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/*
* (C) 2014 by Arturo Borrero Gonzalez <arturo@debian.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 <stdio.h>
#include <stdint.h>
#include <arpa/inet.h>
#include <errno.h>
#include <inttypes.h>
#include <linux/netfilter/nf_tables.h>
#include "internal.h"
#include <libmnl/libmnl.h>
#include <libnftnl/expr.h>
#include <libnftnl/rule.h>
struct nftnl_expr_masq {
uint32_t flags;
enum nft_registers sreg_proto_min;
enum nft_registers sreg_proto_max;
};
static int
nftnl_expr_masq_set(struct nftnl_expr *e, uint16_t type,
const void *data, uint32_t data_len)
{
struct nftnl_expr_masq *masq = nftnl_expr_data(e);
switch (type) {
case NFTNL_EXPR_MASQ_FLAGS:
memcpy(&masq->flags, data, sizeof(masq->flags));
break;
case NFTNL_EXPR_MASQ_REG_PROTO_MIN:
memcpy(&masq->sreg_proto_min, data, sizeof(masq->sreg_proto_min));
break;
case NFTNL_EXPR_MASQ_REG_PROTO_MAX:
memcpy(&masq->sreg_proto_max, data, sizeof(masq->sreg_proto_max));
break;
default:
return -1;
}
return 0;
}
static const void *
nftnl_expr_masq_get(const struct nftnl_expr *e, uint16_t type,
uint32_t *data_len)
{
struct nftnl_expr_masq *masq = nftnl_expr_data(e);
switch (type) {
case NFTNL_EXPR_MASQ_FLAGS:
*data_len = sizeof(masq->flags);
return &masq->flags;
case NFTNL_EXPR_MASQ_REG_PROTO_MIN:
*data_len = sizeof(masq->sreg_proto_min);
return &masq->sreg_proto_min;
case NFTNL_EXPR_MASQ_REG_PROTO_MAX:
*data_len = sizeof(masq->sreg_proto_max);
return &masq->sreg_proto_max;
}
return NULL;
}
static int nftnl_expr_masq_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_MASQ_MAX) < 0)
return MNL_CB_OK;
switch (type) {
case NFTA_MASQ_REG_PROTO_MIN:
case NFTA_MASQ_REG_PROTO_MAX:
case NFTA_MASQ_FLAGS:
if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
abi_breakage();
break;
}
tb[type] = attr;
return MNL_CB_OK;
}
static void
nftnl_expr_masq_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
{
struct nftnl_expr_masq *masq = nftnl_expr_data(e);
if (e->flags & (1 << NFTNL_EXPR_MASQ_FLAGS))
mnl_attr_put_u32(nlh, NFTA_MASQ_FLAGS, htobe32(masq->flags));
if (e->flags & (1 << NFTNL_EXPR_MASQ_REG_PROTO_MIN))
mnl_attr_put_u32(nlh, NFTA_MASQ_REG_PROTO_MIN,
htobe32(masq->sreg_proto_min));
if (e->flags & (1 << NFTNL_EXPR_MASQ_REG_PROTO_MAX))
mnl_attr_put_u32(nlh, NFTA_MASQ_REG_PROTO_MAX,
htobe32(masq->sreg_proto_max));
}
static int
nftnl_expr_masq_parse(struct nftnl_expr *e, struct nlattr *attr)
{
struct nftnl_expr_masq *masq = nftnl_expr_data(e);
struct nlattr *tb[NFTA_MASQ_MAX+1] = {};
if (mnl_attr_parse_nested(attr, nftnl_expr_masq_cb, tb) < 0)
return -1;
if (tb[NFTA_MASQ_FLAGS]) {
masq->flags = be32toh(mnl_attr_get_u32(tb[NFTA_MASQ_FLAGS]));
e->flags |= (1 << NFTNL_EXPR_MASQ_FLAGS);
}
if (tb[NFTA_MASQ_REG_PROTO_MIN]) {
masq->sreg_proto_min =
be32toh(mnl_attr_get_u32(tb[NFTA_MASQ_REG_PROTO_MIN]));
e->flags |= (1 << NFTNL_EXPR_MASQ_REG_PROTO_MIN);
}
if (tb[NFTA_MASQ_REG_PROTO_MAX]) {
masq->sreg_proto_max =
be32toh(mnl_attr_get_u32(tb[NFTA_MASQ_REG_PROTO_MAX]));
e->flags |= (1 << NFTNL_EXPR_MASQ_REG_PROTO_MAX);
}
return 0;
}
static int nftnl_expr_masq_snprintf(char *buf, size_t remain,
uint32_t flags, const struct nftnl_expr *e)
{
struct nftnl_expr_masq *masq = nftnl_expr_data(e);
int offset = 0, ret = 0;
if (e->flags & (1 << NFTNL_EXPR_MASQ_REG_PROTO_MIN)) {
ret = snprintf(buf + offset, remain, "proto_min reg %u ",
masq->sreg_proto_min);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
if (e->flags & (1 << NFTNL_EXPR_MASQ_REG_PROTO_MAX)) {
ret = snprintf(buf + offset, remain, "proto_max reg %u ",
masq->sreg_proto_max);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
if (e->flags & (1 << NFTNL_EXPR_MASQ_FLAGS)) {
ret = snprintf(buf + offset, remain, "flags 0x%x ", masq->flags);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
return offset;
}
struct expr_ops expr_ops_masq = {
.name = "masq",
.alloc_len = sizeof(struct nftnl_expr_masq),
.max_attr = NFTA_MASQ_MAX,
.set = nftnl_expr_masq_set,
.get = nftnl_expr_masq_get,
.parse = nftnl_expr_masq_parse,
.build = nftnl_expr_masq_build,
.output = nftnl_expr_masq_snprintf,
};
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