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EMAC/uIP/uip/uip-split.c@0:bf7b9fba3924, 2011-03-20 (annotated)

Committer:: frank26080115
Date:: Sun Mar 20 05:38:56 2011 +0000
Revision:: 0:bf7b9fba3924

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User	Revision	Line number	New contents of line
frank26080115	0:bf7b9fba3924	1	/*
frank26080115	0:bf7b9fba3924	2	* Copyright (c) 2004, Swedish Institute of Computer Science.
frank26080115	0:bf7b9fba3924	3	* All rights reserved.
frank26080115	0:bf7b9fba3924	4	*
frank26080115	0:bf7b9fba3924	5	* Redistribution and use in source and binary forms, with or without
frank26080115	0:bf7b9fba3924	6	* modification, are permitted provided that the following conditions
frank26080115	0:bf7b9fba3924	7	* are met:
frank26080115	0:bf7b9fba3924	8	* 1. Redistributions of source code must retain the above copyright
frank26080115	0:bf7b9fba3924	9	* notice, this list of conditions and the following disclaimer.
frank26080115	0:bf7b9fba3924	10	* 2. Redistributions in binary form must reproduce the above copyright
frank26080115	0:bf7b9fba3924	11	* notice, this list of conditions and the following disclaimer in the
frank26080115	0:bf7b9fba3924	12	* documentation and/or other materials provided with the distribution.
frank26080115	0:bf7b9fba3924	13	* 3. Neither the name of the Institute nor the names of its contributors
frank26080115	0:bf7b9fba3924	14	* may be used to endorse or promote products derived from this software
frank26080115	0:bf7b9fba3924	15	* without specific prior written permission.
frank26080115	0:bf7b9fba3924	16	*
frank26080115	0:bf7b9fba3924	17	* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
frank26080115	0:bf7b9fba3924	18	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
frank26080115	0:bf7b9fba3924	19	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
frank26080115	0:bf7b9fba3924	20	* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
frank26080115	0:bf7b9fba3924	21	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
frank26080115	0:bf7b9fba3924	22	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
frank26080115	0:bf7b9fba3924	23	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
frank26080115	0:bf7b9fba3924	24	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
frank26080115	0:bf7b9fba3924	25	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
frank26080115	0:bf7b9fba3924	26	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
frank26080115	0:bf7b9fba3924	27	* SUCH DAMAGE.
frank26080115	0:bf7b9fba3924	28	*
frank26080115	0:bf7b9fba3924	29	* This file is part of the uIP TCP/IP stack
frank26080115	0:bf7b9fba3924	30	*
frank26080115	0:bf7b9fba3924	31	* Author: Adam Dunkels <adam@sics.se>
frank26080115	0:bf7b9fba3924	32	*
frank26080115	0:bf7b9fba3924	33	* $Id: uip-split.c,v 1.2 2006/06/12 08:00:30 adam Exp $
frank26080115	0:bf7b9fba3924	34	*/
frank26080115	0:bf7b9fba3924	35
frank26080115	0:bf7b9fba3924	36	#include <string.h>
frank26080115	0:bf7b9fba3924	37
frank26080115	0:bf7b9fba3924	38	#include "uip-split.h"
frank26080115	0:bf7b9fba3924	39	#include "uip.h"
frank26080115	0:bf7b9fba3924	40	#include "uip-fw.h"
frank26080115	0:bf7b9fba3924	41	#include "uip_arch.h"
frank26080115	0:bf7b9fba3924	42
frank26080115	0:bf7b9fba3924	43
frank26080115	0:bf7b9fba3924	44
frank26080115	0:bf7b9fba3924	45	#define BUF ((struct uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN])
frank26080115	0:bf7b9fba3924	46
frank26080115	0:bf7b9fba3924	47	/-----------------------------------------------------------------------------/
frank26080115	0:bf7b9fba3924	48	void
frank26080115	0:bf7b9fba3924	49	uip_split_output(void)
frank26080115	0:bf7b9fba3924	50	{
frank26080115	0:bf7b9fba3924	51	u16_t tcplen, len1, len2;
frank26080115	0:bf7b9fba3924	52
frank26080115	0:bf7b9fba3924	53	/* We only try to split maximum sized TCP segments. */
frank26080115	0:bf7b9fba3924	54	if(BUF->proto == UIP_PROTO_TCP &&
frank26080115	0:bf7b9fba3924	55	uip_len == UIP_BUFSIZE - UIP_LLH_LEN) {
frank26080115	0:bf7b9fba3924	56
frank26080115	0:bf7b9fba3924	57	tcplen = uip_len - UIP_TCPIP_HLEN;
frank26080115	0:bf7b9fba3924	58	/* Split the segment in two. If the original packet length was
frank26080115	0:bf7b9fba3924	59	odd, we make the second packet one byte larger. */
frank26080115	0:bf7b9fba3924	60	len1 = len2 = tcplen / 2;
frank26080115	0:bf7b9fba3924	61	if(len1 + len2 < tcplen) {
frank26080115	0:bf7b9fba3924	62	++len2;
frank26080115	0:bf7b9fba3924	63	}
frank26080115	0:bf7b9fba3924	64
frank26080115	0:bf7b9fba3924	65	/* Create the first packet. This is done by altering the length
frank26080115	0:bf7b9fba3924	66	field of the IP header and updating the checksums. */
frank26080115	0:bf7b9fba3924	67	uip_len = len1 + UIP_TCPIP_HLEN;
frank26080115	0:bf7b9fba3924	68	#if UIP_CONF_IPV6
frank26080115	0:bf7b9fba3924	69	/* For IPv6, the IP length field does not include the IPv6 IP header
frank26080115	0:bf7b9fba3924	70	length. */
frank26080115	0:bf7b9fba3924	71	BUF->len[0] = ((uip_len - UIP_IPH_LEN) >> 8);
frank26080115	0:bf7b9fba3924	72	BUF->len[1] = ((uip_len - UIP_IPH_LEN) & 0xff);
frank26080115	0:bf7b9fba3924	73	#else /* UIP_CONF_IPV6 */
frank26080115	0:bf7b9fba3924	74	BUF->len[0] = uip_len >> 8;
frank26080115	0:bf7b9fba3924	75	BUF->len[1] = uip_len & 0xff;
frank26080115	0:bf7b9fba3924	76	#endif /* UIP_CONF_IPV6 */
frank26080115	0:bf7b9fba3924	77
frank26080115	0:bf7b9fba3924	78	/* Recalculate the TCP checksum. */
frank26080115	0:bf7b9fba3924	79	BUF->tcpchksum = 0;
frank26080115	0:bf7b9fba3924	80	BUF->tcpchksum = ~(uip_tcpchksum());
frank26080115	0:bf7b9fba3924	81
frank26080115	0:bf7b9fba3924	82	#if !UIP_CONF_IPV6
frank26080115	0:bf7b9fba3924	83	/* Recalculate the IP checksum. */
frank26080115	0:bf7b9fba3924	84	BUF->ipchksum = 0;
frank26080115	0:bf7b9fba3924	85	BUF->ipchksum = ~(uip_ipchksum());
frank26080115	0:bf7b9fba3924	86	#endif /* UIP_CONF_IPV6 */
frank26080115	0:bf7b9fba3924	87
frank26080115	0:bf7b9fba3924	88	/* Transmit the first packet. */
frank26080115	0:bf7b9fba3924	89	/* uip_fw_output();*/
frank26080115	0:bf7b9fba3924	90	tcpip_output();
frank26080115	0:bf7b9fba3924	91
frank26080115	0:bf7b9fba3924	92	/* Now, create the second packet. To do this, it is not enough to
frank26080115	0:bf7b9fba3924	93	just alter the length field, but we must also update the TCP
frank26080115	0:bf7b9fba3924	94	sequence number and point the uip_appdata to a new place in
frank26080115	0:bf7b9fba3924	95	memory. This place is detemined by the length of the first
frank26080115	0:bf7b9fba3924	96	packet (len1). */
frank26080115	0:bf7b9fba3924	97	uip_len = len2 + UIP_TCPIP_HLEN;
frank26080115	0:bf7b9fba3924	98	#if UIP_CONF_IPV6
frank26080115	0:bf7b9fba3924	99	/* For IPv6, the IP length field does not include the IPv6 IP header
frank26080115	0:bf7b9fba3924	100	length. */
frank26080115	0:bf7b9fba3924	101	BUF->len[0] = ((uip_len - UIP_IPH_LEN) >> 8);
frank26080115	0:bf7b9fba3924	102	BUF->len[1] = ((uip_len - UIP_IPH_LEN) & 0xff);
frank26080115	0:bf7b9fba3924	103	#else /* UIP_CONF_IPV6 */
frank26080115	0:bf7b9fba3924	104	BUF->len[0] = uip_len >> 8;
frank26080115	0:bf7b9fba3924	105	BUF->len[1] = uip_len & 0xff;
frank26080115	0:bf7b9fba3924	106	#endif /* UIP_CONF_IPV6 */
frank26080115	0:bf7b9fba3924	107
frank26080115	0:bf7b9fba3924	108	/* uip_appdata += len1;*/
frank26080115	0:bf7b9fba3924	109	memcpy(uip_appdata, (u8_t *)uip_appdata + len1, len2);
frank26080115	0:bf7b9fba3924	110
frank26080115	0:bf7b9fba3924	111	uip_add32(BUF->seqno, len1);
frank26080115	0:bf7b9fba3924	112	BUF->seqno[0] = uip_acc32[0];
frank26080115	0:bf7b9fba3924	113	BUF->seqno[1] = uip_acc32[1];
frank26080115	0:bf7b9fba3924	114	BUF->seqno[2] = uip_acc32[2];
frank26080115	0:bf7b9fba3924	115	BUF->seqno[3] = uip_acc32[3];
frank26080115	0:bf7b9fba3924	116
frank26080115	0:bf7b9fba3924	117	/* Recalculate the TCP checksum. */
frank26080115	0:bf7b9fba3924	118	BUF->tcpchksum = 0;
frank26080115	0:bf7b9fba3924	119	BUF->tcpchksum = ~(uip_tcpchksum());
frank26080115	0:bf7b9fba3924	120
frank26080115	0:bf7b9fba3924	121	#if !UIP_CONF_IPV6
frank26080115	0:bf7b9fba3924	122	/* Recalculate the IP checksum. */
frank26080115	0:bf7b9fba3924	123	BUF->ipchksum = 0;
frank26080115	0:bf7b9fba3924	124	BUF->ipchksum = ~(uip_ipchksum());
frank26080115	0:bf7b9fba3924	125	#endif /* UIP_CONF_IPV6 */
frank26080115	0:bf7b9fba3924	126
frank26080115	0:bf7b9fba3924	127	/* Transmit the second packet. */
frank26080115	0:bf7b9fba3924	128	/* uip_fw_output();*/
frank26080115	0:bf7b9fba3924	129	tcpip_output();
frank26080115	0:bf7b9fba3924	130	} else {
frank26080115	0:bf7b9fba3924	131	/* uip_fw_output();*/
frank26080115	0:bf7b9fba3924	132	tcpip_output();
frank26080115	0:bf7b9fba3924	133	}
frank26080115	0:bf7b9fba3924	134
frank26080115	0:bf7b9fba3924	135	}
frank26080115	0:bf7b9fba3924	136	/-----------------------------------------------------------------------------/

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Type:	Program
Created:	20 Mar 2011
Imports:	199
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	0
Followers:	7

EMAC/uIP/uip/uip-split.c@0:bf7b9fba3924, 2011-03-20 (annotated)

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