606 lines
17 KiB
C
606 lines
17 KiB
C
/*-
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* Copyright (c) 2001 Atsushi Onoe
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* Copyright (c) 2002, 2003 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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__FBSDID("$FreeBSD$");
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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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#include <sys/bus.h>
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#include <sys/proc.h>
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#include <sys/sysctl.h>
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#include <machine/atomic.h>
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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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#include <net/ethernet.h>
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#include <net/if_llc.h>
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#include <net80211/ieee80211_var.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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#include <netinet/if_ether.h>
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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, "node", "802.11 node state");
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void
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ieee80211_node_attach(struct ifnet *ifp)
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{
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struct ieee80211com *ic = (void *)ifp;
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/* XXX need unit */
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IEEE80211_NODE_LOCK_INIT(ic, ifp->if_name);
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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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}
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void
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ieee80211_node_lateattach(struct ifnet *ifp)
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{
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struct ieee80211com *ic = (void *)ifp;
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ic->ic_bss = (*ic->ic_node_alloc)(ic);
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KASSERT(ic->ic_bss != NULL, ("unable to setup inital BSS node"));
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ic->ic_bss->ni_chan = IEEE80211_CHAN_ANYC;
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}
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void
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ieee80211_node_detach(struct ifnet *ifp)
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{
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struct ieee80211com *ic = (void *)ifp;
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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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ieee80211_free_allnodes(ic);
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IEEE80211_NODE_LOCK_DESTROY(ic);
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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 ifnet *ifp)
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{
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struct ieee80211com *ic = (void *)ifp;
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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 ifnet *ifp)
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{
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struct ieee80211com *ic = (void *)ifp;
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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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if (ifp->if_flags & IFF_DEBUG)
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if_printf(ifp, "begin %s scan\n",
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(ic->ic_flags & IEEE80211_F_ASCAN) ?
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"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(ifp);
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ieee80211_free_allnodes(ic);
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/* Scan the next channel. */
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ieee80211_next_scan(ifp);
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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 ifnet *ifp)
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{
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struct ieee80211com *ic = (void *)ifp;
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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(ifp);
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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(("ieee80211_next_scan: chan %d->%d\n",
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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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struct ifnet *ifp = &ic->ic_if;
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ni = ic->ic_bss;
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if (ifp->if_flags & IFF_DEBUG)
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if_printf(ifp, "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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ni->ni_bssid[0] |= 0x02; /* local bit for IBSS */
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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_WEPON)
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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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/*
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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 ifnet *ifp)
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{
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struct ieee80211com *ic = (void *)ifp;
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struct ieee80211_node *ni, *nextbs, *selbs;
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u_int8_t rate;
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int i, fail;
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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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ieee80211_ref_node(ni);
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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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ieee80211_free_node(ic, ni);
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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(("%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(ifp);
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ieee80211_next_scan(ifp);
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return;
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}
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selbs = NULL;
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if (ifp->if_flags & IFF_DEBUG)
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if_printf(ifp, "\tmacaddr bssid chan rssi rate flag wep essid\n");
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for (; ni != NULL; ni = nextbs) {
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ieee80211_ref_node(ni);
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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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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_WEPON) {
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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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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,
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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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if (ifp->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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if (!fail) {
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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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ieee80211_unref_node(&selbs);
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selbs = ni;
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} else
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ieee80211_unref_node(&ni);
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} else {
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ieee80211_unref_node(&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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(*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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selbs->ni_fails++;
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ieee80211_unref_node(&selbs);
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goto notfound;
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}
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ieee80211_unref_node(&selbs);
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ieee80211_new_state(ic, IEEE80211_S_RUN, -1);
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} else {
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ieee80211_unref_node(&selbs);
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ieee80211_new_state(ic, IEEE80211_S_AUTH, -1);
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}
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}
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static struct ieee80211_node *
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ieee80211_node_alloc(struct ieee80211com *ic)
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{
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return malloc(sizeof(struct ieee80211_node), M_80211_NODE,
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M_NOWAIT | M_ZERO);
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}
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static void
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ieee80211_node_free(struct ieee80211com *ic, struct ieee80211_node *ni)
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{
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free(ni, M_80211_NODE);
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}
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static void
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ieee80211_node_copy(struct ieee80211com *ic,
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struct ieee80211_node *dst, const struct ieee80211_node *src)
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{
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*dst = *src;
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}
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static u_int8_t
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ieee80211_node_getrssi(struct ieee80211com *ic, struct ieee80211_node *ni)
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{
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return ni->ni_rssi;
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}
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static void
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ieee80211_setup_node(struct ieee80211com *ic,
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struct ieee80211_node *ni, u_int8_t *macaddr)
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{
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int hash;
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IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr);
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hash = IEEE80211_NODE_HASH(macaddr);
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ni->ni_refcnt = 1; /* mark referenced */
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IEEE80211_NODE_LOCK(ic);
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TAILQ_INSERT_TAIL(&ic->ic_node, ni, ni_list);
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LIST_INSERT_HEAD(&ic->ic_hash[hash], ni, ni_hash);
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/*
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* Note we don't enable the inactive timer when acting
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* as a station. Nodes created in this mode represent
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* AP's identified while scanning. If we time them out
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* then several things happen: we can't return the data
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* to users to show the list of AP's we encountered, and
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* more importantly, we'll incorrectly deauthenticate
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* ourself because the inactivity timer will kick us off.
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*/
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if (ic->ic_opmode != IEEE80211_M_STA)
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ic->ic_inact_timer = IEEE80211_INACT_WAIT;
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IEEE80211_NODE_UNLOCK(ic);
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}
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struct ieee80211_node *
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ieee80211_alloc_node(struct ieee80211com *ic, u_int8_t *macaddr)
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{
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struct ieee80211_node *ni = (*ic->ic_node_alloc)(ic);
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if (ni != NULL)
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ieee80211_setup_node(ic, ni, macaddr);
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return ni;
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}
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struct ieee80211_node *
|
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ieee80211_dup_bss(struct ieee80211com *ic, u_int8_t *macaddr)
|
|
{
|
|
struct ieee80211_node *ni = (*ic->ic_node_alloc)(ic);
|
|
if (ni != NULL) {
|
|
memcpy(ni, ic->ic_bss, sizeof(struct ieee80211_node));
|
|
ieee80211_setup_node(ic, ni, macaddr);
|
|
}
|
|
return ni;
|
|
}
|
|
|
|
struct ieee80211_node *
|
|
ieee80211_find_node(struct ieee80211com *ic, u_int8_t *macaddr)
|
|
{
|
|
struct ieee80211_node *ni;
|
|
int hash;
|
|
|
|
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)) {
|
|
atomic_add_int(&ni->ni_refcnt, 1); /* mark referenced */
|
|
break;
|
|
}
|
|
}
|
|
IEEE80211_NODE_UNLOCK(ic);
|
|
return ni;
|
|
}
|
|
|
|
/*
|
|
* Like find but search based on the channel too.
|
|
*/
|
|
struct ieee80211_node *
|
|
ieee80211_lookup_node(struct ieee80211com *ic,
|
|
u_int8_t *macaddr, struct ieee80211_channel *chan)
|
|
{
|
|
struct ieee80211_node *ni;
|
|
int hash;
|
|
|
|
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) && ni->ni_chan == chan) {
|
|
atomic_add_int(&ni->ni_refcnt, 1);/* mark referenced */
|
|
break;
|
|
}
|
|
}
|
|
IEEE80211_NODE_UNLOCK(ic);
|
|
return ni;
|
|
}
|
|
|
|
static void
|
|
_ieee80211_free_node(struct ieee80211com *ic, struct ieee80211_node *ni)
|
|
{
|
|
KASSERT(ni != ic->ic_bss, ("freeing bss node"));
|
|
|
|
TAILQ_REMOVE(&ic->ic_node, ni, ni_list);
|
|
LIST_REMOVE(ni, ni_hash);
|
|
if (TAILQ_EMPTY(&ic->ic_node))
|
|
ic->ic_inact_timer = 0;
|
|
(*ic->ic_node_free)(ic, ni);
|
|
}
|
|
|
|
void
|
|
ieee80211_free_node(struct ieee80211com *ic, struct ieee80211_node *ni)
|
|
{
|
|
KASSERT(ni != ic->ic_bss, ("freeing ic_bss"));
|
|
|
|
/* XXX need equivalent of atomic_dec_and_test */
|
|
atomic_subtract_int(&ni->ni_refcnt, 1);
|
|
if (atomic_cmpset_int(&ni->ni_refcnt, 0, 1)) {
|
|
IEEE80211_NODE_LOCK(ic);
|
|
_ieee80211_free_node(ic, ni);
|
|
IEEE80211_NODE_UNLOCK(ic);
|
|
}
|
|
}
|
|
|
|
void
|
|
ieee80211_free_allnodes(struct ieee80211com *ic)
|
|
{
|
|
struct ieee80211_node *ni;
|
|
|
|
IEEE80211_NODE_LOCK(ic);
|
|
while ((ni = TAILQ_FIRST(&ic->ic_node)) != NULL)
|
|
_ieee80211_free_node(ic, ni);
|
|
IEEE80211_NODE_UNLOCK(ic);
|
|
}
|
|
|
|
/*
|
|
* 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_timeout_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 (ni->ni_scangen == gen) /* previously handled */
|
|
continue;
|
|
ni->ni_scangen = gen;
|
|
if (++ni->ni_inact > IEEE80211_INACT_MAX) {
|
|
IEEE80211_DPRINTF(("station %s timed out "
|
|
"due to inactivity (%u secs)\n",
|
|
ether_sprintf(ni->ni_macaddr),
|
|
ni->ni_inact));
|
|
/*
|
|
* 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);
|
|
IEEE80211_SEND_MGMT(ic, ni,
|
|
IEEE80211_FC0_SUBTYPE_DEAUTH,
|
|
IEEE80211_REASON_AUTH_EXPIRE);
|
|
ieee80211_free_node(ic, ni);
|
|
ic->ic_stats.is_node_timeout++;
|
|
goto restart;
|
|
}
|
|
}
|
|
if (!TAILQ_EMPTY(&ic->ic_node))
|
|
ic->ic_inact_timer = IEEE80211_INACT_WAIT;
|
|
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);
|
|
}
|