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/*
* (C) 2012 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 <stdio.h>
#include <stdint.h>
#include <arpa/inet.h>
#include <errno.h>
#include <linux/netfilter/nf_tables.h>
#include "internal.h"
#include <libmnl/libmnl.h>
#include <libnftables/expr.h>
#include <libnftables/rule.h>
#include "expr_ops.h"
struct nft_expr_counter {
uint64_t pkts;
uint64_t bytes;
};
static int
nft_rule_expr_counter_set(struct nft_rule_expr *e, uint16_t type,
const void *data, size_t data_len)
{
struct nft_expr_counter *ctr = (struct nft_expr_counter *)e->data;
switch(type) {
case NFT_EXPR_CTR_BYTES:
ctr->bytes = *((uint64_t *)data);
break;
case NFT_EXPR_CTR_PACKETS:
ctr->pkts = *((uint64_t *)data);
break;
default:
return -1;
}
return 0;
}
static const void *
nft_rule_expr_counter_get(struct nft_rule_expr *e, uint16_t type, size_t *data_len)
{
struct nft_expr_counter *ctr = (struct nft_expr_counter *)e->data;
switch(type) {
case NFT_EXPR_CTR_BYTES:
if (e->flags & (1 << NFT_EXPR_CTR_BYTES)) {
*data_len = sizeof(ctr->bytes);
return &ctr->bytes;
} else
return NULL;
break;
case NFT_EXPR_CTR_PACKETS:
if (e->flags & (1 << NFT_EXPR_CTR_PACKETS)) {
*data_len = sizeof(ctr->pkts);
return &ctr->pkts;
} else
return NULL;
break;
default:
break;
}
return NULL;
}
static int nft_rule_expr_counter_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_COUNTER_MAX) < 0)
return MNL_CB_OK;
switch(type) {
case NFTA_COUNTER_BYTES:
case NFTA_COUNTER_PACKETS:
if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0) {
perror("mnl_attr_validate");
return MNL_CB_ERROR;
}
break;
}
tb[type] = attr;
return MNL_CB_OK;
}
static void
nft_rule_expr_counter_build(struct nlmsghdr *nlh, struct nft_rule_expr *e)
{
struct nft_expr_counter *ctr = (struct nft_expr_counter *)e->data;
if (e->flags & (1 << NFT_EXPR_CTR_BYTES))
mnl_attr_put_u64(nlh, NFTA_COUNTER_BYTES, htobe64(ctr->bytes));
if (e->flags & (1 << NFT_EXPR_CTR_PACKETS))
mnl_attr_put_u64(nlh, NFTA_COUNTER_PACKETS, htobe64(ctr->pkts));
}
static int
nft_rule_expr_counter_parse(struct nft_rule_expr *e, struct nlattr *attr)
{
struct nft_expr_counter *ctr = (struct nft_expr_counter *)e->data;
struct nlattr *tb[NFTA_COUNTER_MAX+1] = {};
if (mnl_attr_parse_nested(attr, nft_rule_expr_counter_cb, tb) < 0)
return -1;
if (tb[NFTA_COUNTER_BYTES]) {
ctr->bytes = be64toh(mnl_attr_get_u64(tb[NFTA_COUNTER_BYTES]));
e->flags |= (1 << NFT_EXPR_CTR_BYTES);
}
if (tb[NFTA_COUNTER_PACKETS]) {
ctr->pkts = be64toh(mnl_attr_get_u64(tb[NFTA_COUNTER_PACKETS]));
e->flags |= (1 << NFT_EXPR_CTR_PACKETS);
}
return 0;
}
static int
nft_rule_expr_counter_xml_parse(struct nft_rule_expr *e, char *xml)
{
#ifdef XML_PARSING
struct nft_expr_counter *ctr = (struct nft_expr_counter *)e->data;
mxml_node_t *tree = NULL;
mxml_node_t *node = NULL;
char *endptr;
uint64_t tmp;
tree = mxmlLoadString(NULL, xml, MXML_OPAQUE_CALLBACK);
if (tree == NULL)
return -1;
if (mxmlElementGetAttr(tree, "type") == NULL) {
mxmlDelete(tree);
return -1;
}
if (strcmp("counter", mxmlElementGetAttr(tree, "type")) != 0) {
mxmlDelete(tree);
return -1;
}
/* get and set <pkts>. Is not mandatory*/
node = mxmlFindElement(tree, tree, "pkts", NULL, NULL,
MXML_DESCEND_FIRST);
if (node != NULL) {
tmp = strtoull(node->child->value.opaque, &endptr, 10);
if (tmp == UINT64_MAX || tmp < 0 || *endptr ) {
mxmlDelete(tree);
return -1;
}
ctr->pkts = tmp;
e->flags |= (1 << NFT_EXPR_CTR_PACKETS);
}
/* get and set <bytes> */
node = mxmlFindElement(tree, tree, "bytes", NULL, NULL,
MXML_DESCEND);
if (node != NULL) {
tmp = strtoull(node->child->value.opaque, &endptr, 10);
if (tmp == UINT64_MAX || tmp < 0 || *endptr) {
mxmlDelete(tree);
return -1;
}
ctr->bytes = tmp;
e->flags |= (1 << NFT_EXPR_CTR_BYTES);
}
mxmlDelete(tree);
return 0;
#else
errno = EOPNOTSUPP;
return -1;
#endif
}
static int
nft_rule_expr_counter_snprintf(char *buf, size_t len, uint32_t type,
uint32_t flags, struct nft_rule_expr *e)
{
struct nft_expr_counter *ctr = (struct nft_expr_counter *)e->data;
switch(type) {
case NFT_RULE_O_XML:
return snprintf(buf, len, "<pkts>%lu</pkts><bytes>%lu</bytes>",
ctr->pkts, ctr->bytes);
case NFT_RULE_O_DEFAULT:
return snprintf(buf, len, "pkts=%lu bytes=%lu ",
ctr->pkts, ctr->bytes);
default:
break;
}
return -1;
}
struct expr_ops expr_ops_counter = {
.name = "counter",
.alloc_len = sizeof(struct nft_expr_counter),
.max_attr = NFTA_COUNTER_MAX,
.set = nft_rule_expr_counter_set,
.get = nft_rule_expr_counter_get,
.parse = nft_rule_expr_counter_parse,
.build = nft_rule_expr_counter_build,
.snprintf = nft_rule_expr_counter_snprintf,
.xml_parse = nft_rule_expr_counter_xml_parse,
};
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