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l2tp-clid-patch.txt
aserkin (Alexander Serkin)
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Authored By
aserkin
Nov 18 2022, 17:40
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l2tp-clid-patch.txt
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--- l2tp.c.orig 2022-09-19 16:38:21.476232867 +0300
+++ l2tp.c 2022-10-04 15:37:55.253938369 +0300
@@ -123,6 +123,11 @@
struct l2tp_conn_t *paren_conn;
uint16_t sid;
uint16_t peer_sid;
+/* We will keep l2tp attributes Calling-Number/Called-Number and their length while the session exists */
+ char *calling_num;
+ int calling_num_len;
+ char *called_num;
+ int called_num_len;
unsigned int ref_count;
int state1;
@@ -979,6 +984,10 @@
_free(sess->ctrl.calling_station_id);
if (sess->ctrl.called_station_id)
_free(sess->ctrl.called_station_id);
+ if (sess->calling_num)
+ _free(sess->calling_num);
+ if (sess->called_num)
+ _free(sess->called_num);
log_session(log_info2, sess, "session destroyed\n");
@@ -1771,25 +1780,52 @@
sess->ctrl.max_mtu = conf_ppp_max_mtu;
sess->ctrl.mppe = conf_mppe;
- sess->ctrl.calling_station_id = _malloc(17);
- if (sess->ctrl.calling_station_id == NULL) {
- log_session(log_error, sess,
- "impossible to start data channel:"
- " allocation of calling station ID failed\n");
- goto err;
+ /* If l2tp calling number avp exists, we use it, otherwise we use lac ip */
+ if (sess->calling_num != NULL) {
+ sess->ctrl.calling_station_id = _malloc(sess->calling_num_len+1);
+ if (sess->ctrl.calling_station_id == NULL) {
+ log_session(log_error, sess,
+ "impossible to start data channel:"
+ " allocation of calling station ID failed\n");
+ goto err;
+ }else {
+ strcpy(sess->ctrl.calling_station_id, sess->calling_num);
+ }
+ } else {
+ sess->ctrl.calling_station_id = _malloc(17);
+ if (sess->ctrl.calling_station_id == NULL) {
+ log_session(log_error, sess,
+ "impossible to start data channel:"
+ " allocation of calling station ID failed\n");
+ goto err;
+ } else {
+ u_inet_ntoa(sess->paren_conn->peer_addr.sin_addr.s_addr,
+ sess->ctrl.calling_station_id);
+ }
}
- u_inet_ntoa(sess->paren_conn->peer_addr.sin_addr.s_addr,
- sess->ctrl.calling_station_id);
-
- sess->ctrl.called_station_id = _malloc(17);
- if (sess->ctrl.called_station_id == NULL) {
- log_session(log_error, sess,
- "impossible to start data channel:"
- " allocation of called station ID failed\n");
- goto err;
+ /* If l2tp called number avp exists, we use it, otherwise we use my ip */
+ if (sess->called_num != NULL) {
+ sess->ctrl.called_station_id = _malloc(sess->called_num_len+1);
+ if (sess->ctrl.called_station_id == NULL) {
+ log_session(log_error, sess,
+ "impossible to start data channel:"
+ " allocation of called station ID failed\n");
+ goto err;
+ } else {
+ strcpy(sess->ctrl.called_station_id, sess->called_num);
+ }
+ } else {
+ sess->ctrl.called_station_id = _malloc(17);
+ if (sess->ctrl.called_station_id == NULL) {
+ log_session(log_error, sess,
+ "impossible to start data channel:"
+ " allocation of called station ID failed\n");
+ goto err;
+ } else {
+ u_inet_ntoa(sess->paren_conn->host_addr.sin_addr.s_addr,
+ sess->ctrl.called_station_id);
+ }
}
- u_inet_ntoa(sess->paren_conn->host_addr.sin_addr.s_addr,
- sess->ctrl.called_station_id);
if (conf_ip_pool) {
sess->ppp.ses.ipv4_pool_name = _strdup(conf_ip_pool);
@@ -3295,6 +3331,10 @@
uint16_t sid = 0;
uint16_t res = 0;
uint16_t err = 0;
+ uint8_t *calling[254] = {0};
+ uint8_t *called[254] = {0};
+ int n = 0;
+ int m = 0;
if (conn->state != STATE_ESTB && conn->lns_mode) {
log_tunnel(log_warn, conn, "discarding unexpected ICRQ\n");
@@ -3332,7 +3372,17 @@
case Call_Serial_Number:
case Bearer_Type:
case Calling_Number:
+ /* Save Calling-Number L2TP attribute locally */
+ if (attr->attr->id == Calling_Number) {
+ n = attr->length;
+ memcpy(calling,attr->val.octets,n);
+ }
case Called_Number:
+ /* Save Called-Number L2TP attribute locally */
+ if (attr->attr->id == Called_Number) {
+ m = attr->length;
+ memcpy(called,attr->val.octets,m);
+ }
case Sub_Address:
case Physical_Channel_ID:
break;
@@ -3371,6 +3421,30 @@
sess->peer_sid = peer_sid;
sid = sess->sid;
+ /* Allocate memory for Calling-Number if exists, and put it to l2tp_sess_t structure */
+ if (calling != NULL && n > 0) {
+ sess->calling_num = _malloc(n+1);
+ if (sess->calling_num == NULL) {
+ log_tunnel(log_warn, conn, "can't allocate memory for Calling Number attribute. Will use LAC IP instead\n");
+ }else{
+ memcpy(sess->calling_num, calling, n);
+ sess->calling_num[n] = '\0';
+ sess->calling_num_len = n;
+ }
+ }
+
+ /* Allocate memory for Called-Number if exists, and put it to l2tp_sess_t structure */
+ if (called != NULL && m > 1) {
+ sess->called_num = _malloc(m+1);
+ if (sess->called_num == NULL) {
+ log_tunnel(log_warn, conn, "can't allocate memory for Called Number attribute. Will use my IP instead\n");
+ } else {
+ memcpy(sess->called_num, called, m);
+ sess->called_num[m] = '\0';
+ sess->called_num_len = m;
+ }
+ }
+
if (unknown_attr) {
log_tunnel(log_error, conn, "impossible to handle ICRQ:"
" unknown mandatory attribute type %i,"
@@ -3390,8 +3464,8 @@
goto out_reject;
}
- log_tunnel(log_info1, conn, "new session %hu-%hu created following"
- " reception of ICRQ\n", sid, peer_sid);
+ log_tunnel(log_info1, conn, "new session %hu-%hu with calling num %s len %d, called num %s len %d created following"
+ " reception of ICRQ\n", sid, peer_sid, sess->calling_num, sess->calling_num_len, sess->called_num, sess->called_num_len);
return 0;

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l2tp-clid-patch.txt (5 KB)

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