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Add ieee80211_beacon_miss for processing sta mode beacon miss events

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in the 802.11 layer: we send a directed probe request frame to the
current ap bmiss_max times (w/o answer) before scanning for a new ap.

MFC after:	2 weeks
This commit is contained in:
Sam Leffler 2005-12-12 18:04:44 +00:00
parent 047f1635dd
commit e701e041f2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=153349
5 changed files with 47 additions and 0 deletions
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3
sys/net80211/ieee80211_freebsd.c
View File

@ -126,6 +126,9 @@ ieee80211_sysctl_attach(struct ieee80211com *ic)
SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
"driver_caps", CTLFLAG_RW, &ic->ic_caps, 0,
"driver capabilities");
SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
"bmiss_max", CTLFLAG_RW, &ic->ic_bmiss_max, 0,
"consecutive beacon misses before scanning");
ic->ic_sysctl = ctx;
}

1
sys/net80211/ieee80211_input.c
View File

@ -1942,6 +1942,7 @@ ieee80211_recv_mgmt(struct ieee80211com *ic, struct mbuf *m0,
if (ic->ic_flags & IEEE80211_F_SCAN)
ieee80211_add_scan(ic, &scan, wh,
subtype, rssi, rstamp);
ic->ic_bmiss_count = 0;
return;
}
/*

38
sys/net80211/ieee80211_proto.c
View File

@ -97,6 +97,7 @@ ieee80211_proto_attach(struct ieee80211com *ic)
ic->ic_rtsthreshold = IEEE80211_RTS_DEFAULT;
ic->ic_fragthreshold = IEEE80211_FRAG_DEFAULT;
ic->ic_fixed_rate = IEEE80211_FIXED_RATE_NONE;
ic->ic_bmiss_max = IEEE80211_BMISS_MAX;
ic->ic_mcast_rate = IEEE80211_MCAST_RATE_DEFAULT;
ic->ic_protmode = IEEE80211_PROT_CTSONLY;
ic->ic_roaming = IEEE80211_ROAMING_AUTO;
@ -817,6 +818,43 @@ ieee80211_wme_updateparams(struct ieee80211com *ic)
}
}
void
ieee80211_beacon_miss(struct ieee80211com *ic)
{
if (ic->ic_flags & IEEE80211_F_SCAN) {
/* XXX check ic_curchan != ic_bsschan? */
return;
}
IEEE80211_DPRINTF(ic,
IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
"%s\n", "beacon miss");
/*
* Our handling is only meaningful for stations that are
* associated; any other conditions else will be handled
* through different means (e.g. the tx timeout on mgt frames).
*/
if (ic->ic_opmode != IEEE80211_M_STA || ic->ic_state != IEEE80211_S_RUN)
return;
if (++ic->ic_bmiss_count < ic->ic_bmiss_max) {
/*
* Send a directed probe req before falling back to a scan;
* if we receive a response ic_bmiss_count will be reset.
* Some cards mistakenly report beacon miss so this avoids
* the expensive scan if the ap is still there.
*/
ieee80211_send_probereq(ic->ic_bss, ic->ic_myaddr,
ic->ic_bss->ni_bssid, ic->ic_bss->ni_bssid,
ic->ic_bss->ni_essid, ic->ic_bss->ni_esslen,
ic->ic_opt_ie, ic->ic_opt_ie_len);
return;
}
ic->ic_bmiss_count = 0;
ieee80211_new_state(ic, IEEE80211_S_SCAN, 0);
}
static void
sta_disassoc(void *arg, struct ieee80211_node *ni)
{

1
sys/net80211/ieee80211_proto.h
View File

@ -218,6 +218,7 @@ void ieee80211_wme_updateparams_locked(struct ieee80211com *);
#define ieee80211_new_state(_ic, _nstate, _arg) \
(((_ic)->ic_newstate)((_ic), (_nstate), (_arg)))
void ieee80211_beacon_miss(struct ieee80211com *);
void ieee80211_print_essid(const u_int8_t *, int);
void ieee80211_dump_pkt(const u_int8_t *, int, int, int);

4
sys/net80211/ieee80211_var.h
View File

@ -70,6 +70,8 @@
#define IEEE80211_BINTVAL_MIN 25 /* min beacon interval (TU's) */
#define IEEE80211_BINTVAL_DEFAULT 100 /* default beacon interval (TU's) */
#define IEEE80211_BMISS_MAX 2 /* maximum consecutive bmiss allowed */
#define IEEE80211_PS_SLEEP 0x1 /* STA is in power saving mode */
#define IEEE80211_PS_MAX_QUEUE 50 /* maximum saved packets */
@ -142,6 +144,8 @@ struct ieee80211com {
int ic_mcast_rate; /* rate for mcast frames */
u_int16_t ic_rtsthreshold;
u_int16_t ic_fragthreshold;
u_int8_t ic_bmiss_count; /* current beacon miss count */
int ic_bmiss_max; /* max bmiss before scan */
struct ieee80211_node *(*ic_node_alloc)(struct ieee80211_node_table*);
void (*ic_node_free)(struct ieee80211_node *);
void (*ic_node_cleanup)(struct ieee80211_node *);