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Add IP options

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2792 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2010-07-13 15:12:40 +00:00
parent a3910e4b02
commit 546c6929f7
1 changed files with 56 additions and 0 deletions
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56
include/net/uip/uip.h
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@ -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
****************************************************************************/