usr/src/stand/lib/inet/ipv4_impl.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Internal IPv4 implementation-specific definitions
  27  */
  28
  29 #ifndef _IPV4_IMPL_H
  30 #define _IPV4_IMPL_H
  31
  32 #pragma ident   "%Z%%M% %I%     %E% SMI"
  33
  34 #ifdef  __cplusplus
  35 extern "C" {
  36 #endif
  37
  38 #define FRAG_MAX        (40)    /* max number of IP fragments per datagram */
  39 #define FRAG_SUCCESS    (0)     /* datagram reassembled ok */
  40 #define FRAG_DUP        (1)     /* duplicate ip fragment */
  41 #define FRAG_NOSLOTS    (2)     /* no more ip fragment slots */
  42 #define FRAG_ATTEMPTS   1       /* Try twice to get all the fragments */
  43
  44 /*
  45  * IP fragmentation data structure
  46  */
  47 struct ip_frag {
  48         int16_t         more;   /* Fragment bit (TRUE == MF, FALSE == No more */
  49         int16_t         offset; /* Offset within the encapsulated datagram */
  50         mblk_t          *mp;    /* Fragment including IP header */
  51         uint16_t        ipid;   /* fragment ident */
  52         int16_t         iplen;  /* IP datagram's length */
  53         int16_t         iphlen; /* Len of IP header */
  54         uint8_t         ipp;    /* IP protocol */
  55 };
  56
  57 /*
  58  * true offset is in 8 octet units. The high order 3 bits of the IP header
  59  * offset field are therefore used for fragmentation flags. Shift these
  60  * bits off to produce the true offset. The high order flag bit is unused
  61  * (what would be considered the sign bit). Still, we cast the callers
  62  * value as an unsigned quantity to ensure it is treated as positive.
  63  */
  64 #define IPV4_OFFSET(a)  ((uint16_t)(a) << 3)
  65
  66 #define IPV4_VERSION    4
  67 #define IPH_HDR_LENGTH(iph)     (((struct ip *)(iph))->ip_hl << 2)
  68
  69 /* ECN code points for IPv4 TOS byte and IPv6 traffic class octet. */
  70 #define IPH_ECN_NECT    0x0     /* Not ECN-Capabable Transport */
  71 #define IPH_ECN_ECT1    0x1     /* ECN-Capable Transport, ECT(1) */
  72 #define IPH_ECN_ECT0    0x2     /* ECN-Capable Transport, ECT(0) */
  73 #define IPH_ECN_CE      0x3     /* ECN-Congestion Experienced (CE) */
  74
  75 #define IPV4_VERSION                    4
  76 #define IP_VERSION                      IPV4_VERSION
  77 #define IP_SIMPLE_HDR_LENGTH_IN_WORDS   5
  78 #define IP_SIMPLE_HDR_LENGTH            20
  79 #define IP_MAX_HDR_LENGTH               60
  80
  81 #define IP_MIN_MTU                      (IP_MAX_HDR_LENGTH + 8) /* 68 bytes */
  82
  83 /*
  84  * IP routing table. IP addresses are in network-order.
  85  */
  86 struct routing {
  87         struct in_addr  dest;
  88         struct in_addr  gateway;
  89         uint8_t         flag;
  90 };
  91
  92 extern void             ipv4_raw_socket(struct inetboot_socket *, uint8_t);
  93 extern void             ipv4_socket_init(struct inetboot_socket *);
  94 extern int              ipv4_header_len(struct inetgram *);
  95 extern int              ipv4_input(int);
  96 extern int              ipv4_output(int, struct inetgram *);
  97 extern int              ipv4_tcp_output(int, mblk_t *);
  98 extern struct in_addr   *ipv4_get_route(uint8_t, struct in_addr *,
  99                             struct in_addr *);
 100
 101 #ifdef  __cplusplus
 102 }
 103 #endif
 104
 105 #endif /* _IPV4_IMPL_H */