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Avoid calling NULL methods!

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This commit is contained in:
Michael Brown 2006-12-05 21:09:37 +00:00
parent 89bcb57201
commit 3fbfbad0f7
1 changed files with 22 additions and 12 deletions
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34
src/net/tcp.c
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@ -497,7 +497,8 @@ int tcp_close ( struct tcp_connection *conn ) {
case TCP_SYN_RCVD:
case TCP_ESTABLISHED:
tcp_trans ( conn, TCP_FIN_WAIT_1 );
conn->tcp_op->closed ( conn, CONN_SNDCLOSE ); /* TODO: Check! */
if ( conn->tcp_op->closed )
conn->tcp_op->closed ( conn, CONN_SNDCLOSE ); /* TODO: Check! */
/* FIN consumes one byte on the snd stream */
// conn->snd_una++;
goto send_tcp_nomsg;
@ -510,11 +511,13 @@ int tcp_close ( struct tcp_connection *conn ) {
*/
list_del ( &conn->list );
tcp_trans ( conn, TCP_CLOSED );
conn->tcp_op->closed ( conn, CONN_SNDCLOSE );
if ( conn->tcp_op->closed )
conn->tcp_op->closed ( conn, CONN_SNDCLOSE );
return 0;
case TCP_CLOSE_WAIT:
tcp_trans ( conn, TCP_LAST_ACK );
conn->tcp_op->closed ( conn, CONN_SNDCLOSE ); /* TODO: Check! */
if ( conn->tcp_op->closed )
conn->tcp_op->closed ( conn, CONN_SNDCLOSE ); /* TODO: Check! */
/* FIN consumes one byte on the snd stream */
// conn->snd_una++;
goto send_tcp_nomsg;
@ -630,8 +633,9 @@ int tcp_senddata ( struct tcp_connection *conn ) {
/* Set the advertised window */
conn->rcv_win = pkb_available ( conn->tx_pkb );
/* Call the senddata() call back function */
conn->tcp_op->senddata ( conn, conn->tx_pkb->data,
pkb_available ( conn->tx_pkb ) );
if ( conn->tcp_op->senddata )
conn->tcp_op->senddata ( conn, conn->tx_pkb->data,
pkb_available ( conn->tx_pkb ) );
/* Send pure ACK if senddata() didn't call tcp_send() */
if ( conn->tx_pkb ) {
tcp_send ( conn, TCP_NOMSG, TCP_NOMSG_LEN );
@ -796,7 +800,8 @@ static int tcp_rx ( struct pk_buff *pkb,
* acked() callback function.
*/
conn->snd_una = ntohl ( tcphdr->ack );
conn->tcp_op->connected ( conn );
if ( conn->tcp_op->connected )
conn->tcp_op->connected ( conn );
conn->tcp_flags |= TCP_ACK;
tcp_senddata ( conn );
rc = 0;
@ -812,7 +817,8 @@ static int tcp_rx ( struct pk_buff *pkb,
case TCP_SYN_RCVD:
if ( tcphdr->flags & TCP_RST ) {
tcp_trans ( conn, TCP_LISTEN );
conn->tcp_op->closed ( conn, CONN_RESTART );
if ( conn->tcp_op->closed )
conn->tcp_op->closed ( conn, CONN_RESTART );
rc = 0;
goto done;
}
@ -823,7 +829,8 @@ static int tcp_rx ( struct pk_buff *pkb,
* function nor does it send an ACK.
*/
conn->snd_una = tcphdr->ack - 1;
conn->tcp_op->connected ( conn );
if ( conn->tcp_op->connected )
conn->tcp_op->connected ( conn );
rc = 0;
goto done;
}
@ -849,7 +856,8 @@ static int tcp_rx ( struct pk_buff *pkb,
if ( tcphdr->flags & TCP_FIN ) {
conn->rcv_nxt++;
conn->tcp_flags |= TCP_ACK;
conn->tcp_op->closed ( conn, CONN_SNDCLOSE );
if ( conn->tcp_op->closed )
conn->tcp_op->closed ( conn, CONN_SNDCLOSE );
if ( tcphdr->flags & TCP_ACK ) {
tcp_trans ( conn, TCP_TIME_WAIT );
@ -920,7 +928,8 @@ static int tcp_rx ( struct pk_buff *pkb,
}
/* Invoke the acked() callback */
conn->snd_una += acked;
conn->tcp_op->acked ( conn, acked );
if ( conn->tcp_op->acked )
conn->tcp_op->acked ( conn, acked );
}
/**
@ -931,8 +940,9 @@ static int tcp_rx ( struct pk_buff *pkb,
/* Check the sequence number */
if ( conn->rcv_nxt == ntohl ( tcphdr->seq ) ) {
conn->rcv_nxt += toack;
conn->tcp_op->newdata ( conn,
pkb->data + hlen, toack );
if ( conn->tcp_op->newdata )
conn->tcp_op->newdata ( conn, pkb->data + hlen,
toack );
} else {
DBG ( "Unexpected sequence number %lx (wanted %lx)\n",
ntohl ( tcphdr->ack ), conn->rcv_nxt );