Breaking uip.c into smaller functions/files

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@374 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 212 insertions, 0 deletions

diff --git a/nuttx/net/uip/uip-chksum.c b/nuttx/net/uip/uip-chksum.c
new file mode 100644
index 000000000..ebf814e8b
--- /dev/null
+++ b/nuttx/net/uip/uip-chksum.c
@@ -0,0 +1,212 @@
+/****************************************************************************
+ * net/uip/uip-chksum.c
+ *
+ *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ *
+ * 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 NuttX 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 COPYRIGHT HOLDERS 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
+ * COPYRIGHT OWNER 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#ifdef CONFIG_NET
+
+#include <sys/types.h>
+#include <debug.h>
+
+#include <net/uip/uipopt.h>
+#include <net/uip/uip.h>
+#include <net/uip/uip-arch.h>
+
+#include "uip-internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+#define BUF ((struct uip_tcpip_hdr *)&dev->d_buf[UIP_LLH_LEN])
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+#if !UIP_ARCH_CHKSUM
+static uint16 chksum(uint16 sum, const uint8 *data, uint16 len)
+{
+  uint16 t;
+  const uint8 *dataptr;
+  const uint8 *last_byte;
+
+  dataptr = data;
+  last_byte = data + len - 1;
+
+  while(dataptr < last_byte)
+    {
+      /* At least two more bytes */
+
+      t = (dataptr[0] << 8) + dataptr[1];
+      sum += t;
+      if (sum < t)
+        {
+          sum++; /* carry */
+        }
+      dataptr += 2;
+    }
+
+  if (dataptr == last_byte)
+    {
+      t = (dataptr[0] << 8) + 0;
+      sum += t;
+      if (sum < t)
+        {
+          sum++; /* carry */
+        }
+    }
+
+  /* Return sum in host byte order. */
+
+  return sum;
+}
+
+static uint16 upper_layer_chksum(struct uip_driver_s *dev, uint8 proto)
+{
+  uint16 upper_layer_len;
+  uint16 sum;
+
+#ifdef CONFIG_NET_IPv6
+  upper_layer_len = (((uint16)(BUF->len[0]) << 8) + BUF->len[1]);
+#else /* CONFIG_NET_IPv6 */
+  upper_layer_len = (((uint16)(BUF->len[0]) << 8) + BUF->len[1]) - UIP_IPH_LEN;
+#endif /* CONFIG_NET_IPv6 */
+
+  /* First sum pseudoheader. */
+
+  /* IP protocol and length fields. This addition cannot carry. */
+  sum = upper_layer_len + proto;
+
+  /* Sum IP source and destination addresses. */
+  sum = chksum(sum, (uint8 *)&BUF->srcipaddr, 2 * sizeof(uip_ipaddr_t));
+
+  /* Sum TCP header and data. */
+  sum = chksum(sum, &dev->d_buf[UIP_IPH_LEN + UIP_LLH_LEN], upper_layer_len);
+
+  return (sum == 0) ? 0xffff : htons(sum);
+}
+
+#ifdef CONFIG_NET_IPv6
+static uint16 uip_icmp6chksum(struct uip_driver_s *dev)
+{
+  return upper_layer_chksum(dev, UIP_PROTO_ICMP6);
+}
+#endif /* CONFIG_NET_IPv6 */
+
+#endif /* UIP_ARCH_CHKSUM */
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/* Calculate the Internet checksum over a buffer. */
+
+#if !UIP_ARCH_ADD32
+void uip_add32(uint8 *op32, uint16 op16)
+{
+  uip_acc32[3] = op32[3] + (op16 & 0xff);
+  uip_acc32[2] = op32[2] + (op16 >> 8);
+  uip_acc32[1] = op32[1];
+  uip_acc32[0] = op32[0];
+
+  if (uip_acc32[2] < (op16 >> 8))
+    {
+      ++uip_acc32[1];
+      if (uip_acc32[1] == 0)
+        {
+          ++uip_acc32[0];
+        }
+    }
+
+  if (uip_acc32[3] < (op16 & 0xff))
+    {
+      ++uip_acc32[2];
+      if (uip_acc32[2] == 0)
+        {
+          ++uip_acc32[1];
+          if (uip_acc32[1] == 0)
+            {
+              ++uip_acc32[0];
+            }
+        }
+    }
+}
+#endif /* UIP_ARCH_ADD32 */
+
+#if !UIP_ARCH_CHKSUM
+uint16 uip_chksum(uint16 *data, uint16 len)
+{
+  return htons(chksum(0, (uint8 *)data, len));
+}
+
+/* Calculate the IP header checksum of the packet header in d_buf. */
+
+#ifndef UIP_ARCH_IPCHKSUM
+uint16 uip_ipchksum(struct uip_driver_s *dev)
+{
+  uint16 sum;
+
+  sum = chksum(0, &dev->d_buf[UIP_LLH_LEN], UIP_IPH_LEN);
+  return (sum == 0) ? 0xffff : htons(sum);
+}
+#endif
+
+/* Calculate the TCP checksum of the packet in d_buf and d_appdata. */
+
+uint16 uip_tcpchksum(struct uip_driver_s *dev)
+{
+  return upper_layer_chksum(dev, UIP_PROTO_TCP);
+}
+
+/* Calculate the UDP checksum of the packet in d_buf and d_appdata. */
+
+#ifdef CONFIG_NET_UDP_CHECKSUMS
+uint16 uip_udpchksum(struct uip_driver_s *dev)
+{
+  return upper_layer_chksum(dev, UIP_PROTO_UDP);
+}
+#endif /* UIP_UDP_CHECKSUMS */
+#endif /* UIP_ARCH_CHKSUM */
+
+#endif /* CONFIG_NET */