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Annotation of 42BSD/sys/net/if.h, revision 1.1

1.1     ! root        1: /*     if.h    6.2     83/08/28        */
        !             2: 
        !             3: /*
        !             4:  * Structures defining a network interface, providing a packet
        !             5:  * transport mechanism (ala level 0 of the PUP protocols).
        !             6:  *
        !             7:  * Each interface accepts output datagrams of a specified maximum
        !             8:  * length, and provides higher level routines with input datagrams
        !             9:  * received from its medium.
        !            10:  *
        !            11:  * Output occurs when the routine if_output is called, with three parameters:
        !            12:  *     (*ifp->if_output)(ifp, m, dst)
        !            13:  * Here m is the mbuf chain to be sent and dst is the destination address.
        !            14:  * The output routine encapsulates the supplied datagram if necessary,
        !            15:  * and then transmits it on its medium.
        !            16:  *
        !            17:  * On input, each interface unwraps the data received by it, and either
        !            18:  * places it on the input queue of a internetwork datagram routine
        !            19:  * and posts the associated software interrupt, or passes the datagram to a raw
        !            20:  * packet input routine.
        !            21:  *
        !            22:  * Routines exist for locating interfaces by their addresses
        !            23:  * or for locating a interface on a certain network, as well as more general
        !            24:  * routing and gateway routines maintaining information used to locate
        !            25:  * interfaces.  These routines live in the files if.c and route.c
        !            26:  */
        !            27: 
        !            28: /*
        !            29:  * Structure defining a queue for a network interface.
        !            30:  *
        !            31:  * (Would like to call this struct ``if'', but C isn't PL/1.)
        !            32:  *
        !            33:  * EVENTUALLY PURGE if_net AND if_host FROM STRUCTURE
        !            34:  */
        !            35: struct ifnet {
        !            36:        char    *if_name;               /* name, e.g. ``en'' or ``lo'' */
        !            37:        short   if_unit;                /* sub-unit for lower level driver */
        !            38:        short   if_mtu;                 /* maximum transmission unit */
        !            39:        int     if_net;                 /* network number of interface */
        !            40:        short   if_flags;               /* up/down, broadcast, etc. */
        !            41:        short   if_timer;               /* time 'til if_watchdog called */
        !            42:        int     if_host[2];             /* local net host number */
        !            43:        struct  sockaddr if_addr;       /* address of interface */
        !            44:        union {
        !            45:                struct  sockaddr ifu_broadaddr;
        !            46:                struct  sockaddr ifu_dstaddr;
        !            47:        } if_ifu;
        !            48: #define        if_broadaddr    if_ifu.ifu_broadaddr    /* broadcast address */
        !            49: #define        if_dstaddr      if_ifu.ifu_dstaddr      /* other end of p-to-p link */
        !            50:        struct  ifqueue {
        !            51:                struct  mbuf *ifq_head;
        !            52:                struct  mbuf *ifq_tail;
        !            53:                int     ifq_len;
        !            54:                int     ifq_maxlen;
        !            55:                int     ifq_drops;
        !            56:        } if_snd;                       /* output queue */
        !            57: /* procedure handles */
        !            58:        int     (*if_init)();           /* init routine */
        !            59:        int     (*if_output)();         /* output routine */
        !            60:        int     (*if_ioctl)();          /* ioctl routine */
        !            61:        int     (*if_reset)();          /* bus reset routine */
        !            62:        int     (*if_watchdog)();       /* timer routine */
        !            63: /* generic interface statistics */
        !            64:        int     if_ipackets;            /* packets received on interface */
        !            65:        int     if_ierrors;             /* input errors on interface */
        !            66:        int     if_opackets;            /* packets sent on interface */
        !            67:        int     if_oerrors;             /* output errors on interface */
        !            68:        int     if_collisions;          /* collisions on csma interfaces */
        !            69: /* end statistics */
        !            70:        struct  ifnet *if_next;
        !            71: };
        !            72: 
        !            73: #define        IFF_UP          0x1             /* interface is up */
        !            74: #define        IFF_BROADCAST   0x2             /* broadcast address valid */
        !            75: #define        IFF_DEBUG       0x4             /* turn on debugging */
        !            76: #define        IFF_ROUTE       0x8             /* routing entry installed */
        !            77: #define        IFF_POINTOPOINT 0x10            /* interface is point-to-point link */
        !            78: #define        IFF_NOTRAILERS  0x20            /* avoid use of trailers */
        !            79: #define        IFF_RUNNING     0x40            /* resources allocated */
        !            80: #define        IFF_NOARP       0x80            /* no address resolution protocol */
        !            81: 
        !            82: /*
        !            83:  * Output queues (ifp->if_snd) and internetwork datagram level (pup level 1)
        !            84:  * input routines have queues of messages stored on ifqueue structures
        !            85:  * (defined above).  Entries are added to and deleted from these structures
        !            86:  * by these macros, which should be called with ipl raised to splimp().
        !            87:  */
        !            88: #define        IF_QFULL(ifq)           ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
        !            89: #define        IF_DROP(ifq)            ((ifq)->ifq_drops++)
        !            90: #define        IF_ENQUEUE(ifq, m) { \
        !            91:        (m)->m_act = 0; \
        !            92:        if ((ifq)->ifq_tail == 0) \
        !            93:                (ifq)->ifq_head = m; \
        !            94:        else \
        !            95:                (ifq)->ifq_tail->m_act = m; \
        !            96:        (ifq)->ifq_tail = m; \
        !            97:        (ifq)->ifq_len++; \
        !            98: }
        !            99: #define        IF_PREPEND(ifq, m) { \
        !           100:        (m)->m_act = (ifq)->ifq_head; \
        !           101:        if ((ifq)->ifq_tail == 0) \
        !           102:                (ifq)->ifq_tail = (m); \
        !           103:        (ifq)->ifq_head = (m); \
        !           104:        (ifq)->ifq_len++; \
        !           105: }
        !           106: #define        IF_DEQUEUE(ifq, m) { \
        !           107:        (m) = (ifq)->ifq_head; \
        !           108:        if (m) { \
        !           109:                if (((ifq)->ifq_head = (m)->m_act) == 0) \
        !           110:                        (ifq)->ifq_tail = 0; \
        !           111:                (m)->m_act = 0; \
        !           112:                (ifq)->ifq_len--; \
        !           113:        } \
        !           114: }
        !           115: 
        !           116: #define        IFQ_MAXLEN      50
        !           117: #define        IFNET_SLOWHZ    1               /* granularity is 1 second */
        !           118: 
        !           119: /*
        !           120:  * Interface request structure used for socket
        !           121:  * ioctl's.  All interface ioctl's must have parameter
        !           122:  * definitions which begin with ifr_name.  The
        !           123:  * remainder may be interface specific.
        !           124:  */
        !           125: struct ifreq {
        !           126: #define        IFNAMSIZ        16
        !           127:        char    ifr_name[IFNAMSIZ];             /* if name, e.g. "en0" */
        !           128:        union {
        !           129:                struct  sockaddr ifru_addr;
        !           130:                struct  sockaddr ifru_dstaddr;
        !           131:                short   ifru_flags;
        !           132:                caddr_t ifru_data;
        !           133:        } ifr_ifru;
        !           134: #define        ifr_addr        ifr_ifru.ifru_addr      /* address */
        !           135: #define        ifr_dstaddr     ifr_ifru.ifru_dstaddr   /* other end of p-to-p link */
        !           136: #define        ifr_flags       ifr_ifru.ifru_flags     /* flags */
        !           137: #define        ifr_data        ifr_ifru.ifru_data      /* for use by interface */
        !           138: };
        !           139: 
        !           140: /*
        !           141:  * Structure used in SIOCGIFCONF request.
        !           142:  * Used to retrieve interface configuration
        !           143:  * for machine (useful for programs which
        !           144:  * must know all networks accessible).
        !           145:  */
        !           146: struct ifconf {
        !           147:        int     ifc_len;                /* size of associated buffer */
        !           148:        union {
        !           149:                caddr_t ifcu_buf;
        !           150:                struct  ifreq *ifcu_req;
        !           151:        } ifc_ifcu;
        !           152: #define        ifc_buf ifc_ifcu.ifcu_buf       /* buffer address */
        !           153: #define        ifc_req ifc_ifcu.ifcu_req       /* array of structures returned */
        !           154: };
        !           155: 
        !           156: #ifdef KERNEL
        !           157: #ifdef INET
        !           158: struct ifqueue ipintrq;                /* ip packet input queue */
        !           159: #endif
        !           160: struct ifqueue rawintrq;               /* raw packet input queue */
        !           161: struct ifnet *ifnet;
        !           162: struct ifnet *if_ifwithaddr(), *if_ifwithnet(), *if_ifwithaf();
        !           163: struct ifnet *if_ifonnetof();
        !           164: struct in_addr if_makeaddr();
        !           165: #endif

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