/
ieee80211_proto.c
1347 lines (1237 loc) · 37.1 KB
/
ieee80211_proto.c
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/*
* Copyright (C) 2020 钟先耀
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
/* $OpenBSD: ieee80211_proto.c,v 1.95 2019/09/02 12:54:21 stsp 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 <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/sysctl.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/if_llc.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_priv.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 */
"11n", /* IEEE80211_MODE_11N */
"11ac", /* IEEE80211_MODE_11AC */
};
void ieee80211_set_beacon_miss_threshold(struct ieee80211com *);
int ieee80211_newstate(struct ieee80211com *, enum ieee80211_state, int);
void
ieee80211_proto_attach(struct _ifnet *ifp)
{
struct ieee80211com *ic = (struct ieee80211com *)ifp;
mq_init(&ic->ic_mgtq, IFQ_MAXLEN, IPL_NET);
mq_init(&ic->ic_pwrsaveq, IFQ_MAXLEN, IPL_NET);
ifp->if_hdrlen = sizeof(struct ieee80211_frame);
ic->ic_rtsthreshold = IEEE80211_RTS_MAX;
ic->ic_fragthreshold = 2346; /* XXX not used yet */
ic->ic_fixed_rate = -1; /* no fixed rate */
ic->ic_fixed_mcs = -1; /* no fixed mcs */
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)
{
XYLog("%s\n", __FUNCTION__);
struct ieee80211com *ic = (struct ieee80211com *)ifp;
mq_purge(&ic->ic_mgtq);
mq_purge(&ic->ic_pwrsaveq);
}
void
ieee80211_print_essid(const u_int8_t *essid, int len)
{
int i;
const u_int8_t *p;
XYLog("%s\n", essid);
// 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) {
// XYLog("\"");
// for (i = 0, p = essid; i < len; i++, p++)
// XYLog("%c", *p);
// XYLog("\"");
// } else {
// XYLog("0x");
// for (i = 0, p = essid; i < len; i++, p++)
// XYLog("%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:
XYLog("NODS %s", ether_sprintf(wh->i_addr2));
XYLog("->%s", ether_sprintf(wh->i_addr1));
XYLog("(%s)", ether_sprintf(wh->i_addr3));
break;
case IEEE80211_FC1_DIR_TODS:
XYLog("TODS %s", ether_sprintf(wh->i_addr2));
XYLog("->%s", ether_sprintf(wh->i_addr3));
XYLog("(%s)", ether_sprintf(wh->i_addr1));
break;
case IEEE80211_FC1_DIR_FROMDS:
XYLog("FRDS %s", ether_sprintf(wh->i_addr3));
XYLog("->%s", ether_sprintf(wh->i_addr1));
XYLog("(%s)", ether_sprintf(wh->i_addr2));
break;
case IEEE80211_FC1_DIR_DSTODS:
XYLog("DSDS %s", ether_sprintf((u_int8_t *)&wh[1]));
XYLog("->%s", ether_sprintf(wh->i_addr3));
XYLog("(%s", ether_sprintf(wh->i_addr2));
XYLog("->%s)", ether_sprintf(wh->i_addr1));
break;
}
switch (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) {
case IEEE80211_FC0_TYPE_DATA:
XYLog(" data");
break;
case IEEE80211_FC0_TYPE_MGT:
XYLog(" %s", ieee80211_mgt_subtype_name[
(wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK)
>> IEEE80211_FC0_SUBTYPE_SHIFT]);
break;
default:
XYLog(" type#%d", wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK);
break;
}
if (wh->i_fc[1] & IEEE80211_FC1_WEP)
XYLog(" WEP");
if (rate >= 0)
XYLog(" %d%sM", rate / 2, (rate & 1) ? ".5" : "");
if (rssi >= 0)
XYLog(" +%d", rssi);
XYLog("\n");
if (len > 0) {
for (i = 0; i < len; i++) {
if ((i & 1) == 0)
XYLog(" ");
XYLog("%02x", buf[i]);
}
XYLog("\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;
ieee80211_set_shortslottime(ic,
ic->ic_curmode == IEEE80211_MODE_11A ||
(ic->ic_curmode == IEEE80211_MODE_11N &&
IEEE80211_IS_CHAN_5GHZ(ic->ic_ibss_chan))
#ifndef IEEE80211_STA_ONLY
||
((ic->ic_curmode == IEEE80211_MODE_11G ||
(ic->ic_curmode == IEEE80211_MODE_11N &&
IEEE80211_IS_CHAN_2GHZ(ic->ic_ibss_chan))) &&
ic->ic_opmode == IEEE80211_M_HOSTAP &&
(ic->ic_caps & IEEE80211_C_SHSLOT))
#endif
);
if (ic->ic_curmode == IEEE80211_MODE_11A ||
(ic->ic_curmode == IEEE80211_MODE_11N &&
IEEE80211_IS_CHAN_5GHZ(ic->ic_ibss_chan)) ||
(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)
{
XYLog("%s\n", __FUNCTION__);
struct ieee80211_node *ni = ic->ic_bss;
#ifndef IEEE80211_STA_ONLY
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;
ni->ni_rsn_supp_state = RSNA_SUPP_PTKSTART;
#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 = (struct ieee80211com *)arg;
if (ni->ni_state != IEEE80211_STA_ASSOC ||
ni->ni_rsn_gstate != RSNA_IDLE)
return;
/* initiate a group key handshake with STA */
ni->ni_flags |= IEEE80211_NODE_REKEY;
if (ieee80211_send_group_msg1(ic, ni) != 0)
ni->ni_flags &= ~IEEE80211_NODE_REKEY;
}
/*
* 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;
int rekeysta = 0;
/* 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);
}
ieee80211_iterate_nodes(ic, ieee80211_node_gtk_rekey, ic);
ieee80211_iterate_nodes(ic, ieee80211_count_rekeysta, &rekeysta);
if (rekeysta == 0)
ieee80211_setkeysdone(ic);
}
/*
* The group key handshake has been completed with all associated stations.
*/
void
ieee80211_setkeysdone(struct ieee80211com *ic)
{
u_int8_t kid;
/*
* Discard frames buffered for power-saving which were encrypted with
* the old group key. Clients are no longer able to decrypt them.
*/
mq_purge(&ic->ic_bss->ni_savedq);
/* 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 = (struct ieee80211com *)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 = (struct ieee80211_node *)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 */
void
ieee80211_ht_negotiate(struct ieee80211com *ic, struct ieee80211_node *ni)
{
int i;
ni->ni_flags &= ~(IEEE80211_NODE_HT | IEEE80211_NODE_HT_SGI20 |
IEEE80211_NODE_HT_SGI40);
/* Check if we support HT. */
if ((ic->ic_modecaps & (1 << IEEE80211_MODE_11N)) == 0)
return;
/* Check if HT support has been explicitly disabled. */
if ((ic->ic_flags & IEEE80211_F_HTON) == 0)
return;
/*
* Check if the peer supports HT.
* Require at least one of the mandatory MCS.
* MCS 0-7 are mandatory but some APs have particular MCS disabled.
*/
if (!ieee80211_node_supports_ht(ni)) {
ic->ic_stats.is_ht_nego_no_mandatory_mcs++;
return;
}
if (ic->ic_opmode == IEEE80211_M_STA) {
/* We must support the AP's basic MCS set. */
for (i = 0; i < IEEE80211_HT_NUM_MCS; i++) {
if (isset(ni->ni_basic_mcs, i) &&
!isset(ic->ic_sup_mcs, i)) {
ic->ic_stats.is_ht_nego_no_basic_mcs++;
return;
}
}
}
/*
* Don't allow group cipher (includes WEP) or TKIP
* for pairwise encryption (see 802.11-2012 11.1.6).
*/
if (ic->ic_flags & IEEE80211_F_WEPON) {
ic->ic_stats.is_ht_nego_bad_crypto++;
return;
}
if ((ic->ic_flags & IEEE80211_F_RSNON) &&
(ni->ni_rsnciphers & IEEE80211_CIPHER_USEGROUP ||
ni->ni_rsnciphers & IEEE80211_CIPHER_TKIP)) {
ic->ic_stats.is_ht_nego_bad_crypto++;
return;
}
ni->ni_flags |= IEEE80211_NODE_HT;
/* Flags IEEE8021_NODE_HT_SGI20/40 are set by drivers if supported. */
}
void
ieee80211_tx_ba_timeout(void *arg)
{
struct ieee80211_tx_ba *ba = (struct ieee80211_tx_ba *)arg;
struct ieee80211_node *ni = ba->ba_ni;
struct ieee80211com *ic = ni->ni_ic;
u_int8_t tid;
int s;
s = splnet();
tid = ((caddr_t)ba - (caddr_t)ni->ni_tx_ba) / sizeof(*ba);
if (ba->ba_state == IEEE80211_BA_REQUESTED) {
/* MLME-ADDBA.confirm(TIMEOUT) */
ba->ba_state = IEEE80211_BA_INIT;
if (ni->ni_addba_req_intval[tid] <
IEEE80211_ADDBA_REQ_INTVAL_MAX)
ni->ni_addba_req_intval[tid]++;
/*
* In case the peer believes there is an existing
* block ack agreement with us, try to delete it.
*/
IEEE80211_SEND_ACTION(ic, ni, IEEE80211_CATEG_BA,
IEEE80211_ACTION_DELBA,
IEEE80211_REASON_SETUP_REQUIRED << 16 | 1 << 8 | tid);
} else if (ba->ba_state == IEEE80211_BA_AGREED) {
/* Block Ack inactivity timeout */
ic->ic_stats.is_ht_tx_ba_timeout++;
ieee80211_delba_request(ic, ni, IEEE80211_REASON_TIMEOUT,
1, tid);
}
splx(s);
}
void
ieee80211_rx_ba_timeout(void *arg)
{
struct ieee80211_rx_ba *ba = (struct ieee80211_rx_ba *)arg;
struct ieee80211_node *ni = ba->ba_ni;
struct ieee80211com *ic = ni->ni_ic;
u_int8_t tid;
int s;
ic->ic_stats.is_ht_rx_ba_timeout++;
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];
if (ba->ba_state != IEEE80211_BA_INIT)
return EBUSY;
/* MLME-ADDBA.request */
/* setup Block Ack */
ba->ba_ni = ni;
ba->ba_state = IEEE80211_BA_REQUESTED;
ba->ba_token = ic->ic_dialog_token++;
ba->ba_timeout_val = 0;
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;
ba->ba_params =
(ba->ba_winsize << IEEE80211_ADDBA_BUFSZ_SHIFT) |
(tid << IEEE80211_ADDBA_TID_SHIFT);
#if 0
/*
* XXX A-MSDUs inside A-MPDUs expose a problem with bad TCP connection
* sharing behaviour. One connection eats all available bandwidth
* while others stall. Leave this disabled for now to give packets
* from disparate connections better chances of interleaving.
*/
ba->ba_params |= IEEE80211_ADDBA_AMSDU;
#endif
if ((ic->ic_htcaps & IEEE80211_HTCAP_DELAYEDBA) == 0)
/* immediate BA */
ba->ba_params |= IEEE80211_ADDBA_BA_POLICY;
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 and notify driver.
*/
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 */
if (reason) {
/* 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);
timeout_del(&ba->ba_gap_to);
if (ba->ba_buf != NULL) {
/* free all MSDUs stored in reordering buffer */
for (i = 0; i < IEEE80211_BA_MAX_WINSZ; i++)
mbuf_freem(ba->ba_buf[i].m);
/* free reordering buffer */
IOFree(ba->ba_buf,
IEEE80211_BA_MAX_WINSZ * sizeof(*ba->ba_buf));
ba->ba_buf = NULL;
}
}
}
#ifndef IEEE80211_STA_ONLY
void
ieee80211_auth_open_confirm(struct ieee80211com *ic,
struct ieee80211_node *ni, uint16_t seq)
{
struct _ifnet *ifp = &ic->ic_if;
IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
if (ifp->if_flags & IFF_DEBUG)
XYLog("%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);
}
#endif
void
ieee80211_try_another_bss(struct ieee80211com *ic)
{
XYLog("%s\n", __FUNCTION__);
struct ieee80211_node *curbs, *selbs;
struct _ifnet *ifp = &ic->ic_if;
/* Don't select our current AP again. */
curbs = ieee80211_find_node(ic, ic->ic_bss->ni_macaddr);
if (curbs) {
curbs->ni_fails++;
ieee80211_node_newstate(curbs, IEEE80211_STA_CACHE);
}
/* Try a different AP from the same ESS if available. */
if (ic->ic_caps & IEEE80211_C_SCANALLBAND) {
/*
* Make sure we will consider APs on all bands during
* access point selection in ieee80211_node_choose_bss().
* During multi-band scans, our previous AP may be trying
* to steer us onto another band by denying authentication.
*/
ieee80211_setmode(ic, IEEE80211_MODE_AUTO);
}
selbs = ieee80211_node_choose_bss(ic, 0, NULL);
if (selbs == NULL)
return;
/* Should not happen but seriously, don't try the same AP again. */
if (memcmp(selbs->ni_macaddr, ic->ic_bss->ni_macaddr,
IEEE80211_NWID_LEN) == 0)
return;
if (ifp->if_flags & IFF_DEBUG)
XYLog("%s: trying AP %s on channel %d instead\n",
ifp->if_xname, ether_sprintf(selbs->ni_macaddr),
ieee80211_chan2ieee(ic, selbs->ni_chan));
/* Triggers an AUTH->AUTH transition, avoiding another SCAN. */
ieee80211_node_join_bss(ic, selbs);
}
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)
{
XYLog("%s\n", __FUNCTION__);
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);
/* In IBSS mode no (re)association frames are sent. */
if (ic->ic_flags & IEEE80211_F_RSNON)
ni->ni_rsn_supp_state = RSNA_SUPP_PTKSTART;
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_find_node(ic, wh->i_addr2);
if (ni == NULL)
ni = ieee80211_alloc_node(ic, wh->i_addr2);
if (ni == NULL) {
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;
}
/*
* Drivers may want to set up state before confirming.
* In which case this returns EBUSY and the driver will
* later call ieee80211_auth_open_confirm() by itself.
*/
if (ic->ic_newauth && ic->ic_newauth(ic, ni,
ni->ni_state != IEEE80211_STA_CACHE, seq) != 0)
break;
ieee80211_auth_open_confirm(ic, ni, seq);
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)
XYLog("%s: open authentication failed "
"(status %d) for %s\n", ifp->if_xname,
status,
ether_sprintf((u_int8_t *)wh->i_addr3));
if (ni != ic->ic_bss)
ni->ni_fails++;
else
ieee80211_try_another_bss(ic);
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;
}
}
void
ieee80211_set_beacon_miss_threshold(struct ieee80211com *ic)
{
struct _ifnet *ifp = &ic->ic_if;
/*
* Scale the missed beacon counter threshold to the AP's actual
* beacon interval.
*/
int btimeout = MIN(IEEE80211_BEACON_MISS_THRES * ic->ic_bss->ni_intval,
IEEE80211_BEACON_MISS_THRES * (IEEE80211_DUR_TU / 10));
/* Ensure that at least one beacon may be missed. */
btimeout = MAX(btimeout, 2 * ic->ic_bss->ni_intval);
if (ic->ic_bss->ni_intval > 0) /* don't crash if interval is bogus */
ic->ic_bmissthres = btimeout / ic->ic_bss->ni_intval;
if (ifp->if_flags & IFF_DEBUG)
XYLog("%s: missed beacon threshold set to %d beacons, "
"beacon interval is %u TU\n", ifp->if_xname,
ic->ic_bmissthres, ic->ic_bss->ni_intval);
}
/* Tell our peer, and the driver, to stop A-MPDU Tx for all TIDs. */
void
ieee80211_stop_ampdu_tx(struct ieee80211com *ic, struct ieee80211_node *ni,
int mgt)
{
int tid;
for (tid = 0; tid < nitems(ni->ni_tx_ba); tid++) {
struct ieee80211_tx_ba *ba = &ni->ni_tx_ba[tid];
if (ba->ba_state != IEEE80211_BA_AGREED)
continue;
ieee80211_delba_request(ic, ni,
mgt == -1 ? 0 : IEEE80211_REASON_AUTH_LEAVE, 1, tid);
}
}
void
ieee80211_check_wpa_supplicant_failure(struct ieee80211com *ic,
struct ieee80211_node *ni)
{
struct ieee80211_node *ni2;
if (ic->ic_opmode != IEEE80211_M_STA
#ifndef IEEE80211_STA_ONLY
&& ic->ic_opmode != IEEE80211_M_IBSS
#endif
)
return;
if (ni->ni_rsn_supp_state != RSNA_SUPP_PTKNEGOTIATING)
return;
ni->ni_assoc_fail |= IEEE80211_NODE_ASSOCFAIL_WPA_KEY;
if (ni != ic->ic_bss)
return;
/* Also update the copy of our AP's node in the node cache. */
ni2 = ieee80211_find_node(ic, ic->ic_bss->ni_macaddr);
if (ni2)
ni2->ni_assoc_fail |= ic->ic_bss->ni_assoc_fail;
}
int
ieee80211_newstate(struct ieee80211com *ic, enum ieee80211_state nstate,