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Truncate TX length to TCP window at time of transmission rather than at
time of adding to TX packet; this is conceptually cleaner and also allows
the application to call tcp_send() multiple times to build up a single
packet.
This commit is contained in:
Michael Brown 2006-12-29 14:03:03 +00:00
parent 2494625702
commit feb4f65d1e
1 changed files with 44 additions and 45 deletions
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89
src/net/tcp.c
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@ -112,9 +112,9 @@ static inline __attribute__ (( always_inline )) void
tcp_dump_state ( struct tcp_connection *conn ) {
if ( conn->tcp_state != conn->prev_tcp_state ) {
DBG ( "TCP %p transitioned from %s to %s\n", conn,
tcp_state ( conn->prev_tcp_state ),
tcp_state ( conn->tcp_state ) );
DBGC ( conn, "TCP %p transitioned from %s to %s\n", conn,
tcp_state ( conn->prev_tcp_state ),
tcp_state ( conn->tcp_state ) );
}
conn->prev_tcp_state = conn->tcp_state;
}
@ -125,17 +125,17 @@ tcp_dump_state ( struct tcp_connection *conn ) {
* @v flags TCP flags
*/
static inline __attribute__ (( always_inline )) void
tcp_dump_flags ( unsigned int flags ) {
tcp_dump_flags ( struct tcp_connection *conn, unsigned int flags ) {
if ( flags & TCP_RST )
DBG ( " RST" );
DBGC ( conn, " RST" );
if ( flags & TCP_SYN )
DBG ( " SYN" );
DBGC ( conn, " SYN" );
if ( flags & TCP_PSH )
DBG ( " PSH" );
DBGC ( conn, " PSH" );
if ( flags & TCP_FIN )
DBG ( " FIN" );
DBGC ( conn, " FIN" );
if ( flags & TCP_ACK )
DBG ( " ACK" );
DBGC ( conn, " ACK" );
}
/**
@ -150,7 +150,7 @@ static struct tcp_connection * alloc_tcp ( void ) {
conn = calloc ( 1, sizeof ( *conn ) );
if ( conn ) {
DBG ( "TCP %p allocated\n", conn );
DBGC ( conn, "TCP %p allocated\n", conn );
conn->tcp_state = conn->prev_tcp_state = TCP_CLOSED;
conn->snd_seq = random();
conn->timer.expired = tcp_expired;
@ -176,7 +176,7 @@ static void free_tcp ( struct tcp_connection *conn ) {
stop_timer ( &conn->timer );
list_del ( &conn->list );
free ( conn );
DBG ( "TCP %p freed\n", conn );
DBGC ( conn, "TCP %p freed\n", conn );
}
/**
@ -191,7 +191,7 @@ static void tcp_associate ( struct tcp_connection *conn,
assert ( app->conn == NULL );
conn->app = app;
app->conn = conn;
DBG ( "TCP %p associated with application %p\n", conn, app );
DBGC ( conn, "TCP %p associated with application %p\n", conn, app );
}
/**
@ -206,8 +206,8 @@ static void tcp_disassociate ( struct tcp_connection *conn ) {
assert ( app->conn == conn );
conn->app = NULL;
app->conn = NULL;
DBG ( "TCP %p disassociated from application %p\n",
conn, app );
DBGC ( conn, "TCP %p disassociated from application %p\n",
conn, app );
}
}
@ -236,11 +236,11 @@ static int tcp_senddata_conn ( struct tcp_connection *conn, int force_send ) {
/* Allocate space to the TX buffer */
pkb = alloc_pkb ( MAX_PKB_LEN );
if ( ! pkb ) {
DBG ( "TCP %p could not allocate senddata buffer\n", conn );
DBGC ( conn, "TCP %p could not allocate data buffer\n", conn );
/* Start the retry timer so that we attempt to
* retransmit this packet later. (Start it
* unconditionally, since without a packet buffer we
* can't can the senddata() callback, and so may not
* can't call the senddata() callback, and so may not
* be able to tell whether or not we have something
* that actually needs to be retransmitted).
*/
@ -259,11 +259,15 @@ static int tcp_senddata_conn ( struct tcp_connection *conn, int force_send ) {
conn->tx_pkb = NULL;
}
/* Truncate payload length to fit transmit window */
len = pkb_len ( pkb );
if ( len > conn->snd_win )
len = conn->snd_win;
/* Calculate amount of sequence space that this transmission
* consumes. (SYN or FIN consume one byte, and we can never
* send both at once).
*/
len = pkb_len ( pkb );
seq_len = len;
flags = TCP_FLAGS_SENDING ( conn->tcp_state );
assert ( ! ( ( flags & TCP_SYN ) && ( flags & TCP_FIN ) ) );
@ -297,12 +301,12 @@ static int tcp_senddata_conn ( struct tcp_connection *conn, int force_send ) {
tcphdr->csum = tcpip_chksum ( pkb->data, pkb_len ( pkb ) );
/* Dump header */
DBG ( "TCP %p TX %d->%d %08lx..%08lx %08lx %4zd", conn,
ntohs ( tcphdr->src ), ntohs ( tcphdr->dest ),
ntohl ( tcphdr->seq ), ( ntohl ( tcphdr->seq ) + seq_len ),
ntohl ( tcphdr->ack ), len );
tcp_dump_flags ( tcphdr->flags );
DBG ( "\n" );
DBGC ( conn, "TCP %p TX %d->%d %08lx..%08lx %08lx %4zd",
conn, ntohs ( tcphdr->src ), ntohs ( tcphdr->dest ),
ntohl ( tcphdr->seq ), ( ntohl ( tcphdr->seq ) + seq_len ),
ntohl ( tcphdr->ack ), len );
tcp_dump_flags ( conn, tcphdr->flags );
DBGC ( conn, "\n" );
/* Transmit packet */
return tcpip_tx ( pkb, &tcp_protocol, &conn->peer );
@ -359,10 +363,6 @@ int tcp_send ( struct tcp_application *app, const void *data, size_t len ) {
return -EINVAL;
}
/* Truncate length to fit transmit window */
if ( len > conn->snd_win )
len = conn->snd_win;
/* Truncate length to fit packet buffer */
if ( len > pkb_available ( pkb ) )
len = pkb_available ( pkb );
@ -385,8 +385,8 @@ static void tcp_expired ( struct retry_timer *timer, int over ) {
struct tcp_application *app = conn->app;
int graceful_close = TCP_CLOSED_GRACEFULLY ( conn->tcp_state );
DBG ( "TCP %p timer %s in %s\n", conn,
( over ? "expired" : "fired" ), tcp_state ( conn->tcp_state ) );
DBGC ( conn, "TCP %p timer %s in %s\n", conn,
( over ? "expired" : "fired" ), tcp_state ( conn->tcp_state ) );
assert ( ( conn->tcp_state == TCP_SYN_SENT ) ||
( conn->tcp_state == TCP_SYN_RCVD ) ||
@ -485,10 +485,10 @@ static int tcp_rx_ack ( struct tcp_connection *conn, uint32_t ack,
/* Ignore duplicate or out-of-range ACK */
if ( ack_len > conn->snd_sent ) {
DBG ( "TCP %p received ACK for [%08lx,%08lx), sent only "
"[%08lx,%08lx)\n", conn, conn->snd_seq,
( conn->snd_seq + ack_len ), conn->snd_seq,
( conn->snd_seq + conn->snd_sent ) );
DBGC ( conn, "TCP %p received ACK for [%08lx,%08lx), "
"sent only [%08lx,%08lx)\n", conn, conn->snd_seq,
( conn->snd_seq + ack_len ), conn->snd_seq,
( conn->snd_seq + conn->snd_sent ) );
return -EINVAL;
}
@ -643,13 +643,13 @@ static int tcp_rx ( struct pk_buff *pkb,
len = pkb_len ( pkb );
/* Dump header */
DBG ( "TCP %p RX %d<-%d %08lx %08lx..%08lx %4zd", conn,
ntohs ( tcphdr->dest ), ntohs ( tcphdr->src ),
ntohl ( tcphdr->ack ), ntohl ( tcphdr->seq ),
( ntohl ( tcphdr->seq ) + len +
( ( tcphdr->flags & ( TCP_SYN | TCP_FIN ) ) ? 1 : 0 ) ), len );
tcp_dump_flags ( tcphdr->flags );
DBG ( "\n" );
DBGC ( conn, "TCP %p RX %d<-%d %08lx %08lx..%08lx %4zd",
conn, ntohs ( tcphdr->dest ), ntohs ( tcphdr->src ),
ntohl ( tcphdr->ack ), ntohl ( tcphdr->seq ),
( ntohl ( tcphdr->seq ) + len +
( ( tcphdr->flags & ( TCP_SYN | TCP_FIN ) ) ? 1 : 0 ) ), len);
tcp_dump_flags ( conn, tcphdr->flags );
DBGC ( conn, "\n" );
/* If no connection was found, create dummy connection for
* sending RST
@ -731,22 +731,21 @@ static int tcp_bind ( struct tcp_connection *conn, uint16_t local_port ) {
if ( tcp_bind ( conn, htons ( try_port ) ) == 0 )
return 0;
}
DBG ( "TCP %p could not bind: no free ports remaining\n",
conn );
DBGC ( conn, "TCP %p could not bind: no free ports\n", conn );
return -EADDRINUSE;
}
/* Attempt bind to local port */
list_for_each_entry ( existing, &tcp_conns, list ) {
if ( existing->local_port == local_port ) {
DBG ( "TCP %p could not bind: port %d in use\n",
conn, ntohs ( local_port ) );
DBGC ( conn, "TCP %p could not bind: port %d in use\n",
conn, ntohs ( local_port ) );
return -EADDRINUSE;
}
}
conn->local_port = local_port;
DBG ( "TCP %p bound to port %d\n", conn, ntohs ( local_port ) );
DBGC ( conn, "TCP %p bound to port %d\n", conn, ntohs ( local_port ) );
return 0;
}