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/*
* Conntrack expression related definitions and types.
*
* Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Development of this code funded by Astaro AG (http://www.astaro.com/)
*/
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <linux/netfilter/nf_tables.h>
#include <linux/netfilter/nf_conntrack_common.h>
#include <linux/netfilter/nf_conntrack_tuple_common.h>
#include <expression.h>
#include <datatype.h>
#include <ct.h>
#include <gmputil.h>
#include <utils.h>
static const struct symbol_table ct_state_tbl = {
.symbols = {
SYMBOL("invalid", NF_CT_STATE_INVALID_BIT),
SYMBOL("new", NF_CT_STATE_BIT(IP_CT_NEW)),
SYMBOL("established", NF_CT_STATE_BIT(IP_CT_ESTABLISHED)),
SYMBOL("related", NF_CT_STATE_BIT(IP_CT_RELATED)),
SYMBOL("untracked", NF_CT_STATE_UNTRACKED_BIT),
SYMBOL_LIST_END
}
};
static const struct datatype ct_state_type = {
.type = TYPE_CT_STATE,
.name = "ct_state",
.desc = "conntrack state",
.byteorder = BYTEORDER_HOST_ENDIAN,
.size = 4 * BITS_PER_BYTE,
.basetype = &bitmask_type,
.sym_tbl = &ct_state_tbl,
};
static const struct symbol_table ct_dir_tbl = {
.symbols = {
SYMBOL("original", IP_CT_DIR_ORIGINAL),
SYMBOL("reply", IP_CT_DIR_REPLY),
SYMBOL_LIST_END
}
};
static const struct datatype ct_dir_type = {
.type = TYPE_CT_DIR,
.name = "ct_dir",
.desc = "conntrack direction",
.byteorder = BYTEORDER_INVALID,
.size = BITS_PER_BYTE,
.basetype = &bitmask_type,
.sym_tbl = &ct_dir_tbl,
};
static const struct symbol_table ct_status_tbl = {
/*
* There are more, but most of them don't make sense for filtering.
*/
.symbols = {
SYMBOL("expected", IPS_EXPECTED),
SYMBOL("seen-reply", IPS_SEEN_REPLY),
SYMBOL("assured", IPS_ASSURED),
SYMBOL("confirmed", IPS_CONFIRMED),
SYMBOL("snat", IPS_SRC_NAT),
SYMBOL("dnat", IPS_DST_NAT),
SYMBOL("dying", IPS_DYING),
SYMBOL_LIST_END
},
};
static const struct datatype ct_status_type = {
.type = TYPE_CT_STATUS,
.name = "ct_status",
.desc = "conntrack status",
.byteorder = BYTEORDER_HOST_ENDIAN,
.size = 4 * BITS_PER_BYTE,
.basetype = &bitmask_type,
.sym_tbl = &ct_status_tbl,
};
static const struct ct_template ct_templates[] = {
[NFT_CT_STATE] = CT_TEMPLATE("state", &ct_state_type,
BYTEORDER_HOST_ENDIAN,
4 * BITS_PER_BYTE),
[NFT_CT_DIRECTION] = CT_TEMPLATE("direction", &ct_dir_type,
BYTEORDER_HOST_ENDIAN,
BITS_PER_BYTE),
[NFT_CT_STATUS] = CT_TEMPLATE("status", &ct_status_type,
BYTEORDER_HOST_ENDIAN,
4 * BITS_PER_BYTE),
[NFT_CT_MARK] = CT_TEMPLATE("mark", &mark_type,
BYTEORDER_HOST_ENDIAN,
4 * BITS_PER_BYTE),
[NFT_CT_EXPIRATION] = CT_TEMPLATE("expiration", &time_type,
BYTEORDER_HOST_ENDIAN,
4 * BITS_PER_BYTE),
[NFT_CT_HELPER] = CT_TEMPLATE("helper", &string_type,
BYTEORDER_HOST_ENDIAN, 0),
[NFT_CT_L3PROTOCOL] = CT_TEMPLATE("l3proto", &invalid_type,
BYTEORDER_INVALID,
BITS_PER_BYTE),
[NFT_CT_SRC] = CT_TEMPLATE("saddr", &invalid_type,
BYTEORDER_BIG_ENDIAN, 0),
[NFT_CT_DST] = CT_TEMPLATE("daddr", &invalid_type,
BYTEORDER_BIG_ENDIAN, 0),
[NFT_CT_PROTOCOL] = CT_TEMPLATE("protocol", &inet_protocol_type,
BYTEORDER_BIG_ENDIAN,
BITS_PER_BYTE),
[NFT_CT_PROTO_SRC] = CT_TEMPLATE("proto-src", &invalid_type,
BYTEORDER_BIG_ENDIAN,
2 * BITS_PER_BYTE),
[NFT_CT_PROTO_DST] = CT_TEMPLATE("proto-dst", &invalid_type,
BYTEORDER_BIG_ENDIAN,
2 * BITS_PER_BYTE),
};
static void ct_expr_print(const struct expr *expr)
{
printf("ct %s", ct_templates[expr->ct.key].token);
}
static void ct_expr_clone(struct expr *new, const struct expr *expr)
{
new->ct.key = expr->ct.key;
}
static void ct_expr_pctx_update(struct proto_ctx *ctx, const struct expr *expr)
{
const struct expr *left = expr->left, *right = expr->right;
const struct proto_desc *base, *desc;
assert(expr->op == OP_EQ);
switch (left->ct.key) {
case NFT_CT_PROTOCOL:
base = ctx->protocol[PROTO_BASE_NETWORK_HDR].desc;
desc = proto_find_upper(base, mpz_get_uint32(right->value));
proto_ctx_update(ctx, PROTO_BASE_TRANSPORT_HDR,
&expr->location, desc);
break;
default:
break;
}
}
static const struct expr_ops ct_expr_ops = {
.type = EXPR_CT,
.name = "ct",
.print = ct_expr_print,
.clone = ct_expr_clone,
.pctx_update = ct_expr_pctx_update,
};
struct expr *ct_expr_alloc(const struct location *loc, enum nft_ct_keys key)
{
const struct ct_template *tmpl = &ct_templates[key];
struct expr *expr;
expr = expr_alloc(loc, &ct_expr_ops, tmpl->dtype,
tmpl->byteorder, tmpl->len);
expr->ct.key = key;
switch (key) {
case NFT_CT_PROTOCOL:
expr->flags = EXPR_F_PROTOCOL;
break;
default:
break;
}
return expr;
}
void ct_expr_update_type(struct proto_ctx *ctx, struct expr *expr)
{
const struct proto_desc *desc;
switch (expr->ct.key) {
case NFT_CT_SRC:
case NFT_CT_DST:
desc = ctx->protocol[PROTO_BASE_NETWORK_HDR].desc;
if (desc == &proto_ip)
expr->dtype = &ipaddr_type;
else if (desc == &proto_ip6)
expr->dtype = &ip6addr_type;
expr->len = expr->dtype->size;
break;
case NFT_CT_PROTO_SRC:
case NFT_CT_PROTO_DST:
desc = ctx->protocol[PROTO_BASE_TRANSPORT_HDR].desc;
if (desc == NULL)
break;
expr->dtype = &inet_service_type;
break;
default:
break;
}
}
static void __init ct_init(void)
{
datatype_register(&ct_state_type);
datatype_register(&ct_dir_type);
datatype_register(&ct_status_type);
}
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