diff options
Diffstat (limited to 'sys/net80211/ieee80211_freebsd.c')
| -rw-r--r-- | sys/net80211/ieee80211_freebsd.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/sys/net80211/ieee80211_freebsd.c b/sys/net80211/ieee80211_freebsd.c index e96e71d..89292a6 100644 --- a/sys/net80211/ieee80211_freebsd.c +++ b/sys/net80211/ieee80211_freebsd.c @@ -43,6 +43,7 @@ __FBSDID("$FreeBSD$"); #include <sys/socket.h> #include <sys/vimage.h> +#include <net/bpf.h> #include <net/if.h> #include <net/if_dl.h> #include <net/if_clone.h> @@ -726,6 +727,29 @@ ieee80211_load_module(const char *modname) #endif } +static eventhandler_tag wlan_bpfevent; + +static void +bpf_track(void *arg, struct ifnet *ifp, int attach) +{ + /* NB: identify vap's by if_start */ + if (ifp->if_start == ieee80211_start) { + struct ieee80211vap *vap = ifp->if_softc; + /* + * Track bpf radiotap listener state. We mark the vap + * to indicate if any listener is present and the com + * to indicate if any listener exists on any associated + * vap. This flag is used by drivers to prepare radiotap + * state only when needed. + */ + if (attach) + ieee80211_syncflag_ext(vap, IEEE80211_FEXT_BPF); + /* NB: if_softc is NULL on vap detach */ + else if (vap != NULL && !bpf_peers_present(vap->iv_rawbpf)) + ieee80211_syncflag_ext(vap, -IEEE80211_FEXT_BPF); + } +} + /* * Module glue. * @@ -738,12 +762,17 @@ wlan_modevent(module_t mod, int type, void *unused) case MOD_LOAD: if (bootverbose) printf("wlan: <802.11 Link Layer>\n"); + wlan_bpfevent = EVENTHANDLER_REGISTER(bpf_track, + bpf_track, 0, EVENTHANDLER_PRI_ANY); + if (wlan_bpfevent == NULL) + return ENOMEM; if_clone_attach(&wlan_cloner); if_register_com_alloc(IFT_IEEE80211, wlan_alloc, wlan_free); return 0; case MOD_UNLOAD: if_deregister_com_alloc(IFT_IEEE80211); if_clone_detach(&wlan_cloner); + EVENTHANDLER_DEREGISTER(bpf_track, wlan_bpfevent); return 0; } return EINVAL; |
