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ETHERSUBR(9)               Kernel Developer's Manual              ETHERSUBR(9)

     ethersubr, ether_ifattach, ether_addmulti, ether_delmulti,
     fddi_addmulti, fddi_delmulti - Ethernet and FDDI driver support functions
     and macros

     #include <net/if_ether.h>

     ether_ifattach(struct ifnet *ifp, uint8_t *lla);

     ether_addmulti(const struct sockaddr *sa, struct ethercom *ec);

     ether_delmulti(const struct sockaddr *sa, struct ethercom *ec);

     ETHER_FIRST_MULTI(struct ether_multistep step, struct ethercom *ec,
         struct ether_multi *enm);

     ETHER_NEXT_MULTI(struct ether_multistep step, struct ether_multi *enm);

     ETHER_IS_MULTICAST(uint8_t *addr);

     #include <net/if_fddi.h>

     fddi_ifattach(struct ifnet *ifp, uint8_t *lla);

     fddi_addmulti(const struct sockaddr *sa, struct ethercom *ec);

     fddi_delmulti(const struct sockaddr *sa, struct ethercom *ec);

     The ethersubr functions provide the interface between the ethersubr
     module and the network drivers which need Ethernet support.  Such drivers
     must request the ether attribute in their files declaration and call the
     appropriate functions as specified below.

     FDDI drivers must request the "fddi" attribute in their "files"
     declaration and call the functions tagged with "fddi_" or "FDDI_"
     instead, where different.  Some macros are shared.

     Note that you also need the arp(9) stuff to support IPv4 on your

     ether_ifattach(ifp, lla)
              Perform the device-independent, but Ethernet-specific
              initialization of the interface pointed to by ifp.

              Among other duties, this function creates a record for the link
              level address in the interface's address list and records the
              link level address pointed to by lla there.  Drivers can
              initialize the link level address by themselves by calling the
              function with lla as NULL and calling if_set_sadl().

              This function must be called from the driver's attach function.

     fddi_ifattach(ifp, lla)
              Corresponding function for FDDI devices.

     ether_addmulti(sa, ec)

     ether_delmulti(sa, ec)
              Add (ether_addmulti()) or delete (ether_delmulti()) the address
              described by the sa pointer to the Ethernet multicast list
              belonging to ec.

              These functions must be called from the driver's ioctl function
              to handle SIOCADDMULTI and SIOCDELMULTI requests.  If these
              return ENETRESET, the hardware multicast filter must be

              These functions accept AF_UNSPEC addresses, which are
              interpreted as Ethernet addresses, or AF_INET addresses.  In the
              latter case, INADDR_ANY is mapped to a range describing all the
              Ethernet address space reserved for IPv4 multicast addresses.

              The ether_addmulti() returns EAFNOSUPPORT if an unsupported
              address family is specified, EINVAL if a non-multicast address
              is specified, or ENETRESET if the multicast list really changed
              and the driver should synchronize its hardware filter with it.

              The ether_delmulti() returns, in addition to the above errors,
              ENXIO if the specified address can't be found in the list of
              multicast addresses.

     fddi_addmulti(sa, ec)

     fddi_delmulti(sa, ec)
              Corresponding functions for FDDI devices.

     ETHER_NEXT_MULTI(step, enm)
              A macro to step through all of the ether_multi records, one at a
              time.  The current position is remembered in step, which the
              caller must provide.

     ETHER_FIRST_MULTI(step, ec, enm)
              A macro that must be called to initialize step and get the first
              record.  Both macros return a NULL enm when there are no
              remaining records.

              A macro that returns 1, if addr points to an Ethernet/FDDI
              multicast (or broadcast) address.

     Ethernet support functions are declared in <net/if_ether.h> and defined
     (if not implemented as macro) in sys/net/if_ethersubr.c.

     FDDI support functions are declared in <net/if_fddi.h> and defined (if
     not implemented as macro) in sys/net/if_fddisubr.c.


     Rewritten to attach to the new ARP system in NetBSD 1.3.

     UCB CSRG (original implementation)

     Ignatios Souvatzis (support for new ARP system)

NetBSD 8.99.34                 December 28, 2016                NetBSD 8.99.34