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Accept RST on received packets

This commit is contained in:
Michael Brown 2007-01-03 21:51:36 +00:00
parent 94fc68895d
commit eea1167a85
1 changed files with 49 additions and 9 deletions
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58
src/net/tcp.c
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@ -559,7 +559,8 @@ static int tcp_rx_data ( struct tcp_connection *conn, uint32_t seq,
return 0;
}
/** Handle TCP received FIN
/**
* Handle TCP received FIN
*
* @v conn TCP connection
* @v seq SEQ value (in host-endian order)
@ -587,6 +588,46 @@ static int tcp_rx_fin ( struct tcp_connection *conn, uint32_t seq ) {
return 0;
}
/**
* Handle TCP received RST
*
* @v conn TCP connection
* @v seq SEQ value (in host-endian order)
* @ret rc Return status code
*/
static int tcp_rx_rst ( struct tcp_connection *conn, uint32_t seq ) {
struct tcp_application *app = conn->app;
/* Accept RST only if it falls within the window. If we have
* not yet received a SYN, then we have no window to test
* against, so fall back to checking that our SYN has been
* ACKed.
*/
if ( conn->tcp_state & TCP_STATE_RCVD ( TCP_SYN ) ) {
if ( ( conn->rcv_ack - seq ) > 0 )
return 0;
} else {
if ( ! ( conn->tcp_state & TCP_STATE_ACKED ( TCP_SYN ) ) )
return 0;
}
/* Transition to CLOSED */
conn->tcp_state = TCP_CLOSED;
tcp_dump_state ( conn );
/* Break association between application and connection */
tcp_disassociate ( conn );
/* Free the connection */
free_tcp ( conn );
/* Notify application */
if ( app && app->tcp_op->closed )
app->tcp_op->closed ( app, -ECONNRESET );
return -ECONNRESET;
}
/**
* Process received packet
*
@ -668,13 +709,6 @@ static int tcp_rx ( struct pk_buff *pkb,
goto done;
}
/* Handle RST, if present */
#warning "Handle RST"
if ( flags & TCP_RST ) {
rc = -ECONNRESET;
goto done;
}
/* Handle ACK, if present */
if ( flags & TCP_ACK )
tcp_rx_ack ( conn, ack, win );
@ -685,6 +719,12 @@ static int tcp_rx ( struct pk_buff *pkb,
seq++;
}
/* Handle RST, if present */
if ( flags & TCP_RST ) {
if ( ( rc = tcp_rx_rst ( conn, seq ) ) != 0 )
goto done;
}
/* Handle new data, if any */
tcp_rx_data ( conn, seq, data, len );
seq += len;
@ -695,7 +735,7 @@ static int tcp_rx ( struct pk_buff *pkb,
seq++;
}
/* Dump out any state change as a result of SYN, FIN or ACK */
/* Dump out any state change as a result of the received packet */
tcp_dump_state ( conn );
/* Send out any pending data. If peer is expecting an ACK for