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- /* @(#)if.h 1.23 88/02/08 SMI; from UCB 7.1 6/4/86 */
-
- /*
- * Copyright (c) 1982, 1986 Regents of the University of California.
- * All rights reserved. The Berkeley software License Agreement
- * specifies the terms and conditions for redistribution.
- */
-
- #ifndef net_if_h
- #define net_if_h
-
- /*
- * 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 three parameters:
- * (*ifp->if_output)(ifp, m, dst)
- * 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 a raw
- * packet input routine.
- *
- * 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
- */
-
- /*
- * Structure defining a queue for a network interface.
- *
- * (Would like to call this struct ``if'', but C isn't PL/1.)
- */
- struct ifnet {
- char *if_name; /* name, e.g. ``en'' or ``lo'' */
- short if_unit; /* sub-unit for lower level driver */
- short if_mtu; /* maximum transmission unit */
- short if_flags; /* up/down, broadcast, etc. */
- short if_timer; /* time 'til if_watchdog called */
- u_short if_promisc; /* net # of requests for promisc mode */
- int if_metric; /* routing metric (external only) */
- struct ifaddr *if_addrlist; /* linked list of addresses per if */
- struct ifqueue {
- struct mbuf *ifq_head;
- struct mbuf *ifq_tail;
- int ifq_len;
- int ifq_maxlen;
- int ifq_drops;
- } if_snd; /* output queue */
- /* procedure handles */
- int (*if_init)(); /* init routine */
- int (*if_output)(); /* output routine */
- int (*if_ioctl)(); /* ioctl routine */
- int (*if_reset)(); /* bus reset routine */
- int (*if_watchdog)(); /* timer routine */
- /* generic interface statistics */
- int if_ipackets; /* packets received on interface */
- int if_ierrors; /* input errors on interface */
- int if_opackets; /* packets sent on interface */
- int if_oerrors; /* output errors on interface */
- int if_collisions; /* collisions on csma interfaces */
- /* end statistics */
- struct ifnet *if_next;
- struct ifnet *if_upper; /* next layer up */
- struct ifnet *if_lower; /* next layer down */
- int (*if_input)(); /* input routine */
- int (*if_ctlin)(); /* control input routine */
- int (*if_ctlout)(); /* control output routine */
- #ifdef sun
- struct map *if_memmap; /* rmap for interface specific memory */
- #endif
- };
-
- #define IFF_UP 0x1 /* interface is up */
- #define IFF_BROADCAST 0x2 /* broadcast address valid */
- #define IFF_DEBUG 0x4 /* turn on debugging */
- #define IFF_LOOPBACK 0x8 /* is a loopback net */
- #define IFF_POINTOPOINT 0x10 /* interface is point-to-point link */
- #define IFF_NOTRAILERS 0x20 /* avoid use of trailers */
- #define IFF_RUNNING 0x40 /* resources allocated */
- #define IFF_NOARP 0x80 /* no address resolution protocol */
- #define IFF_PROMISC 0x100 /* receive all packets */
- #define IFF_ALLMULTI 0x200 /* receive all multicast packets */
- #define IFF_PRIVATE 0x8000 /* do not advertise */
-
- /* flags set internally only: */
- #define IFF_CANTCHANGE \
- (IFF_BROADCAST | IFF_POINTOPOINT | IFF_RUNNING | IFF_PROMISC)
-
- /*
- * Output queues (ifp->if_snd) and internetwork datagram level (pup level 1)
- * input routines have queues of messages stored on ifqueue structures
- * (defined above). Entries are added to and deleted from these structures
- * by these macros, which should be called with ipl raised to splimp().
- */
- #define IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
- #define IF_DROP(ifq) ((ifq)->ifq_drops++)
- #define IF_ENQUEUE(ifq, m) { \
- (m)->m_act = 0; \
- if ((ifq)->ifq_tail == 0) \
- (ifq)->ifq_head = m; \
- else \
- (ifq)->ifq_tail->m_act = m; \
- (ifq)->ifq_tail = m; \
- (ifq)->ifq_len++; \
- }
- #define IF_PREPEND(ifq, m) { \
- (m)->m_act = (ifq)->ifq_head; \
- if ((ifq)->ifq_tail == 0) \
- (ifq)->ifq_tail = (m); \
- (ifq)->ifq_head = (m); \
- (ifq)->ifq_len++; \
- }
- /*
- * Packets destined for level-1 protocol input routines
- * have a pointer to the receiving interface prepended to the data.
- * IF_DEQUEUEIF extracts and returns this pointer when dequeueing the packet.
- * IF_ADJ should be used otherwise to adjust for its presence.
- */
- #define IF_ADJ(m) { \
- (m)->m_off += sizeof(struct ifnet *); \
- (m)->m_len -= sizeof(struct ifnet *); \
- if ((m)->m_len == 0) { \
- struct mbuf *n; \
- MFREE((m), n); \
- (m) = n; \
- } \
- }
- #define IF_DEQUEUEIF(ifq, m, ifp) { \
- (m) = (ifq)->ifq_head; \
- if (m) { \
- if (((ifq)->ifq_head = (m)->m_act) == 0) \
- (ifq)->ifq_tail = 0; \
- (m)->m_act = 0; \
- (ifq)->ifq_len--; \
- (ifp) = *(mtod((m), struct ifnet **)); \
- IF_ADJ(m); \
- } \
- }
- #define IF_DEQUEUE(ifq, m) { \
- (m) = (ifq)->ifq_head; \
- if (m) { \
- if (((ifq)->ifq_head = (m)->m_act) == 0) \
- (ifq)->ifq_tail = 0; \
- (m)->m_act = 0; \
- (ifq)->ifq_len--; \
- } \
- }
-
- #define IFQ_MAXLEN 50
- #define IFNET_SLOWHZ 1 /* granularity is 1 second */
-
- /*
- * 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.
- */
- struct ifaddr {
- struct sockaddr ifa_addr; /* address of interface */
- union {
- struct sockaddr ifu_broadaddr;
- struct sockaddr ifu_dstaddr;
- } ifa_ifu;
- #define ifa_broadaddr ifa_ifu.ifu_broadaddr /* broadcast address */
- #define ifa_dstaddr ifa_ifu.ifu_dstaddr /* other end of p-to-p link */
- struct ifnet *ifa_ifp; /* back-pointer to interface */
- struct ifaddr *ifa_next; /* next address for interface */
- };
-
- /*
- * Interface request structure used for socket
- * ioctl's. All interface ioctl's must have parameter
- * definitions which begin with ifr_name. The
- * remainder may be interface specific.
- */
- struct ifreq {
- #define IFNAMSIZ 16
- char ifr_name[IFNAMSIZ]; /* if name, e.g. "en0" */
- union {
- struct sockaddr ifru_addr;
- struct sockaddr ifru_dstaddr;
- char ifru_oname[IFNAMSIZ]; /* other if name */
- struct sockaddr ifru_broadaddr;
- short ifru_flags;
- int ifru_metric;
- char ifru_data[1]; /* interface dependent data */
- } ifr_ifru;
- #define ifr_addr ifr_ifru.ifru_addr /* address */
- #define ifr_dstaddr ifr_ifru.ifru_dstaddr /* other end of p-to-p link */
- #define ifr_oname ifr_ifru.ifru_oname /* other if name */
- #define ifr_broadaddr ifr_ifru.ifru_broadaddr /* broadcast address */
- #define ifr_flags ifr_ifru.ifru_flags /* flags */
- #define ifr_metric ifr_ifru.ifru_metric /* metric */
- #define ifr_data ifr_ifru.ifru_data /* for use by interface */
- };
-
- /*
- * Structure used in SIOCGIFCONF request.
- * Used to retrieve interface configuration
- * for machine (useful for programs which
- * must know all networks accessible).
- */
- struct ifconf {
- int ifc_len; /* size of associated buffer */
- union {
- caddr_t ifcu_buf;
- struct ifreq *ifcu_req;
- } ifc_ifcu;
- #define ifc_buf ifc_ifcu.ifcu_buf /* buffer address */
- #define ifc_req ifc_ifcu.ifcu_req /* array of structures returned */
- };
-
- #ifdef KERNEL
- struct ifqueue rawintrq; /* raw packet input queue */
- struct ifnet *ifnet;
- struct ifaddr *ifa_ifwithaddr(), *ifa_ifwithnet();
- struct ifaddr *ifa_ifwithdstaddr();
- struct ifaddr *ifa_ifwithaf();
- struct ifnet *ifunit();
- #endif KERNEL
-
- #endif net_if_h
-