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 1.93 2022/10/28 05:18:39 ozaki-r 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/types.h>
   68 #include <sys/queue.h>
   69 #include <sys/socketvar.h>
   70 
   71 #include <net/if.h>
   72 #include <net/route.h>
   73 
   74 #include <netinet/in.h>
   75 #include <netinet/ip6.h>
   76 
   77 struct  ip6_moptions {
   78         if_index_t im6o_multicast_if_index; /* I/F for outgoing multicasts */
   79         u_char  im6o_multicast_hlim;    /* hoplimit for outgoing multicasts */
   80         u_char  im6o_multicast_loop;    /* 1 >= hear sends if a member */
   81         LIST_HEAD(, in6_multi_mship) im6o_memberships;
   82 };
   83 
   84 /*
   85  * Control options for outgoing packets
   86  */
   87 
   88 /* Routing header related info */
   89 struct  ip6po_rhinfo {
   90         struct  ip6_rthdr *ip6po_rhi_rthdr; /* Routing header */
   91         struct  route ip6po_rhi_route; /* Route to the 1st hop */
   92 };
   93 #define ip6po_rthdr     ip6po_rhinfo.ip6po_rhi_rthdr
   94 #define ip6po_route     ip6po_rhinfo.ip6po_rhi_route
   95 
   96 /* Nexthop related info */
   97 struct  ip6po_nhinfo {
   98         struct  sockaddr *ip6po_nhi_nexthop;
   99         struct  route ip6po_nhi_route; /* Route to the nexthop */
  100 };
  101 #define ip6po_nexthop   ip6po_nhinfo.ip6po_nhi_nexthop
  102 #define ip6po_nextroute ip6po_nhinfo.ip6po_nhi_route
  103 
  104 struct  ip6_pktopts {
  105         int     ip6po_hlim;             /* Hoplimit for outgoing packets */
  106         struct  in6_pktinfo *ip6po_pktinfo; /* Outgoing IF/address information */
  107         struct  ip6po_nhinfo ip6po_nhinfo; /* Next-hop address information */
  108         struct  ip6_hbh *ip6po_hbh; /* Hop-by-Hop options header */
  109         struct  ip6_dest *ip6po_dest1; /* Destination options header(1st part) */
  110         struct  ip6po_rhinfo ip6po_rhinfo; /* Routing header related info. */
  111         struct  ip6_dest *ip6po_dest2; /* Destination options header(2nd part) */
  112         int     ip6po_tclass;   /* traffic class */
  113         int     ip6po_minmtu;  /* fragment vs PMTU discovery policy */
  114 #define IP6PO_MINMTU_MCASTONLY  -1 /* default; send at min MTU for multicast*/
  115 #define IP6PO_MINMTU_DISABLE     0 /* always perform pmtu disc */
  116 #define IP6PO_MINMTU_ALL         1 /* always send at min MTU */
  117         int     ip6po_prefer_tempaddr;  /* whether temporary addresses are
  118                                          * preferred as source address */
  119 #define IP6PO_TEMPADDR_SYSTEM   -1 /* follow the system default */
  120 #define IP6PO_TEMPADDR_NOTPREFER 0 /* not prefer temporary address */
  121 #define IP6PO_TEMPADDR_PREFER    1 /* prefer temporary address */
  122         int ip6po_flags;
  123 #if 0   /* parameters in this block is obsolete. do not reuse the values. */
  124 #define IP6PO_REACHCONF 0x01    /* upper-layer reachability confirmation. */
  125 #define IP6PO_MINMTU    0x02    /* use minimum MTU (IPV6_USE_MIN_MTU) */
  126 #endif
  127 #define IP6PO_DONTFRAG  0x04    /* disable fragmentation (IPV6_DONTFRAG) */
  128 };
  129 
  130 /*
  131  * IPv6 statistics.
  132  * Each counter is an unsigned 64-bit value.
  133  */
  134 #define IP6_STAT_TOTAL          0       /* total packets received */
  135 #define IP6_STAT_TOOSHORT       1       /* packet too short */
  136 #define IP6_STAT_TOOSMALL       2       /* not enough data */
  137 #define IP6_STAT_FRAGMENTS      3       /* fragments received */
  138 #define IP6_STAT_FRAGDROPPED    4       /* frags dropped (dups, out of space) */
  139 #define IP6_STAT_FRAGTIMEOUT    5       /* fragments timed out */
  140 #define IP6_STAT_FRAGOVERFLOW   6       /* fragments that exceed limit */
  141 #define IP6_STAT_FORWARD        7       /* packets forwarded */
  142 #define IP6_STAT_CANTFORWARD    8       /* packets rcvd for uncreachable dst */
  143 #define IP6_STAT_REDIRECTSENT   9       /* packets forwarded on same net */
  144 #define IP6_STAT_DELIVERED      10      /* datagrams delivered to upper level */
  145 #define IP6_STAT_LOCALOUT       11      /* total IP packets generated here */
  146 #define IP6_STAT_ODROPPED       12      /* lost packets due to nobufs, etc. */
  147 #define IP6_STAT_REASSEMBLED    13      /* total packets reassembled ok */
  148 #define IP6_STAT_FRAGMENTED     14      /* datagrams successfully fragmented */
  149 #define IP6_STAT_OFRAGMENTS     15      /* output fragments created */
  150 #define IP6_STAT_CANTFRAG       16      /* don't fragment flag was set, etc. */
  151 #define IP6_STAT_BADOPTIONS     17      /* error in option processing */
  152 #define IP6_STAT_NOROUTE        18      /* packets discarded due to no route */
  153 #define IP6_STAT_BADVERS        19      /* ip6 version != 6 */
  154 #define IP6_STAT_RAWOUT         20      /* total raw ip packets generated */
  155 #define IP6_STAT_BADSCOPE       21      /* scope error */
  156 #define IP6_STAT_NOTMEMBER      22      /* don't join this multicast group */
  157 #define IP6_STAT_NXTHIST        23      /* next header histogram */
  158                 /* space for 256 counters */
  159 #define IP6_STAT_M1             279     /* one mbuf */
  160 #define IP6_STAT_M2M            280     /* two or more mbuf */
  161                 /* space for 32 counters */
  162 #define IP6_STAT_MEXT1          312     /* one ext mbuf */
  163 #define IP6_STAT_MEXT2M         313     /* two or more ext mbuf */
  164 #define IP6_STAT_EXTHDRTOOLONG  314     /* ext hdr are not contiguous */
  165 #define IP6_STAT_NOGIF          315     /* no match gif found */
  166 #define IP6_STAT_TOOMANYHDR     316     /* discarded due to too many headers */
  167         /*
  168          * statistics for improvement of the source address selection
  169          * algorithm:
  170          * XXX: hardcoded 16 = # of ip6 multicast scope types + 1
  171          */
  172 #define IP6_STAT_SOURCES_NONE   317     /* number of times that address
  173                                            selection fails */
  174 #define IP6_STAT_SOURCES_SAMEIF 318     /* number of times that an address
  175                                            on the outgoing I/F is chosen */
  176                 /* space for 16 counters */
  177 #define IP6_STAT_SOURCES_OTHERIF 334    /* number of times that an address on
  178                                            a non-outgoing I/F is chosen */
  179                 /* space for 16 counters */
  180 #define IP6_STAT_SOURCES_SAMESCOPE 350  /* number of times that an address that
  181                                            has the same scope from the dest.
  182                                            is chosen */
  183                 /* space for 16 counters */
  184 #define IP6_STAT_SOURCES_OTHERSCOPE 366 /* number of times that an address that
  185                                            has a different scope from the dest.
  186                                            is chosen */
  187                 /* space for 16 counters */
  188 #define IP6_STAT_SOURCES_DEPRECATED 382 /* number of times that a deprecated
  189                                            address is chosen */
  190                 /* space for 16 counters */
  191 #define IP6_STAT_FORWARD_CACHEHIT 398
  192 #define IP6_STAT_FORWARD_CACHEMISS 399
  193 #define IP6_STAT_FASTFORWARD    400     /* packets fast forwarded */
  194 #define IP6_STAT_FASTFORWARDFLOWS 401   /* number of fast forward flows */
  195 #define IP6_STAT_NOIPSEC        402     /* no match ipsec(4) found */
  196 #define IP6_STAT_PFILDROP_IN    403     /* dropped by pfil (PFIL_IN) */
  197 #define IP6_STAT_PFILDROP_OUT   404     /* dropped by pfil (PFIL_OUT) */
  198 #define IP6_STAT_IPSECDROP_IN   405     /* dropped by IPsec SP check */
  199 #define IP6_STAT_IPSECDROP_OUT  406     /* dropped by IPsec SP check */
  200 #define IP6_STAT_IFDROP         407     /* dropped due to interface state */
  201 #define IP6_STAT_IDROPPED       408     /* lost packets due to nobufs, etc. */
  202 #define IP6_STAT_TIMXCEED       409     /* hop limit exceeded */
  203 #define IP6_STAT_TOOBIG         410     /* packet bigger than MTU */
  204 #define IP6_STAT_RTREJECT       411     /* rejected by route */
  205 
  206 #define IP6_NSTATS              412
  207 
  208 #define IP6FLOW_HASHBITS         6 /* should not be a multiple of 8 */
  209 
  210 /* 
  211  * Structure for an IPv6 flow (ip6_fastforward).
  212  */
  213 struct ip6flow {
  214         TAILQ_ENTRY(ip6flow) ip6f_list;  /* next in active list */
  215         TAILQ_ENTRY(ip6flow) ip6f_hash;  /* next ip6flow in bucket */
  216         size_t ip6f_hashidx;             /* own hash index of ipflowtable[] */
  217         struct in6_addr ip6f_dst;       /* destination address */
  218         struct in6_addr ip6f_src;       /* source address */
  219         struct route ip6f_ro;       /* associated route entry */
  220         u_int32_t ip6f_flow;            /* flow (tos) */
  221         u_quad_t ip6f_uses;               /* number of uses in this period */
  222         u_quad_t ip6f_last_uses;          /* number of uses in last period */
  223         u_quad_t ip6f_dropped;            /* ENOBUFS returned by if_output */
  224         u_quad_t ip6f_forwarded;          /* packets forwarded */
  225         u_int ip6f_timer;               /* lifetime timer */
  226 };
  227 
  228 #ifdef _KERNEL
  229 
  230 #include <sys/protosw.h>
  231 #include <sys/cprng.h>
  232 
  233 /*
  234  * Auxiliary attributes of incoming IPv6 packets, which is initialized when we
  235  * come into ip6_input().
  236  * XXX do not make it a kitchen sink!
  237  */
  238 struct ip6aux {
  239         /* ip6.ip6_dst */
  240         struct in6_addr ip6a_src;
  241         uint32_t        ip6a_scope_id;
  242         int             ip6a_flags;
  243 };
  244 
  245 /* flags passed to ip6_output as last parameter */
  246 #define IPV6_UNSPECSRC          0x01    /* allow :: as the source address */
  247 #define IPV6_FORWARDING         0x02    /* most of IPv6 header exists */
  248 #define IPV6_MINMTU             0x04    /* use minimum MTU (IPV6_USE_MIN_MTU) */
  249 
  250 extern u_int32_t ip6_id;                /* fragment identifier */
  251 extern int      ip6_defhlim;            /* default hop limit */
  252 extern int      ip6_defmcasthlim;       /* default multicast hop limit */
  253 extern int      ip6_forwarding;         /* act as router? */
  254 extern int      ip6_sendredirect;       /* send ICMPv6 redirect? */
  255 extern int      ip6_use_deprecated;     /* allow deprecated addr as source */
  256 extern int      ip6_mcast_pmtu;         /* enable pMTU discovery for multicast? */
  257 extern int      ip6_v6only;
  258 extern int      ip6_neighborgcthresh;   /* Threshold # of NDP entries for GC */
  259 extern int      ip6_maxdynroutes; /* Max # of routes created via redirect */
  260 extern int      ip6_param_rt_msg;  /* How to send parmeter changing rtm */
  261 
  262 
  263 extern struct socket *ip6_mrouter;      /* multicast routing daemon */
  264 extern int      ip6_sendredirects;      /* send IP redirects when forwarding? */
  265 extern int      ip6_maxfragpackets; /* Maximum packets in reassembly queue */
  266 extern int      ip6_maxfrags;   /* Maximum fragments in reassembly queue */
  267 extern int      ip6_keepfaith;          /* Firewall Aided Internet Translator */
  268 extern int      ip6_log_interval;
  269 extern time_t   ip6_log_time;
  270 extern int      ip6_hdrnestlimit; /* upper limit of # of extension headers */
  271 extern int      ip6_dad_count;          /* DupAddrDetectionTransmits */
  272 
  273 extern int ip6_auto_flowlabel;
  274 extern int ip6_auto_linklocal;
  275 
  276 extern int   ip6_anonportmin;           /* minimum ephemeral port */
  277 extern int   ip6_anonportmax;           /* maximum ephemeral port */
  278 extern int   ip6_lowportmin;            /* minimum reserved port */
  279 extern int   ip6_lowportmax;            /* maximum reserved port */
  280 
  281 extern int      ip6_prefer_tempaddr; /* whether to prefer temporary addresses
  282                                         in the source address selection */
  283 extern int      ip6_use_defzone; /* whether to use the default scope zone
  284                                     when unspecified */
  285 
  286 #ifdef GATEWAY
  287 extern int      ip6_maxflows;           /* maximum amount of flows for ip6ff */
  288 extern int      ip6_hashsize;           /* size of hash table */
  289 #endif
  290 
  291 struct inpcb;
  292 extern const struct pr_usrreqs rip6_usrreqs;
  293 
  294 int     icmp6_ctloutput(int, struct socket *, struct sockopt *);
  295 
  296 struct mbuf;
  297 void    ip6_init(void);
  298 const struct ip6aux *ip6_getdstifaddr(struct mbuf *);
  299 void    ip6_freepcbopts(struct ip6_pktopts *);
  300 void    ip6_freemoptions(struct ip6_moptions *);
  301 int     ip6_unknown_opt(u_int8_t *, struct mbuf *, int);
  302 int     ip6_get_prevhdr(struct mbuf *, int);
  303 int     ip6_nexthdr(struct mbuf *, int, int, int *);
  304 int     ip6_lasthdr(struct mbuf *, int, int, int *);
  305 
  306 struct ip6_hdr;
  307 int     ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *);
  308 int     ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *);
  309 void    ip6_savecontrol(struct inpcb *, struct mbuf **, struct ip6_hdr *,
  310                 struct mbuf *);
  311 void    ip6_notify_pmtu(struct inpcb *, const struct sockaddr_in6 *,
  312                 u_int32_t *);
  313 int     ip6_sysctl(int *, u_int, void *, size_t *, void *, size_t);
  314 
  315 void    ip6_forward(struct mbuf *, int, struct ifnet *);
  316 
  317 void    ip6_mloopback(struct ifnet *, struct mbuf *,
  318                       const struct sockaddr_in6 *);
  319 int     ip6_output(struct mbuf *, struct ip6_pktopts *, struct route *, int,
  320             struct ip6_moptions *, struct inpcb *, struct ifnet **);
  321 int     ip6_if_output(struct ifnet * const, struct ifnet * const,
  322             struct mbuf * const,
  323             const struct sockaddr_in6 * const, const struct rtentry *);
  324 int     ip6_ctloutput(int, struct socket *, struct sockopt *);
  325 int     ip6_raw_ctloutput(int, struct socket *, struct sockopt *);
  326 void    ip6_initpktopts(struct ip6_pktopts *);
  327 int     ip6_setpktopts(struct mbuf *, struct ip6_pktopts *,
  328                             struct ip6_pktopts *, kauth_cred_t, int);
  329 void    ip6_clearpktopts(struct ip6_pktopts *, int);
  330 struct ip6_pktopts *ip6_copypktopts(struct ip6_pktopts *, int);
  331 int     ip6_optlen(struct inpcb *);
  332 
  333 void    ip6_statinc(u_int);
  334 
  335 int     route6_input(struct mbuf **, int *, int);
  336 
  337 void    frag6_init(void);
  338 int     frag6_input(struct mbuf **, int *, int);
  339 int     ip6_reass_packet(struct mbuf **, int);
  340 void    frag6_slowtimo(void);
  341 void    frag6_fasttimo(void);
  342 void    frag6_drain(void);
  343 void    frag6_drainstub(void);
  344 
  345 int     ip6flow_init(int);
  346 void    ip6flow_poolinit(void);
  347 struct  ip6flow *ip6flow_reap(int);
  348 void    ip6flow_create(struct route *, struct mbuf *);
  349 void    ip6flow_slowtimo(void);
  350 int     ip6flow_invalidate_all(int);
  351 
  352 void    rip6_init(void);
  353 int     rip6_input(struct mbuf **, int *, int);
  354 void    *rip6_ctlinput(int, const struct sockaddr *, void *);
  355 int     rip6_ctloutput(int, struct socket *, struct sockopt *);
  356 int     rip6_output(struct mbuf *, struct socket *, struct sockaddr_in6 *,
  357                          struct mbuf *);
  358 int     rip6_attach(struct socket *, int);
  359 int     rip6_usrreq(struct socket *,
  360             int, struct mbuf *, struct mbuf *, struct mbuf *, struct lwp *);
  361 
  362 int     dest6_input(struct mbuf **, int *, int);
  363 int     none_input(struct mbuf **, int *, int);
  364 
  365 struct route;
  366 
  367 int     in6_selectsrc(struct sockaddr_in6 *, struct ip6_pktopts *,
  368            struct ip6_moptions *, struct route *, struct in6_addr *,
  369            struct ifnet **, struct psref *, struct in6_addr *);
  370 int in6_selectroute(struct sockaddr_in6 *, struct ip6_pktopts *,
  371         struct route **, struct rtentry **, bool);
  372 int     ip6_get_membership(const struct sockopt *, struct ifnet **,
  373             struct psref *, void *, size_t);
  374 
  375 static __inline uint32_t
  376 ip6_randomid(void)
  377 {
  378 
  379         return cprng_fast32();
  380 }
  381 
  382 static __inline uint32_t
  383 ip6_randomflowlabel(void)
  384 {
  385 
  386         return cprng_fast32() & 0xfffff;
  387 }
  388 
  389 static __inline bool
  390 ip6_dad_enabled(void)
  391 {
  392 
  393         return ip6_dad_count > 0;
  394 }
  395 #endif /* _KERNEL */
  396 
  397 #endif /* !_NETINET6_IP6_VAR_H_ */

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