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Reserve space for lower-layer headers when allocating packet buffer.

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Use pkb_available() rather than pkb_len() (which will always return 0
on a freshly allocated buffer).

udp_send() should assume that the buffer has already been allocated.
This commit is contained in:
Michael Brown 2006-07-19 18:21:30 +00:00
parent 6858b14a34
commit ab633f6a73
1 changed files with 5 additions and 33 deletions
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38
src/net/udp.c
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@ -87,24 +87,6 @@ void udp_init ( struct udp_connection *conn, struct udp_operations *udp_op ) {
}
}
/**
* Allocate space to the UDP buffer
*
* @v conn UDP connection
* @v len Length to allocate
* @ret rc Status
*
* Allocate "len" amount of space in the transmit buffer
*/
int udp_buf_alloc ( struct udp_connection *conn, size_t len ) {
if ( conn->tx_pkb != NULL ) {
free_pkb ( conn->tx_pkb );
conn->tx_pkb = NULL;
}
conn->tx_pkb = alloc_pkb ( len < UDP_MIN_TXPKB ? UDP_MIN_TXPKB : len );
return !conn ? -ENOMEM : 0;
}
/**
* User request to send data via a UDP connection
*
@ -120,11 +102,12 @@ int udp_senddata ( struct udp_connection *conn ) {
UDP_MAX_TXPKB );
return -ENOMEM;
}
conn->udp_op->senddata ( conn, conn->tx_pkb, pkb_len ( conn->tx_pkb ) );
pkb_reserve ( conn->tx_pkb, UDP_MAX_HLEN );
conn->udp_op->senddata ( conn, conn->tx_pkb,
pkb_available ( conn->tx_pkb ) );
return 0;
}
/**
* Transmit data via a UDP connection
*
@ -140,20 +123,9 @@ int udp_send ( struct udp_connection *conn, const void *data, size_t len ) {
struct udp_header *udphdr; /* UDP header */
struct sockaddr *sock = &conn->sin; /* Destination sockaddr */
uint16_t *dest;
int rc;
/* Copy data into packet buffer, if necessary */
if ( data != conn->tx_pkb->data ) {
/* Allocate space for data and lower layer headers */
if ( ( rc = udp_buf_alloc ( conn, len + UDP_MAX_HLEN ) ) != 0 ) {
DBG ( "Error allocating buffer" );
return rc;
}
/* Reserve space for the headers and copy contents */
pkb_reserve ( conn->tx_pkb, UDP_MAX_HLEN );
memmove ( pkb_put ( conn->tx_pkb, len ), data, len );
}
/* Copy payload */
memmove ( pkb_put ( conn->tx_pkb, len ), data, len );
/*
* Add the UDP header