diff options
Diffstat (limited to 'sys/net')
| -rw-r--r-- | sys/net/if_tuntap.c | 63 | ||||
| -rw-r--r-- | sys/net/pfvar.h | 9 |
2 files changed, 64 insertions, 8 deletions
diff --git a/sys/net/if_tuntap.c b/sys/net/if_tuntap.c index 56bb90cce9bc..0dc3a58f6ae6 100644 --- a/sys/net/if_tuntap.c +++ b/sys/net/if_tuntap.c @@ -138,6 +138,7 @@ struct tuntap_softc { #define TUN_READY (TUN_OPEN | TUN_INITED) pid_t tun_pid; /* owning pid */ + struct epoch_context tun_epoch_ctx; struct ifnet *tun_ifp; /* the interface */ struct sigio *tun_sigio; /* async I/O info */ struct tuntap_driver *tun_drv; /* appropriate driver */ @@ -630,6 +631,18 @@ out: CURVNET_RESTORE(); } +static void +tunfree(struct epoch_context *ctx) +{ + struct tuntap_softc *tp; + + tp = __containerof(ctx, struct tuntap_softc, tun_epoch_ctx); + + /* Any remaining resources that would be needed by a concurrent open. */ + mtx_destroy(&tp->tun_mtx); + free(tp, M_TUN); +} + static int tun_destroy(struct tuntap_softc *tp, bool may_intr) { @@ -649,7 +662,7 @@ tun_destroy(struct tuntap_softc *tp, bool may_intr) error = cv_wait_sig(&tp->tun_cv, &tp->tun_mtx); else cv_wait(&tp->tun_cv, &tp->tun_mtx); - if (error != 0) { + if (error != 0 && tp->tun_busy != 0) { tp->tun_flags &= ~TUN_DYING; TUN_UNLOCK(tp); return (error); @@ -663,8 +676,18 @@ tun_destroy(struct tuntap_softc *tp, bool may_intr) TAILQ_REMOVE(&tunhead, tp, tun_list); mtx_unlock(&tunmtx); - /* destroy_dev will take care of any alias. */ - destroy_dev(tp->tun_dev); + /* + * destroy_dev will take care of any alias. For transient tunnels, + * we're being called from close(2) so we can't destroy it ourselves + * without deadlocking, but we already know that we can cleanup + * everything else and just continue to prevent it from being reopened. + */ + if ((tp->tun_flags & TUN_TRANSIENT) != 0) { + atomic_store_ptr(&tp->tun_dev->si_drv1, tp->tun_dev); + destroy_dev_sched(tp->tun_dev); + } else { + destroy_dev(tp->tun_dev); + } seldrain(&tp->tun_rsel); knlist_clear(&tp->tun_rsel.si_note, 0); knlist_destroy(&tp->tun_rsel.si_note); @@ -679,9 +702,8 @@ tun_destroy(struct tuntap_softc *tp, bool may_intr) 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); + NET_EPOCH_CALL(tunfree, &tp->tun_epoch_ctx); CURVNET_RESTORE(); return (0); @@ -742,9 +764,11 @@ tun_uninit(const void *unused __unused) mtx_unlock(&tunmtx); for (i = 0; i < nitems(tuntap_drivers); ++i) { drv = &tuntap_drivers[i]; + destroy_dev_drain(&drv->cdevsw); delete_unrhdr(drv->unrhdr); clone_cleanup(&drv->clones); } + NET_EPOCH_DRAIN_CALLBACKS(); mtx_destroy(&tunmtx); } SYSUNINIT(tun_uninit, SI_SUB_PROTO_IF, SI_ORDER_ANY, tun_uninit, NULL); @@ -1104,19 +1128,43 @@ out: static int tunopen(struct cdev *dev, int flag, int mode, struct thread *td) { + struct epoch_tracker et; struct ifnet *ifp; struct tuntap_softc *tp; + void *p; int error __diagused, tunflags; + /* + * Transient tunnels do deferred destroy of the tun device but want + * to immediately cleanup state, so they clobber si_drv1 to avoid a + * use-after-free in case someone does happen to open it in the interim. + * We avoid using NULL to be able to distinguish from an uninitialized + * cdev. + * + * We use the net epoch here to let a concurrent tun_destroy() schedule + * freeing our tuntap_softc, in case we entered here and loaded si_drv1 + * before it was swapped out. If we managed to load this while it was + * still a softc, then the concurrent tun_destroy() hasn't yet scheduled + * it to be free- that will take place sometime after the epoch we just + * entered, so we can safely use it. + */ + NET_EPOCH_ENTER(et); + p = atomic_load_ptr(&dev->si_drv1); + if (p == dev) { + NET_EPOCH_EXIT(et); + return (ENXIO); + } + tunflags = 0; CURVNET_SET(TD_TO_VNET(td)); error = tuntap_name2info(dev->si_name, NULL, &tunflags); if (error != 0) { CURVNET_RESTORE(); + NET_EPOCH_EXIT(et); return (error); /* Shouldn't happen */ } - tp = dev->si_drv1; + tp = p; KASSERT(tp != NULL, ("si_drv1 should have been initialized at creation")); @@ -1124,14 +1172,17 @@ tunopen(struct cdev *dev, int flag, int mode, struct thread *td) if ((tp->tun_flags & TUN_INITED) == 0) { TUN_UNLOCK(tp); CURVNET_RESTORE(); + NET_EPOCH_EXIT(et); return (ENXIO); } if ((tp->tun_flags & (TUN_OPEN | TUN_DYING)) != 0) { TUN_UNLOCK(tp); CURVNET_RESTORE(); + NET_EPOCH_EXIT(et); return (EBUSY); } + NET_EPOCH_EXIT(et); error = tun_busy_locked(tp); KASSERT(error == 0, ("Must be able to busy an unopen tunnel")); ifp = TUN2IFP(tp); diff --git a/sys/net/pfvar.h b/sys/net/pfvar.h index 8aefe514946e..ce266a267f3c 100644 --- a/sys/net/pfvar.h +++ b/sys/net/pfvar.h @@ -2038,14 +2038,15 @@ struct pfioc_trans { } *array; }; -#define PFR_FLAG_ATOMIC 0x00000001 /* unused */ +#define PFR_FLAG_START 0x00000001 #define PFR_FLAG_DUMMY 0x00000002 #define PFR_FLAG_FEEDBACK 0x00000004 #define PFR_FLAG_CLSTATS 0x00000008 #define PFR_FLAG_ADDRSTOO 0x00000010 #define PFR_FLAG_REPLACE 0x00000020 #define PFR_FLAG_ALLRSETS 0x00000040 -#define PFR_FLAG_ALLMASK 0x0000007F +#define PFR_FLAG_DONE 0x00000080 +#define PFR_FLAG_ALLMASK 0x000000FF #ifdef _KERNEL #define PFR_FLAG_USERIOCTL 0x10000000 #endif @@ -2435,6 +2436,7 @@ extern struct pf_ksrc_node *pf_find_src_node(struct pf_addr *, struct pf_srchash **, pf_sn_types_t, bool); extern void pf_unlink_src_node(struct pf_ksrc_node *); extern u_int pf_free_src_nodes(struct pf_ksrc_node_list *); +extern void pf_free_src_node(struct pf_ksrc_node *); extern void pf_print_state(struct pf_kstate *); extern void pf_print_flags(uint16_t); extern int pf_addr_wrap_neq(struct pf_addr_wrap *, @@ -2521,6 +2523,9 @@ uint16_t pf_qname2qid(const char *, bool); void pfr_initialize(void); void pfr_cleanup(void); +struct pfr_kentry * + pfr_kentry_byaddr(struct pfr_ktable *, struct pf_addr *, sa_family_t, + int); int pfr_match_addr(struct pfr_ktable *, struct pf_addr *, sa_family_t); void pfr_update_stats(struct pfr_ktable *, struct pf_addr *, sa_family_t, u_int64_t, int, int, int); |