The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/ip6_var.h

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    1 /*      $FreeBSD: releng/6.2/sys/netinet6/ip6_var.h 153715 2005-12-25 14:03:38Z suz $   */
    2 /*      $KAME: ip6_var.h,v 1.62 2001/05/03 14:51:48 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_var.h    8.1 (Berkeley) 6/10/93
   62  */
   63 
   64 #ifndef _NETINET6_IP6_VAR_H_
   65 #define _NETINET6_IP6_VAR_H_
   66 
   67 /*
   68  * IP6 reassembly queue structure.  Each fragment
   69  * being reassembled is attached to one of these structures.
   70  */
   71 struct  ip6q {
   72         u_int32_t       ip6q_head;
   73         u_int16_t       ip6q_len;
   74         u_int8_t        ip6q_nxt;       /* ip6f_nxt in first fragment */
   75         u_int8_t        ip6q_hlim;
   76         struct ip6asfrag *ip6q_down;
   77         struct ip6asfrag *ip6q_up;
   78         u_int32_t       ip6q_ident;
   79         u_int8_t        ip6q_arrive;
   80         u_int8_t        ip6q_ttl;
   81         struct in6_addr ip6q_src, ip6q_dst;
   82         struct ip6q     *ip6q_next;
   83         struct ip6q     *ip6q_prev;
   84         int             ip6q_unfrglen;  /* len of unfragmentable part */
   85 #ifdef notyet
   86         u_char          *ip6q_nxtp;
   87 #endif
   88         int             ip6q_nfrag;     /* # of fragments */
   89 };
   90 
   91 struct  ip6asfrag {
   92         u_int32_t       ip6af_head;
   93         u_int16_t       ip6af_len;
   94         u_int8_t        ip6af_nxt;
   95         u_int8_t        ip6af_hlim;
   96         /* must not override the above members during reassembling */
   97         struct ip6asfrag *ip6af_down;
   98         struct ip6asfrag *ip6af_up;
   99         struct mbuf     *ip6af_m;
  100         int             ip6af_offset;   /* offset in ip6af_m to next header */
  101         int             ip6af_frglen;   /* fragmentable part length */
  102         int             ip6af_off;      /* fragment offset */
  103         u_int16_t       ip6af_mff;      /* more fragment bit in frag off */
  104 };
  105 
  106 #define IP6_REASS_MBUF(ip6af) (*(struct mbuf **)&((ip6af)->ip6af_m))
  107 
  108 struct  ip6_moptions {
  109         struct  ifnet *im6o_multicast_ifp; /* ifp for outgoing multicasts */
  110         u_char  im6o_multicast_hlim;    /* hoplimit for outgoing multicasts */
  111         u_char  im6o_multicast_loop;    /* 1 >= hear sends if a member */
  112         LIST_HEAD(, in6_multi_mship) im6o_memberships;
  113 };
  114 
  115 /*
  116  * Control options for outgoing packets
  117  */
  118 
  119 /* Routing header related info */
  120 struct  ip6po_rhinfo {
  121         struct  ip6_rthdr *ip6po_rhi_rthdr; /* Routing header */
  122         struct  route_in6 ip6po_rhi_route; /* Route to the 1st hop */
  123 };
  124 #define ip6po_rthdr     ip6po_rhinfo.ip6po_rhi_rthdr
  125 #define ip6po_route     ip6po_rhinfo.ip6po_rhi_route
  126 
  127 /* Nexthop related info */
  128 struct  ip6po_nhinfo {
  129         struct  sockaddr *ip6po_nhi_nexthop;
  130         struct  route_in6 ip6po_nhi_route; /* Route to the nexthop */
  131 };
  132 #define ip6po_nexthop   ip6po_nhinfo.ip6po_nhi_nexthop
  133 #define ip6po_nextroute ip6po_nhinfo.ip6po_nhi_route
  134 
  135 struct  ip6_pktopts {
  136         struct  mbuf *ip6po_m;  /* Pointer to mbuf storing the data */
  137         int     ip6po_hlim;     /* Hoplimit for outgoing packets */
  138 
  139         /* Outgoing IF/address information */
  140         struct  in6_pktinfo *ip6po_pktinfo;
  141 
  142         /* Next-hop address information */
  143         struct  ip6po_nhinfo ip6po_nhinfo;
  144 
  145         struct  ip6_hbh *ip6po_hbh; /* Hop-by-Hop options header */
  146 
  147         /* Destination options header (before a routing header) */
  148         struct  ip6_dest *ip6po_dest1;
  149 
  150         /* Routing header related info. */
  151         struct  ip6po_rhinfo ip6po_rhinfo;
  152 
  153         /* Destination options header (after a routing header) */
  154         struct  ip6_dest *ip6po_dest2;
  155 
  156         int     ip6po_tclass;   /* traffic class */
  157 
  158         int     ip6po_minmtu;  /* fragment vs PMTU discovery policy */
  159 #define IP6PO_MINMTU_MCASTONLY  -1 /* default; send at min MTU for multicast*/
  160 #define IP6PO_MINMTU_DISABLE     0 /* always perform pmtu disc */
  161 #define IP6PO_MINMTU_ALL         1 /* always send at min MTU */
  162 
  163         int     ip6po_prefer_tempaddr;  /* whether temporary addresses are
  164                                            preferred as source address */
  165 #define IP6PO_TEMPADDR_SYSTEM   -1 /* follow the system default */
  166 #define IP6PO_TEMPADDR_NOTPREFER 0 /* not prefer temporary address */
  167 #define IP6PO_TEMPADDR_PREFER    1 /* prefer temporary address */
  168 
  169         int ip6po_flags;
  170 #if 0   /* parameters in this block is obsolete. do not reuse the values. */
  171 #define IP6PO_REACHCONF 0x01    /* upper-layer reachability confirmation. */
  172 #define IP6PO_MINMTU    0x02    /* use minimum MTU (IPV6_USE_MIN_MTU) */
  173 #endif
  174 #define IP6PO_DONTFRAG  0x04    /* disable fragmentation (IPV6_DONTFRAG) */
  175 #define IP6PO_USECOA    0x08    /* use care of address */
  176 };
  177 
  178 /*
  179  * Control options for incoming packets
  180  */
  181 
  182 struct  ip6stat {
  183         u_quad_t ip6s_total;            /* total packets received */
  184         u_quad_t ip6s_tooshort;         /* packet too short */
  185         u_quad_t ip6s_toosmall;         /* not enough data */
  186         u_quad_t ip6s_fragments;        /* fragments received */
  187         u_quad_t ip6s_fragdropped;      /* frags dropped(dups, out of space) */
  188         u_quad_t ip6s_fragtimeout;      /* fragments timed out */
  189         u_quad_t ip6s_fragoverflow;     /* fragments that exceeded limit */
  190         u_quad_t ip6s_forward;          /* packets forwarded */
  191         u_quad_t ip6s_cantforward;      /* packets rcvd for unreachable dest */
  192         u_quad_t ip6s_redirectsent;     /* packets forwarded on same net */
  193         u_quad_t ip6s_delivered;        /* datagrams delivered to upper level*/
  194         u_quad_t ip6s_localout;         /* total ip packets generated here */
  195         u_quad_t ip6s_odropped;         /* lost packets due to nobufs, etc. */
  196         u_quad_t ip6s_reassembled;      /* total packets reassembled ok */
  197         u_quad_t ip6s_fragmented;       /* datagrams successfully fragmented */
  198         u_quad_t ip6s_ofragments;       /* output fragments created */
  199         u_quad_t ip6s_cantfrag;         /* don't fragment flag was set, etc. */
  200         u_quad_t ip6s_badoptions;       /* error in option processing */
  201         u_quad_t ip6s_noroute;          /* packets discarded due to no route */
  202         u_quad_t ip6s_badvers;          /* ip6 version != 6 */
  203         u_quad_t ip6s_rawout;           /* total raw ip packets generated */
  204         u_quad_t ip6s_badscope;         /* scope error */
  205         u_quad_t ip6s_notmember;        /* don't join this multicast group */
  206         u_quad_t ip6s_nxthist[256];     /* next header history */
  207         u_quad_t ip6s_m1;               /* one mbuf */
  208         u_quad_t ip6s_m2m[32];          /* two or more mbuf */
  209         u_quad_t ip6s_mext1;            /* one ext mbuf */
  210         u_quad_t ip6s_mext2m;           /* two or more ext mbuf */
  211         u_quad_t ip6s_exthdrtoolong;    /* ext hdr are not continuous */
  212         u_quad_t ip6s_nogif;            /* no match gif found */
  213         u_quad_t ip6s_toomanyhdr;       /* discarded due to too many headers */
  214 
  215         /*
  216          * statistics for improvement of the source address selection
  217          * algorithm:
  218          * XXX: hardcoded 16 = # of ip6 multicast scope types + 1
  219          */
  220         /* number of times that address selection fails */
  221         u_quad_t ip6s_sources_none;
  222         /* number of times that an address on the outgoing I/F is chosen */
  223         u_quad_t ip6s_sources_sameif[16];
  224         /* number of times that an address on a non-outgoing I/F is chosen */
  225         u_quad_t ip6s_sources_otherif[16];
  226         /*
  227          * number of times that an address that has the same scope
  228          * from the destination is chosen.
  229          */
  230         u_quad_t ip6s_sources_samescope[16];
  231         /*
  232          * number of times that an address that has a different scope
  233          * from the destination is chosen.
  234          */
  235         u_quad_t ip6s_sources_otherscope[16];
  236         /* number of times that a deprecated address is chosen */
  237         u_quad_t ip6s_sources_deprecated[16];
  238 
  239         u_quad_t ip6s_forward_cachehit;
  240         u_quad_t ip6s_forward_cachemiss;
  241 
  242         /* number of times that each rule of source selection is applied. */
  243         u_quad_t ip6s_sources_rule[16];
  244 };
  245 
  246 #ifdef _KERNEL
  247 /*
  248  * IPv6 onion peeling state.
  249  * it will be initialized when we come into ip6_input().
  250  * XXX do not make it a kitchen sink!
  251  */
  252 struct ip6aux {
  253         u_int32_t ip6a_flags;
  254 #define IP6A_SWAP       0x01            /* swapped home/care-of on packet */
  255 #define IP6A_HASEEN     0x02            /* HA was present */
  256 #define IP6A_BRUID      0x04            /* BR Unique Identifier was present */
  257 #define IP6A_RTALERTSEEN 0x08           /* rtalert present */
  258 
  259         /* ip6.ip6_src */
  260         struct in6_addr ip6a_careof;    /* care-of address of the peer */
  261         struct in6_addr ip6a_home;      /* home address of the peer */
  262         u_int16_t       ip6a_bruid;     /* BR unique identifier */
  263 
  264         /* ip6.ip6_dst */
  265         struct in6_ifaddr *ip6a_dstia6; /* my ifaddr that matches ip6_dst */
  266 
  267         /* rtalert */
  268         u_int16_t ip6a_rtalert;         /* rtalert option value */
  269 
  270         /*
  271          * decapsulation history will be here.
  272          * with IPsec it may not be accurate.
  273          */
  274 };
  275 #endif
  276 
  277 #ifdef _KERNEL
  278 /* flags passed to ip6_output as last parameter */
  279 #define IPV6_UNSPECSRC          0x01    /* allow :: as the source address */
  280 #define IPV6_FORWARDING         0x02    /* most of IPv6 header exists */
  281 #define IPV6_MINMTU             0x04    /* use minimum MTU (IPV6_USE_MIN_MTU) */
  282 
  283 #ifdef __NO_STRICT_ALIGNMENT
  284 #define IP6_HDR_ALIGNED_P(ip)   1
  285 #else
  286 #define IP6_HDR_ALIGNED_P(ip)   ((((intptr_t) (ip)) & 3) == 0)
  287 #endif
  288 
  289 extern struct   ip6stat ip6stat;        /* statistics */
  290 extern int      ip6_defhlim;            /* default hop limit */
  291 extern int      ip6_defmcasthlim;       /* default multicast hop limit */
  292 extern int      ip6_forwarding;         /* act as router? */
  293 extern int      ip6_forward_srcrt;      /* forward src-routed? */
  294 extern int      ip6_gif_hlim;           /* Hop limit for gif encap packet */
  295 extern int      ip6_use_deprecated;     /* allow deprecated addr as source */
  296 extern int      ip6_rr_prune;           /* router renumbering prefix
  297                                          * walk list every 5 sec.    */
  298 extern int      ip6_mcast_pmtu;         /* enable pMTU discovery for multicast? */
  299 extern int      ip6_v6only;
  300 
  301 extern struct socket *ip6_mrouter;      /* multicast routing daemon */
  302 extern int      ip6_sendredirects;      /* send IP redirects when forwarding? */
  303 extern int      ip6_maxfragpackets; /* Maximum packets in reassembly queue */
  304 extern int      ip6_maxfrags;   /* Maximum fragments in reassembly queue */
  305 extern int      ip6_sourcecheck;        /* Verify source interface */
  306 extern int      ip6_sourcecheck_interval; /* Interval between log messages */
  307 extern int      ip6_accept_rtadv;       /* Acts as a host not a router */
  308 extern int      ip6_keepfaith;          /* Firewall Aided Internet Translator */
  309 extern int      ip6_log_interval;
  310 extern time_t   ip6_log_time;
  311 extern int      ip6_hdrnestlimit; /* upper limit of # of extension headers */
  312 extern int      ip6_dad_count;          /* DupAddrDetectionTransmits */
  313 
  314 extern int ip6_auto_flowlabel;
  315 extern int ip6_auto_linklocal;
  316 
  317 extern int   ip6_anonportmin;           /* minimum ephemeral port */
  318 extern int   ip6_anonportmax;           /* maximum ephemeral port */
  319 extern int   ip6_lowportmin;            /* minimum reserved port */
  320 extern int   ip6_lowportmax;            /* maximum reserved port */
  321 
  322 extern int      ip6_use_tempaddr; /* whether to use temporary addresses. */
  323 extern int      ip6_prefer_tempaddr; /* whether to prefer temporary addresses
  324                                         in the source address selection */
  325 
  326 extern int      ip6_use_defzone; /* whether to use the default scope zone
  327                                     when unspecified */
  328 
  329 extern  struct pfil_head inet6_pfil_hook;       /* packet filter hooks */
  330 #ifdef IPSTEALTH
  331 extern int      ip6stealth;
  332 #endif
  333 
  334 extern struct   pr_usrreqs rip6_usrreqs;
  335 struct sockopt;
  336 
  337 struct inpcb;
  338 
  339 int     icmp6_ctloutput __P((struct socket *, struct sockopt *sopt));
  340 
  341 struct in6_ifaddr;
  342 void    ip6_init __P((void));
  343 void    ip6_input __P((struct mbuf *));
  344 struct in6_ifaddr *ip6_getdstifaddr __P((struct mbuf *));
  345 void    ip6_freepcbopts __P((struct ip6_pktopts *));
  346 void    ip6_freemoptions __P((struct ip6_moptions *));
  347 int     ip6_unknown_opt __P((u_int8_t *, struct mbuf *, int));
  348 char *  ip6_get_prevhdr __P((struct mbuf *, int));
  349 int     ip6_nexthdr __P((struct mbuf *, int, int, int *));
  350 int     ip6_lasthdr __P((struct mbuf *, int, int, int *));
  351 
  352 struct ip6aux *ip6_addaux __P((struct mbuf *));
  353 struct ip6aux *ip6_findaux __P((struct mbuf *));
  354 void    ip6_delaux __P((struct mbuf *));
  355 
  356 int     ip6_mforward __P((struct ip6_hdr *, struct ifnet *, struct mbuf *));
  357 int     ip6_process_hopopts __P((struct mbuf *, u_int8_t *, int, u_int32_t *,
  358                                  u_int32_t *));
  359 void    ip6_savecontrol __P((struct inpcb *, struct mbuf *, struct mbuf **));
  360 void    ip6_notify_pmtu __P((struct inpcb *, struct sockaddr_in6 *,
  361                              u_int32_t *));
  362 int     ip6_sysctl __P((int *, u_int, void *, size_t *, void *, size_t));
  363 
  364 void    ip6_forward __P((struct mbuf *, int));
  365 
  366 void    ip6_mloopback __P((struct ifnet *, struct mbuf *, struct sockaddr_in6 *));
  367 int     ip6_output __P((struct mbuf *, struct ip6_pktopts *,
  368                         struct route_in6 *,
  369                         int,
  370                         struct ip6_moptions *, struct ifnet **,
  371                         struct inpcb *));
  372 int     ip6_ctloutput __P((struct socket *, struct sockopt *));
  373 int     ip6_raw_ctloutput __P((struct socket *, struct sockopt *));
  374 void    ip6_initpktopts __P((struct ip6_pktopts *));
  375 int     ip6_setpktopts __P((struct mbuf *, struct ip6_pktopts *,
  376         struct ip6_pktopts *, int, int));
  377 void    ip6_clearpktopts __P((struct ip6_pktopts *, int));
  378 struct ip6_pktopts *ip6_copypktopts __P((struct ip6_pktopts *, int));
  379 int     ip6_optlen __P((struct inpcb *));
  380 
  381 int     route6_input __P((struct mbuf **, int *, int));
  382 
  383 void    frag6_init __P((void));
  384 int     frag6_input __P((struct mbuf **, int *, int));
  385 void    frag6_slowtimo __P((void));
  386 void    frag6_drain __P((void));
  387 
  388 void    rip6_init __P((void));
  389 int     rip6_input __P((struct mbuf **, int *, int));
  390 void    rip6_ctlinput __P((int, struct sockaddr *, void *));
  391 int     rip6_ctloutput __P((struct socket *, struct sockopt *));
  392 int     rip6_output __P((struct mbuf *, ...));
  393 int     rip6_usrreq __P((struct socket *,
  394             int, struct mbuf *, struct mbuf *, struct mbuf *, struct thread *));
  395 
  396 int     dest6_input __P((struct mbuf **, int *, int));
  397 int     none_input __P((struct mbuf **, int *, int));
  398 
  399 struct in6_addr *in6_selectsrc __P((struct sockaddr_in6 *,
  400         struct ip6_pktopts *, struct ip6_moptions *, struct route_in6 *,
  401         struct in6_addr *, struct ifnet **, int *));
  402 int in6_selectroute __P((struct sockaddr_in6 *, struct ip6_pktopts *,
  403         struct ip6_moptions *, struct route_in6 *, struct ifnet **,
  404         struct rtentry **, int));
  405 u_int32_t ip6_randomid __P((void));
  406 u_int32_t ip6_randomflowlabel __P((void));
  407 #endif /* _KERNEL */
  408 
  409 #endif /* !_NETINET6_IP6_VAR_H_ */

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