1117 lines
22 KiB
C
1117 lines
22 KiB
C
/* $NetBSD: if_tun.c,v 1.113 2010/04/05 07:22:24 joerg Exp $ */
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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 its
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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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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: if_tun.c,v 1.113 2010/04/05 07:22:24 joerg Exp $");
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#include "opt_inet.h"
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/buf.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <sys/errno.h>
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#include <sys/syslog.h>
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#include <sys/select.h>
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#include <sys/poll.h>
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#include <sys/file.h>
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#include <sys/signalvar.h>
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#include <sys/conf.h>
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#include <sys/kauth.h>
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#include <sys/simplelock.h>
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#include <sys/cpu.h>
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#include <net/if.h>
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#include <net/if_types.h>
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#include <net/netisr.h>
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#include <net/route.h>
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#ifdef INET
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/in_var.h>
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#include <netinet/ip.h>
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#include <netinet/if_inarp.h>
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#endif
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#include <sys/time.h>
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#include <net/bpf.h>
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#include <net/if_tun.h>
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#define TUNDEBUG if (tundebug) printf
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int tundebug = 0;
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extern int ifqmaxlen;
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void tunattach(int);
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static LIST_HEAD(, tun_softc) tun_softc_list;
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static LIST_HEAD(, tun_softc) tunz_softc_list;
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static struct simplelock tun_softc_lock;
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static int tun_ioctl(struct ifnet *, u_long, void *);
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static int tun_output(struct ifnet *, struct mbuf *,
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const struct sockaddr *, struct rtentry *rt);
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static int tun_clone_create(struct if_clone *, int);
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static int tun_clone_destroy(struct ifnet *);
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static struct if_clone tun_cloner =
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IF_CLONE_INITIALIZER("tun", tun_clone_create, tun_clone_destroy);
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static void tunattach0(struct tun_softc *);
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static void tuninit(struct tun_softc *);
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static void tun_i_softintr(void *);
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static void tun_o_softintr(void *);
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#ifdef ALTQ
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static void tunstart(struct ifnet *);
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#endif
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static struct tun_softc *tun_find_unit(dev_t);
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static struct tun_softc *tun_find_zunit(int);
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static dev_type_open(tunopen);
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static dev_type_close(tunclose);
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static dev_type_read(tunread);
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static dev_type_write(tunwrite);
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static dev_type_ioctl(tunioctl);
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static dev_type_poll(tunpoll);
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static dev_type_kqfilter(tunkqfilter);
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const struct cdevsw tun_cdevsw = {
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tunopen, tunclose, tunread, tunwrite, tunioctl,
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nostop, notty, tunpoll, nommap, tunkqfilter, D_OTHER,
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};
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void
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tunattach(int unused)
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{
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simple_lock_init(&tun_softc_lock);
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LIST_INIT(&tun_softc_list);
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LIST_INIT(&tunz_softc_list);
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if_clone_attach(&tun_cloner);
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}
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/*
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* Find driver instance from dev_t.
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* Call at splnet().
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* Returns with tp locked (if found).
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*/
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static struct tun_softc *
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tun_find_unit(dev_t dev)
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{
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struct tun_softc *tp;
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int unit = minor(dev);
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simple_lock(&tun_softc_lock);
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LIST_FOREACH(tp, &tun_softc_list, tun_list)
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if (unit == tp->tun_unit)
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break;
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if (tp)
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simple_lock(&tp->tun_lock);
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simple_unlock(&tun_softc_lock);
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return (tp);
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}
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/*
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* Find zombie driver instance by unit number.
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* Call at splnet().
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* Remove tp from list and return it unlocked (if found).
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*/
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static struct tun_softc *
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tun_find_zunit(int unit)
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{
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struct tun_softc *tp;
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simple_lock(&tun_softc_lock);
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LIST_FOREACH(tp, &tunz_softc_list, tun_list)
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if (unit == tp->tun_unit)
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break;
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if (tp)
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LIST_REMOVE(tp, tun_list);
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simple_unlock(&tun_softc_lock);
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#ifdef DIAGNOSTIC
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if (tp != NULL && (tp->tun_flags & (TUN_INITED|TUN_OPEN)) != TUN_OPEN)
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printf("tun%d: inconsistent flags: %x\n", unit, tp->tun_flags);
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#endif
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return (tp);
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}
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static int
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tun_clone_create(struct if_clone *ifc, int unit)
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{
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struct tun_softc *tp;
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if ((tp = tun_find_zunit(unit)) == NULL) {
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/* Allocate a new instance */
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tp = malloc(sizeof(*tp), M_DEVBUF, M_WAITOK|M_ZERO);
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tp->tun_unit = unit;
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simple_lock_init(&tp->tun_lock);
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selinit(&tp->tun_rsel);
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selinit(&tp->tun_wsel);
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} else {
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/* Revive tunnel instance; clear ifp part */
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(void)memset(&tp->tun_if, 0, sizeof(struct ifnet));
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}
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if_initname(&tp->tun_if, ifc->ifc_name, unit);
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tunattach0(tp);
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tp->tun_flags |= TUN_INITED;
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tp->tun_osih = softint_establish(SOFTINT_CLOCK, tun_o_softintr, tp);
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tp->tun_isih = softint_establish(SOFTINT_CLOCK, tun_i_softintr, tp);
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simple_lock(&tun_softc_lock);
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LIST_INSERT_HEAD(&tun_softc_list, tp, tun_list);
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simple_unlock(&tun_softc_lock);
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return (0);
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}
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static void
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tunattach0(struct tun_softc *tp)
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{
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struct ifnet *ifp;
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ifp = &tp->tun_if;
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ifp->if_softc = tp;
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ifp->if_mtu = TUNMTU;
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ifp->if_ioctl = tun_ioctl;
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ifp->if_output = tun_output;
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#ifdef ALTQ
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ifp->if_start = tunstart;
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#endif
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ifp->if_flags = IFF_POINTOPOINT;
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ifp->if_type = IFT_TUNNEL;
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ifp->if_snd.ifq_maxlen = ifqmaxlen;
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ifp->if_collisions = 0;
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ifp->if_ierrors = 0;
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ifp->if_oerrors = 0;
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ifp->if_ipackets = 0;
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ifp->if_opackets = 0;
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ifp->if_ibytes = 0;
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ifp->if_obytes = 0;
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ifp->if_dlt = DLT_NULL;
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IFQ_SET_READY(&ifp->if_snd);
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if_attach(ifp);
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if_alloc_sadl(ifp);
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bpf_attach(ifp, DLT_NULL, sizeof(uint32_t));
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}
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static int
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tun_clone_destroy(struct ifnet *ifp)
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{
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struct tun_softc *tp = (void *)ifp;
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int s, zombie = 0;
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s = splnet();
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simple_lock(&tun_softc_lock);
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simple_lock(&tp->tun_lock);
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LIST_REMOVE(tp, tun_list);
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if (tp->tun_flags & TUN_OPEN) {
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/* Hang on to storage until last close */
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zombie = 1;
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tp->tun_flags &= ~TUN_INITED;
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LIST_INSERT_HEAD(&tunz_softc_list, tp, tun_list);
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}
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simple_unlock(&tun_softc_lock);
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IF_PURGE(&ifp->if_snd);
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ifp->if_flags &= ~IFF_RUNNING;
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if (tp->tun_flags & TUN_RWAIT) {
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tp->tun_flags &= ~TUN_RWAIT;
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wakeup((void *)tp);
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}
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selnotify(&tp->tun_rsel, 0, 0);
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simple_unlock(&tp->tun_lock);
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splx(s);
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if (tp->tun_flags & TUN_ASYNC && tp->tun_pgid)
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fownsignal(tp->tun_pgid, SIGIO, POLL_HUP, 0, NULL);
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bpf_detach(ifp);
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if_detach(ifp);
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if (!zombie) {
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seldestroy(&tp->tun_rsel);
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seldestroy(&tp->tun_wsel);
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softint_disestablish(tp->tun_osih);
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softint_disestablish(tp->tun_isih);
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free(tp, M_DEVBUF);
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}
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return (0);
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}
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/*
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* tunnel open - must be superuser & the device must be
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* configured in
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*/
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static int
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tunopen(dev_t dev, int flag, int mode, struct lwp *l)
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{
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struct ifnet *ifp;
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struct tun_softc *tp;
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int s, error;
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error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE_TUN,
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KAUTH_REQ_NETWORK_INTERFACE_TUN_ADD, NULL, NULL, NULL);
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if (error)
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return (error);
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s = splnet();
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tp = tun_find_unit(dev);
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if (tp == NULL) {
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(void)tun_clone_create(&tun_cloner, minor(dev));
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tp = tun_find_unit(dev);
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if (tp == NULL) {
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error = ENXIO;
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goto out_nolock;
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}
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}
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if (tp->tun_flags & TUN_OPEN) {
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error = EBUSY;
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goto out;
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}
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ifp = &tp->tun_if;
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tp->tun_flags |= TUN_OPEN;
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TUNDEBUG("%s: open\n", ifp->if_xname);
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out:
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simple_unlock(&tp->tun_lock);
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out_nolock:
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splx(s);
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return (error);
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}
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/*
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* tunclose - close the device - mark i/f down & delete
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* routing info
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*/
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int
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tunclose(dev_t dev, int flag, int mode,
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struct lwp *l)
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{
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int s;
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struct tun_softc *tp;
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struct ifnet *ifp;
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s = splnet();
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if ((tp = tun_find_zunit(minor(dev))) != NULL) {
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/* interface was "destroyed" before the close */
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seldestroy(&tp->tun_rsel);
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seldestroy(&tp->tun_wsel);
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softint_disestablish(tp->tun_osih);
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softint_disestablish(tp->tun_isih);
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free(tp, M_DEVBUF);
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goto out_nolock;
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}
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if ((tp = tun_find_unit(dev)) == NULL)
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goto out_nolock;
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ifp = &tp->tun_if;
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tp->tun_flags &= ~TUN_OPEN;
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/*
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* junk all pending output
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*/
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IFQ_PURGE(&ifp->if_snd);
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if (ifp->if_flags & IFF_UP) {
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if_down(ifp);
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if (ifp->if_flags & IFF_RUNNING) {
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/* find internet addresses and delete routes */
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struct ifaddr *ifa;
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IFADDR_FOREACH(ifa, ifp) {
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#if defined(INET) || defined(INET6)
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if (ifa->ifa_addr->sa_family == AF_INET ||
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ifa->ifa_addr->sa_family == AF_INET6) {
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rtinit(ifa, (int)RTM_DELETE,
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tp->tun_flags & TUN_DSTADDR
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? RTF_HOST
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: 0);
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}
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#endif
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}
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}
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}
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tp->tun_pgid = 0;
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selnotify(&tp->tun_rsel, 0, 0);
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TUNDEBUG ("%s: closed\n", ifp->if_xname);
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simple_unlock(&tp->tun_lock);
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out_nolock:
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splx(s);
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return (0);
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}
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/*
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* Call at splnet().
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*/
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static void
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tuninit(struct tun_softc *tp)
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{
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struct ifnet *ifp = &tp->tun_if;
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struct ifaddr *ifa;
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TUNDEBUG("%s: tuninit\n", ifp->if_xname);
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simple_lock(&tp->tun_lock);
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ifp->if_flags |= IFF_UP | IFF_RUNNING;
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tp->tun_flags &= ~(TUN_IASET|TUN_DSTADDR);
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IFADDR_FOREACH(ifa, ifp) {
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#ifdef INET
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if (ifa->ifa_addr->sa_family == AF_INET) {
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struct sockaddr_in *sin;
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sin = satosin(ifa->ifa_addr);
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if (sin && sin->sin_addr.s_addr)
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tp->tun_flags |= TUN_IASET;
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if (ifp->if_flags & IFF_POINTOPOINT) {
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sin = satosin(ifa->ifa_dstaddr);
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if (sin && sin->sin_addr.s_addr)
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tp->tun_flags |= TUN_DSTADDR;
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}
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}
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#endif
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#ifdef INET6
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if (ifa->ifa_addr->sa_family == AF_INET6) {
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struct sockaddr_in6 *sin;
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sin = (struct sockaddr_in6 *)ifa->ifa_addr;
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if (!IN6_IS_ADDR_UNSPECIFIED(&sin->sin6_addr))
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tp->tun_flags |= TUN_IASET;
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if (ifp->if_flags & IFF_POINTOPOINT) {
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sin = (struct sockaddr_in6 *)ifa->ifa_dstaddr;
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if (sin &&
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!IN6_IS_ADDR_UNSPECIFIED(&sin->sin6_addr))
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tp->tun_flags |= TUN_DSTADDR;
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} else
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tp->tun_flags &= ~TUN_DSTADDR;
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}
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#endif /* INET6 */
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}
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simple_unlock(&tp->tun_lock);
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return;
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}
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|
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/*
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* Process an ioctl request.
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*/
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static int
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tun_ioctl(struct ifnet *ifp, u_long cmd, void *data)
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{
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int error = 0, s;
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struct tun_softc *tp = (struct tun_softc *)(ifp->if_softc);
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struct ifreq *ifr = data;
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s = splnet();
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|
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switch (cmd) {
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case SIOCINITIFADDR:
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tuninit(tp);
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TUNDEBUG("%s: address set\n", ifp->if_xname);
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break;
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case SIOCSIFDSTADDR:
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tuninit(tp);
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TUNDEBUG("%s: destination address set\n", ifp->if_xname);
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break;
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case SIOCSIFBRDADDR:
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TUNDEBUG("%s: broadcast address set\n", ifp->if_xname);
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break;
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case SIOCSIFMTU:
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if (ifr->ifr_mtu > TUNMTU || ifr->ifr_mtu < 576) {
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error = EINVAL;
|
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break;
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}
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TUNDEBUG("%s: interface mtu set\n", ifp->if_xname);
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if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET)
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error = 0;
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break;
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case SIOCADDMULTI:
|
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case SIOCDELMULTI:
|
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if (ifr == NULL) {
|
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error = EAFNOSUPPORT; /* XXX */
|
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break;
|
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}
|
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switch (ifreq_getaddr(cmd, ifr)->sa_family) {
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#ifdef INET
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case AF_INET:
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break;
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#endif
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#ifdef INET6
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case AF_INET6:
|
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break;
|
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#endif
|
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default:
|
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error = EAFNOSUPPORT;
|
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break;
|
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}
|
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break;
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default:
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error = ifioctl_common(ifp, cmd, data);
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}
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|
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splx(s);
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return (error);
|
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}
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|
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/*
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* tun_output - queue packets from higher level ready to put out.
|
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*/
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static int
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tun_output(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst,
|
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struct rtentry *rt)
|
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{
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struct tun_softc *tp = ifp->if_softc;
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int s;
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int error;
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#if defined(INET) || defined(INET6)
|
|
int mlen;
|
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uint32_t *af;
|
|
#endif
|
|
ALTQ_DECL(struct altq_pktattr pktattr;)
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|
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s = splnet();
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simple_lock(&tp->tun_lock);
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TUNDEBUG ("%s: tun_output\n", ifp->if_xname);
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|
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if ((tp->tun_flags & TUN_READY) != TUN_READY) {
|
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TUNDEBUG ("%s: not ready 0%o\n", ifp->if_xname,
|
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tp->tun_flags);
|
|
m_freem (m0);
|
|
error = EHOSTDOWN;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* if the queueing discipline needs packet classification,
|
|
* do it before prepending link headers.
|
|
*/
|
|
IFQ_CLASSIFY(&ifp->if_snd, m0, dst->sa_family, &pktattr);
|
|
|
|
bpf_mtap_af(ifp, dst->sa_family, m0);
|
|
|
|
switch(dst->sa_family) {
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
#endif
|
|
#ifdef INET
|
|
case AF_INET:
|
|
#endif
|
|
#if defined(INET) || defined(INET6)
|
|
if (tp->tun_flags & TUN_PREPADDR) {
|
|
/* Simple link-layer header */
|
|
M_PREPEND(m0, dst->sa_len, M_DONTWAIT);
|
|
if (m0 == NULL) {
|
|
IF_DROP(&ifp->if_snd);
|
|
error = ENOBUFS;
|
|
goto out;
|
|
}
|
|
bcopy(dst, mtod(m0, char *), dst->sa_len);
|
|
}
|
|
|
|
if (tp->tun_flags & TUN_IFHEAD) {
|
|
/* Prepend the address family */
|
|
M_PREPEND(m0, sizeof(*af), M_DONTWAIT);
|
|
if (m0 == NULL) {
|
|
IF_DROP(&ifp->if_snd);
|
|
error = ENOBUFS;
|
|
goto out;
|
|
}
|
|
af = mtod(m0,uint32_t *);
|
|
*af = htonl(dst->sa_family);
|
|
} else {
|
|
#ifdef INET
|
|
if (dst->sa_family != AF_INET)
|
|
#endif
|
|
{
|
|
m_freem(m0);
|
|
error = EAFNOSUPPORT;
|
|
goto out;
|
|
}
|
|
}
|
|
/* FALLTHROUGH */
|
|
case AF_UNSPEC:
|
|
IFQ_ENQUEUE(&ifp->if_snd, m0, &pktattr, error);
|
|
if (error) {
|
|
ifp->if_collisions++;
|
|
error = EAFNOSUPPORT;
|
|
goto out;
|
|
}
|
|
mlen = m0->m_pkthdr.len;
|
|
ifp->if_opackets++;
|
|
ifp->if_obytes += mlen;
|
|
break;
|
|
#endif
|
|
default:
|
|
m_freem(m0);
|
|
error = EAFNOSUPPORT;
|
|
goto out;
|
|
}
|
|
|
|
if (tp->tun_flags & TUN_RWAIT) {
|
|
tp->tun_flags &= ~TUN_RWAIT;
|
|
wakeup((void *)tp);
|
|
}
|
|
if (tp->tun_flags & TUN_ASYNC && tp->tun_pgid)
|
|
softint_schedule(tp->tun_isih);
|
|
|
|
selnotify(&tp->tun_rsel, 0, 0);
|
|
out:
|
|
simple_unlock(&tp->tun_lock);
|
|
splx(s);
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
tun_i_softintr(void *cookie)
|
|
{
|
|
struct tun_softc *tp = cookie;
|
|
|
|
if (tp->tun_flags & TUN_ASYNC && tp->tun_pgid)
|
|
fownsignal(tp->tun_pgid, SIGIO, POLL_IN, POLLIN|POLLRDNORM,
|
|
NULL);
|
|
}
|
|
|
|
static void
|
|
tun_o_softintr(void *cookie)
|
|
{
|
|
struct tun_softc *tp = cookie;
|
|
|
|
if (tp->tun_flags & TUN_ASYNC && tp->tun_pgid)
|
|
fownsignal(tp->tun_pgid, SIGIO, POLL_OUT, POLLOUT|POLLWRNORM,
|
|
NULL);
|
|
}
|
|
|
|
/*
|
|
* the cdevsw interface is now pretty minimal.
|
|
*/
|
|
int
|
|
tunioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
|
|
{
|
|
struct tun_softc *tp;
|
|
int s, error = 0;
|
|
|
|
s = splnet();
|
|
tp = tun_find_unit(dev);
|
|
|
|
/* interface was "destroyed" already */
|
|
if (tp == NULL) {
|
|
error = ENXIO;
|
|
goto out_nolock;
|
|
}
|
|
|
|
switch (cmd) {
|
|
case TUNSDEBUG:
|
|
tundebug = *(int *)data;
|
|
break;
|
|
|
|
case TUNGDEBUG:
|
|
*(int *)data = tundebug;
|
|
break;
|
|
|
|
case TUNSIFMODE:
|
|
switch (*(int *)data & (IFF_POINTOPOINT|IFF_BROADCAST)) {
|
|
case IFF_POINTOPOINT:
|
|
case IFF_BROADCAST:
|
|
if (tp->tun_if.if_flags & IFF_UP) {
|
|
error = EBUSY;
|
|
goto out;
|
|
}
|
|
tp->tun_if.if_flags &=
|
|
~(IFF_BROADCAST|IFF_POINTOPOINT|IFF_MULTICAST);
|
|
tp->tun_if.if_flags |= *(int *)data;
|
|
break;
|
|
default:
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
break;
|
|
|
|
case TUNSLMODE:
|
|
if (*(int *)data) {
|
|
tp->tun_flags |= TUN_PREPADDR;
|
|
tp->tun_flags &= ~TUN_IFHEAD;
|
|
} else
|
|
tp->tun_flags &= ~TUN_PREPADDR;
|
|
break;
|
|
|
|
case TUNSIFHEAD:
|
|
if (*(int *)data) {
|
|
tp->tun_flags |= TUN_IFHEAD;
|
|
tp->tun_flags &= ~TUN_PREPADDR;
|
|
} else
|
|
tp->tun_flags &= ~TUN_IFHEAD;
|
|
break;
|
|
|
|
case TUNGIFHEAD:
|
|
*(int *)data = (tp->tun_flags & TUN_IFHEAD);
|
|
break;
|
|
|
|
case FIONBIO:
|
|
if (*(int *)data)
|
|
tp->tun_flags |= TUN_NBIO;
|
|
else
|
|
tp->tun_flags &= ~TUN_NBIO;
|
|
break;
|
|
|
|
case FIOASYNC:
|
|
if (*(int *)data)
|
|
tp->tun_flags |= TUN_ASYNC;
|
|
else
|
|
tp->tun_flags &= ~TUN_ASYNC;
|
|
break;
|
|
|
|
case FIONREAD:
|
|
if (tp->tun_if.if_snd.ifq_head)
|
|
*(int *)data = tp->tun_if.if_snd.ifq_head->m_pkthdr.len;
|
|
else
|
|
*(int *)data = 0;
|
|
break;
|
|
|
|
case TIOCSPGRP:
|
|
case FIOSETOWN:
|
|
error = fsetown(&tp->tun_pgid, cmd, data);
|
|
break;
|
|
|
|
case TIOCGPGRP:
|
|
case FIOGETOWN:
|
|
error = fgetown(tp->tun_pgid, cmd, data);
|
|
break;
|
|
|
|
default:
|
|
error = ENOTTY;
|
|
}
|
|
|
|
out:
|
|
simple_unlock(&tp->tun_lock);
|
|
out_nolock:
|
|
splx(s);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* The cdevsw read interface - reads a packet at a time, or at
|
|
* least as much of a packet as can be read.
|
|
*/
|
|
int
|
|
tunread(dev_t dev, struct uio *uio, int ioflag)
|
|
{
|
|
struct tun_softc *tp;
|
|
struct ifnet *ifp;
|
|
struct mbuf *m, *m0;
|
|
int error = 0, len, s, index;
|
|
|
|
s = splnet();
|
|
tp = tun_find_unit(dev);
|
|
|
|
/* interface was "destroyed" already */
|
|
if (tp == NULL) {
|
|
error = ENXIO;
|
|
goto out_nolock;
|
|
}
|
|
|
|
index = tp->tun_if.if_index;
|
|
ifp = &tp->tun_if;
|
|
|
|
TUNDEBUG ("%s: read\n", ifp->if_xname);
|
|
if ((tp->tun_flags & TUN_READY) != TUN_READY) {
|
|
TUNDEBUG ("%s: not ready 0%o\n", ifp->if_xname, tp->tun_flags);
|
|
error = EHOSTDOWN;
|
|
goto out;
|
|
}
|
|
|
|
tp->tun_flags &= ~TUN_RWAIT;
|
|
|
|
do {
|
|
IFQ_DEQUEUE(&ifp->if_snd, m0);
|
|
if (m0 == 0) {
|
|
if (tp->tun_flags & TUN_NBIO) {
|
|
error = EWOULDBLOCK;
|
|
goto out;
|
|
}
|
|
tp->tun_flags |= TUN_RWAIT;
|
|
if (ltsleep((void *)tp, PZERO|PCATCH|PNORELOCK,
|
|
"tunread", 0, &tp->tun_lock) != 0) {
|
|
error = EINTR;
|
|
goto out_nolock;
|
|
} else {
|
|
/*
|
|
* Maybe the interface was destroyed while
|
|
* we were sleeping, so let's ensure that
|
|
* we're looking at the same (valid) tun
|
|
* interface before looping.
|
|
*/
|
|
tp = tun_find_unit(dev);
|
|
if (tp == NULL) {
|
|
error = ENXIO;
|
|
goto out_nolock;
|
|
}
|
|
if (tp->tun_if.if_index != index) {
|
|
error = ENXIO;
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
} while (m0 == 0);
|
|
|
|
simple_unlock(&tp->tun_lock);
|
|
splx(s);
|
|
|
|
/* Copy the mbuf chain */
|
|
while (m0 && uio->uio_resid > 0 && error == 0) {
|
|
len = min(uio->uio_resid, m0->m_len);
|
|
if (len != 0)
|
|
error = uiomove(mtod(m0, void *), len, uio);
|
|
MFREE(m0, m);
|
|
m0 = m;
|
|
}
|
|
|
|
if (m0) {
|
|
TUNDEBUG("Dropping mbuf\n");
|
|
m_freem(m0);
|
|
}
|
|
if (error)
|
|
ifp->if_ierrors++;
|
|
|
|
return (error);
|
|
|
|
out:
|
|
simple_unlock(&tp->tun_lock);
|
|
out_nolock:
|
|
splx(s);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* the cdevsw write interface - an atomic write is a packet - or else!
|
|
*/
|
|
int
|
|
tunwrite(dev_t dev, struct uio *uio, int ioflag)
|
|
{
|
|
struct tun_softc *tp;
|
|
struct ifnet *ifp;
|
|
struct mbuf *top, **mp, *m;
|
|
struct ifqueue *ifq;
|
|
struct sockaddr dst;
|
|
int isr, error = 0, s, tlen, mlen;
|
|
uint32_t family;
|
|
|
|
s = splnet();
|
|
tp = tun_find_unit(dev);
|
|
|
|
/* interface was "destroyed" already */
|
|
if (tp == NULL) {
|
|
error = ENXIO;
|
|
goto out_nolock;
|
|
}
|
|
|
|
/* Unlock until we've got the data */
|
|
simple_unlock(&tp->tun_lock);
|
|
splx(s);
|
|
|
|
ifp = &tp->tun_if;
|
|
|
|
TUNDEBUG("%s: tunwrite\n", ifp->if_xname);
|
|
|
|
if (tp->tun_flags & TUN_PREPADDR) {
|
|
if (uio->uio_resid < sizeof(dst)) {
|
|
error = EIO;
|
|
goto out0;
|
|
}
|
|
error = uiomove((void *)&dst, sizeof(dst), uio);
|
|
if (dst.sa_len > sizeof(dst)) {
|
|
/* Duh.. */
|
|
char discard;
|
|
int n = dst.sa_len - sizeof(dst);
|
|
while (n--)
|
|
if ((error = uiomove(&discard, 1, uio)) != 0) {
|
|
goto out0;
|
|
}
|
|
}
|
|
} else if (tp->tun_flags & TUN_IFHEAD) {
|
|
if (uio->uio_resid < sizeof(family)){
|
|
error = EIO;
|
|
goto out0;
|
|
}
|
|
error = uiomove((void *)&family, sizeof(family), uio);
|
|
dst.sa_family = ntohl(family);
|
|
} else {
|
|
#ifdef INET
|
|
dst.sa_family = AF_INET;
|
|
#endif
|
|
}
|
|
|
|
if (uio->uio_resid > TUNMTU) {
|
|
TUNDEBUG("%s: len=%lu!\n", ifp->if_xname,
|
|
(unsigned long)uio->uio_resid);
|
|
error = EIO;
|
|
goto out0;
|
|
}
|
|
|
|
switch (dst.sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
ifq = &ipintrq;
|
|
isr = NETISR_IP;
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
ifq = &ip6intrq;
|
|
isr = NETISR_IPV6;
|
|
break;
|
|
#endif
|
|
default:
|
|
error = EAFNOSUPPORT;
|
|
goto out0;
|
|
}
|
|
|
|
tlen = uio->uio_resid;
|
|
|
|
/* get a header mbuf */
|
|
MGETHDR(m, M_DONTWAIT, MT_DATA);
|
|
if (m == NULL) {
|
|
error = ENOBUFS;
|
|
goto out0;
|
|
}
|
|
mlen = MHLEN;
|
|
|
|
top = NULL;
|
|
mp = ⊤
|
|
while (error == 0 && uio->uio_resid > 0) {
|
|
m->m_len = min(mlen, uio->uio_resid);
|
|
error = uiomove(mtod(m, void *), m->m_len, uio);
|
|
*mp = m;
|
|
mp = &m->m_next;
|
|
if (error == 0 && uio->uio_resid > 0) {
|
|
MGET(m, M_DONTWAIT, MT_DATA);
|
|
if (m == NULL) {
|
|
error = ENOBUFS;
|
|
break;
|
|
}
|
|
mlen = MLEN;
|
|
}
|
|
}
|
|
if (error) {
|
|
if (top != NULL)
|
|
m_freem (top);
|
|
ifp->if_ierrors++;
|
|
goto out0;
|
|
}
|
|
|
|
top->m_pkthdr.len = tlen;
|
|
top->m_pkthdr.rcvif = ifp;
|
|
|
|
bpf_mtap_af(ifp, dst.sa_family, top);
|
|
|
|
s = splnet();
|
|
simple_lock(&tp->tun_lock);
|
|
if ((tp->tun_flags & TUN_INITED) == 0) {
|
|
/* Interface was destroyed */
|
|
error = ENXIO;
|
|
goto out;
|
|
}
|
|
if (IF_QFULL(ifq)) {
|
|
IF_DROP(ifq);
|
|
ifp->if_collisions++;
|
|
m_freem(top);
|
|
error = ENOBUFS;
|
|
goto out;
|
|
}
|
|
|
|
IF_ENQUEUE(ifq, top);
|
|
ifp->if_ipackets++;
|
|
ifp->if_ibytes += tlen;
|
|
schednetisr(isr);
|
|
out:
|
|
simple_unlock(&tp->tun_lock);
|
|
out_nolock:
|
|
splx(s);
|
|
out0:
|
|
return (error);
|
|
}
|
|
|
|
#ifdef ALTQ
|
|
/*
|
|
* Start packet transmission on the interface.
|
|
* when the interface queue is rate-limited by ALTQ or TBR,
|
|
* if_start is needed to drain packets from the queue in order
|
|
* to notify readers when outgoing packets become ready.
|
|
*
|
|
* Should be called at splnet.
|
|
*/
|
|
static void
|
|
tunstart(struct ifnet *ifp)
|
|
{
|
|
struct tun_softc *tp = ifp->if_softc;
|
|
|
|
if (!ALTQ_IS_ENABLED(&ifp->if_snd) && !TBR_IS_ENABLED(&ifp->if_snd))
|
|
return;
|
|
|
|
simple_lock(&tp->tun_lock);
|
|
if (!IF_IS_EMPTY(&ifp->if_snd)) {
|
|
if (tp->tun_flags & TUN_RWAIT) {
|
|
tp->tun_flags &= ~TUN_RWAIT;
|
|
wakeup((void *)tp);
|
|
}
|
|
if (tp->tun_flags & TUN_ASYNC && tp->tun_pgid)
|
|
softint_schedule(tp->tun_osih);
|
|
|
|
selnotify(&tp->tun_rsel, 0, 0);
|
|
}
|
|
simple_unlock(&tp->tun_lock);
|
|
}
|
|
#endif /* ALTQ */
|
|
/*
|
|
* 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.
|
|
*/
|
|
int
|
|
tunpoll(dev_t dev, int events, struct lwp *l)
|
|
{
|
|
struct tun_softc *tp;
|
|
struct ifnet *ifp;
|
|
int s, revents = 0;
|
|
|
|
s = splnet();
|
|
tp = tun_find_unit(dev);
|
|
|
|
/* interface was "destroyed" already */
|
|
if (tp == NULL)
|
|
goto out_nolock;
|
|
|
|
ifp = &tp->tun_if;
|
|
|
|
TUNDEBUG("%s: tunpoll\n", ifp->if_xname);
|
|
|
|
if (events & (POLLIN | POLLRDNORM)) {
|
|
if (!IFQ_IS_EMPTY(&ifp->if_snd)) {
|
|
TUNDEBUG("%s: tunpoll q=%d\n", ifp->if_xname,
|
|
ifp->if_snd.ifq_len);
|
|
revents |= events & (POLLIN | POLLRDNORM);
|
|
} else {
|
|
TUNDEBUG("%s: tunpoll waiting\n", ifp->if_xname);
|
|
selrecord(l, &tp->tun_rsel);
|
|
}
|
|
}
|
|
|
|
if (events & (POLLOUT | POLLWRNORM))
|
|
revents |= events & (POLLOUT | POLLWRNORM);
|
|
|
|
simple_unlock(&tp->tun_lock);
|
|
out_nolock:
|
|
splx(s);
|
|
return (revents);
|
|
}
|
|
|
|
static void
|
|
filt_tunrdetach(struct knote *kn)
|
|
{
|
|
struct tun_softc *tp = kn->kn_hook;
|
|
int s;
|
|
|
|
s = splnet();
|
|
SLIST_REMOVE(&tp->tun_rsel.sel_klist, kn, knote, kn_selnext);
|
|
splx(s);
|
|
}
|
|
|
|
static int
|
|
filt_tunread(struct knote *kn, long hint)
|
|
{
|
|
struct tun_softc *tp = kn->kn_hook;
|
|
struct ifnet *ifp = &tp->tun_if;
|
|
struct mbuf *m;
|
|
int s;
|
|
|
|
s = splnet();
|
|
IF_POLL(&ifp->if_snd, m);
|
|
if (m == NULL) {
|
|
splx(s);
|
|
return (0);
|
|
}
|
|
|
|
for (kn->kn_data = 0; m != NULL; m = m->m_next)
|
|
kn->kn_data += m->m_len;
|
|
|
|
splx(s);
|
|
return (1);
|
|
}
|
|
|
|
static const struct filterops tunread_filtops =
|
|
{ 1, NULL, filt_tunrdetach, filt_tunread };
|
|
|
|
static const struct filterops tun_seltrue_filtops =
|
|
{ 1, NULL, filt_tunrdetach, filt_seltrue };
|
|
|
|
int
|
|
tunkqfilter(dev_t dev, struct knote *kn)
|
|
{
|
|
struct tun_softc *tp;
|
|
struct klist *klist;
|
|
int rv = 0, s;
|
|
|
|
s = splnet();
|
|
tp = tun_find_unit(dev);
|
|
if (tp == NULL)
|
|
goto out_nolock;
|
|
|
|
switch (kn->kn_filter) {
|
|
case EVFILT_READ:
|
|
klist = &tp->tun_rsel.sel_klist;
|
|
kn->kn_fop = &tunread_filtops;
|
|
break;
|
|
|
|
case EVFILT_WRITE:
|
|
klist = &tp->tun_rsel.sel_klist;
|
|
kn->kn_fop = &tun_seltrue_filtops;
|
|
break;
|
|
|
|
default:
|
|
rv = EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
kn->kn_hook = tp;
|
|
|
|
SLIST_INSERT_HEAD(klist, kn, kn_selnext);
|
|
|
|
out:
|
|
simple_unlock(&tp->tun_lock);
|
|
out_nolock:
|
|
splx(s);
|
|
return (rv);
|
|
}
|