diff options
Diffstat (limited to 'accel-pppd/ctrl/l2tp')
| -rw-r--r-- | accel-pppd/ctrl/l2tp/l2tp.c | 76 | ||||
| -rw-r--r-- | accel-pppd/ctrl/l2tp/l2tp.h | 1 |
2 files changed, 69 insertions, 8 deletions
diff --git a/accel-pppd/ctrl/l2tp/l2tp.c b/accel-pppd/ctrl/l2tp/l2tp.c index e8a4ab3..e7b6955 100644 --- a/accel-pppd/ctrl/l2tp/l2tp.c +++ b/accel-pppd/ctrl/l2tp/l2tp.c @@ -108,6 +108,7 @@ struct l2tp_sess_t int reorder_timeout; struct triton_timer_t timeout_timer; + struct list_head send_queue; pthread_mutex_t apses_lock; struct triton_context_t apses_ctx; @@ -433,6 +434,33 @@ static int l2tp_tunnel_checkchallresp(uint8_t msgident, return 0; } +static void l2tp_tunnel_clear_sendqueue(struct l2tp_conn_t *conn) +{ + struct l2tp_packet_t *pack; + + while (!list_empty(&conn->send_queue)) { + pack = list_first_entry(&conn->send_queue, typeof(*pack), + entry); + if (pack->sess_entry.next) + list_del(&pack->sess_entry); + list_del(&pack->entry); + l2tp_packet_free(pack); + } +} + +static void l2tp_session_clear_sendqueue(struct l2tp_sess_t *sess) +{ + struct l2tp_packet_t *pack; + + while (!list_empty(&sess->send_queue)) { + pack = list_first_entry(&sess->send_queue, typeof(*pack), + sess_entry); + list_del(&pack->sess_entry); + list_del(&pack->entry); + l2tp_packet_free(pack); + } +} + static int __l2tp_tunnel_send(const struct l2tp_conn_t *conn, struct l2tp_packet_t *pack) { @@ -537,6 +565,11 @@ static int l2tp_tunnel_push_sendqueue(struct l2tp_conn_t *conn) return -1; } + if (pack->sess_entry.next) { + list_del(&pack->sess_entry); + pack->sess_entry.next = NULL; + pack->sess_entry.prev = NULL; + } list_move_tail(&pack->entry, &conn->rtms_queue); ++conn->Ns; ++pkt_sent; @@ -597,7 +630,12 @@ static int l2tp_session_send(struct l2tp_sess_t *sess, pack->hdr.sid = htons(sess->peer_sid); - return l2tp_tunnel_send(sess->paren_conn, pack); + if (l2tp_tunnel_send(sess->paren_conn, pack) < 0) + return -1; + + list_add_tail(&pack->sess_entry, &sess->send_queue); + + return 0; } static int l2tp_send_StopCCN(struct l2tp_conn_t *conn, @@ -758,6 +796,11 @@ static int l2tp_tunnel_disconnect(struct l2tp_conn_t *conn, return 0; } + /* Discard unsent messages so that StopCCN will be the only one in the + * send queue (to minimise delay in case of congestion). + */ + l2tp_tunnel_clear_sendqueue(conn); + if (l2tp_send_StopCCN(conn, res, err) < 0) { log_tunnel(log_error, conn, "impossible to notify peer of tunnel disconnection:" @@ -871,6 +914,7 @@ static void session_hold(struct l2tp_sess_t *sess) static void l2tp_session_free(struct l2tp_sess_t *sess) { + struct l2tp_packet_t *pack; intptr_t cause = TERM_NAS_REQUEST; int res = 1; @@ -923,6 +967,19 @@ static void l2tp_session_free(struct l2tp_sess_t *sess) if (sess->timeout_timer.tpd) triton_timer_del(&sess->timeout_timer); + /* Packets in the send queue must not reference the session anymore. + * They aren't removed from tunnel's queue because they have to be sent + * even though session is getting destroyed (useless messages are + * dropped from send queues before calling l2tp_session_free()). + */ + while (!list_empty(&sess->send_queue)) { + pack = list_first_entry(&sess->send_queue, typeof(*pack), + sess_entry); + list_del(&pack->sess_entry); + pack->sess_entry.next = NULL; + pack->sess_entry.prev = NULL; + } + if (sess->paren_conn->sessions) { if (!tdelete(sess, &sess->paren_conn->sessions, sess_cmp)) { log_session(log_error, sess, @@ -1015,11 +1072,7 @@ static void l2tp_tunnel_free(struct l2tp_conn_t *conn) list_del(&pack->entry); l2tp_packet_free(pack); } - while (!list_empty(&conn->send_queue)) { - pack = list_entry(conn->send_queue.next, typeof(*pack), entry); - list_del(&pack->entry); - l2tp_packet_free(pack); - } + l2tp_tunnel_clear_sendqueue(conn); if (conn->sessions) l2tp_tunnel_free_sessions(conn); @@ -1036,10 +1089,13 @@ static void l2tp_tunnel_free(struct l2tp_conn_t *conn) static void l2tp_session_disconnect(struct l2tp_sess_t *sess, uint16_t res, uint16_t err) { + /* Session is closing, unsent messages are now useless */ + l2tp_session_clear_sendqueue(sess); + if (l2tp_send_CDN(sess, res, err) < 0) log_session(log_error, sess, - "impossible to notify peer of session" - " disconnection, disconnecting anyway\n"); + "impossible to notify peer of session disconnection:" + " sending CDN failed, deleting session anyway\n"); l2tp_session_free(sess); } @@ -1337,6 +1393,7 @@ static struct l2tp_sess_t *l2tp_tunnel_alloc_session(struct l2tp_conn_t *conn) (conf_dataseq == L2TP_DATASEQ_REQUIRE); sess->recv_seq = (conf_dataseq == L2TP_DATASEQ_REQUIRE); sess->reorder_timeout = conf_reorder_timeout; + INIT_LIST_HEAD(&sess->send_queue); sess->timeout_timer.expire = l2tp_session_timeout; sess->timeout_timer.period = conf_timeout * 1000; @@ -3544,6 +3601,9 @@ static int l2tp_recv_CDN(struct l2tp_sess_t *sess, if (err_msg) _free(err_msg); + /* Too late to send outstanding messages */ + l2tp_session_clear_sendqueue(sess); + l2tp_session_free(sess); return 0; diff --git a/accel-pppd/ctrl/l2tp/l2tp.h b/accel-pppd/ctrl/l2tp/l2tp.h index 9d4dd2c..12a2dbf 100644 --- a/accel-pppd/ctrl/l2tp/l2tp.h +++ b/accel-pppd/ctrl/l2tp/l2tp.h @@ -64,6 +64,7 @@ struct l2tp_attr_t struct l2tp_packet_t { struct list_head entry; + struct list_head sess_entry; struct sockaddr_in addr; struct l2tp_hdr_t hdr; struct list_head attrs; |