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NetBSD/sys/dev/ic/wi_hostap.c

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/* $NetBSD: wi_hostap.c,v 1.1 2002/08/11 06:13:53 thorpej Exp $ */
/* $OpenBSD: if_wi_hostap.c,v 1.19 2002/06/25 01:59:52 millert Exp $ */
/*
* Copyright (c) 2002
* Thomas Skibo <skibo@pacbell.net>. 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Thomas Skibo.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY Thomas Skibo AND CONTRIBUTORS ``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 Thomas Skibo OR HIS DRINKING PALS
* 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.
*/
/*
* This is experimental Host AP software for Prism 2 802.11b interfaces.
*
* Much of this is based upon the "Linux Host AP driver for Intersil Prism2"
* by Jouni Malinen <jkm@ssh.com> or <jkmaline@cc.hut.fi>.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sockio.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/callout.h>
#include <sys/proc.h>
#include <sys/ucred.h>
#include <sys/socket.h>
#include <sys/queue.h>
#include <sys/syslog.h>
#include <sys/sysctl.h>
#include <sys/device.h>
#include <machine/bus.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/if_types.h>
#include <net/if_ether.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <net/if_ieee80211.h>
#include <dev/ic/wireg.h>
#include <dev/ic/wi_ieee.h>
#include <dev/ic/wivar.h>
void wihap_sta_timeout(void *v);
struct wihap_sta_info *wihap_sta_alloc(struct wi_softc *sc, u_int8_t *addr);
void wihap_sta_delete(struct wihap_sta_info *sta);
struct wihap_sta_info *wihap_sta_find(struct wihap_info *whi, u_int8_t *addr);
int wihap_sta_is_assoc(struct wihap_info *whi, u_int8_t addr[]);
void wihap_auth_req(struct wi_softc *sc, struct wi_frame *rxfrm,
caddr_t pkt, int len);
void wihap_sta_deauth(struct wi_softc *sc, u_int8_t sta_addr[],
u_int16_t reason);
void wihap_deauth_req(struct wi_softc *sc, struct wi_frame *rxfrm,
caddr_t pkt, int len);
void wihap_assoc_req(struct wi_softc *sc, struct wi_frame *rxfrm,
caddr_t pkt, int len);
void wihap_sta_disassoc(struct wi_softc *sc, u_int8_t sta_addr[],
u_int16_t reason);
void wihap_disassoc_req(struct wi_softc *sc, struct wi_frame *rxfrm,
caddr_t pkt, int len);
/*
* take_hword()
*
* Used for parsing management frames. The pkt pointer and length
* variables are updated after the value is removed.
*/
static __inline u_int16_t
take_hword(caddr_t *ppkt, int *plen)
{
u_int16_t s = le16toh(* (u_int16_t *) *ppkt);
*ppkt += sizeof(u_int16_t);
*plen -= sizeof(u_int16_t);
return s;
}
/* take_tlv()
*
* Parse out TLV element from a packet, check for underflow of packet
* or overflow of buffer, update pkt/len.
*/
static int
take_tlv(caddr_t *ppkt, int *plen, int id_expect, void *dst, int maxlen)
{
u_int8_t id, len;
if (*plen < 2)
return -1;
id = ((u_int8_t *)*ppkt)[0];
len = ((u_int8_t *)*ppkt)[1];
if (id != id_expect || *plen < len+2 || maxlen < len)
return -1;
bcopy(*ppkt + 2, dst, len);
*plen -= 2 + len;
*ppkt += 2 + len;
return (len);
}
/* put_hword()
* Put half-word element into management frames.
*/
static __inline void
put_hword(caddr_t *ppkt, u_int16_t s)
{
* (u_int16_t *) *ppkt = htole16(s);
*ppkt += sizeof(u_int16_t);
}
/* put_tlv()
* Put TLV elements into management frames.
*/
static void
put_tlv(caddr_t *ppkt, u_int8_t id, void *src, u_int8_t len)
{
(*ppkt)[0] = id;
(*ppkt)[1] = len;
bcopy(src, (*ppkt) + 2, len);
*ppkt += 2 + len;
}
static int
put_rates(caddr_t *ppkt, u_int16_t rates)
{
u_int8_t ratebuf[8];
int len = 0;
if (rates & WI_SUPPRATES_1M)
ratebuf[len++] = 0x82;
if (rates & WI_SUPPRATES_2M)
ratebuf[len++] = 0x84;
if (rates & WI_SUPPRATES_5M)
ratebuf[len++] = 0x8b;
if (rates & WI_SUPPRATES_11M)
ratebuf[len++] = 0x96;
put_tlv(ppkt, IEEE80211_ELEMID_RATES, ratebuf, len);
return len;
}
/* wihap_init()
*
* Initialize host AP data structures. Called even if port type is
* not AP. Caller MUST raise to splnet().
*/
void
wihap_init(struct wi_softc *sc)
{
int i;
struct wihap_info *whi = &sc->wi_hostap_info;
if (sc->sc_ethercom.ec_if.if_flags & IFF_DEBUG)
printf("wihap_init: sc=%p whi=%p\n", sc, whi);
memset(whi, 0, sizeof(struct wihap_info));
if (sc->wi_ptype != WI_PORTTYPE_HOSTAP)
return;
whi->apflags = WIHAPFL_ACTIVE;
LIST_INIT(&whi->sta_list);
for (i = 0; i < WI_STA_HASH_SIZE; i++)
LIST_INIT(&whi->sta_hash[i]);
whi->inactivity_time = WIHAP_DFLT_INACTIVITY_TIME;
}
/* wihap_sta_disassoc()
*
* Send a disassociation frame to a specified station.
*/
void
wihap_sta_disassoc(struct wi_softc *sc, u_int8_t sta_addr[], u_int16_t reason)
{
struct ifnet *ifp = &sc->sc_ethercom.ec_if;
struct wi_80211_hdr *resp_hdr;
caddr_t pkt;
if (ifp->if_flags & IFF_DEBUG)
printf("Sending disassoc to sta %s\n", ether_sprintf(sta_addr));
/* Send disassoc packet. */
resp_hdr = (struct wi_80211_hdr *)sc->wi_txbuf;
memset(resp_hdr, 0, sizeof(struct wi_80211_hdr));
resp_hdr->frame_ctl = WI_FTYPE_MGMT | WI_STYPE_MGMT_DISAS;
pkt = (caddr_t)&sc->wi_txbuf + sizeof(struct wi_80211_hdr);
bcopy(sta_addr, resp_hdr->addr1, ETHER_ADDR_LEN);
bcopy(LLADDR(ifp->if_sadl), resp_hdr->addr2, ETHER_ADDR_LEN);
bcopy(LLADDR(ifp->if_sadl), resp_hdr->addr3, ETHER_ADDR_LEN);
put_hword(&pkt, reason);
wi_mgmt_xmit(sc, (caddr_t)&sc->wi_txbuf,
2 + sizeof(struct wi_80211_hdr));
}
/* wihap_sta_deauth()
*
* Send a deauthentication message to a specified station.
*/
void
wihap_sta_deauth(struct wi_softc *sc, u_int8_t sta_addr[], u_int16_t reason)
{
struct ifnet *ifp = &sc->sc_ethercom.ec_if;
struct wi_80211_hdr *resp_hdr;
caddr_t pkt;
if (ifp->if_flags & IFF_DEBUG)
printf("Sending deauth to sta %s\n", ether_sprintf(sta_addr));
/* Send deauth packet. */
resp_hdr = (struct wi_80211_hdr *)sc->wi_txbuf;
memset(resp_hdr, 0, sizeof(struct wi_80211_hdr));
resp_hdr->frame_ctl = htole16(WI_FTYPE_MGMT | WI_STYPE_MGMT_DEAUTH);
pkt = (caddr_t)&sc->wi_txbuf + sizeof(struct wi_80211_hdr);
bcopy(sta_addr, resp_hdr->addr1, ETHER_ADDR_LEN);
bcopy(LLADDR(ifp->if_sadl), resp_hdr->addr2, ETHER_ADDR_LEN);
bcopy(LLADDR(ifp->if_sadl), resp_hdr->addr3, ETHER_ADDR_LEN);
put_hword(&pkt, reason);
wi_mgmt_xmit(sc, (caddr_t)&sc->wi_txbuf,
2 + sizeof(struct wi_80211_hdr));
}
/* wihap_shutdown()
*
* Disassociate all stations and free up data structures.
* Caller must raise to splnet().
*/
void
wihap_shutdown(struct wi_softc *sc)
{
struct wihap_info *whi = &sc->wi_hostap_info;
struct wihap_sta_info *sta, *next;
int s;
if (sc->sc_ethercom.ec_if.if_flags & IFF_DEBUG)
printf("wihap_shutdown: sc=%p whi=%p\n", sc, whi);
if (!(whi->apflags & WIHAPFL_ACTIVE))
return;
whi->apflags = 0;
/* XXX: I read somewhere you can deauth all the stations with
* a single broadcast. Maybe try that someday.
*/
s = splnet();
sta = LIST_FIRST(&whi->sta_list);
while (sta) {
callout_stop(&sta->tmo);
if (sc->wi_flags & WI_FLAGS_ATTACHED) {
/* Disassociate station. */
if (sta->flags & WI_SIFLAGS_ASSOC)
wihap_sta_disassoc(sc, sta->addr,
IEEE80211_REASON_ASSOC_LEAVE);
/* Deauth station. */
if (sta->flags & WI_SIFLAGS_AUTHEN)
wihap_sta_deauth(sc, sta->addr,
IEEE80211_REASON_AUTH_LEAVE);
}
/* Delete the structure. */
if (sc->sc_ethercom.ec_if.if_flags & IFF_DEBUG)
printf("wihap_shutdown: FREE(sta=%p)\n", sta);
next = LIST_NEXT(sta, list);
FREE(sta, M_DEVBUF);
sta = next;
}
splx(s);
}
/* sta_hash_func()
* Hash function for finding stations from ethernet address.
*/
static __inline int
sta_hash_func(u_int8_t addr[])
{
return ((addr[3] + addr[4] + addr[5]) % WI_STA_HASH_SIZE);
}
/* addr_cmp(): Maybe this is a faster way to compare addresses? */
static __inline int
addr_cmp(u_int8_t a[], u_int8_t b[])
{
return (*(u_int16_t *)(a + 4) == *(u_int16_t *)(b + 4) &&
*(u_int32_t *)(a ) == *(u_int32_t *)(b));
}
void
wihap_sta_timeout(void *v)
{
struct wihap_sta_info *sta = v;
struct wi_softc *sc = sta->sc;
struct wihap_info *whi = &sc->wi_hostap_info;
int s;
s = splsoftnet();
if (sta->flags & WI_SIFLAGS_ASSOC) {
if (sc->sc_ethercom.ec_if.if_flags & IFF_DEBUG)
printf("wihap_timer: disassoc due to inactivity: %s\n",
ether_sprintf(sta->addr));
/* Disassoc station. */
wihap_sta_disassoc(sc, sta->addr,
IEEE80211_REASON_ASSOC_EXPIRE);
sta->flags &= ~WI_SIFLAGS_ASSOC;
callout_reset(&sta->tmo, hz * whi->inactivity_time,
wihap_sta_timeout, sta);
} else if (sta->flags & WI_SIFLAGS_AUTHEN) {
if (sc->sc_ethercom.ec_if.if_flags & IFF_DEBUG)
printf("wihap_timer: deauth due to inactivity: %s\n",
ether_sprintf(sta->addr));
/* Deauthenticate station. */
wihap_sta_deauth(sc, sta->addr, IEEE80211_REASON_AUTH_EXPIRE);
sta->flags &= ~WI_SIFLAGS_AUTHEN;
/* Delete the station if it's not permanent. */
if (!(sta->flags & WI_SIFLAGS_PERM))
wihap_sta_delete(sta);
}
splx(s);
}
/* wihap_sta_delete()
* Delete a single station and free up its data structure.
*/
void
wihap_sta_delete(struct wihap_sta_info *sta)
{
struct wi_softc *sc = sta->sc;
struct wihap_info *whi = &sc->wi_hostap_info;
int i = sta->asid - 0xc001;
callout_stop(&sta->tmo);
whi->asid_inuse_mask[i >> 4] &= ~(1UL << (i & 0xf));
LIST_REMOVE(sta, list);
LIST_REMOVE(sta, hash);
if (sta->challenge)
FREE(sta->challenge, M_TEMP);
FREE(sta, M_DEVBUF);
whi->n_stations--;
}
/* wihap_sta_alloc()
*
* Create a new station data structure and put it in the list
* and hash table.
*/
struct wihap_sta_info *
wihap_sta_alloc(struct wi_softc *sc, u_int8_t *addr)
{
struct wihap_info *whi = &sc->wi_hostap_info;
struct wihap_sta_info *sta;
int i, hash = sta_hash_func(addr);
/* Allocate structure. */
MALLOC(sta, struct wihap_sta_info *, sizeof(struct wihap_sta_info),
M_DEVBUF, M_NOWAIT);
if (sta == NULL)
return (NULL);
memset(sta, 0, sizeof(struct wihap_sta_info));
/* Allocate an ASID. */
i=hash<<4;
while (whi->asid_inuse_mask[i >> 4] & (1UL << (i & 0xf)))
i = (i == (WI_STA_HASH_SIZE << 4) - 1) ? 0 : (i + 1);
whi->asid_inuse_mask[i >> 4] |= (1UL << (i & 0xf));
sta->asid = 0xc001 + i;
/* Insert in list and hash list. */
LIST_INSERT_HEAD(&whi->sta_list, sta, list);
LIST_INSERT_HEAD(&whi->sta_hash[hash], sta, hash);
sta->sc = sc;
whi->n_stations++;
bcopy(addr, &sta->addr, ETHER_ADDR_LEN);
callout_init(&sta->tmo);
callout_reset(&sta->tmo, hz * whi->inactivity_time,
wihap_sta_timeout, sta);
return (sta);
}
/* wihap_sta_find()
*
* Find station structure given address.
*/
struct wihap_sta_info *
wihap_sta_find(struct wihap_info *whi, u_int8_t *addr)
{
int i;
struct wihap_sta_info *sta;
i = sta_hash_func(addr);
LIST_FOREACH(sta, &whi->sta_hash[i], hash)
if (addr_cmp(addr, sta->addr))
return sta;
return (NULL);
}
static __inline int
wihap_check_rates(struct wihap_sta_info *sta, u_int8_t rates[], int rates_len)
{
struct wi_softc *sc = sta->sc;
int i;
sta->rates = 0;
sta->tx_max_rate = 0;
for (i = 0; i < rates_len; i++)
switch (rates[i] & 0x7f) {
case 0x02:
sta->rates |= WI_SUPPRATES_1M;
break;
case 0x04:
sta->rates |= WI_SUPPRATES_2M;
if (sta->tx_max_rate < 1)
sta->tx_max_rate = 1;
break;
case 0x0b:
sta->rates |= WI_SUPPRATES_5M;
if (sta->tx_max_rate < 2)
sta->tx_max_rate = 2;
break;
case 0x16:
sta->rates |= WI_SUPPRATES_11M;
sta->tx_max_rate = 3;
break;
}
sta->rates &= sc->wi_supprates;
sta->tx_curr_rate = sta->tx_max_rate;
return (sta->rates == 0 ? -1 : 0);
}
/* wihap_auth_req()
*
* Handle incoming authentication request. Only handle OPEN
* requests.
*/
void
wihap_auth_req(struct wi_softc *sc, struct wi_frame *rxfrm,
caddr_t pkt, int len)
{
struct ifnet *ifp = &sc->sc_ethercom.ec_if;
struct wihap_info *whi = &sc->wi_hostap_info;
struct wihap_sta_info *sta;
int i;
u_int16_t algo;
u_int16_t seq;
u_int16_t status;
int challenge_len;
u_int32_t challenge[32];
struct wi_80211_hdr *resp_hdr;
if (len < 6)
return;
/* Break open packet. */
algo = take_hword(&pkt, &len);
seq = take_hword(&pkt, &len);
status = take_hword(&pkt, &len);
challenge_len = 0;
if (len > 0 && (challenge_len = take_tlv(&pkt, &len,
IEEE80211_ELEMID_CHALLENGE, challenge, sizeof(challenge))) < 0)
return;
if (sc->sc_ethercom.ec_if.if_flags & IFF_DEBUG)
printf("wihap_auth_req: station %s algo=0x%x seq=0x%x\n",
ether_sprintf(rxfrm->wi_addr2), algo, seq);
/* Find or create station info. */
sta = wihap_sta_find(whi, rxfrm->wi_addr2);
if (sta == NULL) {
/* Are we allowing new stations?
*/
if (whi->apflags & WIHAPFL_MAC_FILT) {
status = IEEE80211_STATUS_OTHER; /* XXX */
goto fail;
}
/* Check for too many stations.
*/
if (whi->n_stations >= WIHAP_MAX_STATIONS) {
status = IEEE80211_STATUS_TOOMANY;
goto fail;
}
if (sc->sc_ethercom.ec_if.if_flags & IFF_DEBUG)
printf("wihap_auth_req: new station\n");
/* Create new station. */
sta = wihap_sta_alloc(sc, rxfrm->wi_addr2);
if (sta == NULL) {
/* Out of memory! */
status = IEEE80211_STATUS_TOOMANY;
goto fail;
}
}
callout_reset(&sta->tmo, hz * whi->inactivity_time,
wihap_sta_timeout, sta);
/* Note: it's okay to leave the station info structure around
* if the authen fails. It'll be timed out eventually.
*/
switch (algo) {
case IEEE80211_AUTH_ALG_OPEN:
if (sc->wi_authtype != IEEE80211_AUTH_OPEN) {
seq = 2;
status = IEEE80211_STATUS_ALG;
goto fail;
}
if (seq != 1) {
seq = 2;
status = IEEE80211_STATUS_SEQUENCE;
goto fail;
}
challenge_len = 0;
seq = 2;
sta->flags |= WI_SIFLAGS_AUTHEN;
break;
case IEEE80211_AUTH_ALG_SHARED:
if (sc->wi_authtype != IEEE80211_AUTH_SHARED) {
seq = 2;
status = IEEE80211_STATUS_ALG;
goto fail;
}
switch (seq) {
case 1:
/* Create a challenge frame. */
if (!sta->challenge) {
MALLOC(sta->challenge, u_int32_t *, 128,
M_TEMP, M_NOWAIT);
if (!sta->challenge)
return;
}
for (i = 0; i < 32; i++)
challenge[i] = sta->challenge[i] =
arc4random();
if (sc->sc_ethercom.ec_if.if_flags & IFF_DEBUG)
printf("\tchallenge: 0x%x 0x%x ...\n",
challenge[0], challenge[1]);
challenge_len = 128;
seq = 2;
break;
case 3:
if (challenge_len != 128 || !sta->challenge ||
!(le16toh(rxfrm->wi_frame_ctl) & WI_FCTL_WEP)) {
status = IEEE80211_STATUS_CHALLENGE;
goto fail;
}
for (i=0; i<32; i++)
if (sta->challenge[i] != challenge[i]) {
status = IEEE80211_STATUS_CHALLENGE;
goto fail;
}
sta->flags |= WI_SIFLAGS_AUTHEN;
FREE(sta->challenge, M_TEMP);
sta->challenge = NULL;
challenge_len = 0;
seq = 4;
break;
default:
seq = 2;
status = IEEE80211_STATUS_SEQUENCE;
goto fail;
} /* switch (seq) */
break;
default:
if (sc->sc_ethercom.ec_if.if_flags & IFF_DEBUG)
printf("wihap_auth_req: algorithm unsupported: 0x%x\n",
algo);
status = IEEE80211_STATUS_ALG;
goto fail;
} /* switch (algo) */
status = IEEE80211_STATUS_SUCCESS;
fail:
if (sc->sc_ethercom.ec_if.if_flags & IFF_DEBUG)
printf("wihap_auth_req: returns status=0x%x\n", status);
/* Send response. */
resp_hdr = (struct wi_80211_hdr *)&sc->wi_txbuf;
memset(resp_hdr, 0, sizeof(struct wi_80211_hdr));
resp_hdr->frame_ctl = htole16(WI_FTYPE_MGMT | WI_STYPE_MGMT_AUTH);
bcopy(rxfrm->wi_addr2, resp_hdr->addr1, ETHER_ADDR_LEN);
bcopy(LLADDR(ifp->if_sadl), resp_hdr->addr2, ETHER_ADDR_LEN);
bcopy(LLADDR(ifp->if_sadl), resp_hdr->addr3, ETHER_ADDR_LEN);
pkt = (caddr_t)&sc->wi_txbuf + sizeof(struct wi_80211_hdr);
put_hword(&pkt, algo);
put_hword(&pkt, seq);
put_hword(&pkt, status);
if (challenge_len > 0)
put_tlv(&pkt, IEEE80211_ELEMID_CHALLENGE,
challenge, challenge_len);
wi_mgmt_xmit(sc, (caddr_t)&sc->wi_txbuf,
6 + sizeof(struct wi_80211_hdr) +
(challenge_len > 0 ? challenge_len + 2 : 0));
}
/* wihap_assoc_req()
*
* Handle incoming association and reassociation requests.
*/
void
wihap_assoc_req(struct wi_softc *sc, struct wi_frame *rxfrm,
caddr_t pkt, int len)
{
struct ifnet *ifp = &sc->sc_ethercom.ec_if;
struct wihap_info *whi = &sc->wi_hostap_info;
struct wihap_sta_info *sta;
struct wi_80211_hdr *resp_hdr;
u_int16_t capinfo;
u_int16_t lstintvl;
u_int8_t rates[8];
int ssid_len, rates_len;
struct ieee80211_nwid ssid;
u_int16_t status;
u_int16_t asid = 0;
if (len < 8)
return;
/* Pull out request parameters. */
capinfo = take_hword(&pkt, &len);
lstintvl = take_hword(&pkt, &len);
if ((rxfrm->wi_frame_ctl & htole16(WI_FCTL_STYPE)) ==
htole16(WI_STYPE_MGMT_REASREQ)) {
if (len < 6)
return;
/* Eat the MAC address of the current AP */
take_hword(&pkt, &len);
take_hword(&pkt, &len);
take_hword(&pkt, &len);
}
if ((ssid_len = take_tlv(&pkt, &len, IEEE80211_ELEMID_SSID,
ssid.i_nwid, sizeof(ssid)))<0)
return;
ssid.i_len = ssid_len;
if ((rates_len = take_tlv(&pkt, &len, IEEE80211_ELEMID_RATES,
rates, sizeof(rates)))<0)
return;
if (sc->sc_ethercom.ec_if.if_flags & IFF_DEBUG)
printf("wihap_assoc_req: from station %s\n",
ether_sprintf(rxfrm->wi_addr2));
/* If SSID doesn't match, simply drop. */
if (sc->wi_netid.i_len != ssid.i_len ||
memcmp(sc->wi_netid.i_nwid, ssid.i_nwid, ssid.i_len)) {
if (sc->sc_ethercom.ec_if.if_flags & IFF_DEBUG)
printf("wihap_assoc_req: bad ssid: '%.*s' != '%.*s'\n",
ssid.i_len, ssid.i_nwid, sc->wi_netid.i_len,
sc->wi_netid.i_nwid);
return;
}
/* Is this station authenticated yet? */
sta = wihap_sta_find(whi, rxfrm->wi_addr2);
if (sta == NULL || !(sta->flags & WI_SIFLAGS_AUTHEN)) {
wihap_sta_deauth(sc, rxfrm->wi_addr2,
IEEE80211_REASON_NOT_AUTHED);
return;
}
/* Check supported rates against ours. */
if (wihap_check_rates(sta, rates, rates_len)<0) {
if (sc->sc_ethercom.ec_if.if_flags & IFF_DEBUG)
printf("wihap_assoc_req: rates mismatch.\n");
status = IEEE80211_STATUS_BASIC_RATE;
goto fail;
}
/* Check capinfo.
* Check for ESS, not IBSS.
* Check WEP/PRIVACY flags match.
* Refuse stations requesting to be put on CF-polling list.
*/
sta->capinfo = capinfo;
status = IEEE80211_STATUS_CAPINFO;
if ((capinfo & (IEEE80211_CAPINFO_ESS | IEEE80211_CAPINFO_IBSS)) !=
IEEE80211_CAPINFO_ESS) {
if (sc->sc_ethercom.ec_if.if_flags & IFF_DEBUG)
printf("wihap_assoc_req: capinfo: not ESS: "
"capinfo=0x%x\n", capinfo);
goto fail;
}
if ((sc->wi_use_wep && !(capinfo & IEEE80211_CAPINFO_PRIVACY)) ||
(!sc->wi_use_wep && (capinfo & IEEE80211_CAPINFO_PRIVACY))) {
if (sc->sc_ethercom.ec_if.if_flags & IFF_DEBUG)
printf("wihap_assoc_req: WEP flag mismatch: "
"capinfo=0x%x\n", capinfo);
goto fail;
}
if ((capinfo & (IEEE80211_CAPINFO_CF_POLLABLE |
IEEE80211_CAPINFO_CF_POLLREQ)) == IEEE80211_CAPINFO_CF_POLLABLE) {
if (sc->sc_ethercom.ec_if.if_flags & IFF_DEBUG)
printf("wihap_assoc_req: polling not supported: "
"capinfo=0x%x\n", capinfo);
goto fail;
}
/* Use ASID is allocated by whi_sta_alloc(). */
asid = sta->asid;
if (sta->flags & WI_SIFLAGS_ASSOC) {
if (sc->sc_ethercom.ec_if.if_flags & IFF_DEBUG)
printf("wihap_assoc_req: already assoc'ed?\n");
}
sta->flags |= WI_SIFLAGS_ASSOC;
callout_reset(&sta->tmo, hz * whi->inactivity_time,
wihap_sta_timeout, sta);
status = IEEE80211_STATUS_SUCCESS;
fail:
if (sc->sc_ethercom.ec_if.if_flags & IFF_DEBUG)
printf("wihap_assoc_req: returns status=0x%x\n", status);
/* Send response. */
resp_hdr = (struct wi_80211_hdr *)&sc->wi_txbuf;
memset(resp_hdr, 0, sizeof(struct wi_80211_hdr));
resp_hdr->frame_ctl = htole16(WI_FTYPE_MGMT | WI_STYPE_MGMT_ASRESP);
pkt = (caddr_t)&sc->wi_txbuf + sizeof(struct wi_80211_hdr);
bcopy(rxfrm->wi_addr2, resp_hdr->addr1, ETHER_ADDR_LEN);
bcopy(LLADDR(ifp->if_sadl), resp_hdr->addr2, ETHER_ADDR_LEN);
bcopy(LLADDR(ifp->if_sadl), resp_hdr->addr3, ETHER_ADDR_LEN);
put_hword(&pkt, capinfo);
put_hword(&pkt, status);
put_hword(&pkt, asid);
rates_len = put_rates(&pkt, sc->wi_supprates);
wi_mgmt_xmit(sc, (caddr_t)&sc->wi_txbuf,
8 + rates_len + sizeof(struct wi_80211_hdr));
}
/* wihap_deauth_req()
*
* Handle deauthentication requests. Delete the station.
*/
void
wihap_deauth_req(struct wi_softc *sc, struct wi_frame *rxfrm,
caddr_t pkt, int len)
{
struct wihap_info *whi = &sc->wi_hostap_info;
struct wihap_sta_info *sta;
u_int16_t reason;
if (len<2)
return;
reason = take_hword(&pkt, &len);
sta = wihap_sta_find(whi, rxfrm->wi_addr2);
if (sta == NULL) {
if (sc->sc_ethercom.ec_if.if_flags & IFF_DEBUG)
printf("wihap_deauth_req: unknown station: %s\n",
ether_sprintf(rxfrm->wi_addr2));
}
else
wihap_sta_delete(sta);
}
/* wihap_disassoc_req()
*
* Handle disassociation requests. Just reset the assoc flag.
* We'll free up the station resources when we get a deauth
* request or when it times out.
*/
void
wihap_disassoc_req(struct wi_softc *sc, struct wi_frame *rxfrm,
caddr_t pkt, int len)
{
struct wihap_info *whi = &sc->wi_hostap_info;
struct wihap_sta_info *sta;
u_int16_t reason;
if (len < 2)
return;
reason = take_hword(&pkt, &len);
sta = wihap_sta_find(whi, rxfrm->wi_addr2);
if (sta == NULL) {
if (sc->sc_ethercom.ec_if.if_flags & IFF_DEBUG)
printf("wihap_disassoc_req: unknown station: %s\n",
ether_sprintf(rxfrm->wi_addr2));
}
else if (!(sta->flags & WI_SIFLAGS_AUTHEN)) {
/*
* If station is not authenticated, send deauthentication
* frame.
*/
wihap_sta_deauth(sc, rxfrm->wi_addr2,
IEEE80211_REASON_NOT_AUTHED);
return;
}
else
sta->flags &= ~WI_SIFLAGS_ASSOC;
}
/* wihap_debug_frame_type()
*
* Print out frame type. Used in early debugging.
*/
static __inline void
wihap_debug_frame_type(struct wi_frame *rxfrm)
{
printf("wihap_mgmt_input: len=%d ", le16toh(rxfrm->wi_dat_len));
if ((rxfrm->wi_frame_ctl & htole16(WI_FCTL_FTYPE)) ==
htole16(WI_FTYPE_MGMT)) {
printf("MGMT: ");
switch (le16toh(rxfrm->wi_frame_ctl) & WI_FCTL_STYPE) {
case WI_STYPE_MGMT_ASREQ:
printf("assoc req: \n");
break;
case WI_STYPE_MGMT_ASRESP:
printf("assoc resp: \n");
break;
case WI_STYPE_MGMT_REASREQ:
printf("reassoc req: \n");
break;
case WI_STYPE_MGMT_REASRESP:
printf("reassoc resp: \n");
break;
case WI_STYPE_MGMT_PROBEREQ:
printf("probe req: \n");
break;
case WI_STYPE_MGMT_PROBERESP:
printf("probe resp: \n");
break;
case WI_STYPE_MGMT_BEACON:
printf("beacon: \n");
break;
case WI_STYPE_MGMT_ATIM:
printf("ann traf ind \n");
break;
case WI_STYPE_MGMT_DISAS:
printf("disassociation: \n");
break;
case WI_STYPE_MGMT_AUTH:
printf("auth: \n");
break;
case WI_STYPE_MGMT_DEAUTH:
printf("deauth: \n");
break;
default:
printf("unknown (stype=0x%x)\n",
le16toh(rxfrm->wi_frame_ctl) & WI_FCTL_STYPE);
}
}
else {
printf("ftype=0x%x (ctl=0x%x)\n",
le16toh(rxfrm->wi_frame_ctl) & WI_FCTL_FTYPE,
le16toh(rxfrm->wi_frame_ctl));
}
}
/*
* wihap_mgmt_input:
*
* Called for each management frame received in host ap mode.
* wihap_mgmt_input() is expected to free the mbuf.
*/
void
wihap_mgmt_input(struct wi_softc *sc, struct wi_frame *rxfrm, struct mbuf *m)
{
caddr_t pkt;
int s, len;
if (sc->sc_ethercom.ec_if.if_flags & IFF_DEBUG)
wihap_debug_frame_type(rxfrm);
pkt = mtod(m, caddr_t) + WI_802_11_OFFSET_RAW;
len = m->m_len - WI_802_11_OFFSET_RAW;
if ((rxfrm->wi_frame_ctl & htole16(WI_FCTL_FTYPE)) ==
htole16(WI_FTYPE_MGMT)) {
/* any of the following will mess w/ the station list */
s = splsoftclock();
switch (le16toh(rxfrm->wi_frame_ctl) & WI_FCTL_STYPE) {
case WI_STYPE_MGMT_ASREQ:
wihap_assoc_req(sc, rxfrm, pkt, len);
break;
case WI_STYPE_MGMT_ASRESP:
break;
case WI_STYPE_MGMT_REASREQ:
wihap_assoc_req(sc, rxfrm, pkt, len);
break;
case WI_STYPE_MGMT_REASRESP:
break;
case WI_STYPE_MGMT_PROBEREQ:
break;
case WI_STYPE_MGMT_PROBERESP:
break;
case WI_STYPE_MGMT_BEACON:
break;
case WI_STYPE_MGMT_ATIM:
break;
case WI_STYPE_MGMT_DISAS:
wihap_disassoc_req(sc, rxfrm, pkt, len);
break;
case WI_STYPE_MGMT_AUTH:
wihap_auth_req(sc, rxfrm, pkt, len);
break;
case WI_STYPE_MGMT_DEAUTH:
wihap_deauth_req(sc, rxfrm, pkt, len);
break;
}
splx(s);
}
m_freem(m);
}
/* wihap_sta_is_assoc()
*
* Determine if a station is assoc'ed. Update its activity
* counter as a side-effect.
*/
int
wihap_sta_is_assoc(struct wihap_info *whi, u_int8_t addr[])
{
struct wihap_sta_info *sta;
sta = wihap_sta_find(whi, addr);
if (sta != NULL && (sta->flags & WI_SIFLAGS_ASSOC)) {
/* Keep it active. */
callout_reset(&sta->tmo, hz * whi->inactivity_time,
wihap_sta_timeout, sta);
return (1);
}
return (0);
}
/* wihap_check_tx()
*
* Determine if a station is assoc'ed, get its tx rate, and update
* its activity.
*/
int
wihap_check_tx(struct wihap_info *whi, u_int8_t addr[], u_int8_t *txrate)
{
struct wihap_sta_info *sta;
static u_int8_t txratetable[] = { 10, 20, 55, 110 };
int s;
if (addr[0] & 0x01) {
*txrate = 0; /* XXX: multicast rate? */
return (1);
}
s = splsoftclock();
sta = wihap_sta_find(whi, addr);
if (sta != NULL && (sta->flags & WI_SIFLAGS_ASSOC)) {
/* Keep it active. */
callout_reset(&sta->tmo, hz * whi->inactivity_time,
wihap_sta_timeout, sta);
*txrate = txratetable[sta->tx_curr_rate];
splx(s);
return (1);
}
splx(s);
return (0);
}
/*
* wihap_data_input()
*
* Handle all data input on interface when in Host AP mode.
* Some packets are destined for this machine, others are
* repeated to other stations.
*
* If wihap_data_input() returns a non-zero, it has processed
* the packet and will free the mbuf.
*/
int
wihap_data_input(struct wi_softc *sc, struct wi_frame *rxfrm, struct mbuf *m)
{
struct ifnet *ifp = &sc->sc_ethercom.ec_if;
struct wihap_info *whi = &sc->wi_hostap_info;
struct wihap_sta_info *sta;
int mcast, s;
/* TODS flag must be set. */
if (!(rxfrm->wi_frame_ctl & htole16(WI_FCTL_TODS))) {
if (ifp->if_flags & IFF_DEBUG)
printf("wihap_data_input: no TODS src=%s\n",
ether_sprintf(rxfrm->wi_addr2));
m_freem(m);
return (1);
}
/* Check BSSID. (Is this necessary?) */
if (!addr_cmp(rxfrm->wi_addr1, LLADDR(ifp->if_sadl))) {
if (ifp->if_flags & IFF_DEBUG)
printf("wihap_data_input: incorrect bss: %s\n",
ether_sprintf(rxfrm->wi_addr1));
m_freem(m);
return (1);
}
s = splsoftclock();
/* Find source station. */
sta = wihap_sta_find(whi, rxfrm->wi_addr2);
/* Source station must be associated. */
if (sta == NULL || !(sta->flags & WI_SIFLAGS_ASSOC)) {
if (ifp->if_flags & IFF_DEBUG)
printf("wihap_data_input: dropping unassoc src %s\n",
ether_sprintf(rxfrm->wi_addr2));
wihap_sta_disassoc(sc, rxfrm->wi_addr2,
IEEE80211_REASON_ASSOC_LEAVE);
splx(s);
m_freem(m);
return (1);
}
callout_reset(&sta->tmo, hz * whi->inactivity_time,
wihap_sta_timeout, sta);
sta->sig_info = le16toh(rxfrm->wi_q_info);
splx(s);
/* Repeat this packet to BSS? */
mcast = (rxfrm->wi_addr3[0] & 0x01) != 0;
if (mcast || wihap_sta_is_assoc(whi, rxfrm->wi_addr3)) {
/* If it's multicast, make a copy.
*/
if (mcast) {
m = m_copym(m, 0, M_COPYALL, M_DONTWAIT);
if (m == NULL)
return (0);
m->m_flags |= M_MCAST; /* XXX */
}
/* Queue up for repeating.
*/
if (IF_QFULL(&ifp->if_snd)) {
IF_DROP(&ifp->if_snd);
m_freem(m);
}
else {
ifp->if_obytes += m->m_pkthdr.len;
if (m->m_flags & M_MCAST)
ifp->if_omcasts++;
IF_ENQUEUE(&ifp->if_snd, m);
if ((ifp->if_flags & IFF_OACTIVE) == 0)
(*ifp->if_start)(ifp);
}
return (!mcast);
}
return (0);
}
/* wihap_ioctl()
*
* Handle Host AP specific ioctls. Called from wi_ioctl().
*/
int
wihap_ioctl(struct wi_softc *sc, u_long command, caddr_t data)
{
struct proc *p = curproc;
struct ifreq *ifr = (struct ifreq *) data;
struct wihap_info *whi = &sc->wi_hostap_info;
struct wihap_sta_info *sta;
struct hostap_getall reqall;
struct hostap_sta reqsta;
struct hostap_sta stabuf;
int s, error = 0, n, flag;
if (!(sc->sc_ethercom.ec_if.if_flags & IFF_RUNNING))
return ENODEV;
switch (command) {
case SIOCHOSTAP_DEL:
if ((error = suser(p->p_ucred, &p->p_acflag)))
break;
if ((error = copyin(ifr->ifr_data, &reqsta, sizeof(reqsta))))
break;
s = splnet();
sta = wihap_sta_find(whi, reqsta.addr);
if (sta == NULL)
error = ENOENT;
else {
/* Disassociate station. */
if (sta->flags & WI_SIFLAGS_ASSOC)
wihap_sta_disassoc(sc, sta->addr,
IEEE80211_REASON_ASSOC_LEAVE);
/* Deauth station. */
if (sta->flags & WI_SIFLAGS_AUTHEN)
wihap_sta_deauth(sc, sta->addr,
IEEE80211_REASON_AUTH_LEAVE);
wihap_sta_delete(sta);
}
splx(s);
break;
case SIOCHOSTAP_GET:
if ((error = copyin(ifr->ifr_data, &reqsta, sizeof(reqsta))))
break;
s = splnet();
sta = wihap_sta_find(whi, reqsta.addr);
if (sta == NULL)
error = ENOENT;
else {
reqsta.flags = sta->flags;
reqsta.asid = sta->asid;
reqsta.capinfo = sta->capinfo;
reqsta.sig_info = sta->sig_info;
reqsta.rates = sta->rates;
error = copyout(&reqsta, ifr->ifr_data,
sizeof(reqsta));
}
splx(s);
break;
case SIOCHOSTAP_ADD:
if ((error = suser(p->p_ucred, &p->p_acflag)))
break;
if ((error = copyin(ifr->ifr_data, &reqsta, sizeof(reqsta))))
break;
s = splnet();
sta = wihap_sta_find(whi, reqsta.addr);
if (sta != NULL) {
error = EEXIST;
splx(s);
break;
}
if (whi->n_stations >= WIHAP_MAX_STATIONS) {
error = ENOSPC;
splx(s);
break;
}
sta = wihap_sta_alloc(sc, reqsta.addr);
sta->flags = reqsta.flags;
callout_reset(&sta->tmo, hz * whi->inactivity_time,
wihap_sta_timeout, sta);
splx(s);
break;
case SIOCHOSTAP_SFLAGS:
if ((error = suser(p->p_ucred, &p->p_acflag)))
break;
if ((error = copyin(ifr->ifr_data, &flag, sizeof(int))))
break;
whi->apflags = (whi->apflags & WIHAPFL_CANTCHANGE) |
(flag & ~WIHAPFL_CANTCHANGE);
break;
case SIOCHOSTAP_GFLAGS:
flag = (int) whi->apflags;
error = copyout(&flag, ifr->ifr_data, sizeof(int));
break;
case SIOCHOSTAP_GETALL:
if ((error = copyin(ifr->ifr_data, &reqall, sizeof(reqall))))
break;
reqall.nstations = whi->n_stations;
n = 0;
s = splnet();
sta = LIST_FIRST(&whi->sta_list);
while (sta && reqall.size >= n+sizeof(struct hostap_sta)) {
bcopy(sta->addr, stabuf.addr, ETHER_ADDR_LEN);
stabuf.asid = sta->asid;
stabuf.flags = sta->flags;
stabuf.capinfo = sta->capinfo;
stabuf.sig_info = sta->sig_info;
stabuf.rates = sta->rates;
error = copyout(&stabuf, (caddr_t) reqall.addr + n,
sizeof(struct hostap_sta));
if (error)
break;
sta = LIST_NEXT(sta, list);
n += sizeof(struct hostap_sta);
}
splx(s);
if (!error)
error = copyout(&reqall, ifr->ifr_data,
sizeof(reqall));
break;
default:
printf("wihap_ioctl: i shouldn't get other ioctls!\n");
error = EINVAL;
}
return (error);
}
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