OpenBSD-4.6/sys/net80211/ieee80211_proto.c
/* $OpenBSD: ieee80211_proto.c,v 1.40 2009/03/26 20:34:54 damien Exp $ */
/* $NetBSD: ieee80211_proto.c,v 1.8 2004/04/30 23:58:20 dyoung Exp $ */
/*-
* Copyright (c) 2001 Atsushi Onoe
* Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting
* Copyright (c) 2008, 2009 Damien Bergamini
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* IEEE 802.11 protocol support.
*/
#include "bpfilter.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/endian.h>
#include <sys/errno.h>
#include <sys/proc.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/if_arp.h>
#include <net/if_llc.h>
#if NBPFILTER > 0
#include <net/bpf.h>
#endif
#ifdef INET
#include <netinet/in.h>
#include <netinet/if_ether.h>
#endif
#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_priv.h>
#include <dev/rndvar.h>
const char * const 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", "action", "action_noack", "reserved#15"
};
const char * const 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 */
};
const char * const ieee80211_phymode_name[] = {
"auto", /* IEEE80211_MODE_AUTO */
"11a", /* IEEE80211_MODE_11A */
"11b", /* IEEE80211_MODE_11B */
"11g", /* IEEE80211_MODE_11G */
"turbo", /* IEEE80211_MODE_TURBO */
};
int ieee80211_newstate(struct ieee80211com *, enum ieee80211_state, int);
void ieee80211_set_link_state(struct ieee80211com *, 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 */
ic->ic_protmode = IEEE80211_PROT_CTSONLY;
/* 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_PURGE(&ic->ic_mgtq);
IF_PURGE(&ic->ic_pwrsaveq);
}
void
ieee80211_print_essid(const u_int8_t *essid, int len)
{
int i;
const 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);
}
}
#ifdef IEEE80211_DEBUG
void
ieee80211_dump_pkt(const 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(" %d%sM", rate / 2, (rate & 1) ? ".5" : "");
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");
}
}
#endif
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, fixedrate;
const struct ieee80211_rateset *srs;
struct ieee80211_rateset *nrs;
u_int8_t r;
/*
* If the fixed rate check was requested but no fixed rate has been
* defined then just remove the check.
*/
if ((flags & IEEE80211_F_DOFRATE) && ic->ic_fixed_rate == -1)
flags &= ~IEEE80211_F_DOFRATE;
error = 0;
okrate = badrate = fixedrate = 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) {
/*
* Check fixed rate is included.
*/
if (r == RV(srs->rs_rates[ic->ic_fixed_rate]))
fixedrate = r;
}
if (flags & IEEE80211_F_DONEGO) {
/*
* Check against supported rates.
*/
for (j = 0; j < srs->rs_nrates; j++) {
if (r == RV(srs->rs_rates[j])) {
/*
* Overwrite with the supported rate
* value so any basic rate bit is set.
* This insures that response we send
* to stations have the necessary basic
* rate bit set.
*/
nrs->rs_rates[i] = 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.
*/
#ifndef IEEE80211_STA_ONLY
if (ic->ic_opmode == IEEE80211_M_HOSTAP &&
(nrs->rs_rates[i] & IEEE80211_RATE_BASIC))
error++;
#endif
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 ||
((flags & IEEE80211_F_DOFRATE) && fixedrate == 0))
return badrate | IEEE80211_RATE_BASIC;
else
return RV(okrate);
#undef RV
}
/*
* Reset 11g-related state.
*/
void
ieee80211_reset_erp(struct ieee80211com *ic)
{
ic->ic_flags &= ~IEEE80211_F_USEPROT;
ic->ic_nonerpsta = 0;
ic->ic_longslotsta = 0;
/*
* Enable short slot time iff:
* - we're operating in 802.11a or
* - we're operating in 802.11g and we're not in IBSS mode and
* the device supports short slot time
*/
ieee80211_set_shortslottime(ic,
ic->ic_curmode == IEEE80211_MODE_11A
#ifndef IEEE80211_STA_ONLY
||
(ic->ic_curmode == IEEE80211_MODE_11G &&
ic->ic_opmode == IEEE80211_M_HOSTAP &&
(ic->ic_caps & IEEE80211_C_SHSLOT))
#endif
);
if (ic->ic_curmode == IEEE80211_MODE_11A ||
(ic->ic_caps & IEEE80211_C_SHPREAMBLE))
ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
else
ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
}
/*
* Set the short slot time state and notify the driver.
*/
void
ieee80211_set_shortslottime(struct ieee80211com *ic, int on)
{
if (on)
ic->ic_flags |= IEEE80211_F_SHSLOT;
else
ic->ic_flags &= ~IEEE80211_F_SHSLOT;
/* notify the driver */
if (ic->ic_updateslot != NULL)
ic->ic_updateslot(ic);
}
/*
* This function is called by the 802.1X PACP machine (via an ioctl) when
* the transmit key machine (4-Way Handshake for 802.11) should run.
*/
int
ieee80211_keyrun(struct ieee80211com *ic, u_int8_t *macaddr)
{
#ifndef IEEE80211_STA_ONLY
struct ieee80211_node *ni;
struct ieee80211_pmk *pmk;
#endif
/* STA must be associated or AP must be ready */
if (ic->ic_state != IEEE80211_S_RUN ||
!(ic->ic_flags & IEEE80211_F_RSNON))
return ENETDOWN;
#ifndef IEEE80211_STA_ONLY
if (ic->ic_opmode == IEEE80211_M_STA)
#endif
return 0; /* supplicant only, do nothing */
#ifndef IEEE80211_STA_ONLY
/* find the STA with which we must start the key exchange */
if ((ni = ieee80211_find_node(ic, macaddr)) == NULL) {
DPRINTF(("no node found for %s\n", ether_sprintf(macaddr)));
return EINVAL;
}
/* check that the STA is in the correct state */
if (ni->ni_state != IEEE80211_STA_ASSOC ||
ni->ni_rsn_state != RSNA_AUTHENTICATION_2) {
DPRINTF(("unexpected in state %d\n", ni->ni_rsn_state));
return EINVAL;
}
ni->ni_rsn_state = RSNA_INITPMK;
/* make sure a PMK is available for this STA, otherwise deauth it */
if ((pmk = ieee80211_pmksa_find(ic, ni, NULL)) == NULL) {
DPRINTF(("no PMK available for %s\n", ether_sprintf(macaddr)));
IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_DEAUTH,
IEEE80211_REASON_AUTH_LEAVE);
ieee80211_node_leave(ic, ni);
return EINVAL;
}
memcpy(ni->ni_pmk, pmk->pmk_key, IEEE80211_PMK_LEN);
memcpy(ni->ni_pmkid, pmk->pmk_pmkid, IEEE80211_PMKID_LEN);
ni->ni_flags |= IEEE80211_NODE_PMK;
/* initiate key exchange (4-Way Handshake) with STA */
return ieee80211_send_4way_msg1(ic, ni);
#endif /* IEEE80211_STA_ONLY */
}
#ifndef IEEE80211_STA_ONLY
/*
* Initiate a group key handshake with a node.
*/
static void
ieee80211_node_gtk_rekey(void *arg, struct ieee80211_node *ni)
{
struct ieee80211com *ic = arg;
if (ni->ni_state != IEEE80211_STA_ASSOC ||
ni->ni_rsn_gstate != RSNA_IDLE)
return;
/* initiate a group key handshake with STA */
if (ieee80211_send_group_msg1(ic, ni) == 0) {
ni->ni_flags |= IEEE80211_NODE_REKEY;
ic->ic_rsn_keydonesta++;
}
}
/*
* This function is called in HostAP mode when the group key needs to be
* changed.
*/
void
ieee80211_setkeys(struct ieee80211com *ic)
{
struct ieee80211_key *k;
u_int8_t kid;
/* Swap(GM, GN) */
kid = (ic->ic_def_txkey == 1) ? 2 : 1;
k = &ic->ic_nw_keys[kid];
memset(k, 0, sizeof(*k));
k->k_id = kid;
k->k_cipher = ic->ic_bss->ni_rsngroupcipher;
k->k_flags = IEEE80211_KEY_GROUP | IEEE80211_KEY_TX;
k->k_len = ieee80211_cipher_keylen(k->k_cipher);
arc4random_buf(k->k_key, k->k_len);
if (ic->ic_caps & IEEE80211_C_MFP) {
/* Swap(GM_igtk, GN_igtk) */
kid = (ic->ic_igtk_kid == 4) ? 5 : 4;
k = &ic->ic_nw_keys[kid];
memset(k, 0, sizeof(*k));
k->k_id = kid;
k->k_cipher = ic->ic_bss->ni_rsngroupmgmtcipher;
k->k_flags = IEEE80211_KEY_IGTK | IEEE80211_KEY_TX;
k->k_len = 16;
arc4random_buf(k->k_key, k->k_len);
}
ic->ic_rsn_keydonesta = 0;
ieee80211_iterate_nodes(ic, ieee80211_node_gtk_rekey, ic);
}
/*
* The group key handshake has been completed with all associated stations.
*/
void
ieee80211_setkeysdone(struct ieee80211com *ic)
{
u_int8_t kid;
/* install GTK */
kid = (ic->ic_def_txkey == 1) ? 2 : 1;
if ((*ic->ic_set_key)(ic, ic->ic_bss, &ic->ic_nw_keys[kid]) == 0)
ic->ic_def_txkey = kid;
if (ic->ic_caps & IEEE80211_C_MFP) {
/* install IGTK */
kid = (ic->ic_igtk_kid == 4) ? 5 : 4;
if ((*ic->ic_set_key)(ic, ic->ic_bss,
&ic->ic_nw_keys[kid]) == 0)
ic->ic_igtk_kid = kid;
}
}
/*
* Group key lifetime has expired, update it.
*/
void
ieee80211_gtk_rekey_timeout(void *arg)
{
struct ieee80211com *ic = arg;
int s;
s = splnet();
ieee80211_setkeys(ic);
splx(s);
/* re-schedule a GTK rekeying after 3600s */
timeout_add_sec(&ic->ic_rsn_timeout, 3600);
}
void
ieee80211_sa_query_timeout(void *arg)
{
struct ieee80211_node *ni = arg;
struct ieee80211com *ic = ni->ni_ic;
int s;
s = splnet();
if (++ni->ni_sa_query_count >= 3) {
ni->ni_flags &= ~IEEE80211_NODE_SA_QUERY;
ni->ni_flags |= IEEE80211_NODE_SA_QUERY_FAILED;
} else /* retry SA Query Request */
ieee80211_sa_query_request(ic, ni);
splx(s);
}
/*
* Request that a SA Query Request frame be sent to a specified peer STA
* to which the STA is associated.
*/
void
ieee80211_sa_query_request(struct ieee80211com *ic, struct ieee80211_node *ni)
{
/* MLME-SAQuery.request */
if (!(ni->ni_flags & IEEE80211_NODE_SA_QUERY)) {
ni->ni_flags |= IEEE80211_NODE_SA_QUERY;
ni->ni_flags &= ~IEEE80211_NODE_SA_QUERY_FAILED;
ni->ni_sa_query_count = 0;
}
/* generate new Transaction Identifier */
ni->ni_sa_query_trid++;
/* send SA Query Request */
IEEE80211_SEND_ACTION(ic, ni, IEEE80211_CATEG_SA_QUERY,
IEEE80211_ACTION_SA_QUERY_REQ, 0);
timeout_add_msec(&ni->ni_sa_query_to, 10);
}
#endif /* IEEE80211_STA_ONLY */
#ifndef IEEE80211_NO_HT
void
ieee80211_tx_ba_timeout(void *arg)
{
struct ieee80211_tx_ba *ba = arg;
struct ieee80211_node *ni = ba->ba_ni;
struct ieee80211com *ic = ni->ni_ic;
u_int8_t tid;
int s;
s = splnet();
if (ba->ba_state == IEEE80211_BA_REQUESTED) {
/* MLME-ADDBA.confirm(TIMEOUT) */
ba->ba_state = IEEE80211_BA_INIT;
} else if (ba->ba_state == IEEE80211_BA_AGREED) {
/* Block Ack inactivity timeout */
tid = ((caddr_t)ba - (caddr_t)ni->ni_tx_ba) / sizeof(*ba);
ieee80211_delba_request(ic, ni, IEEE80211_REASON_TIMEOUT,
1, tid);
}
splx(s);
}
void
ieee80211_rx_ba_timeout(void *arg)
{
struct ieee80211_rx_ba *ba = arg;
struct ieee80211_node *ni = ba->ba_ni;
struct ieee80211com *ic = ni->ni_ic;
u_int8_t tid;
int s;
s = splnet();
/* Block Ack inactivity timeout */
tid = ((caddr_t)ba - (caddr_t)ni->ni_rx_ba) / sizeof(*ba);
ieee80211_delba_request(ic, ni, IEEE80211_REASON_TIMEOUT, 0, tid);
splx(s);
}
/*
* Request initiation of Block Ack with the specified peer.
*/
int
ieee80211_addba_request(struct ieee80211com *ic, struct ieee80211_node *ni,
u_int16_t ssn, u_int8_t tid)
{
struct ieee80211_tx_ba *ba = &ni->ni_tx_ba[tid];
/* MLME-ADDBA.request */
/* setup Block Ack */
ba->ba_state = IEEE80211_BA_REQUESTED;
ba->ba_token = ic->ic_dialog_token++;
ba->ba_timeout_val = IEEE80211_BA_MAX_TIMEOUT;
timeout_set(&ba->ba_to, ieee80211_tx_ba_timeout, ba);
ba->ba_winsize = IEEE80211_BA_MAX_WINSZ;
ba->ba_winstart = ssn;
ba->ba_winend = (ba->ba_winstart + ba->ba_winsize - 1) & 0xfff;
timeout_add_sec(&ba->ba_to, 1); /* dot11ADDBAResponseTimeout */
IEEE80211_SEND_ACTION(ic, ni, IEEE80211_CATEG_BA,
IEEE80211_ACTION_ADDBA_REQ, tid);
return 0;
}
/*
* Request the deletion of Block Ack with a peer.
*/
void
ieee80211_delba_request(struct ieee80211com *ic, struct ieee80211_node *ni,
u_int16_t reason, u_int8_t dir, u_int8_t tid)
{
/* MLME-DELBA.request */
/* transmit a DELBA frame */
IEEE80211_SEND_ACTION(ic, ni, IEEE80211_CATEG_BA,
IEEE80211_ACTION_DELBA, reason << 16 | dir << 8 | tid);
if (dir) {
/* MLME-DELBA.confirm(Originator) */
struct ieee80211_tx_ba *ba = &ni->ni_tx_ba[tid];
if (ic->ic_ampdu_tx_stop != NULL)
ic->ic_ampdu_tx_stop(ic, ni, tid);
ba->ba_state = IEEE80211_BA_INIT;
/* stop Block Ack inactivity timer */
timeout_del(&ba->ba_to);
} else {
/* MLME-DELBA.confirm(Recipient) */
struct ieee80211_rx_ba *ba = &ni->ni_rx_ba[tid];
int i;
if (ic->ic_ampdu_rx_stop != NULL)
ic->ic_ampdu_rx_stop(ic, ni, tid);
ba->ba_state = IEEE80211_BA_INIT;
/* stop Block Ack inactivity timer */
timeout_del(&ba->ba_to);
if (ba->ba_buf != NULL) {
/* free all MSDUs stored in reordering buffer */
for (i = 0; i < IEEE80211_BA_MAX_WINSZ; i++)
if (ba->ba_buf[i].m != NULL)
m_freem(ba->ba_buf[i].m);
/* free reordering buffer */
free(ba->ba_buf, M_DEVBUF);
ba->ba_buf = NULL;
}
}
}
#endif /* !IEEE80211_NO_HT */
void
ieee80211_auth_open(struct ieee80211com *ic, const struct ieee80211_frame *wh,
struct ieee80211_node *ni, struct ieee80211_rxinfo *rxi, u_int16_t seq,
u_int16_t status)
{
struct ifnet *ifp = &ic->ic_if;
switch (ic->ic_opmode) {
#ifndef IEEE80211_STA_ONLY
case IEEE80211_M_IBSS:
if (ic->ic_state != IEEE80211_S_RUN ||
seq != IEEE80211_AUTH_OPEN_REQUEST) {
DPRINTF(("discard auth from %s; state %u, seq %u\n",
ether_sprintf((u_int8_t *)wh->i_addr2),
ic->ic_state, seq));
ic->ic_stats.is_rx_bad_auth++;
return;
}
ieee80211_new_state(ic, IEEE80211_S_AUTH,
wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK);
break;
case IEEE80211_M_AHDEMO:
/* should not come here */
break;
case IEEE80211_M_HOSTAP:
if (ic->ic_state != IEEE80211_S_RUN ||
seq != IEEE80211_AUTH_OPEN_REQUEST) {
DPRINTF(("discard auth from %s; state %u, seq %u\n",
ether_sprintf((u_int8_t *)wh->i_addr2),
ic->ic_state, seq));
ic->ic_stats.is_rx_bad_auth++;
return;
}
if (ni == ic->ic_bss) {
ni = ieee80211_alloc_node(ic, wh->i_addr2);
if (ni == NULL) {
ic->ic_stats.is_rx_nodealloc++;
return;
}
IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_bss->ni_bssid);
ni->ni_rssi = rxi->rxi_rssi;
ni->ni_rstamp = rxi->rxi_tstamp;
ni->ni_chan = ic->ic_bss->ni_chan;
}
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
if (ifp->if_flags & IFF_DEBUG)
printf("%s: station %s %s authenticated (open)\n",
ifp->if_xname,
ether_sprintf((u_int8_t *)ni->ni_macaddr),
ni->ni_state != IEEE80211_STA_CACHE ?
"newly" : "already");
ieee80211_node_newstate(ni, IEEE80211_STA_AUTH);
break;
#endif /* IEEE80211_STA_ONLY */
case IEEE80211_M_STA:
if (ic->ic_state != IEEE80211_S_AUTH ||
seq != IEEE80211_AUTH_OPEN_RESPONSE) {
ic->ic_stats.is_rx_bad_auth++;
DPRINTF(("discard auth from %s; state %u, seq %u\n",
ether_sprintf((u_int8_t *)wh->i_addr2),
ic->ic_state, seq));
return;
}
if (ic->ic_flags & IEEE80211_F_RSNON) {
/* XXX not here! */
ic->ic_bss->ni_flags &= ~IEEE80211_NODE_TXRXPROT;
ic->ic_bss->ni_port_valid = 0;
ic->ic_bss->ni_replaycnt_ok = 0;
(*ic->ic_delete_key)(ic, ic->ic_bss,
&ic->ic_bss->ni_pairwise_key);
}
if (status != 0) {
if (ifp->if_flags & IFF_DEBUG)
printf("%s: open authentication failed "
"(reason %d) for %s\n", ifp->if_xname,
status,
ether_sprintf((u_int8_t *)wh->i_addr3));
if (ni != ic->ic_bss)
ni->ni_fails++;
ic->ic_stats.is_rx_auth_fail++;
return;
}
ieee80211_new_state(ic, IEEE80211_S_ASSOC,
wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK);
break;
default:
break;
}
}
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;
u_int rate;
#ifndef IEEE80211_STA_ONLY
int s;
#endif
ostate = ic->ic_state;
DPRINTF(("%s -> %s\n", ieee80211_state_name[ostate],
ieee80211_state_name[nstate]));
ic->ic_state = nstate; /* state transition */
ni = ic->ic_bss; /* NB: no reference held */
if (ostate == IEEE80211_S_RUN)
ieee80211_set_link_state(ic, LINK_STATE_DOWN);
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;
#ifndef IEEE80211_STA_ONLY
case IEEE80211_M_HOSTAP:
s = splnet();
RB_FOREACH(ni, ieee80211_tree, &ic->ic_tree) {
if (ni->ni_associd == 0)
continue;
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_DISASSOC,
IEEE80211_REASON_ASSOC_LEAVE);
}
splx(s);
break;
#endif
default:
break;
}
/* FALLTHROUGH */
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;
#ifndef IEEE80211_STA_ONLY
case IEEE80211_M_HOSTAP:
s = splnet();
RB_FOREACH(ni, ieee80211_tree, &ic->ic_tree) {
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_DEAUTH,
IEEE80211_REASON_AUTH_LEAVE);
}
splx(s);
break;
#endif
default:
break;
}
/* FALLTHROUGH */
case IEEE80211_S_AUTH:
case IEEE80211_S_SCAN:
#ifndef IEEE80211_STA_ONLY
if (ic->ic_opmode == IEEE80211_M_HOSTAP)
timeout_del(&ic->ic_rsn_timeout);
#endif
ic->ic_mgt_timer = 0;
IF_PURGE(&ic->ic_mgtq);
IF_PURGE(&ic->ic_pwrsaveq);
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, etherbroadcastaddr);
IEEE80211_ADDR_COPY(ni->ni_bssid, etherbroadcastaddr);
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:
#ifndef IEEE80211_STA_ONLY
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
#endif
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 */
printf("%s: no recent beacons from %s;"
" rescanning\n", ifp->if_xname,
ether_sprintf(ic->ic_bss->ni_bssid));
}
ieee80211_free_allnodes(ic);
/* FALLTHROUGH */
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_begin_scan(ifp);
break;
}
break;
case IEEE80211_S_AUTH:
switch (ostate) {
case IEEE80211_S_INIT:
DPRINTF(("invalid transition\n"));
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:
DPRINTF(("invalid transition\n"));
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:
ieee80211_set_link_state(ic, LINK_STATE_UP);
switch (ostate) {
case IEEE80211_S_INIT:
case IEEE80211_S_AUTH:
case IEEE80211_S_RUN:
DPRINTF(("invalid transition\n"));
break;
case IEEE80211_S_SCAN: /* adhoc/hostap mode */
case IEEE80211_S_ASSOC: /* infra mode */
if (ni->ni_txrate >= ni->ni_rates.rs_nrates)
panic("%s: bogus xmit rate %u setup\n",
__func__, ni->ni_txrate);
if (ifp->if_flags & IFF_DEBUG) {
printf("%s: %s with %s ssid ",
ifp->if_xname,
ic->ic_opmode == IEEE80211_M_STA ?
"associated" : "synchronized",
ether_sprintf(ni->ni_bssid));
ieee80211_print_essid(ic->ic_bss->ni_essid,
ni->ni_esslen);
rate = ni->ni_rates.rs_rates[ni->ni_txrate] &
IEEE80211_RATE_VAL;
printf(" channel %d start %u%sMb",
ieee80211_chan2ieee(ic, ni->ni_chan),
rate / 2, (rate & 1) ? ".5" : "");
printf(" %s preamble %s slot time%s\n",
(ic->ic_flags & IEEE80211_F_SHPREAMBLE) ?
"short" : "long",
(ic->ic_flags & IEEE80211_F_SHSLOT) ?
"short" : "long",
(ic->ic_flags & IEEE80211_F_USEPROT) ?
" protection enabled" : "");
}
ic->ic_mgt_timer = 0;
(*ifp->if_start)(ifp);
break;
}
break;
}
return 0;
}
void
ieee80211_set_link_state(struct ieee80211com *ic, int nstate)
{
struct ifnet *ifp = &ic->ic_if;
switch (ic->ic_opmode) {
#ifndef IEEE80211_STA_ONLY
case IEEE80211_M_IBSS:
case IEEE80211_M_HOSTAP:
nstate = LINK_STATE_UNKNOWN;
break;
#endif
case IEEE80211_M_MONITOR:
nstate = LINK_STATE_DOWN;
break;
default:
break;
}
if (nstate != ifp->if_link_state) {
ifp->if_link_state = nstate;
if_link_state_change(ifp);
}
}