490 lines
16 KiB
C
490 lines
16 KiB
C
/*
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* From: @(#)if.h 8.1 (Berkeley) 6/10/93
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* $FreeBSD$
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*/
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#ifndef _NET_IF_VAR_H_
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#define _NET_IF_VAR_H_
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/*
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* Structures defining a network interface, providing a packet
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* transport mechanism (ala level 0 of the PUP protocols).
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*
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* Each interface accepts output datagrams of a specified maximum
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* length, and provides higher level routines with input datagrams
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* received from its medium.
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*
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* Output occurs when the routine if_output is called, with three parameters:
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* (*ifp->if_output)(ifp, m, dst, rt)
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* Here m is the mbuf chain to be sent and dst is the destination address.
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* The output routine encapsulates the supplied datagram if necessary,
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* and then transmits it on its medium.
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*
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* On input, each interface unwraps the data received by it, and either
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* places it on the input queue of an internetwork datagram routine
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* and posts the associated software interrupt, or passes the datagram to a raw
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* packet input routine.
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*
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* Routines exist for locating interfaces by their addresses
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* or for locating an interface on a certain network, as well as more general
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* routing and gateway routines maintaining information used to locate
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* interfaces. These routines live in the files if.c and route.c
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*/
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#ifdef __STDC__
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/*
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* Forward structure declarations for function prototypes [sic].
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*/
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struct mbuf;
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struct thread;
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struct rtentry;
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struct rt_addrinfo;
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struct socket;
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struct ether_header;
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#endif
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#include <sys/_label.h> /* struct label */
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#include <sys/queue.h> /* get TAILQ macros */
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#ifdef _KERNEL
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#include <sys/mbuf.h>
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#endif /* _KERNEL */
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#include <sys/lock.h> /* XXX */
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#include <sys/mutex.h> /* XXX */
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#include <sys/event.h> /* XXX */
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TAILQ_HEAD(ifnethead, ifnet); /* we use TAILQs so that the order of */
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TAILQ_HEAD(ifaddrhead, ifaddr); /* instantiation is preserved in the list */
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TAILQ_HEAD(ifprefixhead, ifprefix);
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TAILQ_HEAD(ifmultihead, ifmultiaddr);
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/*
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* Structure defining a queue for a network interface.
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*/
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struct ifqueue {
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struct mbuf *ifq_head;
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struct mbuf *ifq_tail;
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int ifq_len;
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int ifq_maxlen;
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int ifq_drops;
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struct mtx ifq_mtx;
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};
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/*
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* Structure defining a network interface.
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*
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* (Would like to call this struct ``if'', but C isn't PL/1.)
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*/
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/*
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* NB: For FreeBSD, it is assumed that each NIC driver's softc starts with
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* one of these structures, typically held within an arpcom structure.
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*
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* struct <foo>_softc {
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* struct arpcom {
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* struct ifnet ac_if;
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* ...
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* } <arpcom> ;
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* ...
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* };
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*
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* The assumption is used in a number of places, including many
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* files in sys/net, device drivers, and sys/dev/mii.c:miibus_attach().
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*
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* Unfortunately devices' softc are opaque, so we depend on this layout
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* to locate the struct ifnet from the softc in the generic code.
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*
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*/
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struct ifnet {
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void *if_softc; /* pointer to driver state */
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char *if_name; /* name, e.g. ``en'' or ``lo'' */
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TAILQ_ENTRY(ifnet) if_link; /* all struct ifnets are chained */
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struct ifaddrhead if_addrhead; /* linked list of addresses per if */
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struct klist if_klist; /* events attached to this if */
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int if_pcount; /* number of promiscuous listeners */
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struct bpf_if *if_bpf; /* packet filter structure */
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u_short if_index; /* numeric abbreviation for this if */
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short if_unit; /* sub-unit for lower level driver */
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short if_timer; /* time 'til if_watchdog called */
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u_short if_nvlans; /* number of active vlans */
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int if_flags; /* up/down, broadcast, etc. */
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int if_capabilities; /* interface capabilities */
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int if_capenable; /* enabled features */
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int if_ipending; /* interrupts pending */
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void *if_linkmib; /* link-type-specific MIB data */
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size_t if_linkmiblen; /* length of above data */
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struct if_data if_data;
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struct ifmultihead if_multiaddrs; /* multicast addresses configured */
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int if_amcount; /* number of all-multicast requests */
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/* procedure handles */
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int (*if_output) /* output routine (enqueue) */
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(struct ifnet *, struct mbuf *, struct sockaddr *,
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struct rtentry *);
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void (*if_input) /* input routine (from h/w driver) */
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(struct ifnet *, struct mbuf *);
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void (*if_start) /* initiate output routine */
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(struct ifnet *);
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int (*if_done) /* output complete routine */
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(struct ifnet *); /* (XXX not used; fake prototype) */
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int (*if_ioctl) /* ioctl routine */
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(struct ifnet *, u_long, caddr_t);
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void (*if_watchdog) /* timer routine */
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(struct ifnet *);
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int (*if_poll_recv) /* polled receive routine */
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(struct ifnet *, int *);
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int (*if_poll_xmit) /* polled transmit routine */
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(struct ifnet *, int *);
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void (*if_poll_intren) /* polled interrupt reenable routine */
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(struct ifnet *);
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void (*if_poll_slowinput) /* input routine for slow devices */
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(struct ifnet *, struct mbuf *);
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void (*if_init) /* Init routine */
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(void *);
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int (*if_resolvemulti) /* validate/resolve multicast */
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(struct ifnet *, struct sockaddr **, struct sockaddr *);
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struct ifqueue if_snd; /* output queue */
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struct ifqueue *if_poll_slowq; /* input queue for slow devices */
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struct ifprefixhead if_prefixhead; /* list of prefixes per if */
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u_int8_t *if_broadcastaddr; /* linklevel broadcast bytestring */
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struct label if_label; /* interface MAC label */
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};
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typedef void if_init_f_t(void *);
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#define if_mtu if_data.ifi_mtu
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#define if_type if_data.ifi_type
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#define if_physical if_data.ifi_physical
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#define if_addrlen if_data.ifi_addrlen
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#define if_hdrlen if_data.ifi_hdrlen
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#define if_metric if_data.ifi_metric
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#define if_baudrate if_data.ifi_baudrate
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#define if_hwassist if_data.ifi_hwassist
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#define if_ipackets if_data.ifi_ipackets
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#define if_ierrors if_data.ifi_ierrors
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#define if_opackets if_data.ifi_opackets
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#define if_oerrors if_data.ifi_oerrors
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#define if_collisions if_data.ifi_collisions
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#define if_ibytes if_data.ifi_ibytes
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#define if_obytes if_data.ifi_obytes
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#define if_imcasts if_data.ifi_imcasts
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#define if_omcasts if_data.ifi_omcasts
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#define if_iqdrops if_data.ifi_iqdrops
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#define if_noproto if_data.ifi_noproto
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#define if_lastchange if_data.ifi_lastchange
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#define if_recvquota if_data.ifi_recvquota
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#define if_xmitquota if_data.ifi_xmitquota
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#define if_rawoutput(if, m, sa) if_output(if, m, sa, (struct rtentry *)0)
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/* for compatibility with other BSDs */
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#define if_addrlist if_addrhead
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#define if_list if_link
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/*
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* Bit values in if_ipending
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*/
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#define IFI_RECV 1 /* I want to receive */
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#define IFI_XMIT 2 /* I want to transmit */
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/*
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* Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq)
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* are queues of messages stored on ifqueue structures
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* (defined above). Entries are added to and deleted from these structures
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* by these macros, which should be called with ipl raised to splimp().
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*/
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#define IF_LOCK(ifq) mtx_lock(&(ifq)->ifq_mtx)
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#define IF_UNLOCK(ifq) mtx_unlock(&(ifq)->ifq_mtx)
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#define _IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
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#define _IF_DROP(ifq) ((ifq)->ifq_drops++)
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#define _IF_QLEN(ifq) ((ifq)->ifq_len)
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#define _IF_ENQUEUE(ifq, m) do { \
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(m)->m_nextpkt = NULL; \
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if ((ifq)->ifq_tail == NULL) \
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(ifq)->ifq_head = m; \
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else \
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(ifq)->ifq_tail->m_nextpkt = m; \
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(ifq)->ifq_tail = m; \
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(ifq)->ifq_len++; \
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} while (0)
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#define IF_ENQUEUE(ifq, m) do { \
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IF_LOCK(ifq); \
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_IF_ENQUEUE(ifq, m); \
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IF_UNLOCK(ifq); \
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} while (0)
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#define _IF_PREPEND(ifq, m) do { \
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(m)->m_nextpkt = (ifq)->ifq_head; \
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if ((ifq)->ifq_tail == NULL) \
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(ifq)->ifq_tail = (m); \
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(ifq)->ifq_head = (m); \
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(ifq)->ifq_len++; \
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} while (0)
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#define IF_PREPEND(ifq, m) do { \
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IF_LOCK(ifq); \
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_IF_PREPEND(ifq, m); \
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IF_UNLOCK(ifq); \
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} while (0)
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#define _IF_DEQUEUE(ifq, m) do { \
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(m) = (ifq)->ifq_head; \
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if (m) { \
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if (((ifq)->ifq_head = (m)->m_nextpkt) == 0) \
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(ifq)->ifq_tail = NULL; \
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(m)->m_nextpkt = NULL; \
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(ifq)->ifq_len--; \
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} \
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} while (0)
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#define IF_DEQUEUE(ifq, m) do { \
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IF_LOCK(ifq); \
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_IF_DEQUEUE(ifq, m); \
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IF_UNLOCK(ifq); \
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} while (0)
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#define IF_DRAIN(ifq) do { \
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struct mbuf *m; \
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IF_LOCK(ifq); \
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for (;;) { \
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_IF_DEQUEUE(ifq, m); \
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if (m == NULL) \
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break; \
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m_freem(m); \
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} \
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IF_UNLOCK(ifq); \
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} while (0)
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#ifdef _KERNEL
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#define IF_HANDOFF(ifq, m, ifp) if_handoff(ifq, m, ifp, 0)
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#define IF_HANDOFF_ADJ(ifq, m, ifp, adj) if_handoff(ifq, m, ifp, adj)
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static __inline int
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if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust)
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{
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int active = 0;
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IF_LOCK(ifq);
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if (_IF_QFULL(ifq)) {
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_IF_DROP(ifq);
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IF_UNLOCK(ifq);
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m_freem(m);
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return (0);
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}
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if (ifp != NULL) {
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ifp->if_obytes += m->m_pkthdr.len + adjust;
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if (m->m_flags & M_MCAST)
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ifp->if_omcasts++;
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active = ifp->if_flags & IFF_OACTIVE;
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}
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_IF_ENQUEUE(ifq, m);
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IF_UNLOCK(ifq);
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if (ifp != NULL && !active)
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(*ifp->if_start)(ifp);
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return (1);
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}
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/*
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* 72 was chosen below because it is the size of a TCP/IP
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* header (40) + the minimum mss (32).
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*/
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#define IF_MINMTU 72
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#define IF_MAXMTU 65535
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#endif /* _KERNEL */
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/*
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* The ifaddr structure contains information about one address
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* of an interface. They are maintained by the different address families,
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* are allocated and attached when an address is set, and are linked
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* together so all addresses for an interface can be located.
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*/
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struct ifaddr {
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struct sockaddr *ifa_addr; /* address of interface */
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struct sockaddr *ifa_dstaddr; /* other end of p-to-p link */
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#define ifa_broadaddr ifa_dstaddr /* broadcast address interface */
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struct sockaddr *ifa_netmask; /* used to determine subnet */
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struct if_data if_data; /* not all members are meaningful */
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struct ifnet *ifa_ifp; /* back-pointer to interface */
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TAILQ_ENTRY(ifaddr) ifa_link; /* queue macro glue */
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void (*ifa_rtrequest) /* check or clean routes (+ or -)'d */
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(int, struct rtentry *, struct rt_addrinfo *);
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u_short ifa_flags; /* mostly rt_flags for cloning */
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u_int ifa_refcnt; /* references to this structure */
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int ifa_metric; /* cost of going out this interface */
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#ifdef notdef
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struct rtentry *ifa_rt; /* XXXX for ROUTETOIF ????? */
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#endif
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int (*ifa_claim_addr) /* check if an addr goes to this if */
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(struct ifaddr *, struct sockaddr *);
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struct mtx ifa_mtx;
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};
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#define IFA_ROUTE RTF_UP /* route installed */
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/* for compatibility with other BSDs */
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#define ifa_list ifa_link
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#define IFA_LOCK_INIT(ifa) \
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mtx_init(&(ifa)->ifa_mtx, "ifaddr", NULL, MTX_DEF)
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#define IFA_LOCK(ifa) mtx_lock(&(ifa)->ifa_mtx)
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#define IFA_UNLOCK(ifa) mtx_unlock(&(ifa)->ifa_mtx)
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#define IFA_DESTROY(ifa) mtx_destroy(&(ifa)->ifa_mtx)
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/*
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* The prefix structure contains information about one prefix
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* of an interface. They are maintained by the different address families,
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* are allocated and attached when a prefix or an address is set,
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* and are linked together so all prefixes for an interface can be located.
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*/
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struct ifprefix {
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struct sockaddr *ifpr_prefix; /* prefix of interface */
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struct ifnet *ifpr_ifp; /* back-pointer to interface */
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TAILQ_ENTRY(ifprefix) ifpr_list; /* queue macro glue */
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u_char ifpr_plen; /* prefix length in bits */
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u_char ifpr_type; /* protocol dependent prefix type */
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};
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/*
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* Multicast address structure. This is analogous to the ifaddr
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* structure except that it keeps track of multicast addresses.
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* Also, the reference count here is a count of requests for this
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* address, not a count of pointers to this structure.
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*/
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struct ifmultiaddr {
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TAILQ_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */
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struct sockaddr *ifma_addr; /* address this membership is for */
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struct sockaddr *ifma_lladdr; /* link-layer translation, if any */
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struct ifnet *ifma_ifp; /* back-pointer to interface */
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u_int ifma_refcount; /* reference count */
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void *ifma_protospec; /* protocol-specific state, if any */
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};
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#ifdef _KERNEL
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#define IFAFREE(ifa) \
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do { \
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IFA_LOCK(ifa); \
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KASSERT((ifa)->ifa_refcnt > 0, \
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("ifa %p !(ifa_refcnt > 0)", ifa)); \
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if (--(ifa)->ifa_refcnt == 0) { \
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IFA_DESTROY(ifa); \
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free(ifa, M_IFADDR); \
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} else \
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IFA_UNLOCK(ifa); \
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} while (0)
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#define IFAREF(ifa) \
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do { \
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IFA_LOCK(ifa); \
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++(ifa)->ifa_refcnt; \
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IFA_UNLOCK(ifa); \
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} while (0)
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extern struct mtx ifnet_lock;
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#define IFNET_LOCK_INIT() \
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mtx_init(&ifnet_lock, "ifnet", NULL, MTX_DEF | MTX_RECURSE)
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#define IFNET_WLOCK() mtx_lock(&ifnet_lock)
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#define IFNET_WUNLOCK() mtx_unlock(&ifnet_lock)
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#define IFNET_RLOCK() IFNET_WLOCK()
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#define IFNET_RUNLOCK() IFNET_WUNLOCK()
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struct ifindex_entry {
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struct ifnet *ife_ifnet;
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struct ifaddr *ife_ifnet_addr;
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dev_t ife_dev;
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};
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#define ifnet_byindex(idx) ifindex_table[(idx)].ife_ifnet
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#define ifaddr_byindex(idx) ifindex_table[(idx)].ife_ifnet_addr
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#define ifdev_byindex(idx) ifindex_table[(idx)].ife_dev
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extern struct ifnethead ifnet;
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extern struct ifindex_entry *ifindex_table;
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extern int ifqmaxlen;
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extern struct ifnet *loif; /* first loopback interface */
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extern int if_index;
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int if_addmulti(struct ifnet *, struct sockaddr *, struct ifmultiaddr **);
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int if_allmulti(struct ifnet *, int);
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void if_attach(struct ifnet *);
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int if_delmulti(struct ifnet *, struct sockaddr *);
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void if_detach(struct ifnet *);
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void if_down(struct ifnet *);
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int if_printf(struct ifnet *, const char *, ...) __printflike(2, 3);
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void if_route(struct ifnet *, int flag, int fam);
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int if_setlladdr(struct ifnet *, const u_char *, int);
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void if_unroute(struct ifnet *, int flag, int fam);
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void if_up(struct ifnet *);
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/*void ifinit(void);*/ /* declared in systm.h for main() */
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int ifioctl(struct socket *, u_long, caddr_t, struct thread *);
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int ifpromisc(struct ifnet *, int);
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struct ifnet *ifunit(const char *);
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struct ifnet *if_withname(struct sockaddr *);
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int if_poll_recv_slow(struct ifnet *ifp, int *quotap);
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void if_poll_xmit_slow(struct ifnet *ifp, int *quotap);
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void if_poll_throttle(void);
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void if_poll_unthrottle(void *);
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void if_poll_init(void);
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void if_poll(void);
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struct ifaddr *ifa_ifwithaddr(struct sockaddr *);
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struct ifaddr *ifa_ifwithdstaddr(struct sockaddr *);
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struct ifaddr *ifa_ifwithnet(struct sockaddr *);
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struct ifaddr *ifa_ifwithroute(int, struct sockaddr *, struct sockaddr *);
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struct ifaddr *ifaof_ifpforaddr(struct sockaddr *, struct ifnet *);
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struct ifmultiaddr *ifmaof_ifpforaddr(struct sockaddr *, struct ifnet *);
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int if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen);
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void if_clone_attach(struct if_clone *);
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void if_clone_detach(struct if_clone *);
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int if_clone_create(char *, int);
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int if_clone_destroy(const char *);
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#define IF_LLADDR(ifp) \
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LLADDR((struct sockaddr_dl *) ifaddr_byindex((ifp)->if_index)->ifa_addr)
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#ifdef DEVICE_POLLING
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enum poll_cmd { POLL_ONLY, POLL_AND_CHECK_STATUS, POLL_DEREGISTER };
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typedef void poll_handler_t(struct ifnet *ifp, enum poll_cmd cmd, int count);
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int ether_poll_register(poll_handler_t *h, struct ifnet *ifp);
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int ether_poll_deregister(struct ifnet *ifp);
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#endif /* DEVICE_POLLING */
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#endif /* _KERNEL */
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#endif /* !_NET_IF_VAR_H_ */
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