/** Initialize the firewall rules
*/
int
iptables_fw_init(void)
{
const s_config *config;
char *ext_interface = NULL;
int gw_port = 0;
t_trusted_mac *p;
int proxy_port;
fw_quiet = 0;
LOCK_CONFIG();
config = config_get_config();
gw_port = config->gw_port;
if (config->external_interface) {
ext_interface = safe_strdup(config->external_interface);
} else {
ext_interface = get_ext_iface();
}
if (ext_interface == NULL) {
UNLOCK_CONFIG();
debug(LOG_ERR, "FATAL: no external interface");
return 0;
}
/*
*
* Everything in the MANGLE table
*
*/
/* Create new chains */
iptables_do_command("-t mangle -N " CHAIN_TRUSTED);
iptables_do_command("-t mangle -N " CHAIN_OUTGOING);
iptables_do_command("-t mangle -N " CHAIN_INCOMING);
/* Assign links and rules to these new chains */
iptables_do_command("-t mangle -I PREROUTING 1 -i %s -j " CHAIN_OUTGOING, config->gw_interface);
iptables_do_command("-t mangle -I PREROUTING 1 -i %s -j " CHAIN_TRUSTED, config->gw_interface); //this rule will be inserted before the prior one
iptables_do_command("-t mangle -I POSTROUTING 1 -o %s -j " CHAIN_INCOMING, config->gw_interface);
for (p = config->trustedmaclist; p != NULL; p = p->next)
iptables_do_command("-t mangle -A " CHAIN_TRUSTED " -m mac --mac-source %s -j MARK --set-mark %d", p->mac,
FW_MARK_KNOWN);
/*
*
* Everything in the NAT table
*
*/
/* Create new chains */
iptables_do_command("-t nat -N " CHAIN_OUTGOING);
iptables_do_command("-t nat -N " CHAIN_TO_ROUTER);
iptables_do_command("-t nat -N " CHAIN_TO_INTERNET);
iptables_do_command("-t nat -N " CHAIN_GLOBAL);
iptables_do_command("-t nat -N " CHAIN_UNKNOWN);
iptables_do_command("-t nat -N " CHAIN_AUTHSERVERS);
/* Assign links and rules to these new chains */
iptables_do_command("-t nat -A PREROUTING -i %s -j " CHAIN_OUTGOING, config->gw_interface);
iptables_do_command("-t nat -A " CHAIN_OUTGOING " -d %s -j " CHAIN_TO_ROUTER, config->gw_address);
iptables_do_command("-t nat -A " CHAIN_TO_ROUTER " -j ACCEPT");
iptables_do_command("-t nat -A " CHAIN_OUTGOING " -j " CHAIN_TO_INTERNET);
if ((proxy_port = config_get_config()->proxy_port) != 0) {
debug(LOG_DEBUG, "Proxy port set, setting proxy rule");
iptables_do_command("-t nat -A " CHAIN_TO_INTERNET
" -p tcp --dport 80 -m mark --mark 0x%u -j REDIRECT --to-port %u", FW_MARK_KNOWN,
proxy_port);
iptables_do_command("-t nat -A " CHAIN_TO_INTERNET
" -p tcp --dport 80 -m mark --mark 0x%u -j REDIRECT --to-port %u", FW_MARK_PROBATION,
proxy_port);
}
iptables_do_command("-t nat -A " CHAIN_TO_INTERNET " -m mark --mark 0x%u -j ACCEPT", FW_MARK_KNOWN);
iptables_do_command("-t nat -A " CHAIN_TO_INTERNET " -m mark --mark 0x%u -j ACCEPT", FW_MARK_PROBATION);
iptables_do_command("-t nat -A " CHAIN_TO_INTERNET " -j " CHAIN_UNKNOWN);
iptables_do_command("-t nat -A " CHAIN_UNKNOWN " -j " CHAIN_AUTHSERVERS);
iptables_do_command("-t nat -A " CHAIN_UNKNOWN " -j " CHAIN_GLOBAL);
iptables_do_command("-t nat -A " CHAIN_UNKNOWN " -p tcp --dport 80 -j REDIRECT --to-ports %d", gw_port);
/*
*
* Everything in the FILTER table
*
*/
/* Create new chains */
iptables_do_command("-t filter -N " CHAIN_TO_INTERNET);
iptables_do_command("-t filter -N " CHAIN_AUTHSERVERS);
iptables_do_command("-t filter -N " CHAIN_LOCKED);
iptables_do_command("-t filter -N " CHAIN_GLOBAL);
iptables_do_command("-t filter -N " CHAIN_VALIDATE);
iptables_do_command("-t filter -N " CHAIN_KNOWN);
iptables_do_command("-t filter -N " CHAIN_UNKNOWN);
/* Assign links and rules to these new chains */
/* Insert at the beginning */
iptables_do_command("-t filter -I FORWARD -i %s -j " CHAIN_TO_INTERNET, config->gw_interface);
iptables_do_command("-t filter -A " CHAIN_TO_INTERNET " -m state --state INVALID -j DROP");
/* XXX: Why this? it means that connections setup after authentication
stay open even after the connection is done...
iptables_do_command("-t filter -A " CHAIN_TO_INTERNET " -m state --state RELATED,ESTABLISHED -j ACCEPT"); */
//Won't this rule NEVER match anyway?!?!? benoitg, 2007-06-23
//iptables_do_command("-t filter -A " CHAIN_TO_INTERNET " -i %s -m state --state NEW -j DROP", ext_interface);
/* TCPMSS rule for PPPoE */
iptables_do_command("-t filter -A " CHAIN_TO_INTERNET
" -o %s -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu", ext_interface);
iptables_do_command("-t filter -A " CHAIN_TO_INTERNET " -j " CHAIN_AUTHSERVERS);
iptables_fw_set_authservers();
iptables_do_command("-t filter -A " CHAIN_TO_INTERNET " -m mark --mark 0x%u -j " CHAIN_LOCKED, FW_MARK_LOCKED);
iptables_load_ruleset("filter", FWRULESET_LOCKED_USERS, CHAIN_LOCKED);
iptables_do_command("-t filter -A " CHAIN_TO_INTERNET " -j " CHAIN_GLOBAL);
iptables_load_ruleset("filter", FWRULESET_GLOBAL, CHAIN_GLOBAL);
iptables_load_ruleset("nat", FWRULESET_GLOBAL, CHAIN_GLOBAL);
iptables_do_command("-t filter -A " CHAIN_TO_INTERNET " -m mark --mark 0x%u -j " CHAIN_VALIDATE, FW_MARK_PROBATION);
iptables_load_ruleset("filter", FWRULESET_VALIDATING_USERS, CHAIN_VALIDATE);
iptables_do_command("-t filter -A " CHAIN_TO_INTERNET " -m mark --mark 0x%u -j " CHAIN_KNOWN, FW_MARK_KNOWN);
iptables_load_ruleset("filter", FWRULESET_KNOWN_USERS, CHAIN_KNOWN);
iptables_do_command("-t filter -A " CHAIN_TO_INTERNET " -j " CHAIN_UNKNOWN);
iptables_load_ruleset("filter", FWRULESET_UNKNOWN_USERS, CHAIN_UNKNOWN);
iptables_do_command("-t filter -A " CHAIN_UNKNOWN " -j REJECT --reject-with icmp-port-unreachable");
UNLOCK_CONFIG();
free(ext_interface);
return 1;
}
int
iptables_fw_init(void)
{
const s_config *config;
char * ext_interface = NULL; // 获取WAN口名称
int gw_port = 0;
t_trusted_mac *p;
fw_quiet = 0;
LOCK_CONFIG();
config = config_get_config();
gw_port = config->gw_port;
if (config->external_interface) {
ext_interface = safe_strdup(config->external_interface);
} else {
ext_interface = get_ext_iface(); // 获取WAN口名称
}
if (ext_interface == NULL) {
UNLOCK_CONFIG();
debug(LOG_ERR, "FATAL: no external interface");
return 0;
}
/*
*
* Everything in the MANGLE table
*
*/
/* Create new chains */// 创建自定义规则链
// modified by lijg, 2013-05-17, 取消打标记
//iptables_do_command("-t mangle -N " TABLE_WIFIDOG_TRUSTED);
IPT_DO_CMMD("-t mangle -N " TABLE_WIFIDOG_OUTGOING);
IPT_DO_CMMD("-t mangle -N " TABLE_WIFIDOG_INCOMING);
/* Assign links and rules to these new chains */
// modified by lijg, 2013-04-24, avoid confliting with QoS
IPT_DO_CMMD("-t mangle -I PREROUTING 1 -i %s -j " TABLE_WIFIDOG_OUTGOING, config->gw_interface);
//iptables_do_command("-t mangle -I PREROUTING 1 -i %s -j " TABLE_WIFIDOG_TRUSTED, config->gw_interface);//this rule will be inserted before the prior one
IPT_DO_CMMD("-t mangle -I POSTROUTING 1 -o %s -j " TABLE_WIFIDOG_INCOMING, config->gw_interface);
// modified by lijg, 2013-05-17, avoid confliting with QoS
//for (p = config->trustedmaclist; p != NULL; p = p->next)
// iptables_do_command("-t mangle -A " TABLE_WIFIDOG_TRUSTED " -m mac --mac-source %s -j MARK --or-mark %d", p->mac, FW_MARK_KNOWN);
/*
*
* Everything in the NAT table
*
*/
/* Create new chains */
IPT_DO_CMMD("-t nat -N " TABLE_WIFIDOG_OUTGOING);
IPT_DO_CMMD("-t nat -N " TABLE_WIFIDOG_WIFI_TO_ROUTER);
IPT_DO_CMMD("-t nat -N " TABLE_WIFIDOG_WIFI_TO_INTERNET);
IPT_DO_CMMD("-t nat -N " TABLE_WIFIDOG_GLOBAL);
IPT_DO_CMMD("-t nat -N " TABLE_WIFIDOG_UNKNOWN);
IPT_DO_CMMD("-t nat -N " TABLE_WIFIDOG_AUTHSERVERS);
// add by lijg, 2013-08-14, create chains for white list
IPT_DO_CMMD("-t nat -N " TABLE_WIFIDOG_WLIST);
/* Assign links and rules to these new chains */
IPT_DO_CMMD("-t nat -A PREROUTING -i %s -j " TABLE_WIFIDOG_OUTGOING, config->gw_interface);
IPT_DO_CMMD("-t nat -A " TABLE_WIFIDOG_OUTGOING " -d %s -j " TABLE_WIFIDOG_WIFI_TO_ROUTER, config->gw_address);
IPT_DO_CMMD("-t nat -A " TABLE_WIFIDOG_WIFI_TO_ROUTER " -j ACCEPT");
IPT_DO_CMMD("-t nat -A " TABLE_WIFIDOG_OUTGOING " -j " TABLE_WIFIDOG_WIFI_TO_INTERNET);
// modified by lijg, 2013-04-24, match mark mask = ff00
IPT_DO_CMMD("-t nat -A " TABLE_WIFIDOG_WIFI_TO_INTERNET " -m mark --mark 0x%04x/0xff00 -j ACCEPT", FW_MARK_KNOWN);
IPT_DO_CMMD("-t nat -A " TABLE_WIFIDOG_WIFI_TO_INTERNET " -m mark --mark 0x%04x/0xff00 -j ACCEPT", FW_MARK_PROBATION);
// add by lijg, 2013-08-14, add a white list chain
IPT_DO_CMMD("-t nat -A " TABLE_WIFIDOG_WIFI_TO_INTERNET " -j " TABLE_WIFIDOG_WLIST);
IPT_DO_CMMD("-t nat -A " TABLE_WIFIDOG_WIFI_TO_INTERNET " -j " TABLE_WIFIDOG_UNKNOWN);
IPT_DO_CMMD("-t nat -A " TABLE_WIFIDOG_UNKNOWN " -j " TABLE_WIFIDOG_AUTHSERVERS);
// modified by lijg, 2013-05-17, 取消该规则
//iptables_do_command("-t nat -A " TABLE_WIFIDOG_UNKNOWN " -j " TABLE_WIFIDOG_GLOBAL);
IPT_DO_CMMD("-t nat -A " TABLE_WIFIDOG_UNKNOWN " -p tcp --dport 80 -j REDIRECT --to-ports %d", gw_port);
/*
*
* Everything in the FILTER table
*
*/
/* Create new chains */
IPT_DO_CMMD("-t filter -N " TABLE_WIFIDOG_WIFI_TO_INTERNET);
IPT_DO_CMMD("-t filter -N " TABLE_WIFIDOG_AUTHSERVERS);
IPT_DO_CMMD("-t filter -N " TABLE_WIFIDOG_LOCKED);
IPT_DO_CMMD("-t filter -N " TABLE_WIFIDOG_GLOBAL);
IPT_DO_CMMD("-t filter -N " TABLE_WIFIDOG_VALIDATE);
IPT_DO_CMMD("-t filter -N " TABLE_WIFIDOG_KNOWN);
IPT_DO_CMMD("-t filter -N " TABLE_WIFIDOG_UNKNOWN);
// add by lijg, 2013-08-14, create chains for white list
IPT_DO_CMMD("-t filter -N " TABLE_WIFIDOG_WLIST);
/* Assign links and rules to these new chains */
/* Insert at the beginning */
IPT_DO_CMMD("-t filter -I FORWARD -i %s -j " TABLE_WIFIDOG_WIFI_TO_INTERNET, config->gw_interface);
//IPT_DO_CMMD("-t filter -A " TABLE_WIFIDOG_WIFI_TO_INTERNET " -m state --state INVALID -j DROP");
/* XXX: Why this? it means that connections setup after authentication
stay open even after the connection is done...
iptables_do_command("-t filter -A " TABLE_WIFIDOG_WIFI_TO_INTERNET " -m state --state RELATED,ESTABLISHED -j ACCEPT");*/
//Won't this rule NEVER match anyway?!?!? benoitg, 2007-06-23
//iptables_do_command("-t filter -A " TABLE_WIFIDOG_WIFI_TO_INTERNET " -i %s -m state --state NEW -j DROP", ext_interface);
/* TCPMSS rule for PPPoE */
// modified by lijg, 2013-05-28, cancel this fw rule , repeated in openwrt FW rules
//iptables_do_command("-t filter -A " TABLE_WIFIDOG_WIFI_TO_INTERNET " -o %s -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu", ext_interface);
IPT_DO_CMMD("-t filter -A " TABLE_WIFIDOG_WIFI_TO_INTERNET " -j " TABLE_WIFIDOG_AUTHSERVERS);
iptables_fw_set_authservers();
// modified by lijg, 2013-05-17, 取消匹配标记
//iptables_do_command("-t filter -A " TABLE_WIFIDOG_WIFI_TO_INTERNET " -m mark --mark 0x%04x/0xff00 -j " TABLE_WIFIDOG_LOCKED, FW_MARK_LOCKED);
//iptables_load_ruleset("filter", "locked-users", TABLE_WIFIDOG_LOCKED);
//iptables_do_command("-t filter -A " TABLE_WIFIDOG_WIFI_TO_INTERNET " -j " TABLE_WIFIDOG_GLOBAL);
//iptables_load_ruleset("filter", "global", TABLE_WIFIDOG_GLOBAL);
//iptables_load_ruleset("nat", "global", TABLE_WIFIDOG_GLOBAL);
// modified by lijg, 2013-05-17, 取消该规则
IPT_DO_CMMD("-t filter -A " TABLE_WIFIDOG_WIFI_TO_INTERNET " -m mark --mark 0x%04x/0xff00 -j " TABLE_WIFIDOG_VALIDATE, FW_MARK_PROBATION);
iptables_load_ruleset("filter", "validating-users", TABLE_WIFIDOG_VALIDATE);
// add by lijg, 2013-08-14, add a white list chain
IPT_DO_CMMD("-t filter -A " TABLE_WIFIDOG_WIFI_TO_INTERNET " -j " TABLE_WIFIDOG_WLIST);
// modified by lijg, 2013-05-17, 取消打标记
IPT_DO_CMMD("-t filter -A " TABLE_WIFIDOG_WIFI_TO_INTERNET " -m mark --mark 0x%04x/0xff00 -j " TABLE_WIFIDOG_KNOWN, FW_MARK_KNOWN);
iptables_load_ruleset("filter", "known-users", TABLE_WIFIDOG_KNOWN);
IPT_DO_CMMD("-t filter -A " TABLE_WIFIDOG_WIFI_TO_INTERNET " -j " TABLE_WIFIDOG_UNKNOWN);
iptables_load_ruleset("filter", "unknown-users", TABLE_WIFIDOG_UNKNOWN);
IPT_DO_CMMD("-t filter -A " TABLE_WIFIDOG_UNKNOWN " -j REJECT --reject-with icmp-port-unreachable");
// add by lijg, 2013-08-14, Load wwlist config rule
load_wwlist_conf("/etc/config/wwlist");
UNLOCK_CONFIG();
// add by lijg, 2013-05-17,
free(ext_interface);
return 1;
}