980 lines
27 KiB
C
980 lines
27 KiB
C
/* $NetBSD: ieee80211_node.c,v 1.36 2004/10/04 07:35:48 dyoung Exp $ */
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/*-
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* Copyright (c) 2001 Atsushi Onoe
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* Copyright (c) 2002-2004 Sam Leffler, Errno Consulting
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifdef __FreeBSD__
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__FBSDID("$FreeBSD: src/sys/net80211/ieee80211_node.c,v 1.22 2004/04/05 04:15:55 sam Exp $");
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#else
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__KERNEL_RCSID(0, "$NetBSD: ieee80211_node.c,v 1.36 2004/10/04 07:35:48 dyoung Exp $");
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#endif
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#include "opt_inet.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/malloc.h>
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#include <sys/kernel.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/endian.h>
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#include <sys/errno.h>
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#ifdef __FreeBSD__
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#include <sys/bus.h>
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#endif
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#include <sys/proc.h>
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#include <sys/sysctl.h>
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#ifdef __FreeBSD__
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#include <machine/atomic.h>
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#endif
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/if_media.h>
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#include <net/if_arp.h>
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#ifdef __FreeBSD__
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#include <net/ethernet.h>
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#else
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#include <net/if_ether.h>
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#endif
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#include <net/if_llc.h>
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#include <net80211/ieee80211_var.h>
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#include <net80211/ieee80211_compat.h>
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#include <net/bpf.h>
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#ifdef INET
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#include <netinet/in.h>
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#ifdef __FreeBSD__
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#include <netinet/if_ether.h>
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#else
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#include <net/if_ether.h>
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#endif
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#endif
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static struct ieee80211_node *ieee80211_node_alloc(struct ieee80211com *);
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static void ieee80211_node_free(struct ieee80211com *, struct ieee80211_node *);
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static void ieee80211_node_copy(struct ieee80211com *,
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struct ieee80211_node *, const struct ieee80211_node *);
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static u_int8_t ieee80211_node_getrssi(struct ieee80211com *,
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struct ieee80211_node *);
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static void ieee80211_setup_node(struct ieee80211com *ic,
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struct ieee80211_node *ni, u_int8_t *macaddr);
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static void ieee80211_free_node(struct ieee80211com *,
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struct ieee80211_node *);
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MALLOC_DEFINE(M_80211_NODE, "80211node", "802.11 node state");
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void
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ieee80211_node_attach(struct ieee80211com *ic)
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{
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/* XXX need unit */
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IEEE80211_NODE_LOCK_INIT(ic, ic->ic_ifp->if_xname);
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TAILQ_INIT(&ic->ic_node);
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ic->ic_node_alloc = ieee80211_node_alloc;
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ic->ic_node_free = ieee80211_node_free;
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ic->ic_node_copy = ieee80211_node_copy;
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ic->ic_node_getrssi = ieee80211_node_getrssi;
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ic->ic_scangen = 1;
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ic->ic_max_nnodes = ieee80211_cache_size;
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if (ic->ic_max_aid == 0)
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ic->ic_max_aid = IEEE80211_AID_DEF;
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else if (ic->ic_max_aid > IEEE80211_AID_MAX)
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ic->ic_max_aid = IEEE80211_AID_MAX;
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MALLOC(ic->ic_aid_bitmap, u_int32_t *,
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howmany(ic->ic_max_aid, 32) * sizeof(u_int32_t),
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M_DEVBUF, M_NOWAIT | M_ZERO);
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if (ic->ic_aid_bitmap == NULL) {
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/* XXX no way to recover */
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printf("%s: no memory for AID bitmap!\n", __func__);
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ic->ic_max_aid = 0;
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}
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}
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static struct ieee80211_node *
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ieee80211_alloc_node_helper(struct ieee80211com *ic)
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{
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struct ieee80211_node *ni;
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if (ic->ic_nnodes >= ic->ic_max_nnodes)
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ieee80211_clean_nodes(ic);
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if (ic->ic_nnodes >= ic->ic_max_nnodes)
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return NULL;
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ni = (*ic->ic_node_alloc)(ic);
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if (ni != NULL)
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ic->ic_nnodes++;
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return ni;
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}
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void
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ieee80211_node_lateattach(struct ieee80211com *ic)
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{
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struct ieee80211_node *ni;
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ni = ieee80211_alloc_node_helper(ic);
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IASSERT(ni != NULL, ("unable to setup inital BSS node"));
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ni->ni_chan = IEEE80211_CHAN_ANYC;
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ic->ic_bss = ieee80211_ref_node(ni);
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ic->ic_txpower = IEEE80211_TXPOWER_MAX;
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}
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void
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ieee80211_node_detach(struct ieee80211com *ic)
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{
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if (ic->ic_bss != NULL) {
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(*ic->ic_node_free)(ic, ic->ic_bss);
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ic->ic_bss = NULL;
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}
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ieee80211_free_allnodes(ic);
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IEEE80211_NODE_LOCK_DESTROY(ic);
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if (ic->ic_aid_bitmap != NULL)
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FREE(ic->ic_aid_bitmap, M_DEVBUF);
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}
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/*
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* AP scanning support.
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*/
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/*
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* Initialize the active channel set based on the set
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* of available channels and the current PHY mode.
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*/
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static void
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ieee80211_reset_scan(struct ieee80211com *ic)
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{
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memcpy(ic->ic_chan_scan, ic->ic_chan_active,
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sizeof(ic->ic_chan_active));
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/* NB: hack, setup so next_scan starts with the first channel */
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if (ic->ic_bss->ni_chan == IEEE80211_CHAN_ANYC)
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ic->ic_bss->ni_chan = &ic->ic_channels[IEEE80211_CHAN_MAX];
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}
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/*
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* Begin an active scan.
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*/
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void
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ieee80211_begin_scan(struct ieee80211com *ic)
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{
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/*
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* In all but hostap mode scanning starts off in
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* an active mode before switching to passive.
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*/
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if (ic->ic_opmode != IEEE80211_M_HOSTAP) {
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ic->ic_flags |= IEEE80211_F_ASCAN;
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ic->ic_stats.is_scan_active++;
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} else
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ic->ic_stats.is_scan_passive++;
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IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, ("begin %s scan\n",
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(ic->ic_flags & IEEE80211_F_ASCAN) ? "active" : "passive"));
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/*
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* Clear scan state and flush any previously seen
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* AP's. Note that the latter assumes we don't act
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* as both an AP and a station, otherwise we'll
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* potentially flush state of stations associated
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* with us.
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*/
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ieee80211_reset_scan(ic);
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ieee80211_free_allnodes(ic);
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/* Scan the next channel. */
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ieee80211_next_scan(ic);
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}
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/*
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* Switch to the next channel marked for scanning.
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*/
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void
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ieee80211_next_scan(struct ieee80211com *ic)
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{
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struct ieee80211_channel *chan;
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chan = ic->ic_bss->ni_chan;
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for (;;) {
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if (++chan > &ic->ic_channels[IEEE80211_CHAN_MAX])
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chan = &ic->ic_channels[0];
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if (isset(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan))) {
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/*
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* Honor channels marked passive-only
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* during an active scan.
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*/
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if ((ic->ic_flags & IEEE80211_F_ASCAN) == 0 ||
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(chan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0)
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break;
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}
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if (chan == ic->ic_bss->ni_chan) {
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ieee80211_end_scan(ic);
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return;
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}
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}
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clrbit(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan));
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IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN,
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("%s: chan %d->%d\n", __func__,
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ieee80211_chan2ieee(ic, ic->ic_bss->ni_chan),
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ieee80211_chan2ieee(ic, chan)));
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ic->ic_bss->ni_chan = chan;
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ieee80211_new_state(ic, IEEE80211_S_SCAN, -1);
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}
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void
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ieee80211_create_ibss(struct ieee80211com* ic, struct ieee80211_channel *chan)
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{
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struct ieee80211_node *ni;
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ni = ic->ic_bss;
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IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, ("creating ibss\n"));
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ic->ic_flags |= IEEE80211_F_SIBSS;
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ni->ni_chan = chan;
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ni->ni_rates = ic->ic_sup_rates[ieee80211_chan2mode(ic, ni->ni_chan)];
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IEEE80211_ADDR_COPY(ni->ni_macaddr, ic->ic_myaddr);
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IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_myaddr);
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if (ic->ic_opmode == IEEE80211_M_IBSS) {
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if ((ic->ic_flags & IEEE80211_F_DESBSSID) != 0)
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IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_des_bssid);
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else
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ni->ni_bssid[0] |= 0x02; /* local bit for IBSS */
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}
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ni->ni_esslen = ic->ic_des_esslen;
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memcpy(ni->ni_essid, ic->ic_des_essid, ni->ni_esslen);
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ni->ni_rssi = 0;
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ni->ni_rstamp = 0;
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memset(ni->ni_tstamp, 0, sizeof(ni->ni_tstamp));
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ni->ni_intval = ic->ic_lintval;
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ni->ni_capinfo = IEEE80211_CAPINFO_IBSS;
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if (ic->ic_flags & IEEE80211_F_PRIVACY)
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ni->ni_capinfo |= IEEE80211_CAPINFO_PRIVACY;
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if (ic->ic_phytype == IEEE80211_T_FH) {
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ni->ni_fhdwell = 200; /* XXX */
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ni->ni_fhindex = 1;
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}
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ieee80211_new_state(ic, IEEE80211_S_RUN, -1);
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}
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int
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ieee80211_match_bss(struct ieee80211com *ic, struct ieee80211_node *ni)
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{
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u_int8_t rate;
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int fail;
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fail = 0;
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if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan)))
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fail |= 0x01;
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if (ic->ic_des_chan != IEEE80211_CHAN_ANYC &&
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ni->ni_chan != ic->ic_des_chan)
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fail |= 0x01;
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if (ic->ic_opmode == IEEE80211_M_IBSS) {
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if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0)
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fail |= 0x02;
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} else {
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if ((ni->ni_capinfo & IEEE80211_CAPINFO_ESS) == 0)
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fail |= 0x02;
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}
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if (ic->ic_flags & IEEE80211_F_PRIVACY) {
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if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0)
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fail |= 0x04;
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} else {
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/* XXX does this mean privacy is supported or required? */
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if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY)
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fail |= 0x04;
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}
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rate = ieee80211_fix_rate(ic, ni, IEEE80211_F_DONEGO);
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if (rate & IEEE80211_RATE_BASIC)
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fail |= 0x08;
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if (ic->ic_des_esslen != 0 &&
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(ni->ni_esslen != ic->ic_des_esslen ||
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memcmp(ni->ni_essid, ic->ic_des_essid, ic->ic_des_esslen) != 0))
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fail |= 0x10;
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if ((ic->ic_flags & IEEE80211_F_DESBSSID) &&
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!IEEE80211_ADDR_EQ(ic->ic_des_bssid, ni->ni_bssid))
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fail |= 0x20;
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#ifdef IEEE80211_DEBUG
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if (ic->ic_if.if_flags & IFF_DEBUG) {
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printf(" %c %s", fail ? '-' : '+',
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ether_sprintf(ni->ni_macaddr));
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printf(" %s%c", ether_sprintf(ni->ni_bssid),
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fail & 0x20 ? '!' : ' ');
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printf(" %3d%c", ieee80211_chan2ieee(ic, ni->ni_chan),
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fail & 0x01 ? '!' : ' ');
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printf(" %+4d", ni->ni_rssi);
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printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2,
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fail & 0x08 ? '!' : ' ');
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printf(" %4s%c",
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(ni->ni_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" :
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(ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" :
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"????",
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fail & 0x02 ? '!' : ' ');
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printf(" %3s%c ",
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(ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) ?
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"wep" : "no",
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fail & 0x04 ? '!' : ' ');
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ieee80211_print_essid(ni->ni_essid, ni->ni_esslen);
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printf("%s\n", fail & 0x10 ? "!" : "");
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}
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#endif
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return fail;
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}
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/*
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* Complete a scan of potential channels.
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*/
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void
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ieee80211_end_scan(struct ieee80211com *ic)
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{
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struct ieee80211_node *ni, *nextbs, *selbs;
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int i, fail;
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IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, ("end %s scan\n",
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(ic->ic_flags & IEEE80211_F_ASCAN) ? "active" : "passive"));
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ic->ic_flags &= ~IEEE80211_F_ASCAN;
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ni = TAILQ_FIRST(&ic->ic_node);
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if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
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/* XXX off stack? */
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u_char occupied[roundup(IEEE80211_CHAN_MAX, NBBY)];
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/*
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* The passive scan to look for existing AP's completed,
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* select a channel to camp on. Identify the channels
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* that already have one or more AP's and try to locate
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* an unnoccupied one. If that fails, pick a random
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* channel from the active set.
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*/
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for (; ni != NULL; ni = nextbs) {
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nextbs = TAILQ_NEXT(ni, ni_list);
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setbit(occupied, ieee80211_chan2ieee(ic, ni->ni_chan));
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}
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for (i = 0; i < IEEE80211_CHAN_MAX; i++)
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if (isset(ic->ic_chan_active, i) && isclr(occupied, i))
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break;
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if (i == IEEE80211_CHAN_MAX) {
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fail = arc4random() & 3; /* random 0-3 */
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for (i = 0; i < IEEE80211_CHAN_MAX; i++)
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if (isset(ic->ic_chan_active, i) && fail-- == 0)
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break;
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}
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ieee80211_create_ibss(ic, &ic->ic_channels[i]);
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return;
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}
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if (ni == NULL) {
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IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN,
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("%s: no scan candidate\n", __func__));
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notfound:
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if (ic->ic_opmode == IEEE80211_M_IBSS &&
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(ic->ic_flags & IEEE80211_F_IBSSON) &&
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ic->ic_des_esslen != 0) {
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ieee80211_create_ibss(ic, ic->ic_ibss_chan);
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return;
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}
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/*
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* Reset the list of channels to scan and start again.
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*/
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ieee80211_reset_scan(ic);
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ieee80211_next_scan(ic);
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return;
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}
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selbs = NULL;
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IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN,
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("\tmacaddr bssid chan rssi rate flag wep essid\n"));
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for (; ni != NULL; ni = nextbs) {
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nextbs = TAILQ_NEXT(ni, ni_list);
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if (ni->ni_fails) {
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/*
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* The configuration of the access points may change
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* during my scan. So delete the entry for the AP
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* and retry to associate if there is another beacon.
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*/
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if (ni->ni_fails++ > 2)
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ieee80211_free_node(ic, ni);
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continue;
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}
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if (ieee80211_match_bss(ic, ni) == 0) {
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if (selbs == NULL)
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selbs = ni;
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else if (ni->ni_rssi > selbs->ni_rssi)
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selbs = ni;
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}
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}
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if (selbs == NULL)
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goto notfound;
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ieee80211_node_newstate(selbs, IEEE80211_STA_BSS);
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(*ic->ic_node_copy)(ic, ic->ic_bss, selbs);
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if (ic->ic_opmode == IEEE80211_M_IBSS) {
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ieee80211_fix_rate(ic, ic->ic_bss, IEEE80211_F_DOFRATE |
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IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
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if (ic->ic_bss->ni_rates.rs_nrates == 0)
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goto notfound;
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ieee80211_new_state(ic, IEEE80211_S_RUN, -1);
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} else {
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ieee80211_new_state(ic, IEEE80211_S_AUTH, -1);
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}
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}
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int
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ieee80211_get_rate(struct ieee80211com *ic)
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{
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u_int8_t (*rates)[IEEE80211_RATE_MAXSIZE];
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int rate;
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rates = &ic->ic_bss->ni_rates.rs_rates;
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|
|
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;
|
|
}
|
|
|
|
static 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 | M_ZERO);
|
|
return ni;
|
|
}
|
|
|
|
static void
|
|
node_cleanup(struct ieee80211com *ic, struct ieee80211_node *ni)
|
|
{
|
|
if (ni->ni_challenge != NULL) {
|
|
FREE(ni->ni_challenge, M_DEVBUF);
|
|
ni->ni_challenge = NULL;
|
|
}
|
|
}
|
|
|
|
static void
|
|
ieee80211_node_free(struct ieee80211com *ic, struct ieee80211_node *ni)
|
|
{
|
|
node_cleanup(ic, ni);
|
|
FREE(ni, M_80211_NODE);
|
|
}
|
|
|
|
static void
|
|
ieee80211_node_copy(struct ieee80211com *ic,
|
|
struct ieee80211_node *dst, const struct ieee80211_node *src)
|
|
{
|
|
node_cleanup(ic, dst);
|
|
*dst = *src;
|
|
dst->ni_challenge = NULL;
|
|
}
|
|
|
|
static u_int8_t
|
|
ieee80211_node_getrssi(struct ieee80211com *ic, struct ieee80211_node *ni)
|
|
{
|
|
return ni->ni_rssi;
|
|
}
|
|
|
|
static void
|
|
ieee80211_setup_node(struct ieee80211com *ic,
|
|
struct ieee80211_node *ni, u_int8_t *macaddr)
|
|
{
|
|
int hash;
|
|
|
|
IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
|
|
("%s %s\n", __func__, ether_sprintf(macaddr)));
|
|
IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr);
|
|
hash = IEEE80211_NODE_HASH(macaddr);
|
|
ieee80211_node_newstate(ni, IEEE80211_STA_CACHE);
|
|
|
|
IEEE80211_NODE_LOCK_BH(ic);
|
|
/*
|
|
* 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.
|
|
*/
|
|
if (ic->ic_opmode != IEEE80211_M_STA &&
|
|
TAILQ_EMPTY(&ic->ic_node))
|
|
ic->ic_inact_timer = IEEE80211_INACT_WAIT;
|
|
TAILQ_INSERT_TAIL(&ic->ic_node, ni, ni_list);
|
|
LIST_INSERT_HEAD(&ic->ic_hash[hash], ni, ni_hash);
|
|
IEEE80211_NODE_UNLOCK_BH(ic);
|
|
}
|
|
|
|
struct ieee80211_node *
|
|
ieee80211_alloc_node(struct ieee80211com *ic, 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, 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;
|
|
}
|
|
|
|
static struct ieee80211_node *
|
|
_ieee80211_find_node(struct ieee80211com *ic, u_int8_t *macaddr)
|
|
{
|
|
struct ieee80211_node *ni;
|
|
int hash;
|
|
|
|
IEEE80211_NODE_LOCK_ASSERT(ic);
|
|
|
|
hash = IEEE80211_NODE_HASH(macaddr);
|
|
LIST_FOREACH(ni, &ic->ic_hash[hash], ni_hash) {
|
|
if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr)) {
|
|
/* least-recently used is at tail */
|
|
TAILQ_REMOVE(&ic->ic_node, ni, ni_list);
|
|
TAILQ_INSERT_TAIL(&ic->ic_node, ni, ni_list);
|
|
return ni;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
struct ieee80211_node *
|
|
ieee80211_find_node(struct ieee80211com *ic, u_int8_t *macaddr)
|
|
{
|
|
struct ieee80211_node *ni;
|
|
|
|
IEEE80211_NODE_LOCK(ic);
|
|
ni = _ieee80211_find_node(ic, macaddr);
|
|
IEEE80211_NODE_UNLOCK(ic);
|
|
return 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, u_int8_t *macaddr)
|
|
{
|
|
struct ieee80211_node *ni;
|
|
|
|
/*
|
|
* 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);
|
|
|
|
/* XXX can't hold lock across dup_bss 'cuz of recursive locking */
|
|
IEEE80211_NODE_LOCK(ic);
|
|
ni = _ieee80211_find_node(ic, macaddr);
|
|
IEEE80211_NODE_UNLOCK(ic);
|
|
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 it's 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, struct ieee80211_frame *wh,
|
|
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, struct ieee80211_frame *wh)
|
|
{
|
|
struct ieee80211_node *ni;
|
|
const static u_int8_t zero[IEEE80211_ADDR_LEN];
|
|
u_int8_t *bssid;
|
|
|
|
if (!ieee80211_needs_rxnode(ic, wh, &bssid))
|
|
return ieee80211_ref_node(ic->ic_bss);
|
|
|
|
IEEE80211_NODE_LOCK(ic);
|
|
ni = _ieee80211_find_node(ic, wh->i_addr2);
|
|
IEEE80211_NODE_UNLOCK(ic);
|
|
|
|
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(ic, IEEE80211_MSG_NODE,
|
|
("%s: faked-up node %p for %s\n", __func__, ni,
|
|
ether_sprintf(wh->i_addr2)));
|
|
|
|
return ieee80211_ref_node(ni);
|
|
}
|
|
|
|
/*
|
|
* Like find but search based on the channel too.
|
|
*
|
|
* Note that ieee80211_find_node_for_beacon does not increase the
|
|
* reference count before returning the node, because drivers are not
|
|
* expected to call it.
|
|
*/
|
|
struct ieee80211_node *
|
|
ieee80211_find_node_for_beacon(struct ieee80211com *ic, u_int8_t *macaddr,
|
|
struct ieee80211_channel *chan, char *ssid)
|
|
{
|
|
struct ieee80211_node *ni, *best;
|
|
int hash;
|
|
int best_score, score;
|
|
|
|
best = NULL;
|
|
best_score = -1;
|
|
|
|
hash = IEEE80211_NODE_HASH(macaddr);
|
|
IEEE80211_NODE_LOCK(ic);
|
|
LIST_FOREACH(ni, &ic->ic_hash[hash], ni_hash) {
|
|
if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr))
|
|
continue;
|
|
|
|
score = (ni->ni_chan == chan) ? 1 : 0;
|
|
|
|
if (ssid[1] == 0 || ni->ni_esslen == 0)
|
|
score++;
|
|
else if (ssid[1] != ni->ni_esslen ||
|
|
memcmp(ssid + 2, ni->ni_essid, ssid[1]) != 0)
|
|
continue;
|
|
|
|
if (score > best_score) {
|
|
best = ni;
|
|
best_score = score;
|
|
}
|
|
}
|
|
IEEE80211_NODE_UNLOCK(ic);
|
|
return best;
|
|
}
|
|
|
|
static void
|
|
ieee80211_free_node(struct ieee80211com *ic, struct ieee80211_node *ni)
|
|
{
|
|
IASSERT(ni != ic->ic_bss, ("freeing bss node"));
|
|
|
|
IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
|
|
("%s %s\n", __func__, ether_sprintf(ni->ni_macaddr)));
|
|
IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap);
|
|
TAILQ_REMOVE(&ic->ic_node, ni, ni_list);
|
|
LIST_REMOVE(ni, ni_hash);
|
|
ic->ic_nnodes--;
|
|
if (!IF_IS_EMPTY(&ni->ni_savedq)) {
|
|
IF_PURGE(&ni->ni_savedq);
|
|
if (ic->ic_set_tim)
|
|
(*ic->ic_set_tim)(ic, ni->ni_associd, 0);
|
|
}
|
|
if (TAILQ_EMPTY(&ic->ic_node))
|
|
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)
|
|
{
|
|
IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
|
|
("%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) {
|
|
IEEE80211_NODE_LOCK_BH(ic);
|
|
ieee80211_free_node(ic, ni);
|
|
IEEE80211_NODE_UNLOCK_BH(ic);
|
|
}
|
|
}
|
|
|
|
void
|
|
ieee80211_free_allnodes(struct ieee80211com *ic)
|
|
{
|
|
struct ieee80211_node *ni;
|
|
|
|
IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, ("free all nodes\n"));
|
|
IEEE80211_NODE_LOCK_BH(ic);
|
|
while ((ni = TAILQ_FIRST(&ic->ic_node)) != NULL)
|
|
ieee80211_free_node(ic, ni);
|
|
IEEE80211_NODE_UNLOCK_BH(ic);
|
|
|
|
if (ic->ic_bss != NULL)
|
|
node_cleanup(ic, ic->ic_bss); /* for station mode */
|
|
}
|
|
|
|
/*
|
|
* Timeout inactive nodes. Note that we cannot hold the node
|
|
* lock while sending a frame as this would lead to a LOR.
|
|
* Instead we use a generation number to mark nodes that we've
|
|
* scanned and drop the lock and restart a scan if we have to
|
|
* time out a node. Since we are single-threaded by virtue of
|
|
* controlling the inactivity timer we can be sure this will
|
|
* process each node only once.
|
|
*/
|
|
void
|
|
ieee80211_clean_nodes(struct ieee80211com *ic)
|
|
{
|
|
struct ieee80211_node *ni;
|
|
u_int gen = ic->ic_scangen++; /* NB: ok 'cuz single-threaded*/
|
|
|
|
restart:
|
|
IEEE80211_NODE_LOCK(ic);
|
|
TAILQ_FOREACH(ni, &ic->ic_node, ni_list) {
|
|
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(ic, IEEE80211_MSG_NODE,
|
|
("station %s purged from LRU cache\n",
|
|
ether_sprintf(ni->ni_macaddr)));
|
|
/*
|
|
* Send a deauthenticate frame.
|
|
*
|
|
* Drop the node lock before sending the
|
|
* deauthentication frame in case the driver takes
|
|
* a lock, as this will result in a LOR between the
|
|
* node lock and the driver lock.
|
|
*/
|
|
IEEE80211_NODE_UNLOCK(ic);
|
|
if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
|
|
IEEE80211_SEND_MGMT(ic, ni,
|
|
IEEE80211_FC0_SUBTYPE_DEAUTH,
|
|
IEEE80211_REASON_AUTH_EXPIRE);
|
|
ieee80211_node_leave(ic, ni);
|
|
} else
|
|
ieee80211_free_node(ic, ni);
|
|
ic->ic_stats.is_node_timeout++;
|
|
goto restart;
|
|
}
|
|
IEEE80211_NODE_UNLOCK(ic);
|
|
}
|
|
|
|
void
|
|
ieee80211_iterate_nodes(struct ieee80211com *ic, ieee80211_iter_func *f, void *arg)
|
|
{
|
|
struct ieee80211_node *ni;
|
|
|
|
IEEE80211_NODE_LOCK(ic);
|
|
TAILQ_FOREACH(ni, &ic->ic_node, ni_list)
|
|
(*f)(arg, ni);
|
|
IEEE80211_NODE_UNLOCK(ic);
|
|
}
|
|
|
|
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;
|
|
/* XXX for 11g must turn off short slot time if long
|
|
slot time sta associates */
|
|
} else
|
|
newassoc = 0;
|
|
|
|
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG,
|
|
("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);
|
|
}
|
|
|
|
/*
|
|
* Handle bookkeeping for station deauthentication/disassociation
|
|
* when operating as an ap.
|
|
*/
|
|
void
|
|
ieee80211_node_leave(struct ieee80211com *ic, struct ieee80211_node *ni)
|
|
{
|
|
|
|
IASSERT(ic->ic_opmode == IEEE80211_M_HOSTAP,
|
|
("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;
|
|
ieee80211_node_newstate(ni, IEEE80211_STA_COLLECT);
|
|
}
|