA_SET_ELEM_EXPIRATION:
if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
abi_breakage();
break;
case NFTA_SET_ELEM_KEY:
case NFTA_SET_ELEM_KEY_END:
case NFTA_SET_ELEM_DATA:
case NFTA_SET_ELEM_EXPR:
case NFTA_SET_ELEM_EXPRESSIONS:
if (mnl_attr_validate(attr, MNL_TYPE_NESTED) < 0)
abi_breakage();
break;
case NFTA_SET_ELEM_USERDATA:
if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0)
abi_breakage();
break;
}
tb[type] = attr;
return MNL_CB_OK;
}
static int nftnl_set_elems_parse2(struct nftnl_set *s, const struct nlattr *nest)
{
struct nlattr *tb[NFTA_SET_ELEM_MAX+1] = {};
struct nftnl_set_elem *e;
int ret, type;
e = nftnl_set_elem_alloc();
if (e == NULL)
return -1;
ret = mnl_attr_parse_nested(nest, nftnl_set_elem_parse_attr_cb, tb);
if (ret < 0)
goto out_set_elem;
if (tb[NFTA_SET_ELEM_FLAGS]) {
e->set_elem_flags =
ntohl(mnl_attr_get_u32(tb[NFTA_SET_ELEM_FLAGS]));
e->flags |= (1 << NFTNL_SET_ELEM_FLAGS);
}
if (tb[NFTA_SET_ELEM_TIMEOUT]) {
e->timeout = be64toh(mnl_attr_get_u64(tb[NFTA_SET_ELEM_TIMEOUT]));
e->flags |= (1 << NFTNL_SET_ELEM_TIMEOUT);
}
if (tb[NFTA_SET_ELEM_EXPIRATION]) {
e->expiration = be64toh(mnl_attr_get_u64(tb[NFTA_SET_ELEM_EXPIRATION]));
e->flags |= (1 << NFTNL_SET_ELEM_EXPIRATION);
}
if (tb[NFTA_SET_ELEM_KEY]) {
ret = nftnl_parse_data(&e->key, tb[NFTA_SET_ELEM_KEY], &type);
if (ret < 0)
goto out_set_elem;
e->flags |= (1 << NFTNL_SET_ELEM_KEY);
}
if (tb[NFTA_SET_ELEM_KEY_END]) {
ret = nftnl_parse_data(&e->key_end, tb[NFTA_SET_ELEM_KEY_END],
&type);
if (ret < 0)
goto out_set_elem;
e->flags |= (1 << NFTNL_SET_ELEM_KEY_END);
}
if (tb[NFTA_SET_ELEM_DATA]) {
ret = nftnl_parse_data(&e->data, tb[NFTA_SET_ELEM_DATA], &type);
if (ret < 0)
goto out_set_elem;
switch(type) {
case DATA_VERDICT:
e->flags |= (1 << NFTNL_SET_ELEM_VERDICT);
break;
case DATA_CHAIN:
e->flags |= (1 << NFTNL_SET_ELEM_VERDICT) |
(1 << NFTNL_SET_ELEM_CHAIN);
break;
case DATA_VALUE:
e->flags |= (1 << NFTNL_SET_ELEM_DATA);
break;
}
}
if (tb[NFTA_SET_ELEM_EXPR]) {
struct nftnl_expr *expr;
expr = nftnl_expr_parse(tb[NFTA_SET_ELEM_EXPR]);
if (expr == NULL) {
ret = -1;
goto out_set_elem;
}
list_add_tail(&expr->head, &e->expr_list);
e->flags |= (1 << NFTNL_SET_ELEM_EXPR);
} else if (tb[NFTA_SET_ELEM_EXPRESSIONS]) {
struct nftnl_expr *expr;
struct nlattr *attr;
mnl_attr_for_each_nested(attr, tb[NFTA_SET_ELEM_EXPRESSIONS]) {
if (mnl_attr_get_type(attr) != NFTA_LIST_ELEM) {
ret = -1;
goto out_set_elem;
}
expr = nftnl_expr_parse(attr);
if (expr == NULL) {
ret = -1;
goto out_set_elem;
}
list_add_tail(&expr->head, &e->expr_list);
}
e->flags |= (1 << NFTNL_SET_ELEM_EXPRESSIONS);
}
if (tb[NFTA_SET_ELEM_USERDATA]) {
const void *udata =
mnl_attr_get_payload(tb[NFTA_SET_ELEM_USERDATA]);
if (e->flags & (1 << NFTNL_RULE_USERDATA))
xfree(e->user.data);
e->user.len = mnl_attr_get_payload_len(tb[NFTA_SET_ELEM_USERDATA]);
e->user.data = malloc(e->user.len);
if (e->user.data == NULL) {
ret = -1;
goto out_set_elem;
}
memcpy(e->user.data, udata, e->user.len);
e->flags |= (1 << NFTNL_RULE_USERDATA);
}
if (tb[NFTA_SET_ELEM_OBJREF]) {
e->objref = strdup(mnl_attr_get_str(tb[NFTA_SET_ELEM_OBJREF]));
if (e->objref == NULL) {
ret = -1;
goto out_set_elem;
}
e->flags |= (1 << NFTNL_SET_ELEM_OBJREF);
}
/* Add this new element to this set */
list_add_tail(&e->head, &s->element_list);
return 0;
out_set_elem:
nftnl_set_elem_free(e);
return ret;
}
static int
nftnl_set_elem_list_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_SET_ELEM_LIST_MAX) < 0)
return MNL_CB_OK;
switch(type) {
case NFTA_SET_ELEM_LIST_TABLE:
case NFTA_SET_ELEM_LIST_SET:
if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
abi_breakage();
break;
case NFTA_SET_ELEM_LIST_ELEMENTS:
if (mnl_attr_validate(attr, MNL_TYPE_NESTED) < 0)
abi_breakage();
break;
}
tb[type] = attr;
return MNL_CB_OK;
}
static int nftnl_set_elems_parse(struct nftnl_set *s, const struct nlattr *nest)
{
struct nlattr *attr;
int ret = 0;
mnl_attr_for_each_nested(attr, nest) {
if (mnl_attr_get_type(attr) != NFTA_LIST_ELEM)
return -1;
ret = nftnl_set_elems_parse2(s, attr);
if (ret < 0)
return ret;
}
return ret;
}
EXPORT_SYMBOL(nftnl_set_elems_nlmsg_parse);
int nftnl_set_elems_nlmsg_parse(const struct nlmsghdr *nlh, struct nftnl_set *s)
{
struct nlattr *tb[NFTA_SET_ELEM_LIST_MAX+1] = {};
struct nfgenmsg *nfg = mnl_nlmsg_get_payload(nlh);
int ret;
if (mnl_attr_parse(nlh, sizeof(*nfg),
nftnl_set_elem_list_parse_attr_cb, tb) < 0)
return -1;
if (tb[NFTA_SET_ELEM_LIST_TABLE]) {
if (s->flags & (1 << NFTNL_SET_TABLE))
xfree(s->table);
s->table =
strdup(mnl_attr_get_str(tb[NFTA_SET_ELEM_LIST_TABLE]));
if (!s->table)
return -1;
s->flags |= (1 << NFTNL_SET_TABLE);
}
if (tb[NFTA_SET_ELEM_LIST_SET]) {
if (s->flags & (1 << NFTNL_SET_NAME))
xfree(s->name);
s->name =
strdup(mnl_attr_get_str(tb[NFTA_SET_ELEM_LIST_SET]));
if (!s->name)
return -1;
s->flags |= (1 << NFTNL_SET_NAME);
}
if (tb[NFTA_SET_ELEM_LIST_SET_ID]) {
s->id = ntohl(mnl_attr_get_u32(tb[NFTA_SET_ELEM_LIST_SET_ID]));
s->flags |= (1 << NFTNL_SET_ID);
}
if (tb[NFTA_SET_ELEM_LIST_ELEMENTS]) {
ret = nftnl_set_elems_parse(s, tb[NFTA_SET_ELEM_LIST_ELEMENTS]);
if (ret < 0)
return ret;
}
s->family = nfg->nfgen_family;
s->flags |= (1 << NFTNL_SET_FAMILY);
return 0;
}
EXPORT_SYMBOL(nftnl_set_elem_parse);
int nftnl_set_elem_parse(struct nftnl_set_elem *e, enum nftnl_parse_type type,
const char *data, struct nftnl_parse_err *err)
{
errno = EOPNOTSUPP;
return -1;
}
EXPORT_SYMBOL(nftnl_set_elem_parse_file);
int nftnl_set_elem_parse_file(struct nftnl_set_elem *e, enum nftnl_parse_type type,
FILE *fp, struct nftnl_parse_err *err)
{
errno = EOPNOTSUPP;
return -1;
}
static int nftnl_set_elem_snprintf_default(char *buf, size_t size,
const struct nftnl_set_elem *e)
{
int ret, remain = size, offset = 0, i;
ret = snprintf(buf, remain, "element ");
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
ret = nftnl_data_reg_snprintf(buf + offset, remain, &e->key,
NFTNL_OUTPUT_DEFAULT,
DATA_F_NOPFX, DATA_VALUE);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
if (e->flags & (1 << NFTNL_SET_ELEM_KEY_END)) {
ret = snprintf(buf + offset, remain, " - ");
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
ret = nftnl_data_reg_snprintf(buf + offset, remain, &e->key_end,
NFTNL_OUTPUT_DEFAULT,
DATA_F_NOPFX, DATA_VALUE);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
ret = snprintf(buf + offset, remain, " : ");
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
ret = nftnl_data_reg_snprintf(buf + offset, remain, &e->data,
NFTNL_OUTPUT_DEFAULT,
DATA_F_NOPFX, DATA_VALUE);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
ret = snprintf(buf + offset, remain, "%u [end]", e->set_elem_flags);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
if (e->user.len) {
ret = snprintf(buf + offset, remain, " userdata = {");
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
for (i = 0; i < e->user.len; i++) {
char *c = e->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_set_elem_cmd_snprintf(char *buf, size_t size,
const struct nftnl_set_elem *e,
uint32_t cmd, uint32_t type,
uint32_t flags)
{
int ret, remain = size, offset = 0;
switch(type) {
case NFTNL_OUTPUT_DEFAULT:
ret = nftnl_set_elem_snprintf_default(buf + offset, remain, e);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
break;
case NFTNL_OUTPUT_XML:
case NFTNL_OUTPUT_JSON:
break;
default:
return -1;
}
return offset;
}
EXPORT_SYMBOL(nftnl_set_elem_snprintf);
int nftnl_set_elem_snprintf(char *buf, size_t size,
const struct nftnl_set_elem *e,
uint32_t type, uint32_t flags)
{
if (size)
buf[0] = '\0';
return nftnl_set_elem_cmd_snprintf(buf, size, e, nftnl_flag2cmd(flags),
type, flags);
}
static int nftnl_set_elem_do_snprintf(char *buf, size_t size, const void *e,
uint32_t cmd, uint32_t type,
uint32_t flags)
{
return nftnl_set_elem_snprintf(buf, size, e, type, flags);
}
EXPORT_SYMBOL(nftnl_set_elem_fprintf);
int nftnl_set_elem_fprintf(FILE *fp, const struct nftnl_set_elem *se, uint32_t type,
uint32_t flags)
{
return nftnl_fprintf(fp, se, NFTNL_CMD_UNSPEC, type, flags,
nftnl_set_elem_do_snprintf);
}
EXPORT_SYMBOL(nftnl_set_elem_foreach);
int nftnl_set_elem_foreach(struct nftnl_set *s,
int (*cb)(struct nftnl_set_elem *e, void *data),
void *data)
{
struct nftnl_set_elem *elem;
int ret;
list_for_each_entry(elem, &s->element_list, head) {
ret = cb(elem, data);
if (ret < 0)
return ret;
}
return 0;
}
struct nftnl_set_elems_iter {
const struct nftnl_set *set;
const struct list_head *list;
struct nftnl_set_elem *cur;
};
EXPORT_SYMBOL(nftnl_set_elems_iter_create);
struct nftnl_set_elems_iter *
nftnl_set_elems_iter_create(const struct nftnl_set *s)
{
struct nftnl_set_elems_iter *iter;
iter = calloc(1, sizeof(struct nftnl_set_elems_iter));
if (iter == NULL)
return NULL;
iter->set = s;
iter->list = &s->element_list;
if (list_empty(&s->element_list))
iter->cur = NULL;
else
iter->cur = list_entry(s->element_list.next,
struct nftnl_set_elem, head);
return iter;
}
EXPORT_SYMBOL(nftnl_set_elems_iter_cur);
struct nftnl_set_elem *
nftnl_set_elems_iter_cur(const struct nftnl_set_elems_iter *iter)
{
return iter->cur;
}
EXPORT_SYMBOL(nftnl_set_elems_iter_next);
struct nftnl_set_elem *nftnl_set_elems_iter_next(struct nftnl_set_elems_iter *iter)
{
struct nftnl_set_elem *s = iter->cur;
if (s == NULL)
return NULL;
iter->cur = list_entry(iter->cur->head.next, struct nftnl_set_elem, head);
if (&iter->cur->head == iter->list->next)
return NULL;
return s;
}
EXPORT_SYMBOL(nftnl_set_elems_iter_destroy);
void nftnl_set_elems_iter_destroy(struct nftnl_set_elems_iter *iter)
{
xfree(iter);
}
static bool nftnl_attr_nest_overflow(struct nlmsghdr *nlh,
const struct nlattr *from,
const struct nlattr *to)
{
int len = (void *)to + to->nla_len - (void *)from;
/* The attribute length field is 16 bits long, thus the maximum payload
* that an attribute can convey is UINT16_MAX. In case of overflow,
* discard the last that did not fit into the attribute.
*/
if (len > UINT16_MAX) {
nlh->nlmsg_len -= to->nla_len;
return true;
}
return false;
}
EXPORT_SYMBOL(nftnl_set_elems_nlmsg_build_payload_iter);
int nftnl_set_elems_nlmsg_build_payload_iter(struct nlmsghdr *nlh,
struct nftnl_set_elems_iter *iter)
{
struct nftnl_set_elem *elem;
struct nlattr *nest1, *nest2;
int i = 0, ret = 0;
nftnl_set_elem_nlmsg_build_def(nlh, iter->set);
/* This set is empty, don't add an empty list element nest. */
if (list_empty(&iter->set->element_list))
return ret;
nest1 = mnl_attr_nest_start(nlh, NFTA_SET_ELEM_LIST_ELEMENTS);
elem = nftnl_set_elems_iter_next(iter);
while (elem != NULL) {
nest2 = nftnl_set_elem_build(nlh, elem, ++i);
if (nftnl_attr_nest_overflow(nlh, nest1, nest2)) {
/* Go back to previous not to miss this element */
iter->cur = list_entry(iter->cur->head.prev,
struct nftnl_set_elem, head);
ret = 1;
break;
}
elem = nftnl_set_elems_iter_next(iter);
}
mnl_attr_nest_end(nlh, nest1);
return ret;
}
nftnl_set_elems_iter
Definition: set_elem.c:819