/*      $NetBSD: ip6_var.h,v 1.94 2024/02/09 22:08:37 andvar Exp $      */
/*      $KAME: ip6_var.h,v 1.33 2000/06/11 14:59:20 jinmei Exp $        */

/*
* 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.
*/

/*
* 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
*/

#ifndef _NETINET6_IP6_VAR_H_
#define _NETINET6_IP6_VAR_H_

#include <sys/types.h>
#include <sys/queue.h>
#include <sys/socketvar.h>

#include <net/if.h>
#include <net/route.h>

#include <netinet/in.h>
#include <netinet/ip6.h>

struct  ip6_moptions {
       if_index_t im6o_multicast_if_index; /* I/F for outgoing multicasts */
       u_char  im6o_multicast_hlim;    /* hoplimit for outgoing multicasts */
       u_char  im6o_multicast_loop;    /* 1 >= hear sends if a member */
       LIST_HEAD(, in6_multi_mship) im6o_memberships;
};

/*
* Control options for outgoing packets
*/

/* Routing header related info */
struct  ip6po_rhinfo {
       struct  ip6_rthdr *ip6po_rhi_rthdr; /* Routing header */
       struct  route 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 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 {
       int     ip6po_hlim;             /* Hoplimit for outgoing packets */
       struct  in6_pktinfo *ip6po_pktinfo; /* Outgoing IF/address information */
       struct  ip6po_nhinfo ip6po_nhinfo; /* Next-hop address information */
       struct  ip6_hbh *ip6po_hbh; /* Hop-by-Hop options header */
       struct  ip6_dest *ip6po_dest1; /* Destination options header(1st part) */
       struct  ip6po_rhinfo ip6po_rhinfo; /* Routing header related info. */
       struct  ip6_dest *ip6po_dest2; /* Destination options header(2nd part) */
       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) */
};

/*
* IPv6 statistics.
* Each counter is an unsigned 64-bit value.
*/
#define IP6_STAT_TOTAL          0       /* total packets received */
#define IP6_STAT_TOOSHORT       1       /* packet too short */
#define IP6_STAT_TOOSMALL       2       /* not enough data */
#define IP6_STAT_FRAGMENTS      3       /* fragments received */
#define IP6_STAT_FRAGDROPPED    4       /* frags dropped (dups, out of space) */
#define IP6_STAT_FRAGTIMEOUT    5       /* fragments timed out */
#define IP6_STAT_FRAGOVERFLOW   6       /* fragments that exceed limit */
#define IP6_STAT_FORWARD        7       /* packets forwarded */
#define IP6_STAT_CANTFORWARD    8       /* packets rcvd for uncreachable dst */
#define IP6_STAT_REDIRECTSENT   9       /* packets forwarded on same net */
#define IP6_STAT_DELIVERED      10      /* datagrams delivered to upper level */
#define IP6_STAT_LOCALOUT       11      /* total IP packets generated here */
#define IP6_STAT_ODROPPED       12      /* lost packets due to nobufs, etc. */
#define IP6_STAT_REASSEMBLED    13      /* total packets reassembled ok */
#define IP6_STAT_FRAGMENTED     14      /* datagrams successfully fragmented */
#define IP6_STAT_OFRAGMENTS     15      /* output fragments created */
#define IP6_STAT_CANTFRAG       16      /* don't fragment flag was set, etc. */
#define IP6_STAT_BADOPTIONS     17      /* error in option processing */
#define IP6_STAT_NOROUTE        18      /* packets discarded due to no route */
#define IP6_STAT_BADVERS        19      /* ip6 version != 6 */
#define IP6_STAT_RAWOUT         20      /* total raw ip packets generated */
#define IP6_STAT_BADSCOPE       21      /* scope error */
#define IP6_STAT_NOTMEMBER      22      /* don't join this multicast group */
#define IP6_STAT_NXTHIST        23      /* next header histogram */
               /* space for 256 counters */
#define IP6_STAT_M1             279     /* one mbuf */
#define IP6_STAT_M2M            280     /* two or more mbuf */
               /* space for 32 counters */
#define IP6_STAT_MEXT1          312     /* one ext mbuf */
#define IP6_STAT_MEXT2M         313     /* two or more ext mbuf */
#define IP6_STAT_EXTHDRTOOLONG  314     /* ext hdr are not contiguous */
#define IP6_STAT_NOGIF          315     /* no match gif found */
#define IP6_STAT_TOOMANYHDR     316     /* 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 IP6_STAT_SOURCES_NONE   317     /* number of times that address
                                          selection fails */
#define IP6_STAT_SOURCES_SAMEIF 318     /* number of times that an address
                                          on the outgoing I/F is chosen */
               /* space for 16 counters */
#define IP6_STAT_SOURCES_OTHERIF 334    /* number of times that an address on
                                          a non-outgoing I/F is chosen */
               /* space for 16 counters */
#define IP6_STAT_SOURCES_SAMESCOPE 350  /* number of times that an address that
                                          has the same scope from the dest.
                                          is chosen */
               /* space for 16 counters */
#define IP6_STAT_SOURCES_OTHERSCOPE 366 /* number of times that an address that
                                          has a different scope from the dest.
                                          is chosen */
               /* space for 16 counters */
#define IP6_STAT_SOURCES_DEPRECATED 382 /* number of times that a deprecated
                                          address is chosen */
               /* space for 16 counters */
#define IP6_STAT_FORWARD_CACHEHIT 398
#define IP6_STAT_FORWARD_CACHEMISS 399
#define IP6_STAT_FASTFORWARD    400     /* packets fast forwarded */
#define IP6_STAT_FASTFORWARDFLOWS 401   /* number of fast forward flows */
#define IP6_STAT_NOIPSEC        402     /* no match ipsec(4) found */
#define IP6_STAT_PFILDROP_IN    403     /* dropped by pfil (PFIL_IN) */
#define IP6_STAT_PFILDROP_OUT   404     /* dropped by pfil (PFIL_OUT) */
#define IP6_STAT_IPSECDROP_IN   405     /* dropped by IPsec SP check */
#define IP6_STAT_IPSECDROP_OUT  406     /* dropped by IPsec SP check */
#define IP6_STAT_IFDROP         407     /* dropped due to interface state */
#define IP6_STAT_IDROPPED       408     /* lost packets due to nobufs, etc. */
#define IP6_STAT_TIMXCEED       409     /* hop limit exceeded */
#define IP6_STAT_TOOBIG         410     /* packet bigger than MTU */
#define IP6_STAT_RTREJECT       411     /* rejected by route */

#define IP6_NSTATS              412

#define IP6FLOW_HASHBITS         6 /* should not be a multiple of 8 */

/*
* Structure for an IPv6 flow (ip6_fastforward).
*/
struct ip6flow {
       TAILQ_ENTRY(ip6flow) ip6f_list;  /* next in active list */
       TAILQ_ENTRY(ip6flow) ip6f_hash;  /* next ip6flow in bucket */
       size_t ip6f_hashidx;             /* own hash index of ipflowtable[] */
       struct in6_addr ip6f_dst;       /* destination address */
       struct in6_addr ip6f_src;       /* source address */
       struct route ip6f_ro;       /* associated route entry */
       u_int32_t ip6f_flow;            /* flow (tos) */
       u_quad_t ip6f_uses;               /* number of uses in this period */
       u_quad_t ip6f_last_uses;          /* number of uses in last period */
       u_quad_t ip6f_dropped;            /* ENOBUFS returned by if_output */
       u_quad_t ip6f_forwarded;          /* packets forwarded */
       u_int ip6f_timer;               /* lifetime timer */
};

#ifdef _KERNEL

#include <sys/protosw.h>
#include <sys/cprng.h>

/*
* Auxiliary attributes of incoming IPv6 packets, which is initialized when we
* come into ip6_input().
* XXX do not make it a kitchen sink!
*/
struct ip6aux {
       /* ip6.ip6_dst */
       struct in6_addr ip6a_src;
       uint32_t        ip6a_scope_id;
       int             ip6a_flags;
};

/* 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) */

extern u_int32_t ip6_id;                /* fragment identifier */
extern int      ip6_defhlim;            /* default hop limit */
extern int      ip6_defmcasthlim;       /* default multicast hop limit */
extern int      ip6_forwarding;         /* act as router? */
extern int      ip6_sendredirect;       /* send ICMPv6 redirect? */
extern int      ip6_use_deprecated;     /* allow deprecated addr as source */
extern int      ip6_mcast_pmtu;         /* enable pMTU discovery for multicast? */
extern int      ip6_v6only;
extern int      ip6_neighborgcthresh;   /* Threshold # of NDP entries for GC */
extern int      ip6_maxdynroutes; /* Max # of routes created via redirect */
extern int      ip6_param_rt_msg;  /* How to send parameter changing rtm */


extern struct socket *ip6_mrouter;      /* multicast routing daemon */
extern int      ip6_sendredirects;      /* send IP redirects when forwarding? */
extern int      ip6_maxfragpackets; /* Maximum packets in reassembly queue */
extern int      ip6_maxfrags;   /* Maximum fragments in reassembly queue */
extern int      ip6_keepfaith;          /* Firewall Aided Internet Translator */
extern int      ip6_log_interval;
extern time_t   ip6_log_time;
extern int      ip6_hdrnestlimit; /* upper limit of # of extension headers */
extern int      ip6_dad_count;          /* DupAddrDetectionTransmits */

extern int ip6_auto_flowlabel;
extern int ip6_auto_linklocal;

extern int   ip6_anonportmin;           /* minimum ephemeral port */
extern int   ip6_anonportmax;           /* maximum ephemeral port */
extern int   ip6_lowportmin;            /* minimum reserved port */
extern int   ip6_lowportmax;            /* maximum reserved port */

extern int      ip6_prefer_tempaddr; /* whether to prefer temporary addresses
                                       in the source address selection */
extern int      ip6_use_defzone; /* whether to use the default scope zone
                                   when unspecified */

#ifdef GATEWAY
extern int      ip6_maxflows;           /* maximum amount of flows for ip6ff */
extern int      ip6_hashsize;           /* size of hash table */
#endif

struct inpcb;
extern const struct pr_usrreqs rip6_usrreqs;

int     icmp6_ctloutput(int, struct socket *, struct sockopt *);

struct mbuf;
void    ip6_init(void);
const struct ip6aux *ip6_getdstifaddr(struct mbuf *);
void    ip6_freepcbopts(struct ip6_pktopts *);
void    ip6_freemoptions(struct ip6_moptions *);
int     ip6_unknown_opt(u_int8_t *, struct mbuf *, int);
int     ip6_get_prevhdr(struct mbuf *, int);
int     ip6_nexthdr(struct mbuf *, int, int, int *);
int     ip6_lasthdr(struct mbuf *, int, int, int *);

struct ip6_hdr;
int     ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *);
int     ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *);
void    ip6_savecontrol(struct inpcb *, struct mbuf **, struct ip6_hdr *,
               struct mbuf *);
void    ip6_notify_pmtu(struct inpcb *, const struct sockaddr_in6 *,
               u_int32_t *);
int     ip6_sysctl(int *, u_int, void *, size_t *, void *, size_t);

void    ip6_forward(struct mbuf *, int, struct ifnet *);

void    ip6_mloopback(struct ifnet *, struct mbuf *,
                     const struct sockaddr_in6 *);
int     ip6_output(struct mbuf *, struct ip6_pktopts *, struct route *, int,
           struct ip6_moptions *, struct inpcb *, struct ifnet **);
int     ip6_if_output(struct ifnet * const, struct ifnet * const,
           struct mbuf * const,
           const struct sockaddr_in6 * const, const struct rtentry *);
int     ip6_ctloutput(int, struct socket *, struct sockopt *);
int     ip6_raw_ctloutput(int, struct socket *, struct sockopt *);
void    ip6_initpktopts(struct ip6_pktopts *);
int     ip6_setpktopts(struct mbuf *, struct ip6_pktopts *,
                           struct ip6_pktopts *, kauth_cred_t, int);
void    ip6_clearpktopts(struct ip6_pktopts *, int);
struct ip6_pktopts *ip6_copypktopts(struct ip6_pktopts *, int);
int     ip6_optlen(struct inpcb *);

void    ip6_statinc(u_int);

int     route6_input(struct mbuf **, int *, int);

void    frag6_init(void);
int     frag6_input(struct mbuf **, int *, int);
int     ip6_reass_packet(struct mbuf **, int);
void    frag6_slowtimo(void);
void    frag6_fasttimo(void);
void    frag6_drain(void);
void    frag6_drainstub(void);

int     ip6flow_init(int);
void    ip6flow_poolinit(void);
struct  ip6flow *ip6flow_reap(int);
void    ip6flow_create(struct route *, struct mbuf *);
void    ip6flow_slowtimo(void);
int     ip6flow_invalidate_all(int);

void    rip6_init(void);
int     rip6_input(struct mbuf **, int *, int);
void    *rip6_ctlinput(int, const struct sockaddr *, void *);
int     rip6_ctloutput(int, struct socket *, struct sockopt *);
int     rip6_output(struct mbuf *, struct socket *, struct sockaddr_in6 *,
                        struct mbuf *);
int     rip6_attach(struct socket *, int);
int     rip6_usrreq(struct socket *,
           int, struct mbuf *, struct mbuf *, struct mbuf *, struct lwp *);

int     dest6_input(struct mbuf **, int *, int);
int     none_input(struct mbuf **, int *, int);

struct route;

int     in6_selectsrc(struct sockaddr_in6 *, struct ip6_pktopts *,
          struct ip6_moptions *, struct route *, struct in6_addr *,
          struct ifnet **, struct psref *, struct in6_addr *);
int in6_selectroute(struct sockaddr_in6 *, struct ip6_pktopts *,
       struct route **, struct rtentry **, bool);
int     ip6_get_membership(const struct sockopt *, struct ifnet **,
           struct psref *, void *, size_t);

static __inline uint32_t
ip6_randomid(void)
{

       return cprng_fast32();
}

static __inline uint32_t
ip6_randomflowlabel(void)
{

       return cprng_fast32() & 0xfffff;
}

static __inline bool
ip6_dad_enabled(void)
{

       return ip6_dad_count > 0;
}
#endif /* _KERNEL */

#endif /* !_NETINET6_IP6_VAR_H_ */

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