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 /*-
    2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. Neither the name of the project nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      $KAME: ip6_var.h,v 1.62 2001/05/03 14:51:48 itojun Exp $
   30  */
   31 
   32 /*-
   33  * Copyright (c) 1982, 1986, 1993
   34  *      The Regents of the University of California.  All rights reserved.
   35  *
   36  * Redistribution and use in source and binary forms, with or without
   37  * modification, are permitted provided that the following conditions
   38  * are met:
   39  * 1. Redistributions of source code must retain the above copyright
   40  *    notice, this list of conditions and the following disclaimer.
   41  * 2. Redistributions in binary form must reproduce the above copyright
   42  *    notice, this list of conditions and the following disclaimer in the
   43  *    documentation and/or other materials provided with the distribution.
   44  * 4. Neither the name of the University nor the names of its contributors
   45  *    may be used to endorse or promote products derived from this software
   46  *    without specific prior written permission.
   47  *
   48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   58  * SUCH DAMAGE.
   59  *
   60  *      @(#)ip_var.h    8.1 (Berkeley) 6/10/93
   61  * $FreeBSD$
   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         struct ip6asfrag *ip6q_down;
   73         struct ip6asfrag *ip6q_up;
   74         u_int32_t       ip6q_ident;
   75         u_int8_t        ip6q_nxt;
   76         u_int8_t        ip6q_ecn;
   77         u_int8_t        ip6q_ttl;
   78         struct in6_addr ip6q_src, ip6q_dst;
   79         struct ip6q     *ip6q_next;
   80         struct ip6q     *ip6q_prev;
   81         int             ip6q_unfrglen;  /* len of unfragmentable part */
   82 #ifdef notyet
   83         u_char          *ip6q_nxtp;
   84 #endif
   85         int             ip6q_nfrag;     /* # of fragments */
   86 };
   87 
   88 struct  ip6asfrag {
   89         struct ip6asfrag *ip6af_down;
   90         struct ip6asfrag *ip6af_up;
   91         struct mbuf     *ip6af_m;
   92         int             ip6af_offset;   /* offset in ip6af_m to next header */
   93         int             ip6af_frglen;   /* fragmentable part length */
   94         int             ip6af_off;      /* fragment offset */
   95         u_int16_t       ip6af_mff;      /* more fragment bit in frag off */
   96 };
   97 
   98 #define IP6_REASS_MBUF(ip6af) (*(struct mbuf **)&((ip6af)->ip6af_m))
   99 
  100 struct  ip6_moptions {
  101         struct  ifnet *im6o_multicast_ifp; /* ifp for outgoing multicasts */
  102         u_char  im6o_multicast_hlim;    /* hoplimit for outgoing multicasts */
  103         u_char  im6o_multicast_loop;    /* 1 >= hear sends if a member */
  104         LIST_HEAD(, in6_multi_mship) im6o_memberships;
  105 };
  106 
  107 /*
  108  * Control options for outgoing packets
  109  */
  110 
  111 /* Routing header related info */
  112 struct  ip6po_rhinfo {
  113         struct  ip6_rthdr *ip6po_rhi_rthdr; /* Routing header */
  114         struct  route_in6 ip6po_rhi_route; /* Route to the 1st hop */
  115 };
  116 #define ip6po_rthdr     ip6po_rhinfo.ip6po_rhi_rthdr
  117 #define ip6po_route     ip6po_rhinfo.ip6po_rhi_route
  118 
  119 /* Nexthop related info */
  120 struct  ip6po_nhinfo {
  121         struct  sockaddr *ip6po_nhi_nexthop;
  122         struct  route_in6 ip6po_nhi_route; /* Route to the nexthop */
  123 };
  124 #define ip6po_nexthop   ip6po_nhinfo.ip6po_nhi_nexthop
  125 #define ip6po_nextroute ip6po_nhinfo.ip6po_nhi_route
  126 
  127 struct  ip6_pktopts {
  128         struct  mbuf *ip6po_m;  /* Pointer to mbuf storing the data */
  129         int     ip6po_hlim;     /* Hoplimit for outgoing packets */
  130 
  131         /* Outgoing IF/address information */
  132         struct  in6_pktinfo *ip6po_pktinfo;
  133 
  134         /* Next-hop address information */
  135         struct  ip6po_nhinfo ip6po_nhinfo;
  136 
  137         struct  ip6_hbh *ip6po_hbh; /* Hop-by-Hop options header */
  138 
  139         /* Destination options header (before a routing header) */
  140         struct  ip6_dest *ip6po_dest1;
  141 
  142         /* Routing header related info. */
  143         struct  ip6po_rhinfo ip6po_rhinfo;
  144 
  145         /* Destination options header (after a routing header) */
  146         struct  ip6_dest *ip6po_dest2;
  147 
  148         int     ip6po_tclass;   /* traffic class */
  149 
  150         int     ip6po_minmtu;  /* fragment vs PMTU discovery policy */
  151 #define IP6PO_MINMTU_MCASTONLY  -1 /* default; send at min MTU for multicast*/
  152 #define IP6PO_MINMTU_DISABLE     0 /* always perform pmtu disc */
  153 #define IP6PO_MINMTU_ALL         1 /* always send at min MTU */
  154 
  155         int     ip6po_prefer_tempaddr;  /* whether temporary addresses are
  156                                            preferred as source address */
  157 #define IP6PO_TEMPADDR_SYSTEM   -1 /* follow the system default */
  158 #define IP6PO_TEMPADDR_NOTPREFER 0 /* not prefer temporary address */
  159 #define IP6PO_TEMPADDR_PREFER    1 /* prefer temporary address */
  160 
  161         int ip6po_flags;
  162 #if 0   /* parameters in this block is obsolete. do not reuse the values. */
  163 #define IP6PO_REACHCONF 0x01    /* upper-layer reachability confirmation. */
  164 #define IP6PO_MINMTU    0x02    /* use minimum MTU (IPV6_USE_MIN_MTU) */
  165 #endif
  166 #define IP6PO_DONTFRAG  0x04    /* disable fragmentation (IPV6_DONTFRAG) */
  167 #define IP6PO_USECOA    0x08    /* use care of address */
  168 };
  169 
  170 /*
  171  * Control options for incoming packets
  172  */
  173 
  174 struct  ip6stat {
  175         u_quad_t ip6s_total;            /* total packets received */
  176         u_quad_t ip6s_tooshort;         /* packet too short */
  177         u_quad_t ip6s_toosmall;         /* not enough data */
  178         u_quad_t ip6s_fragments;        /* fragments received */
  179         u_quad_t ip6s_fragdropped;      /* frags dropped(dups, out of space) */
  180         u_quad_t ip6s_fragtimeout;      /* fragments timed out */
  181         u_quad_t ip6s_fragoverflow;     /* fragments that exceeded limit */
  182         u_quad_t ip6s_forward;          /* packets forwarded */
  183         u_quad_t ip6s_cantforward;      /* packets rcvd for unreachable dest */
  184         u_quad_t ip6s_redirectsent;     /* packets forwarded on same net */
  185         u_quad_t ip6s_delivered;        /* datagrams delivered to upper level*/
  186         u_quad_t ip6s_localout;         /* total ip packets generated here */
  187         u_quad_t ip6s_odropped;         /* lost packets due to nobufs, etc. */
  188         u_quad_t ip6s_reassembled;      /* total packets reassembled ok */
  189         u_quad_t ip6s_fragmented;       /* datagrams successfully fragmented */
  190         u_quad_t ip6s_ofragments;       /* output fragments created */
  191         u_quad_t ip6s_cantfrag;         /* don't fragment flag was set, etc. */
  192         u_quad_t ip6s_badoptions;       /* error in option processing */
  193         u_quad_t ip6s_noroute;          /* packets discarded due to no route */
  194         u_quad_t ip6s_badvers;          /* ip6 version != 6 */
  195         u_quad_t ip6s_rawout;           /* total raw ip packets generated */
  196         u_quad_t ip6s_badscope;         /* scope error */
  197         u_quad_t ip6s_notmember;        /* don't join this multicast group */
  198         u_quad_t ip6s_nxthist[256];     /* next header history */
  199         u_quad_t ip6s_m1;               /* one mbuf */
  200         u_quad_t ip6s_m2m[32];          /* two or more mbuf */
  201         u_quad_t ip6s_mext1;            /* one ext mbuf */
  202         u_quad_t ip6s_mext2m;           /* two or more ext mbuf */
  203         u_quad_t ip6s_exthdrtoolong;    /* ext hdr are not continuous */
  204         u_quad_t ip6s_nogif;            /* no match gif found */
  205         u_quad_t ip6s_toomanyhdr;       /* discarded due to too many headers */
  206 
  207         /*
  208          * statistics for improvement of the source address selection
  209          * algorithm:
  210          * XXX: hardcoded 16 = # of ip6 multicast scope types + 1
  211          */
  212         /* number of times that address selection fails */
  213         u_quad_t ip6s_sources_none;
  214         /* number of times that an address on the outgoing I/F is chosen */
  215         u_quad_t ip6s_sources_sameif[16];
  216         /* number of times that an address on a non-outgoing I/F is chosen */
  217         u_quad_t ip6s_sources_otherif[16];
  218         /*
  219          * number of times that an address that has the same scope
  220          * from the destination is chosen.
  221          */
  222         u_quad_t ip6s_sources_samescope[16];
  223         /*
  224          * number of times that an address that has a different scope
  225          * from the destination is chosen.
  226          */
  227         u_quad_t ip6s_sources_otherscope[16];
  228         /* number of times that a deprecated address is chosen */
  229         u_quad_t ip6s_sources_deprecated[16];
  230 
  231         u_quad_t ip6s_forward_cachehit;
  232         u_quad_t ip6s_forward_cachemiss;
  233 
  234         /* number of times that each rule of source selection is applied. */
  235         u_quad_t ip6s_sources_rule[16];
  236 };
  237 
  238 #ifdef _KERNEL
  239 /*
  240  * IPv6 onion peeling state.
  241  * it will be initialized when we come into ip6_input().
  242  * XXX do not make it a kitchen sink!
  243  */
  244 struct ip6aux {
  245         u_int32_t ip6a_flags;
  246 #define IP6A_SWAP       0x01            /* swapped home/care-of on packet */
  247 #define IP6A_HASEEN     0x02            /* HA was present */
  248 #define IP6A_BRUID      0x04            /* BR Unique Identifier was present */
  249 #define IP6A_RTALERTSEEN 0x08           /* rtalert present */
  250 
  251         /* ip6.ip6_src */
  252         struct in6_addr ip6a_careof;    /* care-of address of the peer */
  253         struct in6_addr ip6a_home;      /* home address of the peer */
  254         u_int16_t       ip6a_bruid;     /* BR unique identifier */
  255 
  256         /* ip6.ip6_dst */
  257         struct in6_ifaddr *ip6a_dstia6; /* my ifaddr that matches ip6_dst */
  258 
  259         /* rtalert */
  260         u_int16_t ip6a_rtalert;         /* rtalert option value */
  261 
  262         /*
  263          * decapsulation history will be here.
  264          * with IPsec it may not be accurate.
  265          */
  266 };
  267 #endif
  268 
  269 #ifdef _KERNEL
  270 /* flags passed to ip6_output as last parameter */
  271 #define IPV6_UNSPECSRC          0x01    /* allow :: as the source address */
  272 #define IPV6_FORWARDING         0x02    /* most of IPv6 header exists */
  273 #define IPV6_MINMTU             0x04    /* use minimum MTU (IPV6_USE_MIN_MTU) */
  274 
  275 #ifdef __NO_STRICT_ALIGNMENT
  276 #define IP6_HDR_ALIGNED_P(ip)   1
  277 #else
  278 #define IP6_HDR_ALIGNED_P(ip)   ((((intptr_t) (ip)) & 3) == 0)
  279 #endif
  280 
  281 extern struct   ip6stat ip6stat;        /* statistics */
  282 extern int      ip6_defhlim;            /* default hop limit */
  283 extern int      ip6_defmcasthlim;       /* default multicast hop limit */
  284 extern int      ip6_forwarding;         /* act as router? */
  285 extern int      ip6_forward_srcrt;      /* forward src-routed? */
  286 extern int      ip6_gif_hlim;           /* Hop limit for gif encap packet */
  287 extern int      ip6_use_deprecated;     /* allow deprecated addr as source */
  288 extern int      ip6_rr_prune;           /* router renumbering prefix
  289                                          * walk list every 5 sec.    */
  290 extern int      ip6_mcast_pmtu;         /* enable pMTU discovery for multicast? */
  291 extern int      ip6_v6only;
  292 
  293 extern struct socket *ip6_mrouter;      /* multicast routing daemon */
  294 extern int      ip6_sendredirects;      /* send IP redirects when forwarding? */
  295 extern int      ip6_maxfragpackets; /* Maximum packets in reassembly queue */
  296 extern int      ip6_maxfrags;   /* Maximum fragments in reassembly queue */
  297 extern int      ip6_sourcecheck;        /* Verify source interface */
  298 extern int      ip6_sourcecheck_interval; /* Interval between log messages */
  299 extern int      ip6_accept_rtadv;       /* Acts as a host not a router */
  300 extern int      ip6_keepfaith;          /* Firewall Aided Internet Translator */
  301 extern int      ip6_log_interval;
  302 extern time_t   ip6_log_time;
  303 extern int      ip6_hdrnestlimit; /* upper limit of # of extension headers */
  304 extern int      ip6_dad_count;          /* DupAddrDetectionTransmits */
  305 
  306 extern int ip6_auto_flowlabel;
  307 extern int ip6_auto_linklocal;
  308 
  309 extern int   ip6_anonportmin;           /* minimum ephemeral port */
  310 extern int   ip6_anonportmax;           /* maximum ephemeral port */
  311 extern int   ip6_lowportmin;            /* minimum reserved port */
  312 extern int   ip6_lowportmax;            /* maximum reserved port */
  313 
  314 extern int      ip6_use_tempaddr; /* whether to use temporary addresses. */
  315 extern int      ip6_prefer_tempaddr; /* whether to prefer temporary addresses
  316                                         in the source address selection */
  317 
  318 extern int      ip6_use_defzone; /* whether to use the default scope zone
  319                                     when unspecified */
  320 
  321 extern  struct pfil_head inet6_pfil_hook;       /* packet filter hooks */
  322 #ifdef IPSTEALTH
  323 extern int      ip6stealth;
  324 #endif
  325 
  326 extern struct   pr_usrreqs rip6_usrreqs;
  327 struct sockopt;
  328 
  329 struct inpcb;
  330 
  331 int     icmp6_ctloutput __P((struct socket *, struct sockopt *sopt));
  332 
  333 struct in6_ifaddr;
  334 void    ip6_init __P((void));
  335 void    ip6_input __P((struct mbuf *));
  336 struct in6_ifaddr *ip6_getdstifaddr __P((struct mbuf *));
  337 void    ip6_freepcbopts __P((struct ip6_pktopts *));
  338 void    ip6_freemoptions __P((struct ip6_moptions *));
  339 int     ip6_unknown_opt __P((u_int8_t *, struct mbuf *, int));
  340 char *  ip6_get_prevhdr __P((struct mbuf *, int));
  341 int     ip6_nexthdr __P((struct mbuf *, int, int, int *));
  342 int     ip6_lasthdr __P((struct mbuf *, int, int, int *));
  343 
  344 struct ip6aux *ip6_addaux __P((struct mbuf *));
  345 struct ip6aux *ip6_findaux __P((struct mbuf *));
  346 void    ip6_delaux __P((struct mbuf *));
  347 
  348 int     ip6_mforward __P((struct ip6_hdr *, struct ifnet *, struct mbuf *));
  349 int     ip6_process_hopopts __P((struct mbuf *, u_int8_t *, int, u_int32_t *,
  350                                  u_int32_t *));
  351 void    ip6_savecontrol __P((struct inpcb *, struct mbuf *, struct mbuf **));
  352 void    ip6_notify_pmtu __P((struct inpcb *, struct sockaddr_in6 *,
  353                              u_int32_t *));
  354 int     ip6_sysctl __P((int *, u_int, void *, size_t *, void *, size_t));
  355 
  356 void    ip6_forward __P((struct mbuf *, int));
  357 
  358 void    ip6_mloopback __P((struct ifnet *, struct mbuf *, struct sockaddr_in6 *));
  359 int     ip6_output __P((struct mbuf *, struct ip6_pktopts *,
  360                         struct route_in6 *,
  361                         int,
  362                         struct ip6_moptions *, struct ifnet **,
  363                         struct inpcb *));
  364 int     ip6_ctloutput __P((struct socket *, struct sockopt *));
  365 int     ip6_raw_ctloutput __P((struct socket *, struct sockopt *));
  366 void    ip6_initpktopts __P((struct ip6_pktopts *));
  367 int     ip6_setpktopts __P((struct mbuf *, struct ip6_pktopts *,
  368         struct ip6_pktopts *, int, int));
  369 void    ip6_clearpktopts __P((struct ip6_pktopts *, int));
  370 struct ip6_pktopts *ip6_copypktopts __P((struct ip6_pktopts *, int));
  371 int     ip6_optlen __P((struct inpcb *));
  372 
  373 int     route6_input __P((struct mbuf **, int *, int));
  374 
  375 void    frag6_init __P((void));
  376 int     frag6_input __P((struct mbuf **, int *, int));
  377 void    frag6_slowtimo __P((void));
  378 void    frag6_drain __P((void));
  379 
  380 void    rip6_init __P((void));
  381 int     rip6_input __P((struct mbuf **, int *, int));
  382 void    rip6_ctlinput __P((int, struct sockaddr *, void *));
  383 int     rip6_ctloutput __P((struct socket *, struct sockopt *));
  384 int     rip6_output __P((struct mbuf *, ...));
  385 int     rip6_usrreq __P((struct socket *,
  386             int, struct mbuf *, struct mbuf *, struct mbuf *, struct thread *));
  387 
  388 int     dest6_input __P((struct mbuf **, int *, int));
  389 int     none_input __P((struct mbuf **, int *, int));
  390 
  391 struct in6_addr *in6_selectsrc __P((struct sockaddr_in6 *,
  392         struct ip6_pktopts *, struct ip6_moptions *, struct route_in6 *,
  393         struct in6_addr *, struct ifnet **, int *));
  394 int in6_selectroute __P((struct sockaddr_in6 *, struct ip6_pktopts *,
  395         struct ip6_moptions *, struct route_in6 *, struct ifnet **,
  396         struct rtentry **, int));
  397 u_int32_t ip6_randomid __P((void));
  398 u_int32_t ip6_randomflowlabel __P((void));
  399 #endif /* _KERNEL */
  400 
  401 #endif /* !_NETINET6_IP6_VAR_H_ */

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