void
pdu_send(struct pdu *pdu)
{
struct connection *conn;
ssize_t ret, total_len;
size_t padding;
uint32_t zero = 0;
struct iovec iov[3];
int iovcnt;
conn = pdu->pdu_connection;
#ifdef ICL_KERNEL_PROXY
if (conn->conn_conf.isc_iser != 0)
return (pdu_send_proxy(pdu));
#endif
assert(conn->conn_conf.isc_iser == 0);
pdu_set_data_segment_length(pdu, pdu->pdu_data_len);
iov[0].iov_base = pdu->pdu_bhs;
iov[0].iov_len = sizeof(*pdu->pdu_bhs);
total_len = iov[0].iov_len;
iovcnt = 1;
if (pdu->pdu_data_len > 0) {
iov[1].iov_base = pdu->pdu_data;
iov[1].iov_len = pdu->pdu_data_len;
total_len += iov[1].iov_len;
iovcnt = 2;
padding = pdu_padding(pdu);
if (padding > 0) {
assert(padding < sizeof(zero));
iov[2].iov_base = &zero;
iov[2].iov_len = padding;
total_len += iov[2].iov_len;
iovcnt = 3;
}
}
ret = writev(conn->conn_socket, iov, iovcnt);
if (ret < 0) {
if (timed_out())
log_errx(1, "exiting due to timeout");
log_err(1, "writev");
}
if (ret != total_len)
log_errx(1, "short write");
}
void
pdu_receive(struct pdu *pdu)
{
size_t len, padding;
char dummy[4];
#ifdef ICL_KERNEL_PROXY
if (pdu->pdu_connection->conn_conf.isc_iser != 0)
return (pdu_receive_proxy(pdu));
#endif
assert(pdu->pdu_connection->conn_conf.isc_iser == 0);
pdu_read(pdu->pdu_connection->conn_socket,
(char *)pdu->pdu_bhs, sizeof(*pdu->pdu_bhs));
len = pdu_ahs_length(pdu);
if (len > 0)
log_errx(1, "protocol error: non-empty AHS");
len = pdu_data_segment_length(pdu);
if (len > 0) {
if (len > ISCSI_MAX_DATA_SEGMENT_LENGTH) {
log_errx(1, "protocol error: received PDU "
"with DataSegmentLength exceeding %d",
ISCSI_MAX_DATA_SEGMENT_LENGTH);
}
pdu->pdu_data_len = len;
pdu->pdu_data = malloc(len);
if (pdu->pdu_data == NULL)
log_err(1, "malloc");
pdu_read(pdu->pdu_connection->conn_socket,
(char *)pdu->pdu_data, pdu->pdu_data_len);
padding = pdu_padding(pdu);
if (padding != 0) {
assert(padding < sizeof(dummy));
pdu_read(pdu->pdu_connection->conn_socket,
(char *)dummy, padding);
}
}
}