FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip6.h

     /*      $NetBSD: ip6.h,v 1.23 2007/12/25 18:33:46 perry Exp $   */
     /*      $KAME: ip6.h,v 1.45 2003/06/05 04:46:38 keiichi Exp $   */
     
     /*
      * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the project nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    /*
     * Copyright (c) 1982, 1986, 1993
     *      The Regents of the University of California.  All rights reserved.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)ip.h        8.1 (Berkeley) 6/10/93
     */
    
    #ifndef _NETINET_IP6_H_
    #define _NETINET_IP6_H_
    
    /*
     * Definition for internet protocol version 6.
     * RFC 2460
     */
    
    struct ip6_hdr {
            union {
                    struct ip6_hdrctl {
                            u_int32_t ip6_un1_flow; /* 20 bits of flow-ID */
                            u_int16_t ip6_un1_plen; /* payload length */
                            u_int8_t  ip6_un1_nxt;  /* next header */
                            u_int8_t  ip6_un1_hlim; /* hop limit */
                    } ip6_un1;
                    u_int8_t ip6_un2_vfc;   /* 4 bits version, top 4 bits class */
            } ip6_ctlun;
            struct in6_addr ip6_src;        /* source address */
            struct in6_addr ip6_dst;        /* destination address */
    } __packed;
    
    #define ip6_vfc         ip6_ctlun.ip6_un2_vfc
    #define ip6_flow        ip6_ctlun.ip6_un1.ip6_un1_flow
    #define ip6_plen        ip6_ctlun.ip6_un1.ip6_un1_plen
    #define ip6_nxt         ip6_ctlun.ip6_un1.ip6_un1_nxt
    #define ip6_hlim        ip6_ctlun.ip6_un1.ip6_un1_hlim
    #define ip6_hops        ip6_ctlun.ip6_un1.ip6_un1_hlim
    
    #define IPV6_VERSION            0x60
    #define IPV6_VERSION_MASK       0xf0
    
    #if BYTE_ORDER == BIG_ENDIAN
    #define IPV6_FLOWINFO_MASK      0x0fffffff      /* flow info (28 bits) */
    #define IPV6_FLOWLABEL_MASK     0x000fffff      /* flow label (20 bits) */
    #else
   #if BYTE_ORDER == LITTLE_ENDIAN
   #define IPV6_FLOWINFO_MASK      0xffffff0f      /* flow info (28 bits) */
   #define IPV6_FLOWLABEL_MASK     0xffff0f00      /* flow label (20 bits) */
   #endif /* LITTLE_ENDIAN */
   #endif
   #if 1
   /* ECN bits proposed by Sally Floyd */
   #define IP6TOS_CE               0x01    /* congestion experienced */
   #define IP6TOS_ECT              0x02    /* ECN-capable transport */
   #endif
   
   #ifdef _KERNEL
   /*
    * for IPv6 pseudo header checksum
    * XXX nonstandard
    */
   struct ip6_hdr_pseudo {
           struct in6_addr ip6ph_src;
           struct in6_addr ip6ph_dst;
           u_int32_t       ip6ph_len;
           u_int8_t        ip6ph_zero[3];
           u_int8_t        ip6ph_nxt;
   } __packed;
   #endif
   
   /*
    * Extension Headers
    */
   
   struct  ip6_ext {
           u_int8_t ip6e_nxt;
           u_int8_t ip6e_len;
   } __packed;
   
   /* Hop-by-Hop options header */
   /* XXX should we pad it to force alignment on an 8-byte boundary? */
   struct ip6_hbh {
           u_int8_t ip6h_nxt;      /* next header */
           u_int8_t ip6h_len;      /* length in units of 8 octets */
           /* followed by options */
   } __packed;
   
   /* Destination options header */
   /* XXX should we pad it to force alignment on an 8-byte boundary? */
   struct ip6_dest {
           u_int8_t ip6d_nxt;      /* next header */
           u_int8_t ip6d_len;      /* length in units of 8 octets */
           /* followed by options */
   } __packed;
   
   /* Option types and related macros */
   #define IP6OPT_PAD1             0x00    /* 00 0 00000 */
   #define IP6OPT_PADN             0x01    /* 00 0 00001 */
   #define IP6OPT_JUMBO            0xC2    /* 11 0 00010 = 194 */
   #define IP6OPT_NSAP_ADDR        0xC3    /* 11 0 00011 */
   #define IP6OPT_TUNNEL_LIMIT     0x04    /* 00 0 00100 */
   #define IP6OPT_RTALERT          0x05    /* 00 0 00101 (KAME definition) */
   #define IP6OPT_ROUTER_ALERT     0x05    /* (RFC3542 def, recommended) */
   
   #define IP6OPT_RTALERT_LEN      4
   #define IP6OPT_RTALERT_MLD      0       /* Datagram contains an MLD message */
   #define IP6OPT_RTALERT_RSVP     1       /* Datagram contains an RSVP message */
   #define IP6OPT_RTALERT_ACTNET   2       /* contains an Active Networks msg */
   #define IP6OPT_MINLEN           2
   
   #define IP6OPT_TYPE(o)          ((o) & 0xC0)
   #define IP6OPT_TYPE_SKIP        0x00
   #define IP6OPT_TYPE_DISCARD     0x40
   #define IP6OPT_TYPE_FORCEICMP   0x80
   #define IP6OPT_TYPE_ICMP        0xC0
   
   #define IP6OPT_MUTABLE          0x20
   
   /* IPv6 options: common part */
   struct ip6_opt {
           u_int8_t ip6o_type;
           u_int8_t ip6o_len;
   } __packed;
   
   /* Jumbo Payload Option */
   struct ip6_opt_jumbo {
           u_int8_t ip6oj_type;
           u_int8_t ip6oj_len;
           u_int8_t ip6oj_jumbo_len[4];
   } __packed;
   #define IP6OPT_JUMBO_LEN 6
   
   /* NSAP Address Option */
   struct ip6_opt_nsap {
           u_int8_t ip6on_type;
           u_int8_t ip6on_len;
           u_int8_t ip6on_src_nsap_len;
           u_int8_t ip6on_dst_nsap_len;
           /* followed by source NSAP */
           /* followed by destination NSAP */
   } __packed;
   
   /* Tunnel Limit Option */
   struct ip6_opt_tunnel {
           u_int8_t ip6ot_type;
           u_int8_t ip6ot_len;
           u_int8_t ip6ot_encap_limit;
   } __packed;
   
   /* Router Alert Option */
   struct ip6_opt_router {
           u_int8_t ip6or_type;
           u_int8_t ip6or_len;
           u_int8_t ip6or_value[2];
   } __packed;
   /* Router alert values (in network byte order) */
   #if BYTE_ORDER == BIG_ENDIAN
   #define IP6_ALERT_MLD   0x0000
   #define IP6_ALERT_RSVP  0x0001
   #define IP6_ALERT_AN    0x0002
   #else
   #if BYTE_ORDER == LITTLE_ENDIAN
   #define IP6_ALERT_MLD   0x0000
   #define IP6_ALERT_RSVP  0x0100
   #define IP6_ALERT_AN    0x0200
   #endif /* LITTLE_ENDIAN */
   #endif
   
   /* Routing header */
   struct ip6_rthdr {
           u_int8_t  ip6r_nxt;     /* next header */
           u_int8_t  ip6r_len;     /* length in units of 8 octets */
           u_int8_t  ip6r_type;    /* routing type */
           u_int8_t  ip6r_segleft; /* segments left */
           /* followed by routing type specific data */
   } __packed;
   
   /* Type 0 Routing header */
   struct ip6_rthdr0 {
           u_int8_t  ip6r0_nxt;            /* next header */
           u_int8_t  ip6r0_len;            /* length in units of 8 octets */
           u_int8_t  ip6r0_type;           /* always zero */
           u_int8_t  ip6r0_segleft;        /* segments left */
           u_int32_t ip6r0_reserved;       /* reserved field */
   } __packed;
   
   /* Fragment header */
   struct ip6_frag {
           u_int8_t  ip6f_nxt;             /* next header */
           u_int8_t  ip6f_reserved;        /* reserved field */
           u_int16_t ip6f_offlg;           /* offset, reserved, and flag */
           u_int32_t ip6f_ident;           /* identification */
   } __packed;
   
   #if BYTE_ORDER == BIG_ENDIAN
   #define IP6F_OFF_MASK           0xfff8  /* mask out offset from _offlg */
   #define IP6F_RESERVED_MASK      0x0006  /* reserved bits in ip6f_offlg */
   #define IP6F_MORE_FRAG          0x0001  /* more-fragments flag */
   #else /* BYTE_ORDER == LITTLE_ENDIAN */
   #define IP6F_OFF_MASK           0xf8ff  /* mask out offset from _offlg */
   #define IP6F_RESERVED_MASK      0x0600  /* reserved bits in ip6f_offlg */
   #define IP6F_MORE_FRAG          0x0100  /* more-fragments flag */
   #endif /* BYTE_ORDER == LITTLE_ENDIAN */
   
   /*
    * Internet implementation parameters.
    */
   #define IPV6_MAXHLIM    255     /* maximum hoplimit */
   #define IPV6_DEFHLIM    64      /* default hlim */
   #define IPV6_FRAGTTL    120     /* ttl for fragment packets, in slowtimo tick */
   #define IPV6_HLIMDEC    1       /* subtracted when forwarding */
   
   #define IPV6_MMTU       1280    /* minimal MTU and reassembly. 1024 + 256 */
   #define IPV6_MAXPACKET  65535   /* ip6 max packet size without Jumbo payload*/
   
   #ifdef _KERNEL
   /*
    * IP6_EXTHDR_GET ensures that intermediate protocol header (from "off" to
    * "len") is located in single mbuf, on contiguous memory region.
    * The pointer to the region will be returned to pointer variable "val",
    * with type "typ".
    * IP6_EXTHDR_GET0 does the same, except that it aligns the structure at the
    * very top of mbuf.  GET0 is likely to make memory copy than GET.
    *
    * XXX we're now testing this, needs m_pulldown()
    */
   #define IP6_EXTHDR_GET(val, typ, m, off, len) \
   do {                                                                    \
           struct mbuf *_t;                                                \
           int _tmp;                                                       \
           if ((m)->m_len >= (off) + (len))                                \
                   (val) = (typ)(mtod((m), char *) + (off));               \
           else {                                                          \
                   _t = m_pulldown((m), (off), (len), &_tmp);              \
                   if (_t) {                                               \
                           if (_t->m_len < _tmp + (len))                   \
                                   panic("m_pulldown malfunction");        \
                           (val) = (typ)(mtod(_t, char *) + _tmp); \
                   } else {                                                \
                           (val) = (typ)NULL;                              \
                           (m) = NULL;                                     \
                   }                                                       \
           }                                                               \
   } while (/*CONSTCOND*/ 0)
   
   #define IP6_EXTHDR_GET0(val, typ, m, off, len) \
   do {                                                                    \
           struct mbuf *_t;                                                \
           if ((off) == 0 && (m)->m_len >= len)                            \
                   (val) = (typ)mtod((m), void *);                 \
           else {                                                          \
                   _t = m_pulldown((m), (off), (len), NULL);               \
                   if (_t) {                                               \
                           if (_t->m_len < (len))                          \
                                   panic("m_pulldown malfunction");        \
                           (val) = (typ)mtod(_t, void *);                  \
                   } else {                                                \
                           (val) = (typ)NULL;                              \
                           (m) = NULL;                                     \
                   }                                                       \
           }                                                               \
   } while (/*CONSTCOND*/ 0)
   #endif /*_KERNEL*/
   
   #endif /* !_NETINET_IP6_H_ */

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