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Remove hack used to deal with ifnet teardown now that if_detach and the

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bridge do a better job.
o move ether_ifdetach to the top of ieee80211_detach
o do not clear if_softc at the top of ieee80211_detach; we no longer need
  this because we are safeguarded against calls coming back through if_ioctl
o simplify the bpf tracker now that we don't null if_softc

This also fixes an issue where having a bpf consumer active when a vap
is destroyed would cause a crash because bpf referenced free'd memory.

Reviewed by:	imp
This commit is contained in:
Sam Leffler 2009-06-02 16:57:27 +00:00
parent 869c7348e5
commit 1da89db5d6
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=193312
3 changed files with 8 additions and 42 deletions
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26
sys/net80211/ieee80211.c
View File

@ -544,24 +544,10 @@ ieee80211_vap_detach(struct ieee80211vap *vap)
__func__, ieee80211_opmode_name[vap->iv_opmode],
ic->ic_ifp->if_xname);
IEEE80211_LOCK(ic);
/* block traffic from above */
ifp->if_drv_flags |= IFF_DRV_OACTIVE;
/*
* Evil hack. Clear the backpointer from the ifnet to the
* vap so any requests from above will return an error or
* be ignored. In particular this short-circuits requests
* by the bridge to turn off promiscuous mode as a result
* of calling ether_ifdetach.
*/
ifp->if_softc = NULL;
/*
* Stop the vap before detaching the ifnet. Ideally we'd
* do this in the other order so the ifnet is inaccessible
* while we cleanup internal state but that is hard.
*/
ieee80211_stop_locked(vap);
IEEE80211_UNLOCK(ic);
/* NB: bpfdetach is called by ether_ifdetach and claims all taps */
ether_ifdetach(ifp);
ieee80211_stop(vap);
/*
* Flush any deferred vap tasks.
@ -587,10 +573,6 @@ ieee80211_vap_detach(struct ieee80211vap *vap)
ieee80211_syncifflag_locked(ic, IFF_ALLMULTI);
IEEE80211_UNLOCK(ic);
/* XXX can't hold com lock */
/* NB: bpfdetach is called by ether_ifdetach and claims all taps */
ether_ifdetach(ifp);
ifmedia_removeall(&vap->iv_media);
ieee80211_radiotap_vdetach(vap);

3
sys/net80211/ieee80211_freebsd.c
View File

@ -710,8 +710,7 @@ bpf_track(void *arg, struct ifnet *ifp, int dlt, int attach)
ieee80211_syncflag_ext(vap, IEEE80211_FEXT_BPF);
if (vap->iv_opmode == IEEE80211_M_MONITOR)
atomic_add_int(&vap->iv_ic->ic_montaps, 1);
/* NB: if_softc is NULL on vap detach */
} else if (vap != NULL && !bpf_peers_present(vap->iv_rawbpf)) {
} else if (!bpf_peers_present(vap->iv_rawbpf)) {
ieee80211_syncflag_ext(vap, -IEEE80211_FEXT_BPF);
if (vap->iv_opmode == IEEE80211_M_MONITOR)
atomic_subtract_int(&vap->iv_ic->ic_montaps, 1);

21
sys/net80211/ieee80211_ioctl.c
View File

@ -3202,29 +3202,14 @@ ieee80211_ioctl_updatemulti(struct ieee80211com *ic)
int
ieee80211_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
struct ieee80211vap *vap;
struct ieee80211com *ic;
struct ieee80211vap *vap = ifp->if_softc;
struct ieee80211com *ic = vap->iv_ic;
int error = 0;
struct ifreq *ifr;
struct ifaddr *ifa; /* XXX */
vap = ifp->if_softc;
if (vap == NULL) {
/*
* During detach we clear the backpointer in the softc
* so any ioctl request through the ifnet that arrives
* before teardown is ignored/rejected. In particular
* this hack handles destroying a vap used by an app
* like wpa_supplicant that will respond to the vap
* being forced into INIT state by immediately trying
* to force it back up. We can yank this hack if/when
* we can destroy the ifnet before cleaning up vap state.
*/
return ENXIO;
}
switch (cmd) {
case SIOCSIFFLAGS:
ic = vap->iv_ic;
IEEE80211_LOCK(ic);
ieee80211_syncifflag_locked(ic, IFF_PROMISC);
ieee80211_syncifflag_locked(ic, IFF_ALLMULTI);
@ -3250,7 +3235,7 @@ ieee80211_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
ieee80211_ioctl_updatemulti(vap->iv_ic);
ieee80211_ioctl_updatemulti(ic);
break;
case SIOCSIFMEDIA:
case SIOCGIFMEDIA: