ip6.h 5.3 KB

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  1. /* Copyright (C) 1991-1997, 2001, 2003, 2006 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. The GNU C Library is free software; you can redistribute it and/or
  4. modify it under the terms of the GNU Lesser General Public
  5. License as published by the Free Software Foundation; either
  6. version 2.1 of the License, or (at your option) any later version.
  7. The GNU C Library is distributed in the hope that it will be useful,
  8. but WITHOUT ANY WARRANTY; without even the implied warranty of
  9. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  10. Lesser General Public License for more details.
  11. You should have received a copy of the GNU Lesser General Public
  12. License along with the GNU C Library; if not, write to the Free
  13. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  14. 02111-1307 USA. */
  15. #ifndef _NETINET_IP6_H
  16. #define _NETINET_IP6_H 1
  17. #include <inttypes.h>
  18. #include <netinet/in.h>
  19. struct ip6_hdr
  20. {
  21. union
  22. {
  23. struct ip6_hdrctl
  24. {
  25. uint32_t ip6_un1_flow; /* 4 bits version, 8 bits TC,
  26. 20 bits flow-ID */
  27. uint16_t ip6_un1_plen; /* payload length */
  28. uint8_t ip6_un1_nxt; /* next header */
  29. uint8_t ip6_un1_hlim; /* hop limit */
  30. } ip6_un1;
  31. uint8_t ip6_un2_vfc; /* 4 bits version, top 4 bits tclass */
  32. } ip6_ctlun;
  33. struct in6_addr ip6_src; /* source address */
  34. struct in6_addr ip6_dst; /* destination address */
  35. };
  36. #define ip6_vfc ip6_ctlun.ip6_un2_vfc
  37. #define ip6_flow ip6_ctlun.ip6_un1.ip6_un1_flow
  38. #define ip6_plen ip6_ctlun.ip6_un1.ip6_un1_plen
  39. #define ip6_nxt ip6_ctlun.ip6_un1.ip6_un1_nxt
  40. #define ip6_hlim ip6_ctlun.ip6_un1.ip6_un1_hlim
  41. #define ip6_hops ip6_ctlun.ip6_un1.ip6_un1_hlim
  42. /* Generic extension header. */
  43. struct ip6_ext
  44. {
  45. uint8_t ip6e_nxt; /* next header. */
  46. uint8_t ip6e_len; /* length in units of 8 octets. */
  47. };
  48. /* Hop-by-Hop options header. */
  49. struct ip6_hbh
  50. {
  51. uint8_t ip6h_nxt; /* next header. */
  52. uint8_t ip6h_len; /* length in units of 8 octets. */
  53. /* followed by options */
  54. };
  55. /* Destination options header */
  56. struct ip6_dest
  57. {
  58. uint8_t ip6d_nxt; /* next header */
  59. uint8_t ip6d_len; /* length in units of 8 octets */
  60. /* followed by options */
  61. };
  62. /* Routing header */
  63. struct ip6_rthdr
  64. {
  65. uint8_t ip6r_nxt; /* next header */
  66. uint8_t ip6r_len; /* length in units of 8 octets */
  67. uint8_t ip6r_type; /* routing type */
  68. uint8_t ip6r_segleft; /* segments left */
  69. /* followed by routing type specific data */
  70. };
  71. /* Type 0 Routing header */
  72. struct ip6_rthdr0
  73. {
  74. uint8_t ip6r0_nxt; /* next header */
  75. uint8_t ip6r0_len; /* length in units of 8 octets */
  76. uint8_t ip6r0_type; /* always zero */
  77. uint8_t ip6r0_segleft; /* segments left */
  78. uint8_t ip6r0_reserved; /* reserved field */
  79. uint8_t ip6r0_slmap[3]; /* strict/loose bit map */
  80. /* followed by up to 127 struct in6_addr */
  81. struct in6_addr ip6r0_addr[0];
  82. };
  83. /* Fragment header */
  84. struct ip6_frag
  85. {
  86. uint8_t ip6f_nxt; /* next header */
  87. uint8_t ip6f_reserved; /* reserved field */
  88. uint16_t ip6f_offlg; /* offset, reserved, and flag */
  89. uint32_t ip6f_ident; /* identification */
  90. };
  91. #if BYTE_ORDER == BIG_ENDIAN
  92. # define IP6F_OFF_MASK 0xfff8 /* mask out offset from _offlg */
  93. # define IP6F_RESERVED_MASK 0x0006 /* reserved bits in ip6f_offlg */
  94. # define IP6F_MORE_FRAG 0x0001 /* more-fragments flag */
  95. #else /* BYTE_ORDER == LITTLE_ENDIAN */
  96. # define IP6F_OFF_MASK 0xf8ff /* mask out offset from _offlg */
  97. # define IP6F_RESERVED_MASK 0x0600 /* reserved bits in ip6f_offlg */
  98. # define IP6F_MORE_FRAG 0x0100 /* more-fragments flag */
  99. #endif
  100. /* IPv6 options */
  101. struct ip6_opt
  102. {
  103. uint8_t ip6o_type;
  104. uint8_t ip6o_len;
  105. };
  106. /* The high-order 3 bits of the option type define the behavior
  107. * when processing an unknown option and whether or not the option
  108. * content changes in flight.
  109. */
  110. #define IP6OPT_TYPE(o) ((o) & 0xc0)
  111. #define IP6OPT_TYPE_SKIP 0x00
  112. #define IP6OPT_TYPE_DISCARD 0x40
  113. #define IP6OPT_TYPE_FORCEICMP 0x80
  114. #define IP6OPT_TYPE_ICMP 0xc0
  115. #define IP6OPT_TYPE_MUTABLE 0x20
  116. /* Special option types for padding. */
  117. #define IP6OPT_PAD1 0
  118. #define IP6OPT_PADN 1
  119. #define IP6OPT_JUMBO 0xc2
  120. #define IP6OPT_NSAP_ADDR 0xc3
  121. #define IP6OPT_TUNNEL_LIMIT 0x04
  122. #define IP6OPT_ROUTER_ALERT 0x05
  123. /* Jumbo Payload Option */
  124. struct ip6_opt_jumbo
  125. {
  126. uint8_t ip6oj_type;
  127. uint8_t ip6oj_len;
  128. uint8_t ip6oj_jumbo_len[4];
  129. };
  130. #define IP6OPT_JUMBO_LEN 6
  131. /* NSAP Address Option */
  132. struct ip6_opt_nsap
  133. {
  134. uint8_t ip6on_type;
  135. uint8_t ip6on_len;
  136. uint8_t ip6on_src_nsap_len;
  137. uint8_t ip6on_dst_nsap_len;
  138. /* followed by source NSAP */
  139. /* followed by destination NSAP */
  140. };
  141. /* Tunnel Limit Option */
  142. struct ip6_opt_tunnel
  143. {
  144. uint8_t ip6ot_type;
  145. uint8_t ip6ot_len;
  146. uint8_t ip6ot_encap_limit;
  147. };
  148. /* Router Alert Option */
  149. struct ip6_opt_router
  150. {
  151. uint8_t ip6or_type;
  152. uint8_t ip6or_len;
  153. uint8_t ip6or_value[2];
  154. };
  155. /* Router alert values (in network byte order) */
  156. #if BYTE_ORDER == BIG_ENDIAN
  157. # define IP6_ALERT_MLD 0x0000
  158. # define IP6_ALERT_RSVP 0x0001
  159. # define IP6_ALERT_AN 0x0002
  160. #else /* BYTE_ORDER == LITTLE_ENDING */
  161. # define IP6_ALERT_MLD 0x0000
  162. # define IP6_ALERT_RSVP 0x0100
  163. # define IP6_ALERT_AN 0x0200
  164. #endif
  165. #endif /* netinet/ip6.h */