45778b37b2
so if_tap doesn't need to rely on locally-rolled code to do same. The observable symptom of if_tap's bzero'ing the address details was a crash in "ifconfig tap0" after an if_tap device was closed. Reported By: Matti Saarinen (mjsaarin at cc dot helsinki dot fi)
874 lines
19 KiB
C
874 lines
19 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_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/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/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_arp.h>
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#include <net/route.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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#define TAP "tap"
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#define VMNET "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 *, char *, int, 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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/* 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 struct cdevsw tap_cdevsw = {
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.d_version = D_VERSION,
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.d_flags = D_PSEUDO | D_NEEDGIANT,
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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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};
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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 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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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, debug, CTLFLAG_RW, &tapdebug, 0, "");
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DEV_MODULE(if_tap, tapmodevent, NULL);
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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(mod, type, data)
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module_t mod;
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int type;
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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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int s;
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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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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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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_if;
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TAPDEBUG("detaching %s\n", ifp->if_xname);
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/* Unlocked read. */
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KASSERT(!(tp->tap_flags & TAP_OPEN),
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("%s flags is out of sync", ifp->if_xname));
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destroy_dev(tp->tap_dev);
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s = splimp();
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ether_ifdetach(ifp);
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splx(s);
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mtx_destroy(&tp->tap_mtx);
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free(tp, M_TAP);
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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(arg, name, namelen, dev)
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void *arg;
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char *name;
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int namelen;
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struct cdev **dev;
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{
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u_int extra;
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int i, unit;
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char *device_name = name;
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if (*dev != NULL)
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return;
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device_name = TAP;
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extra = 0;
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if (strcmp(name, TAP) == 0) {
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unit = -1;
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} else if (strcmp(name, VMNET) == 0) {
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device_name = VMNET;
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extra = VMNET_DEV_MASK;
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unit = -1;
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} else if (dev_stdclone(name, NULL, device_name, &unit) != 1) {
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device_name = VMNET;
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extra = VMNET_DEV_MASK;
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if (dev_stdclone(name, NULL, device_name, &unit) != 1)
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return;
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}
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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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*dev = make_dev(&tap_cdevsw, unit2minor(unit | extra),
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UID_ROOT, GID_WHEEL, 0600, "%s%d", device_name, unit);
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if (*dev != NULL) {
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dev_ref(*dev);
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(*dev)->si_flags |= SI_CHEAPCLONE;
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}
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}
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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(dev)
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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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int unit, s;
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char *name = NULL;
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dev->si_flags &= ~SI_CHEAPCLONE;
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/* allocate driver storage and create device */
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MALLOC(tp, struct tap_softc *, 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 = VMNET;
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tp->tap_flags |= TAP_VMNET;
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} else
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name = TAP;
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unit &= TAPMAXUNIT;
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TAPDEBUG("tapcreate(%s%d). minor = %#x\n", name, unit, minor(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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bcopy(&macaddr_hi, &tp->arpcom.ac_enaddr[0], sizeof(short));
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bcopy(&ticks, &tp->arpcom.ac_enaddr[2], sizeof(long));
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tp->arpcom.ac_enaddr[5] = (u_char)unit;
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/* fill the rest and attach interface */
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ifp = &tp->tap_if;
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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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ifp->if_snd.ifq_maxlen = ifqmaxlen;
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dev->si_drv1 = tp;
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tp->tap_dev = dev;
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s = splimp();
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ether_ifattach(ifp, tp->arpcom.ac_enaddr);
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splx(s);
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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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TAPDEBUG("interface %s is created. minor = %#x\n",
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ifp->if_xname, minor(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(dev, flag, mode, td)
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struct cdev *dev;
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int flag;
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int mode;
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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 s;
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if (tapuopen == 0 && suser(td) != 0)
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return (EPERM);
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if ((dev2unit(dev) & CLONE_UNITMASK) > TAPMAXUNIT)
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return (ENXIO);
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/*
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* XXXRW: Non-atomic test-and-set of si_drv1. Currently protected
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* by Giant, but the race actually exists under memory pressure as
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* well even when running with Giant, as malloc() may sleep.
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*/
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tp = dev->si_drv1;
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if (tp == NULL) {
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tapcreate(dev);
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tp = dev->si_drv1;
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}
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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(tp->arpcom.ac_enaddr, 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_if;
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mtx_unlock(&tp->tap_mtx);
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s = splimp();
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ifp->if_flags |= IFF_RUNNING;
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ifp->if_flags &= ~IFF_OACTIVE;
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splx(s);
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TAPDEBUG("%s is open. minor = %#x\n", ifp->if_xname, minor(dev));
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return (0);
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} /* tapopen */
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/*
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* tapclose
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*
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* close the device - mark i/f down & delete routing info
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*/
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static int
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tapclose(dev, foo, bar, td)
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struct cdev *dev;
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int foo;
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int bar;
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struct thread *td;
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{
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struct ifaddr *ifa;
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struct tap_softc *tp = dev->si_drv1;
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struct ifnet *ifp = &tp->tap_if;
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int s;
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/* junk all pending output */
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IF_DRAIN(&ifp->if_snd);
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/*
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* do not bring the interface down, and do not anything with
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* interface, if we are in VMnet mode. just close the device.
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*/
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mtx_lock(&tp->tap_mtx);
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if (((tp->tap_flags & TAP_VMNET) == 0) && (ifp->if_flags & IFF_UP)) {
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mtx_unlock(&tp->tap_mtx);
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s = splimp();
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if_down(ifp);
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if (ifp->if_flags & IFF_RUNNING) {
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TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
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rtinit(ifa, (int)RTM_DELETE, 0);
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}
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if_purgeaddrs(ifp);
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ifp->if_flags &= ~IFF_RUNNING;
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}
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splx(s);
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} else
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mtx_unlock(&tp->tap_mtx);
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funsetown(&tp->tap_sigio);
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selwakeuppri(&tp->tap_rsel, PZERO+1);
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mtx_lock(&tp->tap_mtx);
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tp->tap_flags &= ~TAP_OPEN;
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tp->tap_pid = 0;
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mtx_unlock(&tp->tap_mtx);
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TAPDEBUG("%s is closed. minor = %#x\n",
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ifp->if_xname, minor(dev));
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return (0);
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} /* tapclose */
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/*
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* tapifinit
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*
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* network interface initialization function
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*/
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static void
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tapifinit(xtp)
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void *xtp;
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{
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struct tap_softc *tp = (struct tap_softc *)xtp;
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struct ifnet *ifp = &tp->tap_if;
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TAPDEBUG("initializing %s\n", ifp->if_xname);
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ifp->if_flags |= IFF_RUNNING;
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ifp->if_flags &= ~IFF_OACTIVE;
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/* attempt to start output */
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tapifstart(ifp);
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} /* tapifinit */
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/*
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* tapifioctl
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*
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* Process an ioctl request on network interface
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*/
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static int
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tapifioctl(ifp, cmd, data)
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struct ifnet *ifp;
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u_long cmd;
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caddr_t data;
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{
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struct tap_softc *tp = (struct tap_softc *)(ifp->if_softc);
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struct ifstat *ifs = NULL;
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int s, dummy;
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switch (cmd) {
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case SIOCSIFFLAGS: /* XXX -- just like vmnet does */
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case SIOCADDMULTI:
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case SIOCDELMULTI:
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break;
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case SIOCGIFSTATUS:
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s = splimp();
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ifs = (struct ifstat *)data;
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dummy = strlen(ifs->ascii);
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mtx_lock(&tp->tap_mtx);
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if (tp->tap_pid != 0 && dummy < sizeof(ifs->ascii))
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snprintf(ifs->ascii + dummy,
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sizeof(ifs->ascii) - dummy,
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"\tOpened by PID %d\n", tp->tap_pid);
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mtx_unlock(&tp->tap_mtx);
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splx(s);
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break;
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default:
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s = splimp();
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dummy = ether_ioctl(ifp, cmd, data);
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splx(s);
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return (dummy);
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}
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return (0);
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} /* tapifioctl */
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/*
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* tapifstart
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*
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* queue packets from higher level ready to put out
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*/
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static void
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tapifstart(ifp)
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struct ifnet *ifp;
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{
|
|
struct tap_softc *tp = ifp->if_softc;
|
|
int s;
|
|
|
|
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 = NULL;
|
|
|
|
mtx_unlock(&tp->tap_mtx);
|
|
|
|
/* Unlocked read. */
|
|
TAPDEBUG("%s not ready, tap_flags = 0x%x\n", ifp->if_xname,
|
|
tp->tap_flags);
|
|
|
|
s = splimp();
|
|
do {
|
|
IF_DEQUEUE(&ifp->if_snd, m);
|
|
if (m != NULL)
|
|
m_freem(m);
|
|
ifp->if_oerrors ++;
|
|
} while (m != NULL);
|
|
splx(s);
|
|
|
|
return;
|
|
}
|
|
mtx_unlock(&tp->tap_mtx);
|
|
|
|
s = splimp();
|
|
ifp->if_flags |= IFF_OACTIVE;
|
|
|
|
if (ifp->if_snd.ifq_len != 0) {
|
|
mtx_lock(&tp->tap_mtx);
|
|
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);
|
|
} else
|
|
mtx_unlock(&tp->tap_mtx);
|
|
|
|
selwakeuppri(&tp->tap_rsel, PZERO+1);
|
|
ifp->if_opackets ++; /* obytes are counted in ether_output */
|
|
}
|
|
|
|
ifp->if_flags &= ~IFF_OACTIVE;
|
|
splx(s);
|
|
} /* tapifstart */
|
|
|
|
|
|
/*
|
|
* tapioctl
|
|
*
|
|
* the cdevsw interface is now pretty minimal
|
|
*/
|
|
static int
|
|
tapioctl(dev, cmd, data, flag, td)
|
|
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_if;
|
|
struct tapinfo *tapp = NULL;
|
|
int s;
|
|
int f;
|
|
|
|
switch (cmd) {
|
|
case TAPSIFINFO:
|
|
s = splimp();
|
|
tapp = (struct tapinfo *)data;
|
|
ifp->if_mtu = tapp->mtu;
|
|
ifp->if_type = tapp->type;
|
|
ifp->if_baudrate = tapp->baudrate;
|
|
splx(s);
|
|
break;
|
|
|
|
case TAPGIFINFO:
|
|
tapp = (struct tapinfo *)data;
|
|
tapp->mtu = ifp->if_mtu;
|
|
tapp->type = ifp->if_type;
|
|
tapp->baudrate = ifp->if_baudrate;
|
|
break;
|
|
|
|
case TAPSDEBUG:
|
|
tapdebug = *(int *)data;
|
|
break;
|
|
|
|
case TAPGDEBUG:
|
|
*(int *)data = tapdebug;
|
|
break;
|
|
|
|
case FIONBIO:
|
|
break;
|
|
|
|
case FIOASYNC:
|
|
s = splimp();
|
|
mtx_lock(&tp->tap_mtx);
|
|
if (*(int *)data)
|
|
tp->tap_flags |= TAP_ASYNC;
|
|
else
|
|
tp->tap_flags &= ~TAP_ASYNC;
|
|
mtx_unlock(&tp->tap_mtx);
|
|
splx(s);
|
|
break;
|
|
|
|
case FIONREAD:
|
|
s = splimp();
|
|
if (ifp->if_snd.ifq_head) {
|
|
struct mbuf *mb = ifp->if_snd.ifq_head;
|
|
|
|
for(*(int *)data = 0;mb != NULL;mb = mb->m_next)
|
|
*(int *)data += mb->m_len;
|
|
} else
|
|
*(int *)data = 0;
|
|
splx(s);
|
|
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 */
|
|
|
|
case SIOCGIFFLAGS: /* get ifnet flags */
|
|
bcopy(&ifp->if_flags, data, sizeof(ifp->if_flags));
|
|
break;
|
|
|
|
case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */
|
|
f = *(int *)data;
|
|
f &= 0x0fff;
|
|
f &= ~IFF_CANTCHANGE;
|
|
f |= IFF_UP;
|
|
|
|
s = splimp();
|
|
ifp->if_flags = f | (ifp->if_flags & IFF_CANTCHANGE);
|
|
splx(s);
|
|
break;
|
|
|
|
case OSIOCGIFADDR: /* get MAC address of the remote side */
|
|
case SIOCGIFADDR:
|
|
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(dev, uio, flag)
|
|
struct cdev *dev;
|
|
struct uio *uio;
|
|
int flag;
|
|
{
|
|
struct tap_softc *tp = dev->si_drv1;
|
|
struct ifnet *ifp = &tp->tap_if;
|
|
struct mbuf *m = NULL;
|
|
int error = 0, len, s;
|
|
|
|
TAPDEBUG("%s reading, minor = %#x\n", ifp->if_xname, minor(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, minor(dev), tp->tap_flags);
|
|
|
|
return (EHOSTDOWN);
|
|
}
|
|
|
|
tp->tap_flags &= ~TAP_RWAIT;
|
|
mtx_unlock(&tp->tap_mtx);
|
|
|
|
/* sleep until we get a packet */
|
|
do {
|
|
s = splimp();
|
|
IF_DEQUEUE(&ifp->if_snd, m);
|
|
splx(s);
|
|
|
|
if (m == NULL) {
|
|
if (flag & O_NONBLOCK)
|
|
return (EWOULDBLOCK);
|
|
|
|
mtx_lock(&tp->tap_mtx);
|
|
tp->tap_flags |= TAP_RWAIT;
|
|
mtx_unlock(&tp->tap_mtx);
|
|
error = tsleep(tp,PCATCH|(PZERO+1),"taprd",0);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
} while (m == NULL);
|
|
|
|
/* 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,
|
|
minor(dev));
|
|
m_freem(m);
|
|
}
|
|
|
|
return (error);
|
|
} /* tapread */
|
|
|
|
|
|
/*
|
|
* tapwrite
|
|
*
|
|
* the cdevsw write interface - an atomic write is a packet - or else!
|
|
*/
|
|
static int
|
|
tapwrite(dev, uio, flag)
|
|
struct cdev *dev;
|
|
struct uio *uio;
|
|
int flag;
|
|
{
|
|
struct tap_softc *tp = dev->si_drv1;
|
|
struct ifnet *ifp = &tp->tap_if;
|
|
struct mbuf *m;
|
|
int error = 0;
|
|
|
|
TAPDEBUG("%s writting, minor = %#x\n",
|
|
ifp->if_xname, minor(dev));
|
|
|
|
if (uio->uio_resid == 0)
|
|
return (0);
|
|
|
|
if ((uio->uio_resid < 0) || (uio->uio_resid > TAPMRU)) {
|
|
TAPDEBUG("%s invalid packet len = %d, minor = %#x\n",
|
|
ifp->if_xname, uio->uio_resid, minor(dev));
|
|
|
|
return (EIO);
|
|
}
|
|
|
|
if ((m = m_uiotombuf(uio, M_DONTWAIT, 0, ETHER_ALIGN)) == NULL) {
|
|
ifp->if_ierrors ++;
|
|
return (error);
|
|
}
|
|
|
|
m->m_pkthdr.rcvif = ifp;
|
|
|
|
/* Pass packet up to parent. */
|
|
(*ifp->if_input)(ifp, m);
|
|
ifp->if_ipackets ++; /* 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(dev, events, td)
|
|
struct cdev *dev;
|
|
int events;
|
|
struct thread *td;
|
|
{
|
|
struct tap_softc *tp = dev->si_drv1;
|
|
struct ifnet *ifp = &tp->tap_if;
|
|
int s, revents = 0;
|
|
|
|
TAPDEBUG("%s polling, minor = %#x\n",
|
|
ifp->if_xname, minor(dev));
|
|
|
|
s = splimp();
|
|
if (events & (POLLIN | POLLRDNORM)) {
|
|
if (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, minor(dev));
|
|
|
|
revents |= (events & (POLLIN | POLLRDNORM));
|
|
} else {
|
|
TAPDEBUG("%s waiting for data, minor = %#x\n",
|
|
ifp->if_xname, minor(dev));
|
|
|
|
selrecord(td, &tp->tap_rsel);
|
|
}
|
|
}
|
|
|
|
if (events & (POLLOUT | POLLWRNORM))
|
|
revents |= (events & (POLLOUT | POLLWRNORM));
|
|
|
|
splx(s);
|
|
return (revents);
|
|
} /* tappoll */
|