diff options
Diffstat (limited to 'nuttx/net/uip/uip_tcpseqno.c')
| -rwxr-xr-x | nuttx/net/uip/uip_tcpseqno.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/nuttx/net/uip/uip_tcpseqno.c b/nuttx/net/uip/uip_tcpseqno.c new file mode 100755 index 000000000..eab3a054a --- /dev/null +++ b/nuttx/net/uip/uip_tcpseqno.c @@ -0,0 +1,173 @@ +/**************************************************************************** + * net/uip/uip_tcpseqno.c + * + * Copyright (C) 2007-2009 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * Large parts of this file were leveraged from uIP logic: + * + * Copyright (c) 2001-2003, Adam Dunkels. + * 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. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. + * + ****************************************************************************/ + +/**************************************************************************** + * Compilation Switches + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> +#if defined(CONFIG_NET) && defined(CONFIG_NET_TCP) + +#include <stdint.h> +#include <debug.h> + +#include <nuttx/net/uip/uipopt.h> +#include <nuttx/net/uip/uip.h> +#include <nuttx/net/uip/uip-arch.h> + +#include "uip_internal.h" + +/**************************************************************************** + * Public Data + ****************************************************************************/ + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +/* g_tcpsequence is used to generate initial TCP sequence numbers */ + +static uint32_t g_tcpsequence; + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: uip_tcpsetsequence + * + * Description: + * Set the TCP/IP sequence number + * + * Assumptions: + * This function may called from the interrupt level + * + ****************************************************************************/ + +void uip_tcpsetsequence(FAR uint8_t *seqno, uint32_t value) +{ + /* Copy the sequence number in network (big-endian) order */ + + *seqno++ = value >> 24; + *seqno++ = (value >> 16) & 0xff; + *seqno++ = (value >> 8) & 0xff; + *seqno = value & 0xff; +} + +/**************************************************************************** + * Name: uip_tcpgetsequence + * + * Description: + * Get the TCP/IP sequence number + * + * Assumptions: + * This function may called from the interrupt level + * + ****************************************************************************/ + +uint32_t uip_tcpgetsequence(FAR uint8_t *seqno) +{ + uint32_t value; + + /* Combine the sequence number from network (big-endian) order */ + + value = (uint32_t)seqno[0] << 24 | + (uint32_t)seqno[1] << 16 | + (uint32_t)seqno[2] << 8 | + (uint32_t)seqno[3]; + return value; +} + +/**************************************************************************** + * Name: uip_tcpaddsequence + * + * Description: + * Add the length to get the next TCP sequence number. + * + * Assumptions: + * This function may called from the interrupt level + * + ****************************************************************************/ + +uint32_t uip_tcpaddsequence(FAR uint8_t *seqno, uint16_t len) +{ + return uip_tcpgetsequence(seqno) + (uint32_t)len; +} + +/**************************************************************************** + * Name: uip_tcpinitsequence + * + * Description: + * Set the (initial) the TCP/IP sequence number when a TCP connection is + * established. + * + * Assumptions: + * This function may called from the interrupt level + * + ****************************************************************************/ + +void uip_tcpinitsequence(FAR uint8_t *seqno) +{ + uip_tcpsetsequence(seqno, g_tcpsequence); +} + +/**************************************************************************** + * Name: uip_tcpnextsequence + * + * Description: + * Increment the TCP/IP sequence number + * + * Assumptions: + * This function is called from the interrupt level + * + ****************************************************************************/ + +void uip_tcpnextsequence(void) +{ + g_tcpsequence++; +} + +#endif /* CONFIG_NET && CONFIG_NET_TCP */ |