The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*      $FreeBSD$       */
    2 /*      $KAME: ip6.h,v 1.18 2001/03/29 05:34:30 itojun Exp $    */
    3 
    4 /*
    5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the project nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 /*
   34  * Copyright (c) 1982, 1986, 1993
   35  *      The Regents of the University of California.  All rights reserved.
   36  *
   37  * Redistribution and use in source and binary forms, with or without
   38  * modification, are permitted provided that the following conditions
   39  * are met:
   40  * 1. Redistributions of source code must retain the above copyright
   41  *    notice, this list of conditions and the following disclaimer.
   42  * 2. Redistributions in binary form must reproduce the above copyright
   43  *    notice, this list of conditions and the following disclaimer in the
   44  *    documentation and/or other materials provided with the distribution.
   45  * 3. All advertising materials mentioning features or use of this software
   46  *    must display the following acknowledgement:
   47  *      This product includes software developed by the University of
   48  *      California, Berkeley and its contributors.
   49  * 4. Neither the name of the University nor the names of its contributors
   50  *    may be used to endorse or promote products derived from this software
   51  *    without specific prior written permission.
   52  *
   53  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   54  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   55  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   56  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   57  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   58  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   59  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   60  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   61  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   62  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   63  * SUCH DAMAGE.
   64  *
   65  *      @(#)ip.h        8.1 (Berkeley) 6/10/93
   66  */
   67 
   68 #ifndef _NETINET_IP6_H_
   69 #define _NETINET_IP6_H_
   70 
   71 /*
   72  * Definition for internet protocol version 6.
   73  * RFC 2460
   74  */
   75 
   76 struct ip6_hdr {
   77         union {
   78                 struct ip6_hdrctl {
   79                         u_int32_t ip6_un1_flow; /* 20 bits of flow-ID */
   80                         u_int16_t ip6_un1_plen; /* payload length */
   81                         u_int8_t  ip6_un1_nxt;  /* next header */
   82                         u_int8_t  ip6_un1_hlim; /* hop limit */
   83                 } ip6_un1;
   84                 u_int8_t ip6_un2_vfc;   /* 4 bits version, top 4 bits class */
   85         } ip6_ctlun;
   86         struct in6_addr ip6_src;        /* source address */
   87         struct in6_addr ip6_dst;        /* destination address */
   88 } __attribute__((__packed__));
   89 
   90 #define ip6_vfc         ip6_ctlun.ip6_un2_vfc
   91 #define ip6_flow        ip6_ctlun.ip6_un1.ip6_un1_flow
   92 #define ip6_plen        ip6_ctlun.ip6_un1.ip6_un1_plen
   93 #define ip6_nxt         ip6_ctlun.ip6_un1.ip6_un1_nxt
   94 #define ip6_hlim        ip6_ctlun.ip6_un1.ip6_un1_hlim
   95 #define ip6_hops        ip6_ctlun.ip6_un1.ip6_un1_hlim
   96 
   97 #define IPV6_VERSION            0x60
   98 #define IPV6_VERSION_MASK       0xf0
   99 
  100 #if BYTE_ORDER == BIG_ENDIAN
  101 #define IPV6_FLOWINFO_MASK      0x0fffffff      /* flow info (28 bits) */
  102 #define IPV6_FLOWLABEL_MASK     0x000fffff      /* flow label (20 bits) */
  103 #else
  104 #if BYTE_ORDER == LITTLE_ENDIAN
  105 #define IPV6_FLOWINFO_MASK      0xffffff0f      /* flow info (28 bits) */
  106 #define IPV6_FLOWLABEL_MASK     0xffff0f00      /* flow label (20 bits) */
  107 #endif /* LITTLE_ENDIAN */
  108 #endif
  109 #if 1
  110 /* ECN bits proposed by Sally Floyd */
  111 #define IP6TOS_CE               0x01    /* congestion experienced */
  112 #define IP6TOS_ECT              0x02    /* ECN-capable transport */
  113 #endif
  114 
  115 /*
  116  * Extension Headers
  117  */
  118 
  119 struct  ip6_ext {
  120         u_int8_t ip6e_nxt;
  121         u_int8_t ip6e_len;
  122 } __attribute__((__packed__));
  123 
  124 /* Hop-by-Hop options header */
  125 /* XXX should we pad it to force alignment on an 8-byte boundary? */
  126 struct ip6_hbh {
  127         u_int8_t ip6h_nxt;      /* next header */
  128         u_int8_t ip6h_len;      /* length in units of 8 octets */
  129         /* followed by options */
  130 } __attribute__((__packed__));
  131 
  132 /* Destination options header */
  133 /* XXX should we pad it to force alignment on an 8-byte boundary? */
  134 struct ip6_dest {
  135         u_int8_t ip6d_nxt;      /* next header */
  136         u_int8_t ip6d_len;      /* length in units of 8 octets */
  137         /* followed by options */
  138 } __attribute__((__packed__));
  139 
  140 /* Option types and related macros */
  141 #define IP6OPT_PAD1             0x00    /* 00 0 00000 */
  142 #define IP6OPT_PADN             0x01    /* 00 0 00001 */
  143 #define IP6OPT_JUMBO            0xC2    /* 11 0 00010 = 194 */
  144 #define IP6OPT_NSAP_ADDR        0xC3    /* 11 0 00011 */
  145 #define IP6OPT_TUNNEL_LIMIT     0x04    /* 00 0 00100 */
  146 #define IP6OPT_RTALERT          0x05    /* 00 0 00101 (KAME definition) */
  147 
  148 #define IP6OPT_RTALERT_LEN      4
  149 #define IP6OPT_RTALERT_MLD      0       /* Datagram contains an MLD message */
  150 #define IP6OPT_RTALERT_RSVP     1       /* Datagram contains an RSVP message */
  151 #define IP6OPT_RTALERT_ACTNET   2       /* contains an Active Networks msg */
  152 #define IP6OPT_MINLEN           2
  153 
  154 #define IP6OPT_BINDING_UPDATE   0xc6    /* 11 0 00110 */
  155 #define IP6OPT_BINDING_ACK      0x07    /* 00 0 00111 */
  156 #define IP6OPT_BINDING_REQ      0x08    /* 00 0 01000 */
  157 #define IP6OPT_HOME_ADDRESS     0xc9    /* 11 0 01001 */
  158 #define IP6OPT_EID              0x8a    /* 10 0 01010 */
  159 
  160 #define IP6OPT_TYPE(o)          ((o) & 0xC0)
  161 #define IP6OPT_TYPE_SKIP        0x00
  162 #define IP6OPT_TYPE_DISCARD     0x40
  163 #define IP6OPT_TYPE_FORCEICMP   0x80
  164 #define IP6OPT_TYPE_ICMP        0xC0
  165 
  166 #define IP6OPT_MUTABLE          0x20
  167 
  168 #define IP6OPT_JUMBO_LEN        6
  169 
  170 /* Routing header */
  171 struct ip6_rthdr {
  172         u_int8_t  ip6r_nxt;     /* next header */
  173         u_int8_t  ip6r_len;     /* length in units of 8 octets */
  174         u_int8_t  ip6r_type;    /* routing type */
  175         u_int8_t  ip6r_segleft; /* segments left */
  176         /* followed by routing type specific data */
  177 } __attribute__((__packed__));
  178 
  179 /* Type 0 Routing header */
  180 struct ip6_rthdr0 {
  181         u_int8_t  ip6r0_nxt;            /* next header */
  182         u_int8_t  ip6r0_len;            /* length in units of 8 octets */
  183         u_int8_t  ip6r0_type;           /* always zero */
  184         u_int8_t  ip6r0_segleft;        /* segments left */
  185         u_int8_t  ip6r0_reserved;       /* reserved field */
  186         u_int8_t  ip6r0_slmap[3];       /* strict/loose bit map */
  187         struct in6_addr  ip6r0_addr[1]; /* up to 23 addresses */
  188 } __attribute__((__packed__));
  189 
  190 /* Fragment header */
  191 struct ip6_frag {
  192         u_int8_t  ip6f_nxt;             /* next header */
  193         u_int8_t  ip6f_reserved;        /* reserved field */
  194         u_int16_t ip6f_offlg;           /* offset, reserved, and flag */
  195         u_int32_t ip6f_ident;           /* identification */
  196 } __attribute__((__packed__));
  197 
  198 #if BYTE_ORDER == BIG_ENDIAN
  199 #define IP6F_OFF_MASK           0xfff8  /* mask out offset from _offlg */
  200 #define IP6F_RESERVED_MASK      0x0006  /* reserved bits in ip6f_offlg */
  201 #define IP6F_MORE_FRAG          0x0001  /* more-fragments flag */
  202 #else /* BYTE_ORDER == LITTLE_ENDIAN */
  203 #define IP6F_OFF_MASK           0xf8ff  /* mask out offset from _offlg */
  204 #define IP6F_RESERVED_MASK      0x0600  /* reserved bits in ip6f_offlg */
  205 #define IP6F_MORE_FRAG          0x0100  /* more-fragments flag */
  206 #endif /* BYTE_ORDER == LITTLE_ENDIAN */
  207 
  208 /*
  209  * Internet implementation parameters.
  210  */
  211 #define IPV6_MAXHLIM    255     /* maximun hoplimit */
  212 #define IPV6_DEFHLIM    64      /* default hlim */
  213 #define IPV6_FRAGTTL    120     /* ttl for fragment packets, in slowtimo tick */
  214 #define IPV6_HLIMDEC    1       /* subtracted when forwaeding */
  215 
  216 #define IPV6_MMTU       1280    /* minimal MTU and reassembly. 1024 + 256 */
  217 #define IPV6_MAXPACKET  65535   /* ip6 max packet size without Jumbo payload*/
  218 
  219 #ifdef _KERNEL
  220 /*
  221  * IP6_EXTHDR_CHECK ensures that region between the IP6 header and the
  222  * target header (including IPv6 itself, extension headers and
  223  * TCP/UDP/ICMP6 headers) are continuous. KAME requires drivers
  224  * to store incoming data into one internal mbuf or one or more external
  225  * mbufs(never into two or more internal mbufs). Thus, the third case is
  226  * supposed to never be matched but is prepared just in case.
  227  */
  228 
  229 #define IP6_EXTHDR_CHECK(m, off, hlen, ret)                             \
  230 do {                                                                    \
  231     if ((m)->m_next != NULL) {                                          \
  232         if (((m)->m_flags & M_LOOP) &&                                  \
  233             ((m)->m_len < (off) + (hlen)) &&                            \
  234             (((m) = m_pullup((m), (off) + (hlen))) == NULL)) {          \
  235                 ip6stat.ip6s_exthdrtoolong++;                           \
  236                 return ret;                                             \
  237         } else if ((m)->m_flags & M_EXT) {                              \
  238                 if ((m)->m_len < (off) + (hlen)) {                      \
  239                         ip6stat.ip6s_exthdrtoolong++;                   \
  240                         m_freem(m);                                     \
  241                         return ret;                                     \
  242                 }                                                       \
  243         } else {                                                        \
  244                 if ((m)->m_len < (off) + (hlen)) {                      \
  245                         ip6stat.ip6s_exthdrtoolong++;                   \
  246                         m_freem(m);                                     \
  247                         return ret;                                     \
  248                 }                                                       \
  249         }                                                               \
  250     } else {                                                            \
  251         if ((m)->m_len < (off) + (hlen)) {                              \
  252                 ip6stat.ip6s_tooshort++;                                \
  253                 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);   \
  254                 m_freem(m);                                             \
  255                 return ret;                                             \
  256         }                                                               \
  257     }                                                                   \
  258 } while (0)
  259 
  260 /*
  261  * IP6_EXTHDR_GET ensures that intermediate protocol header (from "off" to
  262  * "len") is located in single mbuf, on contiguous memory region.
  263  * The pointer to the region will be returned to pointer variable "val",
  264  * with type "typ".
  265  * IP6_EXTHDR_GET0 does the same, except that it aligns the structure at the
  266  * very top of mbuf.  GET0 is likely to make memory copy than GET.
  267  *
  268  * XXX we're now testing this, needs m_pulldown()
  269  */
  270 #define IP6_EXTHDR_GET(val, typ, m, off, len) \
  271 do {                                                                    \
  272         struct mbuf *t;                                                 \
  273         int tmp;                                                        \
  274         if ((m)->m_len >= (off) + (len))                                \
  275                 (val) = (typ)(mtod((m), caddr_t) + (off));              \
  276         else {                                                          \
  277                 t = m_pulldown((m), (off), (len), &tmp);                \
  278                 if (t) {                                                \
  279                         if (t->m_len < tmp + (len))                     \
  280                                 panic("m_pulldown malfunction");        \
  281                         (val) = (typ)(mtod(t, caddr_t) + tmp);          \
  282                 } else {                                                \
  283                         (val) = (typ)NULL;                              \
  284                         (m) = NULL;                                     \
  285                 }                                                       \
  286         }                                                               \
  287 } while (0)
  288 
  289 #define IP6_EXTHDR_GET0(val, typ, m, off, len) \
  290 do {                                                                    \
  291         struct mbuf *t;                                                 \
  292         if ((off) == 0)                                                 \
  293                 (val) = (typ)mtod(m, caddr_t);                          \
  294         else {                                                          \
  295                 t = m_pulldown((m), (off), (len), NULL);                \
  296                 if (t) {                                                \
  297                         if (t->m_len < (len))                           \
  298                                 panic("m_pulldown malfunction");        \
  299                         (val) = (typ)mtod(t, caddr_t);                  \
  300                 } else {                                                \
  301                         (val) = (typ)NULL;                              \
  302                         (m) = NULL;                                     \
  303                 }                                                       \
  304         }                                                               \
  305 } while (0)
  306 #endif /*_KERNEL*/
  307 
  308 #endif /* not _NETINET_IP6_H_ */

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