FreeBSD/Linux Kernel Cross Reference
sys/netinet6/ip6_var.h

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the project nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      $KAME: ip6_var.h,v 1.62 2001/05/03 14:51:48 itojun Exp $
     */
    
    /*-
     * Copyright (c) 1982, 1986, 1993
     *      The Regents of the University of California.  All rights reserved.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)ip_var.h    8.1 (Berkeley) 6/10/93
     * $FreeBSD$
     */
    
    #ifndef _NETINET6_IP6_VAR_H_
    #define _NETINET6_IP6_VAR_H_
    
    #include <sys/epoch.h>
    
    #ifdef _KERNEL
    struct ip6asfrag;               /* frag6.c */
    TAILQ_HEAD(ip6fraghead, ip6asfrag);
    
    /*
     * IP6 reassembly queue structure.  Each fragment
     * being reassembled is attached to one of these structures.
     */
    struct  ip6q {
            struct ip6fraghead ip6q_frags;
            u_int32_t       ip6q_ident;
            u_int8_t        ip6q_nxt;
            u_int8_t        ip6q_ecn;
            u_int8_t        ip6q_ttl;
            struct in6_addr ip6q_src, ip6q_dst;
            TAILQ_ENTRY(ip6q) ip6q_tq;
            int             ip6q_unfrglen;  /* len of unfragmentable part */
            int             ip6q_nfrag;     /* # of fragments */
            struct label    *ip6q_label;
    };
    #endif /* _KERNEL */
    
    /*
     * IP6 reinjecting structure.
     */
    struct ip6_direct_ctx {
            uint32_t        ip6dc_nxt;      /* next header to process */
            uint32_t        ip6dc_off;      /* offset to next header */
    };
   
   #if defined(_NETINET6_IN6_VAR_H_) && defined(_KERNEL)
   /*
    * Structure attached to inpcb.in6p_moptions and
    * passed to ip6_output when IPv6 multicast options are in use.
    * This structure is lazy-allocated.
    */
   struct ip6_moptions {
           struct  ifnet *im6o_multicast_ifp; /* ifp for outgoing multicasts */
           u_char  im6o_multicast_hlim;    /* hoplimit for outgoing multicasts */
           u_char  im6o_multicast_loop;    /* 1 >= hear sends if a member */
           struct ip6_mfilter_head im6o_head; /* group membership list */
   };
   #else
   struct ip6_moptions;
   #endif
   /*
    * Control options for outgoing packets
    */
   
   /* Routing header related info */
   struct  ip6po_rhinfo {
           struct  ip6_rthdr *ip6po_rhi_rthdr; /* Routing header */
           struct  route_in6 ip6po_rhi_route; /* Route to the 1st hop */
   };
   #define ip6po_rthdr     ip6po_rhinfo.ip6po_rhi_rthdr
   #define ip6po_route     ip6po_rhinfo.ip6po_rhi_route
   
   /* Nexthop related info */
   struct  ip6po_nhinfo {
           struct  sockaddr *ip6po_nhi_nexthop;
           struct  route_in6 ip6po_nhi_route; /* Route to the nexthop */
   };
   #define ip6po_nexthop   ip6po_nhinfo.ip6po_nhi_nexthop
   #define ip6po_nextroute ip6po_nhinfo.ip6po_nhi_route
   
   struct  ip6_pktopts {
           struct  mbuf *ip6po_m;  /* Pointer to mbuf storing the data */
           int     ip6po_hlim;     /* Hoplimit for outgoing packets */
   
           /* Outgoing IF/address information */
           struct  in6_pktinfo *ip6po_pktinfo;
   
           /* Next-hop address information */
           struct  ip6po_nhinfo ip6po_nhinfo;
   
           struct  ip6_hbh *ip6po_hbh; /* Hop-by-Hop options header */
   
           /* Destination options header (before a routing header) */
           struct  ip6_dest *ip6po_dest1;
   
           /* Routing header related info. */
           struct  ip6po_rhinfo ip6po_rhinfo;
   
           /* Destination options header (after a routing header) */
           struct  ip6_dest *ip6po_dest2;
   
           int     ip6po_tclass;   /* traffic class */
   
           int     ip6po_minmtu;  /* fragment vs PMTU discovery policy */
   #define IP6PO_MINMTU_MCASTONLY  -1 /* default; send at min MTU for multicast*/
   #define IP6PO_MINMTU_DISABLE     0 /* always perform pmtu disc */
   #define IP6PO_MINMTU_ALL         1 /* always send at min MTU */
   
           int     ip6po_prefer_tempaddr;  /* whether temporary addresses are
                                              preferred as source address */
   #define IP6PO_TEMPADDR_SYSTEM   -1 /* follow the system default */
   #define IP6PO_TEMPADDR_NOTPREFER 0 /* not prefer temporary address */
   #define IP6PO_TEMPADDR_PREFER    1 /* prefer temporary address */
   
           int ip6po_flags;
   #if 0   /* parameters in this block is obsolete. do not reuse the values. */
   #define IP6PO_REACHCONF 0x01    /* upper-layer reachability confirmation. */
   #define IP6PO_MINMTU    0x02    /* use minimum MTU (IPV6_USE_MIN_MTU) */
   #endif
   #define IP6PO_DONTFRAG  0x04    /* disable fragmentation (IPV6_DONTFRAG) */
   #define IP6PO_USECOA    0x08    /* use care of address */
   };
   
   /*
    * Control options for incoming packets
    */
   
   struct  ip6stat {
           uint64_t ip6s_total;            /* total packets received */
           uint64_t ip6s_tooshort;         /* packet too short */
           uint64_t ip6s_toosmall;         /* not enough data */
           uint64_t ip6s_fragments;        /* fragments received */
           uint64_t ip6s_fragdropped;      /* frags dropped(dups, out of space) */
           uint64_t ip6s_fragtimeout;      /* fragments timed out */
           uint64_t ip6s_fragoverflow;     /* fragments that exceeded limit */
           uint64_t ip6s_forward;          /* packets forwarded */
           uint64_t ip6s_cantforward;      /* packets rcvd for unreachable dest */
           uint64_t ip6s_redirectsent;     /* packets forwarded on same net */
           uint64_t ip6s_delivered;        /* datagrams delivered to upper level*/
           uint64_t ip6s_localout;         /* total ip packets generated here */
           uint64_t ip6s_odropped;         /* lost packets due to nobufs, etc. */
           uint64_t ip6s_reassembled;      /* total packets reassembled ok */
           uint64_t ip6s_atomicfrags;      /* atomic fragments */
           uint64_t ip6s_fragmented;       /* datagrams successfully fragmented */
           uint64_t ip6s_ofragments;       /* output fragments created */
           uint64_t ip6s_cantfrag;         /* don't fragment flag was set, etc. */
           uint64_t ip6s_badoptions;       /* error in option processing */
           uint64_t ip6s_noroute;          /* packets discarded due to no route */
           uint64_t ip6s_badvers;          /* ip6 version != 6 */
           uint64_t ip6s_rawout;           /* total raw ip packets generated */
           uint64_t ip6s_badscope;         /* scope error */
           uint64_t ip6s_notmember;        /* don't join this multicast group */
   #define IP6S_HDRCNT             256     /* headers count */
           uint64_t ip6s_nxthist[IP6S_HDRCNT]; /* next header history */
           uint64_t ip6s_m1;               /* one mbuf */
   #define IP6S_M2MMAX             32
           uint64_t ip6s_m2m[IP6S_M2MMAX]; /* two or more mbuf */
           uint64_t ip6s_mext1;            /* one ext mbuf */
           uint64_t ip6s_mext2m;           /* two or more ext mbuf */
           uint64_t ip6s_exthdrtoolong;    /* ext hdr are not contiguous */
           uint64_t ip6s_nogif;            /* no match gif found */
           uint64_t ip6s_toomanyhdr;       /* discarded due to too many headers */
   
           /*
            * statistics for improvement of the source address selection
            * algorithm:
            * XXX: hardcoded 16 = # of ip6 multicast scope types + 1
            */
   #define IP6S_RULESMAX           16
   #define IP6S_SCOPECNT           16
           /* number of times that address selection fails */
           uint64_t ip6s_sources_none;
           /* number of times that an address on the outgoing I/F is chosen */
           uint64_t ip6s_sources_sameif[IP6S_SCOPECNT];
           /* number of times that an address on a non-outgoing I/F is chosen */
           uint64_t ip6s_sources_otherif[IP6S_SCOPECNT];
           /*
            * number of times that an address that has the same scope
            * from the destination is chosen.
            */
           uint64_t ip6s_sources_samescope[IP6S_SCOPECNT];
           /*
            * number of times that an address that has a different scope
            * from the destination is chosen.
            */
           uint64_t ip6s_sources_otherscope[IP6S_SCOPECNT];
           /* number of times that a deprecated address is chosen */
           uint64_t ip6s_sources_deprecated[IP6S_SCOPECNT];
   
           /* number of times that each rule of source selection is applied. */
           uint64_t ip6s_sources_rule[IP6S_RULESMAX];
   };
   
   #ifdef _KERNEL
   #include <sys/counter.h>
   
   VNET_PCPUSTAT_DECLARE(struct ip6stat, ip6stat);
   #define IP6STAT_ADD(name, val)  \
       VNET_PCPUSTAT_ADD(struct ip6stat, ip6stat, name, (val))
   #define IP6STAT_SUB(name, val)  IP6STAT_ADD(name, -(val))
   #define IP6STAT_INC(name)       IP6STAT_ADD(name, 1)
   #define IP6STAT_DEC(name)       IP6STAT_SUB(name, 1)
   #endif
   
   #ifdef _KERNEL
   /* flags passed to ip6_output as last parameter */
   #define IPV6_UNSPECSRC          0x01    /* allow :: as the source address */
   #define IPV6_FORWARDING         0x02    /* most of IPv6 header exists */
   #define IPV6_MINMTU             0x04    /* use minimum MTU (IPV6_USE_MIN_MTU) */
   
   #ifdef __NO_STRICT_ALIGNMENT
   #define IP6_HDR_ALIGNED_P(ip)   1
   #else
   #define IP6_HDR_ALIGNED_P(ip)   ((((intptr_t) (ip)) & 3) == 0)
   #endif
   
   VNET_DECLARE(int, ip6_defhlim);         /* default hop limit */
   VNET_DECLARE(int, ip6_defmcasthlim);    /* default multicast hop limit */
   VNET_DECLARE(int, ip6_forwarding);      /* act as router? */
   VNET_DECLARE(int, ip6_use_deprecated);  /* allow deprecated addr as source */
   VNET_DECLARE(int, ip6_rr_prune);        /* router renumbering prefix
                                            * walk list every 5 sec.    */
   VNET_DECLARE(int, ip6_mcast_pmtu);      /* enable pMTU discovery for multicast? */
   VNET_DECLARE(int, ip6_v6only);
   #define V_ip6_defhlim                   VNET(ip6_defhlim)
   #define V_ip6_defmcasthlim              VNET(ip6_defmcasthlim)
   #define V_ip6_forwarding                VNET(ip6_forwarding)
   #define V_ip6_use_deprecated            VNET(ip6_use_deprecated)
   #define V_ip6_rr_prune                  VNET(ip6_rr_prune)
   #define V_ip6_mcast_pmtu                VNET(ip6_mcast_pmtu)
   #define V_ip6_v6only                    VNET(ip6_v6only)
   
   VNET_DECLARE(struct socket *, ip6_mrouter);     /* multicast routing daemon */
   VNET_DECLARE(int, ip6_sendredirects);   /* send IP redirects when forwarding? */
   VNET_DECLARE(int, ip6_accept_rtadv);    /* Acts as a host not a router */
   VNET_DECLARE(int, ip6_no_radr);         /* No defroute from RA */
   VNET_DECLARE(int, ip6_norbit_raif);     /* Disable R-bit in NA on RA
                                            * receiving IF. */
   VNET_DECLARE(int, ip6_rfc6204w3);       /* Accept defroute from RA even when
                                              forwarding enabled */
   VNET_DECLARE(int, ip6_log_interval);
   VNET_DECLARE(time_t, ip6_log_time);
   VNET_DECLARE(int, ip6_hdrnestlimit);    /* upper limit of # of extension
                                            * headers */
   VNET_DECLARE(int, ip6_dad_count);       /* DupAddrDetectionTransmits */
   #define V_ip6_mrouter                   VNET(ip6_mrouter)
   #define V_ip6_sendredirects             VNET(ip6_sendredirects)
   #define V_ip6_accept_rtadv              VNET(ip6_accept_rtadv)
   #define V_ip6_no_radr                   VNET(ip6_no_radr)
   #define V_ip6_norbit_raif               VNET(ip6_norbit_raif)
   #define V_ip6_rfc6204w3                 VNET(ip6_rfc6204w3)
   #define V_ip6_log_interval              VNET(ip6_log_interval)
   #define V_ip6_log_time                  VNET(ip6_log_time)
   #define V_ip6_hdrnestlimit              VNET(ip6_hdrnestlimit)
   #define V_ip6_dad_count                 VNET(ip6_dad_count)
   
   VNET_DECLARE(int, ip6_auto_flowlabel);
   VNET_DECLARE(int, ip6_auto_linklocal);
   #define V_ip6_auto_flowlabel            VNET(ip6_auto_flowlabel)
   #define V_ip6_auto_linklocal            VNET(ip6_auto_linklocal)
   
   VNET_DECLARE(int, ip6_use_tempaddr);    /* Whether to use temporary addresses */
   VNET_DECLARE(int, ip6_prefer_tempaddr); /* Whether to prefer temporary
                                            * addresses in the source address
                                            * selection */
   #define V_ip6_use_tempaddr              VNET(ip6_use_tempaddr)
   #define V_ip6_prefer_tempaddr           VNET(ip6_prefer_tempaddr)
   
   VNET_DECLARE(int, ip6_use_defzone);     /* Whether to use the default scope
                                            * zone when unspecified */
   #define V_ip6_use_defzone               VNET(ip6_use_defzone)
   
   VNET_DECLARE(struct pfil_head *, inet6_pfil_head);
   #define V_inet6_pfil_head       VNET(inet6_pfil_head)
   #define PFIL_INET6_NAME         "inet6"
   
   #ifdef IPSTEALTH
   VNET_DECLARE(int, ip6stealth);
   #define V_ip6stealth                    VNET(ip6stealth)
   #endif
   
   #ifdef EXPERIMENTAL
   VNET_DECLARE(int, nd6_ignore_ipv6_only_ra);
   #define V_nd6_ignore_ipv6_only_ra       VNET(nd6_ignore_ipv6_only_ra)
   #endif
   
   extern struct   pr_usrreqs rip6_usrreqs;
   struct sockopt;
   
   struct inpcb;
   
   int     icmp6_ctloutput(struct socket *, struct sockopt *sopt);
   
   struct in6_ifaddr;
   void    ip6_init(void);
   int     ip6proto_register(short);
   int     ip6proto_unregister(short);
   
   void    ip6_input(struct mbuf *);
   void    ip6_direct_input(struct mbuf *);
   void    ip6_freepcbopts(struct ip6_pktopts *);
   
   int     ip6_unknown_opt(u_int8_t *, struct mbuf *, int);
   int     ip6_get_prevhdr(const struct mbuf *, int);
   int     ip6_nexthdr(const struct mbuf *, int, int, int *);
   int     ip6_lasthdr(const struct mbuf *, int, int, int *);
   
   extern int      (*ip6_mforward)(struct ip6_hdr *, struct ifnet *,
       struct mbuf *);
   
   int     ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *,
                                    u_int32_t *);
   struct mbuf     **ip6_savecontrol_v4(struct inpcb *, struct mbuf *,
               struct mbuf **, int *);
   void    ip6_savecontrol(struct inpcb *, struct mbuf *, struct mbuf **);
   void    ip6_notify_pmtu(struct inpcb *, struct sockaddr_in6 *, u_int32_t);
   int     ip6_sysctl(int *, u_int, void *, size_t *, void *, size_t);
   
   void    ip6_forward(struct mbuf *, int);
   
   void    ip6_mloopback(struct ifnet *, struct mbuf *);
   int     ip6_output(struct mbuf *, struct ip6_pktopts *,
                           struct route_in6 *,
                           int,
                           struct ip6_moptions *, struct ifnet **,
                           struct inpcb *);
   int     ip6_ctloutput(struct socket *, struct sockopt *);
   int     ip6_raw_ctloutput(struct socket *, struct sockopt *);
   void    ip6_initpktopts(struct ip6_pktopts *);
   int     ip6_setpktopts(struct mbuf *, struct ip6_pktopts *,
           struct ip6_pktopts *, struct ucred *, int);
   void    ip6_clearpktopts(struct ip6_pktopts *, int);
   struct ip6_pktopts *ip6_copypktopts(struct ip6_pktopts *, int);
   int     ip6_optlen(struct inpcb *);
   int     ip6_deletefraghdr(struct mbuf *, int, int);
   int     ip6_fragment(struct ifnet *, struct mbuf *, int, u_char, int,
                           uint32_t);
   
   int     route6_input(struct mbuf **, int *, int);
   
   void    frag6_init(void);
   void    frag6_destroy(void);
   int     frag6_input(struct mbuf **, int *, int);
   void    frag6_slowtimo(void);
   void    frag6_drain(void);
   
   void    rip6_init(void);
   int     rip6_input(struct mbuf **, int *, int);
   void    rip6_ctlinput(int, struct sockaddr *, void *);
   int     rip6_ctloutput(struct socket *, struct sockopt *);
   int     rip6_output(struct mbuf *, struct socket *, ...);
   int     rip6_usrreq(struct socket *,
               int, struct mbuf *, struct mbuf *, struct mbuf *, struct thread *);
   
   int     dest6_input(struct mbuf **, int *, int);
   int     none_input(struct mbuf **, int *, int);
   
   int     in6_selectsrc_socket(struct sockaddr_in6 *, struct ip6_pktopts *,
       struct inpcb *, struct ucred *, int, struct in6_addr *, int *);
   int     in6_selectsrc_addr(uint32_t, const struct in6_addr *,
       uint32_t, struct ifnet *, struct in6_addr *, int *);
   int in6_selectroute(struct sockaddr_in6 *, struct ip6_pktopts *,
           struct ip6_moptions *, struct route_in6 *, struct ifnet **,
           struct nhop_object **, u_int, uint32_t);
   u_int32_t ip6_randomid(void);
   u_int32_t ip6_randomflowlabel(void);
   void in6_delayed_cksum(struct mbuf *m, uint32_t plen, u_short offset);
   #endif /* _KERNEL */
   
   #endif /* !_NETINET6_IP6_VAR_H_ */

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