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|
/* $OpenBSD: ieee80211_output.c,v 1.28 2007/06/16 11:59:58 damien Exp $ */
/* $NetBSD: ieee80211_output.c,v 1.13 2004/05/31 11:02:55 dyoung Exp $ */
/*-
* 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.
*
* 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 "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>
#include <net/bpf.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/if_ether.h>
#endif
#include <net80211/ieee80211_var.h>
int ieee80211_mgmt_output(struct ifnet *, struct ieee80211_node *,
struct mbuf *, int);
struct mbuf *ieee80211_getmbuf(int, int, u_int);
/*
* IEEE 802.11 output routine. Normally this will directly call the
* Ethernet output routine because 802.11 encapsulation is called
* later by the driver. This function can be used to send raw frames
* if the mbuf has been tagged with a 802.11 data link type.
*/
int
ieee80211_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
struct rtentry *rt)
{
u_int dlt = 0;
int s, error = 0;
struct m_tag *mtag;
/* Interface has to be up and running */
if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) !=
(IFF_UP | IFF_RUNNING)) {
error = ENETDOWN;
goto bad;
}
/* Try to get the DLT from a mbuf tag */
if ((mtag = m_tag_find(m, PACKET_TAG_DLT, NULL)) != NULL) {
dlt = *(u_int *)(mtag + 1);
/* Fallback to ethernet for non-802.11 linktypes */
if (!(dlt == DLT_IEEE802_11 || dlt == DLT_IEEE802_11_RADIO))
goto fallback;
/*
* Queue message on interface without adding any
* further headers, and start output if interface not
* yet active.
*/
s = splnet();
IFQ_ENQUEUE(&ifp->if_snd, m, NULL, error);
if (error) {
/* mbuf is already freed */
splx(s);
printf("%s: failed to queue raw tx frame\n",
ifp->if_xname);
return (error);
}
ifp->if_obytes += m->m_pkthdr.len;
if (m->m_flags & M_MCAST)
ifp->if_omcasts++;
if ((ifp->if_flags & IFF_OACTIVE) == 0)
(*ifp->if_start)(ifp);
splx(s);
return (error);
}
fallback:
return (ether_output(ifp, m, dst, rt));
bad:
if (m)
m_freem(m);
return (error);
}
/*
* Send a management frame to the specified node. The node pointer
* must have a reference as the pointer will be passed to the driver
* and potentially held for a long time. If the frame is successfully
* dispatched to the driver, then it is responsible for freeing the
* reference (and potentially free'ing up any associated storage).
*/
int
ieee80211_mgmt_output(struct ifnet *ifp, struct ieee80211_node *ni,
struct mbuf *m, int type)
{
struct ieee80211com *ic = (void *)ifp;
struct ieee80211_frame *wh;
if (ni == NULL)
panic("null node");
ni->ni_inact = 0;
/*
* Yech, hack alert! We want to pass the node down to the
* driver's start routine. We could stick this in an m_tag
* and tack that on to the mbuf. However that's rather
* expensive to do for every frame so instead we stuff it in
* the rcvif field since outbound frames do not (presently)
* use this.
*/
M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT);
if (m == NULL)
return ENOMEM;
m->m_pkthdr.rcvif = (void *)ni;
wh = mtod(m, struct ieee80211_frame *);
wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | type;
wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
*(u_int16_t *)&wh->i_dur[0] = 0;
*(u_int16_t *)&wh->i_seq[0] =
htole16(ni->ni_txseq << IEEE80211_SEQ_SEQ_SHIFT);
ni->ni_txseq++;
IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr);
IEEE80211_ADDR_COPY(wh->i_addr2, ic->ic_myaddr);
IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid);
if ((m->m_flags & M_LINK0) != 0 && ni->ni_challenge != NULL) {
m->m_flags &= ~M_LINK0;
IEEE80211_DPRINTF(("%s: encrypting frame for %s\n", __func__,
ether_sprintf(wh->i_addr1)));
wh->i_fc[1] |= IEEE80211_FC1_WEP;
}
if (ifp->if_flags & IFF_DEBUG) {
/* avoid to print too many frames */
if (ic->ic_opmode == IEEE80211_M_IBSS ||
#ifdef IEEE80211_DEBUG
ieee80211_debug > 1 ||
#endif
(type & IEEE80211_FC0_SUBTYPE_MASK) !=
IEEE80211_FC0_SUBTYPE_PROBE_RESP)
printf("%s: sending %s to %s on channel %u mode %s\n",
ifp->if_xname,
ieee80211_mgt_subtype_name[
(type & IEEE80211_FC0_SUBTYPE_MASK)
>> IEEE80211_FC0_SUBTYPE_SHIFT],
ether_sprintf(ni->ni_macaddr),
ieee80211_chan2ieee(ic, ni->ni_chan),
ieee80211_phymode_name[
ieee80211_chan2mode(ic, ni->ni_chan)]);
}
IF_ENQUEUE(&ic->ic_mgtq, m);
ifp->if_timer = 1;
(*ifp->if_start)(ifp);
return 0;
}
/*-
* EDCA tables are computed using the following formulas:
*
* 1) EDCATable (non-AP QSTA)
*
* AC CWmin CWmax AIFSN TXOP limit(ms)
* -------------------------------------------------------------
* AC_BK aCWmin aCWmax 7 0
* AC_BE aCWmin aCWmax 3 0
* AC_VI (aCWmin+1)/2-1 aCWmin 2 agn=3.008 b=6.016 others=0
* AC_VO (aCWmin+1)/4-1 (aCWmin+1)/2-1 2 agn=1.504 b=3.264 others=0
*
* 2) QAPEDCATable (QAP)
*
* AC CWmin CWmax AIFSN TXOP limit(ms)
* -------------------------------------------------------------
* AC_BK aCWmin aCWmax 7 0
* AC_BE aCWmin 4*(aCWmin+1)-1 3 0
* AC_VI (aCWmin+1)/2-1 aCWmin 1 agn=3.008 b=6.016 others=0
* AC_VO (aCWmin+1)/4-1 (aCWmin+1)/2-1 1 agn=1.504 b=3.264 others=0
*
* and the following aCWmin/aCWmax values:
*
* PHY aCWmin aCWmax
* ---------------------------
* 11A 15 1023
* 11B 31 1023
* 11G 15* 1023 (*) aCWmin(1)
* FH 15 1023
* Turbo A/G 7 1023 (Atheros proprietary mode)
*/
static const struct ieee80211_edca_ac_params
ieee80211_edca_table[IEEE80211_MODE_MAX][EDCA_NUM_AC] = {
[IEEE80211_MODE_FH] = {
[EDCA_AC_BK] = { 4, 10, 7, 0 },
[EDCA_AC_BE] = { 4, 10, 3, 0 },
[EDCA_AC_VI] = { 3, 4, 2, 0 },
[EDCA_AC_VO] = { 2, 3, 2, 0 }
},
[IEEE80211_MODE_11B] = {
[EDCA_AC_BK] = { 5, 10, 7, 0 },
[EDCA_AC_BE] = { 5, 10, 3, 0 },
[EDCA_AC_VI] = { 4, 5, 2, 188 },
[EDCA_AC_VO] = { 3, 4, 2, 102 }
},
[IEEE80211_MODE_11A] = {
[EDCA_AC_BK] = { 4, 10, 7, 0 },
[EDCA_AC_BE] = { 4, 10, 3, 0 },
[EDCA_AC_VI] = { 3, 4, 2, 94 },
[EDCA_AC_VO] = { 2, 3, 2, 47 }
},
[IEEE80211_MODE_11G] = {
[EDCA_AC_BK] = { 4, 10, 7, 0 },
[EDCA_AC_BE] = { 4, 10, 3, 0 },
[EDCA_AC_VI] = { 3, 4, 2, 94 },
[EDCA_AC_VO] = { 2, 3, 2, 47 }
},
[IEEE80211_MODE_TURBO] = {
[EDCA_AC_BK] = { 3, 10, 7, 0 },
[EDCA_AC_BE] = { 3, 10, 2, 0 },
[EDCA_AC_VI] = { 2, 3, 2, 94 },
[EDCA_AC_VO] = { 2, 2, 1, 47 }
}
};
static const struct ieee80211_edca_ac_params
ieee80211_qap_edca_table[IEEE80211_MODE_MAX][EDCA_NUM_AC] = {
[IEEE80211_MODE_FH] = {
[EDCA_AC_BK] = { 4, 10, 7, 0 },
[EDCA_AC_BE] = { 4, 6, 3, 0 },
[EDCA_AC_VI] = { 3, 4, 1, 0 },
[EDCA_AC_VO] = { 2, 3, 1, 0 }
},
[IEEE80211_MODE_11B] = {
[EDCA_AC_BK] = { 5, 10, 7, 0 },
[EDCA_AC_BE] = { 5, 7, 3, 0 },
[EDCA_AC_VI] = { 4, 5, 1, 188 },
[EDCA_AC_VO] = { 3, 4, 1, 102 }
},
[IEEE80211_MODE_11A] = {
[EDCA_AC_BK] = { 4, 10, 7, 0 },
[EDCA_AC_BE] = { 4, 6, 3, 0 },
[EDCA_AC_VI] = { 3, 4, 1, 94 },
[EDCA_AC_VO] = { 2, 3, 1, 47 }
},
[IEEE80211_MODE_11G] = {
[EDCA_AC_BK] = { 4, 10, 7, 0 },
[EDCA_AC_BE] = { 4, 6, 3, 0 },
[EDCA_AC_VI] = { 3, 4, 1, 94 },
[EDCA_AC_VO] = { 2, 3, 1, 47 }
},
[IEEE80211_MODE_TURBO] = {
[EDCA_AC_BK] = { 3, 10, 7, 0 },
[EDCA_AC_BE] = { 3, 5, 2, 0 },
[EDCA_AC_VI] = { 2, 3, 1, 94 },
[EDCA_AC_VO] = { 2, 2, 1, 47 }
}
};
/*
* Encapsulate an outbound data frame. The mbuf chain is updated and
* a reference to the destination node is returned. If an error is
* encountered NULL is returned and the node reference will also be NULL.
*
* NB: The caller is responsible for free'ing a returned node reference.
* The convention is ic_bss is not reference counted; the caller must
* maintain that.
*/
struct mbuf *
ieee80211_encap(struct ifnet *ifp, struct mbuf *m, struct ieee80211_node **pni)
{
struct ieee80211com *ic = (void *)ifp;
struct ether_header eh;
struct ieee80211_frame *wh;
struct ieee80211_node *ni = NULL;
struct llc *llc;
struct m_tag *mtag;
u_int8_t *addr;
u_int dlt;
/* Handle raw frames if mbuf is tagged as 802.11 */
if ((mtag = m_tag_find(m, PACKET_TAG_DLT, NULL)) != NULL) {
dlt = *(u_int *)(mtag + 1);
if (!(dlt == DLT_IEEE802_11 || dlt == DLT_IEEE802_11_RADIO))
goto fallback;
wh = mtod(m, struct ieee80211_frame *);
if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min))
goto bad;
if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
IEEE80211_FC0_VERSION_0)
goto bad;
switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) {
case IEEE80211_FC1_DIR_NODS:
case IEEE80211_FC1_DIR_FROMDS:
addr = wh->i_addr1;
break;
case IEEE80211_FC1_DIR_DSTODS:
case IEEE80211_FC1_DIR_TODS:
addr = wh->i_addr3;
break;
default:
goto bad;
}
ni = ieee80211_find_txnode(ic, addr);
if (ni == NULL)
ni = ieee80211_ref_node(ic->ic_bss);
if (ni == NULL) {
printf("%s: no node for dst %s, "
"discard raw tx frame\n", ifp->if_xname,
ether_sprintf(addr));
ic->ic_stats.is_tx_nonode++;
goto bad;
}
ni->ni_inact = 0;
*pni = ni;
return (m);
}
fallback:
if (m->m_len < sizeof(struct ether_header)) {
m = m_pullup(m, sizeof(struct ether_header));
if (m == NULL) {
ic->ic_stats.is_tx_nombuf++;
goto bad;
}
}
memcpy(&eh, mtod(m, caddr_t), sizeof(struct ether_header));
ni = ieee80211_find_txnode(ic, eh.ether_dhost);
if (ni == NULL) {
IEEE80211_DPRINTF(("%s: no node for dst %s, discard frame\n",
__func__, ether_sprintf(eh.ether_dhost)));
ic->ic_stats.is_tx_nonode++;
goto bad;
}
ni->ni_inact = 0;
m_adj(m, sizeof(struct ether_header) - sizeof(struct llc));
llc = mtod(m, struct llc *);
llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
llc->llc_control = LLC_UI;
llc->llc_snap.org_code[0] = 0;
llc->llc_snap.org_code[1] = 0;
llc->llc_snap.org_code[2] = 0;
llc->llc_snap.ether_type = eh.ether_type;
M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT);
if (m == NULL) {
ic->ic_stats.is_tx_nombuf++;
goto bad;
}
wh = mtod(m, struct ieee80211_frame *);
wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA;
*(u_int16_t *)&wh->i_dur[0] = 0;
*(u_int16_t *)&wh->i_seq[0] =
htole16(ni->ni_txseq << IEEE80211_SEQ_SEQ_SHIFT);
ni->ni_txseq++;
switch (ic->ic_opmode) {
case IEEE80211_M_STA:
wh->i_fc[1] = IEEE80211_FC1_DIR_TODS;
IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid);
IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost);
IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost);
break;
case IEEE80211_M_IBSS:
case IEEE80211_M_AHDEMO:
wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost);
IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost);
IEEE80211_ADDR_COPY(wh->i_addr3, ic->ic_bss->ni_bssid);
break;
case IEEE80211_M_HOSTAP:
wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost);
IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid);
IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost);
break;
case IEEE80211_M_MONITOR:
goto bad;
}
if (ic->ic_flags & IEEE80211_F_WEPON)
wh->i_fc[1] |= IEEE80211_FC1_WEP;
*pni = ni;
return m;
bad:
if (m != NULL)
m_freem(m);
if (ni != NULL)
ieee80211_release_node(ic, ni);
*pni = NULL;
return NULL;
}
/*
* Add a supported rates element id to a frame.
*/
u_int8_t *
ieee80211_add_rates(u_int8_t *frm, const struct ieee80211_rateset *rs)
{
int nrates;
*frm++ = IEEE80211_ELEMID_RATES;
nrates = rs->rs_nrates;
if (nrates > IEEE80211_RATE_SIZE)
nrates = IEEE80211_RATE_SIZE;
*frm++ = nrates;
memcpy(frm, rs->rs_rates, nrates);
return frm + nrates;
}
/*
* Add an extended supported rates element id to a frame.
*/
u_int8_t *
ieee80211_add_xrates(u_int8_t *frm, const struct ieee80211_rateset *rs)
{
/*
* Add an extended supported rates element if operating in 11g mode.
*/
if (rs->rs_nrates > IEEE80211_RATE_SIZE) {
int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE;
*frm++ = IEEE80211_ELEMID_XRATES;
*frm++ = nrates;
memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates);
frm += nrates;
}
return frm;
}
/*
* Add an ssid element to a frame.
*/
u_int8_t *
ieee80211_add_ssid(u_int8_t *frm, const u_int8_t *ssid, u_int len)
{
*frm++ = IEEE80211_ELEMID_SSID;
*frm++ = len;
memcpy(frm, ssid, len);
return frm + len;
}
/*
* Add an ERP element to a frame.
*/
u_int8_t *
ieee80211_add_erp(u_int8_t *frm, struct ieee80211com *ic)
{
u_int8_t erp;
*frm++ = IEEE80211_ELEMID_ERP;
*frm++ = 1;
erp = 0;
/*
* The NonERP_Present bit shall be set to 1 when a NonERP STA
* is associated with the BSS.
*/
if (ic->ic_nonerpsta != 0)
erp |= IEEE80211_ERP_NON_ERP_PRESENT;
/*
* If one or more NonERP STAs are associated in the BSS, the
* Use_Protection bit shall be set to 1 in transmitted ERP
* Information Elements.
*/
if (ic->ic_flags & IEEE80211_F_USEPROT)
erp |= IEEE80211_ERP_USE_PROTECTION;
/*
* The Barker_Preamble_Mode bit shall be set to 1 by the ERP
* Information Element sender if one or more associated NonERP
* STAs are not short preamble capable.
*/
if (!(ic->ic_flags & IEEE80211_F_SHPREAMBLE))
erp |= IEEE80211_ERP_BARKER_MODE;
*frm++ = erp;
return frm;
}
struct mbuf *
ieee80211_getmbuf(int flags, int type, u_int pktlen)
{
struct mbuf *m;
/* account for 802.11 header */
pktlen += sizeof(struct ieee80211_frame);
if (pktlen > MCLBYTES)
panic("802.11 packet too large: %u", pktlen);
MGETHDR(m, flags, type);
if (m != NULL && pktlen > MHLEN)
MCLGET(m, flags);
return m;
}
/*
* Send a management frame. The node is for the destination (or ic_bss
* when in station mode). Nodes other than ic_bss have their reference
* count bumped to reflect our use for an indeterminant time.
*/
int
ieee80211_send_mgmt(struct ieee80211com *ic, struct ieee80211_node *ni,
int type, int arg)
{
#define senderr(_x, _v) do { ic->ic_stats._v++; ret = _x; goto bad; } while (0)
struct ifnet *ifp = &ic->ic_if;
struct mbuf *m;
u_int8_t *frm;
enum ieee80211_phymode mode;
u_int16_t capinfo;
int has_challenge, is_shared_key, ret, timer, status;
if (ni == NULL)
panic("null node");
/*
* Hold a reference on the node so it doesn't go away until after
* the xmit is complete all the way in the driver. On error we
* will remove our reference.
*/
ieee80211_ref_node(ni);
timer = 0;
switch (type) {
case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
/*
* probe request frame format
* [tlv] ssid
* [tlv] supported rates
* [tlv] extended supported rates
*/
m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA,
2 + ic->ic_des_esslen +
2 + IEEE80211_RATE_SIZE +
2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE));
if (m == NULL)
senderr(ENOMEM, is_tx_nombuf);
m->m_data += sizeof(struct ieee80211_frame);
frm = mtod(m, u_int8_t *);
frm = ieee80211_add_ssid(frm, ic->ic_des_essid,
ic->ic_des_esslen);
mode = ieee80211_chan2mode(ic, ni->ni_chan);
frm = ieee80211_add_rates(frm, &ic->ic_sup_rates[mode]);
frm = ieee80211_add_xrates(frm, &ic->ic_sup_rates[mode]);
m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *);
timer = IEEE80211_TRANS_WAIT;
break;
case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
/*
* probe response frame format
* [8] time stamp
* [2] beacon interval
* [2] cabability information
* [tlv] ssid
* [tlv] supported rates
* [tlv] parameter set (FH/DS)
* [tlv] parameter set (IBSS)
* [tlv] extended rate phy (ERP)
* [tlv] extended supported rates
*/
m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA,
8 + /* time stamp */
2 + /* beacon interval */
2 + /* cabability information */
2 + ni->ni_esslen + /* ssid */
2 + IEEE80211_RATE_SIZE + /* supported rates */
7 + /* parameter set (FH/DS) */
6 + /* parameter set (IBSS) */
2 + 1 + /* extended rate phy (ERP) */
2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE));
if (m == NULL)
senderr(ENOMEM, is_tx_nombuf);
m->m_data += sizeof(struct ieee80211_frame);
frm = mtod(m, u_int8_t *);
memset(frm, 0, 8); /* timestamp should be filled later */
frm += 8;
*(u_int16_t *)frm = htole16(ic->ic_bss->ni_intval);
frm += 2;
if (ic->ic_opmode == IEEE80211_M_IBSS)
capinfo = IEEE80211_CAPINFO_IBSS;
else
capinfo = IEEE80211_CAPINFO_ESS;
if (ic->ic_flags & IEEE80211_F_WEPON)
capinfo |= IEEE80211_CAPINFO_PRIVACY;
if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
IEEE80211_IS_CHAN_2GHZ(ni->ni_chan))
capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE;
if (ic->ic_flags & IEEE80211_F_SHSLOT)
capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME;
*(u_int16_t *)frm = htole16(capinfo);
frm += 2;
frm = ieee80211_add_ssid(frm, ic->ic_bss->ni_essid,
ic->ic_bss->ni_esslen);
frm = ieee80211_add_rates(frm, &ic->ic_bss->ni_rates);
if (ic->ic_phytype == IEEE80211_T_FH) {
*frm++ = IEEE80211_ELEMID_FHPARMS;
*frm++ = 5;
*frm++ = ni->ni_fhdwell & 0x00ff;
*frm++ = (ni->ni_fhdwell >> 8) & 0x00ff;
*frm++ = IEEE80211_FH_CHANSET(
ieee80211_chan2ieee(ic, ni->ni_chan));
*frm++ = IEEE80211_FH_CHANPAT(
ieee80211_chan2ieee(ic, ni->ni_chan));
*frm++ = ni->ni_fhindex;
} else {
*frm++ = IEEE80211_ELEMID_DSPARMS;
*frm++ = 1;
*frm++ = ieee80211_chan2ieee(ic, ni->ni_chan);
}
if (ic->ic_opmode == IEEE80211_M_IBSS) {
*frm++ = IEEE80211_ELEMID_IBSSPARMS;
*frm++ = 2;
*frm++ = 0; *frm++ = 0; /* TODO: ATIM window */
} else { /* IEEE80211_M_HOSTAP */
/* TODO: TIM */
*frm++ = IEEE80211_ELEMID_TIM;
*frm++ = 4; /* length */
*frm++ = 0; /* DTIM count */
*frm++ = 1; /* DTIM period */
*frm++ = 0; /* bitmap control */
*frm++ = 0; /* Partial Virtual Bitmap (variable) */
}
if (ic->ic_curmode == IEEE80211_MODE_11G)
frm = ieee80211_add_erp(frm, ic);
frm = ieee80211_add_xrates(frm, &ic->ic_bss->ni_rates);
m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *);
break;
case IEEE80211_FC0_SUBTYPE_AUTH:
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == NULL)
senderr(ENOMEM, is_tx_nombuf);
status = arg >> 16;
arg &= 0xffff;
has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE ||
arg == IEEE80211_AUTH_SHARED_RESPONSE) &&
ni->ni_challenge != NULL);
is_shared_key = has_challenge || (ni->ni_challenge != NULL &&
arg == IEEE80211_AUTH_SHARED_PASS);
if (has_challenge && status == IEEE80211_STATUS_SUCCESS) {
MH_ALIGN(m, 2 * 3 + 2 + IEEE80211_CHALLENGE_LEN);
m->m_pkthdr.len = m->m_len =
2 * 3 + 2 + IEEE80211_CHALLENGE_LEN;
} else {
MH_ALIGN(m, 2 * 3);
m->m_pkthdr.len = m->m_len = 2 * 3;
}
frm = mtod(m, u_int8_t *);
((u_int16_t *)frm)[0] =
(is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) :
htole16(IEEE80211_AUTH_ALG_OPEN);
((u_int16_t *)frm)[1] = htole16(arg); /* sequence number */
((u_int16_t *)frm)[2] = htole16(status);/* status */
if (has_challenge && status == IEEE80211_STATUS_SUCCESS) {
((u_int16_t *)frm)[3] =
htole16((IEEE80211_CHALLENGE_LEN << 8) |
IEEE80211_ELEMID_CHALLENGE);
memcpy(&((u_int16_t *)frm)[4], ni->ni_challenge,
IEEE80211_CHALLENGE_LEN);
if (arg == IEEE80211_AUTH_SHARED_RESPONSE) {
IEEE80211_DPRINTF((
"%s: request encrypt frame\n", __func__));
m->m_flags |= M_LINK0; /* WEP-encrypt, please */
}
}
if (ic->ic_opmode == IEEE80211_M_STA)
timer = IEEE80211_TRANS_WAIT;
break;
case IEEE80211_FC0_SUBTYPE_DEAUTH:
if (ifp->if_flags & IFF_DEBUG)
printf("%s: station %s deauthenticate (reason %d)\n",
ifp->if_xname, ether_sprintf(ni->ni_macaddr), arg);
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == NULL)
senderr(ENOMEM, is_tx_nombuf);
MH_ALIGN(m, 2);
m->m_pkthdr.len = m->m_len = 2;
*mtod(m, u_int16_t *) = htole16(arg); /* reason */
break;
case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
/*
* association request frame format
* [2] capability information
* [2] listen interval
* [6*] current AP address (reassoc only)
* [tlv] ssid
* [tlv] supported rates
* [tlv] extended supported rates
*/
m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA,
2 + /* capability information */
2 + /* listen interval */
IEEE80211_ADDR_LEN + /* current AP address */
2 + ni->ni_esslen + /* ssid */
2 + IEEE80211_RATE_SIZE + /* supported rates */
2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE));
if (m == NULL)
senderr(ENOMEM, is_tx_nombuf);
m->m_data += sizeof(struct ieee80211_frame);
frm = mtod(m, u_int8_t *);
capinfo = 0;
if (ic->ic_opmode == IEEE80211_M_IBSS)
capinfo |= IEEE80211_CAPINFO_IBSS;
else /* IEEE80211_M_STA */
capinfo |= IEEE80211_CAPINFO_ESS;
if (ic->ic_flags & IEEE80211_F_WEPON)
capinfo |= IEEE80211_CAPINFO_PRIVACY;
/*
* NB: Some 11a AP's reject the request when
* short preamble is set.
*/
if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
IEEE80211_IS_CHAN_2GHZ(ni->ni_chan))
capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE;
if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) &&
(ic->ic_flags & IEEE80211_F_SHSLOT))
capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME;
*(u_int16_t *)frm = htole16(capinfo);
frm += 2;
*(u_int16_t *)frm = htole16(ic->ic_lintval);
frm += 2;
if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
IEEE80211_ADDR_COPY(frm, ic->ic_bss->ni_bssid);
frm += IEEE80211_ADDR_LEN;
}
frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen);
frm = ieee80211_add_rates(frm, &ni->ni_rates);
frm = ieee80211_add_xrates(frm, &ni->ni_rates);
m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *);
timer = IEEE80211_TRANS_WAIT;
break;
case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
/*
* association response frame format
* [2] capability information
* [2] status
* [2] association ID
* [tlv] supported rates
* [tlv] extended supported rates
*/
m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA,
2 + /* capability information */
2 + /* status */
2 + /* association ID */
2 + IEEE80211_RATE_SIZE + /* supported rates */
2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE));
if (m == NULL)
senderr(ENOMEM, is_tx_nombuf);
m->m_data += sizeof(struct ieee80211_frame);
frm = mtod(m, u_int8_t *);
capinfo = IEEE80211_CAPINFO_ESS;
if (ic->ic_flags & IEEE80211_F_WEPON)
capinfo |= IEEE80211_CAPINFO_PRIVACY;
if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
IEEE80211_IS_CHAN_2GHZ(ni->ni_chan))
capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE;
if (ic->ic_flags & IEEE80211_F_SHSLOT)
capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME;
*(u_int16_t *)frm = htole16(capinfo);
frm += 2;
*(u_int16_t *)frm = htole16(arg); /* status */
frm += 2;
if (arg == IEEE80211_STATUS_SUCCESS)
*(u_int16_t *)frm = htole16(ni->ni_associd);
frm += 2;
frm = ieee80211_add_rates(frm, &ni->ni_rates);
frm = ieee80211_add_xrates(frm, &ni->ni_rates);
m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *);
break;
case IEEE80211_FC0_SUBTYPE_DISASSOC:
if (ifp->if_flags & IFF_DEBUG)
printf("%s: station %s disassociate (reason %d)\n",
ifp->if_xname, ether_sprintf(ni->ni_macaddr), arg);
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == NULL)
senderr(ENOMEM, is_tx_nombuf);
MH_ALIGN(m, 2);
m->m_pkthdr.len = m->m_len = 2;
*mtod(m, u_int16_t *) = htole16(arg); /* reason */
break;
default:
IEEE80211_DPRINTF(("%s: invalid mgmt frame type %u\n",
__func__, type));
senderr(EINVAL, is_tx_unknownmgt);
/* NOTREACHED */
}
ret = ieee80211_mgmt_output(ifp, ni, m, type);
if (ret == 0) {
if (timer)
ic->ic_mgt_timer = timer;
} else {
bad:
ieee80211_release_node(ic, ni);
}
return ret;
#undef senderr
}
/*
* Build a RTS (Request To Send) control frame.
*/
struct mbuf *
ieee80211_get_rts(struct ieee80211com *ic, const struct ieee80211_frame *wh,
u_int16_t dur)
{
struct ieee80211_frame_rts *rts;
struct mbuf *m;
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == NULL) {
ic->ic_stats.is_tx_nombuf++;
return NULL;
}
m->m_pkthdr.len = m->m_len = sizeof (struct ieee80211_frame_rts);
rts = mtod(m, struct ieee80211_frame_rts *);
rts->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_CTL |
IEEE80211_FC0_SUBTYPE_RTS;
rts->i_fc[1] = IEEE80211_FC1_DIR_NODS;
*(u_int16_t *)rts->i_dur = htole16(dur);
IEEE80211_ADDR_COPY(rts->i_ra, wh->i_addr1);
IEEE80211_ADDR_COPY(rts->i_ta, wh->i_addr2);
return m;
}
/*
* Build a CTS-to-self (Clear To Send) control frame.
*/
struct mbuf *
ieee80211_get_cts_to_self(struct ieee80211com *ic, u_int16_t dur)
{
struct ieee80211_frame_cts *cts;
struct mbuf *m;
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == NULL) {
ic->ic_stats.is_tx_nombuf++;
return NULL;
}
m->m_pkthdr.len = m->m_len = sizeof (struct ieee80211_frame_cts);
cts = mtod(m, struct ieee80211_frame_cts *);
cts->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_CTL |
IEEE80211_FC0_SUBTYPE_CTS;
cts->i_fc[1] = IEEE80211_FC1_DIR_NODS;
*(u_int16_t *)cts->i_dur = htole16(dur);
IEEE80211_ADDR_COPY(cts->i_ra, ic->ic_myaddr);
return m;
}
struct mbuf *
ieee80211_beacon_alloc(struct ieee80211com *ic, struct ieee80211_node *ni)
{
struct ieee80211_frame *wh;
struct mbuf *m;
u_int8_t *frm;
u_int16_t capinfo;
struct ieee80211_rateset *rs;
/*
* beacon frame format
* [8] time stamp
* [2] beacon interval
* [2] cabability information
* [tlv] ssid
* [tlv] supported rates
* [3] parameter set (DS)
* [tlv] parameter set (IBSS/TIM)
* [tlv] extended rate phy (ERP)
* [tlv] extended supported rates
*/
m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA,
8 + /* time stamp */
2 + /* beacon interval */
2 + /* cabability information */
2 + ni->ni_esslen + /* ssid */
2 + IEEE80211_RATE_SIZE + /* supported rates */
2 + 1 + /* parameter set (DS) */
6 + /* parameter set (IBSS/TIM) */
2 + 1 + /* extended rate phy (ERP) */
2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE));
if (m == NULL)
return NULL;
wh = mtod(m, struct ieee80211_frame *);
wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT |
IEEE80211_FC0_SUBTYPE_BEACON;
wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
*(u_int16_t *)wh->i_dur = 0;
IEEE80211_ADDR_COPY(wh->i_addr1, etherbroadcastaddr);
IEEE80211_ADDR_COPY(wh->i_addr2, ic->ic_myaddr);
IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid);
*(u_int16_t *)wh->i_seq = 0;
frm = (u_int8_t *)&wh[1];
bzero(frm, 8); /* timestamp is set by hardware */
frm += 8;
*(u_int16_t *)frm = htole16(ni->ni_intval);
frm += 2;
if (ic->ic_opmode == IEEE80211_M_IBSS) {
capinfo = IEEE80211_CAPINFO_IBSS;
} else {
capinfo = IEEE80211_CAPINFO_ESS;
}
if (ic->ic_flags & IEEE80211_F_WEPON)
capinfo |= IEEE80211_CAPINFO_PRIVACY;
if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
IEEE80211_IS_CHAN_2GHZ(ni->ni_chan))
capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE;
if (ic->ic_flags & IEEE80211_F_SHSLOT)
capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME;
*(u_int16_t *)frm = htole16(capinfo);
frm += 2;
if (ic->ic_flags & IEEE80211_F_HIDENWID)
*frm++ = 0;
else
frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen);
rs = &ni->ni_rates;
frm = ieee80211_add_rates(frm, rs);
*frm++ = IEEE80211_ELEMID_DSPARMS;
*frm++ = 1;
*frm++ = ieee80211_chan2ieee(ic, ni->ni_chan);
if (ic->ic_opmode == IEEE80211_M_IBSS) {
*frm++ = IEEE80211_ELEMID_IBSSPARMS;
*frm++ = 2;
*frm++ = 0; *frm++ = 0; /* TODO: ATIM window */
} else {
/* TODO: TIM */
*frm++ = IEEE80211_ELEMID_TIM;
*frm++ = 4; /* length */
*frm++ = 0; /* DTIM count */
*frm++ = 1; /* DTIM period */
*frm++ = 0; /* bitmap control */
*frm++ = 0; /* Partial Virtual Bitmap (variable length) */
}
if (ic->ic_curmode == IEEE80211_MODE_11G)
frm = ieee80211_add_erp(frm, ic);
frm = ieee80211_add_xrates(frm, rs);
m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *);
m->m_pkthdr.rcvif = (void *)ni;
return m;
}
void
ieee80211_pwrsave(struct ieee80211com *ic, struct ieee80211_node *ni,
struct mbuf *m)
{
/* Store the new packet on our queue, changing the TIM if necessary */
if (IF_IS_EMPTY(&ni->ni_savedq)) {
ic->ic_set_tim(ic, ni->ni_associd, 1);
}
if (ni->ni_savedq.ifq_len >= IEEE80211_PS_MAX_QUEUE) {
IF_DROP(&ni->ni_savedq);
m_freem(m);
if (ic->ic_if.if_flags & IFF_DEBUG)
printf("%s: station %s power save queue overflow"
" of size %d drops %d\n",
ic->ic_if.if_xname,
ether_sprintf(ni->ni_macaddr),
IEEE80211_PS_MAX_QUEUE,
ni->ni_savedq.ifq_drops);
} else {
/* Similar to ieee80211_mgmt_output, store the node in
* the rcvif field.
*/
IF_ENQUEUE(&ni->ni_savedq, m);
m->m_pkthdr.rcvif = (void *)ni;
}
}
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