FreeBSD/Linux Kernel Cross Reference
sys/net/if_var.h

     /*
      * Copyright (c) 1982, 1986, 1989, 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. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. 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.
     *
     *      From: @(#)if.h  8.1 (Berkeley) 6/10/93
     * $FreeBSD: src/sys/net/if_var.h,v 1.18.2.16 2003/04/15 18:11:19 fjoe Exp $
     */
    
    #ifndef _NET_IF_VAR_H_
    #define _NET_IF_VAR_H_
    
    #ifndef _SYS_SERIALIZE_H_
    #include <sys/serialize.h>
    #endif
    #ifndef _NET_IF_H_
    #include <net/if.h>
    #endif
    #ifndef _SYS_MUTEX_H_
    #include <sys/mutex.h>
    #endif
    
    /*
     * Structures defining a network interface, providing a packet
     * transport mechanism (ala level 0 of the PUP protocols).
     *
     * Each interface accepts output datagrams of a specified maximum
     * length, and provides higher level routines with input datagrams
     * received from its medium.
     *
     * Output occurs when the routine if_output is called, with four parameters:
     *      ifp->if_output(ifp, m, dst, rt)
     * Here m is the mbuf chain to be sent and dst is the destination address.
     * The output routine encapsulates the supplied datagram if necessary,
     * and then transmits it on its medium.
     *
     * On input, each interface unwraps the data received by it, and either
     * places it on the input queue of a internetwork datagram routine
     * and posts the associated software interrupt, or passes the datagram to
     * the routine if_input. It is called with the mbuf chain as parameter:
     *      ifp->if_input(ifp, m)
     * The input routine removes the protocol dependent header if necessary.
     * NOTE:
     * Driver may call type specific interface, e.g. ether_input_pkt(), instead
     * of if_input, to take advantage of hardware supplied information.
     *
     * Routines exist for locating interfaces by their addresses
     * or for locating a interface on a certain network, as well as more general
     * routing and gateway routines maintaining information used to locate
     * interfaces.  These routines live in the files if.c and route.c
     */
    
    /*
     * Forward structure declarations for function prototypes [sic].
     */
    struct  mbuf;
    struct  proc;
    struct  rtentry;
    struct  rt_addrinfo;
    struct  socket;
    struct  ether_header;
    struct  ucred;
    struct  lwkt_serialize;
    struct  ifaddr_container;
    struct  ifaddr;
    struct  lwkt_port;
    struct  lwkt_msg;
    union   netmsg;
    struct  pktinfo;
    struct  ifpoll_info;
    struct  ifdata_pcpu;
    
   #include <sys/queue.h>          /* get TAILQ macros */
   
   #include <net/altq/if_altq.h>
   
   #ifdef _KERNEL
   #include <sys/eventhandler.h>
   #include <sys/mbuf.h>
   #include <sys/systm.h>          /* XXX */
   #include <sys/thread2.h>
   #endif /* _KERNEL */
   
   #define IF_DUNIT_NONE   -1
   
   TAILQ_HEAD(ifnethead, ifnet);   /* we use TAILQs so that the order of */
   TAILQ_HEAD(ifaddrhead, ifaddr_container); /* instantiation is preserved in the list */
   TAILQ_HEAD(ifprefixhead, ifprefix);
   TAILQ_HEAD(ifmultihead, ifmultiaddr);
   
   /*
    * Structure defining a mbuf queue.
    */
   struct ifqueue {
           struct  mbuf *ifq_head;
           struct  mbuf *ifq_tail;
           int     ifq_len;
           int     ifq_maxlen;
           int     ifq_drops;
   };
   
   /*
    * Note of IFPOLL_ENABLE
    * 1) Any file(*.c) that depends on IFPOLL_ENABLE supports in this
    *    file should include opt_ifpoll.h at its beginning.
    * 2) When struct changes, which are conditioned by IFPOLL_ENABLE,
    *    are to be introduced, please keep the struct's size and layout
    *    same, no matter whether IFPOLL_ENABLE is defined or not.
    *    See ifnet.if_npoll and ifnet.if_npoll_unused for example.
    */
   
   /*
    * Network serialize/deserialize types
    */
   enum ifnet_serialize {
           IFNET_SERIALIZE_ALL     /* all serializers */
   };
   
   #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
   
   /*
    * Structure defining a network interface.
    *
    * (Would like to call this struct ``if'', but C isn't PL/1.)
    */
   
   /*
    * NB: For DragonFlyBSD, it is assumed that each NIC driver's softc starts
    * with one of these structures, typically held within an arpcom structure.
    *
    *      struct <foo>_softc {
    *              struct arpcom {
    *                      struct  ifnet ac_if;
    *                      ...
    *              } <arpcom> ;
    *              ...   
    *      };
    *
    * The assumption is used in a number of places, including many
    * files in sys/net, device drivers, and sys/dev/mii.c:miibus_attach().
    *
    * Unfortunately devices' softc are opaque, so we depend on this layout
    * to locate the struct ifnet from the softc in the generic code.
    *
    *
    *
    * MPSAFE NOTES:
    *
    * ifnet is protected by calling if_serialize, if_tryserialize and
    * if_deserialize serialize functions with the ifnet_serialize parameter.
    * Callers of if_ioctl, if_watchdog, if_init, if_resolvemulti, and if_npoll
    * should call the ifnet serialize functions with IFNET_SERIALIZE_ALL.
    *
    * if_snd subqueues are protected by its own serializers.  Callers of
    * if_start should call ifsq_serialiize_hw(), ifsq_deserialize_hw() and
    * ifsq_tryserialize_hw() to properly serialize hardware for transmission.
    *
    * Caller of if_output MUST NOT serialize ifnet or if_snd by calling
    * the related serialize functions.
    *
    * For better tranmission performance, driver should setup if_snd subqueue
    * owner cpuid properly using ifsq_set_cpuid() (or ifq_set_cpuid(), if not
    * multiple transmit queue capable).  Normally, the if_snd subqueue owner
    * cpu is the one that processing the transmission interrupt.  And in driver,
    * direct call of if_start should be avoided, use ifsq_devstart() or
    * ifsq_devstart_sched() instead (or if_devstart()/if_devstart_sched(), if
    * not multiple transmit queue capable).
    *
    *
    *
    * STATISTICS:
    *
    * if_data is no longer used to hold per interface statistics, so DO NOT use
    * the old style ifp->if_ipackets++ to update statistics; instead IFNET_STAT_
    * macros should be used.
    *
    *
    *
    * SINGLE SERIALIZER MODE:
    *
    * In this mode, driver MUST NOT setup if_serialize, if_deserialize,
    * if_tryserialize or if_serialize_assert.  Driver could supply its own
    * serializer to be used (through the type specific attach function, e.g.
    * ether_ifattach()) or it could depend on the default serializer.  In this
    * mode if_serializer will be setup properly.
    *
    * If a device driver installs the same serializer for its interrupt
    * as for ifnet, then the driver only really needs to worry about further
    * serialization in timeout based entry points and device_method_t entry
    * points.  All other entry points will already be serialized.
    *
    *
    *
    * MULTI SERIALIZERS MODE:
    *
    * In this mode, driver MUST setup if_serialize, if_deserialize,
    * if_tryserialize and if_serialize_assert.  Driver MUST NOT supply its own
    * serializer to be used.  In this mode, if_serializer will be left as NULL.
    * And driver MUST setup if_snd subqueues' hardware serailizer properly by
    * calling ifsq_set_hw_serialize().
    *
    *
    *
    * MULTIPLE TRANSMIT QUEUES:
    *
    * This should be implemented in "MULTI SERIALIZERS MODE".  Legacy if_watchdog
    * method SHOULD NOT be used.
    *
    * 1) Attach
    *
    * Before the type specific attach, e.g. ether_ifattach(), driver should
    * setup the transmit queue count and cpuid to subqueue mapping method
    * properly (assume QCOUNT is power of 2):
    *
    *      ifq_set_subq_cnt(&ifp->if_snd, QCOUNT);
    *      ifp->if_mapsubq = ifq_mapsubq_mask;
    *      ifq_set_subq_mask(&ifp->if_snd, QCOUNT - 1);
    *
    * After the type specific attach, driver should setup the subqueues owner
    * cpu, serializer and watchdog properly:
    *
    *      for (i = 0; i < QCOUNT, ++i) {
    *              struct ifaltq_subque *ifsq = ifq_get_subq(&ifp->if_snd, i);
    *
    *              ifsq_set_cpuid(ifsq, Q_CPUID);
    *              ifsq_set_hw_serialize(ifsq, Q_SLIZE);
    *              ifsq_watchdog_init(Q_WDOG, ifsq, Q_WDOG_FUNC);
    *      }
    *
    * Q_CPUID, the cpu which handles the hardware transmit queue interrupt
    * Q_SLIZE, the serializer protects the hardware transmit queue
    * Q_WDOG, per hardware transmit queue watchdog handler, struct ifsubq_watchdog
    * Q_WDOG_FUNC, watchdog function, probably should reset hardware
    *
    * 2) Stop
    *
    * Make sure per hardware transmit queue watchdog is stopped and oactive is
    * cleared:
    *
    *      for (i = 0; i < QCOUNT, ++i) {
    *              ifsq_clr_oactive(ifsq);
    *              ifsq_watchdog_stop(Q_WDOG);
    *      }
    *
    * 3) Initialize
    *
    * Make sure per hardware transmit queue watchdog is started and oactive is
    * cleared:
    *
    *      for (i = 0; i < QCOUNT, ++i) {
    *              ifsq_clr_oactive(ifsq);
    *              ifsq_watchdog_start(Q_WDOG);
    *      }
    *
    * 4) if_start
    *
    * if_start takes subqueue as parameter, so instead of using ifq_ functions
    * ifsq_ functions should be used.  If device could not be programmed to
    * transmit when no media link is not up, MAKE SURE to purge the subqueue:
    *
    *      if ((ifp->if_flags & IFF_RUNNING) == 0 || ifsq_is_oactive(ifsq))
    *              return;
    *      if (NO_LINK) {
    *              ifsq_purge(ifsq);
    *              return;
    *      }
    *      for (;;) {
    *              if (NO_FREE_DESC) {
    *                      ifsq_set_oactive(ifsq);
    *                      break;
    *              }
    *              m = ifsq_dequeue(ifsq);
    *              if (m != NULL)
    *                      DRIVER_ENCAP(m);
    *              Q_WDOG.wd_timer = WDOG_TIMEOUT;
    *      }
    *
    * 5) Transmission done, e.g. transmit queue interrupt processing
    *
    * Same as if_start, ifsq_ functions should be used:
    *
    *      DRIVER_COLLECT_DESC();
    *      if (HAS_FREE_DESC)
    *              ifsq_clr_oactive(ifsq);
    *      if (NO_PENDING_DESC)
    *              Q_WDOG.wd_timer = 0;
    *      if (!ifsq_is_empty(ifsq))
    *              ifsq_devstart(ifsq);
    */
   struct ifnet {
           void    *if_softc;              /* pointer to driver state */
           void    *if_l2com;              /* pointer to protocol bits */
           TAILQ_ENTRY(ifnet) if_link;     /* all struct ifnets are chained */
           char    if_xname[IFNAMSIZ];     /* external name (name + unit) */
           const char *if_dname;           /* driver name */
           int     if_dunit;               /* unit or IF_DUNIT_NONE */
           void    *if_vlantrunks;         /* vlan trunks */
           struct  ifaddrhead *if_addrheads; /* per-cpu per-if addresses */
           int     if_pcount;              /* number of promiscuous listeners */
           void    *if_carp;               /* carp interfaces */
           struct  bpf_if *if_bpf;         /* packet filter structure */
           u_short if_index;               /* numeric abbreviation for this if  */
           short   if_timer;               /* time 'til if_watchdog called */
           int     if_flags;               /* up/down, broadcast, etc. */
           int     if_capabilities;        /* interface capabilities */
           int     if_capenable;           /* enabled features */
           void    *if_linkmib;            /* link-type-specific MIB data */
           size_t  if_linkmiblen;          /* length of above data */
           struct  if_data if_data;        /* NOTE: stats are in if_data_pcpu */
           struct  ifmultihead if_multiaddrs; /* multicast addresses configured */
           int     if_amcount;             /* number of all-multicast requests */
   /* procedure handles */
           int     (*if_output)            /* output routine (enqueue) */
                   (struct ifnet *, struct mbuf *, struct sockaddr *,
                        struct rtentry *);
           void    (*if_input)             /* input routine from hardware driver */
                   (struct ifnet *, struct mbuf *);
           void    (*if_start)             /* initiate output routine */
                   (struct ifnet *, struct ifaltq_subque *);
           int     (*if_ioctl)             /* ioctl routine */
                   (struct ifnet *, u_long, caddr_t, struct ucred *);
           void    (*if_watchdog)          /* timer routine */
                   (struct ifnet *);
           void    (*if_init)              /* init routine */
                   (void *);
           int     (*if_resolvemulti)      /* validate/resolve multicast */
                   (struct ifnet *, struct sockaddr **, struct sockaddr *);
           void    *if_unused5;
           TAILQ_HEAD(, ifg_list) if_groups; /* linked list of groups per if */
           int     (*if_mapsubq)           /* cpuid to if_snd subqueue map */
                   (struct ifaltq *, int);
           int     if_unused2;
   
           /*
            * ifnet serialize functions
            */
           void    (*if_serialize)
                   (struct ifnet *, enum ifnet_serialize);
           void    (*if_deserialize)
                   (struct ifnet *, enum ifnet_serialize);
           int     (*if_tryserialize)
                   (struct ifnet *, enum ifnet_serialize);
   #ifdef INVARIANTS
           void    (*if_serialize_assert)
                   (struct ifnet *, enum ifnet_serialize, boolean_t);
   #else
           /* Place holder */
           void    (*if_serialize_unused)(void);
   #endif
   
   #ifdef IFPOLL_ENABLE
           void    (*if_npoll)             /* polling config */
                   (struct ifnet *, struct ifpoll_info *);
   #else
           /* Place holder */
           void    (*if_npoll_unused)(void);
   #endif
           int     if_tsolen;              /* max TSO length */
           struct  ifaltq if_snd;          /* output subqueues */
           struct  ifprefixhead if_prefixhead; /* list of prefixes per if */
           const uint8_t   *if_broadcastaddr;
           void    *if_bridge;             /* bridge glue */
           void    *if_afdata[AF_MAX];
           struct ifaddr   *if_lladdr;
   
           /* serializer, in single serializer mode */
           struct lwkt_serialize *if_serializer;
           /*
            * default serializer, in single serializer mode,
            * if driver does not supply one
            */
           struct lwkt_serialize if_default_serializer;
   
           struct mtx      if_ioctl_mtx;   /* high-level ioctl mutex */
           int     if_unused4;
           struct ifdata_pcpu *if_data_pcpu; /* per-cpu stats */
           void    *if_pf_kif;             /* pf interface */
           void    *if_unused7;
   };
   typedef void if_init_f_t (void *);
   
   #define if_mtu          if_data.ifi_mtu
   #define if_type         if_data.ifi_type
   #define if_physical     if_data.ifi_physical
   #define if_addrlen      if_data.ifi_addrlen
   #define if_hdrlen       if_data.ifi_hdrlen
   #define if_metric       if_data.ifi_metric
   #define if_link_state   if_data.ifi_link_state
   #define if_baudrate     if_data.ifi_baudrate
   #define if_hwassist     if_data.ifi_hwassist
   #define if_ipackets     if_data.ifi_ipackets
   #define if_ierrors      if_data.ifi_ierrors
   #define if_opackets     if_data.ifi_opackets
   #define if_oerrors      if_data.ifi_oerrors
   #define if_collisions   if_data.ifi_collisions
   #define if_ibytes       if_data.ifi_ibytes
   #define if_obytes       if_data.ifi_obytes
   #define if_imcasts      if_data.ifi_imcasts
   #define if_omcasts      if_data.ifi_omcasts
   #define if_iqdrops      if_data.ifi_iqdrops
   #define if_noproto      if_data.ifi_noproto
   #define if_lastchange   if_data.ifi_lastchange
   #define if_recvquota    if_data.ifi_recvquota
   #define if_xmitquota    if_data.ifi_xmitquota
   #define if_rawoutput(if, m, sa) if_output(if, m, sa, NULL)
   
   /* for compatibility with other BSDs */
   #define if_list         if_link
   
   /*
    * Per-cpu interface statistics
    */
   struct ifdata_pcpu {
           u_long  ifd_ipackets;           /* packets received on interface */
           u_long  ifd_ierrors;            /* input errors on interface */
           u_long  ifd_opackets;           /* packets sent on interface */
           u_long  ifd_oerrors;            /* output errors on interface */
           u_long  ifd_collisions;         /* collisions on csma interfaces */
           u_long  ifd_ibytes;             /* total number of octets received */
           u_long  ifd_obytes;             /* total number of octets sent */
           u_long  ifd_imcasts;            /* packets received via multicast */
           u_long  ifd_omcasts;            /* packets sent via multicast */
           u_long  ifd_iqdrops;            /* dropped on input, this interface */
           u_long  ifd_noproto;            /* destined for unsupported protocol */
   } __cachealign;
   
   #endif  /* _KERNEL || _KERNEL_STRUCTURES */
   
   /*
    * ifqueue operation macros
    */
   #define IF_QFULL(ifq)           ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
   #define IF_DROP(ifq)            ((ifq)->ifq_drops++)
   #define IF_QLEN(ifq)            ((ifq)->ifq_len)
   #define IF_QEMPTY(ifq)          (IF_QLEN(ifq) == 0)
   
   #define IF_ENQUEUE(ifq, m) do {                                         \
           (m)->m_nextpkt = NULL;                                          \
           if ((ifq)->ifq_tail == NULL)                                    \
                   (ifq)->ifq_head = m;                                    \
           else                                                            \
                   (ifq)->ifq_tail->m_nextpkt = m;                         \
           (ifq)->ifq_tail = m;                                            \
           (ifq)->ifq_len++;                                               \
   } while (0)
   
   #define IF_PREPEND(ifq, m) do {                                         \
           (m)->m_nextpkt = (ifq)->ifq_head;                               \
           if ((ifq)->ifq_tail == NULL)                                    \
                   (ifq)->ifq_tail = (m);                                  \
           (ifq)->ifq_head = (m);                                          \
           (ifq)->ifq_len++;                                               \
   } while (0)
   
   #define IF_DEQUEUE(ifq, m) do {                                         \
           (m) = (ifq)->ifq_head;                                          \
           if (m) {                                                        \
                   if (((ifq)->ifq_head = (m)->m_nextpkt) == NULL)         \
                           (ifq)->ifq_tail = NULL;                         \
                   (m)->m_nextpkt = NULL;                                  \
                   (ifq)->ifq_len--;                                       \
           }                                                               \
   } while (0)
   
   #define IF_POLL(ifq, m)         ((m) = (ifq)->ifq_head)
   
   #define IF_DRAIN(ifq) do {                                              \
           struct mbuf *m;                                                 \
           while (1) {                                                     \
                   IF_DEQUEUE(ifq, m);                                     \
                   if (m == NULL)                                          \
                           break;                                          \
                   m_freem(m);                                             \
           }                                                               \
   } while (0)
   
   #ifdef _KERNEL
   
   /* interface link layer address change event */
   typedef void (*iflladdr_event_handler_t)(void *, struct ifnet *);
   EVENTHANDLER_DECLARE(iflladdr_event, iflladdr_event_handler_t);
   
   #ifdef INVARIANTS
   #define ASSERT_IFNET_SERIALIZED_ALL(ifp) \
           (ifp)->if_serialize_assert((ifp), IFNET_SERIALIZE_ALL, TRUE)
   #define ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp) \
           (ifp)->if_serialize_assert((ifp), IFNET_SERIALIZE_ALL, FALSE)
   #else
   #define ASSERT_IFNET_SERIALIZED_ALL(ifp)        ((void)0)
   #define ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp)    ((void)0)
   #endif
   
   static __inline void
   ifnet_serialize_all(struct ifnet *_ifp)
   {
           _ifp->if_serialize(_ifp, IFNET_SERIALIZE_ALL);
   }
   
   static __inline void
   ifnet_deserialize_all(struct ifnet *_ifp)
   {
           _ifp->if_deserialize(_ifp, IFNET_SERIALIZE_ALL);
   }
   
   static __inline int
   ifnet_tryserialize_all(struct ifnet *_ifp)
   {
           return _ifp->if_tryserialize(_ifp, IFNET_SERIALIZE_ALL);
   }
   
   /*
    * 72 was chosen below because it is the size of a TCP/IP
    * header (40) + the minimum mss (32).
    */
   #define IF_MINMTU       72
   #define IF_MAXMTU       65535
   
   #endif /* _KERNEL */
   
   struct in_ifaddr;
   
   struct in_ifaddr_container {
           struct in_ifaddr        *ia;
           LIST_ENTRY(in_ifaddr_container) ia_hash;
                                   /* entry in bucket of inet addresses */
           TAILQ_ENTRY(in_ifaddr_container) ia_link;
                                   /* list of internet addresses */
           struct ifaddr_container *ia_ifac; /* parent ifaddr_container */
   };
   
   /*
    * Per-cpu ifaddr container:
    * - per-cpu ifaddr reference count
    * - linkage to per-cpu addresses lists
    * - per-cpu ifaddr statistics
    */
   struct ifaddr_container {
   #define IFA_CONTAINER_MAGIC     0x19810219
   #define IFA_CONTAINER_DEAD      0xc0dedead
           uint32_t                ifa_magic;  /* IFA_CONTAINER_MAGIC */
           struct ifaddr           *ifa;
           TAILQ_ENTRY(ifaddr_container)   ifa_link;   /* queue macro glue */
           u_int                   ifa_refcnt; /* references to this structure */
           uint16_t                ifa_listmask;   /* IFA_LIST_ */
           uint16_t                ifa_prflags;    /* protocol specific flags */
   
           u_long                  ifa_ipackets;   /* packets received on addr */
           u_long                  ifa_ibytes;     /* bytes received on addr */
           u_long                  ifa_opackets;   /* packets sent on addr */
           u_long                  ifa_obytes;     /* bytes sent on addr */
   
           /*
            * Protocol specific states
            */
           union {
                   struct in_ifaddr_container u_in_ifac;
           } ifa_proto_u;
   } __cachealign;
   
   #define IFA_LIST_IFADDRHEAD     0x01    /* on ifnet.if_addrheads[cpuid] */
   #define IFA_LIST_IN_IFADDRHEAD  0x02    /* on in_ifaddrheads[cpuid] */
   #define IFA_LIST_IN_IFADDRHASH  0x04    /* on in_ifaddrhashtbls[cpuid] */
   
   #define IFA_PRF_FLAG0           0x01
   #define IFA_PRF_FLAG1           0x02
   #define IFA_PRF_FLAG2           0x04
   #define IFA_PRF_FLAG3           0x08
   
   /*
    * The ifaddr structure contains information about one address
    * of an interface.  They are maintained by the different address families,
    * are allocated and attached when an address is set, and are linked
    * together so all addresses for an interface can be located.
    *
    * NOTE:
    * Statistics are no longer stored in if_data, instead, they are stored
    * in the per-cpu ifaddr_container.  So don't use the old style
    * ifa->if_ipackets++ to update statistics, use IFA_STAT_ macros.
    */
   struct ifaddr {
           struct  sockaddr *ifa_addr;     /* address of interface */
           struct  sockaddr *ifa_dstaddr;  /* other end of p-to-p link */
   #define ifa_broadaddr   ifa_dstaddr     /* broadcast address interface */
           struct  sockaddr *ifa_netmask;  /* used to determine subnet */
           struct  if_data if_data;        /* not all members are meaningful */
           struct  ifnet *ifa_ifp;         /* back-pointer to interface */
           void    *ifa_link_pad;
           struct ifaddr_container *ifa_containers; /* per-cpu data */
           void    (*ifa_rtrequest)        /* check or clean routes (+ or -)'d */
                   (int, struct rtentry *);
           u_short ifa_flags;              /* mostly rt_flags for cloning */
           int     ifa_ncnt;               /* # of valid ifaddr_container */
           int     ifa_metric;             /* cost of going out this interface */
   #ifdef notdef
           struct  rtentry *ifa_rt;        /* XXXX for ROUTETOIF ????? */
   #endif
           int (*ifa_claim_addr)           /* check if an addr goes to this if */
                   (struct ifaddr *, struct sockaddr *);
   
   };
   #define IFA_ROUTE       RTF_UP          /* route installed */
   
   /* for compatibility with other BSDs */
   #define ifa_list        ifa_link
   
   /*
    * The prefix structure contains information about one prefix
    * of an interface.  They are maintained by the different address families,
    * are allocated and attached when an prefix or an address is set,
    * and are linked together so all prefixes for an interface can be located.
    */
   struct ifprefix {
           struct  sockaddr *ifpr_prefix;  /* prefix of interface */
           struct  ifnet *ifpr_ifp;        /* back-pointer to interface */
           TAILQ_ENTRY(ifprefix) ifpr_list; /* queue macro glue */
           u_char  ifpr_plen;              /* prefix length in bits */
           u_char  ifpr_type;              /* protocol dependent prefix type */
   };
   
   /*
    * Multicast address structure.  This is analogous to the ifaddr
    * structure except that it keeps track of multicast addresses.
    * Also, the reference count here is a count of requests for this
    * address, not a count of pointers to this structure.
    */
   struct ifmultiaddr {
           TAILQ_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */
           struct  sockaddr *ifma_addr;    /* address this membership is for */
           struct  sockaddr *ifma_lladdr;  /* link-layer translation, if any */
           struct  ifnet *ifma_ifp;        /* back-pointer to interface */
           u_int   ifma_refcount;          /* reference count */
           void    *ifma_protospec;        /* protocol-specific state, if any */
   };
   
   #ifdef _KERNEL
   
   /*
    * ifaddr statistics update macro
    */
   #define IFA_STAT_INC(ifa, name, v) \
   do { \
           (ifa)->ifa_containers[mycpuid].ifa_##name += (v); \
   } while (0)
   
   /*
    * Interface (ifnet) statistics update macros
    */
   #define IFNET_STAT_INC(ifp, name, v) \
   do { \
           (ifp)->if_data_pcpu[mycpuid].ifd_##name += (v); \
   } while (0)
   
   #define IFNET_STAT_SET(ifp, name, v) \
   do { \
           int _cpu; \
           (ifp)->if_data_pcpu[0].ifd_##name = (v); \
           for (_cpu = 1; _cpu < ncpus; ++_cpu) \
                   (ifp)->if_data_pcpu[_cpu].ifd_##name = 0; \
   } while (0)
   
   #define IFNET_STAT_GET(ifp, name, v) \
   do { \
           int _cpu; \
           (v) = (ifp)->if_data_pcpu[0].ifd_##name; \
           for (_cpu = 1; _cpu < ncpus; ++_cpu) \
                   (v) += (ifp)->if_data_pcpu[_cpu].ifd_##name; \
   } while (0)
   
   #ifndef _SYS_SERIALIZE2_H_
   #include <sys/serialize2.h>
   #endif
   
   enum ifaddr_event {
           IFADDR_EVENT_ADD,
           IFADDR_EVENT_DELETE,
           IFADDR_EVENT_CHANGE
   };
   
   /* interface address change event */
   typedef void (*ifaddr_event_handler_t)(void *, struct ifnet *,
           enum ifaddr_event, struct ifaddr *);
   EVENTHANDLER_DECLARE(ifaddr_event, ifaddr_event_handler_t);
   /* new interface attach event */
   typedef void (*ifnet_attach_event_handler_t)(void *, struct ifnet *);
   EVENTHANDLER_DECLARE(ifnet_attach_event, ifnet_attach_event_handler_t);
   /* interface detach event */
   typedef void (*ifnet_detach_event_handler_t)(void *, struct ifnet *);
   EVENTHANDLER_DECLARE(ifnet_detach_event, ifnet_detach_event_handler_t);
   
   /*
    * interface groups
    */
   struct ifg_group {
           char                             ifg_group[IFNAMSIZ];
           u_int                            ifg_refcnt;
           void                            *ifg_pf_kif;
           int                              ifg_carp_demoted;
           TAILQ_HEAD(, ifg_member)         ifg_members;
           TAILQ_ENTRY(ifg_group)           ifg_next;
   };
   
   struct ifg_member {
           TAILQ_ENTRY(ifg_member)  ifgm_next;
           struct ifnet            *ifgm_ifp;
   };
   
   struct ifg_list {
           struct ifg_group        *ifgl_group;
           TAILQ_ENTRY(ifg_list)    ifgl_next;
   };
   
   /* group attach event */
   typedef void (*group_attach_event_handler_t)(void *, struct ifg_group *);
   EVENTHANDLER_DECLARE(group_attach_event, group_attach_event_handler_t);
   /* group detach event */
   typedef void (*group_detach_event_handler_t)(void *, struct ifg_group *);
   EVENTHANDLER_DECLARE(group_detach_event, group_detach_event_handler_t);
   /* group change event */
   typedef void (*group_change_event_handler_t)(void *, const char *);
   EVENTHANDLER_DECLARE(group_change_event, group_change_event_handler_t);
   
   
   #ifdef INVARIANTS
   #define ASSERT_IFAC_VALID(ifac) do { \
           KKASSERT((ifac)->ifa_magic == IFA_CONTAINER_MAGIC); \
           KKASSERT((ifac)->ifa_refcnt > 0); \
   } while (0)
   #else
   #define ASSERT_IFAC_VALID(ifac) ((void)0)
   #endif
   
   static __inline void
   _IFAREF(struct ifaddr *_ifa, int _cpu_id)
   {
           struct ifaddr_container *_ifac = &_ifa->ifa_containers[_cpu_id];
   
           crit_enter();
           ASSERT_IFAC_VALID(_ifac);
           ++_ifac->ifa_refcnt;
           crit_exit();
   }
   
   static __inline void
   IFAREF(struct ifaddr *_ifa)
   {
           _IFAREF(_ifa, mycpuid);
   }
   
   #include <sys/malloc.h>
   
   MALLOC_DECLARE(M_IFADDR);
   MALLOC_DECLARE(M_IFMADDR);
   MALLOC_DECLARE(M_IFNET);
   
   void    ifac_free(struct ifaddr_container *, int);
   
   static __inline void
   _IFAFREE(struct ifaddr *_ifa, int _cpu_id)
   {
           struct ifaddr_container *_ifac = &_ifa->ifa_containers[_cpu_id];
   
           crit_enter();
           ASSERT_IFAC_VALID(_ifac);
           if (--_ifac->ifa_refcnt == 0)
                   ifac_free(_ifac, _cpu_id);
           crit_exit();
   }
   
   static __inline void
   IFAFREE(struct ifaddr *_ifa)
   {
           _IFAFREE(_ifa, mycpuid);
   }
   
   struct lwkt_port *ifnet_portfn(int);
   int     ifnet_domsg(struct lwkt_msg *, int);
   void    ifnet_sendmsg(struct lwkt_msg *, int);
   void    ifnet_forwardmsg(struct lwkt_msg *, int);
   struct ifnet *ifnet_byindex(unsigned short);
   
   static __inline int
   ifa_domsg(struct lwkt_msg *_lmsg, int _cpu)
   {
           return ifnet_domsg(_lmsg, _cpu);
   }
   
   static __inline void
   ifa_sendmsg(struct lwkt_msg *_lmsg, int _cpu)
   {
           ifnet_sendmsg(_lmsg, _cpu);
   }
   
   static __inline void
   ifa_forwardmsg(struct lwkt_msg *_lmsg, int _nextcpu)
   {
           ifnet_forwardmsg(_lmsg, _nextcpu);
   }
   
   static __inline void
   ifnet_serialize_array_enter(lwkt_serialize_t *_arr, int _arrcnt,
       enum ifnet_serialize _slz)
   {
           KKASSERT(_slz == IFNET_SERIALIZE_ALL);
           lwkt_serialize_array_enter(_arr, _arrcnt, 0);
   }
   
   static __inline void
   ifnet_serialize_array_exit(lwkt_serialize_t *_arr, int _arrcnt,
       enum ifnet_serialize _slz)
   {
           KKASSERT(_slz == IFNET_SERIALIZE_ALL);
           lwkt_serialize_array_exit(_arr, _arrcnt, 0);
   }
   
   static __inline int
   ifnet_serialize_array_try(lwkt_serialize_t *_arr, int _arrcnt,
       enum ifnet_serialize _slz)
   {
           KKASSERT(_slz == IFNET_SERIALIZE_ALL);
           return lwkt_serialize_array_try(_arr, _arrcnt, 0);
   }
   
   #ifdef INVARIANTS
   
   static __inline void
   ifnet_serialize_array_assert(lwkt_serialize_t *_arr, int _arrcnt,
       enum ifnet_serialize _slz, boolean_t _serialized)
   {
           int _i;
   
           KKASSERT(_slz == IFNET_SERIALIZE_ALL);
           if (_serialized) {
                   for (_i = 0; _i < _arrcnt; ++_i)
                           ASSERT_SERIALIZED(_arr[_i]);
           } else {
                   for (_i = 0; _i < _arrcnt; ++_i)
                           ASSERT_NOT_SERIALIZED(_arr[_i]);
           }
   }
   
   #endif  /* INVARIANTS */
   
   #define REINPUT_KEEPRCVIF       0x0001  /* ether_reinput_oncpu() */
   #define REINPUT_RUNBPF          0x0002  /* ether_reinput_oncpu() */
   
   extern  struct ifnethead ifnet;
   extern struct   ifnet   **ifindex2ifnet;
   extern  int ifqmaxlen;
   extern  struct ifnet loif[];
   extern  int if_index;
   
   struct ip;
   struct tcphdr;
   
   void    ether_ifattach(struct ifnet *, const uint8_t *,
               struct lwkt_serialize *);
   void    ether_ifattach_bpf(struct ifnet *, const uint8_t *, u_int, u_int,
               struct lwkt_serialize *);
   void    ether_ifdetach(struct ifnet *);
   void    ether_demux(struct mbuf *);
   void    ether_demux_oncpu(struct ifnet *, struct mbuf *);
   void    ether_reinput_oncpu(struct ifnet *, struct mbuf *, int);
   void    ether_input_pkt(struct ifnet *, struct mbuf *, const struct pktinfo *);
   int     ether_output_frame(struct ifnet *, struct mbuf *);
   int     ether_ioctl(struct ifnet *, u_long, caddr_t);
   u_char  *kether_aton(const char *, u_char *);
   char    *kether_ntoa(const u_char *, char *);
   struct ifnet *ether_bridge_interface(struct ifnet *ifp);
   uint32_t        ether_crc32_le(const uint8_t *, size_t);
   uint32_t        ether_crc32_be(const uint8_t *, size_t);
   
   int     if_addmulti(struct ifnet *, struct sockaddr *, struct ifmultiaddr **);
   int     if_allmulti(struct ifnet *, int);
   void    if_attach(struct ifnet *, struct lwkt_serialize *);
   int     if_delmulti(struct ifnet *, struct sockaddr *);
   void    if_delallmulti(struct ifnet *ifp);
   void    if_purgeaddrs_nolink(struct ifnet *);
   void    if_detach(struct ifnet *);
   void    if_down(struct ifnet *);
   void    if_link_state_change(struct ifnet *);
   void    if_initname(struct ifnet *, const char *, int);
   int     if_getanyethermac(uint16_t *, int);
   int     if_printf(struct ifnet *, const char *, ...) __printflike(2, 3);
   struct ifnet *if_alloc(uint8_t);
   void    if_free(struct ifnet *);
   void    if_route(struct ifnet *, int flag, int fam);
   int     if_setlladdr(struct ifnet *, const u_char *, int);
   void    if_unroute(struct ifnet *, int flag, int fam);
   void    if_up(struct ifnet *);
   /*void  ifinit(void);*/ /* declared in systm.h for main() */
   int     ifioctl(struct socket *, u_long, caddr_t, struct ucred *);
   int     ifpromisc(struct ifnet *, int);
   struct  ifnet *ifunit(const char *);
   struct  ifnet *if_withname(struct sockaddr *);
   
   struct  ifg_group *if_creategroup(const char *);
   int     if_addgroup(struct ifnet *, const char *);
   int     if_delgroup(struct ifnet *, const char *);
   int     if_getgroup(caddr_t, struct ifnet *);
   int     if_getgroupmembers(caddr_t);
   
   struct  ifaddr *ifa_ifwithaddr(struct sockaddr *);
   struct  ifaddr *ifa_ifwithdstaddr(struct sockaddr *);
   struct  ifaddr *ifa_ifwithnet(struct sockaddr *);
   struct  ifaddr *ifa_ifwithroute(int, struct sockaddr *, struct sockaddr *);
   struct  ifaddr *ifaof_ifpforaddr(struct sockaddr *, struct ifnet *);
   
   typedef void *if_com_alloc_t(u_char type, struct ifnet *ifp);
   typedef void if_com_free_t(void *com, u_char type);
   void    if_register_com_alloc(u_char, if_com_alloc_t *a, if_com_free_t *);
   void    if_deregister_com_alloc(u_char);
   
   void    *ifa_create(int, int);
   void    ifa_destroy(struct ifaddr *);
   void    ifa_iflink(struct ifaddr *, struct ifnet *, int);
   void    ifa_ifunlink(struct ifaddr *, struct ifnet *);
   
   struct ifaddr *ifaddr_byindex(unsigned short);
   
   struct  ifmultiaddr *ifmaof_ifpforaddr(struct sockaddr *, struct ifnet *);
   int     if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen);
   void    if_devstart(struct ifnet *ifp); /* COMPAT */
   void    if_devstart_sched(struct ifnet *ifp); /* COMPAT */
   int     if_ring_count2(int cnt, int cnt_max);
   
   #define IF_LLSOCKADDR(ifp)                                              \
       ((struct sockaddr_dl *)(ifp)->if_lladdr->ifa_addr)
   #define IF_LLADDR(ifp)  LLADDR(IF_LLSOCKADDR(ifp))
   
   #ifdef IFPOLL_ENABLE
   int     ifpoll_register(struct ifnet *);
   int     ifpoll_deregister(struct ifnet *);
   #endif  /* IFPOLL_ENABLE */
   
   #endif /* _KERNEL */
   
   #endif /* !_NET_IF_VAR_H_ */

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