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40a02d00a5
Sponsored by: The FreeBSD Foundation
1114 lines
25 KiB
C
1114 lines
25 KiB
C
/*-
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* Copyright (C) 1999-2000 by Maksim Yevmenkin <m_evmenkin@yahoo.com>
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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* BASED ON:
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* -------------------------------------------------------------------------
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*
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* Copyright (c) 1988, Julian Onions <jpo@cs.nott.ac.uk>
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* Nottingham University 1987.
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*/
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/*
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* $FreeBSD$
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* $Id: if_tap.c,v 0.21 2000/07/23 21:46:02 max Exp $
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*/
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#include "opt_compat.h"
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#include "opt_inet.h"
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#include <sys/param.h>
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#include <sys/conf.h>
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#include <sys/fcntl.h>
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#include <sys/filio.h>
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#include <sys/jail.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/module.h>
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#include <sys/poll.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/selinfo.h>
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#include <sys/signalvar.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <sys/ttycom.h>
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#include <sys/uio.h>
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#include <sys/queue.h>
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#include <net/bpf.h>
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#include <net/ethernet.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/if_clone.h>
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#include <net/if_dl.h>
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#include <net/if_media.h>
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#include <net/if_types.h>
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#include <net/route.h>
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#include <net/vnet.h>
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#include <netinet/in.h>
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#include <net/if_tapvar.h>
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#include <net/if_tap.h>
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#define CDEV_NAME "tap"
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#define TAPDEBUG if (tapdebug) printf
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static const char tapname[] = "tap";
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static const char vmnetname[] = "vmnet";
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#define TAPMAXUNIT 0x7fff
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#define VMNET_DEV_MASK CLONE_FLAG0
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/* module */
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static int tapmodevent(module_t, int, void *);
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/* device */
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static void tapclone(void *, struct ucred *, char *, int,
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struct cdev **);
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static void tapcreate(struct cdev *);
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/* network interface */
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static void tapifstart(struct ifnet *);
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static int tapifioctl(struct ifnet *, u_long, caddr_t);
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static void tapifinit(void *);
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static int tap_clone_create(struct if_clone *, int, caddr_t);
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static void tap_clone_destroy(struct ifnet *);
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static struct if_clone *tap_cloner;
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static int vmnet_clone_create(struct if_clone *, int, caddr_t);
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static void vmnet_clone_destroy(struct ifnet *);
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static struct if_clone *vmnet_cloner;
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/* character device */
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static d_open_t tapopen;
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static d_close_t tapclose;
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static d_read_t tapread;
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static d_write_t tapwrite;
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static d_ioctl_t tapioctl;
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static d_poll_t tappoll;
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static d_kqfilter_t tapkqfilter;
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/* kqueue(2) */
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static int tapkqread(struct knote *, long);
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static int tapkqwrite(struct knote *, long);
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static void tapkqdetach(struct knote *);
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static struct filterops tap_read_filterops = {
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.f_isfd = 1,
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.f_attach = NULL,
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.f_detach = tapkqdetach,
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.f_event = tapkqread,
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};
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static struct filterops tap_write_filterops = {
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.f_isfd = 1,
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.f_attach = NULL,
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.f_detach = tapkqdetach,
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.f_event = tapkqwrite,
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};
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static struct cdevsw tap_cdevsw = {
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.d_version = D_VERSION,
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.d_flags = D_NEEDMINOR,
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.d_open = tapopen,
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.d_close = tapclose,
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.d_read = tapread,
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.d_write = tapwrite,
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.d_ioctl = tapioctl,
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.d_poll = tappoll,
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.d_name = CDEV_NAME,
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.d_kqfilter = tapkqfilter,
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};
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/*
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* All global variables in if_tap.c are locked with tapmtx, with the
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* exception of tapdebug, which is accessed unlocked; tapclones is
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* static at runtime.
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*/
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static struct mtx tapmtx;
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static int tapdebug = 0; /* debug flag */
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static int tapuopen = 0; /* allow user open() */
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static int tapuponopen = 0; /* IFF_UP on open() */
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static int tapdclone = 1; /* enable devfs cloning */
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static SLIST_HEAD(, tap_softc) taphead; /* first device */
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static struct clonedevs *tapclones;
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MALLOC_DECLARE(M_TAP);
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MALLOC_DEFINE(M_TAP, CDEV_NAME, "Ethernet tunnel interface");
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SYSCTL_INT(_debug, OID_AUTO, if_tap_debug, CTLFLAG_RW, &tapdebug, 0, "");
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SYSCTL_DECL(_net_link);
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static SYSCTL_NODE(_net_link, OID_AUTO, tap, CTLFLAG_RW, 0,
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"Ethernet tunnel software network interface");
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SYSCTL_INT(_net_link_tap, OID_AUTO, user_open, CTLFLAG_RW, &tapuopen, 0,
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"Allow user to open /dev/tap (based on node permissions)");
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SYSCTL_INT(_net_link_tap, OID_AUTO, up_on_open, CTLFLAG_RW, &tapuponopen, 0,
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"Bring interface up when /dev/tap is opened");
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SYSCTL_INT(_net_link_tap, OID_AUTO, devfs_cloning, CTLFLAG_RWTUN, &tapdclone, 0,
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"Enable legacy devfs interface creation");
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SYSCTL_INT(_net_link_tap, OID_AUTO, debug, CTLFLAG_RW, &tapdebug, 0, "");
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DEV_MODULE(if_tap, tapmodevent, NULL);
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static int
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tap_clone_create(struct if_clone *ifc, int unit, caddr_t params)
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{
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struct cdev *dev;
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int i;
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/* Find any existing device, or allocate new unit number. */
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i = clone_create(&tapclones, &tap_cdevsw, &unit, &dev, 0);
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if (i) {
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dev = make_dev(&tap_cdevsw, unit, UID_ROOT, GID_WHEEL, 0600,
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"%s%d", tapname, unit);
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}
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tapcreate(dev);
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return (0);
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}
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/* vmnet devices are tap devices in disguise */
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static int
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vmnet_clone_create(struct if_clone *ifc, int unit, caddr_t params)
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{
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struct cdev *dev;
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int i;
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/* Find any existing device, or allocate new unit number. */
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i = clone_create(&tapclones, &tap_cdevsw, &unit, &dev, VMNET_DEV_MASK);
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if (i) {
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dev = make_dev(&tap_cdevsw, unit | VMNET_DEV_MASK, UID_ROOT,
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GID_WHEEL, 0600, "%s%d", vmnetname, unit);
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}
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tapcreate(dev);
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return (0);
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}
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static void
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tap_destroy(struct tap_softc *tp)
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{
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struct ifnet *ifp = tp->tap_ifp;
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CURVNET_SET(ifp->if_vnet);
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destroy_dev(tp->tap_dev);
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seldrain(&tp->tap_rsel);
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knlist_clear(&tp->tap_rsel.si_note, 0);
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knlist_destroy(&tp->tap_rsel.si_note);
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ether_ifdetach(ifp);
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if_free(ifp);
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mtx_destroy(&tp->tap_mtx);
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free(tp, M_TAP);
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CURVNET_RESTORE();
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}
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static void
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tap_clone_destroy(struct ifnet *ifp)
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{
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struct tap_softc *tp = ifp->if_softc;
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mtx_lock(&tapmtx);
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SLIST_REMOVE(&taphead, tp, tap_softc, tap_next);
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mtx_unlock(&tapmtx);
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tap_destroy(tp);
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}
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/* vmnet devices are tap devices in disguise */
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static void
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vmnet_clone_destroy(struct ifnet *ifp)
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{
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tap_clone_destroy(ifp);
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}
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/*
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* tapmodevent
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*
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* module event handler
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*/
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static int
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tapmodevent(module_t mod, int type, void *data)
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{
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static eventhandler_tag eh_tag = NULL;
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struct tap_softc *tp = NULL;
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struct ifnet *ifp = NULL;
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switch (type) {
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case MOD_LOAD:
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/* intitialize device */
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mtx_init(&tapmtx, "tapmtx", NULL, MTX_DEF);
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SLIST_INIT(&taphead);
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clone_setup(&tapclones);
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eh_tag = EVENTHANDLER_REGISTER(dev_clone, tapclone, 0, 1000);
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if (eh_tag == NULL) {
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clone_cleanup(&tapclones);
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mtx_destroy(&tapmtx);
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return (ENOMEM);
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}
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tap_cloner = if_clone_simple(tapname, tap_clone_create,
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tap_clone_destroy, 0);
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vmnet_cloner = if_clone_simple(vmnetname, vmnet_clone_create,
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vmnet_clone_destroy, 0);
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return (0);
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case MOD_UNLOAD:
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/*
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* The EBUSY algorithm here can't quite atomically
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* guarantee that this is race-free since we have to
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* release the tap mtx to deregister the clone handler.
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*/
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mtx_lock(&tapmtx);
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SLIST_FOREACH(tp, &taphead, tap_next) {
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mtx_lock(&tp->tap_mtx);
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if (tp->tap_flags & TAP_OPEN) {
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mtx_unlock(&tp->tap_mtx);
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mtx_unlock(&tapmtx);
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return (EBUSY);
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}
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mtx_unlock(&tp->tap_mtx);
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}
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mtx_unlock(&tapmtx);
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EVENTHANDLER_DEREGISTER(dev_clone, eh_tag);
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if_clone_detach(tap_cloner);
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if_clone_detach(vmnet_cloner);
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drain_dev_clone_events();
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mtx_lock(&tapmtx);
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while ((tp = SLIST_FIRST(&taphead)) != NULL) {
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SLIST_REMOVE_HEAD(&taphead, tap_next);
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mtx_unlock(&tapmtx);
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ifp = tp->tap_ifp;
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TAPDEBUG("detaching %s\n", ifp->if_xname);
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tap_destroy(tp);
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mtx_lock(&tapmtx);
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}
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mtx_unlock(&tapmtx);
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clone_cleanup(&tapclones);
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mtx_destroy(&tapmtx);
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break;
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default:
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return (EOPNOTSUPP);
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}
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return (0);
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} /* tapmodevent */
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/*
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* DEVFS handler
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*
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* We need to support two kind of devices - tap and vmnet
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*/
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static void
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tapclone(void *arg, struct ucred *cred, char *name, int namelen, struct cdev **dev)
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{
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char devname[SPECNAMELEN + 1];
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int i, unit, append_unit;
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int extra;
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if (*dev != NULL)
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return;
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if (!tapdclone ||
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(!tapuopen && priv_check_cred(cred, PRIV_NET_IFCREATE, 0) != 0))
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return;
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unit = 0;
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append_unit = 0;
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extra = 0;
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/* We're interested in only tap/vmnet devices. */
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if (strcmp(name, tapname) == 0) {
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unit = -1;
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} else if (strcmp(name, vmnetname) == 0) {
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unit = -1;
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extra = VMNET_DEV_MASK;
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} else if (dev_stdclone(name, NULL, tapname, &unit) != 1) {
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if (dev_stdclone(name, NULL, vmnetname, &unit) != 1) {
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return;
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} else {
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extra = VMNET_DEV_MASK;
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}
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}
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if (unit == -1)
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append_unit = 1;
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CURVNET_SET(CRED_TO_VNET(cred));
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/* find any existing device, or allocate new unit number */
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i = clone_create(&tapclones, &tap_cdevsw, &unit, dev, extra);
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if (i) {
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if (append_unit) {
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/*
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* We were passed 'tun' or 'tap', with no unit specified
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* so we'll need to append it now.
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*/
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namelen = snprintf(devname, sizeof(devname), "%s%d", name,
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unit);
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name = devname;
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}
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*dev = make_dev_credf(MAKEDEV_REF, &tap_cdevsw, unit | extra,
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cred, UID_ROOT, GID_WHEEL, 0600, "%s", name);
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}
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if_clone_create(name, namelen, NULL);
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CURVNET_RESTORE();
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} /* tapclone */
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/*
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* tapcreate
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*
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* to create interface
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*/
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static void
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tapcreate(struct cdev *dev)
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{
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struct ifnet *ifp = NULL;
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struct tap_softc *tp = NULL;
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unsigned short macaddr_hi;
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uint32_t macaddr_mid;
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int unit;
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const char *name = NULL;
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u_char eaddr[6];
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/* allocate driver storage and create device */
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tp = malloc(sizeof(*tp), M_TAP, M_WAITOK | M_ZERO);
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mtx_init(&tp->tap_mtx, "tap_mtx", NULL, MTX_DEF);
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mtx_lock(&tapmtx);
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SLIST_INSERT_HEAD(&taphead, tp, tap_next);
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mtx_unlock(&tapmtx);
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unit = dev2unit(dev);
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/* select device: tap or vmnet */
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if (unit & VMNET_DEV_MASK) {
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name = vmnetname;
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tp->tap_flags |= TAP_VMNET;
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} else
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name = tapname;
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unit &= TAPMAXUNIT;
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TAPDEBUG("tapcreate(%s%d). minor = %#x\n", name, unit, dev2unit(dev));
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/* generate fake MAC address: 00 bd xx xx xx unit_no */
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macaddr_hi = htons(0x00bd);
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macaddr_mid = (uint32_t) ticks;
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bcopy(&macaddr_hi, eaddr, sizeof(short));
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bcopy(&macaddr_mid, &eaddr[2], sizeof(uint32_t));
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eaddr[5] = (u_char)unit;
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/* fill the rest and attach interface */
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ifp = tp->tap_ifp = if_alloc(IFT_ETHER);
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if (ifp == NULL)
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panic("%s%d: can not if_alloc()", name, unit);
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ifp->if_softc = tp;
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if_initname(ifp, name, unit);
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ifp->if_init = tapifinit;
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ifp->if_start = tapifstart;
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ifp->if_ioctl = tapifioctl;
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ifp->if_mtu = ETHERMTU;
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ifp->if_flags = (IFF_BROADCAST|IFF_SIMPLEX|IFF_MULTICAST);
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IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
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ifp->if_capabilities |= IFCAP_LINKSTATE;
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ifp->if_capenable |= IFCAP_LINKSTATE;
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dev->si_drv1 = tp;
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tp->tap_dev = dev;
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ether_ifattach(ifp, eaddr);
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mtx_lock(&tp->tap_mtx);
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tp->tap_flags |= TAP_INITED;
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mtx_unlock(&tp->tap_mtx);
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knlist_init_mtx(&tp->tap_rsel.si_note, &tp->tap_mtx);
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TAPDEBUG("interface %s is created. minor = %#x\n",
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ifp->if_xname, dev2unit(dev));
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} /* tapcreate */
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/*
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* tapopen
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*
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* to open tunnel. must be superuser
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*/
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static int
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tapopen(struct cdev *dev, int flag, int mode, struct thread *td)
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{
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struct tap_softc *tp = NULL;
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struct ifnet *ifp = NULL;
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int error;
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if (tapuopen == 0) {
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error = priv_check(td, PRIV_NET_TAP);
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if (error)
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return (error);
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}
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if ((dev2unit(dev) & CLONE_UNITMASK) > TAPMAXUNIT)
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return (ENXIO);
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tp = dev->si_drv1;
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mtx_lock(&tp->tap_mtx);
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if (tp->tap_flags & TAP_OPEN) {
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mtx_unlock(&tp->tap_mtx);
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return (EBUSY);
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}
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bcopy(IF_LLADDR(tp->tap_ifp), tp->ether_addr, sizeof(tp->ether_addr));
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tp->tap_pid = td->td_proc->p_pid;
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tp->tap_flags |= TAP_OPEN;
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ifp = tp->tap_ifp;
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ifp->if_drv_flags |= IFF_DRV_RUNNING;
|
|
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
|
|
if (tapuponopen)
|
|
ifp->if_flags |= IFF_UP;
|
|
if_link_state_change(ifp, LINK_STATE_UP);
|
|
mtx_unlock(&tp->tap_mtx);
|
|
|
|
TAPDEBUG("%s is open. minor = %#x\n", ifp->if_xname, dev2unit(dev));
|
|
|
|
return (0);
|
|
} /* tapopen */
|
|
|
|
|
|
/*
|
|
* tapclose
|
|
*
|
|
* close the device - mark i/f down & delete routing info
|
|
*/
|
|
static int
|
|
tapclose(struct cdev *dev, int foo, int bar, struct thread *td)
|
|
{
|
|
struct ifaddr *ifa;
|
|
struct tap_softc *tp = dev->si_drv1;
|
|
struct ifnet *ifp = tp->tap_ifp;
|
|
|
|
/* junk all pending output */
|
|
mtx_lock(&tp->tap_mtx);
|
|
CURVNET_SET(ifp->if_vnet);
|
|
IF_DRAIN(&ifp->if_snd);
|
|
|
|
/*
|
|
* Do not bring the interface down, and do not anything with
|
|
* interface, if we are in VMnet mode. Just close the device.
|
|
*/
|
|
if (((tp->tap_flags & TAP_VMNET) == 0) &&
|
|
(ifp->if_flags & (IFF_UP | IFF_LINK0)) == IFF_UP) {
|
|
mtx_unlock(&tp->tap_mtx);
|
|
if_down(ifp);
|
|
mtx_lock(&tp->tap_mtx);
|
|
if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
|
|
ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
|
|
mtx_unlock(&tp->tap_mtx);
|
|
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
|
|
rtinit(ifa, (int)RTM_DELETE, 0);
|
|
}
|
|
if_purgeaddrs(ifp);
|
|
mtx_lock(&tp->tap_mtx);
|
|
}
|
|
}
|
|
|
|
if_link_state_change(ifp, LINK_STATE_DOWN);
|
|
CURVNET_RESTORE();
|
|
|
|
funsetown(&tp->tap_sigio);
|
|
selwakeuppri(&tp->tap_rsel, PZERO+1);
|
|
KNOTE_LOCKED(&tp->tap_rsel.si_note, 0);
|
|
|
|
tp->tap_flags &= ~TAP_OPEN;
|
|
tp->tap_pid = 0;
|
|
mtx_unlock(&tp->tap_mtx);
|
|
|
|
TAPDEBUG("%s is closed. minor = %#x\n",
|
|
ifp->if_xname, dev2unit(dev));
|
|
|
|
return (0);
|
|
} /* tapclose */
|
|
|
|
|
|
/*
|
|
* tapifinit
|
|
*
|
|
* network interface initialization function
|
|
*/
|
|
static void
|
|
tapifinit(void *xtp)
|
|
{
|
|
struct tap_softc *tp = (struct tap_softc *)xtp;
|
|
struct ifnet *ifp = tp->tap_ifp;
|
|
|
|
TAPDEBUG("initializing %s\n", ifp->if_xname);
|
|
|
|
mtx_lock(&tp->tap_mtx);
|
|
ifp->if_drv_flags |= IFF_DRV_RUNNING;
|
|
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
|
|
mtx_unlock(&tp->tap_mtx);
|
|
|
|
/* attempt to start output */
|
|
tapifstart(ifp);
|
|
} /* tapifinit */
|
|
|
|
|
|
/*
|
|
* tapifioctl
|
|
*
|
|
* Process an ioctl request on network interface
|
|
*/
|
|
static int
|
|
tapifioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
|
|
{
|
|
struct tap_softc *tp = ifp->if_softc;
|
|
struct ifreq *ifr = (struct ifreq *)data;
|
|
struct ifstat *ifs = NULL;
|
|
struct ifmediareq *ifmr = NULL;
|
|
int dummy, error = 0;
|
|
|
|
switch (cmd) {
|
|
case SIOCSIFFLAGS: /* XXX -- just like vmnet does */
|
|
case SIOCADDMULTI:
|
|
case SIOCDELMULTI:
|
|
break;
|
|
|
|
case SIOCGIFMEDIA:
|
|
ifmr = (struct ifmediareq *)data;
|
|
dummy = ifmr->ifm_count;
|
|
ifmr->ifm_count = 1;
|
|
ifmr->ifm_status = IFM_AVALID;
|
|
ifmr->ifm_active = IFM_ETHER;
|
|
if (tp->tap_flags & TAP_OPEN)
|
|
ifmr->ifm_status |= IFM_ACTIVE;
|
|
ifmr->ifm_current = ifmr->ifm_active;
|
|
if (dummy >= 1) {
|
|
int media = IFM_ETHER;
|
|
error = copyout(&media, ifmr->ifm_ulist,
|
|
sizeof(int));
|
|
}
|
|
break;
|
|
|
|
case SIOCSIFMTU:
|
|
ifp->if_mtu = ifr->ifr_mtu;
|
|
break;
|
|
|
|
case SIOCGIFSTATUS:
|
|
ifs = (struct ifstat *)data;
|
|
mtx_lock(&tp->tap_mtx);
|
|
if (tp->tap_pid != 0)
|
|
snprintf(ifs->ascii, sizeof(ifs->ascii),
|
|
"\tOpened by PID %d\n", tp->tap_pid);
|
|
else
|
|
ifs->ascii[0] = '\0';
|
|
mtx_unlock(&tp->tap_mtx);
|
|
break;
|
|
|
|
default:
|
|
error = ether_ioctl(ifp, cmd, data);
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
} /* tapifioctl */
|
|
|
|
|
|
/*
|
|
* tapifstart
|
|
*
|
|
* queue packets from higher level ready to put out
|
|
*/
|
|
static void
|
|
tapifstart(struct ifnet *ifp)
|
|
{
|
|
struct tap_softc *tp = ifp->if_softc;
|
|
|
|
TAPDEBUG("%s starting\n", ifp->if_xname);
|
|
|
|
/*
|
|
* do not junk pending output if we are in VMnet mode.
|
|
* XXX: can this do any harm because of queue overflow?
|
|
*/
|
|
|
|
mtx_lock(&tp->tap_mtx);
|
|
if (((tp->tap_flags & TAP_VMNET) == 0) &&
|
|
((tp->tap_flags & TAP_READY) != TAP_READY)) {
|
|
struct mbuf *m;
|
|
|
|
/* Unlocked read. */
|
|
TAPDEBUG("%s not ready, tap_flags = 0x%x\n", ifp->if_xname,
|
|
tp->tap_flags);
|
|
|
|
for (;;) {
|
|
IF_DEQUEUE(&ifp->if_snd, m);
|
|
if (m != NULL) {
|
|
m_freem(m);
|
|
if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
|
|
} else
|
|
break;
|
|
}
|
|
mtx_unlock(&tp->tap_mtx);
|
|
|
|
return;
|
|
}
|
|
|
|
ifp->if_drv_flags |= IFF_DRV_OACTIVE;
|
|
|
|
if (!IFQ_IS_EMPTY(&ifp->if_snd)) {
|
|
if (tp->tap_flags & TAP_RWAIT) {
|
|
tp->tap_flags &= ~TAP_RWAIT;
|
|
wakeup(tp);
|
|
}
|
|
|
|
if ((tp->tap_flags & TAP_ASYNC) && (tp->tap_sigio != NULL)) {
|
|
mtx_unlock(&tp->tap_mtx);
|
|
pgsigio(&tp->tap_sigio, SIGIO, 0);
|
|
mtx_lock(&tp->tap_mtx);
|
|
}
|
|
|
|
selwakeuppri(&tp->tap_rsel, PZERO+1);
|
|
KNOTE_LOCKED(&tp->tap_rsel.si_note, 0);
|
|
if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); /* obytes are counted in ether_output */
|
|
}
|
|
|
|
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
|
|
mtx_unlock(&tp->tap_mtx);
|
|
} /* tapifstart */
|
|
|
|
|
|
/*
|
|
* tapioctl
|
|
*
|
|
* the cdevsw interface is now pretty minimal
|
|
*/
|
|
static int
|
|
tapioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
|
|
{
|
|
struct tap_softc *tp = dev->si_drv1;
|
|
struct ifnet *ifp = tp->tap_ifp;
|
|
struct tapinfo *tapp = NULL;
|
|
int f;
|
|
#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
|
|
defined(COMPAT_FREEBSD4)
|
|
int ival;
|
|
#endif
|
|
|
|
switch (cmd) {
|
|
case TAPSIFINFO:
|
|
tapp = (struct tapinfo *)data;
|
|
mtx_lock(&tp->tap_mtx);
|
|
ifp->if_mtu = tapp->mtu;
|
|
ifp->if_type = tapp->type;
|
|
ifp->if_baudrate = tapp->baudrate;
|
|
mtx_unlock(&tp->tap_mtx);
|
|
break;
|
|
|
|
case TAPGIFINFO:
|
|
tapp = (struct tapinfo *)data;
|
|
mtx_lock(&tp->tap_mtx);
|
|
tapp->mtu = ifp->if_mtu;
|
|
tapp->type = ifp->if_type;
|
|
tapp->baudrate = ifp->if_baudrate;
|
|
mtx_unlock(&tp->tap_mtx);
|
|
break;
|
|
|
|
case TAPSDEBUG:
|
|
tapdebug = *(int *)data;
|
|
break;
|
|
|
|
case TAPGDEBUG:
|
|
*(int *)data = tapdebug;
|
|
break;
|
|
|
|
case TAPGIFNAME: {
|
|
struct ifreq *ifr = (struct ifreq *) data;
|
|
|
|
strlcpy(ifr->ifr_name, ifp->if_xname, IFNAMSIZ);
|
|
} break;
|
|
|
|
case FIONBIO:
|
|
break;
|
|
|
|
case FIOASYNC:
|
|
mtx_lock(&tp->tap_mtx);
|
|
if (*(int *)data)
|
|
tp->tap_flags |= TAP_ASYNC;
|
|
else
|
|
tp->tap_flags &= ~TAP_ASYNC;
|
|
mtx_unlock(&tp->tap_mtx);
|
|
break;
|
|
|
|
case FIONREAD:
|
|
if (!IFQ_IS_EMPTY(&ifp->if_snd)) {
|
|
struct mbuf *mb;
|
|
|
|
IFQ_LOCK(&ifp->if_snd);
|
|
IFQ_POLL_NOLOCK(&ifp->if_snd, mb);
|
|
for (*(int *)data = 0; mb != NULL;
|
|
mb = mb->m_next)
|
|
*(int *)data += mb->m_len;
|
|
IFQ_UNLOCK(&ifp->if_snd);
|
|
} else
|
|
*(int *)data = 0;
|
|
break;
|
|
|
|
case FIOSETOWN:
|
|
return (fsetown(*(int *)data, &tp->tap_sigio));
|
|
|
|
case FIOGETOWN:
|
|
*(int *)data = fgetown(&tp->tap_sigio);
|
|
return (0);
|
|
|
|
/* this is deprecated, FIOSETOWN should be used instead */
|
|
case TIOCSPGRP:
|
|
return (fsetown(-(*(int *)data), &tp->tap_sigio));
|
|
|
|
/* this is deprecated, FIOGETOWN should be used instead */
|
|
case TIOCGPGRP:
|
|
*(int *)data = -fgetown(&tp->tap_sigio);
|
|
return (0);
|
|
|
|
/* VMware/VMnet port ioctl's */
|
|
|
|
#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
|
|
defined(COMPAT_FREEBSD4)
|
|
case _IO('V', 0):
|
|
ival = IOCPARM_IVAL(data);
|
|
data = (caddr_t)&ival;
|
|
/* FALLTHROUGH */
|
|
#endif
|
|
case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */
|
|
f = *(int *)data;
|
|
f &= 0x0fff;
|
|
f &= ~IFF_CANTCHANGE;
|
|
f |= IFF_UP;
|
|
|
|
mtx_lock(&tp->tap_mtx);
|
|
ifp->if_flags = f | (ifp->if_flags & IFF_CANTCHANGE);
|
|
mtx_unlock(&tp->tap_mtx);
|
|
break;
|
|
|
|
case SIOCGIFADDR: /* get MAC address of the remote side */
|
|
mtx_lock(&tp->tap_mtx);
|
|
bcopy(tp->ether_addr, data, sizeof(tp->ether_addr));
|
|
mtx_unlock(&tp->tap_mtx);
|
|
break;
|
|
|
|
case SIOCSIFADDR: /* set MAC address of the remote side */
|
|
mtx_lock(&tp->tap_mtx);
|
|
bcopy(data, tp->ether_addr, sizeof(tp->ether_addr));
|
|
mtx_unlock(&tp->tap_mtx);
|
|
break;
|
|
|
|
default:
|
|
return (ENOTTY);
|
|
}
|
|
return (0);
|
|
} /* tapioctl */
|
|
|
|
|
|
/*
|
|
* tapread
|
|
*
|
|
* the cdevsw read interface - reads a packet at a time, or at
|
|
* least as much of a packet as can be read
|
|
*/
|
|
static int
|
|
tapread(struct cdev *dev, struct uio *uio, int flag)
|
|
{
|
|
struct tap_softc *tp = dev->si_drv1;
|
|
struct ifnet *ifp = tp->tap_ifp;
|
|
struct mbuf *m = NULL;
|
|
int error = 0, len;
|
|
|
|
TAPDEBUG("%s reading, minor = %#x\n", ifp->if_xname, dev2unit(dev));
|
|
|
|
mtx_lock(&tp->tap_mtx);
|
|
if ((tp->tap_flags & TAP_READY) != TAP_READY) {
|
|
mtx_unlock(&tp->tap_mtx);
|
|
|
|
/* Unlocked read. */
|
|
TAPDEBUG("%s not ready. minor = %#x, tap_flags = 0x%x\n",
|
|
ifp->if_xname, dev2unit(dev), tp->tap_flags);
|
|
|
|
return (EHOSTDOWN);
|
|
}
|
|
|
|
tp->tap_flags &= ~TAP_RWAIT;
|
|
|
|
/* sleep until we get a packet */
|
|
do {
|
|
IF_DEQUEUE(&ifp->if_snd, m);
|
|
|
|
if (m == NULL) {
|
|
if (flag & O_NONBLOCK) {
|
|
mtx_unlock(&tp->tap_mtx);
|
|
return (EWOULDBLOCK);
|
|
}
|
|
|
|
tp->tap_flags |= TAP_RWAIT;
|
|
error = mtx_sleep(tp, &tp->tap_mtx, PCATCH | (PZERO + 1),
|
|
"taprd", 0);
|
|
if (error) {
|
|
mtx_unlock(&tp->tap_mtx);
|
|
return (error);
|
|
}
|
|
}
|
|
} while (m == NULL);
|
|
mtx_unlock(&tp->tap_mtx);
|
|
|
|
/* feed packet to bpf */
|
|
BPF_MTAP(ifp, m);
|
|
|
|
/* xfer packet to user space */
|
|
while ((m != NULL) && (uio->uio_resid > 0) && (error == 0)) {
|
|
len = min(uio->uio_resid, m->m_len);
|
|
if (len == 0)
|
|
break;
|
|
|
|
error = uiomove(mtod(m, void *), len, uio);
|
|
m = m_free(m);
|
|
}
|
|
|
|
if (m != NULL) {
|
|
TAPDEBUG("%s dropping mbuf, minor = %#x\n", ifp->if_xname,
|
|
dev2unit(dev));
|
|
m_freem(m);
|
|
}
|
|
|
|
return (error);
|
|
} /* tapread */
|
|
|
|
|
|
/*
|
|
* tapwrite
|
|
*
|
|
* the cdevsw write interface - an atomic write is a packet - or else!
|
|
*/
|
|
static int
|
|
tapwrite(struct cdev *dev, struct uio *uio, int flag)
|
|
{
|
|
struct ether_header *eh;
|
|
struct tap_softc *tp = dev->si_drv1;
|
|
struct ifnet *ifp = tp->tap_ifp;
|
|
struct mbuf *m;
|
|
|
|
TAPDEBUG("%s writing, minor = %#x\n",
|
|
ifp->if_xname, dev2unit(dev));
|
|
|
|
if (uio->uio_resid == 0)
|
|
return (0);
|
|
|
|
if ((uio->uio_resid < 0) || (uio->uio_resid > TAPMRU)) {
|
|
TAPDEBUG("%s invalid packet len = %zd, minor = %#x\n",
|
|
ifp->if_xname, uio->uio_resid, dev2unit(dev));
|
|
|
|
return (EIO);
|
|
}
|
|
|
|
if ((m = m_uiotombuf(uio, M_NOWAIT, 0, ETHER_ALIGN,
|
|
M_PKTHDR)) == NULL) {
|
|
if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
|
|
return (ENOBUFS);
|
|
}
|
|
|
|
m->m_pkthdr.rcvif = ifp;
|
|
|
|
/*
|
|
* Only pass a unicast frame to ether_input(), if it would actually
|
|
* have been received by non-virtual hardware.
|
|
*/
|
|
if (m->m_len < sizeof(struct ether_header)) {
|
|
m_freem(m);
|
|
return (0);
|
|
}
|
|
eh = mtod(m, struct ether_header *);
|
|
|
|
if (eh && (ifp->if_flags & IFF_PROMISC) == 0 &&
|
|
!ETHER_IS_MULTICAST(eh->ether_dhost) &&
|
|
bcmp(eh->ether_dhost, IF_LLADDR(ifp), ETHER_ADDR_LEN) != 0) {
|
|
m_freem(m);
|
|
return (0);
|
|
}
|
|
|
|
/* Pass packet up to parent. */
|
|
CURVNET_SET(ifp->if_vnet);
|
|
(*ifp->if_input)(ifp, m);
|
|
CURVNET_RESTORE();
|
|
if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); /* ibytes are counted in parent */
|
|
|
|
return (0);
|
|
} /* tapwrite */
|
|
|
|
|
|
/*
|
|
* tappoll
|
|
*
|
|
* the poll interface, this is only useful on reads
|
|
* really. the write detect always returns true, write never blocks
|
|
* anyway, it either accepts the packet or drops it
|
|
*/
|
|
static int
|
|
tappoll(struct cdev *dev, int events, struct thread *td)
|
|
{
|
|
struct tap_softc *tp = dev->si_drv1;
|
|
struct ifnet *ifp = tp->tap_ifp;
|
|
int revents = 0;
|
|
|
|
TAPDEBUG("%s polling, minor = %#x\n",
|
|
ifp->if_xname, dev2unit(dev));
|
|
|
|
if (events & (POLLIN | POLLRDNORM)) {
|
|
IFQ_LOCK(&ifp->if_snd);
|
|
if (!IFQ_IS_EMPTY(&ifp->if_snd)) {
|
|
TAPDEBUG("%s have data in queue. len = %d, " \
|
|
"minor = %#x\n", ifp->if_xname,
|
|
ifp->if_snd.ifq_len, dev2unit(dev));
|
|
|
|
revents |= (events & (POLLIN | POLLRDNORM));
|
|
} else {
|
|
TAPDEBUG("%s waiting for data, minor = %#x\n",
|
|
ifp->if_xname, dev2unit(dev));
|
|
|
|
selrecord(td, &tp->tap_rsel);
|
|
}
|
|
IFQ_UNLOCK(&ifp->if_snd);
|
|
}
|
|
|
|
if (events & (POLLOUT | POLLWRNORM))
|
|
revents |= (events & (POLLOUT | POLLWRNORM));
|
|
|
|
return (revents);
|
|
} /* tappoll */
|
|
|
|
|
|
/*
|
|
* tap_kqfilter
|
|
*
|
|
* support for kevent() system call
|
|
*/
|
|
static int
|
|
tapkqfilter(struct cdev *dev, struct knote *kn)
|
|
{
|
|
struct tap_softc *tp = dev->si_drv1;
|
|
struct ifnet *ifp = tp->tap_ifp;
|
|
|
|
switch (kn->kn_filter) {
|
|
case EVFILT_READ:
|
|
TAPDEBUG("%s kqfilter: EVFILT_READ, minor = %#x\n",
|
|
ifp->if_xname, dev2unit(dev));
|
|
kn->kn_fop = &tap_read_filterops;
|
|
break;
|
|
|
|
case EVFILT_WRITE:
|
|
TAPDEBUG("%s kqfilter: EVFILT_WRITE, minor = %#x\n",
|
|
ifp->if_xname, dev2unit(dev));
|
|
kn->kn_fop = &tap_write_filterops;
|
|
break;
|
|
|
|
default:
|
|
TAPDEBUG("%s kqfilter: invalid filter, minor = %#x\n",
|
|
ifp->if_xname, dev2unit(dev));
|
|
return (EINVAL);
|
|
/* NOT REACHED */
|
|
}
|
|
|
|
kn->kn_hook = tp;
|
|
knlist_add(&tp->tap_rsel.si_note, kn, 0);
|
|
|
|
return (0);
|
|
} /* tapkqfilter */
|
|
|
|
|
|
/*
|
|
* tap_kqread
|
|
*
|
|
* Return true if there is data in the interface queue
|
|
*/
|
|
static int
|
|
tapkqread(struct knote *kn, long hint)
|
|
{
|
|
int ret;
|
|
struct tap_softc *tp = kn->kn_hook;
|
|
struct cdev *dev = tp->tap_dev;
|
|
struct ifnet *ifp = tp->tap_ifp;
|
|
|
|
if ((kn->kn_data = ifp->if_snd.ifq_len) > 0) {
|
|
TAPDEBUG("%s have data in queue. len = %d, minor = %#x\n",
|
|
ifp->if_xname, ifp->if_snd.ifq_len, dev2unit(dev));
|
|
ret = 1;
|
|
} else {
|
|
TAPDEBUG("%s waiting for data, minor = %#x\n",
|
|
ifp->if_xname, dev2unit(dev));
|
|
ret = 0;
|
|
}
|
|
|
|
return (ret);
|
|
} /* tapkqread */
|
|
|
|
|
|
/*
|
|
* tap_kqwrite
|
|
*
|
|
* Always can write. Return the MTU in kn->data
|
|
*/
|
|
static int
|
|
tapkqwrite(struct knote *kn, long hint)
|
|
{
|
|
struct tap_softc *tp = kn->kn_hook;
|
|
struct ifnet *ifp = tp->tap_ifp;
|
|
|
|
kn->kn_data = ifp->if_mtu;
|
|
|
|
return (1);
|
|
} /* tapkqwrite */
|
|
|
|
|
|
static void
|
|
tapkqdetach(struct knote *kn)
|
|
{
|
|
struct tap_softc *tp = kn->kn_hook;
|
|
|
|
knlist_remove(&tp->tap_rsel.si_note, kn, 0);
|
|
} /* tapkqdetach */
|
|
|