Home | History | Annotate | Download | only in linux 
      1 #ifndef _IPV6_H
      2 #define _IPV6_H
      3 
      4 #include <asm/byteorder.h>
      5 
      6 /* The latest drafts declared increase in minimal mtu up to 1280. */
      7 
      8 #define IPV6_MIN_MTU	1280
      9 
     10 /*
     11  *	Advanced API
     12  *	source interface/address selection, source routing, etc...
     13  *	*under construction*
     14  */
     15 
     16 
     17 #define IPV6_SRCRT_STRICT	0x01	/* Deprecated; will be removed */
     18 #define IPV6_SRCRT_TYPE_0	0	/* Deprecated; will be removed */
     19 #define IPV6_SRCRT_TYPE_2	2	/* IPv6 type 2 Routing Header	*/
     20 
     21 /*
     22  *	routing header
     23  */
     24 struct ipv6_rt_hdr {
     25 	__u8		nexthdr;
     26 	__u8		hdrlen;
     27 	__u8		type;
     28 	__u8		segments_left;
     29 
     30 	/*
     31 	 *	type specific data
     32 	 *	variable length field
     33 	 */
     34 };
     35 
     36 
     37 struct ipv6_opt_hdr {
     38 	__u8 		nexthdr;
     39 	__u8 		hdrlen;
     40 	/*
     41 	 * TLV encoded option data follows.
     42 	 */
     43 } __attribute__((packed));	/* required for some archs */
     44 
     45 #define ipv6_destopt_hdr ipv6_opt_hdr
     46 #define ipv6_hopopt_hdr  ipv6_opt_hdr
     47 
     48 
     49 /*
     50  *	routing header type 0 (used in cmsghdr struct)
     51  */
     52 
     53 struct rt0_hdr {
     54 	struct ipv6_rt_hdr	rt_hdr;
     55 	__u32			reserved;
     56 	struct in6_addr		addr[0];
     57 
     58 #define rt0_type		rt_hdr.type
     59 };
     60 
     61 /*
     62  *	routing header type 2
     63  */
     64 
     65 struct rt2_hdr {
     66 	struct ipv6_rt_hdr	rt_hdr;
     67 	__u32			reserved;
     68 	struct in6_addr		addr;
     69 
     70 #define rt2_type		rt_hdr.type
     71 };
     72 
     73 /*
     74  *	home address option in destination options header
     75  */
     76 
     77 struct ipv6_destopt_hao {
     78 	__u8			type;
     79 	__u8			length;
     80 	struct in6_addr		addr;
     81 } __attribute__((packed));
     82 
     83 /*
     84  *	IPv6 fixed header
     85  *
     86  *	BEWARE, it is incorrect. The first 4 bits of flow_lbl
     87  *	are glued to priority now, forming "class".
     88  */
     89 
     90 struct ipv6hdr {
     91 #if defined(__LITTLE_ENDIAN_BITFIELD)
     92 	__u8			priority:4,
     93 				version:4;
     94 #elif defined(__BIG_ENDIAN_BITFIELD)
     95 	__u8			version:4,
     96 				priority:4;
     97 #else
     98 #error	"Please fix <asm/byteorder.h>"
     99 #endif
    100 	__u8			flow_lbl[3];
    101 
    102 	__be16			payload_len;
    103 	__u8			nexthdr;
    104 	__u8			hop_limit;
    105 
    106 	struct	in6_addr	saddr;
    107 	struct	in6_addr	daddr;
    108 };
    109 
    110 
    111 /* index values for the variables in ipv6_devconf */
    112 enum {
    113 	DEVCONF_FORWARDING = 0,
    114 	DEVCONF_HOPLIMIT,
    115 	DEVCONF_MTU6,
    116 	DEVCONF_ACCEPT_RA,
    117 	DEVCONF_ACCEPT_REDIRECTS,
    118 	DEVCONF_AUTOCONF,
    119 	DEVCONF_DAD_TRANSMITS,
    120 	DEVCONF_RTR_SOLICITS,
    121 	DEVCONF_RTR_SOLICIT_INTERVAL,
    122 	DEVCONF_RTR_SOLICIT_DELAY,
    123 	DEVCONF_USE_TEMPADDR,
    124 	DEVCONF_TEMP_VALID_LFT,
    125 	DEVCONF_TEMP_PREFERED_LFT,
    126 	DEVCONF_REGEN_MAX_RETRY,
    127 	DEVCONF_MAX_DESYNC_FACTOR,
    128 	DEVCONF_MAX_ADDRESSES,
    129 	DEVCONF_FORCE_MLD_VERSION,
    130 	DEVCONF_ACCEPT_RA_DEFRTR,
    131 	DEVCONF_ACCEPT_RA_PINFO,
    132 	DEVCONF_ACCEPT_RA_RTR_PREF,
    133 	DEVCONF_RTR_PROBE_INTERVAL,
    134 	DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
    135 	DEVCONF_PROXY_NDP,
    136 	DEVCONF_OPTIMISTIC_DAD,
    137 	DEVCONF_ACCEPT_SOURCE_ROUTE,
    138 	DEVCONF_MC_FORWARDING,
    139 	DEVCONF_DISABLE_IPV6,
    140 	DEVCONF_ACCEPT_DAD,
    141 	DEVCONF_FORCE_TLLAO,
    142 	DEVCONF_MAX
    143 };
    144 
    145 
    146 #endif /* _IPV6_H */
    147