/* $OpenBSD: ieee80211_node.c,v 1.28 2007/07/06 18:18:43 damien Exp $ */
/* $NetBSD: ieee80211_node.c,v 1.14 2004/05/09 09:18:47 dyoung Exp $ */
/*-
* Copyright (c) 2001 Atsushi Onoe
* Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "bpfilter.h"
#include "bridge.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/endian.h>
#include <sys/errno.h>
#include <sys/proc.h>
#include <sys/sysctl.h>
#include <sys/tree.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/if_arp.h>
#include <net/if_llc.h>
#if NBPFILTER > 0
#include <net/bpf.h>
#endif
#ifdef INET
#include <netinet/in.h>
#include <netinet/if_ether.h>
#endif
#if NBRIDGE > 0
#include <net/if_bridge.h>
#endif
#include <net80211/ieee80211_var.h>
#include <dev/rndvar.h>
struct ieee80211_node *ieee80211_node_alloc(struct ieee80211com *);
void ieee80211_node_free(struct ieee80211com *, struct ieee80211_node *);
void ieee80211_node_copy(struct ieee80211com *, struct ieee80211_node *,
const struct ieee80211_node *);
u_int8_t ieee80211_node_getrssi(struct ieee80211com *,
const struct ieee80211_node *);
void ieee80211_setup_node(struct ieee80211com *, struct ieee80211_node *,
const u_int8_t *);
void ieee80211_free_node(struct ieee80211com *, struct ieee80211_node *);
struct ieee80211_node *ieee80211_alloc_node_helper(struct ieee80211com *);
void ieee80211_node_cleanup(struct ieee80211com *, struct ieee80211_node *);
void ieee80211_node_join_11g(struct ieee80211com *, struct ieee80211_node *);
void ieee80211_node_leave_11g(struct ieee80211com *, struct ieee80211_node *);
void ieee80211_set_tim(struct ieee80211com *, int, int);
#define M_80211_NODE M_DEVBUF
void
ieee80211_node_attach(struct ifnet *ifp)
{
struct ieee80211com *ic = (void *)ifp;
int size;
RB_INIT(&ic->ic_tree);
ic->ic_node_alloc = ieee80211_node_alloc;
ic->ic_node_free = ieee80211_node_free;
ic->ic_node_copy = ieee80211_node_copy;
ic->ic_node_getrssi = ieee80211_node_getrssi;
ic->ic_scangen = 1;
ic->ic_max_nnodes = ieee80211_cache_size;
if (ic->ic_max_aid == 0)
ic->ic_max_aid = IEEE80211_AID_DEF;
else if (ic->ic_max_aid > IEEE80211_AID_MAX)
ic->ic_max_aid = IEEE80211_AID_MAX;
size = howmany(ic->ic_max_aid, 32) * sizeof(u_int32_t);
MALLOC(ic->ic_aid_bitmap, u_int32_t *, size, M_DEVBUF, M_NOWAIT);
if (ic->ic_aid_bitmap == NULL) {
/* XXX no way to recover */
printf("%s: no memory for AID bitmap!\n", __func__);
ic->ic_max_aid = 0;
} else
memset(ic->ic_aid_bitmap, 0, size);
if (ic->ic_caps & (IEEE80211_C_HOSTAP | IEEE80211_C_IBSS)) {
ic->ic_tim_len = howmany(ic->ic_max_aid, 8);
MALLOC(ic->ic_tim_bitmap, u_int8_t *, ic->ic_tim_len, M_DEVBUF,
M_NOWAIT);
if (ic->ic_tim_bitmap == NULL) {
printf("%s: no memory for TIM bitmap!\n", __func__);
ic->ic_tim_len = 0;
} else {
memset(ic->ic_tim_bitmap, 0, ic->ic_tim_len);
ic->ic_set_tim = ieee80211_set_tim;
}
}
}
struct ieee80211_node *
ieee80211_alloc_node_helper(struct ieee80211com *ic)
{
struct ieee80211_node *ni;
if (ic->ic_nnodes >= ic->ic_max_nnodes)
ieee80211_clean_nodes(ic);
if (ic->ic_nnodes >= ic->ic_max_nnodes)
return NULL;
ni = (*ic->ic_node_alloc)(ic);
if (ni != NULL)
ic->ic_nnodes++;
return ni;
}
void
ieee80211_node_lateattach(struct ifnet *ifp)
{
struct ieee80211com *ic = (void *)ifp;
struct ieee80211_node *ni;
ni = ieee80211_alloc_node_helper(ic);
if (ni == NULL)
panic("unable to setup inital BSS node");
ni->ni_chan = IEEE80211_CHAN_ANYC;
ic->ic_bss = ieee80211_ref_node(ni);
ic->ic_txpower = IEEE80211_TXPOWER_MAX;
}
void
ieee80211_node_detach(struct ifnet *ifp)
{
struct ieee80211com *ic = (void *)ifp;
if (ic->ic_bss != NULL) {
(*ic->ic_node_free)(ic, ic->ic_bss);
ic->ic_bss = NULL;
}
ieee80211_free_allnodes(ic);
if (ic->ic_aid_bitmap != NULL)
FREE(ic->ic_aid_bitmap, M_DEVBUF);
if (ic->ic_tim_bitmap != NULL)
FREE(ic->ic_tim_bitmap, M_DEVBUF);
}
/*
* AP scanning support.
*/
/*
* Initialize the active channel set based on the set
* of available channels and the current PHY mode.
*/
void
ieee80211_reset_scan(struct ifnet *ifp)
{
struct ieee80211com *ic = (void *)ifp;
memcpy(ic->ic_chan_scan, ic->ic_chan_active,
sizeof(ic->ic_chan_active));
/* NB: hack, setup so next_scan starts with the first channel */
if (ic->ic_bss != NULL && ic->ic_bss->ni_chan == IEEE80211_CHAN_ANYC)
ic->ic_bss->ni_chan = &ic->ic_channels[IEEE80211_CHAN_MAX];
}
/*
* Begin an active scan.
*/
void
ieee80211_begin_scan(struct ifnet *ifp)
{
struct ieee80211com *ic = (void *)ifp;
if (ic->ic_scan_lock & IEEE80211_SCAN_LOCKED)
return;
ic->ic_scan_lock |= IEEE80211_SCAN_LOCKED;
/*
* In all but hostap mode scanning starts off in
* an active mode before switching to passive.
*/
if (ic->ic_opmode != IEEE80211_M_HOSTAP) {
ic->ic_flags |= IEEE80211_F_ASCAN;
ic->ic_stats.is_scan_active++;
} else
ic->ic_stats.is_scan_passive++;
if (ifp->if_flags & IFF_DEBUG)
printf("%s: begin %s scan\n", ifp->if_xname,
(ic->ic_flags & IEEE80211_F_ASCAN) ?
"active" : "passive");
/*
* Flush any previously seen AP's. Note that the latter
* assumes we don't act as both an AP and a station,
* otherwise we'll potentially flush state of stations
* associated with us.
*/
ieee80211_free_allnodes(ic);
/*
* Reset the current mode. Setting the current mode will also
* reset scan state.
*/
if (IFM_MODE(ic->ic_media.ifm_cur->ifm_media) == IFM_AUTO)
ic->ic_curmode = IEEE80211_MODE_AUTO;
ieee80211_setmode(ic, ic->ic_curmode);
ic->ic_scan_count = 0;
/* Scan the next channel. */
ieee80211_next_scan(ifp);
}
/*
* Switch to the next channel marked for scanning.
*/
void
ieee80211_next_scan(struct ifnet *ifp)
{
struct ieee80211com *ic = (void *)ifp;
struct ieee80211_channel *chan;
chan = ic->ic_bss->ni_chan;
for (;;) {
if (++chan > &ic->ic_channels[IEEE80211_CHAN_MAX])
chan = &ic->ic_channels[0];
if (isset(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan))) {
/*
* Ignore channels marked passive-only
* during an active scan.
*/
if ((ic->ic_flags & IEEE80211_F_ASCAN) == 0 ||
(chan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0)
break;
}
if (chan == ic->ic_bss->ni_chan) {
ieee80211_end_scan(ifp);
return;
}
}
clrbit(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan));
IEEE80211_DPRINTF(("%s: chan %d->%d\n", __func__,
ieee80211_chan2ieee(ic, ic->ic_bss->ni_chan),
ieee80211_chan2ieee(ic, chan)));
ic->ic_bss->ni_chan = chan;
ieee80211_new_state(ic, IEEE80211_S_SCAN, -1);
}
void
ieee80211_create_ibss(struct ieee80211com* ic, struct ieee80211_channel *chan)
{
struct ieee80211_node *ni;
struct ifnet *ifp = &ic->ic_if;
ni = ic->ic_bss;
if (ifp->if_flags & IFF_DEBUG)
printf("%s: creating ibss\n", ifp->if_xname);
ic->ic_flags |= IEEE80211_F_SIBSS;
ni->ni_chan = chan;
ni->ni_rates = ic->ic_sup_rates[ieee80211_chan2mode(ic, ni->ni_chan)];
IEEE80211_ADDR_COPY(ni->ni_macaddr, ic->ic_myaddr);
IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_myaddr);
if (ic->ic_opmode == IEEE80211_M_IBSS) {
if ((ic->ic_flags & IEEE80211_F_DESBSSID) != 0)
IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_des_bssid);
else
ni->ni_bssid[0] |= 0x02; /* local bit for IBSS */
}
ni->ni_esslen = ic->ic_des_esslen;
memcpy(ni->ni_essid, ic->ic_des_essid, ni->ni_esslen);
ni->ni_rssi = 0;
ni->ni_rstamp = 0;
memset(ni->ni_tstamp, 0, sizeof(ni->ni_tstamp));
ni->ni_intval = ic->ic_lintval;
ni->ni_capinfo = IEEE80211_CAPINFO_IBSS;
if (ic->ic_flags & IEEE80211_F_WEPON)
ni->ni_capinfo |= IEEE80211_CAPINFO_PRIVACY;
if (ic->ic_phytype == IEEE80211_T_FH) {
ni->ni_fhdwell = 200; /* XXX */
ni->ni_fhindex = 1;
}
ieee80211_new_state(ic, IEEE80211_S_RUN, -1);
}
int
ieee80211_match_bss(struct ieee80211com *ic, struct ieee80211_node *ni)
{
u_int8_t rate;
int fail;
fail = 0;
if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan)))
fail |= 0x01;
if (ic->ic_des_chan != IEEE80211_CHAN_ANYC &&
ni->ni_chan != ic->ic_des_chan)
fail |= 0x01;
if (ic->ic_opmode == IEEE80211_M_IBSS) {
if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0)
fail |= 0x02;
} else {
if ((ni->ni_capinfo & IEEE80211_CAPINFO_ESS) == 0)
fail |= 0x02;
}
if (ic->ic_flags & IEEE80211_F_WEPON) {
if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0)
fail |= 0x04;
} else {
/* XXX does this mean privacy is supported or required? */
if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY)
fail |= 0x04;
}
rate = ieee80211_fix_rate(ic, ni, IEEE80211_F_DONEGO);
if (rate & IEEE80211_RATE_BASIC)
fail |= 0x08;
if (ic->ic_des_esslen != 0 &&
(ni->ni_esslen != ic->ic_des_esslen ||
memcmp(ni->ni_essid, ic->ic_des_essid, ic->ic_des_esslen) != 0))
fail |= 0x10;
if ((ic->ic_flags & IEEE80211_F_DESBSSID) &&
!IEEE80211_ADDR_EQ(ic->ic_des_bssid, ni->ni_bssid))
fail |= 0x20;
#ifdef IEEE80211_DEBUG
if (ic->ic_if.if_flags & IFF_DEBUG) {
printf(" %c %s", fail ? '-' : '+',
ether_sprintf(ni->ni_macaddr));
printf(" %s%c", ether_sprintf(ni->ni_bssid),
fail & 0x20 ? '!' : ' ');
printf(" %3d%c", ieee80211_chan2ieee(ic, ni->ni_chan),
fail & 0x01 ? '!' : ' ');
printf(" %+4d", ni->ni_rssi);
printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2,
fail & 0x08 ? '!' : ' ');
printf(" %4s%c",
(ni->ni_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" :
(ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" :
"????",
fail & 0x02 ? '!' : ' ');
printf(" %3s%c ",
(ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) ?
"wep" : "no",
fail & 0x04 ? '!' : ' ');
ieee80211_print_essid(ni->ni_essid, ni->ni_esslen);
printf("%s\n", fail & 0x10 ? "!" : "");
}
#endif
return fail;
}
/*
* Complete a scan of potential channels.
*/
void
ieee80211_end_scan(struct ifnet *ifp)
{
struct ieee80211com *ic = (void *)ifp;
struct ieee80211_node *ni, *nextbs, *selbs;
int i, fail;
if (ifp->if_flags & IFF_DEBUG)
printf("%s: end %s scan\n", ifp->if_xname,
(ic->ic_flags & IEEE80211_F_ASCAN) ?
"active" : "passive");
if (ic->ic_scan_count)
ic->ic_flags &= ~IEEE80211_F_ASCAN;
ni = RB_MIN(ieee80211_tree, &ic->ic_tree);
if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
/* XXX off stack? */
u_char occupied[howmany(IEEE80211_CHAN_MAX, NBBY)];
/*
* The passive scan to look for existing AP's completed,
* select a channel to camp on. Identify the channels
* that already have one or more AP's and try to locate
* an unnoccupied one. If that fails, pick a random
* channel from the active set.
*/
RB_FOREACH(ni, ieee80211_tree, &ic->ic_tree)
setbit(occupied, ieee80211_chan2ieee(ic, ni->ni_chan));
for (i = 0; i < IEEE80211_CHAN_MAX; i++)
if (isset(ic->ic_chan_active, i) && isclr(occupied, i))
break;
if (i == IEEE80211_CHAN_MAX) {
fail = arc4random() & 3; /* random 0-3 */
for (i = 0; i < IEEE80211_CHAN_MAX; i++)
if (isset(ic->ic_chan_active, i) && fail-- == 0)
break;
}
ieee80211_create_ibss(ic, &ic->ic_channels[i]);
goto wakeup;
}
if (ni == NULL) {
IEEE80211_DPRINTF(("%s: no scan candidate\n", __func__));
notfound:
if (ic->ic_opmode == IEEE80211_M_IBSS &&
(ic->ic_flags & IEEE80211_F_IBSSON) &&
ic->ic_des_esslen != 0) {
ieee80211_create_ibss(ic, ic->ic_ibss_chan);
goto wakeup;
}
/*
* Scan the next mode if nothing has been found. This
* is necessary if the device supports different
* incompatible modes in the same channel range, like
* like 11b and "pure" 11G mode. This will loop
* forever except for user-initiated scans.
*/
if (ieee80211_next_mode(ifp) == IEEE80211_MODE_AUTO) {
if (ic->ic_scan_lock & IEEE80211_SCAN_REQUEST &&
ic->ic_scan_lock & IEEE80211_SCAN_RESUME) {
ic->ic_scan_lock = IEEE80211_SCAN_LOCKED;
/* Return from an user-initiated scan */
wakeup(&ic->ic_scan_lock);
} else if (ic->ic_scan_lock & IEEE80211_SCAN_REQUEST)
goto wakeup;
ic->ic_scan_count++;
}
/*
* Reset the list of channels to scan and start again.
*/
ieee80211_next_scan(ifp);
return;
}
selbs = NULL;
for (; ni != NULL; ni = nextbs) {
nextbs = RB_NEXT(ieee80211_tree, &ic->ic_tree, ni);
if (ni->ni_fails) {
/*
* The configuration of the access points may change
* during my scan. So delete the entry for the AP
* and retry to associate if there is another beacon.
*/
if (ni->ni_fails++ > 2)
ieee80211_free_node(ic, ni);
continue;
}
if (ieee80211_match_bss(ic, ni) == 0) {
if (selbs == NULL)
selbs = ni;
else if (ni->ni_rssi > selbs->ni_rssi)
selbs = ni;
}
}
if (selbs == NULL)
goto notfound;
(*ic->ic_node_copy)(ic, ic->ic_bss, selbs);
/*
* Set the erp state (mostly the slot time) to deal with
* the auto-select case; this should be redundant if the
* mode is locked.
*/
ic->ic_curmode = ieee80211_chan2mode(ic, selbs->ni_chan);
ieee80211_reset_erp(ic);
ieee80211_node_newstate(selbs, IEEE80211_STA_BSS);
if (ic->ic_opmode == IEEE80211_M_IBSS) {
ieee80211_fix_rate(ic, ic->ic_bss, IEEE80211_F_DOFRATE |
IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
if (ic->ic_bss->ni_rates.rs_nrates == 0)
goto notfound;
ieee80211_new_state(ic, IEEE80211_S_RUN, -1);
} else {
ieee80211_new_state(ic, IEEE80211_S_AUTH, -1);
}
wakeup:
if (ic->ic_scan_lock & IEEE80211_SCAN_REQUEST) {
/* Return from an user-initiated scan */
wakeup(&ic->ic_scan_lock);
}
ic->ic_scan_lock = IEEE80211_SCAN_UNLOCKED;
}
int
ieee80211_get_rate(struct ieee80211com *ic)
{
u_int8_t (*rates)[IEEE80211_RATE_MAXSIZE];
int rate;
rates = &ic->ic_bss->ni_rates.rs_rates;
if (ic->ic_fixed_rate != -1)
rate = (*rates)[ic->ic_fixed_rate];
else if (ic->ic_state == IEEE80211_S_RUN)
rate = (*rates)[ic->ic_bss->ni_txrate];
else
rate = 0;
return rate & IEEE80211_RATE_VAL;
}
struct ieee80211_node *
ieee80211_node_alloc(struct ieee80211com *ic)
{
struct ieee80211_node *ni;
MALLOC(ni, struct ieee80211_node *, sizeof(struct ieee80211_node),
M_80211_NODE, M_NOWAIT);
if (ni != NULL)
memset(ni, 0, sizeof(struct ieee80211_node));
return ni;
}
void
ieee80211_node_cleanup(struct ieee80211com *ic, struct ieee80211_node *ni)
{
}
void
ieee80211_node_free(struct ieee80211com *ic, struct ieee80211_node *ni)
{
ieee80211_node_cleanup(ic, ni);
FREE(ni, M_80211_NODE);
}
void
ieee80211_node_copy(struct ieee80211com *ic,
struct ieee80211_node *dst, const struct ieee80211_node *src)
{
ieee80211_node_cleanup(ic, dst);
*dst = *src;
}
u_int8_t
ieee80211_node_getrssi(struct ieee80211com *ic,
const struct ieee80211_node *ni)
{
return ni->ni_rssi;
}
void
ieee80211_setup_node(struct ieee80211com *ic,
struct ieee80211_node *ni, const u_int8_t *macaddr)
{
int s;
IEEE80211_DPRINTF(("%s %s\n", __func__,
ether_sprintf((u_int8_t *)macaddr)));
IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr);
ieee80211_node_newstate(ni, IEEE80211_STA_CACHE);
/*
* Note we don't enable the inactive timer when acting
* as a station. Nodes created in this mode represent
* AP's identified while scanning. If we time them out
* then several things happen: we can't return the data
* to users to show the list of AP's we encountered, and
* more importantly, we'll incorrectly deauthenticate
* ourself because the inactivity timer will kick us off.
*/
s = splnet();
if (ic->ic_opmode != IEEE80211_M_STA &&
RB_EMPTY(&ic->ic_tree))
ic->ic_inact_timer = IEEE80211_INACT_WAIT;
RB_INSERT(ieee80211_tree, &ic->ic_tree, ni);
splx(s);
}
struct ieee80211_node *
ieee80211_alloc_node(struct ieee80211com *ic, const u_int8_t *macaddr)
{
struct ieee80211_node *ni = ieee80211_alloc_node_helper(ic);
if (ni != NULL)
ieee80211_setup_node(ic, ni, macaddr);
else
ic->ic_stats.is_rx_nodealloc++;
return ni;
}
struct ieee80211_node *
ieee80211_dup_bss(struct ieee80211com *ic, const u_int8_t *macaddr)
{
struct ieee80211_node *ni = ieee80211_alloc_node_helper(ic);
if (ni != NULL) {
ieee80211_setup_node(ic, ni, macaddr);
/*
* Inherit from ic_bss.
*/
IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_bss->ni_bssid);
ni->ni_chan = ic->ic_bss->ni_chan;
} else
ic->ic_stats.is_rx_nodealloc++;
return ni;
}
struct ieee80211_node *
ieee80211_find_node(struct ieee80211com *ic, const u_int8_t *macaddr)
{
struct ieee80211_node ni;
IEEE80211_ADDR_COPY(ni.ni_macaddr, macaddr);
return (RB_FIND(ieee80211_tree, &ic->ic_tree, &ni));
}
/*
* Return a reference to the appropriate node for sending
* a data frame. This handles node discovery in adhoc networks.
*
* Drivers will call this, so increase the reference count before
* returning the node.
*/
struct ieee80211_node *
ieee80211_find_txnode(struct ieee80211com *ic, const u_int8_t *macaddr)
{
struct ieee80211_node *ni;
int s;
/*
* The destination address should be in the node table
* unless we are operating in station mode or this is a
* multicast/broadcast frame.
*/
if (ic->ic_opmode == IEEE80211_M_STA || IEEE80211_IS_MULTICAST(macaddr))
return ieee80211_ref_node(ic->ic_bss);
s = splnet();
ni = ieee80211_find_node(ic, macaddr);
splx(s);
if (ni == NULL) {
if (ic->ic_opmode != IEEE80211_M_IBSS &&
ic->ic_opmode != IEEE80211_M_AHDEMO)
return NULL;
/*
* Fake up a node; this handles node discovery in
* adhoc mode. Note that for the driver's benefit
* we we treat this like an association so the driver
* has an opportunity to setup its private state.
*
* XXX need better way to handle this; issue probe
* request so we can deduce rate set, etc.
*/
if ((ni = ieee80211_dup_bss(ic, macaddr)) == NULL)
return NULL;
/* XXX no rate negotiation; just dup */
ni->ni_rates = ic->ic_bss->ni_rates;
if (ic->ic_newassoc)
(*ic->ic_newassoc)(ic, ni, 1);
}
return ieee80211_ref_node(ni);
}
/*
* It is usually desirable to process a Rx packet using its sender's
* node-record instead of the BSS record.
*
* - AP mode: keep a node-record for every authenticated/associated
* station *in the BSS*. For future use, we also track neighboring
* APs, since they might belong to the same ESS. APs in the same
* ESS may bridge packets to each other, forming a Wireless
* Distribution System (WDS).
*
* - IBSS mode: keep a node-record for every station *in the BSS*.
* Also track neighboring stations by their beacons/probe responses.
*
* - monitor mode: keep a node-record for every sender, regardless
* of BSS.
*
* - STA mode: the only available node-record is the BSS record,
* ic->ic_bss.
*
* Of all the 802.11 Control packets, only the node-records for
* RTS packets node-record can be looked up.
*
* Return non-zero if the packet's node-record is kept, zero
* otherwise.
*/
static __inline int
ieee80211_needs_rxnode(struct ieee80211com *ic,
const struct ieee80211_frame *wh, const u_int8_t **bssid)
{
struct ieee80211_node *bss = ic->ic_bss;
int monitor, rc = 0;
monitor = (ic->ic_opmode == IEEE80211_M_MONITOR);
*bssid = NULL;
switch (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) {
case IEEE80211_FC0_TYPE_CTL:
if (!monitor)
break;
return (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) ==
IEEE80211_FC0_SUBTYPE_RTS;
case IEEE80211_FC0_TYPE_MGT:
*bssid = wh->i_addr3;
switch (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) {
case IEEE80211_FC0_SUBTYPE_BEACON:
case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
rc = 1;
break;
default:
if (ic->ic_opmode == IEEE80211_M_STA)
break;
rc = IEEE80211_ADDR_EQ(*bssid, bss->ni_bssid) ||
IEEE80211_ADDR_EQ(*bssid, etherbroadcastaddr);
break;
}
break;
case IEEE80211_FC0_TYPE_DATA:
switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) {
case IEEE80211_FC1_DIR_NODS:
*bssid = wh->i_addr3;
if (ic->ic_opmode == IEEE80211_M_IBSS ||
ic->ic_opmode == IEEE80211_M_AHDEMO)
rc = IEEE80211_ADDR_EQ(*bssid, bss->ni_bssid);
break;
case IEEE80211_FC1_DIR_TODS:
*bssid = wh->i_addr1;
if (ic->ic_opmode == IEEE80211_M_HOSTAP)
rc = IEEE80211_ADDR_EQ(*bssid, bss->ni_bssid);
break;
case IEEE80211_FC1_DIR_FROMDS:
case IEEE80211_FC1_DIR_DSTODS:
*bssid = wh->i_addr2;
rc = (ic->ic_opmode == IEEE80211_M_HOSTAP);
break;
}
break;
}
return monitor || rc;
}
/*
* Drivers call this, so increase the reference count before returning
* the node.
*/
struct ieee80211_node *
ieee80211_find_rxnode(struct ieee80211com *ic,
const struct ieee80211_frame *wh)
{
static const u_int8_t zero[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
struct ieee80211_node *ni;
const u_int8_t *bssid;
int s;
if (!ieee80211_needs_rxnode(ic, wh, &bssid))
return ieee80211_ref_node(ic->ic_bss);
s = splnet();
ni = ieee80211_find_node(ic, wh->i_addr2);
splx(s);
if (ni != NULL)
return ieee80211_ref_node(ni);
if (ic->ic_opmode == IEEE80211_M_HOSTAP)
return ieee80211_ref_node(ic->ic_bss);
/* XXX see remarks in ieee80211_find_txnode */
/* XXX no rate negotiation; just dup */
if ((ni = ieee80211_dup_bss(ic, wh->i_addr2)) == NULL)
return ieee80211_ref_node(ic->ic_bss);
IEEE80211_ADDR_COPY(ni->ni_bssid, (bssid != NULL) ? bssid : zero);
ni->ni_rates = ic->ic_bss->ni_rates;
if (ic->ic_newassoc)
(*ic->ic_newassoc)(ic, ni, 1);
IEEE80211_DPRINTF(("%s: faked-up node %p for %s\n", __func__, ni,
ether_sprintf((u_int8_t *)wh->i_addr2)));
return ieee80211_ref_node(ni);
}
struct ieee80211_node *
ieee80211_find_node_for_beacon(struct ieee80211com *ic,
const u_int8_t *macaddr, const struct ieee80211_channel *chan,
const char *ssid, u_int8_t rssi)
{
struct ieee80211_node *ni, *keep = NULL;
int s, score = 0;
if ((ni = ieee80211_find_node(ic, macaddr)) != NULL) {
s = splnet();
if (ni->ni_chan != chan && ni->ni_rssi >= rssi)
score++;
if (ssid[1] == 0 && ni->ni_esslen != 0)
score++;
if (score > 0)
keep = ni;
splx(s);
}
return (keep);
}
void
ieee80211_free_node(struct ieee80211com *ic, struct ieee80211_node *ni)
{
if (ni == ic->ic_bss)
panic("freeing bss node");
IEEE80211_DPRINTF(("%s %s\n", __func__, ether_sprintf(ni->ni_macaddr)));
IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap);
RB_REMOVE(ieee80211_tree, &ic->ic_tree, ni);
ic->ic_nnodes--;
if (!IF_IS_EMPTY(&ni->ni_savedq)) {
IF_PURGE(&ni->ni_savedq);
if (ic->ic_set_tim != NULL)
(*ic->ic_set_tim)(ic, ni->ni_associd, 0);
}
if (RB_EMPTY(&ic->ic_tree))
ic->ic_inact_timer = 0;
(*ic->ic_node_free)(ic, ni);
/* TBD indicate to drivers that a new node can be allocated */
}
void
ieee80211_release_node(struct ieee80211com *ic, struct ieee80211_node *ni)
{
int s;
IEEE80211_DPRINTF(("%s %s refcnt %d\n", __func__,
ether_sprintf(ni->ni_macaddr), ni->ni_refcnt));
if (ieee80211_node_decref(ni) == 0 &&
ni->ni_state == IEEE80211_STA_COLLECT) {
s = splnet();
ieee80211_free_node(ic, ni);
splx(s);
}
}
void
ieee80211_free_allnodes(struct ieee80211com *ic)
{
struct ieee80211_node *ni;
int s;
IEEE80211_DPRINTF(("%s\n", __func__));
s = splnet();
while ((ni = RB_MIN(ieee80211_tree, &ic->ic_tree)) != NULL)
ieee80211_free_node(ic, ni);
splx(s);
if (ic->ic_bss != NULL)
ieee80211_node_cleanup(ic, ic->ic_bss); /* for station mode */
}
/*
* Timeout inactive nodes.
*/
void
ieee80211_clean_nodes(struct ieee80211com *ic)
{
struct ieee80211_node *ni, *next_ni;
u_int gen = ic->ic_scangen++; /* NB: ok 'cuz single-threaded*/
int s;
s = splnet();
for (ni = RB_MIN(ieee80211_tree, &ic->ic_tree);
ni != NULL; ni = next_ni) {
next_ni = RB_NEXT(ieee80211_tree, &ic->ic_tree, ni);
if (ic->ic_nnodes <= ic->ic_max_nnodes)
break;
if (ni->ni_scangen == gen) /* previously handled */
continue;
ni->ni_scangen = gen;
if (ni->ni_refcnt > 0)
continue;
IEEE80211_DPRINTF(("station %s purged from LRU cache\n",
ether_sprintf(ni->ni_macaddr)));
/*
* Send a deauthenticate frame.
*/
if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
splx(s);
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_DEAUTH,
IEEE80211_REASON_AUTH_EXPIRE);
s = splnet();
ieee80211_node_leave(ic, ni);
} else
ieee80211_free_node(ic, ni);
ic->ic_stats.is_node_timeout++;
}
splx(s);
}
void
ieee80211_iterate_nodes(struct ieee80211com *ic, ieee80211_iter_func *f,
void *arg)
{
struct ieee80211_node *ni;
int s;
s = splnet();
RB_FOREACH(ni, ieee80211_tree, &ic->ic_tree)
(*f)(arg, ni);
splx(s);
}
/*
* Check if the specified node supports ERP.
*/
int
ieee80211_iserp_sta(const struct ieee80211_node *ni)
{
#define N(a) (sizeof (a) / sizeof (a)[0])
static const u_int8_t rates[] = { 2, 4, 11, 22, 12, 24, 48 };
const struct ieee80211_rateset *rs = &ni->ni_rates;
int i, j;
/*
* A STA supports ERP operation if it includes all the Clause 19
* mandatory rates in its supported rate set.
*/
for (i = 0; i < N(rates); i++) {
for (j = 0; j < rs->rs_nrates; j++) {
if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == rates[i])
break;
}
if (j == rs->rs_nrates)
return 0;
}
return 1;
#undef N
}
/*
* Handle a station joining an 11g network.
*/
void
ieee80211_node_join_11g(struct ieee80211com *ic, struct ieee80211_node *ni)
{
if (!(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)) {
/*
* Joining STA doesn't support short slot time. We must
* disable the use of short slot time for all other associated
* STAs and give the driver a chance to reconfigure the
* hardware.
*/
if (++ic->ic_longslotsta == 1) {
if (ic->ic_caps & IEEE80211_C_SHSLOT)
ieee80211_set_shortslottime(ic, 0);
}
IEEE80211_DPRINTF(("[%s] station needs long slot time, "
"count %d\n", ether_sprintf(ni->ni_macaddr),
ic->ic_longslotsta));
}
if (!ieee80211_iserp_sta(ni)) {
/*
* Joining STA is non-ERP.
*/
ic->ic_nonerpsta++;
IEEE80211_DPRINTF(("[%s] station is non-ERP, %d non-ERP "
"stations associated\n", ether_sprintf(ni->ni_macaddr),
ic->ic_nonerpsta));
/* must enable the use of protection */
if (ic->ic_protmode != IEEE80211_PROT_NONE) {
IEEE80211_DPRINTF(("%s: enable use of protection\n",
__func__));
ic->ic_flags |= IEEE80211_F_USEPROT;
}
if (!(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE))
ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
} else
ni->ni_flags |= IEEE80211_NODE_ERP;
}
void
ieee80211_node_join(struct ieee80211com *ic, struct ieee80211_node *ni,
int resp)
{
int newassoc;
if (ni->ni_associd == 0) {
u_int16_t aid;
/*
* It would be clever to search the bitmap
* more efficiently, but this will do for now.
*/
for (aid = 1; aid < ic->ic_max_aid; aid++) {
if (!IEEE80211_AID_ISSET(aid,
ic->ic_aid_bitmap))
break;
}
if (aid >= ic->ic_max_aid) {
IEEE80211_SEND_MGMT(ic, ni, resp,
IEEE80211_REASON_ASSOC_TOOMANY);
ieee80211_node_leave(ic, ni);
return;
}
ni->ni_associd = aid | 0xc000;
IEEE80211_AID_SET(ni->ni_associd, ic->ic_aid_bitmap);
newassoc = 1;
if (ic->ic_curmode == IEEE80211_MODE_11G)
ieee80211_node_join_11g(ic, ni);
} else
newassoc = 0;
IEEE80211_DPRINTF(("station %s %s associated at aid %d\n",
ether_sprintf(ni->ni_macaddr),
(newassoc ? "newly" : "already"),
ni->ni_associd & ~0xc000));
/* give driver a chance to setup state like ni_txrate */
if (ic->ic_newassoc)
(*ic->ic_newassoc)(ic, ni, newassoc);
IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_SUCCESS);
ieee80211_node_newstate(ni, IEEE80211_STA_ASSOC);
#if NBRIDGE > 0
/*
* If the parent interface belongs to a bridge, learn
* the node's address dynamically on this interface.
*/
if (ic->ic_if.if_bridge != NULL)
bridge_update(&ic->ic_if,
(struct ether_addr *)ni->ni_macaddr, 0);
#endif
}
/*
* Handle a station leaving an 11g network.
*/
void
ieee80211_node_leave_11g(struct ieee80211com *ic, struct ieee80211_node *ni)
{
if (!(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)) {
#ifdef DIAGNOSTIC
if (ic->ic_longslotsta == 0) {
panic("bogus long slot station count %d",
ic->ic_longslotsta);
}
#endif
/* leaving STA did not support short slot time */
if (--ic->ic_longslotsta == 0) {
/*
* All associated STAs now support short slot time, so
* enable this feature and give the driver a chance to
* reconfigure the hardware. Notice that IBSS always
* use a long slot time.
*/
if ((ic->ic_caps & IEEE80211_C_SHSLOT) &&
ic->ic_opmode != IEEE80211_M_IBSS)
ieee80211_set_shortslottime(ic, 1);
}
IEEE80211_DPRINTF(("[%s] long slot time station leaves, "
"count now %d\n", ether_sprintf(ni->ni_macaddr),
ic->ic_longslotsta));
}
if (!(ni->ni_flags & IEEE80211_NODE_ERP)) {
#ifdef DIAGNOSTIC
if (ic->ic_nonerpsta == 0) {
panic("bogus non-ERP station count %d\n",
ic->ic_nonerpsta);
}
#endif
/* leaving STA was non-ERP */
if (--ic->ic_nonerpsta == 0) {
/*
* All associated STAs are now ERP capable, disable use
* of protection and re-enable short preamble support.
*/
ic->ic_flags &= ~IEEE80211_F_USEPROT;
if (ic->ic_caps & IEEE80211_C_SHPREAMBLE)
ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
}
IEEE80211_DPRINTF(("[%s] non-ERP station leaves, "
"count now %d\n", ether_sprintf(ni->ni_macaddr),
ic->ic_nonerpsta));
}
}
/*
* Handle bookkeeping for station deauthentication/disassociation
* when operating as an ap.
*/
void
ieee80211_node_leave(struct ieee80211com *ic, struct ieee80211_node *ni)
{
if (ic->ic_opmode != IEEE80211_M_HOSTAP)
panic("not in ap mode, mode %u", ic->ic_opmode);
/*
* If node wasn't previously associated all
* we need to do is reclaim the reference.
*/
if (ni->ni_associd == 0)
return;
IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap);
ni->ni_associd = 0;
if (ic->ic_curmode == IEEE80211_MODE_11G)
ieee80211_node_leave_11g(ic, ni);
ieee80211_node_newstate(ni, IEEE80211_STA_COLLECT);
#if NBRIDGE > 0
/*
* If the parent interface belongs to a bridge, delete
* any dynamically learned address for this node.
*/
if (ic->ic_if.if_bridge != NULL)
bridge_update(&ic->ic_if,
(struct ether_addr *)ni->ni_macaddr, 1);
#endif
}
void
ieee80211_set_tim(struct ieee80211com *ic, int aid, int set)
{
if (set)
setbit(ic->ic_tim_bitmap, aid & ~0xc000);
else
clrbit(ic->ic_tim_bitmap, aid & ~0xc000);
}
/*
* Compare nodes in the tree by lladdr
*/
int
ieee80211_node_cmp(const struct ieee80211_node *b1,
const struct ieee80211_node *b2)
{
return (memcmp(b1->ni_macaddr, b2->ni_macaddr, IEEE80211_ADDR_LEN));
}
/*
* Generate red-black tree function logic
*/
RB_GENERATE(ieee80211_tree, ieee80211_node, ni_node, ieee80211_node_cmp);
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