/* if.h 4.15 82/06/23 */ /* * 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.) * * EVENTUALLY PURGE if_net AND if_host FROM STRUCTURE */ 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 */ u_long if_net; /* network number of interface */ short if_flags; /* up/down, broadcast, etc. */ short if_timer; /* time 'til if_watchdog called */ u_long if_host[2]; /* local net host number */ struct sockaddr if_addr; /* address of interface */ union { struct sockaddr ifu_broadaddr; struct sockaddr ifu_dstaddr; } if_ifu; #define if_broadaddr if_ifu.ifu_broadaddr /* broadcast address */ #define if_dstaddr if_ifu.ifu_dstaddr /* other end of p-to-p link */ 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_ubareset)(); /* uba reset routine */ int (*if_watchdog)(); /* timer routine */ /* generic interface statistics */ long if_ipackets; /* packets received on interface */ long if_ierrors; /* input errors on interface */ long if_opackets; /* packets sent on interface */ long if_oerrors; /* output errors on interface */ long if_collisions; /* collisions on csma interfaces */ /* end statistics */ struct ifnet *if_next; }; #define IFF_UP 0x1 /* interface is up */ #define IFF_BROADCAST 0x2 /* broadcast address valid */ #define IFF_DEBUG 0x4 /* turn on debugging */ #define IFF_ROUTE 0x8 /* routing entry installed */ #define IFF_POINTOPOINT 0x10 /* interface is point-to-point link */ #define IFF_NOTRAILERS 0x20 /* avoid use of trailers */ #define IFF_RUNNING 0x40 /* resources allocated */ /* * 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++; \ } #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--; \ } \ } #if vax #define IFQ_MAXLEN 50 #endif #if pdp11 #define IFQ_MAXLEN 15 #endif #define IFNET_SLOWHZ 1 /* granularity is 1 second */ /* * 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; short ifru_flags; caddr_t ifru_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_flags ifr_ifru.ifru_flags /* flags */ #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 #ifdef INET struct ifqueue ipintrq; /* ip packet input queue */ #endif struct ifqueue rawintrq; /* raw packet input queue */ struct ifnet *ifnet; struct ifnet *if_ifwithaddr(), *if_ifwithnet(), *if_ifwithaf(); struct ifnet *if_ifonnetof(); struct in_addr if_mkaddr(); #define if_makeaddr(n,h) (if_mkaddr((u_long)n,(u_long)h)) #endif