if_tun.c revision 256008
112115Sdyson/* $NetBSD: if_tun.c,v 1.14 1994/06/29 06:36:25 cgd Exp $ */ 212115Sdyson 312115Sdyson/*- 412115Sdyson * Copyright (c) 1988, Julian Onions <jpo@cs.nott.ac.uk> 512115Sdyson * Nottingham University 1987. 612115Sdyson * 712115Sdyson * This source may be freely distributed, however I would be interested 812115Sdyson * in any changes that are made. 912115Sdyson * 1012115Sdyson * This driver takes packets off the IP i/f and hands them up to a 1112115Sdyson * user process to have its wicked way with. This driver has it's 1212115Sdyson * roots in a similar driver written by Phil Cockcroft (formerly) at 1312115Sdyson * UCL. This driver is based much more on read/write/poll mode of 1412115Sdyson * operation though. 1512115Sdyson * 1612115Sdyson * $FreeBSD: head/sys/net/if_tun.c 256008 2013-10-02 20:44:36Z glebius $ 1712115Sdyson */ 1812115Sdyson 1912115Sdyson#include "opt_atalk.h" 2012115Sdyson#include "opt_inet.h" 2112115Sdyson#include "opt_inet6.h" 2212115Sdyson#include "opt_ipx.h" 2312115Sdyson 2412115Sdyson#include <sys/param.h> 2512115Sdyson#include <sys/priv.h> 2612115Sdyson#include <sys/proc.h> 2712115Sdyson#include <sys/systm.h> 2812115Sdyson#include <sys/jail.h> 2912115Sdyson#include <sys/mbuf.h> 3012115Sdyson#include <sys/module.h> 3112115Sdyson#include <sys/socket.h> 3212115Sdyson#include <sys/fcntl.h> 3312115Sdyson#include <sys/filio.h> 3412115Sdyson#include <sys/sockio.h> 3512115Sdyson#include <sys/ttycom.h> 3612115Sdyson#include <sys/poll.h> 3712115Sdyson#include <sys/selinfo.h> 3812115Sdyson#include <sys/signalvar.h> 3912115Sdyson#include <sys/filedesc.h> 4012115Sdyson#include <sys/kernel.h> 4112115Sdyson#include <sys/sysctl.h> 4213260Swollman#include <sys/conf.h> 4312115Sdyson#include <sys/uio.h> 4412115Sdyson#include <sys/malloc.h> 4512115Sdyson#include <sys/random.h> 4612115Sdyson 4712115Sdyson#include <net/if.h> 4812115Sdyson#include <net/if_clone.h> 4912115Sdyson#include <net/if_types.h> 5012115Sdyson#include <net/netisr.h> 5112115Sdyson#include <net/route.h> 5229906Skato#include <net/vnet.h> 5324131Sbde#ifdef INET 5412115Sdyson#include <netinet/in.h> 5512115Sdyson#endif 5612115Sdyson#include <net/bpf.h> 5712115Sdyson#include <net/if_tun.h> 5812115Sdyson 5912115Sdyson#include <sys/queue.h> 6012115Sdyson#include <sys/condvar.h> 6112115Sdyson 6212115Sdyson#include <security/mac/mac_framework.h> 6312115Sdyson 6412115Sdyson/* 6512115Sdyson * tun_list is protected by global tunmtx. Other mutable fields are 6612115Sdyson * protected by tun->tun_mtx, or by their owning subsystem. tun_dev is 6712115Sdyson * static for the duration of a tunnel interface. 6812115Sdyson */ 6912115Sdysonstruct tun_softc { 7028270Swollman TAILQ_ENTRY(tun_softc) tun_list; 7112911Sphk struct cdev *tun_dev; 7212911Sphk u_short tun_flags; /* misc flags */ 7312911Sphk#define TUN_OPEN 0x0001 7412911Sphk#define TUN_INITED 0x0002 7512911Sphk#define TUN_RCOLL 0x0004 7612911Sphk#define TUN_IASET 0x0008 7712911Sphk#define TUN_DSTADDR 0x0010 7812911Sphk#define TUN_LMODE 0x0020 7912911Sphk#define TUN_RWAIT 0x0040 8012911Sphk#define TUN_ASYNC 0x0080 8112911Sphk#define TUN_IFHEAD 0x0100 8212911Sphk 8312911Sphk#define TUN_READY (TUN_OPEN | TUN_INITED) 8412115Sdyson 8531315Sbde /* 8630280Sphk * XXXRW: tun_pid is used to exclusively lock /dev/tun. Is this 8712911Sphk * actually needed? Can we just return EBUSY if already open? 8812115Sdyson * Problem is that this involved inherent races when a tun device 8912115Sdyson * is handed off from one process to another, as opposed to just 9012115Sdyson * being slightly stale informationally. 9112115Sdyson */ 9212115Sdyson pid_t tun_pid; /* owning pid */ 9312115Sdyson struct ifnet *tun_ifp; /* the interface */ 9412115Sdyson struct sigio *tun_sigio; /* information for async I/O */ 9512115Sdyson struct selinfo tun_rsel; /* read select */ 9612115Sdyson struct mtx tun_mtx; /* protect mutable softc fields */ 9712115Sdyson struct cv tun_cv; /* protect against ref'd dev destroy */ 9812115Sdyson}; 9912115Sdyson#define TUN2IFP(sc) ((sc)->tun_ifp) 10012115Sdyson 10138909Sbde#define TUNDEBUG if (tundebug) if_printf 10212115Sdyson 10312115Sdyson/* 10412115Sdyson * All mutable global variables in if_tun are locked using tunmtx, with 10512911Sphk * the exception of tundebug, which is used unlocked, and tunclones, 10612115Sdyson * which is static after setup. 10716322Sgpalmer */ 10816322Sgpalmerstatic struct mtx tunmtx; 10916322Sgpalmerstatic const char tunname[] = "tun"; 11016322Sgpalmerstatic MALLOC_DEFINE(M_TUN, tunname, "Tunnel Interface"); 11116322Sgpalmerstatic int tundebug = 0; 11216322Sgpalmerstatic int tundclone = 1; 11316322Sgpalmerstatic struct clonedevs *tunclones; 11412115Sdysonstatic TAILQ_HEAD(,tun_softc) tunhead = TAILQ_HEAD_INITIALIZER(tunhead); 11516322SgpalmerSYSCTL_INT(_debug, OID_AUTO, if_tun_debug, CTLFLAG_RW, &tundebug, 0, ""); 11612115Sdyson 11712115SdysonSYSCTL_DECL(_net_link); 11812115Sdysonstatic SYSCTL_NODE(_net_link, OID_AUTO, tun, CTLFLAG_RW, 0, 11912115Sdyson "IP tunnel software network interface."); 12012115SdysonSYSCTL_INT(_net_link_tun, OID_AUTO, devfs_cloning, CTLFLAG_RW, &tundclone, 0, 12112911Sphk "Enable legacy devfs interface creation."); 12212115Sdyson 12312115SdysonTUNABLE_INT("net.link.tun.devfs_cloning", &tundclone); 12412115Sdyson 12512115Sdysonstatic void tunclone(void *arg, struct ucred *cred, char *name, 12612115Sdyson int namelen, struct cdev **dev); 12712115Sdysonstatic void tuncreate(const char *name, struct cdev *dev); 12812115Sdysonstatic int tunifioctl(struct ifnet *, u_long, caddr_t); 12912115Sdysonstatic void tuninit(struct ifnet *); 13012115Sdysonstatic int tunmodevent(module_t, int, void *); 13129208Sbdestatic int tunoutput(struct ifnet *, struct mbuf *, 13229208Sbde const struct sockaddr *, struct route *ro); 13329208Sbdestatic void tunstart(struct ifnet *); 13429208Sbde 13512115Sdysonstatic int tun_clone_create(struct if_clone *, int, caddr_t); 13612115Sdysonstatic void tun_clone_destroy(struct ifnet *); 13712115Sdysonstatic struct if_clone *tun_cloner; 13812115Sdyson 13929888Skatostatic d_open_t tunopen; 14029888Skatostatic d_close_t tunclose; 14129888Skatostatic d_read_t tunread; 14229888Skatostatic d_write_t tunwrite; 14312115Sdysonstatic d_ioctl_t tunioctl; 14412115Sdysonstatic d_poll_t tunpoll; 14512115Sdysonstatic d_kqfilter_t tunkqfilter; 14612115Sdyson 14712115Sdysonstatic int tunkqread(struct knote *, long); 14812115Sdysonstatic int tunkqwrite(struct knote *, long); 14912115Sdysonstatic void tunkqdetach(struct knote *); 15012115Sdyson 15112115Sdysonstatic struct filterops tun_read_filterops = { 15230469Sjulian .f_isfd = 1, 15312115Sdyson .f_attach = NULL, 15412115Sdyson .f_detach = tunkqdetach, 15512115Sdyson .f_event = tunkqread, 15612115Sdyson}; 15712115Sdyson 15812115Sdysonstatic struct filterops tun_write_filterops = { 15912115Sdyson .f_isfd = 1, 16012115Sdyson .f_attach = NULL, 16112115Sdyson .f_detach = tunkqdetach, 16212115Sdyson .f_event = tunkqwrite, 16312115Sdyson}; 16412115Sdyson 16512115Sdysonstatic struct cdevsw tun_cdevsw = { 16612115Sdyson .d_version = D_VERSION, 16712115Sdyson .d_flags = D_NEEDMINOR, 16812115Sdyson .d_open = tunopen, 16916322Sgpalmer .d_close = tunclose, 17012115Sdyson .d_read = tunread, 17112115Sdyson .d_write = tunwrite, 17212115Sdyson .d_ioctl = tunioctl, 17312115Sdyson .d_poll = tunpoll, 17412115Sdyson .d_kqfilter = tunkqfilter, 17512115Sdyson .d_name = tunname, 17612911Sphk}; 17712115Sdyson 17812115Sdysonstatic int 17912115Sdysontun_clone_create(struct if_clone *ifc, int unit, caddr_t params) 18012115Sdyson{ 18112115Sdyson struct cdev *dev; 18212115Sdyson int i; 18312115Sdyson 18412115Sdyson /* find any existing device, or allocate new unit number */ 18512115Sdyson i = clone_create(&tunclones, &tun_cdevsw, &unit, &dev, 0); 18612115Sdyson if (i) { 18712115Sdyson /* No preexisting struct cdev *, create one */ 18812115Sdyson dev = make_dev(&tun_cdevsw, unit, 18912115Sdyson UID_UUCP, GID_DIALER, 0600, "%s%d", tunname, unit); 19039028Sbde } 19112115Sdyson tuncreate(tunname, dev); 19243301Sdillon 19312115Sdyson return (0); 19412115Sdyson} 19512115Sdyson 19612115Sdysonstatic void 19729888Skatotunclone(void *arg, struct ucred *cred, char *name, int namelen, 19829888Skato struct cdev **dev) 19912115Sdyson{ 20012115Sdyson char devname[SPECNAMELEN + 1]; 20112115Sdyson int u, i, append_unit; 20212115Sdyson 20312115Sdyson if (*dev != NULL) 20429888Skato return; 20529888Skato 20629888Skato /* 20729888Skato * If tun cloning is enabled, only the superuser can create an 20812115Sdyson * interface. 20912115Sdyson */ 21012115Sdyson if (!tundclone || priv_check_cred(cred, PRIV_NET_IFCREATE, 0) != 0) 21112115Sdyson return; 21222521Sdyson 21312115Sdyson if (strcmp(name, tunname) == 0) { 21412115Sdyson u = -1; 21522521Sdyson } else if (dev_stdclone(name, NULL, tunname, &u) != 1) 21639670Sbde return; /* Don't recognise the name */ 21739670Sbde if (u != -1 && u > IF_MAXUNIT) 21839670Sbde return; /* Unit number too high */ 21939670Sbde 22039670Sbde if (u == -1) 22112115Sdyson append_unit = 1; 22212115Sdyson else 22312115Sdyson append_unit = 0; 22412115Sdyson 22512115Sdyson CURVNET_SET(CRED_TO_VNET(cred)); 22639028Sbde /* find any existing device, or allocate new unit number */ 22739028Sbde i = clone_create(&tunclones, &tun_cdevsw, &u, dev, 0); 22839028Sbde if (i) { 22939028Sbde if (append_unit) { 23039028Sbde namelen = snprintf(devname, sizeof(devname), "%s%d", 23139028Sbde name, u); 23239028Sbde name = devname; 23339028Sbde } 23443301Sdillon /* No preexisting struct cdev *, create one */ 23543301Sdillon *dev = make_dev_credf(MAKEDEV_REF, &tun_cdevsw, u, cred, 23639028Sbde UID_UUCP, GID_DIALER, 0600, "%s", name); 23739028Sbde } 23839028Sbde 23939028Sbde if_clone_create(name, namelen, NULL); 24039028Sbde CURVNET_RESTORE(); 24139028Sbde} 24239670Sbde 24339670Sbdestatic void 24439670Sbdetun_destroy(struct tun_softc *tp) 24539670Sbde{ 24639670Sbde struct cdev *dev; 24739670Sbde 24839670Sbde mtx_lock(&tp->tun_mtx); 24939670Sbde if ((tp->tun_flags & TUN_OPEN) != 0) 25039670Sbde cv_wait_unlock(&tp->tun_cv, &tp->tun_mtx); 25139670Sbde else 25239670Sbde mtx_unlock(&tp->tun_mtx); 25339670Sbde 25439670Sbde CURVNET_SET(TUN2IFP(tp)->if_vnet); 25512115Sdyson dev = tp->tun_dev; 25612115Sdyson bpfdetach(TUN2IFP(tp)); 25739670Sbde if_detach(TUN2IFP(tp)); 25812115Sdyson if_free(TUN2IFP(tp)); 25912115Sdyson destroy_dev(dev); 26012115Sdyson seldrain(&tp->tun_rsel); 26112115Sdyson knlist_clear(&tp->tun_rsel.si_note, 0); 26212115Sdyson knlist_destroy(&tp->tun_rsel.si_note); 26312115Sdyson mtx_destroy(&tp->tun_mtx); 26412115Sdyson cv_destroy(&tp->tun_cv); 26512115Sdyson free(tp, M_TUN); 26612115Sdyson CURVNET_RESTORE(); 26712115Sdyson} 26812115Sdyson 26912115Sdysonstatic void 27012115Sdysontun_clone_destroy(struct ifnet *ifp) 27143301Sdillon{ 27212115Sdyson struct tun_softc *tp = ifp->if_softc; 27312115Sdyson 27412115Sdyson mtx_lock(&tunmtx); 27512115Sdyson TAILQ_REMOVE(&tunhead, tp, tun_list); 27612115Sdyson mtx_unlock(&tunmtx); 27712115Sdyson tun_destroy(tp); 27812115Sdyson} 27940651Sbde 28040651Sbdestatic int 28112115Sdysontunmodevent(module_t mod, int type, void *data) 28212115Sdyson{ 28312115Sdyson static eventhandler_tag tag; 28439028Sbde struct tun_softc *tp; 28539028Sbde 28639028Sbde switch (type) { 28739028Sbde case MOD_LOAD: 28839028Sbde mtx_init(&tunmtx, "tunmtx", NULL, MTX_DEF); 28939028Sbde clone_setup(&tunclones); 29039028Sbde tag = EVENTHANDLER_REGISTER(dev_clone, tunclone, 0, 1000); 29139028Sbde if (tag == NULL) 29239028Sbde return (ENOMEM); 29339028Sbde tun_cloner = if_clone_simple(tunname, tun_clone_create, 29443301Sdillon tun_clone_destroy, 0); 29539028Sbde break; 29639028Sbde case MOD_UNLOAD: 29739028Sbde if_clone_detach(tun_cloner); 29839028Sbde EVENTHANDLER_DEREGISTER(dev_clone, tag); 29939028Sbde drain_dev_clone_events(); 30039028Sbde 30129888Skato mtx_lock(&tunmtx); 30229888Skato while ((tp = TAILQ_FIRST(&tunhead)) != NULL) { 30329888Skato TAILQ_REMOVE(&tunhead, tp, tun_list); 30429888Skato mtx_unlock(&tunmtx); 30529888Skato tun_destroy(tp); 30612115Sdyson mtx_lock(&tunmtx); 30729888Skato } 30812115Sdyson mtx_unlock(&tunmtx); 30912115Sdyson clone_cleanup(&tunclones); 31012115Sdyson mtx_destroy(&tunmtx); 31112115Sdyson break; 31212115Sdyson default: 31312115Sdyson return EOPNOTSUPP; 31412115Sdyson } 31512115Sdyson return 0; 31612115Sdyson} 31712115Sdyson 31812115Sdysonstatic moduledata_t tun_mod = { 31912115Sdyson "if_tun", 32012115Sdyson tunmodevent, 32112115Sdyson 0 32212115Sdyson}; 32312115Sdyson 32412115SdysonDECLARE_MODULE(if_tun, tun_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 32512115SdysonMODULE_VERSION(if_tun, 1); 32612115Sdyson 32712115Sdysonstatic void 32812115Sdysontunstart(struct ifnet *ifp) 32912115Sdyson{ 33012115Sdyson struct tun_softc *tp = ifp->if_softc; 33112115Sdyson struct mbuf *m; 33212115Sdyson 33312115Sdyson TUNDEBUG(ifp,"%s starting\n", ifp->if_xname); 33412115Sdyson if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 33512115Sdyson IFQ_LOCK(&ifp->if_snd); 33612115Sdyson IFQ_POLL_NOLOCK(&ifp->if_snd, m); 33712115Sdyson if (m == NULL) { 33812115Sdyson IFQ_UNLOCK(&ifp->if_snd); 33912115Sdyson return; 34012115Sdyson } 34112115Sdyson IFQ_UNLOCK(&ifp->if_snd); 34212115Sdyson } 34312115Sdyson 34412115Sdyson mtx_lock(&tp->tun_mtx); 34512115Sdyson if (tp->tun_flags & TUN_RWAIT) { 34612115Sdyson tp->tun_flags &= ~TUN_RWAIT; 34712115Sdyson wakeup(tp); 34812115Sdyson } 34912115Sdyson selwakeuppri(&tp->tun_rsel, PZERO + 1); 35012115Sdyson KNOTE_LOCKED(&tp->tun_rsel.si_note, 0); 35112115Sdyson if (tp->tun_flags & TUN_ASYNC && tp->tun_sigio) { 35212115Sdyson mtx_unlock(&tp->tun_mtx); 35312115Sdyson pgsigio(&tp->tun_sigio, SIGIO, 0); 35439671Sbde } else 35512115Sdyson mtx_unlock(&tp->tun_mtx); 35612115Sdyson} 35712115Sdyson 35812115Sdyson/* XXX: should return an error code so it can fail. */ 35912115Sdysonstatic void 36012115Sdysontuncreate(const char *name, struct cdev *dev) 36112115Sdyson{ 36212115Sdyson struct tun_softc *sc; 36339671Sbde struct ifnet *ifp; 36412115Sdyson 36512115Sdyson sc = malloc(sizeof(*sc), M_TUN, M_WAITOK | M_ZERO); 36612115Sdyson mtx_init(&sc->tun_mtx, "tun_mtx", NULL, MTX_DEF); 36712115Sdyson cv_init(&sc->tun_cv, "tun_condvar"); 36812115Sdyson sc->tun_flags = TUN_INITED; 36912115Sdyson sc->tun_dev = dev; 37012115Sdyson mtx_lock(&tunmtx); 37112115Sdyson TAILQ_INSERT_TAIL(&tunhead, sc, tun_list); 37212115Sdyson mtx_unlock(&tunmtx); 37339671Sbde 37412115Sdyson ifp = sc->tun_ifp = if_alloc(IFT_PPP); 37512115Sdyson if (ifp == NULL) 37612115Sdyson panic("%s%d: failed to if_alloc() interface.\n", 37712115Sdyson name, dev2unit(dev)); 37812115Sdyson if_initname(ifp, name, dev2unit(dev)); 37912115Sdyson ifp->if_mtu = TUNMTU; 38012115Sdyson ifp->if_ioctl = tunifioctl; 38112115Sdyson ifp->if_output = tunoutput; 38212115Sdyson ifp->if_start = tunstart; 38312115Sdyson ifp->if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 38412115Sdyson ifp->if_softc = sc; 38512115Sdyson IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 38612115Sdyson ifp->if_snd.ifq_drv_maxlen = 0; 38712115Sdyson IFQ_SET_READY(&ifp->if_snd); 38812115Sdyson knlist_init_mtx(&sc->tun_rsel.si_note, &sc->tun_mtx); 38912115Sdyson ifp->if_capabilities |= IFCAP_LINKSTATE; 39012115Sdyson ifp->if_capenable |= IFCAP_LINKSTATE; 39112115Sdyson 39212115Sdyson if_attach(ifp); 39312115Sdyson bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 39412115Sdyson dev->si_drv1 = sc; 39512115Sdyson TUNDEBUG(ifp, "interface %s is created, minor = %#x\n", 39612115Sdyson ifp->if_xname, dev2unit(dev)); 39712115Sdyson} 39812115Sdyson 39912115Sdysonstatic int 40012115Sdysontunopen(struct cdev *dev, int flag, int mode, struct thread *td) 40112115Sdyson{ 40212115Sdyson struct ifnet *ifp; 40312115Sdyson struct tun_softc *tp; 40412115Sdyson 40512115Sdyson /* 40612115Sdyson * XXXRW: Non-atomic test and set of dev->si_drv1 requires 40712115Sdyson * synchronization. 40812115Sdyson */ 40912115Sdyson tp = dev->si_drv1; 41012115Sdyson if (!tp) { 41112115Sdyson tuncreate(tunname, dev); 41212115Sdyson tp = dev->si_drv1; 41312115Sdyson } 41412115Sdyson 41512115Sdyson /* 41612115Sdyson * XXXRW: This use of tun_pid is subject to error due to the 41712115Sdyson * fact that a reference to the tunnel can live beyond the 41812115Sdyson * death of the process that created it. Can we replace this 41912115Sdyson * with a simple busy flag? 42012115Sdyson */ 42112115Sdyson mtx_lock(&tp->tun_mtx); 42212115Sdyson if (tp->tun_pid != 0 && tp->tun_pid != td->td_proc->p_pid) { 42312115Sdyson mtx_unlock(&tp->tun_mtx); 42412115Sdyson return (EBUSY); 42512115Sdyson } 42612115Sdyson tp->tun_pid = td->td_proc->p_pid; 42712115Sdyson 42812115Sdyson tp->tun_flags |= TUN_OPEN; 42912115Sdyson ifp = TUN2IFP(tp); 43012115Sdyson if_link_state_change(ifp, LINK_STATE_UP); 43112115Sdyson TUNDEBUG(ifp, "open\n"); 43212115Sdyson mtx_unlock(&tp->tun_mtx); 43312115Sdyson 43412115Sdyson return (0); 43512115Sdyson} 43612115Sdyson 43712115Sdyson/* 43812115Sdyson * tunclose - close the device - mark i/f down & delete 43912115Sdyson * routing info 44012115Sdyson */ 44112115Sdysonstatic int 44212115Sdysontunclose(struct cdev *dev, int foo, int bar, struct thread *td) 44312115Sdyson{ 44412115Sdyson struct tun_softc *tp; 44512115Sdyson struct ifnet *ifp; 44612115Sdyson 44712115Sdyson tp = dev->si_drv1; 44812115Sdyson ifp = TUN2IFP(tp); 44912115Sdyson 45012115Sdyson mtx_lock(&tp->tun_mtx); 45112115Sdyson tp->tun_flags &= ~TUN_OPEN; 45212115Sdyson tp->tun_pid = 0; 45312115Sdyson 45412115Sdyson /* 45512115Sdyson * junk all pending output 45612115Sdyson */ 45712115Sdyson CURVNET_SET(ifp->if_vnet); 45812115Sdyson IFQ_PURGE(&ifp->if_snd); 45912115Sdyson 46027881Sdyson if (ifp->if_flags & IFF_UP) { 46127881Sdyson mtx_unlock(&tp->tun_mtx); 46212115Sdyson if_down(ifp); 46312115Sdyson mtx_lock(&tp->tun_mtx); 46412115Sdyson } 46527881Sdyson 46612115Sdyson /* Delete all addresses and routes which reference this interface. */ 46712115Sdyson if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 46812115Sdyson struct ifaddr *ifa; 46912115Sdyson 47012115Sdyson ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 47112115Sdyson mtx_unlock(&tp->tun_mtx); 47212115Sdyson TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 47312115Sdyson /* deal w/IPv4 PtP destination; unlocked read */ 47412115Sdyson if (ifa->ifa_addr->sa_family == AF_INET) { 47512115Sdyson rtinit(ifa, (int)RTM_DELETE, 47612115Sdyson tp->tun_flags & TUN_DSTADDR ? RTF_HOST : 0); 47712115Sdyson } else { 47812115Sdyson rtinit(ifa, (int)RTM_DELETE, 0); 47912115Sdyson } 48012115Sdyson } 48112115Sdyson if_purgeaddrs(ifp); 48212115Sdyson mtx_lock(&tp->tun_mtx); 48312115Sdyson } 48412115Sdyson if_link_state_change(ifp, LINK_STATE_DOWN); 48512115Sdyson CURVNET_RESTORE(); 48612115Sdyson 48712115Sdyson funsetown(&tp->tun_sigio); 48812115Sdyson selwakeuppri(&tp->tun_rsel, PZERO + 1); 48912115Sdyson KNOTE_LOCKED(&tp->tun_rsel.si_note, 0); 49012115Sdyson TUNDEBUG (ifp, "closed\n"); 49112115Sdyson 49212115Sdyson cv_broadcast(&tp->tun_cv); 49312115Sdyson mtx_unlock(&tp->tun_mtx); 49412115Sdyson return (0); 49512115Sdyson} 49612911Sphk 49712115Sdysonstatic void 49812115Sdysontuninit(struct ifnet *ifp) 49912115Sdyson{ 50012115Sdyson struct tun_softc *tp = ifp->if_softc; 50112115Sdyson#ifdef INET 50212115Sdyson struct ifaddr *ifa; 50312115Sdyson#endif 50412115Sdyson 50512115Sdyson TUNDEBUG(ifp, "tuninit\n"); 50612115Sdyson 50712147Sdyson mtx_lock(&tp->tun_mtx); 50812115Sdyson ifp->if_flags |= IFF_UP; 50912115Sdyson ifp->if_drv_flags |= IFF_DRV_RUNNING; 51012115Sdyson getmicrotime(&ifp->if_lastchange); 51112115Sdyson 51212115Sdyson#ifdef INET 51312115Sdyson if_addr_rlock(ifp); 51412115Sdyson TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 51512115Sdyson if (ifa->ifa_addr->sa_family == AF_INET) { 51612115Sdyson struct sockaddr_in *si; 51712115Sdyson 51812115Sdyson si = (struct sockaddr_in *)ifa->ifa_addr; 51912115Sdyson if (si->sin_addr.s_addr) 52012115Sdyson tp->tun_flags |= TUN_IASET; 52143301Sdillon 52212115Sdyson si = (struct sockaddr_in *)ifa->ifa_dstaddr; 52312115Sdyson if (si && si->sin_addr.s_addr) 52412115Sdyson tp->tun_flags |= TUN_DSTADDR; 52512115Sdyson } 52612115Sdyson } 52712115Sdyson if_addr_runlock(ifp); 52812115Sdyson#endif 52912115Sdyson mtx_unlock(&tp->tun_mtx); 53012115Sdyson} 53112115Sdyson 53212115Sdyson/* 53312115Sdyson * Process an ioctl request. 53412115Sdyson */ 53512115Sdysonstatic int 53612115Sdysontunifioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 53712115Sdyson{ 53843301Sdillon struct ifreq *ifr = (struct ifreq *)data; 53912115Sdyson struct tun_softc *tp = ifp->if_softc; 54012115Sdyson struct ifstat *ifs; 54112115Sdyson int error = 0; 54212115Sdyson 54312115Sdyson switch(cmd) { 54412115Sdyson case SIOCGIFSTATUS: 54512115Sdyson ifs = (struct ifstat *)data; 54612115Sdyson mtx_lock(&tp->tun_mtx); 54712115Sdyson if (tp->tun_pid) 54812115Sdyson sprintf(ifs->ascii + strlen(ifs->ascii), 54939678Sbde "\tOpened by PID %d\n", tp->tun_pid); 55012115Sdyson mtx_unlock(&tp->tun_mtx); 55139678Sbde break; 55239678Sbde case SIOCSIFADDR: 55339678Sbde tuninit(ifp); 55439678Sbde TUNDEBUG(ifp, "address set\n"); 55512115Sdyson break; 55612115Sdyson case SIOCSIFMTU: 55712115Sdyson ifp->if_mtu = ifr->ifr_mtu; 55812115Sdyson TUNDEBUG(ifp, "mtu set\n"); 55939678Sbde break; 56039678Sbde case SIOCSIFFLAGS: 56112115Sdyson case SIOCADDMULTI: 56212115Sdyson case SIOCDELMULTI: 56312115Sdyson break; 56439678Sbde default: 56539678Sbde error = EINVAL; 56639678Sbde } 56712115Sdyson return (error); 56839678Sbde} 56912115Sdyson 57012115Sdyson/* 57112115Sdyson * tunoutput - queue packets from higher level ready to put out. 57212115Sdyson */ 57312115Sdysonstatic int 57412115Sdysontunoutput(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst, 57539678Sbde struct route *ro) 57612115Sdyson{ 57739678Sbde struct tun_softc *tp = ifp->if_softc; 57839678Sbde u_short cached_tun_flags; 57912115Sdyson int error; 58012115Sdyson u_int32_t af; 58112115Sdyson 58212115Sdyson TUNDEBUG (ifp, "tunoutput\n"); 58339678Sbde 58439678Sbde#ifdef MAC 58512115Sdyson error = mac_ifnet_check_transmit(ifp, m0); 58612115Sdyson if (error) { 58739678Sbde m_freem(m0); 58812115Sdyson return (error); 58939678Sbde } 59012115Sdyson#endif 59112115Sdyson 59212115Sdyson /* Could be unlocked read? */ 59312115Sdyson mtx_lock(&tp->tun_mtx); 59412115Sdyson cached_tun_flags = tp->tun_flags; 59512115Sdyson mtx_unlock(&tp->tun_mtx); 59612911Sphk if ((cached_tun_flags & TUN_READY) != TUN_READY) { 59712115Sdyson TUNDEBUG (ifp, "not ready 0%o\n", tp->tun_flags); 59812115Sdyson m_freem (m0); 59912115Sdyson return (EHOSTDOWN); 60012115Sdyson } 60112115Sdyson 60212115Sdyson if ((ifp->if_flags & IFF_UP) != IFF_UP) { 60312115Sdyson m_freem (m0); 60412115Sdyson return (EHOSTDOWN); 60512115Sdyson } 60612115Sdyson 60712115Sdyson /* BPF writes need to be handled specially. */ 60812115Sdyson if (dst->sa_family == AF_UNSPEC) 60912115Sdyson bcopy(dst->sa_data, &af, sizeof(af)); 61012115Sdyson else 61112115Sdyson af = dst->sa_family; 61212115Sdyson 61312115Sdyson if (bpf_peers_present(ifp->if_bpf)) 61412115Sdyson bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m0); 61512115Sdyson 61612115Sdyson /* prepend sockaddr? this may abort if the mbuf allocation fails */ 61712115Sdyson if (cached_tun_flags & TUN_LMODE) { 61843301Sdillon /* allocate space for sockaddr */ 61912115Sdyson M_PREPEND(m0, dst->sa_len, M_NOWAIT); 62012115Sdyson 62112115Sdyson /* if allocation failed drop packet */ 62243301Sdillon if (m0 == NULL) { 62312115Sdyson ifp->if_iqdrops++; 62412115Sdyson ifp->if_oerrors++; 62512115Sdyson return (ENOBUFS); 62612115Sdyson } else { 62712115Sdyson bcopy(dst, m0->m_data, dst->sa_len); 62812115Sdyson } 62912115Sdyson } 63043301Sdillon 63112115Sdyson if (cached_tun_flags & TUN_IFHEAD) { 63212115Sdyson /* Prepend the address family */ 63312115Sdyson M_PREPEND(m0, 4, M_NOWAIT); 63412115Sdyson 63512115Sdyson /* if allocation failed drop packet */ 63612115Sdyson if (m0 == NULL) { 63712115Sdyson ifp->if_iqdrops++; 63812115Sdyson ifp->if_oerrors++; 63912115Sdyson return (ENOBUFS); 64012115Sdyson } else 64143301Sdillon *(u_int32_t *)m0->m_data = htonl(af); 64212115Sdyson } else { 64312115Sdyson#ifdef INET 64412115Sdyson if (af != AF_INET) 64512115Sdyson#endif 64612115Sdyson { 64712115Sdyson m_freem(m0); 64812115Sdyson return (EAFNOSUPPORT); 64912115Sdyson } 65012115Sdyson } 65112115Sdyson 65212115Sdyson error = (ifp->if_transmit)(ifp, m0); 65312115Sdyson if (error) 65412115Sdyson return (ENOBUFS); 65539670Sbde ifp->if_opackets++; 65639670Sbde return (0); 65739670Sbde} 65839670Sbde 65939670Sbde/* 66039670Sbde * the cdevsw interface is now pretty minimal. 66139670Sbde */ 66239670Sbdestatic int 66339670Sbdetunioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, 66439670Sbde struct thread *td) 66539670Sbde{ 66639670Sbde int error; 66712115Sdyson struct tun_softc *tp = dev->si_drv1; 66812115Sdyson struct tuninfo *tunp; 66930280Sphk 67030474Sphk switch (cmd) { 67130474Sphk case TUNSIFINFO: 67230492Sphk tunp = (struct tuninfo *)data; 67330474Sphk if (tunp->mtu < IF_MINMTU) 67430474Sphk return (EINVAL); 67512115Sdyson if (TUN2IFP(tp)->if_mtu != tunp->mtu) { 67612115Sdyson error = priv_check(td, PRIV_NET_SETIFMTU); 67712115Sdyson if (error) 67812115Sdyson return (error); 67912115Sdyson } 68012115Sdyson mtx_lock(&tp->tun_mtx); 68112115Sdyson TUN2IFP(tp)->if_mtu = tunp->mtu; 68212115Sdyson TUN2IFP(tp)->if_type = tunp->type; 68312115Sdyson TUN2IFP(tp)->if_baudrate = tunp->baudrate; 68439671Sbde mtx_unlock(&tp->tun_mtx); 68539671Sbde break; 68639671Sbde case TUNGIFINFO: 68739671Sbde tunp = (struct tuninfo *)data; 68839671Sbde mtx_lock(&tp->tun_mtx); 68939671Sbde tunp->mtu = TUN2IFP(tp)->if_mtu; 69012115Sdyson tunp->type = TUN2IFP(tp)->if_type; 69112115Sdyson tunp->baudrate = TUN2IFP(tp)->if_baudrate; 69212115Sdyson mtx_unlock(&tp->tun_mtx); 69312115Sdyson break; 69412115Sdyson case TUNSDEBUG: 69512115Sdyson tundebug = *(int *)data; 69612115Sdyson break; 69739670Sbde case TUNGDEBUG: 69812115Sdyson *(int *)data = tundebug; 69912115Sdyson break; 70012115Sdyson case TUNSLMODE: 70112115Sdyson mtx_lock(&tp->tun_mtx); 70212115Sdyson if (*(int *)data) { 70312115Sdyson tp->tun_flags |= TUN_LMODE; 70438909Sbde tp->tun_flags &= ~TUN_IFHEAD; 70512115Sdyson } else 70612115Sdyson tp->tun_flags &= ~TUN_LMODE; 70712115Sdyson mtx_unlock(&tp->tun_mtx); 70812115Sdyson break; 70912115Sdyson case TUNSIFHEAD: 71012115Sdyson mtx_lock(&tp->tun_mtx); 71112115Sdyson if (*(int *)data) { 71212115Sdyson tp->tun_flags |= TUN_IFHEAD; 71312115Sdyson tp->tun_flags &= ~TUN_LMODE; 71412115Sdyson } else 71512115Sdyson tp->tun_flags &= ~TUN_IFHEAD; 71612115Sdyson mtx_unlock(&tp->tun_mtx); 71712115Sdyson break; 71834430Seivind case TUNGIFHEAD: 71934430Seivind mtx_lock(&tp->tun_mtx); 72034430Seivind *(int *)data = (tp->tun_flags & TUN_IFHEAD) ? 1 : 0; 72112115Sdyson mtx_unlock(&tp->tun_mtx); 72212115Sdyson break; 72312115Sdyson case TUNSIFMODE: 72412115Sdyson /* deny this if UP */ 72512115Sdyson if (TUN2IFP(tp)->if_flags & IFF_UP) 72612115Sdyson return(EBUSY); 72739671Sbde 72839671Sbde switch (*(int *)data & ~IFF_MULTICAST) { 72912115Sdyson case IFF_POINTOPOINT: 73012115Sdyson case IFF_BROADCAST: 73112115Sdyson mtx_lock(&tp->tun_mtx); 73212115Sdyson TUN2IFP(tp)->if_flags &= 73312115Sdyson ~(IFF_BROADCAST|IFF_POINTOPOINT|IFF_MULTICAST); 73412115Sdyson TUN2IFP(tp)->if_flags |= *(int *)data; 73512115Sdyson mtx_unlock(&tp->tun_mtx); 73612115Sdyson break; 73712115Sdyson default: 73812911Sphk return(EINVAL); 73912115Sdyson } 74012115Sdyson break; 74112115Sdyson case TUNSIFPID: 74212115Sdyson mtx_lock(&tp->tun_mtx); 74312115Sdyson tp->tun_pid = curthread->td_proc->p_pid; 74412115Sdyson mtx_unlock(&tp->tun_mtx); 74512115Sdyson break; 74612115Sdyson case FIONBIO: 74712115Sdyson break; 74812115Sdyson case FIOASYNC: 74912115Sdyson mtx_lock(&tp->tun_mtx); 75012115Sdyson if (*(int *)data) 75112115Sdyson tp->tun_flags |= TUN_ASYNC; 75212115Sdyson else 75312115Sdyson tp->tun_flags &= ~TUN_ASYNC; 75443301Sdillon mtx_unlock(&tp->tun_mtx); 75512115Sdyson break; 75612115Sdyson case FIONREAD: 75712115Sdyson if (!IFQ_IS_EMPTY(&TUN2IFP(tp)->if_snd)) { 75812115Sdyson struct mbuf *mb; 75939670Sbde IFQ_LOCK(&TUN2IFP(tp)->if_snd); 76039670Sbde IFQ_POLL_NOLOCK(&TUN2IFP(tp)->if_snd, mb); 76139670Sbde for (*(int *)data = 0; mb != NULL; mb = mb->m_next) 76212115Sdyson *(int *)data += mb->m_len; 76312115Sdyson IFQ_UNLOCK(&TUN2IFP(tp)->if_snd); 76427881Sdyson } else 76512115Sdyson *(int *)data = 0; 76612115Sdyson break; 76727881Sdyson case FIOSETOWN: 76839671Sbde return (fsetown(*(int *)data, &tp->tun_sigio)); 76927881Sdyson 77012115Sdyson case FIOGETOWN: 77112115Sdyson *(int *)data = fgetown(&tp->tun_sigio); 77212115Sdyson return (0); 77327881Sdyson 77427881Sdyson /* This is deprecated, FIOSETOWN should be used instead. */ 77512115Sdyson case TIOCSPGRP: 77612115Sdyson return (fsetown(-(*(int *)data), &tp->tun_sigio)); 77727881Sdyson 77812115Sdyson /* This is deprecated, FIOGETOWN should be used instead. */ 77934430Seivind case TIOCGPGRP: 78012115Sdyson *(int *)data = -fgetown(&tp->tun_sigio); 78112115Sdyson return (0); 78212115Sdyson 78312115Sdyson default: 78412115Sdyson return (ENOTTY); 78512115Sdyson } 78612115Sdyson return (0); 78712115Sdyson} 78812115Sdyson 78912115Sdyson/* 79012115Sdyson * The cdevsw read interface - reads a packet at a time, or at 79112115Sdyson * least as much of a packet as can be read. 79212115Sdyson */ 79312115Sdysonstatic int 79412911Sphktunread(struct cdev *dev, struct uio *uio, int flag) 79512115Sdyson{ 79612115Sdyson struct tun_softc *tp = dev->si_drv1; 79712115Sdyson struct ifnet *ifp = TUN2IFP(tp); 79812115Sdyson struct mbuf *m; 79912115Sdyson int error=0, len; 80012115Sdyson 80112147Sdyson TUNDEBUG (ifp, "read\n"); 80212746Sbde mtx_lock(&tp->tun_mtx); 80312746Sbde if ((tp->tun_flags & TUN_READY) != TUN_READY) { 80412746Sbde mtx_unlock(&tp->tun_mtx); 80512115Sdyson TUNDEBUG (ifp, "not ready 0%o\n", tp->tun_flags); 80612115Sdyson return (EHOSTDOWN); 80712115Sdyson } 80812115Sdyson 80943301Sdillon tp->tun_flags &= ~TUN_RWAIT; 81012115Sdyson 81112115Sdyson do { 81212115Sdyson IFQ_DEQUEUE(&ifp->if_snd, m); 81312115Sdyson if (m == NULL) { 81412115Sdyson if (flag & O_NONBLOCK) { 81512115Sdyson mtx_unlock(&tp->tun_mtx); 81612115Sdyson return (EWOULDBLOCK); 81712115Sdyson } 81812115Sdyson tp->tun_flags |= TUN_RWAIT; 81912115Sdyson error = mtx_sleep(tp, &tp->tun_mtx, PCATCH | (PZERO + 1), 82012115Sdyson "tunread", 0); 82112115Sdyson if (error != 0) { 82212115Sdyson mtx_unlock(&tp->tun_mtx); 82312115Sdyson return (error); 82412115Sdyson } 82512115Sdyson } 82612115Sdyson } while (m == NULL); 82712115Sdyson mtx_unlock(&tp->tun_mtx); 82812115Sdyson 82912115Sdyson while (m && uio->uio_resid > 0 && error == 0) { 83012911Sphk len = min(uio->uio_resid, m->m_len); 83112115Sdyson if (len != 0) 83212115Sdyson error = uiomove(mtod(m, void *), len, uio); 83312115Sdyson m = m_free(m); 83412115Sdyson } 83512115Sdyson 83612115Sdyson if (m) { 83712115Sdyson TUNDEBUG(ifp, "Dropping mbuf\n"); 83812115Sdyson m_freem(m); 83912115Sdyson } 84012115Sdyson return (error); 84112115Sdyson} 84212115Sdyson 84312115Sdyson/* 84412115Sdyson * the cdevsw write interface - an atomic write is a packet - or else! 84512115Sdyson */ 84612115Sdysonstatic int 84712115Sdysontunwrite(struct cdev *dev, struct uio *uio, int flag) 84812115Sdyson{ 84912115Sdyson struct tun_softc *tp = dev->si_drv1; 85012115Sdyson struct ifnet *ifp = TUN2IFP(tp); 85112115Sdyson struct mbuf *m; 85212115Sdyson uint32_t family; 85312115Sdyson int isr; 85412115Sdyson 85512115Sdyson TUNDEBUG(ifp, "tunwrite\n"); 85612115Sdyson 85712115Sdyson if ((ifp->if_flags & IFF_UP) != IFF_UP) 85812115Sdyson /* ignore silently */ 85912115Sdyson return (0); 86012115Sdyson 86112115Sdyson if (uio->uio_resid == 0) 86212115Sdyson return (0); 86312115Sdyson 86412115Sdyson if (uio->uio_resid < 0 || uio->uio_resid > TUNMRU) { 86512115Sdyson TUNDEBUG(ifp, "len=%zd!\n", uio->uio_resid); 86612115Sdyson return (EIO); 86712115Sdyson } 86812115Sdyson 86938909Sbde if ((m = m_uiotombuf(uio, M_NOWAIT, 0, 0, M_PKTHDR)) == NULL) { 87012115Sdyson ifp->if_ierrors++; 87112115Sdyson return (ENOBUFS); 87212115Sdyson } 87312115Sdyson 87412115Sdyson m->m_pkthdr.rcvif = ifp; 87512115Sdyson#ifdef MAC 87612115Sdyson mac_ifnet_create_mbuf(ifp, m); 87712115Sdyson#endif 87812115Sdyson 87912115Sdyson /* Could be unlocked read? */ 88012115Sdyson mtx_lock(&tp->tun_mtx); 88112115Sdyson if (tp->tun_flags & TUN_IFHEAD) { 88212115Sdyson mtx_unlock(&tp->tun_mtx); 88312115Sdyson if (m->m_len < sizeof(family) && 88412115Sdyson (m = m_pullup(m, sizeof(family))) == NULL) 88512911Sphk return (ENOBUFS); 88612115Sdyson family = ntohl(*mtod(m, u_int32_t *)); 88712115Sdyson m_adj(m, sizeof(family)); 88812115Sdyson } else { 88912115Sdyson mtx_unlock(&tp->tun_mtx); 89012115Sdyson family = AF_INET; 89112115Sdyson } 89239678Sbde 89339678Sbde BPF_MTAP2(ifp, &family, sizeof(family), m); 89439678Sbde 89539678Sbde switch (family) { 89612115Sdyson#ifdef INET 89712115Sdyson case AF_INET: 89812115Sdyson isr = NETISR_IP; 89939678Sbde break; 90039678Sbde#endif 90139678Sbde#ifdef INET6 90212115Sdyson case AF_INET6: 90312115Sdyson isr = NETISR_IPV6; 90412115Sdyson break; 90512115Sdyson#endif 90639678Sbde#ifdef IPX 90712115Sdyson case AF_IPX: 90839678Sbde isr = NETISR_IPX; 90912115Sdyson break; 91012115Sdyson#endif 91112115Sdyson#ifdef NETATALK 91212115Sdyson case AF_APPLETALK: 91312115Sdyson isr = NETISR_ATALK2; 91412115Sdyson break; 91539678Sbde#endif 91639678Sbde default: 91712115Sdyson m_freem(m); 91839678Sbde return (EAFNOSUPPORT); 91943309Sdillon } 92012115Sdyson if (harvest.point_to_point) 92143395Sbde random_harvest(&(m->m_data), 12, 3, 0, RANDOM_NET_TUN); 92239678Sbde ifp->if_ibytes += m->m_pkthdr.len; 92312115Sdyson ifp->if_ipackets++; 92439678Sbde CURVNET_SET(ifp->if_vnet); 92539678Sbde M_SETFIB(m, ifp->if_fib); 92639678Sbde netisr_dispatch(isr, m); 92739678Sbde CURVNET_RESTORE(); 92839678Sbde return (0); 92939678Sbde} 93039678Sbde 93139678Sbde/* 93239678Sbde * tunpoll - the poll interface, this is only useful on reads 93343301Sdillon * really. The write detect always returns true, write never blocks 93412115Sdyson * anyway, it either accepts the packet or drops it. 93539678Sbde */ 93639678Sbdestatic int 93739678Sbdetunpoll(struct cdev *dev, int events, struct thread *td) 93812115Sdyson{ 93939678Sbde struct tun_softc *tp = dev->si_drv1; 94012115Sdyson struct ifnet *ifp = TUN2IFP(tp); 94112115Sdyson int revents = 0; 94212115Sdyson struct mbuf *m; 94339678Sbde 94439678Sbde TUNDEBUG(ifp, "tunpoll\n"); 94539678Sbde 94639678Sbde if (events & (POLLIN | POLLRDNORM)) { 94739678Sbde IFQ_LOCK(&ifp->if_snd); 94839678Sbde IFQ_POLL_NOLOCK(&ifp->if_snd, m); 94912115Sdyson if (m != NULL) { 95012115Sdyson TUNDEBUG(ifp, "tunpoll q=%d\n", ifp->if_snd.ifq_len); 95112115Sdyson revents |= events & (POLLIN | POLLRDNORM); 95239678Sbde } else { 95339678Sbde TUNDEBUG(ifp, "tunpoll waiting\n"); 95439678Sbde selrecord(td, &tp->tun_rsel); 95539678Sbde } 95639678Sbde IFQ_UNLOCK(&ifp->if_snd); 95739678Sbde } 95839678Sbde if (events & (POLLOUT | POLLWRNORM)) 95939678Sbde revents |= events & (POLLOUT | POLLWRNORM); 96039678Sbde 96112115Sdyson return (revents); 96212115Sdyson} 96312115Sdyson 96412115Sdyson/* 96512115Sdyson * tunkqfilter - support for the kevent() system call. 96612115Sdyson */ 96712115Sdysonstatic int 96812115Sdysontunkqfilter(struct cdev *dev, struct knote *kn) 96912115Sdyson{ 97012911Sphk struct tun_softc *tp = dev->si_drv1; 97112115Sdyson struct ifnet *ifp = TUN2IFP(tp); 97212115Sdyson 97312115Sdyson switch(kn->kn_filter) { 97412115Sdyson case EVFILT_READ: 97512115Sdyson TUNDEBUG(ifp, "%s kqfilter: EVFILT_READ, minor = %#x\n", 97612115Sdyson ifp->if_xname, dev2unit(dev)); 97712115Sdyson kn->kn_fop = &tun_read_filterops; 97812115Sdyson break; 97912115Sdyson 98012115Sdyson case EVFILT_WRITE: 98112115Sdyson TUNDEBUG(ifp, "%s kqfilter: EVFILT_WRITE, minor = %#x\n", 98230280Sphk ifp->if_xname, dev2unit(dev)); 98312115Sdyson kn->kn_fop = &tun_write_filterops; 98412115Sdyson break; 98512115Sdyson 98612115Sdyson default: 98712406Sdyson TUNDEBUG(ifp, "%s kqfilter: invalid filter, minor = %#x\n", 98812115Sdyson ifp->if_xname, dev2unit(dev)); 98912115Sdyson return(EINVAL); 99012115Sdyson } 99112406Sdyson 99212406Sdyson kn->kn_hook = tp; 99312406Sdyson knlist_add(&tp->tun_rsel.si_note, kn, 0); 99412406Sdyson 99512406Sdyson return (0); 99612406Sdyson} 99712406Sdyson 99812406Sdyson/* 99936102Sbde * Return true of there is data in the interface queue. 100012406Sdyson */ 100112406Sdysonstatic int 100212406Sdysontunkqread(struct knote *kn, long hint) 100312406Sdyson{ 100412406Sdyson int ret; 100536102Sbde struct tun_softc *tp = kn->kn_hook; 100636102Sbde struct cdev *dev = tp->tun_dev; 100736102Sbde struct ifnet *ifp = TUN2IFP(tp); 100836102Sbde 100936102Sbde if ((kn->kn_data = ifp->if_snd.ifq_len) > 0) { 101036102Sbde TUNDEBUG(ifp, 101136102Sbde "%s have data in the queue. Len = %d, minor = %#x\n", 101236102Sbde ifp->if_xname, ifp->if_snd.ifq_len, dev2unit(dev)); 101336102Sbde ret = 1; 101412115Sdyson } else { 101543301Sdillon TUNDEBUG(ifp, 101636102Sbde "%s waiting for data, minor = %#x\n", ifp->if_xname, 101736102Sbde dev2unit(dev)); 101836102Sbde ret = 0; 101912115Sdyson } 102036102Sbde 102112115Sdyson return (ret); 102212115Sdyson} 102312115Sdyson 102438998Sbde/* 102512115Sdyson * Always can write, always return MTU in kn->data. 102612115Sdyson */ 102712115Sdysonstatic int 102812115Sdysontunkqwrite(struct knote *kn, long hint) 102912115Sdyson{ 103012115Sdyson struct tun_softc *tp = kn->kn_hook; 103112115Sdyson struct ifnet *ifp = TUN2IFP(tp); 103212115Sdyson 103312115Sdyson kn->kn_data = ifp->if_mtu; 103412115Sdyson 103512115Sdyson return (1); 103612115Sdyson} 103712115Sdyson 103812115Sdysonstatic void 103912115Sdysontunkqdetach(struct knote *kn) 104012115Sdyson{ 104112115Sdyson struct tun_softc *tp = kn->kn_hook; 104212406Sdyson 104312406Sdyson knlist_remove(&tp->tun_rsel.si_note, kn, 0); 104412406Sdyson} 104512406Sdyson