The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: 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 /*      $NetBSD: ip6_var.h,v 1.54 2011/05/03 17:44:30 dyoung Exp $      */
    2 /*      $KAME: ip6_var.h,v 1.33 2000/06/11 14:59:20 jinmei 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  * 3. 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 #include <sys/socketvar.h>
   68 #include <net/route.h>
   69 
   70 /*
   71  * IP6 reassembly queue structure.  Each fragment
   72  * being reassembled is attached to one of these structures.
   73  */
   74 struct  ip6q {
   75         u_int32_t       ip6q_head;
   76         u_int16_t       ip6q_len;
   77         u_int8_t        ip6q_nxt;       /* ip6f_nxt in first fragment */
   78         u_int8_t        ip6q_hlim;
   79         struct ip6asfrag *ip6q_down;
   80         struct ip6asfrag *ip6q_up;
   81         u_int32_t       ip6q_ident;
   82         u_int8_t        ip6q_arrive;
   83         u_int8_t        ip6q_ttl;
   84         struct in6_addr ip6q_src, ip6q_dst;
   85         struct ip6q     *ip6q_next;
   86         struct ip6q     *ip6q_prev;
   87         int             ip6q_unfrglen;  /* len of unfragmentable part */
   88 #ifdef notyet
   89         u_char          *ip6q_nxtp;
   90 #endif
   91         int             ip6q_nfrag;     /* # of fragments */
   92 };
   93 
   94 struct  ip6asfrag {
   95         u_int32_t       ip6af_head;
   96         u_int16_t       ip6af_len;
   97         u_int8_t        ip6af_nxt;
   98         u_int8_t        ip6af_hlim;
   99         /* must not override the above members during reassembling */
  100         struct ip6asfrag *ip6af_down;
  101         struct ip6asfrag *ip6af_up;
  102         struct mbuf     *ip6af_m;
  103         int             ip6af_offset;   /* offset in ip6af_m to next header */
  104         int             ip6af_frglen;   /* fragmentable part length */
  105         int             ip6af_off;      /* fragment offset */
  106         u_int16_t       ip6af_mff;      /* more fragment bit in frag off */
  107 };
  108 
  109 #define IP6_REASS_MBUF(ip6af) ((ip6af)->ip6af_m)
  110 
  111 struct  ip6_moptions {
  112         struct  ifnet *im6o_multicast_ifp; /* ifp for outgoing multicasts */
  113         u_char  im6o_multicast_hlim;    /* hoplimit for outgoing multicasts */
  114         u_char  im6o_multicast_loop;    /* 1 >= hear sends if a member */
  115         LIST_HEAD(, in6_multi_mship) im6o_memberships;
  116 };
  117 
  118 /*
  119  * Control options for outgoing packets
  120  */
  121 
  122 /* Routing header related info */
  123 struct  ip6po_rhinfo {
  124         struct  ip6_rthdr *ip6po_rhi_rthdr; /* Routing header */
  125         struct  route ip6po_rhi_route; /* Route to the 1st hop */
  126 };
  127 #define ip6po_rthdr     ip6po_rhinfo.ip6po_rhi_rthdr
  128 #define ip6po_route     ip6po_rhinfo.ip6po_rhi_route
  129 
  130 /* Nexthop related info */
  131 struct  ip6po_nhinfo {
  132         struct  sockaddr *ip6po_nhi_nexthop;
  133         struct  route ip6po_nhi_route; /* Route to the nexthop */
  134 };
  135 #define ip6po_nexthop   ip6po_nhinfo.ip6po_nhi_nexthop
  136 #define ip6po_nextroute ip6po_nhinfo.ip6po_nhi_route
  137 
  138 struct  ip6_pktopts {
  139         int     ip6po_hlim;             /* Hoplimit for outgoing packets */
  140         struct  in6_pktinfo *ip6po_pktinfo; /* Outgoing IF/address information */
  141         struct  ip6po_nhinfo ip6po_nhinfo; /* Next-hop address information */
  142         struct  ip6_hbh *ip6po_hbh; /* Hop-by-Hop options header */
  143         struct  ip6_dest *ip6po_dest1; /* Destination options header(1st part) */
  144         struct  ip6po_rhinfo ip6po_rhinfo; /* Routing header related info. */
  145         struct  ip6_dest *ip6po_dest2; /* Destination options header(2nd part) */
  146         int     ip6po_tclass;   /* traffic class */
  147         int     ip6po_minmtu;  /* fragment vs PMTU discovery policy */
  148 #define IP6PO_MINMTU_MCASTONLY  -1 /* default; send at min MTU for multicast*/
  149 #define IP6PO_MINMTU_DISABLE     0 /* always perform pmtu disc */
  150 #define IP6PO_MINMTU_ALL         1 /* always send at min MTU */
  151         int ip6po_flags;
  152 #if 0   /* parameters in this block is obsolete. do not reuse the values. */
  153 #define IP6PO_REACHCONF 0x01    /* upper-layer reachability confirmation. */
  154 #define IP6PO_MINMTU    0x02    /* use minimum MTU (IPV6_USE_MIN_MTU) */
  155 #endif
  156 #define IP6PO_DONTFRAG  0x04    /* disable fragmentation (IPV6_DONTFRAG) */
  157 };
  158 
  159 /*
  160  * IPv6 statistics.
  161  * Each counter is an unsigned 64-bit value.
  162  */
  163 #define IP6_STAT_TOTAL          0       /* total packets received */
  164 #define IP6_STAT_TOOSHORT       1       /* packet too short */
  165 #define IP6_STAT_TOOSMALL       2       /* not enough data */
  166 #define IP6_STAT_FRAGMENTS      3       /* fragments received */
  167 #define IP6_STAT_FRAGDROPPED    4       /* frags dropped (dups, out of space) */
  168 #define IP6_STAT_FRAGTIMEOUT    5       /* fragments timed out */
  169 #define IP6_STAT_FRAGOVERFLOW   6       /* fragments that exceed limit */
  170 #define IP6_STAT_FORWARD        7       /* packets forwarded */
  171 #define IP6_STAT_CANTFORWARD    8       /* packets rcvd for uncreachable dst */
  172 #define IP6_STAT_REDIRECTSENT   9       /* packets forwarded on same net */
  173 #define IP6_STAT_DELIVERED      10      /* datagrams delivered to upper level */
  174 #define IP6_STAT_LOCALOUT       11      /* total IP packets generated here */
  175 #define IP6_STAT_ODROPPED       12      /* lost packets due to nobufs, etc. */
  176 #define IP6_STAT_REASSEMBLED    13      /* total packets reassembled ok */
  177 #define IP6_STAT_FRAGMENTED     14      /* datagrams successfully fragmented */
  178 #define IP6_STAT_OFRAGMENTS     15      /* output fragments created */
  179 #define IP6_STAT_CANTFRAG       16      /* don't fragment flag was set, etc. */
  180 #define IP6_STAT_BADOPTIONS     17      /* error in option processing */
  181 #define IP6_STAT_NOROUTE        18      /* packets discarded due to no route */
  182 #define IP6_STAT_BADVERS        19      /* ip6 version != 6 */
  183 #define IP6_STAT_RAWOUT         20      /* total raw ip packets generated */
  184 #define IP6_STAT_BADSCOPE       21      /* scope error */
  185 #define IP6_STAT_NOTMEMBER      22      /* don't join this multicast group */
  186 #define IP6_STAT_NXTHIST        23      /* next header histogram */
  187                 /* space for 256 counters */
  188 #define IP6_STAT_M1             279     /* one mbuf */
  189 #define IP6_STAT_M2M            280     /* two or more mbuf */
  190                 /* space for 32 counters */
  191 #define IP6_STAT_MEXT1          312     /* one ext mbuf */
  192 #define IP6_STAT_MEXT2M         313     /* two or more ext mbuf */
  193 #define IP6_STAT_EXTHDRTOOLONG  314     /* ext hdr are not contiguous */
  194 #define IP6_STAT_NOGIF          315     /* no match gif found */
  195 #define IP6_STAT_TOOMANYHDR     316     /* discarded due to too many headers */
  196         /*
  197          * statistics for improvement of the source address selection
  198          * algorithm:
  199          * XXX: hardcoded 16 = # of ip6 multicast scope types + 1
  200          */
  201 #define IP6_STAT_SOURCES_NONE   317     /* number of times that address
  202                                            selection fails */
  203 #define IP6_STAT_SOURCES_SAMEIF 318     /* number of times that an address
  204                                            on the outgoing I/F is chosen */
  205                 /* space for 16 counters */
  206 #define IP6_STAT_SOURCES_OTHERIF 334    /* number of times that an address on
  207                                            a non-outgoing I/F is chosen */
  208                 /* space for 16 counters */
  209 #define IP6_STAT_SOURCES_SAMESCOPE 350  /* number of times that an address that
  210                                            has the same scope from the dest.
  211                                            is chosen */
  212                 /* space for 16 counters */
  213 #define IP6_STAT_SOURCES_OTHERSCOPE 366 /* number of times that an address that
  214                                            has a different scope from the dest.
  215                                            is chosen */
  216                 /* space for 16 counters */
  217 #define IP6_STAT_SOURCES_DEPRECATED 382 /* number of times that a deprecated
  218                                            address is chosen */
  219                 /* space for 16 counters */
  220 #define IP6_STAT_FORWARD_CACHEHIT 398
  221 #define IP6_STAT_FORWARD_CACHEMISS 399
  222 #define IP6_STAT_FASTFORWARD    400     /* packets fast forwarded */
  223 #define IP6_STAT_FASTFORWARDFLOWS 401   /* number of fast forward flows */
  224 
  225 #define IP6_NSTATS              402
  226 
  227 #define IP6FLOW_HASHBITS         6 /* should not be a multiple of 8 */
  228 
  229 /* 
  230  * Structure for an IPv6 flow (ip6_fastforward).
  231  */
  232 struct ip6flow {
  233         LIST_ENTRY(ip6flow) ip6f_list;  /* next in active list */
  234         LIST_ENTRY(ip6flow) ip6f_hash;  /* next ip6flow in bucket */
  235         struct in6_addr ip6f_dst;       /* destination address */
  236         struct in6_addr ip6f_src;       /* source address */
  237         struct route ip6f_ro;       /* associated route entry */
  238         u_int32_t ip6f_flow;            /* flow (tos) */
  239         u_quad_t ip6f_uses;               /* number of uses in this period */
  240         u_quad_t ip6f_last_uses;          /* number of uses in last period */
  241         u_quad_t ip6f_dropped;            /* ENOBUFS returned by if_output */
  242         u_quad_t ip6f_forwarded;          /* packets forwarded */
  243         u_int ip6f_timer;               /* lifetime timer */
  244         time_t ip6f_start;              /* creation time */
  245 };
  246 
  247 #ifdef _KERNEL
  248 /*
  249  * Auxiliary attributes of incoming IPv6 packets, which is initialized when we
  250  * come into ip6_input().
  251  * XXX do not make it a kitchen sink!
  252  */
  253 struct ip6aux {
  254         /* ip6.ip6_dst */
  255         struct in6_addr ip6a_src;
  256         uint32_t        ip6a_scope_id;
  257         int             ip6a_flags;
  258 };
  259 
  260 /* flags passed to ip6_output as last parameter */
  261 #define IPV6_UNSPECSRC          0x01    /* allow :: as the source address */
  262 #define IPV6_FORWARDING         0x02    /* most of IPv6 header exists */
  263 #define IPV6_MINMTU             0x04    /* use minimum MTU (IPV6_USE_MIN_MTU) */
  264 
  265 extern u_int32_t ip6_id;                /* fragment identifier */
  266 extern int      ip6_defhlim;            /* default hop limit */
  267 extern int      ip6_defmcasthlim;       /* default multicast hop limit */
  268 extern int      ip6_forwarding;         /* act as router? */
  269 extern int      ip6_sendredirect;       /* send ICMPv6 redirect? */
  270 extern int      ip6_forward_srcrt;      /* forward src-routed? */
  271 extern int      ip6_use_deprecated;     /* allow deprecated addr as source */
  272 extern int      ip6_rr_prune;           /* router renumbering prefix
  273                                          * walk list every 5 sec.    */
  274 extern int      ip6_mcast_pmtu;         /* enable pMTU discovery for multicast? */
  275 extern int      ip6_v6only;
  276 
  277 extern struct socket *ip6_mrouter;      /* multicast routing daemon */
  278 extern int      ip6_sendredirects;      /* send IP redirects when forwarding? */
  279 extern int      ip6_maxfragpackets; /* Maximum packets in reassembly queue */
  280 extern int      ip6_maxfrags;   /* Maximum fragments in reassembly queue */
  281 extern int      ip6_sourcecheck;        /* Verify source interface */
  282 extern int      ip6_sourcecheck_interval; /* Interval between log messages */
  283 extern int      ip6_accept_rtadv;       /* Acts as a host not a router */
  284 extern int      ip6_keepfaith;          /* Firewall Aided Internet Translator */
  285 extern int      ip6_log_interval;
  286 extern time_t   ip6_log_time;
  287 extern int      ip6_hdrnestlimit; /* upper limit of # of extension headers */
  288 extern int      ip6_dad_count;          /* DupAddrDetectionTransmits */
  289 
  290 extern int ip6_auto_flowlabel;
  291 extern int ip6_auto_linklocal;
  292 
  293 extern int   ip6_anonportmin;           /* minimum ephemeral port */
  294 extern int   ip6_anonportmax;           /* maximum ephemeral port */
  295 extern int   ip6_lowportmin;            /* minimum reserved port */
  296 extern int   ip6_lowportmax;            /* maximum reserved port */
  297 
  298 extern int      ip6_use_tempaddr; /* whether to use temporary addresses. */
  299 extern int      ip6_prefer_tempaddr; /* whether to prefer temporary addresses
  300                                         in the source address selection */
  301 extern int      ip6_use_defzone; /* whether to use the default scope zone
  302                                     when unspecified */
  303 
  304 #ifdef GATEWAY
  305 extern int      ip6_maxflows;           /* maximum amount of flows for ip6ff */
  306 extern int      ip6_hashsize;           /* size of hash table */
  307 #endif
  308 
  309 struct in6pcb;
  310 
  311 int     icmp6_ctloutput(int, struct socket *, struct sockopt *);
  312 
  313 void    ip6_init(void);
  314 void    ip6intr(void);
  315 void    ip6_input(struct mbuf *);
  316 const struct ip6aux *ip6_getdstifaddr(struct mbuf *);
  317 void    ip6_freepcbopts(struct ip6_pktopts *);
  318 void    ip6_freemoptions(struct ip6_moptions *);
  319 int     ip6_unknown_opt(u_int8_t *, struct mbuf *, int);
  320 u_int8_t *ip6_get_prevhdr(struct mbuf *, int);
  321 int     ip6_nexthdr(struct mbuf *, int, int, int *);
  322 int     ip6_lasthdr(struct mbuf *, int, int, int *);
  323 
  324 struct m_tag *ip6_addaux(struct mbuf *);
  325 struct m_tag *ip6_findaux(struct mbuf *);
  326 void    ip6_delaux(struct mbuf *);
  327 
  328 int     ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *);
  329 int     ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *,
  330                                  u_int32_t *);
  331 void    ip6_savecontrol(struct in6pcb *, struct mbuf **, struct ip6_hdr *,
  332                 struct mbuf *);
  333 void    ip6_notify_pmtu(struct in6pcb *, const struct sockaddr_in6 *,
  334                 u_int32_t *);
  335 int     ip6_sysctl(int *, u_int, void *, size_t *, void *, size_t);
  336 
  337 void    ip6_forward(struct mbuf *, int);
  338 
  339 void    ip6_mloopback(struct ifnet *, struct mbuf *,
  340                       const struct sockaddr_in6 *);
  341 int     ip6_output(struct mbuf *, struct ip6_pktopts *,
  342                         struct route *, int,
  343                         struct ip6_moptions *, struct socket *,
  344                         struct ifnet **);
  345 int     ip6_ctloutput(int, struct socket *, struct sockopt *);
  346 int     ip6_raw_ctloutput(int, struct socket *, struct sockopt *);
  347 void    ip6_initpktopts(struct ip6_pktopts *);
  348 int     ip6_setpktopts(struct mbuf *, struct ip6_pktopts *,
  349                             struct ip6_pktopts *, kauth_cred_t, int);
  350 void    ip6_clearpktopts(struct ip6_pktopts *, int);
  351 struct ip6_pktopts *ip6_copypktopts(struct ip6_pktopts *, int);
  352 int     ip6_optlen(struct in6pcb *);
  353 
  354 void    ip6_statinc(u_int);
  355 
  356 int     route6_input(struct mbuf **, int *, int);
  357 
  358 void    frag6_init(void);
  359 int     frag6_input(struct mbuf **, int *, int);
  360 void    frag6_slowtimo(void);
  361 void    frag6_fasttimo(void);
  362 void    frag6_drain(void);
  363 void    frag6_drainstub(void);
  364 
  365 int     ip6flow_init(int);
  366 void    ip6flow_poolinit(void);
  367 struct  ip6flow *ip6flow_reap(int);
  368 void    ip6flow_create(const struct route *, struct mbuf *);
  369 void    ip6flow_slowtimo(void);
  370 int     ip6flow_invalidate_all(int);
  371 
  372 void    rip6_init(void);
  373 int     rip6_input(struct mbuf **, int *, int);
  374 void    *rip6_ctlinput(int, const struct sockaddr *, void *);
  375 int     rip6_ctloutput(int, struct socket *, struct sockopt *);
  376 int     rip6_output(struct mbuf *, struct socket *, struct sockaddr_in6 *,
  377                          struct mbuf *);
  378 int     rip6_usrreq(struct socket *,
  379             int, struct mbuf *, struct mbuf *, struct mbuf *, struct lwp *);
  380 
  381 int     dest6_input(struct mbuf **, int *, int);
  382 int     none_input(struct mbuf **, int *, int);
  383 
  384 struct route;
  385 
  386 struct  in6_addr *in6_selectsrc(struct sockaddr_in6 *,
  387         struct ip6_pktopts *, struct ip6_moptions *, struct route *,
  388         struct in6_addr *, struct ifnet **, int *);
  389 int in6_selectroute(struct sockaddr_in6 *, struct ip6_pktopts *,
  390         struct ip6_moptions *, struct route *, struct ifnet **,
  391         struct rtentry **, int);
  392 
  393 u_int32_t ip6_randomid(void);
  394 u_int32_t ip6_randomflowlabel(void);
  395 #endif /* _KERNEL */
  396 
  397 #endif /* !_NETINET6_IP6_VAR_H_ */

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