/*----------------------------------------------------------------------------*/
static inline int
ProcessRST(mtcp_manager_t mtcp, tcp_stream *cur_stream, uint32_t ack_seq)
{
/* TODO: we need reset validation logic */
/* the sequence number of a RST should be inside window */
/* (in SYN_SENT state, it should ack the previous SYN */
TRACE_DBG("Stream %d: TCP RESET (%s)\n",
cur_stream->id, TCPStateToString(cur_stream));
#if DUMP_STREAM
DumpStream(mtcp, cur_stream);
#endif
if (cur_stream->state <= TCP_ST_SYN_SENT) {
/* not handled here */
return FALSE;
}
if (cur_stream->state == TCP_ST_SYN_RCVD) {
if (ack_seq == cur_stream->rcv_nxt) {
cur_stream->state = TCP_ST_CLOSED;
cur_stream->close_reason = TCP_RESET;
DestroyTCPStream(mtcp, cur_stream);
}
return TRUE;
}
/* if the application is already closed the connection,
just destroy the it */
if (cur_stream->state == TCP_ST_FIN_WAIT_1 ||
cur_stream->state == TCP_ST_FIN_WAIT_2 ||
cur_stream->state == TCP_ST_LAST_ACK ||
cur_stream->state == TCP_ST_CLOSING ||
cur_stream->state == TCP_ST_TIME_WAIT) {
cur_stream->state = TCP_ST_CLOSED;
cur_stream->close_reason = TCP_ACTIVE_CLOSE;
DestroyTCPStream(mtcp, cur_stream);
return TRUE;
}
if (cur_stream->state >= TCP_ST_ESTABLISHED &&
cur_stream->state <= TCP_ST_CLOSE_WAIT) {
/* ESTABLISHED, FIN_WAIT_1, FIN_WAIT_2, CLOSE_WAIT */
/* TODO: flush all the segment queues */
//NotifyConnectionReset(mtcp, cur_stream);
}
if (!(cur_stream->sndvar->on_closeq || cur_stream->sndvar->on_closeq_int ||
cur_stream->sndvar->on_resetq || cur_stream->sndvar->on_resetq_int)) {
//cur_stream->state = TCP_ST_CLOSED;
//DestroyTCPStream(mtcp, cur_stream);
cur_stream->state = TCP_ST_CLOSE_WAIT;
cur_stream->close_reason = TCP_RESET;
RaiseCloseEvent(mtcp, cur_stream);
}
return TRUE;
}
/*----------------------------------------------------------------------------*/
static inline int
ProcessRST(mtcp_manager_t mtcp, tcp_stream *cur_stream,
struct pkt_ctx *pctx)
{
/* TODO: we need reset validation logic */
/* the sequence number of a RST should be inside window */
/* (in SYN_SENT state, it should ack the previous SYN */
TRACE_DBG("Stream %d: TCP RESET (%s)\n",
cur_stream->id, TCPStateToString(cur_stream));
#if DUMP_STREAM
DumpStream(mtcp, cur_stream);
#endif
if (cur_stream->state <= TCP_ST_SYN_SENT) {
/* not handled here */
return FALSE;
}
if (cur_stream->state == TCP_ST_SYN_RCVD) {
/* ACK number of last sent ACK packet == rcv_nxt + 1*/
if (pctx->p.seq == 0 ||
#ifdef BE_RESILIENT_TO_PACKET_DROP
pctx->p.seq == cur_stream->rcv_nxt + 1 ||
#endif
pctx->p.ack_seq == cur_stream->rcv_nxt + 1)
{
cur_stream->state = TCP_ST_CLOSED_RSVD;
cur_stream->cb_events |= MOS_ON_TCP_STATE_CHANGE;
cur_stream->close_reason = TCP_RESET;
cur_stream->actions |= MOS_ACT_DESTROY;
} else {
RAISE_DEBUG_EVENT(mtcp, cur_stream,
"(SYN_RCVD): Ignore invalid RST. "
"ack_seq expected: %u, ack_seq rcvd: %u\n",
cur_stream->rcv_nxt + 1, pctx->p.ack_seq);
}
return TRUE;
}
/* if the application is already closed the connection,
just destroy the it */
if (cur_stream->state == TCP_ST_FIN_WAIT_1 ||
cur_stream->state == TCP_ST_FIN_WAIT_2 ||
cur_stream->state == TCP_ST_LAST_ACK ||
cur_stream->state == TCP_ST_CLOSING ||
cur_stream->state == TCP_ST_TIME_WAIT) {
cur_stream->state = TCP_ST_CLOSED_RSVD;
cur_stream->close_reason = TCP_ACTIVE_CLOSE;
cur_stream->cb_events |= MOS_ON_TCP_STATE_CHANGE;
cur_stream->actions |= MOS_ACT_DESTROY;
return TRUE;
}
if (cur_stream->state >= TCP_ST_ESTABLISHED &&
cur_stream->state <= TCP_ST_CLOSE_WAIT) {
/* ESTABLISHED, FIN_WAIT_1, FIN_WAIT_2, CLOSE_WAIT */
/* TODO: flush all the segment queues */
//NotifyConnectionReset(mtcp, cur_stream);
}
if (!(cur_stream->sndvar->on_closeq || cur_stream->sndvar->on_closeq_int ||
cur_stream->sndvar->on_resetq || cur_stream->sndvar->on_resetq_int)) {
//cur_stream->state = TCP_ST_CLOSED_RSVD;
//cur_stream->actions |= MOS_ACT_DESTROY;
cur_stream->state = TCP_ST_CLOSED_RSVD;
cur_stream->cb_events |= MOS_ON_TCP_STATE_CHANGE;
cur_stream->close_reason = TCP_RESET;
if (HAS_STREAM_TYPE(cur_stream, MOS_SOCK_STREAM))
RaiseCloseEvent(mtcp, cur_stream);
}
return TRUE;
}