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/*
* fwd - OpenWrt firewall daemon - data structures
*
* Copyright (C) 2009 Jo-Philipp Wich <xm@subsignal.org>
*
* The fwd 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.
*
* The fwd program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with the fwd program. If not, see http://www.gnu.org/licenses/.
*/
#ifndef __FWD_H__
#define __FWD_H__
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdarg.h>
#include <stdlib.h>
#include <getopt.h>
#include <netinet/in.h>
#if 0
#include "fwd_addr.h"
#include "fwd_rules.h"
#include "fwd_config.h"
#endif
enum fwd_policy {
FWD_P_UNSPEC = 0,
FWD_P_DROP = 1,
FWD_P_REJECT = 2,
FWD_P_ACCEPT = 3
};
enum fwd_stype {
FWD_S_DEFAULTS = 0,
FWD_S_ZONE = 1,
FWD_S_FORWARD = 2,
FWD_S_REDIRECT = 3,
FWD_S_RULE = 4,
FWD_S_INCLUDE = 5
};
enum fwd_ptype {
FWD_PR_CUSTOM = 0,
FWD_PR_TCP = 1,
FWD_PR_UDP = 2,
FWD_PR_TCPUDP = 3,
FWD_PR_ICMP = 4,
FWD_PR_ALL = 5
};
struct fwd_portrange {
unsigned short min;
unsigned short max;
};
struct fwd_cidr {
struct in_addr addr;
int prefix;
};
struct fwd_mac {
unsigned char mac[6];
};
struct fwd_proto {
enum fwd_ptype type;
int proto;
};
struct fwd_icmptype {
char name[32];
int type;
int code;
};
struct fwd_network_list {
char *name;
char *ifname;
int isalias;
struct fwd_cidr *addr;
struct fwd_network_list *next;
};
struct fwd_defaults {
enum fwd_policy input;
enum fwd_policy forward;
enum fwd_policy output;
int syn_flood;
int syn_rate;
int syn_burst;
int drop_invalid;
};
struct fwd_zone {
char *name;
struct fwd_network_list *networks;
struct fwd_data *forwardings;
struct fwd_data *redirects;
struct fwd_data *rules;
enum fwd_policy input;
enum fwd_policy forward;
enum fwd_policy output;
int masq;
int mtu_fix;
int conntrack;
};
struct fwd_forwarding {
struct fwd_zone *src;
struct fwd_zone *dest;
int mtu_fix; /* legacy */
int masq; /* new */
};
struct fwd_redirect {
struct fwd_zone *src;
struct fwd_cidr *src_ip;
struct fwd_mac *src_mac;
struct fwd_portrange *src_port;
struct fwd_portrange *src_dport;
struct fwd_cidr *dest_ip;
struct fwd_portrange *dest_port;
struct fwd_proto *proto;
int clone; /* true if rule is cloned (tcpudp -> tcp + udp) */
};
struct fwd_rule {
struct fwd_zone *src;
struct fwd_zone *dest;
struct fwd_cidr *src_ip;
struct fwd_mac *src_mac;
struct fwd_portrange *src_port;
struct fwd_cidr *dest_ip;
struct fwd_portrange *dest_port;
struct fwd_proto *proto;
struct fwd_icmptype *icmp_type;
enum fwd_policy target;
int clone; /* true if rule is cloned (tcpudp -> tcp + udp) */
};
struct fwd_include {
char *path;
};
struct fwd_data {
enum fwd_stype type;
struct fwd_data *next;
union {
struct fwd_defaults defaults;
struct fwd_zone zone;
struct fwd_forwarding forwarding;
struct fwd_redirect redirect;
struct fwd_rule rule;
struct fwd_include include;
} section;
};
struct fwd_handle {
int rtnl_socket;
struct fwd_data *conf;
struct fwd_addr_list *addrs;
};
/* fwd_zmalloc(size_t)
* Allocates a zeroed buffer of the given size. */
static void * fwd_zmalloc(size_t s)
{
void *b = malloc(s);
if( b != NULL )
memset(b, 0, s);
return b;
}
/* fwd_fatal(fmt, ...)
* Prints message to stderr and termintes program. */
#define fwd_fatal(...) do { \
fprintf(stderr, "ERROR: "); \
fprintf(stderr, __VA_ARGS__); \
fprintf(stderr, "\n"); \
exit(1); \
} while(0)
/* fwd_alloc_ptr(type)
* Allocates a buffer with the size of the given datatype
* and returns a pointer to it. */
#define fwd_alloc_ptr(t) (t *) fwd_zmalloc(sizeof(t))
/* fwd_free_ptr(void *)
* Frees the given pointer and sets it to NULL.
* Safe for NULL values. */
#define fwd_free_ptr(x) do { if(x != NULL) free(x); x = NULL; } while(0)
#endif
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