200abb43c0
Simply adding MODULE_VERSION does not do the trick, because the modules haven't been declared. This should actually fix modfind/kldstat, which r351229 aimed and failed to do. This should make vm-bhyve do the right thing again when using the ports version, rather than the latest version not in ports. MFC after: 3 days
2043 lines
48 KiB
C
2043 lines
48 KiB
C
/* $NetBSD: if_tun.c,v 1.14 1994/06/29 06:36:25 cgd Exp $ */
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/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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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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* Copyright (c) 2019 Kyle Evans <kevans@FreeBSD.org>
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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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*
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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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* This source may be freely distributed, however I would be interested
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* in any changes that are made.
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*
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* This driver takes packets off the IP i/f and hands them up to a
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* user process to have its wicked way with. This driver has it's
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* roots in a similar driver written by Phil Cockcroft (formerly) at
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* UCL. This driver is based much more on read/write/poll mode of
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* operation though.
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*
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* $FreeBSD$
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*/
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include <sys/param.h>
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#include <sys/lock.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <sys/jail.h>
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#include <sys/mbuf.h>
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#include <sys/module.h>
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#include <sys/socket.h>
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#include <sys/eventhandler.h>
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#include <sys/fcntl.h>
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#include <sys/filio.h>
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#include <sys/sockio.h>
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#include <sys/sx.h>
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#include <sys/syslog.h>
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#include <sys/ttycom.h>
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#include <sys/poll.h>
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#include <sys/selinfo.h>
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#include <sys/signalvar.h>
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#include <sys/filedesc.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <sys/conf.h>
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#include <sys/uio.h>
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#include <sys/malloc.h>
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#include <sys/random.h>
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#include <sys/ctype.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/if_vlan_var.h>
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#include <net/netisr.h>
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#include <net/route.h>
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#include <net/vnet.h>
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#ifdef INET
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet/udp.h>
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#include <netinet/tcp.h>
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#endif
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#include <net/bpf.h>
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#include <net/if_tap.h>
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#include <net/if_tun.h>
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#include <dev/virtio/network/virtio_net.h>
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#include <sys/queue.h>
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#include <sys/condvar.h>
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#include <security/mac/mac_framework.h>
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struct tuntap_driver;
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/*
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* tun_list is protected by global tunmtx. Other mutable fields are
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* protected by tun->tun_mtx, or by their owning subsystem. tun_dev is
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* static for the duration of a tunnel interface.
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*/
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struct tuntap_softc {
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TAILQ_ENTRY(tuntap_softc) tun_list;
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struct cdev *tun_alias;
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struct cdev *tun_dev;
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u_short tun_flags; /* misc flags */
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#define TUN_OPEN 0x0001
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#define TUN_INITED 0x0002
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#define TUN_UNUSED1 0x0008
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#define TUN_DSTADDR 0x0010
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#define TUN_LMODE 0x0020
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#define TUN_RWAIT 0x0040
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#define TUN_ASYNC 0x0080
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#define TUN_IFHEAD 0x0100
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#define TUN_DYING 0x0200
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#define TUN_L2 0x0400
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#define TUN_VMNET 0x0800
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#define TUN_DRIVER_IDENT_MASK (TUN_L2 | TUN_VMNET)
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#define TUN_READY (TUN_OPEN | TUN_INITED)
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pid_t tun_pid; /* owning pid */
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struct ifnet *tun_ifp; /* the interface */
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struct sigio *tun_sigio; /* async I/O info */
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struct tuntap_driver *tun_drv; /* appropriate driver */
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struct selinfo tun_rsel; /* read select */
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struct mtx tun_mtx; /* softc field mutex */
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struct cv tun_cv; /* for ref'd dev destroy */
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struct ether_addr tun_ether; /* remote address */
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int tun_busy; /* busy count */
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int tun_vhdrlen; /* virtio-net header length */
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};
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#define TUN2IFP(sc) ((sc)->tun_ifp)
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#define TUNDEBUG if (tundebug) if_printf
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#define TUN_LOCK(tp) mtx_lock(&(tp)->tun_mtx)
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#define TUN_UNLOCK(tp) mtx_unlock(&(tp)->tun_mtx)
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#define TUN_LOCK_ASSERT(tp) mtx_assert(&(tp)->tun_mtx, MA_OWNED);
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#define TUN_VMIO_FLAG_MASK 0x0fff
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/*
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* Interface capabilities of a tap device that supports the virtio-net
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* header.
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*/
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#define TAP_VNET_HDR_CAPS (IFCAP_HWCSUM | IFCAP_HWCSUM_IPV6 \
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| IFCAP_VLAN_HWCSUM \
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| IFCAP_TSO | IFCAP_LRO \
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| IFCAP_VLAN_HWTSO)
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#define TAP_ALL_OFFLOAD (CSUM_TSO | CSUM_TCP | CSUM_UDP |\
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CSUM_TCP_IPV6 | CSUM_UDP_IPV6)
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/*
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* All mutable global variables in if_tun are locked using tunmtx, with
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* the exception of tundebug, which is used unlocked, and the drivers' *clones,
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* which are static after setup.
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*/
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static struct mtx tunmtx;
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static eventhandler_tag arrival_tag;
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static eventhandler_tag clone_tag;
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static const char tunname[] = "tun";
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static const char tapname[] = "tap";
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static const char vmnetname[] = "vmnet";
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static MALLOC_DEFINE(M_TUN, tunname, "Tunnel Interface");
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static int tundebug = 0;
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static int tundclone = 1;
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static int tap_allow_uopen = 0; /* allow user devfs cloning */
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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 TAILQ_HEAD(,tuntap_softc) tunhead = TAILQ_HEAD_INITIALIZER(tunhead);
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SYSCTL_INT(_debug, OID_AUTO, if_tun_debug, CTLFLAG_RW, &tundebug, 0, "");
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static struct sx tun_ioctl_sx;
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SX_SYSINIT(tun_ioctl_sx, &tun_ioctl_sx, "tun_ioctl");
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SYSCTL_DECL(_net_link);
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/* tun */
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static SYSCTL_NODE(_net_link, OID_AUTO, tun, CTLFLAG_RW, 0,
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"IP tunnel software network interface");
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SYSCTL_INT(_net_link_tun, OID_AUTO, devfs_cloning, CTLFLAG_RWTUN, &tundclone, 0,
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"Enable legacy devfs interface creation");
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/* tap */
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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, &tap_allow_uopen, 0,
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"Enable legacy devfs interface creation for all users");
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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, &tundebug, 0, "");
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static int tun_create_device(struct tuntap_driver *drv, int unit,
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struct ucred *cr, struct cdev **dev, const char *name);
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static int tun_busy_locked(struct tuntap_softc *tp);
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static void tun_unbusy_locked(struct tuntap_softc *tp);
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static int tun_busy(struct tuntap_softc *tp);
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static void tun_unbusy(struct tuntap_softc *tp);
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static int tuntap_name2info(const char *name, int *unit, int *flags);
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static void tunclone(void *arg, struct ucred *cred, char *name,
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int namelen, struct cdev **dev);
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static void tuncreate(struct cdev *dev);
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static void tundtor(void *data);
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static void tunrename(void *arg, struct ifnet *ifp);
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static int tunifioctl(struct ifnet *, u_long, caddr_t);
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static void tuninit(struct ifnet *);
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static void tunifinit(void *xtp);
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static int tuntapmodevent(module_t, int, void *);
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static int tunoutput(struct ifnet *, struct mbuf *,
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const struct sockaddr *, struct route *ro);
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static void tunstart(struct ifnet *);
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static void tunstart_l2(struct ifnet *);
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static int tun_clone_match(struct if_clone *ifc, const char *name);
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static int tap_clone_match(struct if_clone *ifc, const char *name);
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static int vmnet_clone_match(struct if_clone *ifc, const char *name);
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static int tun_clone_create(struct if_clone *, char *, size_t, caddr_t);
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static int tun_clone_destroy(struct if_clone *, struct ifnet *);
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static void tun_vnethdr_set(struct ifnet *ifp, int vhdrlen);
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static d_open_t tunopen;
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static d_read_t tunread;
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static d_write_t tunwrite;
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static d_ioctl_t tunioctl;
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static d_poll_t tunpoll;
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static d_kqfilter_t tunkqfilter;
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static int tunkqread(struct knote *, long);
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static int tunkqwrite(struct knote *, long);
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static void tunkqdetach(struct knote *);
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static struct filterops tun_read_filterops = {
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.f_isfd = 1,
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.f_attach = NULL,
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.f_detach = tunkqdetach,
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.f_event = tunkqread,
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};
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static struct filterops tun_write_filterops = {
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.f_isfd = 1,
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.f_attach = NULL,
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.f_detach = tunkqdetach,
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.f_event = tunkqwrite,
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};
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static struct tuntap_driver {
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struct cdevsw cdevsw;
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int ident_flags;
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struct unrhdr *unrhdr;
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struct clonedevs *clones;
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ifc_match_t *clone_match_fn;
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ifc_create_t *clone_create_fn;
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ifc_destroy_t *clone_destroy_fn;
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} tuntap_drivers[] = {
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{
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.ident_flags = 0,
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.cdevsw = {
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.d_version = D_VERSION,
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.d_flags = D_NEEDMINOR,
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.d_open = tunopen,
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.d_read = tunread,
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.d_write = tunwrite,
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.d_ioctl = tunioctl,
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.d_poll = tunpoll,
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.d_kqfilter = tunkqfilter,
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.d_name = tunname,
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},
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.clone_match_fn = tun_clone_match,
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.clone_create_fn = tun_clone_create,
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.clone_destroy_fn = tun_clone_destroy,
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},
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{
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.ident_flags = TUN_L2,
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.cdevsw = {
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.d_version = D_VERSION,
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.d_flags = D_NEEDMINOR,
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.d_open = tunopen,
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.d_read = tunread,
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.d_write = tunwrite,
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.d_ioctl = tunioctl,
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.d_poll = tunpoll,
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.d_kqfilter = tunkqfilter,
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.d_name = tapname,
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},
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.clone_match_fn = tap_clone_match,
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.clone_create_fn = tun_clone_create,
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.clone_destroy_fn = tun_clone_destroy,
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},
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{
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.ident_flags = TUN_L2 | TUN_VMNET,
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.cdevsw = {
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.d_version = D_VERSION,
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.d_flags = D_NEEDMINOR,
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.d_open = tunopen,
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.d_read = tunread,
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.d_write = tunwrite,
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.d_ioctl = tunioctl,
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.d_poll = tunpoll,
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.d_kqfilter = tunkqfilter,
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.d_name = vmnetname,
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},
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.clone_match_fn = vmnet_clone_match,
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.clone_create_fn = tun_clone_create,
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.clone_destroy_fn = tun_clone_destroy,
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},
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};
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struct tuntap_driver_cloner {
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SLIST_ENTRY(tuntap_driver_cloner) link;
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struct tuntap_driver *drv;
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struct if_clone *cloner;
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};
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VNET_DEFINE_STATIC(SLIST_HEAD(, tuntap_driver_cloner), tuntap_driver_cloners) =
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SLIST_HEAD_INITIALIZER(tuntap_driver_cloners);
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#define V_tuntap_driver_cloners VNET(tuntap_driver_cloners)
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/*
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* Mechanism for marking a tunnel device as busy so that we can safely do some
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* orthogonal operations (such as operations on devices) without racing against
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* tun_destroy. tun_destroy will wait on the condvar if we're at all busy or
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* open, to be woken up when the condition is alleviated.
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*/
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static int
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tun_busy_locked(struct tuntap_softc *tp)
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{
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TUN_LOCK_ASSERT(tp);
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if ((tp->tun_flags & TUN_DYING) != 0) {
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/*
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* Perhaps unintuitive, but the device is busy going away.
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* Other interpretations of EBUSY from tun_busy make little
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* sense, since making a busy device even more busy doesn't
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* sound like a problem.
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*/
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return (EBUSY);
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}
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++tp->tun_busy;
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return (0);
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}
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static void
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tun_unbusy_locked(struct tuntap_softc *tp)
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{
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TUN_LOCK_ASSERT(tp);
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KASSERT(tp->tun_busy != 0, ("tun_unbusy: called for non-busy tunnel"));
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--tp->tun_busy;
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/* Wake up anything that may be waiting on our busy tunnel. */
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if (tp->tun_busy == 0)
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cv_broadcast(&tp->tun_cv);
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}
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static int
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tun_busy(struct tuntap_softc *tp)
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{
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int ret;
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TUN_LOCK(tp);
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ret = tun_busy_locked(tp);
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TUN_UNLOCK(tp);
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return (ret);
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}
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static void
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tun_unbusy(struct tuntap_softc *tp)
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{
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|
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TUN_LOCK(tp);
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tun_unbusy_locked(tp);
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TUN_UNLOCK(tp);
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}
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|
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/*
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* Sets unit and/or flags given the device name. Must be called with correct
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* vnet context.
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*/
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static int
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tuntap_name2info(const char *name, int *outunit, int *outflags)
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{
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struct tuntap_driver *drv;
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struct tuntap_driver_cloner *drvc;
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char *dname;
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int flags, unit;
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bool found;
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if (name == NULL)
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return (EINVAL);
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|
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/*
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* Needed for dev_stdclone, but dev_stdclone will not modify, it just
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* wants to be able to pass back a char * through the second param. We
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* will always set that as NULL here, so we'll fake it.
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*/
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dname = __DECONST(char *, name);
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found = false;
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KASSERT(!SLIST_EMPTY(&V_tuntap_driver_cloners),
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("tuntap_driver_cloners failed to initialize"));
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SLIST_FOREACH(drvc, &V_tuntap_driver_cloners, link) {
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KASSERT(drvc->drv != NULL,
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("tuntap_driver_cloners entry not properly initialized"));
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drv = drvc->drv;
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if (strcmp(name, drv->cdevsw.d_name) == 0) {
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found = true;
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unit = -1;
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flags = drv->ident_flags;
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break;
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}
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if (dev_stdclone(dname, NULL, drv->cdevsw.d_name, &unit) == 1) {
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found = true;
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flags = drv->ident_flags;
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break;
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}
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}
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|
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if (!found)
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return (ENXIO);
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|
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if (outunit != NULL)
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*outunit = unit;
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if (outflags != NULL)
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*outflags = flags;
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return (0);
|
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}
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|
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/*
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* Get driver information from a set of flags specified. Masks the identifying
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* part of the flags and compares it against all of the available
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* tuntap_drivers. Must be called with correct vnet context.
|
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*/
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static struct tuntap_driver *
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tuntap_driver_from_flags(int tun_flags)
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{
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struct tuntap_driver *drv;
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struct tuntap_driver_cloner *drvc;
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|
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KASSERT(!SLIST_EMPTY(&V_tuntap_driver_cloners),
|
|
("tuntap_driver_cloners failed to initialize"));
|
|
SLIST_FOREACH(drvc, &V_tuntap_driver_cloners, link) {
|
|
KASSERT(drvc->drv != NULL,
|
|
("tuntap_driver_cloners entry not properly initialized"));
|
|
drv = drvc->drv;
|
|
if ((tun_flags & TUN_DRIVER_IDENT_MASK) == drv->ident_flags)
|
|
return (drv);
|
|
}
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
tun_clone_match(struct if_clone *ifc, const char *name)
|
|
{
|
|
int tunflags;
|
|
|
|
if (tuntap_name2info(name, NULL, &tunflags) == 0) {
|
|
if ((tunflags & TUN_L2) == 0)
|
|
return (1);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
tap_clone_match(struct if_clone *ifc, const char *name)
|
|
{
|
|
int tunflags;
|
|
|
|
if (tuntap_name2info(name, NULL, &tunflags) == 0) {
|
|
if ((tunflags & (TUN_L2 | TUN_VMNET)) == TUN_L2)
|
|
return (1);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
vmnet_clone_match(struct if_clone *ifc, const char *name)
|
|
{
|
|
int tunflags;
|
|
|
|
if (tuntap_name2info(name, NULL, &tunflags) == 0) {
|
|
if ((tunflags & TUN_VMNET) != 0)
|
|
return (1);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
tun_clone_create(struct if_clone *ifc, char *name, size_t len, caddr_t params)
|
|
{
|
|
struct tuntap_driver *drv;
|
|
struct cdev *dev;
|
|
int err, i, tunflags, unit;
|
|
|
|
tunflags = 0;
|
|
/* The name here tells us exactly what we're creating */
|
|
err = tuntap_name2info(name, &unit, &tunflags);
|
|
if (err != 0)
|
|
return (err);
|
|
|
|
drv = tuntap_driver_from_flags(tunflags);
|
|
if (drv == NULL)
|
|
return (ENXIO);
|
|
|
|
if (unit != -1) {
|
|
/* If this unit number is still available that's okay. */
|
|
if (alloc_unr_specific(drv->unrhdr, unit) == -1)
|
|
return (EEXIST);
|
|
} else {
|
|
unit = alloc_unr(drv->unrhdr);
|
|
}
|
|
|
|
snprintf(name, IFNAMSIZ, "%s%d", drv->cdevsw.d_name, unit);
|
|
|
|
/* find any existing device, or allocate new unit number */
|
|
dev = NULL;
|
|
i = clone_create(&drv->clones, &drv->cdevsw, &unit, &dev, 0);
|
|
/* No preexisting struct cdev *, create one */
|
|
if (i != 0)
|
|
i = tun_create_device(drv, unit, NULL, &dev, name);
|
|
if (i == 0)
|
|
tuncreate(dev);
|
|
|
|
return (i);
|
|
}
|
|
|
|
static void
|
|
tunclone(void *arg, struct ucred *cred, char *name, int namelen,
|
|
struct cdev **dev)
|
|
{
|
|
char devname[SPECNAMELEN + 1];
|
|
struct tuntap_driver *drv;
|
|
int append_unit, i, u, tunflags;
|
|
bool mayclone;
|
|
|
|
if (*dev != NULL)
|
|
return;
|
|
|
|
tunflags = 0;
|
|
CURVNET_SET(CRED_TO_VNET(cred));
|
|
if (tuntap_name2info(name, &u, &tunflags) != 0)
|
|
goto out; /* Not recognized */
|
|
|
|
if (u != -1 && u > IF_MAXUNIT)
|
|
goto out; /* Unit number too high */
|
|
|
|
mayclone = priv_check_cred(cred, PRIV_NET_IFCREATE) == 0;
|
|
if ((tunflags & TUN_L2) != 0) {
|
|
/* tap/vmnet allow user open with a sysctl */
|
|
mayclone = (mayclone || tap_allow_uopen) && tapdclone;
|
|
} else {
|
|
mayclone = mayclone && tundclone;
|
|
}
|
|
|
|
/*
|
|
* If tun cloning is enabled, only the superuser can create an
|
|
* interface.
|
|
*/
|
|
if (!mayclone)
|
|
goto out;
|
|
|
|
if (u == -1)
|
|
append_unit = 1;
|
|
else
|
|
append_unit = 0;
|
|
|
|
drv = tuntap_driver_from_flags(tunflags);
|
|
if (drv == NULL)
|
|
goto out;
|
|
|
|
/* find any existing device, or allocate new unit number */
|
|
i = clone_create(&drv->clones, &drv->cdevsw, &u, dev, 0);
|
|
if (i) {
|
|
if (append_unit) {
|
|
namelen = snprintf(devname, sizeof(devname), "%s%d",
|
|
name, u);
|
|
name = devname;
|
|
}
|
|
|
|
i = tun_create_device(drv, u, cred, dev, name);
|
|
}
|
|
if (i == 0)
|
|
if_clone_create(name, namelen, NULL);
|
|
out:
|
|
CURVNET_RESTORE();
|
|
}
|
|
|
|
static void
|
|
tun_destroy(struct tuntap_softc *tp)
|
|
{
|
|
|
|
TUN_LOCK(tp);
|
|
tp->tun_flags |= TUN_DYING;
|
|
if (tp->tun_busy != 0)
|
|
cv_wait_unlock(&tp->tun_cv, &tp->tun_mtx);
|
|
else
|
|
TUN_UNLOCK(tp);
|
|
|
|
CURVNET_SET(TUN2IFP(tp)->if_vnet);
|
|
|
|
/* destroy_dev will take care of any alias. */
|
|
destroy_dev(tp->tun_dev);
|
|
seldrain(&tp->tun_rsel);
|
|
knlist_clear(&tp->tun_rsel.si_note, 0);
|
|
knlist_destroy(&tp->tun_rsel.si_note);
|
|
if ((tp->tun_flags & TUN_L2) != 0) {
|
|
ether_ifdetach(TUN2IFP(tp));
|
|
} else {
|
|
bpfdetach(TUN2IFP(tp));
|
|
if_detach(TUN2IFP(tp));
|
|
}
|
|
sx_xlock(&tun_ioctl_sx);
|
|
TUN2IFP(tp)->if_softc = NULL;
|
|
sx_xunlock(&tun_ioctl_sx);
|
|
free_unr(tp->tun_drv->unrhdr, TUN2IFP(tp)->if_dunit);
|
|
if_free(TUN2IFP(tp));
|
|
mtx_destroy(&tp->tun_mtx);
|
|
cv_destroy(&tp->tun_cv);
|
|
free(tp, M_TUN);
|
|
CURVNET_RESTORE();
|
|
}
|
|
|
|
static int
|
|
tun_clone_destroy(struct if_clone *ifc __unused, struct ifnet *ifp)
|
|
{
|
|
struct tuntap_softc *tp = ifp->if_softc;
|
|
|
|
mtx_lock(&tunmtx);
|
|
TAILQ_REMOVE(&tunhead, tp, tun_list);
|
|
mtx_unlock(&tunmtx);
|
|
tun_destroy(tp);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
vnet_tun_init(const void *unused __unused)
|
|
{
|
|
struct tuntap_driver *drv;
|
|
struct tuntap_driver_cloner *drvc;
|
|
int i;
|
|
|
|
for (i = 0; i < nitems(tuntap_drivers); ++i) {
|
|
drv = &tuntap_drivers[i];
|
|
drvc = malloc(sizeof(*drvc), M_TUN, M_WAITOK | M_ZERO);
|
|
|
|
drvc->drv = drv;
|
|
drvc->cloner = if_clone_advanced(drv->cdevsw.d_name, 0,
|
|
drv->clone_match_fn, drv->clone_create_fn,
|
|
drv->clone_destroy_fn);
|
|
SLIST_INSERT_HEAD(&V_tuntap_driver_cloners, drvc, link);
|
|
};
|
|
}
|
|
VNET_SYSINIT(vnet_tun_init, SI_SUB_PROTO_IF, SI_ORDER_ANY,
|
|
vnet_tun_init, NULL);
|
|
|
|
static void
|
|
vnet_tun_uninit(const void *unused __unused)
|
|
{
|
|
struct tuntap_driver_cloner *drvc;
|
|
|
|
while (!SLIST_EMPTY(&V_tuntap_driver_cloners)) {
|
|
drvc = SLIST_FIRST(&V_tuntap_driver_cloners);
|
|
SLIST_REMOVE_HEAD(&V_tuntap_driver_cloners, link);
|
|
|
|
if_clone_detach(drvc->cloner);
|
|
free(drvc, M_TUN);
|
|
}
|
|
}
|
|
VNET_SYSUNINIT(vnet_tun_uninit, SI_SUB_PROTO_IF, SI_ORDER_ANY,
|
|
vnet_tun_uninit, NULL);
|
|
|
|
static void
|
|
tun_uninit(const void *unused __unused)
|
|
{
|
|
struct tuntap_driver *drv;
|
|
struct tuntap_softc *tp;
|
|
int i;
|
|
|
|
EVENTHANDLER_DEREGISTER(ifnet_arrival_event, arrival_tag);
|
|
EVENTHANDLER_DEREGISTER(dev_clone, clone_tag);
|
|
drain_dev_clone_events();
|
|
|
|
mtx_lock(&tunmtx);
|
|
while ((tp = TAILQ_FIRST(&tunhead)) != NULL) {
|
|
TAILQ_REMOVE(&tunhead, tp, tun_list);
|
|
mtx_unlock(&tunmtx);
|
|
tun_destroy(tp);
|
|
mtx_lock(&tunmtx);
|
|
}
|
|
mtx_unlock(&tunmtx);
|
|
for (i = 0; i < nitems(tuntap_drivers); ++i) {
|
|
drv = &tuntap_drivers[i];
|
|
delete_unrhdr(drv->unrhdr);
|
|
clone_cleanup(&drv->clones);
|
|
}
|
|
mtx_destroy(&tunmtx);
|
|
}
|
|
SYSUNINIT(tun_uninit, SI_SUB_PROTO_IF, SI_ORDER_ANY, tun_uninit, NULL);
|
|
|
|
static struct tuntap_driver *
|
|
tuntap_driver_from_ifnet(const struct ifnet *ifp)
|
|
{
|
|
struct tuntap_driver *drv;
|
|
int i;
|
|
|
|
if (ifp == NULL)
|
|
return (NULL);
|
|
|
|
for (i = 0; i < nitems(tuntap_drivers); ++i) {
|
|
drv = &tuntap_drivers[i];
|
|
if (strcmp(ifp->if_dname, drv->cdevsw.d_name) == 0)
|
|
return (drv);
|
|
}
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
static int
|
|
tuntapmodevent(module_t mod, int type, void *data)
|
|
{
|
|
struct tuntap_driver *drv;
|
|
int i;
|
|
|
|
switch (type) {
|
|
case MOD_LOAD:
|
|
mtx_init(&tunmtx, "tunmtx", NULL, MTX_DEF);
|
|
for (i = 0; i < nitems(tuntap_drivers); ++i) {
|
|
drv = &tuntap_drivers[i];
|
|
clone_setup(&drv->clones);
|
|
drv->unrhdr = new_unrhdr(0, IF_MAXUNIT, &tunmtx);
|
|
}
|
|
arrival_tag = EVENTHANDLER_REGISTER(ifnet_arrival_event,
|
|
tunrename, 0, 1000);
|
|
if (arrival_tag == NULL)
|
|
return (ENOMEM);
|
|
clone_tag = EVENTHANDLER_REGISTER(dev_clone, tunclone, 0, 1000);
|
|
if (clone_tag == NULL)
|
|
return (ENOMEM);
|
|
break;
|
|
case MOD_UNLOAD:
|
|
/* See tun_uninit, so it's done after the vnet_sysuninit() */
|
|
break;
|
|
default:
|
|
return EOPNOTSUPP;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static moduledata_t tuntap_mod = {
|
|
"if_tuntap",
|
|
tuntapmodevent,
|
|
0
|
|
};
|
|
|
|
/* We'll only ever have these two, so no need for a macro. */
|
|
static moduledata_t tun_mod = { "if_tun", NULL, 0 };
|
|
static moduledata_t tap_mod = { "if_tap", NULL, 0 };
|
|
|
|
DECLARE_MODULE(if_tuntap, tuntap_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
|
|
MODULE_VERSION(if_tuntap, 1);
|
|
DECLARE_MODULE(if_tun, tun_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
|
|
MODULE_VERSION(if_tun, 1);
|
|
DECLARE_MODULE(if_tap, tap_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
|
|
MODULE_VERSION(if_tap, 1);
|
|
|
|
static int
|
|
tun_create_device(struct tuntap_driver *drv, int unit, struct ucred *cr,
|
|
struct cdev **dev, const char *name)
|
|
{
|
|
struct make_dev_args args;
|
|
struct tuntap_softc *tp;
|
|
int error;
|
|
|
|
tp = malloc(sizeof(*tp), M_TUN, M_WAITOK | M_ZERO);
|
|
mtx_init(&tp->tun_mtx, "tun_mtx", NULL, MTX_DEF);
|
|
cv_init(&tp->tun_cv, "tun_condvar");
|
|
tp->tun_flags = drv->ident_flags;
|
|
tp->tun_drv = drv;
|
|
|
|
make_dev_args_init(&args);
|
|
if (cr != NULL)
|
|
args.mda_flags = MAKEDEV_REF;
|
|
args.mda_devsw = &drv->cdevsw;
|
|
args.mda_cr = cr;
|
|
args.mda_uid = UID_UUCP;
|
|
args.mda_gid = GID_DIALER;
|
|
args.mda_mode = 0600;
|
|
args.mda_unit = unit;
|
|
args.mda_si_drv1 = tp;
|
|
error = make_dev_s(&args, dev, "%s", name);
|
|
if (error != 0) {
|
|
free(tp, M_TUN);
|
|
return (error);
|
|
}
|
|
|
|
KASSERT((*dev)->si_drv1 != NULL,
|
|
("Failed to set si_drv1 at %s creation", name));
|
|
tp->tun_dev = *dev;
|
|
knlist_init_mtx(&tp->tun_rsel.si_note, &tp->tun_mtx);
|
|
mtx_lock(&tunmtx);
|
|
TAILQ_INSERT_TAIL(&tunhead, tp, tun_list);
|
|
mtx_unlock(&tunmtx);
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
tunstart(struct ifnet *ifp)
|
|
{
|
|
struct tuntap_softc *tp = ifp->if_softc;
|
|
struct mbuf *m;
|
|
|
|
TUNDEBUG(ifp, "starting\n");
|
|
if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
|
|
IFQ_LOCK(&ifp->if_snd);
|
|
IFQ_POLL_NOLOCK(&ifp->if_snd, m);
|
|
if (m == NULL) {
|
|
IFQ_UNLOCK(&ifp->if_snd);
|
|
return;
|
|
}
|
|
IFQ_UNLOCK(&ifp->if_snd);
|
|
}
|
|
|
|
TUN_LOCK(tp);
|
|
if (tp->tun_flags & TUN_RWAIT) {
|
|
tp->tun_flags &= ~TUN_RWAIT;
|
|
wakeup(tp);
|
|
}
|
|
selwakeuppri(&tp->tun_rsel, PZERO + 1);
|
|
KNOTE_LOCKED(&tp->tun_rsel.si_note, 0);
|
|
if (tp->tun_flags & TUN_ASYNC && tp->tun_sigio) {
|
|
TUN_UNLOCK(tp);
|
|
pgsigio(&tp->tun_sigio, SIGIO, 0);
|
|
} else
|
|
TUN_UNLOCK(tp);
|
|
}
|
|
|
|
/*
|
|
* tunstart_l2
|
|
*
|
|
* queue packets from higher level ready to put out
|
|
*/
|
|
static void
|
|
tunstart_l2(struct ifnet *ifp)
|
|
{
|
|
struct tuntap_softc *tp = ifp->if_softc;
|
|
|
|
TUNDEBUG(ifp, "starting\n");
|
|
|
|
/*
|
|
* do not junk pending output if we are in VMnet mode.
|
|
* XXX: can this do any harm because of queue overflow?
|
|
*/
|
|
|
|
TUN_LOCK(tp);
|
|
if (((tp->tun_flags & TUN_VMNET) == 0) &&
|
|
((tp->tun_flags & TUN_READY) != TUN_READY)) {
|
|
struct mbuf *m;
|
|
|
|
/* Unlocked read. */
|
|
TUNDEBUG(ifp, "not ready, tun_flags = 0x%x\n", tp->tun_flags);
|
|
|
|
for (;;) {
|
|
IF_DEQUEUE(&ifp->if_snd, m);
|
|
if (m != NULL) {
|
|
m_freem(m);
|
|
if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
|
|
} else
|
|
break;
|
|
}
|
|
TUN_UNLOCK(tp);
|
|
|
|
return;
|
|
}
|
|
|
|
ifp->if_drv_flags |= IFF_DRV_OACTIVE;
|
|
|
|
if (!IFQ_IS_EMPTY(&ifp->if_snd)) {
|
|
if (tp->tun_flags & TUN_RWAIT) {
|
|
tp->tun_flags &= ~TUN_RWAIT;
|
|
wakeup(tp);
|
|
}
|
|
|
|
if ((tp->tun_flags & TUN_ASYNC) && (tp->tun_sigio != NULL)) {
|
|
TUN_UNLOCK(tp);
|
|
pgsigio(&tp->tun_sigio, SIGIO, 0);
|
|
TUN_LOCK(tp);
|
|
}
|
|
|
|
selwakeuppri(&tp->tun_rsel, PZERO+1);
|
|
KNOTE_LOCKED(&tp->tun_rsel.si_note, 0);
|
|
if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); /* obytes are counted in ether_output */
|
|
}
|
|
|
|
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
|
|
TUN_UNLOCK(tp);
|
|
} /* tunstart_l2 */
|
|
|
|
/* XXX: should return an error code so it can fail. */
|
|
static void
|
|
tuncreate(struct cdev *dev)
|
|
{
|
|
struct tuntap_driver *drv;
|
|
struct tuntap_softc *tp;
|
|
struct ifnet *ifp;
|
|
struct ether_addr eaddr;
|
|
int iflags;
|
|
u_char type;
|
|
|
|
tp = dev->si_drv1;
|
|
KASSERT(tp != NULL,
|
|
("si_drv1 should have been initialized at creation"));
|
|
|
|
drv = tp->tun_drv;
|
|
iflags = IFF_MULTICAST;
|
|
if ((tp->tun_flags & TUN_L2) != 0) {
|
|
type = IFT_ETHER;
|
|
iflags |= IFF_BROADCAST | IFF_SIMPLEX;
|
|
} else {
|
|
type = IFT_PPP;
|
|
iflags |= IFF_POINTOPOINT;
|
|
}
|
|
ifp = tp->tun_ifp = if_alloc(type);
|
|
if (ifp == NULL)
|
|
panic("%s%d: failed to if_alloc() interface.\n",
|
|
drv->cdevsw.d_name, dev2unit(dev));
|
|
ifp->if_softc = tp;
|
|
if_initname(ifp, drv->cdevsw.d_name, dev2unit(dev));
|
|
ifp->if_ioctl = tunifioctl;
|
|
ifp->if_flags = iflags;
|
|
IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
|
|
ifp->if_capabilities |= IFCAP_LINKSTATE;
|
|
ifp->if_capenable |= IFCAP_LINKSTATE;
|
|
|
|
if ((tp->tun_flags & TUN_L2) != 0) {
|
|
ifp->if_mtu = ETHERMTU;
|
|
ifp->if_init = tunifinit;
|
|
ifp->if_start = tunstart_l2;
|
|
|
|
ether_gen_addr(ifp, &eaddr);
|
|
ether_ifattach(ifp, eaddr.octet);
|
|
} else {
|
|
ifp->if_mtu = TUNMTU;
|
|
ifp->if_start = tunstart;
|
|
ifp->if_output = tunoutput;
|
|
|
|
ifp->if_snd.ifq_drv_maxlen = 0;
|
|
IFQ_SET_READY(&ifp->if_snd);
|
|
|
|
if_attach(ifp);
|
|
bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
|
|
}
|
|
|
|
TUN_LOCK(tp);
|
|
tp->tun_flags |= TUN_INITED;
|
|
TUN_UNLOCK(tp);
|
|
|
|
TUNDEBUG(ifp, "interface %s is created, minor = %#x\n",
|
|
ifp->if_xname, dev2unit(dev));
|
|
}
|
|
|
|
static void
|
|
tunrename(void *arg __unused, struct ifnet *ifp)
|
|
{
|
|
struct tuntap_softc *tp;
|
|
int error;
|
|
|
|
if ((ifp->if_flags & IFF_RENAMING) == 0)
|
|
return;
|
|
|
|
if (tuntap_driver_from_ifnet(ifp) == NULL)
|
|
return;
|
|
|
|
/*
|
|
* We need to grab the ioctl sx long enough to make sure the softc is
|
|
* still there. If it is, we can safely try to busy the tun device.
|
|
* The busy may fail if the device is currently dying, in which case
|
|
* we do nothing. If it doesn't fail, the busy count stops the device
|
|
* from dying until we've created the alias (that will then be
|
|
* subsequently destroyed).
|
|
*/
|
|
sx_xlock(&tun_ioctl_sx);
|
|
tp = ifp->if_softc;
|
|
if (tp == NULL) {
|
|
sx_xunlock(&tun_ioctl_sx);
|
|
return;
|
|
}
|
|
error = tun_busy(tp);
|
|
sx_xunlock(&tun_ioctl_sx);
|
|
if (error != 0)
|
|
return;
|
|
if (tp->tun_alias != NULL) {
|
|
destroy_dev(tp->tun_alias);
|
|
tp->tun_alias = NULL;
|
|
}
|
|
|
|
if (strcmp(ifp->if_xname, tp->tun_dev->si_name) == 0)
|
|
goto out;
|
|
|
|
/*
|
|
* Failure's ok, aliases are created on a best effort basis. If a
|
|
* tun user/consumer decides to rename the interface to conflict with
|
|
* another device (non-ifnet) on the system, we will assume they know
|
|
* what they are doing. make_dev_alias_p won't touch tun_alias on
|
|
* failure, so we use it but ignore the return value.
|
|
*/
|
|
make_dev_alias_p(MAKEDEV_CHECKNAME, &tp->tun_alias, tp->tun_dev, "%s",
|
|
ifp->if_xname);
|
|
out:
|
|
tun_unbusy(tp);
|
|
}
|
|
|
|
static int
|
|
tunopen(struct cdev *dev, int flag, int mode, struct thread *td)
|
|
{
|
|
struct ifnet *ifp;
|
|
struct tuntap_softc *tp;
|
|
int error, tunflags;
|
|
|
|
tunflags = 0;
|
|
CURVNET_SET(TD_TO_VNET(td));
|
|
error = tuntap_name2info(dev->si_name, NULL, &tunflags);
|
|
if (error != 0) {
|
|
CURVNET_RESTORE();
|
|
return (error); /* Shouldn't happen */
|
|
}
|
|
|
|
tp = dev->si_drv1;
|
|
KASSERT(tp != NULL,
|
|
("si_drv1 should have been initialized at creation"));
|
|
|
|
TUN_LOCK(tp);
|
|
if ((tp->tun_flags & TUN_INITED) == 0) {
|
|
TUN_UNLOCK(tp);
|
|
CURVNET_RESTORE();
|
|
return (ENXIO);
|
|
}
|
|
if ((tp->tun_flags & (TUN_OPEN | TUN_DYING)) != 0) {
|
|
TUN_UNLOCK(tp);
|
|
CURVNET_RESTORE();
|
|
return (EBUSY);
|
|
}
|
|
|
|
error = tun_busy_locked(tp);
|
|
KASSERT(error == 0, ("Must be able to busy an unopen tunnel"));
|
|
ifp = TUN2IFP(tp);
|
|
|
|
if ((tp->tun_flags & TUN_L2) != 0) {
|
|
bcopy(IF_LLADDR(ifp), tp->tun_ether.octet,
|
|
sizeof(tp->tun_ether.octet));
|
|
|
|
ifp->if_drv_flags |= IFF_DRV_RUNNING;
|
|
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
|
|
|
|
if (tapuponopen)
|
|
ifp->if_flags |= IFF_UP;
|
|
}
|
|
|
|
tp->tun_pid = td->td_proc->p_pid;
|
|
tp->tun_flags |= TUN_OPEN;
|
|
|
|
if_link_state_change(ifp, LINK_STATE_UP);
|
|
TUNDEBUG(ifp, "open\n");
|
|
TUN_UNLOCK(tp);
|
|
|
|
/*
|
|
* This can fail with either ENOENT or EBUSY. This is in the middle of
|
|
* d_open, so ENOENT should not be possible. EBUSY is possible, but
|
|
* the only cdevpriv dtor being set will be tundtor and the softc being
|
|
* passed is constant for a given cdev. We ignore the possible error
|
|
* because of this as either "unlikely" or "not actually a problem."
|
|
*/
|
|
(void)devfs_set_cdevpriv(tp, tundtor);
|
|
CURVNET_RESTORE();
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* tundtor - tear down the device - mark i/f down & delete
|
|
* routing info
|
|
*/
|
|
static void
|
|
tundtor(void *data)
|
|
{
|
|
struct proc *p;
|
|
struct tuntap_softc *tp;
|
|
struct ifnet *ifp;
|
|
bool l2tun;
|
|
|
|
tp = data;
|
|
p = curproc;
|
|
ifp = TUN2IFP(tp);
|
|
|
|
TUN_LOCK(tp);
|
|
|
|
/*
|
|
* Realistically, we can't be obstinate here. This only means that the
|
|
* tuntap device was closed out of order, and the last closer wasn't the
|
|
* controller. These are still good to know about, though, as software
|
|
* should avoid multiple processes with a tuntap device open and
|
|
* ill-defined transfer of control (e.g., handoff, TUNSIFPID, close in
|
|
* parent).
|
|
*/
|
|
if (p->p_pid != tp->tun_pid) {
|
|
log(LOG_INFO,
|
|
"pid %d (%s), %s: tun/tap protocol violation, non-controlling process closed last.\n",
|
|
p->p_pid, p->p_comm, tp->tun_dev->si_name);
|
|
}
|
|
|
|
/*
|
|
* junk all pending output
|
|
*/
|
|
CURVNET_SET(ifp->if_vnet);
|
|
|
|
l2tun = false;
|
|
if ((tp->tun_flags & TUN_L2) != 0) {
|
|
l2tun = true;
|
|
IF_DRAIN(&ifp->if_snd);
|
|
} else {
|
|
IFQ_PURGE(&ifp->if_snd);
|
|
}
|
|
|
|
/* For vmnet, we won't do most of the address/route bits */
|
|
if ((tp->tun_flags & TUN_VMNET) != 0 ||
|
|
(l2tun && (ifp->if_flags & IFF_LINK0) != 0))
|
|
goto out;
|
|
|
|
if (ifp->if_flags & IFF_UP) {
|
|
TUN_UNLOCK(tp);
|
|
if_down(ifp);
|
|
TUN_LOCK(tp);
|
|
}
|
|
|
|
/* Delete all addresses and routes which reference this interface. */
|
|
if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
|
|
struct ifaddr *ifa;
|
|
|
|
ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
|
|
TUN_UNLOCK(tp);
|
|
CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
|
|
/* deal w/IPv4 PtP destination; unlocked read */
|
|
if (!l2tun && ifa->ifa_addr->sa_family == AF_INET) {
|
|
rtinit(ifa, (int)RTM_DELETE,
|
|
tp->tun_flags & TUN_DSTADDR ? RTF_HOST : 0);
|
|
} else {
|
|
rtinit(ifa, (int)RTM_DELETE, 0);
|
|
}
|
|
}
|
|
if_purgeaddrs(ifp);
|
|
TUN_LOCK(tp);
|
|
}
|
|
|
|
out:
|
|
if_link_state_change(ifp, LINK_STATE_DOWN);
|
|
CURVNET_RESTORE();
|
|
|
|
funsetown(&tp->tun_sigio);
|
|
selwakeuppri(&tp->tun_rsel, PZERO + 1);
|
|
KNOTE_LOCKED(&tp->tun_rsel.si_note, 0);
|
|
TUNDEBUG (ifp, "closed\n");
|
|
tp->tun_flags &= ~TUN_OPEN;
|
|
tp->tun_pid = 0;
|
|
tun_vnethdr_set(ifp, 0);
|
|
|
|
tun_unbusy_locked(tp);
|
|
TUN_UNLOCK(tp);
|
|
}
|
|
|
|
static void
|
|
tuninit(struct ifnet *ifp)
|
|
{
|
|
struct tuntap_softc *tp = ifp->if_softc;
|
|
#ifdef INET
|
|
struct epoch_tracker et;
|
|
struct ifaddr *ifa;
|
|
#endif
|
|
|
|
TUNDEBUG(ifp, "tuninit\n");
|
|
|
|
TUN_LOCK(tp);
|
|
ifp->if_drv_flags |= IFF_DRV_RUNNING;
|
|
if ((tp->tun_flags & TUN_L2) == 0) {
|
|
ifp->if_flags |= IFF_UP;
|
|
getmicrotime(&ifp->if_lastchange);
|
|
#ifdef INET
|
|
NET_EPOCH_ENTER(et);
|
|
CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
|
|
if (ifa->ifa_addr->sa_family == AF_INET) {
|
|
struct sockaddr_in *si;
|
|
|
|
si = (struct sockaddr_in *)ifa->ifa_dstaddr;
|
|
if (si && si->sin_addr.s_addr) {
|
|
tp->tun_flags |= TUN_DSTADDR;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
NET_EPOCH_EXIT(et);
|
|
#endif
|
|
TUN_UNLOCK(tp);
|
|
} else {
|
|
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
|
|
TUN_UNLOCK(tp);
|
|
/* attempt to start output */
|
|
tunstart_l2(ifp);
|
|
}
|
|
|
|
}
|
|
|
|
/*
|
|
* Used only for l2 tunnel.
|
|
*/
|
|
static void
|
|
tunifinit(void *xtp)
|
|
{
|
|
struct tuntap_softc *tp;
|
|
|
|
tp = (struct tuntap_softc *)xtp;
|
|
tuninit(tp->tun_ifp);
|
|
}
|
|
|
|
/*
|
|
* To be called under TUN_LOCK. Update ifp->if_hwassist according to the
|
|
* current value of ifp->if_capenable.
|
|
*/
|
|
static void
|
|
tun_caps_changed(struct ifnet *ifp)
|
|
{
|
|
uint64_t hwassist = 0;
|
|
|
|
TUN_LOCK_ASSERT((struct tuntap_softc *)ifp->if_softc);
|
|
if (ifp->if_capenable & IFCAP_TXCSUM)
|
|
hwassist |= CSUM_TCP | CSUM_UDP;
|
|
if (ifp->if_capenable & IFCAP_TXCSUM_IPV6)
|
|
hwassist |= CSUM_TCP_IPV6
|
|
| CSUM_UDP_IPV6;
|
|
if (ifp->if_capenable & IFCAP_TSO4)
|
|
hwassist |= CSUM_IP_TSO;
|
|
if (ifp->if_capenable & IFCAP_TSO6)
|
|
hwassist |= CSUM_IP6_TSO;
|
|
ifp->if_hwassist = hwassist;
|
|
}
|
|
|
|
/*
|
|
* To be called under TUN_LOCK. Update tp->tun_vhdrlen and adjust
|
|
* if_capabilities and if_capenable as needed.
|
|
*/
|
|
static void
|
|
tun_vnethdr_set(struct ifnet *ifp, int vhdrlen)
|
|
{
|
|
struct tuntap_softc *tp = ifp->if_softc;
|
|
|
|
TUN_LOCK_ASSERT(tp);
|
|
|
|
if (tp->tun_vhdrlen == vhdrlen)
|
|
return;
|
|
|
|
/*
|
|
* Update if_capabilities to reflect the
|
|
* functionalities offered by the virtio-net
|
|
* header.
|
|
*/
|
|
if (vhdrlen != 0)
|
|
ifp->if_capabilities |=
|
|
TAP_VNET_HDR_CAPS;
|
|
else
|
|
ifp->if_capabilities &=
|
|
~TAP_VNET_HDR_CAPS;
|
|
/*
|
|
* Disable any capabilities that we don't
|
|
* support anymore.
|
|
*/
|
|
ifp->if_capenable &= ifp->if_capabilities;
|
|
tun_caps_changed(ifp);
|
|
tp->tun_vhdrlen = vhdrlen;
|
|
|
|
TUNDEBUG(ifp, "vnet_hdr_len=%d, if_capabilities=%x\n",
|
|
vhdrlen, ifp->if_capabilities);
|
|
}
|
|
|
|
/*
|
|
* Process an ioctl request.
|
|
*/
|
|
static int
|
|
tunifioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
|
|
{
|
|
struct ifreq *ifr = (struct ifreq *)data;
|
|
struct tuntap_softc *tp;
|
|
struct ifstat *ifs;
|
|
struct ifmediareq *ifmr;
|
|
int dummy, error = 0;
|
|
bool l2tun;
|
|
|
|
ifmr = NULL;
|
|
sx_xlock(&tun_ioctl_sx);
|
|
tp = ifp->if_softc;
|
|
if (tp == NULL) {
|
|
error = ENXIO;
|
|
goto bad;
|
|
}
|
|
l2tun = (tp->tun_flags & TUN_L2) != 0;
|
|
switch(cmd) {
|
|
case SIOCGIFSTATUS:
|
|
ifs = (struct ifstat *)data;
|
|
TUN_LOCK(tp);
|
|
if (tp->tun_pid)
|
|
snprintf(ifs->ascii, sizeof(ifs->ascii),
|
|
"\tOpened by PID %d\n", tp->tun_pid);
|
|
else
|
|
ifs->ascii[0] = '\0';
|
|
TUN_UNLOCK(tp);
|
|
break;
|
|
case SIOCSIFADDR:
|
|
if (l2tun)
|
|
error = ether_ioctl(ifp, cmd, data);
|
|
else
|
|
tuninit(ifp);
|
|
if (error == 0)
|
|
TUNDEBUG(ifp, "address set\n");
|
|
break;
|
|
case SIOCSIFMTU:
|
|
ifp->if_mtu = ifr->ifr_mtu;
|
|
TUNDEBUG(ifp, "mtu set\n");
|
|
break;
|
|
case SIOCSIFFLAGS:
|
|
case SIOCADDMULTI:
|
|
case SIOCDELMULTI:
|
|
break;
|
|
case SIOCGIFMEDIA:
|
|
if (!l2tun) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
ifmr = (struct ifmediareq *)data;
|
|
dummy = ifmr->ifm_count;
|
|
ifmr->ifm_count = 1;
|
|
ifmr->ifm_status = IFM_AVALID;
|
|
ifmr->ifm_active = IFM_ETHER;
|
|
if (tp->tun_flags & TUN_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 SIOCSIFCAP:
|
|
TUN_LOCK(tp);
|
|
ifp->if_capenable = ifr->ifr_reqcap;
|
|
tun_caps_changed(ifp);
|
|
TUN_UNLOCK(tp);
|
|
VLAN_CAPABILITIES(ifp);
|
|
break;
|
|
default:
|
|
if (l2tun) {
|
|
error = ether_ioctl(ifp, cmd, data);
|
|
} else {
|
|
error = EINVAL;
|
|
}
|
|
}
|
|
bad:
|
|
sx_xunlock(&tun_ioctl_sx);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* tunoutput - queue packets from higher level ready to put out.
|
|
*/
|
|
static int
|
|
tunoutput(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst,
|
|
struct route *ro)
|
|
{
|
|
struct tuntap_softc *tp = ifp->if_softc;
|
|
u_short cached_tun_flags;
|
|
int error;
|
|
u_int32_t af;
|
|
|
|
TUNDEBUG (ifp, "tunoutput\n");
|
|
|
|
#ifdef MAC
|
|
error = mac_ifnet_check_transmit(ifp, m0);
|
|
if (error) {
|
|
m_freem(m0);
|
|
return (error);
|
|
}
|
|
#endif
|
|
|
|
/* Could be unlocked read? */
|
|
TUN_LOCK(tp);
|
|
cached_tun_flags = tp->tun_flags;
|
|
TUN_UNLOCK(tp);
|
|
if ((cached_tun_flags & TUN_READY) != TUN_READY) {
|
|
TUNDEBUG (ifp, "not ready 0%o\n", tp->tun_flags);
|
|
m_freem (m0);
|
|
return (EHOSTDOWN);
|
|
}
|
|
|
|
if ((ifp->if_flags & IFF_UP) != IFF_UP) {
|
|
m_freem (m0);
|
|
return (EHOSTDOWN);
|
|
}
|
|
|
|
/* BPF writes need to be handled specially. */
|
|
if (dst->sa_family == AF_UNSPEC)
|
|
bcopy(dst->sa_data, &af, sizeof(af));
|
|
else
|
|
af = dst->sa_family;
|
|
|
|
if (bpf_peers_present(ifp->if_bpf))
|
|
bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m0);
|
|
|
|
/* prepend sockaddr? this may abort if the mbuf allocation fails */
|
|
if (cached_tun_flags & TUN_LMODE) {
|
|
/* allocate space for sockaddr */
|
|
M_PREPEND(m0, dst->sa_len, M_NOWAIT);
|
|
|
|
/* if allocation failed drop packet */
|
|
if (m0 == NULL) {
|
|
if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1);
|
|
if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
|
|
return (ENOBUFS);
|
|
} else {
|
|
bcopy(dst, m0->m_data, dst->sa_len);
|
|
}
|
|
}
|
|
|
|
if (cached_tun_flags & TUN_IFHEAD) {
|
|
/* Prepend the address family */
|
|
M_PREPEND(m0, 4, M_NOWAIT);
|
|
|
|
/* if allocation failed drop packet */
|
|
if (m0 == NULL) {
|
|
if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1);
|
|
if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
|
|
return (ENOBUFS);
|
|
} else
|
|
*(u_int32_t *)m0->m_data = htonl(af);
|
|
} else {
|
|
#ifdef INET
|
|
if (af != AF_INET)
|
|
#endif
|
|
{
|
|
m_freem(m0);
|
|
return (EAFNOSUPPORT);
|
|
}
|
|
}
|
|
|
|
error = (ifp->if_transmit)(ifp, m0);
|
|
if (error)
|
|
return (ENOBUFS);
|
|
if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* the cdevsw interface is now pretty minimal.
|
|
*/
|
|
static int
|
|
tunioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag,
|
|
struct thread *td)
|
|
{
|
|
struct ifreq ifr, *ifrp;
|
|
struct tuntap_softc *tp = dev->si_drv1;
|
|
struct ifnet *ifp = TUN2IFP(tp);
|
|
struct tuninfo *tunp;
|
|
int error, iflags, ival;
|
|
bool l2tun;
|
|
|
|
l2tun = (tp->tun_flags & TUN_L2) != 0;
|
|
if (l2tun) {
|
|
/* tap specific ioctls */
|
|
switch(cmd) {
|
|
/* 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 */
|
|
iflags = *(int *)data;
|
|
iflags &= TUN_VMIO_FLAG_MASK;
|
|
iflags &= ~IFF_CANTCHANGE;
|
|
iflags |= IFF_UP;
|
|
|
|
TUN_LOCK(tp);
|
|
ifp->if_flags = iflags |
|
|
(ifp->if_flags & IFF_CANTCHANGE);
|
|
TUN_UNLOCK(tp);
|
|
|
|
return (0);
|
|
case SIOCGIFADDR: /* get MAC address of the remote side */
|
|
TUN_LOCK(tp);
|
|
bcopy(&tp->tun_ether.octet, data,
|
|
sizeof(tp->tun_ether.octet));
|
|
TUN_UNLOCK(tp);
|
|
|
|
return (0);
|
|
case SIOCSIFADDR: /* set MAC address of the remote side */
|
|
TUN_LOCK(tp);
|
|
bcopy(data, &tp->tun_ether.octet,
|
|
sizeof(tp->tun_ether.octet));
|
|
TUN_UNLOCK(tp);
|
|
|
|
return (0);
|
|
case TAPSVNETHDR:
|
|
ival = *(int *)data;
|
|
if (ival != 0 &&
|
|
ival != sizeof(struct virtio_net_hdr) &&
|
|
ival != sizeof(struct virtio_net_hdr_mrg_rxbuf)) {
|
|
return (EINVAL);
|
|
}
|
|
TUN_LOCK(tp);
|
|
tun_vnethdr_set(ifp, ival);
|
|
TUN_UNLOCK(tp);
|
|
|
|
return (0);
|
|
case TAPGVNETHDR:
|
|
TUN_LOCK(tp);
|
|
*(int *)data = tp->tun_vhdrlen;
|
|
TUN_UNLOCK(tp);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* Fall through to the common ioctls if unhandled */
|
|
} else {
|
|
switch (cmd) {
|
|
case TUNSLMODE:
|
|
TUN_LOCK(tp);
|
|
if (*(int *)data) {
|
|
tp->tun_flags |= TUN_LMODE;
|
|
tp->tun_flags &= ~TUN_IFHEAD;
|
|
} else
|
|
tp->tun_flags &= ~TUN_LMODE;
|
|
TUN_UNLOCK(tp);
|
|
|
|
return (0);
|
|
case TUNSIFHEAD:
|
|
TUN_LOCK(tp);
|
|
if (*(int *)data) {
|
|
tp->tun_flags |= TUN_IFHEAD;
|
|
tp->tun_flags &= ~TUN_LMODE;
|
|
} else
|
|
tp->tun_flags &= ~TUN_IFHEAD;
|
|
TUN_UNLOCK(tp);
|
|
|
|
return (0);
|
|
case TUNGIFHEAD:
|
|
TUN_LOCK(tp);
|
|
*(int *)data = (tp->tun_flags & TUN_IFHEAD) ? 1 : 0;
|
|
TUN_UNLOCK(tp);
|
|
|
|
return (0);
|
|
case TUNSIFMODE:
|
|
/* deny this if UP */
|
|
if (TUN2IFP(tp)->if_flags & IFF_UP)
|
|
return (EBUSY);
|
|
|
|
switch (*(int *)data & ~IFF_MULTICAST) {
|
|
case IFF_POINTOPOINT:
|
|
case IFF_BROADCAST:
|
|
TUN_LOCK(tp);
|
|
TUN2IFP(tp)->if_flags &=
|
|
~(IFF_BROADCAST|IFF_POINTOPOINT|IFF_MULTICAST);
|
|
TUN2IFP(tp)->if_flags |= *(int *)data;
|
|
TUN_UNLOCK(tp);
|
|
|
|
break;
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
|
|
return (0);
|
|
case TUNSIFPID:
|
|
TUN_LOCK(tp);
|
|
tp->tun_pid = curthread->td_proc->p_pid;
|
|
TUN_UNLOCK(tp);
|
|
|
|
return (0);
|
|
}
|
|
/* Fall through to the common ioctls if unhandled */
|
|
}
|
|
|
|
switch (cmd) {
|
|
case TUNGIFNAME:
|
|
ifrp = (struct ifreq *)data;
|
|
strlcpy(ifrp->ifr_name, TUN2IFP(tp)->if_xname, IFNAMSIZ);
|
|
|
|
return (0);
|
|
case TUNSIFINFO:
|
|
tunp = (struct tuninfo *)data;
|
|
if (TUN2IFP(tp)->if_type != tunp->type)
|
|
return (EPROTOTYPE);
|
|
TUN_LOCK(tp);
|
|
if (TUN2IFP(tp)->if_mtu != tunp->mtu) {
|
|
strlcpy(ifr.ifr_name, if_name(TUN2IFP(tp)), IFNAMSIZ);
|
|
ifr.ifr_mtu = tunp->mtu;
|
|
CURVNET_SET(TUN2IFP(tp)->if_vnet);
|
|
error = ifhwioctl(SIOCSIFMTU, TUN2IFP(tp),
|
|
(caddr_t)&ifr, td);
|
|
CURVNET_RESTORE();
|
|
if (error) {
|
|
TUN_UNLOCK(tp);
|
|
return (error);
|
|
}
|
|
}
|
|
TUN2IFP(tp)->if_baudrate = tunp->baudrate;
|
|
TUN_UNLOCK(tp);
|
|
break;
|
|
case TUNGIFINFO:
|
|
tunp = (struct tuninfo *)data;
|
|
TUN_LOCK(tp);
|
|
tunp->mtu = TUN2IFP(tp)->if_mtu;
|
|
tunp->type = TUN2IFP(tp)->if_type;
|
|
tunp->baudrate = TUN2IFP(tp)->if_baudrate;
|
|
TUN_UNLOCK(tp);
|
|
break;
|
|
case TUNSDEBUG:
|
|
tundebug = *(int *)data;
|
|
break;
|
|
case TUNGDEBUG:
|
|
*(int *)data = tundebug;
|
|
break;
|
|
case FIONBIO:
|
|
break;
|
|
case FIOASYNC:
|
|
TUN_LOCK(tp);
|
|
if (*(int *)data)
|
|
tp->tun_flags |= TUN_ASYNC;
|
|
else
|
|
tp->tun_flags &= ~TUN_ASYNC;
|
|
TUN_UNLOCK(tp);
|
|
break;
|
|
case FIONREAD:
|
|
if (!IFQ_IS_EMPTY(&TUN2IFP(tp)->if_snd)) {
|
|
struct mbuf *mb;
|
|
IFQ_LOCK(&TUN2IFP(tp)->if_snd);
|
|
IFQ_POLL_NOLOCK(&TUN2IFP(tp)->if_snd, mb);
|
|
for (*(int *)data = 0; mb != NULL; mb = mb->m_next)
|
|
*(int *)data += mb->m_len;
|
|
IFQ_UNLOCK(&TUN2IFP(tp)->if_snd);
|
|
} else
|
|
*(int *)data = 0;
|
|
break;
|
|
case FIOSETOWN:
|
|
return (fsetown(*(int *)data, &tp->tun_sigio));
|
|
|
|
case FIOGETOWN:
|
|
*(int *)data = fgetown(&tp->tun_sigio);
|
|
return (0);
|
|
|
|
/* This is deprecated, FIOSETOWN should be used instead. */
|
|
case TIOCSPGRP:
|
|
return (fsetown(-(*(int *)data), &tp->tun_sigio));
|
|
|
|
/* This is deprecated, FIOGETOWN should be used instead. */
|
|
case TIOCGPGRP:
|
|
*(int *)data = -fgetown(&tp->tun_sigio);
|
|
return (0);
|
|
|
|
default:
|
|
return (ENOTTY);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* The cdevsw read interface - reads a packet at a time, or at
|
|
* least as much of a packet as can be read.
|
|
*/
|
|
static int
|
|
tunread(struct cdev *dev, struct uio *uio, int flag)
|
|
{
|
|
struct tuntap_softc *tp = dev->si_drv1;
|
|
struct ifnet *ifp = TUN2IFP(tp);
|
|
struct mbuf *m;
|
|
size_t len;
|
|
int error = 0;
|
|
|
|
TUNDEBUG (ifp, "read\n");
|
|
TUN_LOCK(tp);
|
|
if ((tp->tun_flags & TUN_READY) != TUN_READY) {
|
|
TUN_UNLOCK(tp);
|
|
TUNDEBUG (ifp, "not ready 0%o\n", tp->tun_flags);
|
|
return (EHOSTDOWN);
|
|
}
|
|
|
|
tp->tun_flags &= ~TUN_RWAIT;
|
|
|
|
for (;;) {
|
|
IFQ_DEQUEUE(&ifp->if_snd, m);
|
|
if (m != NULL)
|
|
break;
|
|
if (flag & O_NONBLOCK) {
|
|
TUN_UNLOCK(tp);
|
|
return (EWOULDBLOCK);
|
|
}
|
|
tp->tun_flags |= TUN_RWAIT;
|
|
error = mtx_sleep(tp, &tp->tun_mtx, PCATCH | (PZERO + 1),
|
|
"tunread", 0);
|
|
if (error != 0) {
|
|
TUN_UNLOCK(tp);
|
|
return (error);
|
|
}
|
|
}
|
|
TUN_UNLOCK(tp);
|
|
|
|
if ((tp->tun_flags & TUN_L2) != 0)
|
|
BPF_MTAP(ifp, m);
|
|
|
|
len = min(tp->tun_vhdrlen, uio->uio_resid);
|
|
if (len > 0) {
|
|
struct virtio_net_hdr_mrg_rxbuf vhdr;
|
|
|
|
bzero(&vhdr, sizeof(vhdr));
|
|
if (m->m_pkthdr.csum_flags & TAP_ALL_OFFLOAD) {
|
|
m = virtio_net_tx_offload(ifp, m, false, &vhdr.hdr);
|
|
}
|
|
|
|
TUNDEBUG(ifp, "txvhdr: f %u, gt %u, hl %u, "
|
|
"gs %u, cs %u, co %u\n", vhdr.hdr.flags,
|
|
vhdr.hdr.gso_type, vhdr.hdr.hdr_len,
|
|
vhdr.hdr.gso_size, vhdr.hdr.csum_start,
|
|
vhdr.hdr.csum_offset);
|
|
error = uiomove(&vhdr, len, uio);
|
|
}
|
|
|
|
while (m && uio->uio_resid > 0 && error == 0) {
|
|
len = min(uio->uio_resid, m->m_len);
|
|
if (len != 0)
|
|
error = uiomove(mtod(m, void *), len, uio);
|
|
m = m_free(m);
|
|
}
|
|
|
|
if (m) {
|
|
TUNDEBUG(ifp, "Dropping mbuf\n");
|
|
m_freem(m);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
tunwrite_l2(struct tuntap_softc *tp, struct mbuf *m,
|
|
struct virtio_net_hdr_mrg_rxbuf *vhdr)
|
|
{
|
|
struct ether_header *eh;
|
|
struct ifnet *ifp;
|
|
|
|
ifp = TUN2IFP(tp);
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
if (vhdr != NULL && virtio_net_rx_csum(m, &vhdr->hdr)) {
|
|
m_freem(m);
|
|
return (0);
|
|
}
|
|
|
|
/* Pass packet up to parent. */
|
|
CURVNET_SET(ifp->if_vnet);
|
|
(*ifp->if_input)(ifp, m);
|
|
CURVNET_RESTORE();
|
|
/* ibytes are counted in parent */
|
|
if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
tunwrite_l3(struct tuntap_softc *tp, struct mbuf *m)
|
|
{
|
|
struct epoch_tracker et;
|
|
struct ifnet *ifp;
|
|
int family, isr;
|
|
|
|
ifp = TUN2IFP(tp);
|
|
/* Could be unlocked read? */
|
|
TUN_LOCK(tp);
|
|
if (tp->tun_flags & TUN_IFHEAD) {
|
|
TUN_UNLOCK(tp);
|
|
if (m->m_len < sizeof(family) &&
|
|
(m = m_pullup(m, sizeof(family))) == NULL)
|
|
return (ENOBUFS);
|
|
family = ntohl(*mtod(m, u_int32_t *));
|
|
m_adj(m, sizeof(family));
|
|
} else {
|
|
TUN_UNLOCK(tp);
|
|
family = AF_INET;
|
|
}
|
|
|
|
BPF_MTAP2(ifp, &family, sizeof(family), m);
|
|
|
|
switch (family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
isr = NETISR_IP;
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
isr = NETISR_IPV6;
|
|
break;
|
|
#endif
|
|
default:
|
|
m_freem(m);
|
|
return (EAFNOSUPPORT);
|
|
}
|
|
random_harvest_queue(m, sizeof(*m), RANDOM_NET_TUN);
|
|
if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
|
|
if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
|
|
CURVNET_SET(ifp->if_vnet);
|
|
M_SETFIB(m, ifp->if_fib);
|
|
NET_EPOCH_ENTER(et);
|
|
netisr_dispatch(isr, m);
|
|
NET_EPOCH_EXIT(et);
|
|
CURVNET_RESTORE();
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* the cdevsw write interface - an atomic write is a packet - or else!
|
|
*/
|
|
static int
|
|
tunwrite(struct cdev *dev, struct uio *uio, int flag)
|
|
{
|
|
struct virtio_net_hdr_mrg_rxbuf vhdr;
|
|
struct tuntap_softc *tp;
|
|
struct ifnet *ifp;
|
|
struct mbuf *m;
|
|
uint32_t mru;
|
|
int align, vhdrlen, error;
|
|
bool l2tun;
|
|
|
|
tp = dev->si_drv1;
|
|
ifp = TUN2IFP(tp);
|
|
TUNDEBUG(ifp, "tunwrite\n");
|
|
if ((ifp->if_flags & IFF_UP) != IFF_UP)
|
|
/* ignore silently */
|
|
return (0);
|
|
|
|
if (uio->uio_resid == 0)
|
|
return (0);
|
|
|
|
l2tun = (tp->tun_flags & TUN_L2) != 0;
|
|
mru = l2tun ? TAPMRU : TUNMRU;
|
|
vhdrlen = tp->tun_vhdrlen;
|
|
align = 0;
|
|
if (l2tun) {
|
|
align = ETHER_ALIGN;
|
|
mru += vhdrlen;
|
|
} else if ((tp->tun_flags & TUN_IFHEAD) != 0)
|
|
mru += sizeof(uint32_t); /* family */
|
|
if (uio->uio_resid < 0 || uio->uio_resid > mru) {
|
|
TUNDEBUG(ifp, "len=%zd!\n", uio->uio_resid);
|
|
return (EIO);
|
|
}
|
|
|
|
if (vhdrlen > 0) {
|
|
error = uiomove(&vhdr, vhdrlen, uio);
|
|
if (error != 0)
|
|
return (error);
|
|
TUNDEBUG(ifp, "txvhdr: f %u, gt %u, hl %u, "
|
|
"gs %u, cs %u, co %u\n", vhdr.hdr.flags,
|
|
vhdr.hdr.gso_type, vhdr.hdr.hdr_len,
|
|
vhdr.hdr.gso_size, vhdr.hdr.csum_start,
|
|
vhdr.hdr.csum_offset);
|
|
}
|
|
|
|
if ((m = m_uiotombuf(uio, M_NOWAIT, 0, align, M_PKTHDR)) == NULL) {
|
|
if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
|
|
return (ENOBUFS);
|
|
}
|
|
|
|
m->m_pkthdr.rcvif = ifp;
|
|
#ifdef MAC
|
|
mac_ifnet_create_mbuf(ifp, m);
|
|
#endif
|
|
|
|
if (l2tun)
|
|
return (tunwrite_l2(tp, m, vhdrlen > 0 ? &vhdr : NULL));
|
|
|
|
return (tunwrite_l3(tp, m));
|
|
}
|
|
|
|
/*
|
|
* tunpoll - 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
|
|
tunpoll(struct cdev *dev, int events, struct thread *td)
|
|
{
|
|
struct tuntap_softc *tp = dev->si_drv1;
|
|
struct ifnet *ifp = TUN2IFP(tp);
|
|
int revents = 0;
|
|
|
|
TUNDEBUG(ifp, "tunpoll\n");
|
|
|
|
if (events & (POLLIN | POLLRDNORM)) {
|
|
IFQ_LOCK(&ifp->if_snd);
|
|
if (!IFQ_IS_EMPTY(&ifp->if_snd)) {
|
|
TUNDEBUG(ifp, "tunpoll q=%d\n", ifp->if_snd.ifq_len);
|
|
revents |= events & (POLLIN | POLLRDNORM);
|
|
} else {
|
|
TUNDEBUG(ifp, "tunpoll waiting\n");
|
|
selrecord(td, &tp->tun_rsel);
|
|
}
|
|
IFQ_UNLOCK(&ifp->if_snd);
|
|
}
|
|
revents |= events & (POLLOUT | POLLWRNORM);
|
|
|
|
return (revents);
|
|
}
|
|
|
|
/*
|
|
* tunkqfilter - support for the kevent() system call.
|
|
*/
|
|
static int
|
|
tunkqfilter(struct cdev *dev, struct knote *kn)
|
|
{
|
|
struct tuntap_softc *tp = dev->si_drv1;
|
|
struct ifnet *ifp = TUN2IFP(tp);
|
|
|
|
switch(kn->kn_filter) {
|
|
case EVFILT_READ:
|
|
TUNDEBUG(ifp, "%s kqfilter: EVFILT_READ, minor = %#x\n",
|
|
ifp->if_xname, dev2unit(dev));
|
|
kn->kn_fop = &tun_read_filterops;
|
|
break;
|
|
|
|
case EVFILT_WRITE:
|
|
TUNDEBUG(ifp, "%s kqfilter: EVFILT_WRITE, minor = %#x\n",
|
|
ifp->if_xname, dev2unit(dev));
|
|
kn->kn_fop = &tun_write_filterops;
|
|
break;
|
|
|
|
default:
|
|
TUNDEBUG(ifp, "%s kqfilter: invalid filter, minor = %#x\n",
|
|
ifp->if_xname, dev2unit(dev));
|
|
return(EINVAL);
|
|
}
|
|
|
|
kn->kn_hook = tp;
|
|
knlist_add(&tp->tun_rsel.si_note, kn, 0);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Return true of there is data in the interface queue.
|
|
*/
|
|
static int
|
|
tunkqread(struct knote *kn, long hint)
|
|
{
|
|
int ret;
|
|
struct tuntap_softc *tp = kn->kn_hook;
|
|
struct cdev *dev = tp->tun_dev;
|
|
struct ifnet *ifp = TUN2IFP(tp);
|
|
|
|
if ((kn->kn_data = ifp->if_snd.ifq_len) > 0) {
|
|
TUNDEBUG(ifp,
|
|
"%s have data in the queue. Len = %d, minor = %#x\n",
|
|
ifp->if_xname, ifp->if_snd.ifq_len, dev2unit(dev));
|
|
ret = 1;
|
|
} else {
|
|
TUNDEBUG(ifp,
|
|
"%s waiting for data, minor = %#x\n", ifp->if_xname,
|
|
dev2unit(dev));
|
|
ret = 0;
|
|
}
|
|
|
|
return (ret);
|
|
}
|
|
|
|
/*
|
|
* Always can write, always return MTU in kn->data.
|
|
*/
|
|
static int
|
|
tunkqwrite(struct knote *kn, long hint)
|
|
{
|
|
struct tuntap_softc *tp = kn->kn_hook;
|
|
struct ifnet *ifp = TUN2IFP(tp);
|
|
|
|
kn->kn_data = ifp->if_mtu;
|
|
|
|
return (1);
|
|
}
|
|
|
|
static void
|
|
tunkqdetach(struct knote *kn)
|
|
{
|
|
struct tuntap_softc *tp = kn->kn_hook;
|
|
|
|
knlist_remove(&tp->tun_rsel.si_note, kn, 0);
|
|
}
|