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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2010-07-13 15:12:40 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2010-07-13 15:12:40 +0000 |
commit | 651be58ca1824db42ffea1dad6f5bf0e41bebf8e (patch) | |
tree | c45dbdd3ae1509470c5d91e066c3269a653adc19 /nuttx/include/net | |
parent | 7569e53f92cc6c313c8642a8cc53dfacea63382b (diff) | |
download | px4-nuttx-651be58ca1824db42ffea1dad6f5bf0e41bebf8e.tar.gz px4-nuttx-651be58ca1824db42ffea1dad6f5bf0e41bebf8e.tar.bz2 px4-nuttx-651be58ca1824db42ffea1dad6f5bf0e41bebf8e.zip |
Add IP options
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2792 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/include/net')
-rw-r--r-- | nuttx/include/net/uip/uip.h | 56 |
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 ****************************************************************************/ |