292ee7be1c
and move both flags from ifnet.if_flags to ifnet.if_drv_flags, making and documenting the locking of these flags the responsibility of the device driver, not the network stack. The flags for these two fields will be mutually exclusive so that they can be exposed to user space as though they were stored in the same variable. Provide #defines to provide the old names #ifndef _KERNEL, so that user applications (such as ifconfig) can use the old flag names. Using the old names in a device driver will result in a compile error in order to help device driver writers adopt the new model. When exposing the interface flags to user space, via interface ioctls or routing sockets, or the two fields together. Since the driver flags cannot currently be set for user space, no new logic is currently required to handle this case. Add some assertions that general purpose network stack routines, such as if_setflags(), are not improperly used on driver-owned flags. With this change, a large number of very minor network stack races are closed, subject to correct device driver locking. Most were likely never triggered. Driver sweep to follow; many thanks to pjd and bz for the line-by-line review they gave this patch. Reviewed by: pjd, bz MFC after: 7 days
673 lines
22 KiB
C
673 lines
22 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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* 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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struct carp_if;
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#endif
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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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#include <sys/eventhandler.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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#include <sys/_task.h>
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#define IF_DUNIT_NONE -1
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#include <altq/if_altq.h>
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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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struct ifnet {
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void *if_softc; /* pointer to driver state */
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void *if_l2com; /* pointer to protocol bits */
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TAILQ_ENTRY(ifnet) if_link; /* all struct ifnets are chained */
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char if_xname[IFNAMSIZ]; /* external name (name + unit) */
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const char *if_dname; /* driver name */
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int if_dunit; /* unit or IF_DUNIT_NONE */
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struct ifaddrhead if_addrhead; /* linked list of addresses per if */
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/*
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* if_addrhead is the list of all addresses associated to
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* an interface.
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* Some code in the kernel assumes that first element
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* of the list has type AF_LINK, and contains sockaddr_dl
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* addresses which store the link-level address and the name
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* of the interface.
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* However, access to the AF_LINK address through this
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* field is deprecated. Use ifaddr_byindex() instead.
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*/
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struct knlist if_klist; /* events attached to this if */
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int if_pcount; /* number of promiscuous listeners */
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struct carp_if *if_carp; /* carp interface structure */
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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_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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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_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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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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void *if_spare1; /* spare pointer 1 */
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void *if_spare2; /* spare pointer 2 */
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void *if_spare3; /* spare pointer 3 */
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int if_drv_flags; /* driver-managed status flags */
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u_int if_spare_flags2; /* spare flags 2 */
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struct ifaltq if_snd; /* output queue (includes altq) */
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const u_int8_t *if_broadcastaddr; /* linklevel broadcast bytestring */
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void *if_bridge; /* bridge glue */
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struct lltable *lltables; /* list of L3-L2 resolution tables */
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struct label *if_label; /* interface MAC label */
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/* these are only used by IPv6 */
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struct ifprefixhead if_prefixhead; /* list of prefixes per if */
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void *if_afdata[AF_MAX];
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int if_afdata_initialized;
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struct mtx if_afdata_mtx;
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struct task if_starttask; /* task for IFF_NEEDSGIANT */
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struct task if_linktask; /* task for link change events */
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struct mtx if_addr_mtx; /* mutex to protect address lists */
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};
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typedef void if_init_f_t(void *);
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/*
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* XXX These aliases are terribly dangerous because they could apply
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* to anything.
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*/
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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_link_state if_data.ifi_link_state
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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 *)NULL)
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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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* Locks for address lists on the network interface.
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*/
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#define IF_ADDR_LOCK_INIT(if) mtx_init(&(if)->if_addr_mtx, \
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"if_addr_mtx", NULL, MTX_DEF)
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#define IF_ADDR_LOCK_DESTROY(if) mtx_destroy(&(if)->if_addr_mtx)
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#define IF_ADDR_LOCK(if) mtx_lock(&(if)->if_addr_mtx)
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#define IF_ADDR_UNLOCK(if) mtx_unlock(&(if)->if_addr_mtx)
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#define IF_ADDR_LOCK_ASSERT(if) mtx_assert(&(if)->if_addr_mtx, MA_OWNED)
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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_LOCK_ASSERT(ifq) mtx_assert(&(ifq)->ifq_mtx, MA_OWNED)
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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) == NULL) \
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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_POLL(ifq, m) ((m) = (ifq)->ifq_head)
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#define IF_POLL(ifq, m) _IF_POLL(ifq, m)
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#define _IF_DRAIN(ifq) do { \
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struct mbuf *m; \
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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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} while (0)
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#define IF_DRAIN(ifq) do { \
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IF_LOCK(ifq); \
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_IF_DRAIN(ifq); \
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IF_UNLOCK(ifq); \
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} while(0)
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#ifdef _KERNEL
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/* interface address change event */
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typedef void (*ifaddr_event_handler_t)(void *, struct ifnet *);
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EVENTHANDLER_DECLARE(ifaddr_event, ifaddr_event_handler_t);
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/* new interface arrival event */
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typedef void (*ifnet_arrival_event_handler_t)(void *, struct ifnet *);
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EVENTHANDLER_DECLARE(ifnet_arrival_event, ifnet_arrival_event_handler_t);
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/* interface departure event */
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typedef void (*ifnet_departure_event_handler_t)(void *, struct ifnet *);
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EVENTHANDLER_DECLARE(ifnet_departure_event, ifnet_departure_event_handler_t);
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#define IF_AFDATA_LOCK_INIT(ifp) \
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mtx_init(&(ifp)->if_afdata_mtx, "if_afdata", NULL, MTX_DEF)
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#define IF_AFDATA_LOCK(ifp) mtx_lock(&(ifp)->if_afdata_mtx)
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#define IF_AFDATA_TRYLOCK(ifp) mtx_trylock(&(ifp)->if_afdata_mtx)
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#define IF_AFDATA_UNLOCK(ifp) mtx_unlock(&(ifp)->if_afdata_mtx)
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#define IF_AFDATA_DESTROY(ifp) mtx_destroy(&(ifp)->if_afdata_mtx)
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#define IFF_LOCKGIANT(ifp) do { \
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if ((ifp)->if_flags & IFF_NEEDSGIANT) \
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mtx_lock(&Giant); \
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} while (0)
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#define IFF_UNLOCKGIANT(ifp) do { \
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if ((ifp)->if_flags & IFF_NEEDSGIANT) \
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mtx_unlock(&Giant); \
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} while (0)
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int if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp,
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int adjust);
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#define IF_HANDOFF(ifq, m, ifp) \
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if_handoff((struct ifqueue *)ifq, m, ifp, 0)
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#define IF_HANDOFF_ADJ(ifq, m, ifp, adj) \
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if_handoff((struct ifqueue *)ifq, m, ifp, adj)
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void if_start(struct ifnet *);
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#define IFQ_ENQUEUE(ifq, m, err) \
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do { \
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IF_LOCK(ifq); \
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if (ALTQ_IS_ENABLED(ifq)) \
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ALTQ_ENQUEUE(ifq, m, NULL, err); \
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else { \
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if (_IF_QFULL(ifq)) { \
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m_freem(m); \
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(err) = ENOBUFS; \
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} else { \
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_IF_ENQUEUE(ifq, m); \
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(err) = 0; \
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} \
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} \
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if (err) \
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(ifq)->ifq_drops++; \
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IF_UNLOCK(ifq); \
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} while (0)
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#define IFQ_DEQUEUE_NOLOCK(ifq, m) \
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do { \
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if (TBR_IS_ENABLED(ifq)) \
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(m) = tbr_dequeue_ptr(ifq, ALTDQ_REMOVE); \
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else if (ALTQ_IS_ENABLED(ifq)) \
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ALTQ_DEQUEUE(ifq, m); \
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else \
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_IF_DEQUEUE(ifq, m); \
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} while (0)
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#define IFQ_DEQUEUE(ifq, m) \
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do { \
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IF_LOCK(ifq); \
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IFQ_DEQUEUE_NOLOCK(ifq, m); \
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IF_UNLOCK(ifq); \
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} while (0)
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#define IFQ_POLL_NOLOCK(ifq, m) \
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do { \
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if (TBR_IS_ENABLED(ifq)) \
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(m) = tbr_dequeue_ptr(ifq, ALTDQ_POLL); \
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else if (ALTQ_IS_ENABLED(ifq)) \
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ALTQ_POLL(ifq, m); \
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else \
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_IF_POLL(ifq, m); \
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} while (0)
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#define IFQ_POLL(ifq, m) \
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do { \
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IF_LOCK(ifq); \
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IFQ_POLL_NOLOCK(ifq, m); \
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IF_UNLOCK(ifq); \
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} while (0)
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#define IFQ_PURGE_NOLOCK(ifq) \
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do { \
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if (ALTQ_IS_ENABLED(ifq)) { \
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ALTQ_PURGE(ifq); \
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} else \
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_IF_DRAIN(ifq); \
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} while (0)
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#define IFQ_PURGE(ifq) \
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do { \
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IF_LOCK(ifq); \
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IFQ_PURGE_NOLOCK(ifq); \
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IF_UNLOCK(ifq); \
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} while (0)
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#define IFQ_SET_READY(ifq) \
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do { ((ifq)->altq_flags |= ALTQF_READY); } while (0)
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#define IFQ_LOCK(ifq) IF_LOCK(ifq)
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#define IFQ_UNLOCK(ifq) IF_UNLOCK(ifq)
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#define IFQ_LOCK_ASSERT(ifq) IF_LOCK_ASSERT(ifq)
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#define IFQ_IS_EMPTY(ifq) ((ifq)->ifq_len == 0)
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#define IFQ_INC_LEN(ifq) ((ifq)->ifq_len++)
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#define IFQ_DEC_LEN(ifq) (--(ifq)->ifq_len)
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#define IFQ_INC_DROPS(ifq) ((ifq)->ifq_drops++)
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#define IFQ_SET_MAXLEN(ifq, len) ((ifq)->ifq_maxlen = (len))
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/*
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* The IFF_DRV_OACTIVE test should really occur in the device driver, not in
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|
* the handoff logic, as that flag is locked by the device driver.
|
|
*/
|
|
#define IFQ_HANDOFF_ADJ(ifp, m, adj, err) \
|
|
do { \
|
|
int len; \
|
|
short mflags; \
|
|
\
|
|
len = (m)->m_pkthdr.len; \
|
|
mflags = (m)->m_flags; \
|
|
IFQ_ENQUEUE(&(ifp)->if_snd, m, err); \
|
|
if ((err) == 0) { \
|
|
(ifp)->if_obytes += len + (adj); \
|
|
if (mflags & M_MCAST) \
|
|
(ifp)->if_omcasts++; \
|
|
if (((ifp)->if_drv_flags & IFF_DRV_OACTIVE) == 0) \
|
|
if_start(ifp); \
|
|
} \
|
|
} while (0)
|
|
|
|
#define IFQ_HANDOFF(ifp, m, err) \
|
|
IFQ_HANDOFF_ADJ(ifp, m, 0, err)
|
|
|
|
#define IFQ_DRV_DEQUEUE(ifq, m) \
|
|
do { \
|
|
(m) = (ifq)->ifq_drv_head; \
|
|
if (m) { \
|
|
if (((ifq)->ifq_drv_head = (m)->m_nextpkt) == NULL) \
|
|
(ifq)->ifq_drv_tail = NULL; \
|
|
(m)->m_nextpkt = NULL; \
|
|
(ifq)->ifq_drv_len--; \
|
|
} else { \
|
|
IFQ_LOCK(ifq); \
|
|
IFQ_DEQUEUE_NOLOCK(ifq, m); \
|
|
while ((ifq)->ifq_drv_len < (ifq)->ifq_drv_maxlen) { \
|
|
struct mbuf *m0; \
|
|
IFQ_DEQUEUE_NOLOCK(ifq, m0); \
|
|
if (m0 == NULL) \
|
|
break; \
|
|
m0->m_nextpkt = NULL; \
|
|
if ((ifq)->ifq_drv_tail == NULL) \
|
|
(ifq)->ifq_drv_head = m0; \
|
|
else \
|
|
(ifq)->ifq_drv_tail->m_nextpkt = m0; \
|
|
(ifq)->ifq_drv_tail = m0; \
|
|
(ifq)->ifq_drv_len++; \
|
|
} \
|
|
IFQ_UNLOCK(ifq); \
|
|
} \
|
|
} while (0)
|
|
|
|
#define IFQ_DRV_PREPEND(ifq, m) \
|
|
do { \
|
|
(m)->m_nextpkt = (ifq)->ifq_drv_head; \
|
|
if ((ifq)->ifq_drv_tail == NULL) \
|
|
(ifq)->ifq_drv_tail = (m); \
|
|
(ifq)->ifq_drv_head = (m); \
|
|
(ifq)->ifq_drv_len++; \
|
|
} while (0)
|
|
|
|
#define IFQ_DRV_IS_EMPTY(ifq) \
|
|
(((ifq)->ifq_drv_len == 0) && ((ifq)->ifq_len == 0))
|
|
|
|
#define IFQ_DRV_PURGE(ifq) \
|
|
do { \
|
|
struct mbuf *m, *n = (ifq)->ifq_drv_head; \
|
|
while((m = n) != NULL) { \
|
|
n = m->m_nextpkt; \
|
|
m_freem(m); \
|
|
} \
|
|
(ifq)->ifq_drv_head = (ifq)->ifq_drv_tail = NULL; \
|
|
(ifq)->ifq_drv_len = 0; \
|
|
IFQ_PURGE(ifq); \
|
|
} while (0)
|
|
|
|
/*
|
|
* 72 was chosen below because it is the size of a TCP/IP
|
|
* header (40) + the minimum mss (32).
|
|
*/
|
|
#define IF_MINMTU 72
|
|
#define IF_MAXMTU 65535
|
|
|
|
#endif /* _KERNEL */
|
|
|
|
/*
|
|
* 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.
|
|
*
|
|
* NOTE: a 'struct ifaddr' is always at the beginning of a larger
|
|
* chunk of malloc'ed memory, where we store the three addresses
|
|
* (ifa_addr, ifa_dstaddr and ifa_netmask) referenced here.
|
|
*/
|
|
struct ifaddr {
|
|
struct sockaddr *ifa_addr; /* address of interface */
|
|
struct sockaddr *ifa_dstaddr; /* other end of p-to-p link */
|
|
#define ifa_broadaddr ifa_dstaddr /* broadcast address interface */
|
|
struct sockaddr *ifa_netmask; /* used to determine subnet */
|
|
struct if_data if_data; /* not all members are meaningful */
|
|
struct ifnet *ifa_ifp; /* back-pointer to interface */
|
|
TAILQ_ENTRY(ifaddr) ifa_link; /* queue macro glue */
|
|
void (*ifa_rtrequest) /* check or clean routes (+ or -)'d */
|
|
(int, struct rtentry *, struct rt_addrinfo *);
|
|
u_short ifa_flags; /* mostly rt_flags for cloning */
|
|
u_int ifa_refcnt; /* references to this structure */
|
|
int ifa_metric; /* cost of going out this interface */
|
|
int (*ifa_claim_addr) /* check if an addr goes to this if */
|
|
(struct ifaddr *, struct sockaddr *);
|
|
struct mtx ifa_mtx;
|
|
};
|
|
#define IFA_ROUTE RTF_UP /* route installed */
|
|
|
|
/* for compatibility with other BSDs */
|
|
#define ifa_list ifa_link
|
|
|
|
#define IFA_LOCK_INIT(ifa) \
|
|
mtx_init(&(ifa)->ifa_mtx, "ifaddr", NULL, MTX_DEF)
|
|
#define IFA_LOCK(ifa) mtx_lock(&(ifa)->ifa_mtx)
|
|
#define IFA_UNLOCK(ifa) mtx_unlock(&(ifa)->ifa_mtx)
|
|
#define IFA_DESTROY(ifa) mtx_destroy(&(ifa)->ifa_mtx)
|
|
|
|
/*
|
|
* The prefix structure contains information about one prefix
|
|
* of an interface. They are maintained by the different address families,
|
|
* are allocated and attached when a prefix or an address is set,
|
|
* and are linked together so all prefixes for an interface can be located.
|
|
*/
|
|
struct ifprefix {
|
|
struct sockaddr *ifpr_prefix; /* prefix of interface */
|
|
struct ifnet *ifpr_ifp; /* back-pointer to interface */
|
|
TAILQ_ENTRY(ifprefix) ifpr_list; /* queue macro glue */
|
|
u_char ifpr_plen; /* prefix length in bits */
|
|
u_char ifpr_type; /* protocol dependent prefix type */
|
|
};
|
|
|
|
/*
|
|
* Multicast address structure. This is analogous to the ifaddr
|
|
* structure except that it keeps track of multicast addresses.
|
|
* Also, the reference count here is a count of requests for this
|
|
* address, not a count of pointers to this structure.
|
|
*/
|
|
struct ifmultiaddr {
|
|
TAILQ_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */
|
|
struct sockaddr *ifma_addr; /* address this membership is for */
|
|
struct sockaddr *ifma_lladdr; /* link-layer translation, if any */
|
|
struct ifnet *ifma_ifp; /* back-pointer to interface */
|
|
u_int ifma_refcount; /* reference count */
|
|
void *ifma_protospec; /* protocol-specific state, if any */
|
|
};
|
|
|
|
#ifdef _KERNEL
|
|
#define IFAFREE(ifa) \
|
|
do { \
|
|
IFA_LOCK(ifa); \
|
|
KASSERT((ifa)->ifa_refcnt > 0, \
|
|
("ifa %p !(ifa_refcnt > 0)", ifa)); \
|
|
if (--(ifa)->ifa_refcnt == 0) { \
|
|
IFA_DESTROY(ifa); \
|
|
free(ifa, M_IFADDR); \
|
|
} else \
|
|
IFA_UNLOCK(ifa); \
|
|
} while (0)
|
|
|
|
#define IFAREF(ifa) \
|
|
do { \
|
|
IFA_LOCK(ifa); \
|
|
++(ifa)->ifa_refcnt; \
|
|
IFA_UNLOCK(ifa); \
|
|
} while (0)
|
|
|
|
extern struct mtx ifnet_lock;
|
|
#define IFNET_LOCK_INIT() \
|
|
mtx_init(&ifnet_lock, "ifnet", NULL, MTX_DEF | MTX_RECURSE)
|
|
#define IFNET_WLOCK() mtx_lock(&ifnet_lock)
|
|
#define IFNET_WUNLOCK() mtx_unlock(&ifnet_lock)
|
|
#define IFNET_RLOCK() IFNET_WLOCK()
|
|
#define IFNET_RUNLOCK() IFNET_WUNLOCK()
|
|
|
|
struct ifindex_entry {
|
|
struct ifnet *ife_ifnet;
|
|
struct ifaddr *ife_ifnet_addr;
|
|
struct cdev *ife_dev;
|
|
};
|
|
|
|
#define ifnet_byindex(idx) ifindex_table[(idx)].ife_ifnet
|
|
/*
|
|
* Given the index, ifaddr_byindex() returns the one and only
|
|
* link-level ifaddr for the interface. You are not supposed to use
|
|
* it to traverse the list of addresses associated to the interface.
|
|
*/
|
|
#define ifaddr_byindex(idx) ifindex_table[(idx)].ife_ifnet_addr
|
|
#define ifdev_byindex(idx) ifindex_table[(idx)].ife_dev
|
|
|
|
extern struct ifnethead ifnet;
|
|
extern struct ifindex_entry *ifindex_table;
|
|
extern int ifqmaxlen;
|
|
extern struct ifnet *loif; /* first loopback interface */
|
|
extern int if_index;
|
|
|
|
int if_addmulti(struct ifnet *, struct sockaddr *, struct ifmultiaddr **);
|
|
int if_allmulti(struct ifnet *, int);
|
|
struct ifnet* if_alloc(u_char);
|
|
void if_attach(struct ifnet *);
|
|
int if_delmulti(struct ifnet *, struct sockaddr *);
|
|
void if_detach(struct ifnet *);
|
|
void if_purgeaddrs(struct ifnet *);
|
|
void if_down(struct ifnet *);
|
|
void if_free(struct ifnet *);
|
|
void if_free_type(struct ifnet *, u_char);
|
|
void if_initname(struct ifnet *, const char *, int);
|
|
void if_link_state_change(struct ifnet *, int);
|
|
int if_printf(struct ifnet *, const char *, ...) __printflike(2, 3);
|
|
int if_setlladdr(struct ifnet *, const u_char *, int);
|
|
void if_up(struct ifnet *);
|
|
/*void ifinit(void);*/ /* declared in systm.h for main() */
|
|
int ifioctl(struct socket *, u_long, caddr_t, struct thread *);
|
|
int ifpromisc(struct ifnet *, int);
|
|
struct ifnet *ifunit(const char *);
|
|
|
|
struct ifaddr *ifa_ifwithaddr(struct sockaddr *);
|
|
struct ifaddr *ifa_ifwithdstaddr(struct sockaddr *);
|
|
struct ifaddr *ifa_ifwithnet(struct sockaddr *);
|
|
struct ifaddr *ifa_ifwithroute(int, struct sockaddr *, struct sockaddr *);
|
|
struct ifaddr *ifaof_ifpforaddr(struct sockaddr *, struct ifnet *);
|
|
|
|
int if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen);
|
|
|
|
typedef void *if_com_alloc_t(u_char type, struct ifnet *ifp);
|
|
typedef void if_com_free_t(void *com, u_char type);
|
|
void if_register_com_alloc(u_char type, if_com_alloc_t *a, if_com_free_t *f);
|
|
void if_deregister_com_alloc(u_char type);
|
|
|
|
#define IF_LLADDR(ifp) \
|
|
LLADDR((struct sockaddr_dl *) ifaddr_byindex((ifp)->if_index)->ifa_addr)
|
|
|
|
#ifdef DEVICE_POLLING
|
|
enum poll_cmd { POLL_ONLY, POLL_AND_CHECK_STATUS, POLL_DEREGISTER };
|
|
|
|
typedef void poll_handler_t(struct ifnet *ifp, enum poll_cmd cmd, int count);
|
|
int ether_poll_register(poll_handler_t *h, struct ifnet *ifp);
|
|
int ether_poll_deregister(struct ifnet *ifp);
|
|
#endif /* DEVICE_POLLING */
|
|
|
|
#endif /* _KERNEL */
|
|
|
|
#endif /* !_NET_IF_VAR_H_ */
|