4 files changed, 40 insertions, 7 deletions
diff --git a/accel-pppd/accel-ppp.conf b/accel-pppd/accel-ppp.conf
index 929402b..530c341 100644
--- a/accel-pppd/accel-ppp.conf
+++ b/accel-pppd/accel-ppp.conf
@@ -40,6 +40,7 @@ thread-count=4
 #sid-case=upper
 #sid-source=seq
 #max-sessions=1000
+#check-ip=0
 
 [ppp]
 verbose=1
@@ -49,7 +50,6 @@ mru=1400
 #accomp=deny
 #pcomp=deny
 #ccp=0
-#check-ip=0
 #mppe=require
 ipv4=require
 ipv6=deny
diff --git a/accel-pppd/accel-ppp.conf.5 b/accel-pppd/accel-ppp.conf.5
index 15becb3..52cd1e6 100644
--- a/accel-pppd/accel-ppp.conf.5
+++ b/accel-pppd/accel-ppp.conf.5
@@ -122,6 +122,9 @@ Path to file for sessions sequence number. Start sequence number may be set ther
 .TP
 .BI "max-sessions=" n
 Specifies maximum sessions which server may processed (default 0, disabled)
+.TP
+.BI "check-ip=" 0|1
+Specifies whether accel-ppp should check if IP already assigned to other ppp interface (default 0).
 .SH [ppp]
 .br
 PPP module configuration.
@@ -159,9 +162,6 @@ Protocol field compression negotiation.
 .BI "ccp=" n
 Disable CCP negotiation if this parameter is zero.
 .TP
-.BI "check-ip=" 0|1
-Specifies whether accel-ppp should check if IP already assigned to other ppp interface (default 0).
-.TP
 .BI "mppe=" require|prefer|deny
 Specifies mppe negotiation preference.
 .br
diff --git a/accel-pppd/ctrl/ipoe/ipoe.c b/accel-pppd/ctrl/ipoe/ipoe.c
index 5438b61..9880162 100644
--- a/accel-pppd/ctrl/ipoe/ipoe.c
+++ b/accel-pppd/ctrl/ipoe/ipoe.c
@@ -107,6 +107,7 @@ struct local_net {
 
 enum {SID_MAC, SID_IP};
 
+static int conf_check_exists;
 static int conf_dhcpv4 = 1;
 static int conf_up;
 static int conf_auto;
@@ -577,6 +578,24 @@ static int ipoe_create_interface(struct ipoe_session *ses)
 	return 0;
 }
 
+static int check_exists(struct ipoe_session *self_ipoe, in_addr_t addr)
+{
+	struct ap_session *ses;
+	int r = 0;
+
+	pthread_rwlock_rdlock(&ses_lock);
+	list_for_each_entry(ses, &ses_list, entry) {
+		if (!ses->terminating && ses->ipv4 && ses->ipv4->peer_addr == addr && ses != &self_ipoe->ses) {
+			log_ppp_warn("ipoe: IPv4 address already assigned to %s\n", ses->ifname);
+			r = 1;
+			break;
+		}
+	}
+	pthread_rwlock_unlock(&ses_lock);
+
+	return r;
+}
+
 static void auth_result(struct ipoe_session *ses, int r)
 {
 	char *username = ses->username;
@@ -617,6 +636,11 @@ static void auth_result(struct ipoe_session *ses, int r)
 	ap_session_set_username(&ses->ses, username);
 	log_ppp_info1("%s: authentication succeeded\n", ses->ses.username);
 
+	if (conf_check_exists && check_exists(ses, ses->yiaddr)){
+		ap_session_terminate(&ses->ses, TERM_NAS_REQUEST, 1);
+		return;
+	}
+
 cont:
 	triton_event_fire(EV_SES_AUTHORIZED, &ses->ses);
 
@@ -3930,6 +3954,10 @@ static void load_config(void)
 	else
 		conf_weight = 0;
 
+	opt = conf_get_opt("common", "check-ip");
+	if (opt && atoi(opt) >= 0)
+		conf_check_exists = atoi(opt) > 0;
+
 #ifdef RADIUS
 	if (triton_module_loaded("radius"))
 		load_radius_attrs();
diff --git a/accel-pppd/ppp/ipcp_opt_ipaddr.c b/accel-pppd/ppp/ipcp_opt_ipaddr.c
index 7bac55b..03eb418 100644
--- a/accel-pppd/ppp/ipcp_opt_ipaddr.c
+++ b/accel-pppd/ppp/ipcp_opt_ipaddr.c
@@ -171,9 +171,14 @@ static void load_config(void)
 {
 	const char *opt;
 
-	opt = conf_get_opt("ppp", "check-ip");
-	if (opt && atoi(opt) >= 0)
-		conf_check_exists = atoi(opt) > 0;
+	opt = conf_get_opt("common", "check-ip");
+	if (opt && atoi(opt) > 0)
+		conf_check_exists = atoi(opt);
+	else {
+		opt = conf_get_opt("ppp", "check-ip");
+		if (opt && atoi(opt) >= 0)
+			conf_check_exists = atoi(opt) > 0;
+	}
 }
 
 static void ipaddr_opt_init()