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Corrected bugs in the TCP logic. There might be a few more which need to be taken care of.

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This commit is contained in:
Nikhil Chandru Rao 2006-08-08 22:25:20 +00:00
parent 72cd29f13c
commit 8bf38fb400
1 changed files with 27 additions and 25 deletions
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52
src/net/tcp.c
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@ -326,8 +326,6 @@ void tcp_trans ( struct tcp_connection *conn, int nxt_state ) {
conn->tcp_lstate = conn->tcp_state;
conn->tcp_state = nxt_state;
printf ( "Transition from %s to %s\n", tcp_states[conn->tcp_lstate], tcp_states[conn->tcp_state] );
/* TODO: Check if this check is required */
if ( conn->tcp_lstate == conn->tcp_state ||
conn->tcp_state == TCP_INVALID ) {
@ -343,20 +341,8 @@ void tcp_trans ( struct tcp_connection *conn, int nxt_state ) {
* @v tcphdr TCP header
*/
void tcp_dump ( struct tcp_header *tcphdr ) {
/*
DBG ( "TCP header at %p+%d\n", tcphdr, sizeof ( *tcphdr ) );
DBG ( "\tSource port = %d, Destination port = %d\n",
ntohs ( tcphdr->src ), ntohs ( tcphdr->dest ) );
DBG ( "\tSequence Number = %ld, Acknowledgement Number = %ld\n",
ntohl ( tcphdr->seq ), ntohl ( tcphdr->ack ) );
DBG ( "\tHeader length (/4) = %hd, Flags [..RAPUSF]= %#x\n",
( ( tcphdr->hlen & TCP_MASK_HLEN ) / 16 ),
( tcphdr->flags & TCP_MASK_FLAGS ) );
DBG ( "\tAdvertised window = %ld, Checksum = %x, Urgent Pointer = %d\n",
ntohs ( tcphdr->win ), tcphdr->csum, ntohs ( tcphdr->urg ) );
*/
DBG ( "TCP %p at %p src:%d dest:%d seq:%lld ack:%lld hlen:%hd flags:%#hx\n",
&tcp_protocol, tcphdr, ntohs ( tcphdr->src ), ntohs ( tcphdr->dest ), ntohl ( tcphdr->seq ),
DBG ( "TCP %p src:%d dest:%d seq:%lld ack:%lld hlen:%hd flags:%#hx\n",
tcphdr, ntohs ( tcphdr->src ), ntohs ( tcphdr->dest ), ntohl ( tcphdr->seq ),
ntohl ( tcphdr->ack ), ( ( tcphdr->hlen & TCP_MASK_HLEN ) / 16 ), ( tcphdr->flags & TCP_MASK_FLAGS ) );
}
@ -437,7 +423,7 @@ void tcp_expired ( struct retry_timer *timer, int over ) {
return;
send_tcp_nomsg:
// free_pkb ( conn->tx_pkb );
free_pkb ( conn->tx_pkb );
conn->tx_pkb = alloc_pkb ( MIN_PKB_LEN );
pkb_reserve ( conn->tx_pkb, MAX_HDR_LEN );
tcp_set_flags ( conn );
@ -657,7 +643,6 @@ int tcp_send ( struct tcp_connection *conn, const void *data, size_t len ) {
tcphdr->csum = tcpip_chksum ( pkb->data, pkb_len ( pkb ) );
/* Dump the TCP header */
tcp_dump ( tcphdr );
/* Start the timer */
if ( ( conn->tcp_state == TCP_ESTABLISHED && conn->tcp_lstate == TCP_SYN_SENT ) ||
@ -685,7 +670,7 @@ static int tcp_rx ( struct pk_buff *pkb,
struct tcp_header *tcphdr;
uint32_t acked, toack;
int hlen;
int add = 0;
int add = 4;
/* Sanity check */
if ( pkb_len ( pkb ) < sizeof ( *tcphdr ) ) {
@ -709,7 +694,8 @@ static int tcp_rx ( struct pk_buff *pkb,
return -EINVAL;
}
}
/* TODO: Verify checksum */
/* Demux TCP connection */
@ -768,13 +754,14 @@ static int tcp_rx ( struct pk_buff *pkb,
*/
conn->snd_una = ntohl ( tcphdr->ack );
conn->tcp_op->connected ( conn );
out_flags |= TCP_ACK;
tcp_senddata ( conn );
return;
} else {
tcp_trans ( conn, TCP_SYN_RCVD );
out_flags |= TCP_SYN;
goto send_tcp_nomsg;
}
/* Send SYN,ACK or ACK packet */
goto send_tcp_nomsg;
}
/* Unexpected packet */
goto unexpected;
@ -792,12 +779,12 @@ static int tcp_rx ( struct pk_buff *pkb,
*/
conn->snd_una = tcphdr->ack - 1;
conn->tcp_op->connected ( conn );
tcp_senddata ( conn );
return 0;
}
/* Unexpected packet */
goto unexpected;
case TCP_ESTABLISHED:
#if 0
if ( tcphdr->flags & TCP_FIN ) {
tcp_trans ( conn, TCP_CLOSE_WAIT );
/* FIN consumes one byte */
@ -806,6 +793,7 @@ static int tcp_rx ( struct pk_buff *pkb,
/* Send an acknowledgement */
goto send_tcp_nomsg;
}
#endif
/* Packet might contain data */
break;
case TCP_FIN_WAIT_1:
@ -874,6 +862,9 @@ static int tcp_rx ( struct pk_buff *pkb,
if ( conn->rcv_nxt == ntohl ( tcphdr->seq ) ) {
conn->rcv_nxt += toack;
conn->tcp_op->newdata ( conn, pkb->data + sizeof ( *tcphdr ) + add, toack );
} else {
printf ( "Unexpected sequence number %ld\n",
ntohl ( tcphdr->seq ) );
}
/* Acknowledge new data */
@ -892,13 +883,24 @@ static int tcp_rx ( struct pk_buff *pkb,
}
/* Advance snd stream */
conn->snd_una += acked;
/* Set the ACK flag */
conn->tcp_flags |= TCP_ACK;
/* Invoke the acked() callback function */
conn->tcp_op->acked ( conn, acked );
/* Invoke the senddata() callback function */
tcp_senddata ( conn );
}
/* If the connection is in ESTABLISHED and it receives a FIN */
if ( conn->tcp_state == ESTABLISHED && ( tcphdr->flags & TCP_FIN ) ) {
tcp_trans ( conn, TCP_CLOSE_WAIT );
conn->tcp_op->closed ( conn, CONN_SNDCLOSE );
conn->rcv_nxt++;
if ( ! ( tcphdr->flags & TCP_ACK ) ) {
out_flags |= TCP_ACK;
/* Send an acknowledgement */
goto send_tcp_nomsg;
}
/* Otherwise, the packet has been ACKed already */
}
return 0;
send_tcp_nomsg: