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: src/sys/netinet6/ip6_var.h,v 1.2.2.4 2003/01/23 21:06:47 sam Exp $    */
    2 /*      $DragonFly: src/sys/netinet6/ip6_var.h,v 1.13 2008/09/04 09:08:22 hasso Exp $   */
    3 /*      $KAME: ip6_var.h,v 1.62 2001/05/03 14:51:48 itojun Exp $        */
    4 
    5 /*
    6  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    7  * All rights reserved.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  * 3. Neither the name of the project nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  */
   33 
   34 /*
   35  * Copyright (c) 1982, 1986, 1993
   36  *      The Regents of the University of California.  All rights reserved.
   37  *
   38  * Redistribution and use in source and binary forms, with or without
   39  * modification, are permitted provided that the following conditions
   40  * are met:
   41  * 1. Redistributions of source code must retain the above copyright
   42  *    notice, this list of conditions and the following disclaimer.
   43  * 2. Redistributions in binary form must reproduce the above copyright
   44  *    notice, this list of conditions and the following disclaimer in the
   45  *    documentation and/or other materials provided with the distribution.
   46  * 3. All advertising materials mentioning features or use of this software
   47  *    must display the following acknowledgement:
   48  *      This product includes software developed by the University of
   49  *      California, Berkeley and its contributors.
   50  * 4. Neither the name of the University nor the names of its contributors
   51  *    may be used to endorse or promote products derived from this software
   52  *    without specific prior written permission.
   53  *
   54  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   55  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   56  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   57  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   58  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   59  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   60  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   61  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   62  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   63  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   64  * SUCH DAMAGE.
   65  *
   66  *      @(#)ip_var.h    8.1 (Berkeley) 6/10/93
   67  */
   68 
   69 #ifndef _NETINET6_IP6_VAR_H_
   70 #define _NETINET6_IP6_VAR_H_
   71 
   72 #ifndef _SYS_TYPES_H_
   73 #include <sys/types.h>
   74 #endif
   75 #ifndef _SYS_QUEUE_H_
   76 #include <sys/queue.h>
   77 #endif
   78 #ifndef _NETINET_IN_H_
   79 #include <netinet/in.h>
   80 #endif
   81 
   82 /*
   83  * IP6 reassembly queue structure.  Each fragment
   84  * being reassembled is attached to one of these structures.
   85  */
   86 struct  ip6q {
   87         u_int32_t       ip6q_head;
   88         u_int16_t       ip6q_len;
   89         u_int8_t        ip6q_nxt;       /* ip6f_nxt in first fragment */
   90         u_int8_t        ip6q_hlim;
   91         struct ip6asfrag *ip6q_down;
   92         struct ip6asfrag *ip6q_up;
   93         u_int32_t       ip6q_ident;
   94         u_int8_t        ip6q_arrive;
   95         u_int8_t        ip6q_ttl;
   96         struct in6_addr ip6q_src, ip6q_dst;
   97         struct ip6q     *ip6q_next;
   98         struct ip6q     *ip6q_prev;
   99         int             ip6q_unfrglen;  /* len of unfragmentable part */
  100 #ifdef notyet
  101         u_char          *ip6q_nxtp;
  102 #endif
  103 };
  104 
  105 struct  ip6asfrag {
  106         u_int32_t       ip6af_head;
  107         u_int16_t       ip6af_len;
  108         u_int8_t        ip6af_nxt;
  109         u_int8_t        ip6af_hlim;
  110         /* must not override the above members during reassembling */
  111         struct ip6asfrag *ip6af_down;
  112         struct ip6asfrag *ip6af_up;
  113         struct mbuf     *ip6af_m;
  114         int             ip6af_offset;   /* offset in ip6af_m to next header */
  115         int             ip6af_frglen;   /* fragmentable part length */
  116         int             ip6af_off;      /* fragment offset */
  117         u_int16_t       ip6af_mff;      /* more fragment bit in frag off */
  118 };
  119 
  120 #define IP6_REASS_MBUF(ip6af) (*(struct mbuf **)&((ip6af)->ip6af_m))
  121 
  122 struct  ip6_moptions {
  123         struct  ifnet *im6o_multicast_ifp; /* ifp for outgoing multicasts */
  124         u_char  im6o_multicast_hlim;    /* hoplimit for outgoing multicasts */
  125         u_char  im6o_multicast_loop;    /* 1 >= hear sends if a member */
  126         LIST_HEAD(, in6_multi_mship) im6o_memberships;
  127 };
  128 
  129 /*
  130  * Control options for outgoing packets
  131  */
  132 
  133 /* Routing header related info */
  134 struct  ip6po_rhinfo {
  135         struct  ip6_rthdr *ip6po_rhi_rthdr; /* Routing header */
  136         struct  route_in6 ip6po_rhi_route; /* Route to the 1st hop */
  137 };
  138 #define ip6po_rthdr     ip6po_rhinfo.ip6po_rhi_rthdr
  139 #define ip6po_route     ip6po_rhinfo.ip6po_rhi_route
  140 
  141 /* Nexthop related info */
  142 struct  ip6po_nhinfo {
  143         struct  sockaddr *ip6po_nhi_nexthop;
  144         struct  route_in6 ip6po_nhi_route; /* Route to the nexthop */
  145 };
  146 #define ip6po_nexthop   ip6po_nhinfo.ip6po_nhi_nexthop
  147 #define ip6po_nextroute ip6po_nhinfo.ip6po_nhi_route
  148 
  149 struct  ip6_pktopts {
  150         struct  mbuf *ip6po_m;  /* Pointer to mbuf storing the data */
  151         int     ip6po_hlim;     /* Hoplimit for outgoing packets */
  152 
  153         /* Outgoing IF/address information */
  154         struct  in6_pktinfo *ip6po_pktinfo;
  155 
  156         /* Next-hop address information */
  157         struct  ip6po_nhinfo ip6po_nhinfo;
  158         
  159         struct  ip6_hbh *ip6po_hbh; /* Hop-by-Hop options header */
  160 
  161         /* Destination options header (before a routing header) */
  162         struct  ip6_dest *ip6po_dest1;
  163 
  164         /* Routing header related info. */
  165         struct  ip6po_rhinfo ip6po_rhinfo;
  166 
  167         /* Destination options header (after a routing header) */
  168         struct  ip6_dest *ip6po_dest2;
  169         /*
  170          * below fields are introduced in RFC3542
  171          */
  172         int     ip6po_tclass;   /* traffic class */
  173         int     ip6po_minmtu;  /* fragment vs PMTU discovery policy */
  174 #define IP6PO_MINMTU_MCASTONLY  -1 /* default; send at min MTU for multicast*/
  175 #define IP6PO_MINMTU_DISABLE     0 /* always perform pmtu disc */
  176 #define IP6PO_MINMTU_ALL         1 /* always send at min MTU */
  177         int     ip6po_prefer_tempaddr;  /* whether temporary addresses are
  178                                            preferred as source address */
  179 #define IP6PO_TEMPADDR_SYSTEM   -1 /* follow the system default */
  180 #define IP6PO_TEMPADDR_NOTPREFER 0 /* not prefer temporary address */
  181 #define IP6PO_TEMPADDR_PREFER    1 /* prefer temporary address */
  182 
  183         int ip6po_flags;
  184 #if 0   /* Parameters in this block are obsolete. Do not reuse the values. */
  185 #define IP6PO_REACHCONF 0x01    /* upper-layer reachability confirmation. */
  186 #define IP6PO_MINMTU    0x02    /* use minimum MTU (IPV6_USE_MIN_MTU) */
  187 #endif
  188 #define IP6PO_DONTFRAG  0x04    /* disable fragmentation (IPV6_DONTFRAG) */
  189 #define IP6PO_USECOA    0x08    /* use care of address */
  190 };
  191 
  192 /*
  193  * Control options for incoming packets
  194  */
  195 struct  ip6stat {
  196         u_quad_t ip6s_total;            /* total packets received */
  197         u_quad_t ip6s_tooshort;         /* packet too short */
  198         u_quad_t ip6s_toosmall;         /* not enough data */
  199         u_quad_t ip6s_fragments;        /* fragments received */
  200         u_quad_t ip6s_fragdropped;      /* frags dropped(dups, out of space) */
  201         u_quad_t ip6s_fragtimeout;      /* fragments timed out */
  202         u_quad_t ip6s_fragoverflow;     /* fragments that exceeded limit */
  203         u_quad_t ip6s_forward;          /* packets forwarded */
  204         u_quad_t ip6s_cantforward;      /* packets rcvd for unreachable dest */
  205         u_quad_t ip6s_redirectsent;     /* packets forwarded on same net */
  206         u_quad_t ip6s_delivered;        /* datagrams delivered to upper level*/
  207         u_quad_t ip6s_localout;         /* total ip packets generated here */
  208         u_quad_t ip6s_odropped;         /* lost packets due to nobufs, etc. */
  209         u_quad_t ip6s_reassembled;      /* total packets reassembled ok */
  210         u_quad_t ip6s_fragmented;       /* datagrams successfully fragmented */
  211         u_quad_t ip6s_ofragments;       /* output fragments created */
  212         u_quad_t ip6s_cantfrag;         /* don't fragment flag was set, etc. */
  213         u_quad_t ip6s_badoptions;       /* error in option processing */
  214         u_quad_t ip6s_noroute;          /* packets discarded due to no route */
  215         u_quad_t ip6s_badvers;          /* ip6 version != 6 */
  216         u_quad_t ip6s_rawout;           /* total raw ip packets generated */
  217         u_quad_t ip6s_badscope;         /* scope error */
  218         u_quad_t ip6s_notmember;        /* don't join this multicast group */
  219         u_quad_t ip6s_nxthist[256];     /* next header history */
  220         u_quad_t ip6s_m1;               /* one mbuf */
  221         u_quad_t ip6s_m2m[32];          /* two or more mbuf */
  222         u_quad_t ip6s_mext1;            /* one ext mbuf */
  223         u_quad_t ip6s_mext2m;           /* two or more ext mbuf */
  224         u_quad_t ip6s_exthdrtoolong;    /* ext hdr are not continuous */
  225         u_quad_t ip6s_nogif;            /* no match gif found */
  226         u_quad_t ip6s_toomanyhdr;       /* discarded due to too many headers */
  227 
  228         /*
  229          * statistics for improvement of the source address selection
  230          * algorithm:
  231          * XXX: hardcoded 16 = # of ip6 multicast scope types + 1
  232          */
  233         /* number of times that address selection fails */
  234         u_quad_t ip6s_sources_none;
  235         /* number of times that an address on the outgoing I/F is chosen */
  236         u_quad_t ip6s_sources_sameif[16];
  237         /* number of times that an address on a non-outgoing I/F is chosen */
  238         u_quad_t ip6s_sources_otherif[16];
  239         /*
  240          * number of times that an address that has the same scope
  241          * from the destination is chosen.
  242          */
  243         u_quad_t ip6s_sources_samescope[16];
  244         /*
  245          * number of times that an address that has a different scope
  246          * from the destination is chosen.
  247          */
  248         u_quad_t ip6s_sources_otherscope[16];
  249         /* number of times that an deprecated address is chosen */
  250         u_quad_t ip6s_sources_deprecated[16];
  251 
  252         u_quad_t ip6s_forward_cachehit;
  253         u_quad_t ip6s_forward_cachemiss;
  254 };
  255 
  256 #ifdef _KERNEL
  257 /*
  258  * IPv6 onion peeling state.
  259  * it will be initialized when we come into ip6_input().
  260  * XXX do not make it a kitchen sink!
  261  */
  262 struct ip6aux {
  263         u_int32_t ip6a_flags;
  264 #define IP6A_SWAP       0x01            /* swapped home/care-of on packet */
  265 #define IP6A_HASEEN     0x02            /* HA was present */
  266 #define IP6A_BRUID      0x04            /* BR Unique Identifier was present */
  267 #define IP6A_RTALERTSEEN 0x08           /* rtalert present */
  268 
  269         /* ip6.ip6_src */
  270         struct in6_addr ip6a_careof;    /* care-of address of the peer */
  271         struct in6_addr ip6a_home;      /* home address of the peer */
  272         u_int16_t       ip6a_bruid;     /* BR unique identifier */
  273 
  274         /* ip6.ip6_dst */
  275         struct in6_ifaddr *ip6a_dstia6; /* my ifaddr that matches ip6_dst */
  276 
  277         /* rtalert */
  278         u_int16_t ip6a_rtalert;         /* rtalert option value */
  279 
  280         /*
  281          * decapsulation history will be here.
  282          * with IPsec it may not be accurate.
  283          */
  284 };
  285 #endif
  286 
  287 #ifdef _KERNEL
  288 /* flags passed to ip6_output as last parameter */
  289 #define IPV6_DADOUTPUT          0x01    /* DAD */
  290 #define IPV6_FORWARDING         0x02    /* most of IPv6 header exists */
  291 #define IPV6_MINMTU             0x04    /* use minimum MTU (IPV6_USE_MIN_MTU) */
  292 
  293 /* direction passed to ip_hashfn as last parameter */
  294 #define IP6_MPORT_IN            0 /* Find lwkt port for incoming packets */
  295 #define IP6_MPORT_OUT           1 /* Find lwkt port for outgoing packets */
  296 
  297 extern struct   ip6stat ip6stat;        /* statistics */
  298 extern u_int32_t ip6_id;                /* fragment identifier */
  299 extern int      ip6_defhlim;            /* default hop limit */
  300 extern int      ip6_defmcasthlim;       /* default multicast hop limit */
  301 extern int      ip6_forwarding;         /* act as router? */
  302 extern int      ip6_forward_srcrt;      /* forward src-routed? */
  303 extern int      ip6_gif_hlim;           /* Hop limit for gif encap packet */
  304 extern int      ip6_use_deprecated;     /* allow deprecated addr as source */
  305 extern int      ip6_rr_prune;           /* router renumbering prefix
  306                                          * walk list every 5 sec.    */
  307 extern int      ip6_v6only;
  308 
  309 extern struct socket *ip6_mrouter;      /* multicast routing daemon */
  310 extern int      ip6_sendredirects;      /* send IP redirects when forwarding? */
  311 extern int      ip6_maxfragpackets; /* Maximum packets in reassembly queue */
  312 extern int      ip6_sourcecheck;        /* Verify source interface */
  313 extern int      ip6_sourcecheck_interval; /* Interval between log messages */
  314 extern int      ip6_accept_rtadv;       /* Acts as a host not a router */
  315 extern int      ip6_keepfaith;          /* Firewall Aided Internet Translator */
  316 extern int      ip6_log_interval;
  317 extern time_t   ip6_log_time;
  318 extern int      ip6_hdrnestlimit; /* upper limit of # of extension headers */
  319 extern int      ip6_dad_count;          /* DupAddrDetectionTransmits */
  320 
  321 extern u_int32_t ip6_flow_seq;
  322 extern int ip6_auto_flowlabel;
  323 extern int ip6_auto_linklocal;
  324 
  325 extern int   ip6_anonportmin;           /* minimum ephemeral port */
  326 extern int   ip6_anonportmax;           /* maximum ephemeral port */
  327 extern int   ip6_lowportmin;            /* minimum reserved port */
  328 extern int   ip6_lowportmax;            /* maximum reserved port */
  329 
  330 extern int      ip6_use_tempaddr; /* whether to use temporary addresses. */
  331 
  332 extern struct pfil_head inet6_pfil_hook;
  333 
  334 extern struct   pr_usrreqs rip6_usrreqs;
  335 
  336 struct proc;
  337 struct inpcb;
  338 struct sockopt;
  339 struct in6_ifaddr;
  340 struct ip6_hdr;
  341 union netmsg;
  342 
  343 void    icmp6_ctloutput (union netmsg *);
  344 
  345 void    ip6_init (void);
  346 void    ip6intr (void);
  347 struct in6_ifaddr *ip6_getdstifaddr (struct mbuf *);
  348 void    ip6_freepcbopts (struct ip6_pktopts *);
  349 void    ip6_freemoptions (struct ip6_moptions *);
  350 int     ip6_unknown_opt (u_int8_t *, struct mbuf *, int);
  351 char *  ip6_get_prevhdr (struct mbuf *, int);
  352 int     ip6_nexthdr (struct mbuf *, int, int, int *);
  353 int     ip6_lasthdr (struct mbuf *, int, int, int *);
  354 
  355 struct ip6aux *ip6_addaux (struct mbuf *);
  356 struct ip6aux *ip6_findaux (struct mbuf *);
  357 void    ip6_delaux (struct mbuf *);
  358 
  359 int     ip6_mforward (struct ip6_hdr *, struct ifnet *, struct mbuf *);
  360 int     ip6_process_hopopts (struct mbuf *, u_int8_t *, int, u_int32_t *,
  361                                  u_int32_t *);
  362 void    ip6_savecontrol (struct inpcb *, struct mbuf **, struct ip6_hdr *,
  363                              struct mbuf *);
  364 void    ip6_notify_pmtu (struct inpcb *, struct sockaddr_in6 *,
  365                              u_int32_t *);
  366 int     ip6_sysctl (int *, u_int, void *, size_t *, void *, size_t);
  367 
  368 void    ip6_forward (struct mbuf *, int);
  369 
  370 void    ip6_mloopback (struct ifnet *, struct mbuf *, struct sockaddr_in6 *);
  371 int     ip6_output (struct mbuf *, struct ip6_pktopts *,
  372                         struct route_in6 *,
  373                         int,
  374                         struct ip6_moptions *, struct ifnet **,
  375                         struct inpcb *);
  376 void    ip6_ctloutput_dispatch(netmsg_t msg);
  377 int     ip6_ctloutput (struct socket *, struct sockopt *sopt);
  378 int     ip6_raw_ctloutput (struct socket *, struct sockopt *);
  379 void    init_ip6pktopts (struct ip6_pktopts *);
  380 int
  381 ip6_setpktoptions(struct mbuf *, struct ip6_pktopts *,
  382     struct ip6_pktopts *, int , int);
  383 void    ip6_clearpktopts (struct ip6_pktopts *, int);
  384 struct ip6_pktopts *ip6_copypktopts (struct ip6_pktopts *, int);
  385 int     ip6_optlen (struct inpcb *);
  386 
  387 int     route6_input (struct mbuf **, int *, int);
  388 
  389 void    frag6_init (void);
  390 int     frag6_input (struct mbuf **, int *, int);
  391 void    frag6_slowtimo (void);
  392 void    frag6_drain (void);
  393 
  394 void    rip6_init (void);
  395 int     rip6_input (struct mbuf **mp, int *offp, int proto);
  396 void    rip6_ctlinput (union netmsg *);
  397 void    rip6_ctloutput (union netmsg *);
  398 int     rip6_output (struct mbuf *, struct socket *, ...);
  399 int     rip6_usrreq (struct socket *,
  400             int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *);
  401 
  402 int     dest6_input (struct mbuf **, int *, int);
  403 int     none_input (struct mbuf **, int *, int);
  404 #endif /* _KERNEL */
  405 
  406 #endif /* !_NETINET6_IP6_VAR_H_ */

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