Add IP options

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2792 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 56 insertions, 0 deletions

diff --git a/nuttx/include/net/uip/uip.h b/nuttx/include/net/uip/uip.h
index fd9373666..a651b68f6 100644
--- a/nuttx/include/net/uip/uip.h
+++ b/nuttx/include/net/uip/uip.h
@@ -150,6 +150,62 @@
 # define UIP_IPH_LEN    20    /* Size of IP header */
 #endif
 
+/* IP Header Options:
+ *
+ * The basic 20-byte IP header can be extended by up to another 40 bytes
+ * (in units of 4 bytes) to provide IP options.  The format of a single IP
+ * option is as follows:
+ *
+ * Single byte options:
+ *
+ *   Type:         8-bits
+ *
+ * Multi-byte options:
+ *
+ *   Type:         8-bits
+ *   Length:       8-bits
+ *   Pointer:      8-bits:
+ *   Option Data: (depends on Length)
+ *
+ * The IP Option Type byte consists of the following subfields:
+ */
+ 
+#define IPOPT_TYPE_OPTION_SHIFT       (0)      /* Bits 0-5: Option number*/
+#define IPOPT_TYPE_OPTION_MASK        (0x1f << IPOPT_TYPE_OPTION_SHIFT)
+#  define IPOPT_TYPE_OPTION_END       (0  << IPOPT_TYPE_OPTION_SHIFT) /* End of options list */
+#  define IPOPT_TYPE_OPTION_NOOP      (1  << IPOPT_TYPE_OPTION_SHIFT) /* No operation */
+#  define IPOPT_TYPE_OPTION_SEC       (2  << IPOPT_TYPE_OPTION_SHIFT) /* Security */
+#  define IPOPT_TYPE_OPTION_LSRR      (3  << IPOPT_TYPE_OPTION_SHIFT) /* Loose source and record route */
+#  define IPOPT_TYPE_OPTION_TIMESTAMP (4  << IPOPT_TYPE_OPTION_SHIFT) /* Timestamp */
+#  define IPOPT_TYPE_OPTION_RR        (7  << IPOPT_TYPE_OPTION_SHIFT) /* Record route */
+#  define IPOPT_TYPE_OPTION_SSID      (8  << IPOPT_TYPE_OPTION_SHIFT) /* Stream ID */
+#  define IPOPT_TYPE_OPTION_SSRR      (9  << IPOPT_TYPE_OPTION_SHIFT) /* Strict source and record route */
+#  define IPOPT_TYPE_OPTION_RA        (20 << IPOPT_TYPE_OPTION_SHIFT) /* Router alert */
+#define IPOPT_TYPE_CLASS_SHIFT        (5)      /* Bits 5-6: Class */
+#define IPOPT_TYPE_CLASS_MASK         (3 << IPOPT_TYPE_CLASS_SHIFT)
+#  define IPOPT_TYPE_CLASS_CTRL       (0 << IPOPT_TYPE_CLASS_SHIFT) /* Control */
+#  define IPOPT_TYPE_CLASS_MEASURE    (2 << IPOPT_TYPE_CLASS_SHIFT) /* Debugging and measurement */
+#define IPOPT_TYPE_COPIED             (1 << 7) /* Bit 7: IP layer must copy option to each fragment */
+
+/* IP Option encoding macros */
+
+#define IPOPT_MKTYPE(copied,class,option) (copied|class|option)
+  
+#define IPOPT_MKOPTION8(copied,class,option) \
+  ((uint8_t)IPOPT_MKTYPE(copied,class,option))
+#define IPOPT_MKOPTION32(copied,class,option,len,ptr,data) \
+  ((uint32_t)IPORT_MKTYPE(copied,class,option) << 24 | \
+   (uint32_t)len << 16) | (uint32_t)data << 8 | (uint32_t)data)
+
+/* Some useful pre-defined IP options */
+
+#define IPOPT_END \
+  IPOPT_MKOPTION8(0, IPOPT_TYPE_CLASS_CTRL, IPOPT_TYPE_OPTION_END)
+#define IPOPT_NOOP \
+  IPOPT_MKOPTION8(0, IPOPT_TYPE_CLASS_CTRL, IPOPT_TYPE_OPTION_NOOP)
+#define IPOPT_RA \
+  IPOPT_MKOPTION32(IPOPT_TYPE_COPIED, IPOPT_TYPE_CLASS_CTRL, IPOPT_TYPE_OPTION_RA, 4, 0, 0)
+ 
 /****************************************************************************
  * Public Type Definitions
  ****************************************************************************/