--- /dev/null
+/*
+ * Copyright (c) 2004, Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file is part of the Contiki operating system.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ * $Id: uip-split.c,v 1.2 2008/10/14 13:39:12 julienabeille Exp $
+ */
+
+#include "uip-split.h"
+
+
+#define BUF ((struct uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN])
+
+/*-----------------------------------------------------------------------------*/
+void
+uip_split_output(void)
+{
+#if UIP_TCP
+ u16_t tcplen, len1, len2;
+
+ /* We only try to split maximum sized TCP segments. */
+ if(BUF->proto == UIP_PROTO_TCP && uip_len == UIP_BUFSIZE) {
+
+ tcplen = uip_len - UIP_TCPIP_HLEN - UIP_LLH_LEN;
+ /* Split the segment in two. If the original packet length was
+ odd, we make the second packet one byte larger. */
+ len1 = len2 = tcplen / 2;
+ if(len1 + len2 < tcplen) {
+ ++len2;
+ }
+
+ /* Create the first packet. This is done by altering the length
+ field of the IP header and updating the checksums. */
+ uip_len = len1 + UIP_TCPIP_HLEN + UIP_LLH_LEN;
+#if UIP_CONF_IPV6
+ /* For IPv6, the IP length field does not include the IPv6 IP header
+ length. */
+ BUF->len[0] = ((uip_len - UIP_IPH_LEN) >> 8);
+ BUF->len[1] = ((uip_len - UIP_IPH_LEN) & 0xff);
+#else /* UIP_CONF_IPV6 */
+ BUF->len[0] = (uip_len - UIP_LLH_LEN) >> 8;
+ BUF->len[1] = (uip_len - UIP_LLH_LEN) & 0xff;
+#endif /* UIP_CONF_IPV6 */
+
+ /* Recalculate the TCP checksum. */
+ BUF->tcpchksum = 0;
+ BUF->tcpchksum = ~(uip_tcpchksum());
+
+#if !UIP_CONF_IPV6
+ /* Recalculate the IP checksum. */
+ BUF->ipchksum = 0;
+ BUF->ipchksum = ~(uip_ipchksum());
+#endif /* UIP_CONF_IPV6 */
+
+ /* Transmit the first packet. */
+#if UIP_CONF_IPV6
+ tcpip_ipv6_output();
+#else
+ if (USB_CurrentMode == USB_MODE_Device)
+ RNDIS_Device_SendPacket(&Ethernet_RNDIS_Interface_Device, uip_buf, uip_len);
+ else
+ RNDIS_Host_SendPacket(&Ethernet_RNDIS_Interface_Host, uip_buf, uip_len);
+#endif /* UIP_CONF_IPV6 */
+
+ /* Now, create the second packet. To do this, it is not enough to
+ just alter the length field, but we must also update the TCP
+ sequence number and point the uip_appdata to a new place in
+ memory. This place is determined by the length of the first
+ packet (len1). */
+ uip_len = len2 + UIP_TCPIP_HLEN + UIP_LLH_LEN;
+#if UIP_CONF_IPV6
+ /* For IPv6, the IP length field does not include the IPv6 IP header
+ length. */
+ BUF->len[0] = ((uip_len - UIP_IPH_LEN) >> 8);
+ BUF->len[1] = ((uip_len - UIP_IPH_LEN) & 0xff);
+#else /* UIP_CONF_IPV6 */
+ BUF->len[0] = (uip_len - UIP_LLH_LEN) >> 8;
+ BUF->len[1] = (uip_len - UIP_LLH_LEN) & 0xff;
+#endif /* UIP_CONF_IPV6 */
+
+ memcpy(uip_appdata, (u8_t *)uip_appdata + len1, len2);
+
+ uip_add32(BUF->seqno, len1);
+ BUF->seqno[0] = uip_acc32[0];
+ BUF->seqno[1] = uip_acc32[1];
+ BUF->seqno[2] = uip_acc32[2];
+ BUF->seqno[3] = uip_acc32[3];
+
+ /* Recalculate the TCP checksum. */
+ BUF->tcpchksum = 0;
+ BUF->tcpchksum = ~(uip_tcpchksum());
+
+#if !UIP_CONF_IPV6
+ /* Recalculate the IP checksum. */
+ BUF->ipchksum = 0;
+ BUF->ipchksum = ~(uip_ipchksum());
+#endif /* UIP_CONF_IPV6 */
+
+ /* Transmit the second packet. */
+#if UIP_CONF_IPV6
+ tcpip_ipv6_output();
+#else
+ if (USB_CurrentMode == USB_MODE_Device)
+ RNDIS_Device_SendPacket(&Ethernet_RNDIS_Interface_Device, uip_buf, uip_len);
+ else
+ RNDIS_Host_SendPacket(&Ethernet_RNDIS_Interface_Host, uip_buf, uip_len);
+#endif /* UIP_CONF_IPV6 */
+ return;
+ }
+#endif /* UIP_TCP */
+
+ /* uip_fw_output();*/
+#if UIP_CONF_IPV6
+ tcpip_ipv6_output();
+#else
+ if (USB_CurrentMode == USB_MODE_Device)
+ RNDIS_Device_SendPacket(&Ethernet_RNDIS_Interface_Device, uip_buf, uip_len);
+ else
+ RNDIS_Host_SendPacket(&Ethernet_RNDIS_Interface_Host, uip_buf, uip_len);
+#endif /* UIP_CONF_IPV6 */
+}
+
+/*-----------------------------------------------------------------------------*/
+
projects / qmk_firmware.git / blobdiff