nd6.h

Go to the documentation of this file.

/*-
 * 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: nd6.h,v 1.76 2001/12/18 02:10:31 itojun Exp $
 * $FreeBSD$
 */
 
#ifndef _NETINET6_ND6_H_
#define _NETINET6_ND6_H_
 
/* see net/route.h, or net/if_inarp.h */
#ifndef RTF_ANNOUNCE
#define RTF_ANNOUNCE    RTF_PROTO2
#endif
 
#include <sys/queue.h>
#include <sys/callout.h>
 
struct llentry;
 
#define ND6_LLINFO_NOSTATE      -2
/*
 * We don't need the WAITDELETE state any more, but we keep the definition
 * in a comment line instead of removing it. This is necessary to avoid
 * unintentionally reusing the value for another purpose, which might
 * affect backward compatibility with old applications.
 * (20000711 jinmei@kame.net)
 */
/* #define ND6_LLINFO_WAITDELETE        -1 */
#define ND6_LLINFO_INCOMPLETE   0
#define ND6_LLINFO_REACHABLE    1
#define ND6_LLINFO_STALE        2
#define ND6_LLINFO_DELAY        3
#define ND6_LLINFO_PROBE        4
 
#define ND6_IS_LLINFO_PROBREACH(n) ((n)->ln_state > ND6_LLINFO_INCOMPLETE)
#define ND6_LLINFO_PERMANENT(n) (((n)->la_expire == 0) && ((n)->ln_state > ND6_LLINFO_INCOMPLETE))
 
struct nd_ifinfo {
        u_int32_t linkmtu;              /* LinkMTU */
        u_int32_t maxmtu;               /* Upper bound of LinkMTU */
        u_int32_t basereachable;        /* BaseReachableTime */
        u_int32_t reachable;            /* Reachable Time */
        u_int32_t retrans;              /* Retrans Timer */
        u_int32_t flags;                /* Flags */
        int recalctm;                   /* BaseReacable re-calculation timer */
        u_int8_t chlim;                 /* CurHopLimit */
        u_int8_t initialized; /* Flag to see the entry is initialized */
        /* the following 3 members are for privacy extension for addrconf */
        u_int8_t randomseed0[8]; /* upper 64 bits of MD5 digest */
        u_int8_t randomseed1[8]; /* lower 64 bits (usually the EUI64 IFID) */
        u_int8_t randomid[8];   /* current random ID */
};
 
#define ND6_IFF_PERFORMNUD      0x1
#define ND6_IFF_ACCEPT_RTADV    0x2
#define ND6_IFF_PREFER_SOURCE   0x4 /* Not used in FreeBSD. */
#define ND6_IFF_IFDISABLED      0x8 /* IPv6 operation is disabled due to
                                     * DAD failure.  (XXX: not ND-specific)
                                     */
#define ND6_IFF_DONT_SET_IFROUTE        0x10
#define ND6_IFF_AUTO_LINKLOCAL  0x20
#define ND6_IFF_NO_RADR         0x40
#define ND6_IFF_NO_PREFER_IFACE 0x80 /* XXX: not related to ND. */
#define ND6_IFF_NO_DAD          0x100
#ifdef EXPERIMENTAL
/* XXX: not related to ND. */
#define ND6_IFF_IPV6_ONLY       0x200 /* draft-ietf-6man-ipv6only-flag */
#define ND6_IFF_IPV6_ONLY_MANUAL        0x400
#define ND6_IFF_IPV6_ONLY_MASK  (ND6_IFF_IPV6_ONLY|ND6_IFF_IPV6_ONLY_MANUAL)
#endif
 
#ifdef _KERNEL
#define ND_IFINFO(ifp) \
        (((struct in6_ifextra *)(ifp)->if_afdata[AF_INET6])->nd_ifinfo)
#define IN6_LINKMTU(ifp) \
        ((ND_IFINFO(ifp)->linkmtu && ND_IFINFO(ifp)->linkmtu < (ifp)->if_mtu) \
            ? ND_IFINFO(ifp)->linkmtu \
            : ((ND_IFINFO(ifp)->maxmtu && ND_IFINFO(ifp)->maxmtu < (ifp)->if_mtu) \
                ? ND_IFINFO(ifp)->maxmtu : (ifp)->if_mtu))
#endif
 
struct in6_nbrinfo {
        char ifname[IFNAMSIZ];  /* if name, e.g. "en0" */
        struct in6_addr addr;   /* IPv6 address of the neighbor */
        long    asked;          /* number of queries already sent for this addr */
        int     isrouter;       /* if it acts as a router */
        int     state;          /* reachability state */
        int     expire;         /* lifetime for NDP state transition */
};
 
/* Sysctls, shared with user space. */
struct  in6_defrouter {
        struct  sockaddr_in6 rtaddr;
        u_char  flags;
        u_short rtlifetime;
        u_long  expire;
        u_short if_index;
};
 
struct in6_prefix {
        struct  sockaddr_in6 prefix;
        struct prf_ra raflags;
        u_char  prefixlen;
        u_char  origin;
        u_int32_t vltime;
        u_int32_t pltime;
        time_t expire;
        u_int32_t flags;
        int refcnt;
        u_short if_index;
        u_short advrtrs; /* number of advertisement routers */
        /* struct sockaddr_in6 advrtr[] */
};
 
#ifdef _KERNEL
struct  in6_ondireq {
        char ifname[IFNAMSIZ];
        struct {
                u_int32_t linkmtu;      /* LinkMTU */
                u_int32_t maxmtu;       /* Upper bound of LinkMTU */
                u_int32_t basereachable; /* BaseReachableTime */
                u_int32_t reachable;    /* Reachable Time */
                u_int32_t retrans;      /* Retrans Timer */
                u_int32_t flags;        /* Flags */
                int recalctm;           /* BaseReacable re-calculation timer */
                u_int8_t chlim;         /* CurHopLimit */
                u_int8_t receivedra;
        } ndi;
};
#endif
 
struct  in6_ndireq {
        char ifname[IFNAMSIZ];
        struct nd_ifinfo ndi;
};
 
struct  in6_ndifreq {
        char ifname[IFNAMSIZ];
        u_long ifindex;
};
 
/* Prefix status */
#define NDPRF_ONLINK            0x1
#define NDPRF_DETACHED          0x2
 
/* protocol constants */
#define MAX_RTR_SOLICITATION_DELAY      1       /* 1sec */
#define RTR_SOLICITATION_INTERVAL       4       /* 4sec */
#define MAX_RTR_SOLICITATIONS           3
 
#define ND6_INFINITE_LIFETIME           0xffffffff
 
#ifdef _KERNEL
/* node constants */
#define MAX_REACHABLE_TIME              3600000 /* msec */
#define REACHABLE_TIME                  30000   /* msec */
#define RETRANS_TIMER                   1000    /* msec */
#define MIN_RANDOM_FACTOR               512     /* 1024 * 0.5 */
#define MAX_RANDOM_FACTOR               1536    /* 1024 * 1.5 */
#define DEF_TEMP_VALID_LIFETIME         604800  /* 1 week */
#define DEF_TEMP_PREFERRED_LIFETIME     86400   /* 1 day */
#define TEMPADDR_REGEN_ADVANCE          5       /* sec */
#define MAX_TEMP_DESYNC_FACTOR          600     /* 10 min */
#define ND_COMPUTE_RTIME(x) \
                (((MIN_RANDOM_FACTOR * (x >> 10)) + (arc4random() & \
                ((MAX_RANDOM_FACTOR - MIN_RANDOM_FACTOR) * (x >> 10)))) /1000)
 
struct nd_defrouter {
        TAILQ_ENTRY(nd_defrouter) dr_entry;
        struct in6_addr rtaddr;
        u_char  raflags;        /* flags on RA message */
        u_short rtlifetime;
        u_long  expire;
        struct ifnet *ifp;
        int     installed;      /* is installed into kernel routing table */
        u_int   refcnt;
};
 
struct nd_prefixctl {
        struct ifnet *ndpr_ifp;
 
        /* prefix */
        struct sockaddr_in6 ndpr_prefix;
        u_char  ndpr_plen;
 
        u_int32_t ndpr_vltime;  /* advertised valid lifetime */
        u_int32_t ndpr_pltime;  /* advertised preferred lifetime */
 
        struct prf_ra ndpr_flags;
};
 
LIST_HEAD(nd_prhead, nd_prefix);
struct nd_prefix {
        struct ifnet *ndpr_ifp;
        LIST_ENTRY(nd_prefix) ndpr_entry;
        struct sockaddr_in6 ndpr_prefix;        /* prefix */
        struct in6_addr ndpr_mask; /* netmask derived from the prefix */
 
        u_int32_t ndpr_vltime;  /* advertised valid lifetime */
        u_int32_t ndpr_pltime;  /* advertised preferred lifetime */
 
        time_t ndpr_expire;     /* expiration time of the prefix */
        time_t ndpr_preferred;  /* preferred time of the prefix */
        time_t ndpr_lastupdate; /* reception time of last advertisement */
 
        struct prf_ra ndpr_flags;
        u_int32_t ndpr_stateflags; /* actual state flags */
        /* list of routers that advertise the prefix: */
        LIST_HEAD(pr_rtrhead, nd_pfxrouter) ndpr_advrtrs;
        u_char  ndpr_plen;
        int     ndpr_addrcnt;   /* count of derived addresses */
        volatile u_int ndpr_refcnt;
};
 
#define ndpr_raf                ndpr_flags
#define ndpr_raf_onlink         ndpr_flags.onlink
#define ndpr_raf_auto           ndpr_flags.autonomous
#define ndpr_raf_router         ndpr_flags.router
 
struct nd_pfxrouter {
        LIST_ENTRY(nd_pfxrouter) pfr_entry;
        struct nd_defrouter *router;
};
 
#ifdef MALLOC_DECLARE
MALLOC_DECLARE(M_IP6NDP);
#endif
 
/* nd6.c */
VNET_DECLARE(int, nd6_prune);
VNET_DECLARE(int, nd6_delay);
VNET_DECLARE(int, nd6_umaxtries);
VNET_DECLARE(int, nd6_mmaxtries);
VNET_DECLARE(int, nd6_useloopback);
VNET_DECLARE(int, nd6_maxnudhint);
VNET_DECLARE(int, nd6_gctimer);
VNET_DECLARE(struct nd_prhead, nd_prefix);
VNET_DECLARE(int, nd6_debug);
VNET_DECLARE(int, nd6_onlink_ns_rfc4861);
#define V_nd6_prune                     VNET(nd6_prune)
#define V_nd6_delay                     VNET(nd6_delay)
#define V_nd6_umaxtries                 VNET(nd6_umaxtries)
#define V_nd6_mmaxtries                 VNET(nd6_mmaxtries)
#define V_nd6_useloopback               VNET(nd6_useloopback)
#define V_nd6_maxnudhint                VNET(nd6_maxnudhint)
#define V_nd6_gctimer                   VNET(nd6_gctimer)
#define V_nd_prefix                     VNET(nd_prefix)
#define V_nd6_debug                     VNET(nd6_debug)
#define V_nd6_onlink_ns_rfc4861         VNET(nd6_onlink_ns_rfc4861)
 
/* Lock for the prefix and default router lists. */
VNET_DECLARE(struct rwlock, nd6_lock);
VNET_DECLARE(uint64_t, nd6_list_genid);
#define V_nd6_lock                      VNET(nd6_lock)
#define V_nd6_list_genid                VNET(nd6_list_genid)
 
#define ND6_RLOCK()                     rw_rlock(&V_nd6_lock)
#define ND6_RUNLOCK()                   rw_runlock(&V_nd6_lock)
#define ND6_WLOCK()                     rw_wlock(&V_nd6_lock)
#define ND6_WUNLOCK()                   rw_wunlock(&V_nd6_lock)
#define ND6_TRY_UPGRADE()               rw_try_upgrade(&V_nd6_lock)
#define ND6_WLOCK_ASSERT()              rw_assert(&V_nd6_lock, RA_WLOCKED)
#define ND6_RLOCK_ASSERT()              rw_assert(&V_nd6_lock, RA_RLOCKED)
#define ND6_LOCK_ASSERT()               rw_assert(&V_nd6_lock, RA_LOCKED)
#define ND6_UNLOCK_ASSERT()             rw_assert(&V_nd6_lock, RA_UNLOCKED)
 
/* Mutex for prefix onlink/offlink transitions. */
VNET_DECLARE(struct mtx, nd6_onlink_mtx);
#define V_nd6_onlink_mtx                VNET(nd6_onlink_mtx)
 
#define ND6_ONLINK_LOCK()               mtx_lock(&V_nd6_onlink_mtx)
#define ND6_ONLINK_TRYLOCK()            mtx_trylock(&V_nd6_onlink_mtx)
#define ND6_ONLINK_UNLOCK()             mtx_unlock(&V_nd6_onlink_mtx)
#define ND6_ONLINK_LOCK_ASSERT()        mtx_assert(&V_nd6_onlink_mtx, MA_OWNED)
#define ND6_ONLINK_UNLOCK_ASSERT()      mtx_assert(&V_nd6_onlink_mtx, MA_NOTOWNED)
 
#define nd6log(x)       do { if (V_nd6_debug) log x; } while (/*CONSTCOND*/ 0)
 
/* nd6_rtr.c */
VNET_DECLARE(int, nd6_defifindex);
VNET_DECLARE(int, ip6_desync_factor);   /* seconds */
VNET_DECLARE(u_int32_t, ip6_temp_preferred_lifetime); /* seconds */
VNET_DECLARE(u_int32_t, ip6_temp_valid_lifetime); /* seconds */
VNET_DECLARE(int, ip6_temp_regen_advance); /* seconds */
#define V_nd6_defifindex                VNET(nd6_defifindex)
#define V_ip6_desync_factor             VNET(ip6_desync_factor)
#define V_ip6_temp_preferred_lifetime   VNET(ip6_temp_preferred_lifetime)
#define V_ip6_temp_valid_lifetime       VNET(ip6_temp_valid_lifetime)
#define V_ip6_temp_regen_advance        VNET(ip6_temp_regen_advance)
 
union nd_opts {
        struct nd_opt_hdr *nd_opt_array[16];    /* max = ND_OPT_NONCE */
        struct {
                struct nd_opt_hdr *zero;
                struct nd_opt_hdr *src_lladdr;
                struct nd_opt_hdr *tgt_lladdr;
                struct nd_opt_prefix_info *pi_beg; /* multiple opts, start */
                struct nd_opt_rd_hdr *rh;
                struct nd_opt_mtu *mtu;
                struct nd_opt_hdr *__res6;
                struct nd_opt_hdr *__res7;
                struct nd_opt_hdr *__res8;
                struct nd_opt_hdr *__res9;
                struct nd_opt_hdr *__res10;
                struct nd_opt_hdr *__res11;
                struct nd_opt_hdr *__res12;
                struct nd_opt_hdr *__res13;
                struct nd_opt_nonce *nonce;
                struct nd_opt_hdr *__res15;
                struct nd_opt_hdr *search;      /* multiple opts */
                struct nd_opt_hdr *last;        /* multiple opts */
                int done;
                struct nd_opt_prefix_info *pi_end;/* multiple opts, end */
        } nd_opt_each;
};
#define nd_opts_src_lladdr      nd_opt_each.src_lladdr
#define nd_opts_tgt_lladdr      nd_opt_each.tgt_lladdr
#define nd_opts_pi              nd_opt_each.pi_beg
#define nd_opts_pi_end          nd_opt_each.pi_end
#define nd_opts_rh              nd_opt_each.rh
#define nd_opts_mtu             nd_opt_each.mtu
#define nd_opts_nonce           nd_opt_each.nonce
#define nd_opts_search          nd_opt_each.search
#define nd_opts_last            nd_opt_each.last
#define nd_opts_done            nd_opt_each.done
 
/* XXX: need nd6_var.h?? */
/* nd6.c */
void nd6_init(void);
#ifdef VIMAGE
void nd6_destroy(void);
#endif
struct nd_ifinfo *nd6_ifattach(struct ifnet *);
void nd6_ifdetach(struct ifnet *, struct nd_ifinfo *);
int nd6_is_addr_neighbor(const struct sockaddr_in6 *, struct ifnet *);
void nd6_option_init(void *, int, union nd_opts *);
struct nd_opt_hdr *nd6_option(union nd_opts *);
int nd6_options(union nd_opts *);
struct llentry *nd6_lookup(const struct in6_addr *, int, struct ifnet *);
void nd6_setmtu(struct ifnet *);
void nd6_llinfo_setstate(struct llentry *lle, int newstate);
void nd6_timer(void *);
void nd6_purge(struct ifnet *);
int nd6_resolve_addr(struct ifnet *ifp, int flags, const struct sockaddr *dst,
    char *desten, uint32_t *pflags);
int nd6_resolve(struct ifnet *, int, struct mbuf *,
    const struct sockaddr *, u_char *, uint32_t *, struct llentry **);
int nd6_ioctl(u_long, caddr_t, struct ifnet *);
void nd6_cache_lladdr(struct ifnet *, struct in6_addr *,
        char *, int, int, int);
bool nd6_try_set_entry_addr(struct ifnet *ifp, struct llentry *lle, char *lladdr);
struct mbuf *nd6_grab_holdchain(struct llentry *);
int nd6_flush_holdchain(struct ifnet *, struct llentry *, struct mbuf *);
void nd6_flush_children_holdchain(struct ifnet *, struct llentry *);
int nd6_add_ifa_lle(struct in6_ifaddr *);
void nd6_rem_ifa_lle(struct in6_ifaddr *, int);
int nd6_output_ifp(struct ifnet *, struct ifnet *, struct mbuf *,
    struct sockaddr_in6 *, struct route *);
 
struct rib_head;
struct rib_cmd_info;
void nd6_subscription_cb(struct rib_head *rnh, struct rib_cmd_info *rc,
    void *arg);
 
/* nd6_nbr.c */
void nd6_na_input(struct mbuf *, int, int);
void nd6_na_output(struct ifnet *, const struct in6_addr *,
        const struct in6_addr *, u_long, int, struct sockaddr *);
void nd6_ns_input(struct mbuf *, int, int);
void nd6_ns_output(struct ifnet *, const struct in6_addr *,
        const struct in6_addr *, const struct in6_addr *, uint8_t *);
caddr_t nd6_ifptomac(struct ifnet *);
void nd6_dad_init(void);
void nd6_dad_start(struct ifaddr *, int);
void nd6_dad_stop(struct ifaddr *);
 
/* nd6_rtr.c */
void nd6_rs_input(struct mbuf *, int, int);
void nd6_ra_input(struct mbuf *, int, int);
void nd6_ifnet_link_event(void *, struct ifnet *, int);
struct nd_defrouter *defrouter_lookup(const struct in6_addr *, struct ifnet *);
struct nd_defrouter *defrouter_lookup_locked(const struct in6_addr *,
    struct ifnet *);
void defrouter_reset(void);
void defrouter_select_fib(int fibnum);
void defrouter_rele(struct nd_defrouter *);
bool defrouter_remove(struct in6_addr *, struct ifnet *);
bool nd6_defrouter_list_empty(void);
void nd6_defrouter_flush_all(void);
void nd6_defrouter_purge(struct ifnet *);
void nd6_defrouter_timer(void);
void nd6_defrouter_init(void);
int nd6_prelist_add(struct nd_prefixctl *, struct nd_defrouter *,
    struct nd_prefix **);
void nd6_prefix_unlink(struct nd_prefix *, struct nd_prhead *);
void nd6_prefix_del(struct nd_prefix *);
void nd6_prefix_ref(struct nd_prefix *);
void nd6_prefix_rele(struct nd_prefix *);
int nd6_prefix_offlink(struct nd_prefix *);
void pfxlist_onlink_check(void);
struct nd_prefix *nd6_prefix_lookup(struct nd_prefixctl *);
void rt6_flush(struct in6_addr *, struct ifnet *);
int nd6_setdefaultiface(int);
int in6_tmpifadd(const struct in6_ifaddr *, int, int);
 
#endif /* _KERNEL */
 
#endif /* _NETINET6_ND6_H_ */