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https://github.com/FreeRTOS/FreeRTOS-Kernel.git
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Some re-formatting of uip.c.
This commit is contained in:
Richard Barry
parent
2641267c85
commit
c7fbe1d601
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@ -19,13 +19,13 @@
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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@ -712,7 +712,7 @@ void uip_process( u8_t flag )
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uip_sappdata = uip_appdata = &uip_buf[UIP_IPTCPH_LEN + UIP_LLH_LEN];
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/* Check if we were invoked because of a poll request for a
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particular connection. */
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particular connection. */
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if( flag == UIP_POLL_REQUEST )
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{
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if( (uip_connr->tcpstateflags & UIP_TS_MASK) == UIP_ESTABLISHED && !uip_outstanding(uip_connr) )
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@ -809,7 +809,7 @@ void uip_process( u8_t flag )
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{
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case UIP_SYN_RCVD:
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/* In the SYN_RCVD state, we should retransmit our
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SYNACK. */
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SYNACK. */
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goto tcp_send_synack;
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#if UIP_ACTIVE_OPEN
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@ -895,24 +895,24 @@ void uip_process( u8_t flag )
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#endif /* UIP_CONF_IPV6 */
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/* Check the size of the packet. If the size reported to us in
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uip_len is smaller the size reported in the IP header, we assume
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that the packet has been corrupted in transit. If the size of
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uip_len is larger than the size reported in the IP packet header,
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the packet has been padded and we set uip_len to the correct
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value.. */
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uip_len is smaller the size reported in the IP header, we assume
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that the packet has been corrupted in transit. If the size of
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uip_len is larger than the size reported in the IP packet header,
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the packet has been padded and we set uip_len to the correct
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value.. */
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if( (BUF->len[ 0 ] << 8) + BUF->len[ 1 ] <= uip_len )
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{
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uip_len = ( BUF->len[ 0 ] << 8 ) + BUF->len[ 1 ];
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#if UIP_CONF_IPV6
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/* The length reported in the IPv6 header is the
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length of the payload that follows the
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header. However, uIP uses the uip_len variable
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for holding the size of the entire packet,
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including the IP header. For IPv4 this is not a
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problem as the length field in the IPv4 header
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contains the length of the entire packet. But
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for IPv6 we need to add the size of the IPv6
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header (40 bytes). */
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length of the payload that follows the
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header. However, uIP uses the uip_len variable
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for holding the size of the entire packet,
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including the IP header. For IPv4 this is not a
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problem as the length field in the IPv4 header
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contains the length of the entire packet. But
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for IPv6 we need to add the size of the IPv6
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header (40 bytes). */
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uip_len += 40;
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#endif /* UIP_CONF_IPV6 */
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}
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@ -1313,9 +1313,9 @@ udp_send:
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}
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/* If we didn't find and active connection that expected the packet,
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either this packet is an old duplicate, or this is a SYN packet
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destined for a connection in LISTEN. If the SYN flag isn't set,
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it is an old packet and we send a RST. */
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either this packet is an old duplicate, or this is a SYN packet
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destined for a connection in LISTEN. If the SYN flag isn't set,
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it is an old packet and we send a RST. */
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if( (BUF->flags & TCP_CTL) != TCP_SYN )
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{
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goto reset;
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@ -1366,8 +1366,8 @@ reset:
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BUF->ackno[ 0 ] = c;
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/* We also have to increase the sequence number we are
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acknowledging. If the least significant byte overflowed, we need
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to propagate the carry to the other bytes as well. */
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acknowledging. If the least significant byte overflowed, we need
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to propagate the carry to the other bytes as well. */
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if( ++BUF->ackno[ 3 ] == 0 )
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{
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if( ++BUF->ackno[ 2 ] == 0 )
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@ -1392,15 +1392,15 @@ reset:
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goto tcp_send_noconn;
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/* This label will be jumped to if we matched the incoming packet
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with a connection in LISTEN. In that case, we should create a new
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connection and send a SYNACK in return. */
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with a connection in LISTEN. In that case, we should create a new
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connection and send a SYNACK in return. */
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found_listen:
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/* First we check if there are any connections avaliable. Unused
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connections are kept in the same table as used connections, but
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unused ones have the tcpstate set to CLOSED. Also, connections in
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TIME_WAIT are kept track of and we'll use the oldest one if no
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CLOSED connections are found. Thanks to Eddie C. Dost for a very
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nice algorithm for the TIME_WAIT search. */
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connections are kept in the same table as used connections, but
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unused ones have the tcpstate set to CLOSED. Also, connections in
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TIME_WAIT are kept track of and we'll use the oldest one if no
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CLOSED connections are found. Thanks to Eddie C. Dost for a very
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nice algorithm for the TIME_WAIT search. */
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uip_connr = 0;
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for( c = 0; c < UIP_CONNS; ++c )
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{
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@ -1506,7 +1506,7 @@ tcp_send_syn:
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#endif /* UIP_ACTIVE_OPEN */
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/* We send out the TCP Maximum Segment Size option with our
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SYNACK. */
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SYNACK. */
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BUF->optdata[ 0 ] = TCP_OPT_MSS;
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BUF->optdata[ 1 ] = TCP_OPT_MSS_LEN;
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BUF->optdata[ 2 ] = ( UIP_TCP_MSS ) / 256;
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@ -1521,9 +1521,9 @@ found:
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uip_flags = 0;
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/* We do a very naive form of TCP reset processing; we just accept
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any RST and kill our connection. We should in fact check if the
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sequence number of this reset is wihtin our advertised window
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before we accept the reset. */
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any RST and kill our connection. We should in fact check if the
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sequence number of this reset is wihtin our advertised window
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before we accept the reset. */
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if( BUF->flags & TCP_RST )
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{
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uip_connr->tcpstateflags = UIP_CLOSED;
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@ -1534,17 +1534,17 @@ found:
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}
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/* Calculate the length of the data, if the application has sent
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any data to us. */
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any data to us. */
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c = ( BUF->tcpoffset >> 4 ) << 2;
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/* uip_len will contain the length of the actual TCP data. This is
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calculated by subtracing the length of the TCP header (in
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c) and the length of the IP header (20 bytes). */
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calculated by subtracing the length of the TCP header (in
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c) and the length of the IP header (20 bytes). */
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uip_len = uip_len - c - UIP_IPH_LEN;
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/* First, check if the sequence number of the incoming packet is
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what we're expecting next. If not, we send out an ACK with the
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correct numbers in. */
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what we're expecting next. If not, we send out an ACK with the
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correct numbers in. */
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if( !(((uip_connr->tcpstateflags & UIP_TS_MASK) == UIP_SYN_SENT) && ((BUF->flags & TCP_CTL) == (TCP_SYN | TCP_ACK))) )
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{
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if
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@ -1563,9 +1563,9 @@ found:
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}
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/* Next, check if the incoming segment acknowledges any outstanding
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data. If so, we update the sequence number, reset the length of
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the outstanding data, calculate RTT estimations, and reset the
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retransmission timer. */
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data. If so, we update the sequence number, reset the length of
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the outstanding data, calculate RTT estimations, and reset the
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retransmission timer. */
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if( (BUF->flags & TCP_ACK) && uip_outstanding(uip_connr) )
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{
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uip_add32( uip_connr->snd_nxt, uip_connr->len );
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@ -1623,9 +1623,9 @@ found:
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ESTABLISHED to LAST_ACK). */
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case UIP_SYN_RCVD:
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/* In SYN_RCVD we have sent out a SYNACK in response to a SYN, and
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we are waiting for an ACK that acknowledges the data we sent
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out the last time. Therefore, we want to have the UIP_ACKDATA
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flag set. If so, we enter the ESTABLISHED state. */
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we are waiting for an ACK that acknowledges the data we sent
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out the last time. Therefore, we want to have the UIP_ACKDATA
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flag set. If so, we enter the ESTABLISHED state. */
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if( uip_flags & UIP_ACKDATA )
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{
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uip_connr->tcpstateflags = UIP_ESTABLISHED;
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@ -1864,22 +1864,22 @@ appsend:
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if( uip_connr->len == 0 )
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{
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/* The application cannot send more than what is allowed by
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the mss (the minumum of the MSS and the available
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window). */
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the mss (the minumum of the MSS and the available
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window). */
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if( uip_slen > uip_connr->mss )
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{
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uip_slen = uip_connr->mss;
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}
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/* Remember how much data we send out now so that we know
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when everything has been acknowledged. */
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when everything has been acknowledged. */
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uip_connr->len = uip_slen;
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}
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else
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{
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/* If the application already had unacknowledged data, we
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make sure that the application does not send (i.e.,
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retransmit) out more than it previously sent out. */
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make sure that the application does not send (i.e.,
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retransmit) out more than it previously sent out. */
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uip_slen = uip_connr->len;
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}
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}
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@ -1889,7 +1889,7 @@ apprexmit:
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uip_appdata = uip_sappdata;
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/* If the application has data to be sent, or if the incoming
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packet had new data in it, we must send out a packet. */
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packet had new data in it, we must send out a packet. */
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if( uip_slen > 0 && uip_connr->len > 0 )
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{
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/* Add the length of the IP and TCP headers. */
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@ -2004,7 +2004,7 @@ apprexmit:
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goto drop;
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/* We jump here when we are ready to send the packet, and just want
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to set the appropriate TCP sequence numbers in the TCP header. */
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to set the appropriate TCP sequence numbers in the TCP header. */
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tcp_send_ack:
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BUF->flags = TCP_ACK;
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@ -2015,9 +2015,9 @@ tcp_send_noopts:
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BUF->tcpoffset = ( UIP_TCPH_LEN / 4 ) << 4;
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/* We're done with the input processing. We are now ready to send a
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reply. Our job is to fill in all the fields of the TCP and IP
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headers before calculating the checksum and finally send the
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packet. */
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reply. Our job is to fill in all the fields of the TCP and IP
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headers before calculating the checksum and finally send the
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packet. */
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tcp_send:
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BUF->ackno[ 0 ] = uip_connr->rcv_nxt[ 0 ];
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BUF->ackno[ 1 ] = uip_connr->rcv_nxt[ 1 ];
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