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: stable/9/sys/netinet/ip6.h 250044 2013-04-29 10:52:45Z ae $   */
    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  * 4. Neither the name of the University nor the names of its contributors
   46  *    may be used to endorse or promote products derived from this software
   47  *    without specific prior written permission.
   48  *
   49  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   50  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   51  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   52  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   53  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   54  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   55  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   56  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   57  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   58  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   59  * SUCH DAMAGE.
   60  *
   61  *      @(#)ip.h        8.1 (Berkeley) 6/10/93
   62  */
   63 
   64 #ifndef _NETINET_IP6_H_
   65 #define _NETINET_IP6_H_
   66 
   67 /*
   68  * Definition for internet protocol version 6.
   69  * RFC 2460
   70  */
   71 
   72 struct ip6_hdr {
   73         union {
   74                 struct ip6_hdrctl {
   75                         u_int32_t ip6_un1_flow; /* 20 bits of flow-ID */
   76                         u_int16_t ip6_un1_plen; /* payload length */
   77                         u_int8_t  ip6_un1_nxt;  /* next header */
   78                         u_int8_t  ip6_un1_hlim; /* hop limit */
   79                 } ip6_un1;
   80                 u_int8_t ip6_un2_vfc;   /* 4 bits version, top 4 bits class */
   81         } ip6_ctlun;
   82         struct in6_addr ip6_src;        /* source address */
   83         struct in6_addr ip6_dst;        /* destination address */
   84 } __packed;
   85 
   86 #define ip6_vfc         ip6_ctlun.ip6_un2_vfc
   87 #define ip6_flow        ip6_ctlun.ip6_un1.ip6_un1_flow
   88 #define ip6_plen        ip6_ctlun.ip6_un1.ip6_un1_plen
   89 #define ip6_nxt         ip6_ctlun.ip6_un1.ip6_un1_nxt
   90 #define ip6_hlim        ip6_ctlun.ip6_un1.ip6_un1_hlim
   91 #define ip6_hops        ip6_ctlun.ip6_un1.ip6_un1_hlim
   92 
   93 #define IPV6_VERSION            0x60
   94 #define IPV6_VERSION_MASK       0xf0
   95 
   96 #if BYTE_ORDER == BIG_ENDIAN
   97 #define IPV6_FLOWINFO_MASK      0x0fffffff      /* flow info (28 bits) */
   98 #define IPV6_FLOWLABEL_MASK     0x000fffff      /* flow label (20 bits) */
   99 #else
  100 #if BYTE_ORDER == LITTLE_ENDIAN
  101 #define IPV6_FLOWINFO_MASK      0xffffff0f      /* flow info (28 bits) */
  102 #define IPV6_FLOWLABEL_MASK     0xffff0f00      /* flow label (20 bits) */
  103 #endif /* LITTLE_ENDIAN */
  104 #endif
  105 #if 1
  106 /* ECN bits proposed by Sally Floyd */
  107 #define IP6TOS_CE               0x01    /* congestion experienced */
  108 #define IP6TOS_ECT              0x02    /* ECN-capable transport */
  109 #endif
  110 
  111 /*
  112  * Extension Headers
  113  */
  114 
  115 struct  ip6_ext {
  116         u_int8_t ip6e_nxt;
  117         u_int8_t ip6e_len;
  118 } __packed;
  119 
  120 /* Hop-by-Hop options header */
  121 /* XXX should we pad it to force alignment on an 8-byte boundary? */
  122 struct ip6_hbh {
  123         u_int8_t ip6h_nxt;      /* next header */
  124         u_int8_t ip6h_len;      /* length in units of 8 octets */
  125         /* followed by options */
  126 } __packed;
  127 
  128 /* Destination options header */
  129 /* XXX should we pad it to force alignment on an 8-byte boundary? */
  130 struct ip6_dest {
  131         u_int8_t ip6d_nxt;      /* next header */
  132         u_int8_t ip6d_len;      /* length in units of 8 octets */
  133         /* followed by options */
  134 } __packed;
  135 
  136 /* Option types and related macros */
  137 #define IP6OPT_PAD1             0x00    /* 00 0 00000 */
  138 #define IP6OPT_PADN             0x01    /* 00 0 00001 */
  139 #define IP6OPT_JUMBO            0xC2    /* 11 0 00010 = 194 */
  140 #define IP6OPT_NSAP_ADDR        0xC3    /* 11 0 00011 */
  141 #define IP6OPT_TUNNEL_LIMIT     0x04    /* 00 0 00100 */
  142 #ifndef _KERNEL
  143 #define IP6OPT_RTALERT          0x05    /* 00 0 00101 (KAME definition) */
  144 #endif
  145 #define IP6OPT_ROUTER_ALERT     0x05    /* 00 0 00101 (RFC3542, recommended) */
  146 
  147 #define IP6OPT_RTALERT_LEN      4
  148 #define IP6OPT_RTALERT_MLD      0       /* Datagram contains an MLD message */
  149 #define IP6OPT_RTALERT_RSVP     1       /* Datagram contains an RSVP message */
  150 #define IP6OPT_RTALERT_ACTNET   2       /* contains an Active Networks msg */
  151 #define IP6OPT_MINLEN           2
  152 
  153 #define IP6OPT_EID              0x8a    /* 10 0 01010 */
  154 
  155 #define IP6OPT_TYPE(o)          ((o) & 0xC0)
  156 #define IP6OPT_TYPE_SKIP        0x00
  157 #define IP6OPT_TYPE_DISCARD     0x40
  158 #define IP6OPT_TYPE_FORCEICMP   0x80
  159 #define IP6OPT_TYPE_ICMP        0xC0
  160 
  161 #define IP6OPT_MUTABLE          0x20
  162 
  163 /* IPv6 options: common part */
  164 struct ip6_opt {
  165         u_int8_t ip6o_type;
  166         u_int8_t ip6o_len;
  167 } __packed;
  168 
  169 /* Jumbo Payload Option */
  170 struct ip6_opt_jumbo {
  171         u_int8_t ip6oj_type;
  172         u_int8_t ip6oj_len;
  173         u_int8_t ip6oj_jumbo_len[4];
  174 } __packed;
  175 #define IP6OPT_JUMBO_LEN        6
  176 
  177 /* NSAP Address Option */
  178 struct ip6_opt_nsap {
  179         u_int8_t ip6on_type;
  180         u_int8_t ip6on_len;
  181         u_int8_t ip6on_src_nsap_len;
  182         u_int8_t ip6on_dst_nsap_len;
  183         /* followed by source NSAP */
  184         /* followed by destination NSAP */
  185 } __packed;
  186 
  187 /* Tunnel Limit Option */
  188 struct ip6_opt_tunnel {
  189         u_int8_t ip6ot_type;
  190         u_int8_t ip6ot_len;
  191         u_int8_t ip6ot_encap_limit;
  192 } __packed;
  193 
  194 /* Router Alert Option */
  195 struct ip6_opt_router {
  196         u_int8_t ip6or_type;
  197         u_int8_t ip6or_len;
  198         u_int8_t ip6or_value[2];
  199 } __packed;
  200 /* Router alert values (in network byte order) */
  201 #if BYTE_ORDER == BIG_ENDIAN
  202 #define IP6_ALERT_MLD   0x0000
  203 #define IP6_ALERT_RSVP  0x0001
  204 #define IP6_ALERT_AN    0x0002
  205 #else
  206 #if BYTE_ORDER == LITTLE_ENDIAN
  207 #define IP6_ALERT_MLD   0x0000
  208 #define IP6_ALERT_RSVP  0x0100
  209 #define IP6_ALERT_AN    0x0200
  210 #endif /* LITTLE_ENDIAN */
  211 #endif
  212 
  213 /* Routing header */
  214 struct ip6_rthdr {
  215         u_int8_t  ip6r_nxt;     /* next header */
  216         u_int8_t  ip6r_len;     /* length in units of 8 octets */
  217         u_int8_t  ip6r_type;    /* routing type */
  218         u_int8_t  ip6r_segleft; /* segments left */
  219         /* followed by routing type specific data */
  220 } __packed;
  221 
  222 /* Type 0 Routing header, deprecated by RFC 5095. */
  223 struct ip6_rthdr0 {
  224         u_int8_t  ip6r0_nxt;            /* next header */
  225         u_int8_t  ip6r0_len;            /* length in units of 8 octets */
  226         u_int8_t  ip6r0_type;           /* always zero */
  227         u_int8_t  ip6r0_segleft;        /* segments left */
  228         u_int32_t  ip6r0_reserved;      /* reserved field */
  229         /* followed by up to 127 struct in6_addr */
  230 } __packed;
  231 
  232 /* Fragment header */
  233 struct ip6_frag {
  234         u_int8_t  ip6f_nxt;             /* next header */
  235         u_int8_t  ip6f_reserved;        /* reserved field */
  236         u_int16_t ip6f_offlg;           /* offset, reserved, and flag */
  237         u_int32_t ip6f_ident;           /* identification */
  238 } __packed;
  239 
  240 #if BYTE_ORDER == BIG_ENDIAN
  241 #define IP6F_OFF_MASK           0xfff8  /* mask out offset from _offlg */
  242 #define IP6F_RESERVED_MASK      0x0006  /* reserved bits in ip6f_offlg */
  243 #define IP6F_MORE_FRAG          0x0001  /* more-fragments flag */
  244 #else /* BYTE_ORDER == LITTLE_ENDIAN */
  245 #define IP6F_OFF_MASK           0xf8ff  /* mask out offset from _offlg */
  246 #define IP6F_RESERVED_MASK      0x0600  /* reserved bits in ip6f_offlg */
  247 #define IP6F_MORE_FRAG          0x0100  /* more-fragments flag */
  248 #endif /* BYTE_ORDER == LITTLE_ENDIAN */
  249 
  250 /*
  251  * Internet implementation parameters.
  252  */
  253 #define IPV6_MAXHLIM    255     /* maximum hoplimit */
  254 #define IPV6_DEFHLIM    64      /* default hlim */
  255 #define IPV6_FRAGTTL    120     /* ttl for fragment packets, in slowtimo tick */
  256 #define IPV6_HLIMDEC    1       /* subtracted when forwarding */
  257 
  258 #define IPV6_MMTU       1280    /* minimal MTU and reassembly. 1024 + 256 */
  259 #define IPV6_MAXPACKET  65535   /* ip6 max packet size without Jumbo payload*/
  260 #define IPV6_MAXOPTHDR  2048    /* max option header size, 256 64-bit words */
  261 
  262 #ifdef _KERNEL
  263 /*
  264  * IP6_EXTHDR_CHECK ensures that region between the IP6 header and the
  265  * target header (including IPv6 itself, extension headers and
  266  * TCP/UDP/ICMP6 headers) are contiguous. KAME requires drivers
  267  * to store incoming data into one internal mbuf or one or more external
  268  * mbufs(never into two or more internal mbufs). Thus, the third case is
  269  * supposed to never be matched but is prepared just in case.
  270  */
  271 
  272 #define IP6_EXTHDR_CHECK(m, off, hlen, ret)                             \
  273 do {                                                                    \
  274     if ((m)->m_next != NULL) {                                          \
  275         if (((m)->m_flags & M_LOOP) &&                                  \
  276             ((m)->m_len < (off) + (hlen)) &&                            \
  277             (((m) = m_pullup((m), (off) + (hlen))) == NULL)) {          \
  278                 IP6STAT_INC(ip6s_exthdrtoolong);                                \
  279                 return ret;                                             \
  280         } else if ((m)->m_flags & M_EXT) {                              \
  281                 if ((m)->m_len < (off) + (hlen)) {                      \
  282                         IP6STAT_INC(ip6s_exthdrtoolong);                        \
  283                         m_freem(m);                                     \
  284                         return ret;                                     \
  285                 }                                                       \
  286         } else {                                                        \
  287                 if ((m)->m_len < (off) + (hlen)) {                      \
  288                         IP6STAT_INC(ip6s_exthdrtoolong);                        \
  289                         m_freem(m);                                     \
  290                         return ret;                                     \
  291                 }                                                       \
  292         }                                                               \
  293     } else {                                                            \
  294         if ((m)->m_len < (off) + (hlen)) {                              \
  295                 IP6STAT_INC(ip6s_tooshort);                             \
  296                 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);   \
  297                 m_freem(m);                                             \
  298                 return ret;                                             \
  299         }                                                               \
  300     }                                                                   \
  301 } while (/*CONSTCOND*/ 0)
  302 
  303 /*
  304  * IP6_EXTHDR_GET ensures that intermediate protocol header (from "off" to
  305  * "len") is located in single mbuf, on contiguous memory region.
  306  * The pointer to the region will be returned to pointer variable "val",
  307  * with type "typ".
  308  * IP6_EXTHDR_GET0 does the same, except that it aligns the structure at the
  309  * very top of mbuf.  GET0 is likely to make memory copy than GET.
  310  *
  311  * XXX we're now testing this, needs m_pulldown()
  312  */
  313 #define IP6_EXTHDR_GET(val, typ, m, off, len) \
  314 do {                                                                    \
  315         struct mbuf *t;                                                 \
  316         int tmp;                                                        \
  317         if ((m)->m_len >= (off) + (len))                                \
  318                 (val) = (typ)(mtod((m), caddr_t) + (off));              \
  319         else {                                                          \
  320                 t = m_pulldown((m), (off), (len), &tmp);                \
  321                 if (t) {                                                \
  322                         if (t->m_len < tmp + (len))                     \
  323                                 panic("m_pulldown malfunction");        \
  324                         (val) = (typ)(mtod(t, caddr_t) + tmp);          \
  325                 } else {                                                \
  326                         (val) = (typ)NULL;                              \
  327                         (m) = NULL;                                     \
  328                 }                                                       \
  329         }                                                               \
  330 } while (/*CONSTCOND*/ 0)
  331 
  332 #define IP6_EXTHDR_GET0(val, typ, m, off, len) \
  333 do {                                                                    \
  334         struct mbuf *t;                                                 \
  335         if ((off) == 0)                                                 \
  336                 (val) = (typ)mtod(m, caddr_t);                          \
  337         else {                                                          \
  338                 t = m_pulldown((m), (off), (len), NULL);                \
  339                 if (t) {                                                \
  340                         if (t->m_len < (len))                           \
  341                                 panic("m_pulldown malfunction");        \
  342                         (val) = (typ)mtod(t, caddr_t);                  \
  343                 } else {                                                \
  344                         (val) = (typ)NULL;                              \
  345                         (m) = NULL;                                     \
  346                 }                                                       \
  347         }                                                               \
  348 } while (/*CONSTCOND*/ 0)
  349 
  350 #endif /*_KERNEL*/
  351 
  352 #endif /* not _NETINET_IP6_H_ */

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