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freebsd-nq/sys/net80211/ieee80211_proto.c
Sam Leffler ef39d4be37 Correct rate set negotiation when operating as a station: if the 
AP has basic rates that we do not support then ignore them instead
of marking the rate set in error.

This fixes an 11b station associating with an 11g/b AP.
2003-09-26 16:54:55 +00:00

513 lines
14 KiB
C
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/*-
* 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.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* 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 <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* IEEE 802.11 protocol support.
*/
#include "opt_inet.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/bus.h>
#include <sys/proc.h>
#include <sys/sysctl.h>
#include <machine/atomic.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/if_arp.h>
#include <net/ethernet.h>
#include <net/if_llc.h>
#include <net80211/ieee80211_var.h>
#include <net/bpf.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/if_ether.h>
#endif
#define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2)
const char *ieee80211_mgt_subtype_name[] = {
"assoc_req", "assoc_resp", "reassoc_req", "reassoc_resp",
"probe_req", "probe_resp", "reserved#6", "reserved#7",
"beacon", "atim", "disassoc", "auth",
"deauth", "reserved#13", "reserved#14", "reserved#15"
};
const char *ieee80211_state_name[IEEE80211_S_MAX] = {
"INIT", /* IEEE80211_S_INIT */
"SCAN", /* IEEE80211_S_SCAN */
"AUTH", /* IEEE80211_S_AUTH */
"ASSOC", /* IEEE80211_S_ASSOC */
"RUN" /* IEEE80211_S_RUN */
};
static int ieee80211_newstate(struct ieee80211com *, enum ieee80211_state, int);
void
ieee80211_proto_attach(struct ifnet *ifp)
{
struct ieee80211com *ic = (void *)ifp;
ifp->if_hdrlen = sizeof(struct ieee80211_frame);
#ifdef notdef
ic->ic_rtsthreshold = IEEE80211_RTS_DEFAULT;
#else
ic->ic_rtsthreshold = IEEE80211_RTS_MAX;
#endif
ic->ic_fragthreshold = 2346; /* XXX not used yet */
ic->ic_fixed_rate = -1; /* no fixed rate */
mtx_init(&ic->ic_mgtq.ifq_mtx, ifp->if_name, "mgmt send q", MTX_DEF);
/* protocol state change handler */
ic->ic_newstate = ieee80211_newstate;
/* initialize management frame handlers */
ic->ic_recv_mgmt = ieee80211_recv_mgmt;
ic->ic_send_mgmt = ieee80211_send_mgmt;
}
void
ieee80211_proto_detach(struct ifnet *ifp)
{
struct ieee80211com *ic = (void *)ifp;
IF_DRAIN(&ic->ic_mgtq);
mtx_destroy(&ic->ic_mgtq.ifq_mtx);
}
void
ieee80211_print_essid(u_int8_t *essid, int len)
{
int i;
u_int8_t *p;
if (len > IEEE80211_NWID_LEN)
len = IEEE80211_NWID_LEN;
/* determine printable or not */
for (i = 0, p = essid; i < len; i++, p++) {
if (*p < ' ' || *p > 0x7e)
break;
}
if (i == len) {
printf("\"");
for (i = 0, p = essid; i < len; i++, p++)
printf("%c", *p);
printf("\"");
} else {
printf("0x");
for (i = 0, p = essid; i < len; i++, p++)
printf("%02x", *p);
}
}
void
ieee80211_dump_pkt(u_int8_t *buf, int len, int rate, int rssi)
{
struct ieee80211_frame *wh;
int i;
wh = (struct ieee80211_frame *)buf;
switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) {
case IEEE80211_FC1_DIR_NODS:
printf("NODS %s", ether_sprintf(wh->i_addr2));
printf("->%s", ether_sprintf(wh->i_addr1));
printf("(%s)", ether_sprintf(wh->i_addr3));
break;
case IEEE80211_FC1_DIR_TODS:
printf("TODS %s", ether_sprintf(wh->i_addr2));
printf("->%s", ether_sprintf(wh->i_addr3));
printf("(%s)", ether_sprintf(wh->i_addr1));
break;
case IEEE80211_FC1_DIR_FROMDS:
printf("FRDS %s", ether_sprintf(wh->i_addr3));
printf("->%s", ether_sprintf(wh->i_addr1));
printf("(%s)", ether_sprintf(wh->i_addr2));
break;
case IEEE80211_FC1_DIR_DSTODS:
printf("DSDS %s", ether_sprintf((u_int8_t *)&wh[1]));
printf("->%s", ether_sprintf(wh->i_addr3));
printf("(%s", ether_sprintf(wh->i_addr2));
printf("->%s)", ether_sprintf(wh->i_addr1));
break;
}
switch (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) {
case IEEE80211_FC0_TYPE_DATA:
printf(" data");
break;
case IEEE80211_FC0_TYPE_MGT:
printf(" %s", ieee80211_mgt_subtype_name[
(wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK)
>> IEEE80211_FC0_SUBTYPE_SHIFT]);
break;
default:
printf(" type#%d", wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK);
break;
}
if (wh->i_fc[1] & IEEE80211_FC1_WEP)
printf(" WEP");
if (rate >= 0)
printf(" %dM", rate / 2);
if (rssi >= 0)
printf(" +%d", rssi);
printf("\n");
if (len > 0) {
for (i = 0; i < len; i++) {
if ((i & 1) == 0)
printf(" ");
printf("%02x", buf[i]);
}
printf("\n");
}
}
int
ieee80211_fix_rate(struct ieee80211com *ic, struct ieee80211_node *ni, int flags)
{
#define RV(v) ((v) & IEEE80211_RATE_VAL)
int i, j, ignore, error;
int okrate, badrate;
struct ieee80211_rateset *srs, *nrs;
u_int8_t r;
error = 0;
okrate = badrate = 0;
srs = &ic->ic_sup_rates[ieee80211_chan2mode(ic, ni->ni_chan)];
nrs = &ni->ni_rates;
for (i = 0; i < nrs->rs_nrates; ) {
ignore = 0;
if (flags & IEEE80211_F_DOSORT) {
/*
* Sort rates.
*/
for (j = i + 1; j < nrs->rs_nrates; j++) {
if (RV(nrs->rs_rates[i]) > RV(nrs->rs_rates[j])) {
r = nrs->rs_rates[i];
nrs->rs_rates[i] = nrs->rs_rates[j];
nrs->rs_rates[j] = r;
}
}
}
r = nrs->rs_rates[i] & IEEE80211_RATE_VAL;
badrate = r;
if (flags & IEEE80211_F_DOFRATE) {
/*
* Apply fixed rate constraint. Note that we do
* not apply the constraint to basic rates as
* otherwise we may not be able to associate if
* the rate set we submit to the AP is invalid
* (e.g. fix rate at 36Mb/s which is not a basic
* rate for 11a operation).
*/
if ((nrs->rs_rates[i] & IEEE80211_RATE_BASIC) == 0 &&
ic->ic_fixed_rate >= 0 &&
r != RV(srs->rs_rates[ic->ic_fixed_rate]))
ignore++;
}
if (flags & IEEE80211_F_DONEGO) {
/*
* Check against supported rates.
*/
for (j = 0; j < srs->rs_nrates; j++) {
if (r == RV(srs->rs_rates[j]))
break;
}
if (j == srs->rs_nrates) {
/*
* A rate in the node's rate set is not
* supported. If this is a basic rate and we
* are operating as an AP then this is an error.
* Otherwise we just discard/ignore the rate.
* Note that this is important for 11b stations
* when they want to associate with an 11g AP.
*/
if (ic->ic_opmode == IEEE80211_M_HOSTAP &&
(nrs->rs_rates[i] & IEEE80211_RATE_BASIC))
error++;
ignore++;
}
}
if (flags & IEEE80211_F_DODEL) {
/*
* Delete unacceptable rates.
*/
if (ignore) {
nrs->rs_nrates--;
for (j = i; j < nrs->rs_nrates; j++)
nrs->rs_rates[j] = nrs->rs_rates[j + 1];
nrs->rs_rates[j] = 0;
continue;
}
}
if (!ignore)
okrate = nrs->rs_rates[i];
i++;
}
if (okrate == 0 || error != 0)
return badrate | IEEE80211_RATE_BASIC;
else
return RV(okrate);
#undef RV
}
static int
ieee80211_newstate(struct ieee80211com *ic, enum ieee80211_state nstate, int mgt)
{
struct ifnet *ifp = &ic->ic_if;
struct ieee80211_node *ni;
enum ieee80211_state ostate;
ostate = ic->ic_state;
IEEE80211_DPRINTF(("%s: %s -> %s\n", __func__,
ieee80211_state_name[ostate], ieee80211_state_name[nstate]));
ic->ic_state = nstate; /* state transition */
ni = ic->ic_bss; /* NB: no reference held */
switch (nstate) {
case IEEE80211_S_INIT:
switch (ostate) {
case IEEE80211_S_INIT:
break;
case IEEE80211_S_RUN:
switch (ic->ic_opmode) {
case IEEE80211_M_STA:
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_DISASSOC,
IEEE80211_REASON_ASSOC_LEAVE);
break;
case IEEE80211_M_HOSTAP:
mtx_lock(&ic->ic_nodelock);
TAILQ_FOREACH(ni, &ic->ic_node, ni_list) {
if (ni->ni_associd == 0)
continue;
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_DISASSOC,
IEEE80211_REASON_ASSOC_LEAVE);
}
mtx_unlock(&ic->ic_nodelock);
break;
default:
break;
}
/* FALLTHRU */
case IEEE80211_S_ASSOC:
switch (ic->ic_opmode) {
case IEEE80211_M_STA:
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_DEAUTH,
IEEE80211_REASON_AUTH_LEAVE);
break;
case IEEE80211_M_HOSTAP:
mtx_lock(&ic->ic_nodelock);
TAILQ_FOREACH(ni, &ic->ic_node, ni_list) {
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_DEAUTH,
IEEE80211_REASON_AUTH_LEAVE);
}
mtx_unlock(&ic->ic_nodelock);
break;
default:
break;
}
/* FALLTHRU */
case IEEE80211_S_AUTH:
case IEEE80211_S_SCAN:
ic->ic_mgt_timer = 0;
IF_DRAIN(&ic->ic_mgtq);
if (ic->ic_wep_ctx != NULL) {
free(ic->ic_wep_ctx, M_DEVBUF);
ic->ic_wep_ctx = NULL;
}
ieee80211_free_allnodes(ic);
break;
}
break;
case IEEE80211_S_SCAN:
ic->ic_flags &= ~IEEE80211_F_SIBSS;
/* initialize bss for probe request */
IEEE80211_ADDR_COPY(ni->ni_macaddr, ifp->if_broadcastaddr);
IEEE80211_ADDR_COPY(ni->ni_bssid, ifp->if_broadcastaddr);
ni->ni_rates = ic->ic_sup_rates[
ieee80211_chan2mode(ic, ni->ni_chan)];
ni->ni_associd = 0;
ni->ni_rstamp = 0;
switch (ostate) {
case IEEE80211_S_INIT:
if (ic->ic_opmode == IEEE80211_M_HOSTAP &&
ic->ic_des_chan != IEEE80211_CHAN_ANYC) {
/*
* AP operation and we already have a channel;
* bypass the scan and startup immediately.
*/
ieee80211_create_ibss(ic, ic->ic_des_chan);
} else {
ieee80211_begin_scan(ifp);
}
break;
case IEEE80211_S_SCAN:
/* scan next */
if (ic->ic_flags & IEEE80211_F_ASCAN) {
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_PROBE_REQ, 0);
}
break;
case IEEE80211_S_RUN:
/* beacon miss */
if (ifp->if_flags & IFF_DEBUG) {
/* XXX bssid clobbered above */
if_printf(ifp, "no recent beacons from %s;"
" rescanning\n",
ether_sprintf(ic->ic_bss->ni_bssid));
}
ieee80211_free_allnodes(ic);
/* FALLTHRU */
case IEEE80211_S_AUTH:
case IEEE80211_S_ASSOC:
/* timeout restart scan */
ni = ieee80211_find_node(ic, ic->ic_bss->ni_macaddr);
if (ni != NULL) {
ni->ni_fails++;
ieee80211_unref_node(&ni);
}
ieee80211_begin_scan(ifp);
break;
}
break;
case IEEE80211_S_AUTH:
switch (ostate) {
case IEEE80211_S_INIT:
IEEE80211_DPRINTF(("%s: invalid transition\n",
__func__));
break;
case IEEE80211_S_SCAN:
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_AUTH, 1);
break;
case IEEE80211_S_AUTH:
case IEEE80211_S_ASSOC:
switch (mgt) {
case IEEE80211_FC0_SUBTYPE_AUTH:
/* ??? */
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_AUTH, 2);
break;
case IEEE80211_FC0_SUBTYPE_DEAUTH:
/* ignore and retry scan on timeout */
break;
}
break;
case IEEE80211_S_RUN:
switch (mgt) {
case IEEE80211_FC0_SUBTYPE_AUTH:
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_AUTH, 2);
ic->ic_state = ostate; /* stay RUN */
break;
case IEEE80211_FC0_SUBTYPE_DEAUTH:
/* try to reauth */
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_AUTH, 1);
break;
}
break;
}
break;
case IEEE80211_S_ASSOC:
switch (ostate) {
case IEEE80211_S_INIT:
case IEEE80211_S_SCAN:
case IEEE80211_S_ASSOC:
IEEE80211_DPRINTF(("%s: invalid transition\n",
__func__));
break;
case IEEE80211_S_AUTH:
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
break;
case IEEE80211_S_RUN:
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 1);
break;
}
break;
case IEEE80211_S_RUN:
switch (ostate) {
case IEEE80211_S_INIT:
case IEEE80211_S_AUTH:
case IEEE80211_S_RUN:
IEEE80211_DPRINTF(("%s: invalid transition\n",
__func__));
break;
case IEEE80211_S_SCAN: /* adhoc/hostap mode */
case IEEE80211_S_ASSOC: /* infra mode */
KASSERT(ni->ni_txrate < ni->ni_rates.rs_nrates,
("%s: bogus xmit rate %u setup\n", __func__,
ni->ni_txrate));
if (ifp->if_flags & IFF_DEBUG) {
if_printf(ifp, " ");
if (ic->ic_opmode == IEEE80211_M_STA)
printf("associated ");
else
printf("synchronized ");
printf("with %s ssid ",
ether_sprintf(ni->ni_bssid));
ieee80211_print_essid(ic->ic_bss->ni_essid,
ni->ni_esslen);
printf(" channel %d start %uMb\n",
ieee80211_chan2ieee(ic, ni->ni_chan),
IEEE80211_RATE2MBS(ni->ni_rates.rs_rates[ni->ni_txrate]));
}
ic->ic_mgt_timer = 0;
(*ifp->if_start)(ifp);
break;
}
break;
}
return 0;
}
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