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: releng/12.0/sys/netinet/ip6.h 335837 2018-07-01 08:37:07Z kp $        */
    2 /*      $KAME: ip6.h,v 1.18 2001/03/29 05:34:30 itojun Exp $    */
    3 
    4 /*-
    5  * SPDX-License-Identifier: BSD-3-Clause
    6  *
    7  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    8  * All rights reserved.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. Neither the name of the project nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  */
   34 
   35 /*-
   36  * Copyright (c) 1982, 1986, 1993
   37  *      The Regents of the University of California.  All rights reserved.
   38  *
   39  * Redistribution and use in source and binary forms, with or without
   40  * modification, are permitted provided that the following conditions
   41  * are met:
   42  * 1. Redistributions of source code must retain the above copyright
   43  *    notice, this list of conditions and the following disclaimer.
   44  * 2. Redistributions in binary form must reproduce the above copyright
   45  *    notice, this list of conditions and the following disclaimer in the
   46  *    documentation and/or other materials provided with the distribution.
   47  * 3. Neither the name of the University nor the names of its contributors
   48  *    may be used to endorse or promote products derived from this software
   49  *    without specific prior written permission.
   50  *
   51  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   52  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   53  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   54  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   55  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   56  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   57  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   58  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   59  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   60  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   61  * SUCH DAMAGE.
   62  *
   63  *      @(#)ip.h        8.1 (Berkeley) 6/10/93
   64  */
   65 
   66 #ifndef _NETINET_IP6_H_
   67 #define _NETINET_IP6_H_
   68 
   69 /*
   70  * Definition for internet protocol version 6.
   71  * RFC 2460
   72  */
   73 
   74 struct ip6_hdr {
   75         union {
   76                 struct ip6_hdrctl {
   77                         u_int32_t ip6_un1_flow; /* 20 bits of flow-ID */
   78                         u_int16_t ip6_un1_plen; /* payload length */
   79                         u_int8_t  ip6_un1_nxt;  /* next header */
   80                         u_int8_t  ip6_un1_hlim; /* hop limit */
   81                 } ip6_un1;
   82                 u_int8_t ip6_un2_vfc;   /* 4 bits version, top 4 bits class */
   83         } ip6_ctlun;
   84         struct in6_addr ip6_src;        /* source address */
   85         struct in6_addr ip6_dst;        /* destination address */
   86 } __packed;
   87 
   88 #define ip6_vfc         ip6_ctlun.ip6_un2_vfc
   89 #define ip6_flow        ip6_ctlun.ip6_un1.ip6_un1_flow
   90 #define ip6_plen        ip6_ctlun.ip6_un1.ip6_un1_plen
   91 #define ip6_nxt         ip6_ctlun.ip6_un1.ip6_un1_nxt
   92 #define ip6_hlim        ip6_ctlun.ip6_un1.ip6_un1_hlim
   93 #define ip6_hops        ip6_ctlun.ip6_un1.ip6_un1_hlim
   94 
   95 #define IPV6_VERSION            0x60
   96 #define IPV6_VERSION_MASK       0xf0
   97 
   98 #if BYTE_ORDER == BIG_ENDIAN
   99 #define IPV6_FLOWINFO_MASK      0x0fffffff      /* flow info (28 bits) */
  100 #define IPV6_FLOWLABEL_MASK     0x000fffff      /* flow label (20 bits) */
  101 #else
  102 #if BYTE_ORDER == LITTLE_ENDIAN
  103 #define IPV6_FLOWINFO_MASK      0xffffff0f      /* flow info (28 bits) */
  104 #define IPV6_FLOWLABEL_MASK     0xffff0f00      /* flow label (20 bits) */
  105 #endif /* LITTLE_ENDIAN */
  106 #endif
  107 #define IPV6_FLOWLABEL_LEN      20
  108 #if 1
  109 /* ECN bits proposed by Sally Floyd */
  110 #define IP6TOS_CE               0x01    /* congestion experienced */
  111 #define IP6TOS_ECT              0x02    /* ECN-capable transport */
  112 #endif
  113 
  114 /*
  115  * Extension Headers
  116  */
  117 
  118 struct  ip6_ext {
  119         u_int8_t ip6e_nxt;
  120         u_int8_t ip6e_len;
  121 } __packed;
  122 
  123 /* Hop-by-Hop options header */
  124 /* XXX should we pad it to force alignment on an 8-byte boundary? */
  125 struct ip6_hbh {
  126         u_int8_t ip6h_nxt;      /* next header */
  127         u_int8_t ip6h_len;      /* length in units of 8 octets */
  128         /* followed by options */
  129 } __packed;
  130 
  131 /* Destination options header */
  132 /* XXX should we pad it to force alignment on an 8-byte boundary? */
  133 struct ip6_dest {
  134         u_int8_t ip6d_nxt;      /* next header */
  135         u_int8_t ip6d_len;      /* length in units of 8 octets */
  136         /* followed by options */
  137 } __packed;
  138 
  139 /* Option types and related macros */
  140 #define IP6OPT_PAD1             0x00    /* 00 0 00000 */
  141 #define IP6OPT_PADN             0x01    /* 00 0 00001 */
  142 #define IP6OPT_JUMBO            0xC2    /* 11 0 00010 = 194 */
  143 #define IP6OPT_NSAP_ADDR        0xC3    /* 11 0 00011 */
  144 #define IP6OPT_TUNNEL_LIMIT     0x04    /* 00 0 00100 */
  145 #ifndef _KERNEL
  146 #define IP6OPT_RTALERT          0x05    /* 00 0 00101 (KAME definition) */
  147 #endif
  148 #define IP6OPT_ROUTER_ALERT     0x05    /* 00 0 00101 (RFC3542, recommended) */
  149 
  150 #define IP6OPT_RTALERT_LEN      4
  151 #define IP6OPT_RTALERT_MLD      0       /* Datagram contains an MLD message */
  152 #define IP6OPT_RTALERT_RSVP     1       /* Datagram contains an RSVP message */
  153 #define IP6OPT_RTALERT_ACTNET   2       /* contains an Active Networks msg */
  154 #define IP6OPT_MINLEN           2
  155 
  156 #define IP6OPT_EID              0x8a    /* 10 0 01010 */
  157 
  158 #define IP6OPT_TYPE(o)          ((o) & 0xC0)
  159 #define IP6OPT_TYPE_SKIP        0x00
  160 #define IP6OPT_TYPE_DISCARD     0x40
  161 #define IP6OPT_TYPE_FORCEICMP   0x80
  162 #define IP6OPT_TYPE_ICMP        0xC0
  163 
  164 #define IP6OPT_MUTABLE          0x20
  165 
  166 /* IPv6 options: common part */
  167 struct ip6_opt {
  168         u_int8_t ip6o_type;
  169         u_int8_t ip6o_len;
  170 } __packed;
  171 
  172 /* Jumbo Payload Option */
  173 struct ip6_opt_jumbo {
  174         u_int8_t ip6oj_type;
  175         u_int8_t ip6oj_len;
  176         u_int8_t ip6oj_jumbo_len[4];
  177 } __packed;
  178 #define IP6OPT_JUMBO_LEN        6
  179 
  180 /* NSAP Address Option */
  181 struct ip6_opt_nsap {
  182         u_int8_t ip6on_type;
  183         u_int8_t ip6on_len;
  184         u_int8_t ip6on_src_nsap_len;
  185         u_int8_t ip6on_dst_nsap_len;
  186         /* followed by source NSAP */
  187         /* followed by destination NSAP */
  188 } __packed;
  189 
  190 /* Tunnel Limit Option */
  191 struct ip6_opt_tunnel {
  192         u_int8_t ip6ot_type;
  193         u_int8_t ip6ot_len;
  194         u_int8_t ip6ot_encap_limit;
  195 } __packed;
  196 
  197 /* Router Alert Option */
  198 struct ip6_opt_router {
  199         u_int8_t ip6or_type;
  200         u_int8_t ip6or_len;
  201         u_int8_t ip6or_value[2];
  202 } __packed;
  203 /* Router alert values (in network byte order) */
  204 #if BYTE_ORDER == BIG_ENDIAN
  205 #define IP6_ALERT_MLD   0x0000
  206 #define IP6_ALERT_RSVP  0x0001
  207 #define IP6_ALERT_AN    0x0002
  208 #else
  209 #if BYTE_ORDER == LITTLE_ENDIAN
  210 #define IP6_ALERT_MLD   0x0000
  211 #define IP6_ALERT_RSVP  0x0100
  212 #define IP6_ALERT_AN    0x0200
  213 #endif /* LITTLE_ENDIAN */
  214 #endif
  215 
  216 /* Routing header */
  217 struct ip6_rthdr {
  218         u_int8_t  ip6r_nxt;     /* next header */
  219         u_int8_t  ip6r_len;     /* length in units of 8 octets */
  220         u_int8_t  ip6r_type;    /* routing type */
  221         u_int8_t  ip6r_segleft; /* segments left */
  222         /* followed by routing type specific data */
  223 } __packed;
  224 
  225 /* Type 0 Routing header, deprecated by RFC 5095. */
  226 struct ip6_rthdr0 {
  227         u_int8_t  ip6r0_nxt;            /* next header */
  228         u_int8_t  ip6r0_len;            /* length in units of 8 octets */
  229         u_int8_t  ip6r0_type;           /* always zero */
  230         u_int8_t  ip6r0_segleft;        /* segments left */
  231         u_int32_t  ip6r0_reserved;      /* reserved field */
  232         /* followed by up to 127 struct in6_addr */
  233 } __packed;
  234 
  235 /* Fragment header */
  236 struct ip6_frag {
  237         u_int8_t  ip6f_nxt;             /* next header */
  238         u_int8_t  ip6f_reserved;        /* reserved field */
  239         u_int16_t ip6f_offlg;           /* offset, reserved, and flag */
  240         u_int32_t ip6f_ident;           /* identification */
  241 } __packed;
  242 
  243 #if BYTE_ORDER == BIG_ENDIAN
  244 #define IP6F_OFF_MASK           0xfff8  /* mask out offset from _offlg */
  245 #define IP6F_RESERVED_MASK      0x0006  /* reserved bits in ip6f_offlg */
  246 #define IP6F_MORE_FRAG          0x0001  /* more-fragments flag */
  247 #else /* BYTE_ORDER == LITTLE_ENDIAN */
  248 #define IP6F_OFF_MASK           0xf8ff  /* mask out offset from _offlg */
  249 #define IP6F_RESERVED_MASK      0x0600  /* reserved bits in ip6f_offlg */
  250 #define IP6F_MORE_FRAG          0x0100  /* more-fragments flag */
  251 #endif /* BYTE_ORDER == LITTLE_ENDIAN */
  252 
  253 /*
  254  * Internet implementation parameters.
  255  */
  256 #define IPV6_MAXHLIM    255     /* maximum hoplimit */
  257 #define IPV6_DEFHLIM    64      /* default hlim */
  258 #define IPV6_FRAGTTL    120     /* ttl for fragment packets, in slowtimo tick */
  259 #define IPV6_HLIMDEC    1       /* subtracted when forwarding */
  260 
  261 #define IPV6_MMTU       1280    /* minimal MTU and reassembly. 1024 + 256 */
  262 #define IPV6_MAXPACKET  65535   /* ip6 max packet size without Jumbo payload*/
  263 #define IPV6_MAXOPTHDR  2048    /* max option header size, 256 64-bit words */
  264 
  265 #ifdef _KERNEL
  266 /*
  267  * IP6_EXTHDR_CHECK ensures that region between the IP6 header and the
  268  * target header (including IPv6 itself, extension headers and
  269  * TCP/UDP/ICMP6 headers) are contiguous. KAME requires drivers
  270  * to store incoming data into one internal mbuf or one or more external
  271  * mbufs(never into two or more internal mbufs). Thus, the third case is
  272  * supposed to never be matched but is prepared just in case.
  273  */
  274 
  275 #define IP6_EXTHDR_CHECK(m, off, hlen, ret)                             \
  276 do {                                                                    \
  277     if ((m)->m_next != NULL) {                                          \
  278         if (((m)->m_flags & M_LOOP) &&                                  \
  279             ((m)->m_len < (off) + (hlen)) &&                            \
  280             (((m) = m_pullup((m), (off) + (hlen))) == NULL)) {          \
  281                 IP6STAT_INC(ip6s_exthdrtoolong);                                \
  282                 return ret;                                             \
  283         } else {                                                        \
  284                 if ((m)->m_len < (off) + (hlen)) {                      \
  285                         IP6STAT_INC(ip6s_exthdrtoolong);                        \
  286                         m_freem(m);                                     \
  287                         return ret;                                     \
  288                 }                                                       \
  289         }                                                               \
  290     } else {                                                            \
  291         if ((m)->m_len < (off) + (hlen)) {                              \
  292                 IP6STAT_INC(ip6s_tooshort);                             \
  293                 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);   \
  294                 m_freem(m);                                             \
  295                 return ret;                                             \
  296         }                                                               \
  297     }                                                                   \
  298 } while (/*CONSTCOND*/ 0)
  299 
  300 /*
  301  * IP6_EXTHDR_GET ensures that intermediate protocol header (from "off" to
  302  * "len") is located in single mbuf, on contiguous memory region.
  303  * The pointer to the region will be returned to pointer variable "val",
  304  * with type "typ".
  305  * IP6_EXTHDR_GET0 does the same, except that it aligns the structure at the
  306  * very top of mbuf.  GET0 is likely to make memory copy than GET.
  307  *
  308  * XXX we're now testing this, needs m_pulldown()
  309  */
  310 #define IP6_EXTHDR_GET(val, typ, m, off, len) \
  311 do {                                                                    \
  312         struct mbuf *t;                                                 \
  313         int tmp;                                                        \
  314         if ((m)->m_len >= (off) + (len))                                \
  315                 (val) = (typ)(mtod((m), caddr_t) + (off));              \
  316         else {                                                          \
  317                 t = m_pulldown((m), (off), (len), &tmp);                \
  318                 if (t) {                                                \
  319                         if (t->m_len < tmp + (len))                     \
  320                                 panic("m_pulldown malfunction");        \
  321                         (val) = (typ)(mtod(t, caddr_t) + tmp);          \
  322                 } else {                                                \
  323                         (val) = (typ)NULL;                              \
  324                         (m) = NULL;                                     \
  325                 }                                                       \
  326         }                                                               \
  327 } while (/*CONSTCOND*/ 0)
  328 
  329 #define IP6_EXTHDR_GET0(val, typ, m, off, len) \
  330 do {                                                                    \
  331         struct mbuf *t;                                                 \
  332         if ((off) == 0)                                                 \
  333                 (val) = (typ)mtod(m, caddr_t);                          \
  334         else {                                                          \
  335                 t = m_pulldown((m), (off), (len), NULL);                \
  336                 if (t) {                                                \
  337                         if (t->m_len < (len))                           \
  338                                 panic("m_pulldown malfunction");        \
  339                         (val) = (typ)mtod(t, caddr_t);                  \
  340                 } else {                                                \
  341                         (val) = (typ)NULL;                              \
  342                         (m) = NULL;                                     \
  343                 }                                                       \
  344         }                                                               \
  345 } while (/*CONSTCOND*/ 0)
  346 
  347 #endif /*_KERNEL*/
  348 
  349 #endif /* not _NETINET_IP6_H_ */

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